Flange Floating Ball Valve | DN15-200 RF/RTJ Fire-Safe Factory

A Flange Floating Ball Valve is a quarter-turn ball valve with a floating ball design and flanged ends (RF/RTJ) - the ball is not fixed to a trunnion but is held between two valve seats; under medium pressure, the ball automatically shifts toward the downstream seat, pressing tightly to form a bidirectional self-sealing (leakage ≤1×10⁻¹⁰ m³/s, API 598 Class IV) - with RF/RTJ flanged connection (ASME B16.5/EN 1092-1/DIN 2501) for easy install/removal, full-bore low flow resistance (resistance coefficient ≤0.8, 40% less pressure loss than globe valves), mirror-polished ball (Ra ≤0.8μm, anti-deposition), ultra-wide temperature -196~550°C (cryogenic LNG to high-temp), WCB/304(CF8)/316(CF8M)/alloy steel body, PTFE/RPTFE/PEEK/Inconel metal hard seal seats, blow-out proof stem (ASME B16.34), double anti-static, fire-safe API 6FA/607 optional, manual (lockable lever)/pneumatic (5s)/electric (≤15s), two-piece split body for online maintenance - a reliable, safe, fire-safe, floating-ball flanged ball valve for global industrial pipelines. The core highlights are: (a) Floating ball bidirectional self-sealing: ball not fixed at trunnion, floats between seats; under upstream pressure, ball pushed against downstream seat - seat deforms/conforms, forms tight seal; bidirectional (seals in both flow directions); leakage ≤1×10⁻¹⁰ m³/s (API 598 Class IV - very tight); self-sealing = sealing force increases with pressure (higher pressure = tighter seal); unlike trunnion ball (fixed, pressure to bearings), floating ball uses pressure for sealing - simple, reliable, cost-effective for small/medium DN; (b) Flanged RF/RTJ connection: RF (Raised Face) - standard flange with raised face, gasket between flanges, most common, easy install/remove; RTJ (Ring Type Joint) - metal ring gasket in groove, for high pressure (Class 600+), high temp, critical service; flanged = bolted to pipeline flange, easy disassembly for maintenance (vs welded = permanent); conforms to ASME B16.5/EN 1092-1/DIN 2501 - global compatibility; (c) Full-bore low flow resistance: ball bore = pipe ID, unobstructed flow; resistance coefficient ≤0.8 (very low); 40% less pressure loss than globe valves (globe has S-shaped tortuous path, ball has straight-through); saves pumping energy (~15,000 kWh/year for industrial systems per page); suitable for viscous media, trace particles (mirror-polished ball prevents deposition); (d) Mirror-polished ball: ball surface Ra ≤0.8μm - smooth, reduces friction/wear, prevents medium deposition/scaling, improves sealing (soft seat conforms better), suitable for fluids with trace particles; (e) Ultra-wide temperature -196~550°C: covers cryogenic (-196°C LNG/LOX/LIN) to high-temp (550°C steam/hot oil) - depends on seat/body material (PTFE ≤180, PEEK ≤250, Inconel metal >550, cryogenic body 316L/LCB); standard -40~220°C; wide temp adaptability; (f) High-strength material system: body WCB (carbon steel, general), 304/CF8 (stainless, corrosion), 316/CF8M (stainless, better corrosion/chloride), alloy steel (high-temp/pressure); ball/stem 304/316 stainless; seats PTFE (general), RPTFE (reinforced PTFE, better wear), PEEK (high-temp/strong), Inconel metal hard seal (high-temp/wear/fire-safe); (g) Safe & reliable design: blow-out proof stem (enlarged shoulder, ASME B16.34 - stem cannot eject under pressure); double anti-static (spring conducts ball-stem-body, prevents static spark for flammable); fire-safe API 6FA/607 optional (soft seat burns, metal backup + graphite maintains seal in fire); (h) Flexible operation: manual (rugged light lever, locking device at full open/close - prevents misoperation/vibration-induced switching); pneumatic (5s quick shut-off, remote, ATEX optional); electric (≤15s response, remote/DCS, 4-20mA optional, manual backup); (i) Easy maintenance: two-piece or split body - body halves bolted, can disassemble to replace seats/ball without removing from pipeline (online maintenance); reduces downtime/labor; (j) Wide size/pressure: DN15-200 (1/2"-8"), PN16-100 (1.6-10MPa) - small to medium, low to high pressure; (k) Compliance: API 6D, API 608, ASME B16.34, API 598; (l) Applicable media: oil, gas, condensate, corrosive chemicals, organic solvents, chemical reagents, steam, water, trace-particle fluids; (m) Applications: petroleum & natural gas (exploration, refining, transmission), chemical (corrosive, solvents, reagents), power generation (thermal/nuclear/hydro - steam, water, boiler, cooling), water treatment & urban construction (supply/drainage, sewage, building water), metallurgy/food/pharma/marine. This is the reliable floating-ball flanged fire-safe ball valve solution for global industrial pipelines.

The floating-ball self-sealing principle, flanged RF/RTJ connection, full-bore low resistance, ultra-wide temperature, fire-safe/anti-static/blow-out proof safety, and two-piece online maintenance make this valve a reliable, safe, general-purpose floating-ball flanged ball valve suitable for a broad range of industrial applications - from oil & gas and chemical to power, water treatment, and general industrial - with manual or automated operation and fire-safe/anti-static safety features for hazardous environments. Compared to other ball valves in the series: (a) vs. Fixed Ball Valve (Trunnion): that one is trunnion-mounted fixed ball + DBB (Double Block & Bleed) + high-pressure large-bore DN1400 + emergency grease injection + extended bonnet for buried; this one is floating ball (not trunnion) + bidirectional self-sealing + DN15-200 small/medium + flanged RF/RTJ + fire-safe/anti-static + standard temp - floating vs fixed is the core distinction; (b) vs. Pneumatic Flange Ball Valve: that one is WCB/stainless + pneumatic actuator + flange + fire-safe/anti-static/auto cavity relief + DN10-1000 large + ultra-wide temp customizable; this one is floating ball + flange + manual primary (pneumatic/electric optional) + DN15-200 + PN16-100 + bidirectional self-sealing + ultra-wide -196~550°C - floating-ball specific; (c) vs. Stainless Steel Ball Valve: that one is all-stainless (304/316/316L) + DN8-250 + 1/2/3-piece + multiple connections (thread/flange/SW/BW/Tri-Clamp) + hygienic + EN 10204-3.1; this one is WCB/stainless/alloy + flanged RF/RTJ only + floating ball + bidirectional self-sealing + fire-safe/anti-static + -196~550°C - not all-stainless, not hygienic, floating-ball flanged specific; (d) vs. Wide Flange Ball Valve: that one is wide flange (larger diameter, more bolts) + DN15-900 + floating/trunnion optional; this one is standard flange RF/RTJ + floating ball + DN15-200 + bidirectional self-sealing + fire-safe - standard flange vs wide flange; (e) vs. Integral Flange Insulated Ball Valve: that one is integral flange + insulation jacket (steam/hot oil circulation); this one is standard flange + floating ball + no insulation - non-insulated; (f) vs. Three-piece Flange Ball Valve: that one is 3-piece (center removable online) + flange + DN15-250 + PN16/40/63; this one is 2-piece split + floating ball + RF/RTJ + fire-safe/anti-static + -196~550°C - 2-piece floating vs 3-piece; (g) vs. Forged Steel Ball Valve: that one is forged steel body + API 602 small-bore + NPS 1/4"-4" + Class150-2500 + multiple small connections; this one is cast WCB/stainless + flanged + DN15-200 + floating ball + fire-safe - cast flanged floating vs forged small-bore. Floating ball vs trunnion ball explained: (a) Floating ball (this valve): ball is not fixed at bottom, sits between two seats, can "float" (shift slightly); under upstream pressure, ball is pushed downstream against downstream seat - seat compresses, forms seal; sealing force comes from medium pressure (self-sealing, higher pressure = tighter); simple, fewer parts, cost-effective; limitation: for large DN/high pressure, ball weight + high pressure = high torque, seat wear; best for DN ≤200, PN ≤100 (this valve's range); (b) Trunnion ball: ball has top and bottom trunnions (shafts) fixed in body, ball cannot shift; pressure goes to bearings (not seat); lower torque for large/high pressure; DBB (Double Block & Bleed) possible (both seats seal + cavity bleed); more complex, more expensive; for DN >200, high pressure; (c) this valve = floating ball - optimal for its DN15-200/PN16-100 range. Bidirectional self-sealing explained: (a) floating ball seals in both flow directions (upstream and downstream); (b) when flow from A→B, pressure pushes ball against B seat → B seat seals; (c) when flow reversed B→A, pressure pushes ball against A seat → A seat seals; (d) self-sealing = no external spring/force needed (though springs may assist initial seal); (e) leakage ≤1×10⁻¹⁰ m³/s (very tight - API 598 Class IV, suitable for flammable/toxic); (f) unlike some valves that seal only one direction (unidirectional), floating ball is bidirectional. RF vs RTJ flange: (a) RF (Raised Face): flange face has raised ring (1-2mm), gasket (spiral wound, PTFE, rubber) sits on raised face, compressed by bolts; most common, for Class 150-300 (low/medium pressure), easy/cheap; (b) RTJ (Ring Type Joint): flange has groove, metal ring (oval/octagonal, soft iron/304/316) sits in groove, compressed into groove - metal-to-metal seal; for high pressure Class 600+, high temp, critical service (oil/gas high-pressure); more expensive, requires precision machining; (c) this valve offers both - select based on pressure/temp. Full-bore energy saving: (a) full port = bore = pipe ID, straight-through flow; (b) resistance coefficient ≤0.8 (very low - globe valve ~3-10, gate ~0.1-0.3, ball ~0.5-1.0); (c) 40% less pressure loss than globe valves (globe has S-shaped path, high turbulence); (d) lower pressure loss = less pumping energy = cost savings (~15,000 kWh/year per page claim); (e) also suitable for viscous media, trace particles (no obstruction). Fire-safe principle (API 6FA/607): (a) in fire, soft PTFE/PEEK seat burns/melts; (b) metal backup seat/lip (Inconel/stainless) + graphite packing maintains metal-to-metal seal; (c) API 6FA = fire test for valves (30 min fire, 750-1000°C, then water cool, verify seal); (d) API 607 = fire test for quarter-turn valves (soft-seated); (e) this valve optional fire-safe (specify when ordering) - for flammable/hazardous. Anti-static principle: (a) ball rotating against PTFE seat generates static electricity (friction); (b) double anti-static = springs/contacts between (1) ball-stem, (2) stem-body - conducts static to ground (pipeline); (c) prevents static spark ignition of flammable gas/liquid; (d) required for flammable service (oil/gas, solvents); (e) this valve has double anti-static (standard). Blow-out proof stem: (a) stem has enlarged shoulder/collar inside body; (b) if packing fails, pressure pushes stem up - collar catches on body, stem cannot eject; (c) ASME B16.34 requirement; (d) safety (prevents stem ejection = major leak/hazard); (e) this valve compliant. Manual lever with lock: (a) lever handle for small DN (≤DN80-100); (b) locking device at full open and full close positions - pin/lock prevents accidental rotation (vibration, misoperation); (c) important for critical pipelines (isolation valves, safety); (d) this valve has lockable lever. Two-piece split body maintenance: (a) body = two halves bolted (with gasket); (b) to maintain: disconnect from pipeline? - 2-piece typically requires removing from pipeline to split (unlike 3-piece which can remove center with ends in line); (c) page says "two-piece or split body design allows for easy disassembly and maintenance without removing the entire valve from the pipeline" - this may be a 3-piece-like split or special design; (d) regardless, split body = easier than 1-piece (not serviceable); (e) seats/ball replaceable. Ultra-wide temperature -196~550°C: (a) -196°C = cryogenic (LNG, LOX, LIN) - requires cryogenic body (316L/LCB), extended bonnet, PTFE/Kel-F seat; (b) 550°C = high-temp (steam, hot oil) - requires alloy body, Inconel/metal seat, graphite packing; (c) standard -40~220°C (PTFE seat, WCB/stainless body); (d) wide range = material/seat dependent; (e) specify temp when ordering (we configure body/seat). Important notes: (a) on-off primary - not for continuous throttling (seat erosion); (b) floating ball torque increases with pressure/DN - for DN>200/PN>100 consider trunnion; (c) RTJ for high pressure (Class 600+), RF for low/medium; (d) fire-safe/anti-static for flammable (specify); (e) cryogenic <-40°C - extended bonnet, cryogenic material; (f) high temp >220°C - PEEK/Inconel/metal seat, graphite packing; (g) maintenance - exercise periodically, inspect seats, replace if worn; (h) flange gasket - match pressure/temp (spiral wound for high, PTFE for chemical, RTJ ring for RTJ). The valve is manufactured under strict quality control with 100% body hydrostatic (1.5×PN), 100% seat leak (1.1×PN, Class IV), 100% air tightness, anti-static continuity, blow-out proof stem, torque test, fire test (if specified), cryogenic test (if specified). With an 18-month warranty and OEM/ODM customization (material, size, pressure, flange RF/RTJ, seat, actuation, fire-safe, anti-static, cryogenic, high-temp), this valve is a reliable, safe, floating-ball flanged fire-safe ball valve for global industrial pipelines.

1.Floating Ball Bidirectional Self-Sealing

Ball not trunnion-fixed, floats between seats; under medium pressure, ball shifts toward downstream seat, compresses seat = bidirectional self-sealing (seals both directions). Leakage ≤1×10⁻¹⁰ m³/s (API 598 Class IV) - very tight, suitable for flammable/toxic media. Sealing force increases with pressure (higher pressure = tighter seal). Simple, reliable, cost-effective for DN15-200/PN16-100 range.

2.Flanged RF/RTJ + Full-Bore Low Resistance

Flanged ends RF (Raised Face, Class 150-300) or RTJ (Ring Type Joint, Class 600+ high pressure) - conforms to ASME B16.5/EN 1092-1/DIN 2501, global compatibility, easy install/removal. Full-bore design, resistance coefficient ≤0.8, 40% less pressure loss than globe valves (saves pumping energy). Mirror-polished ball Ra ≤0.8μm - anti-deposition, suitable for trace-particle fluids.

3.Ultra-Wide Temperature -196~550°C + Multi-Material

Ultra-wide temperature range -196°C (cryogenic LNG/LOX/LIN) to 550°C (high-temp steam/hot oil), standard -40~220°C. Body: WCB (carbon steel general), 304/CF8 (stainless corrosion), 316/CF8M (stainless better corrosion/chloride), alloy steel (high-temp/pressure). Ball/stem: 304/316 stainless. Seats: PTFE (general), RPTFE (reinforced wear), PEEK (high-temp strong), Inconel metal hard seal (high-temp/wear/fire-safe).

4.Safe Design: Blow-out Proof + Anti-Static + Fire-Safe

Blow-out proof stem (enlarged shoulder, ASME B16.34 compliant - stem cannot eject under pressure). Double anti-static devices (springs conduct ball-stem-body, prevents static spark for flammable). Fire-safe design optional (API 6FA/API 607 - soft seat burns, metal backup + graphite maintains seal in fire). Safe for flammable/explosive/hazardous environments.

5.Flexible Operation + Lockable Manual

Manual (rugged light lever with locking device at full open/full close - prevents misoperation/vibration-induced switching), pneumatic (5s quick shut-off, remote, ATEX optional), electric (≤15s response, remote/DCS, 4-20mA optional, manual backup). Meets diverse automation needs from simple manual to remote automated.

6.Two-Piece Split + Easy Maintenance + Compliance

Two-piece or split body design - easy disassembly for seat/ball replacement, reduces downtime and maintenance cost. DN15-200 (1/2"-8"), PN16-100 (1.6-10MPa). Designed/tested per API 6D, API 608, ASME B16.34, API 598. For oil/gas, chemical, power, water/municipal, metallurgy/food/pharma/marine. 18-month warranty, OEM/ODM customization.

A Flange Floating Ball Valve operates on the principle of a quarter-turn rotating floating ball inside a flanged body - the ball has a central through-bore and is not fixed to a trunnion (unlike trunnion ball valves); when the bore is aligned with the pipeline, the valve is open (medium flows straight through full-bore); when the ball is rotated 90°, the solid ball face blocks the pipeline, and under medium pressure the floating ball shifts toward the downstream seat, compressing the seat to form a bidirectional self-sealing (leakage ≤1×10⁻¹⁰ m³/s, API 598 Class IV) - with RF/RTJ flanged connection, full-bore low flow resistance, mirror-polished ball, ultra-wide temperature -196~550°C, WCB/stainless/alloy body, PTFE/RPTFE/PEEK/Inconel seats, blow-out proof stem, double anti-static, fire-safe optional, and manual/pneumatic/electric operation - a reliable, safe, floating-ball flanged ball valve for industrial pipelines. The valve consists of a flanged body (two-piece split, RF or RTJ ends), a floating ball (with central bore, not trunnion-fixed, sits between seats), valve seats (PTFE/RPTFE/PEEK/Inconel, upstream + downstream), a stem (blow-out proof, connects ball to operator, anti-static springs), packing (PTFE/graphite), body gasket (spiral wound/RTJ ring), and an operator (lockable lever/pneumatic/electric). Quarter-turn flow principle: (1) open: ball bore aligned with pipeline - medium flows straight through full-bore (low resistance ≤0.8); (2) closed: ball rotated 90° - solid ball face perpendicular to flow, blocks pipeline; (3) floating ball self-seal: under upstream pressure, ball is pushed downstream against downstream seat - seat compresses/conforms, forms tight seal; (4) bidirectional: flow reversed → ball pushed opposite → other seat seals; (5) quick-open characteristic - on-off valve, not for throttling; (6) 90° rotation = fast operation. Floating ball vs trunnion detailed: (a) Floating ball (this valve): ball has no bottom trunnion, can shift (float) slightly in body; under pressure, ball moves downstream, presses against downstream seat - seat absorbs pressure, creates seal; advantages: simple, fewer parts, lower cost, self-sealing (pressure = sealing force), bidirectional; disadvantages: for large DN/high pressure, ball weight + high pressure = high operating torque, seat wear/deformation; best for: DN ≤200, PN ≤100 (this valve's range - optimal match); (b) Trunnion ball: ball has top + bottom trunnions (shafts) fixed in body with bearings; ball cannot shift; pressure goes to bearings (not seat); advantages: low torque (even large/high pressure), DBB possible, better for large DN/high pressure; disadvantages: more complex, more parts, higher cost; for: DN >200, high pressure; (c) this valve = floating ball - correctly sized for its DN15-200/PN16-100 range. Bidirectional self-sealing detailed: (a) floating ball has two seats (upstream + downstream); (b) flow A→B: pressure P at A pushes ball → ball moves right → presses B seat → B seat compresses → seals; (c) flow B→A (reverse): pressure P at B pushes ball → ball moves left → presses A seat → A seat seals; (d) both directions seal = bidirectional; (e) self-sealing: no external spring needed for main seal (spring may assist low-pressure initial seal); medium pressure provides sealing force - higher pressure = tighter seal; (f) leakage ≤1×10⁻¹⁰ m³/s = very tight (API 598 Class IV - suitable for flammable/toxic, prevents cross-contamination); (g) unlike unidirectional valves (seal only one direction), floating ball is inherently bidirectional. RF vs RTJ flange detailed: (a) RF (Raised Face): flange face has raised ring (1-2mm height); gasket (spiral wound graphite, PTFE, rubber, compressed asbestos-free) sits on raised face; bolts compress gasket → seal; for: Class 150-300 (low/medium pressure), general service, easy/cheap; gasket types: spiral wound (high temp/pressure), PTFE (chemical), rubber (water/low temp); (b) RTJ (Ring Type Joint): flange has machined groove (oval or octagonal); metal ring (soft iron, low-carbon steel, 304, 316, Inconel) sits in groove; bolts compress ring → ring deforms into groove → metal-to-metal seal; for: Class 600+ (high pressure), high temp, critical oil/gas; advantages: very reliable high-pressure seal, no gasket blowout; disadvantages: more expensive, requires precision groove machining, ring replacement each disassembly; (c) this valve offers both RF and RTJ - select based on pressure class (RF for ≤Class300, RTJ for ≥Class600). Full-bore low resistance detailed: (a) full-bore: ball bore = pipe ID - flow path unobstructed, straight-through; (b) resistance coefficient ≤0.8: K factor (loss coefficient) very low - compare: globe valve K=3-10 (high, S-shaped path), gate K=0.1-0.3, ball K=0.5-1.0; (c) 40% less pressure loss than globe valves: globe has S-shaped tortuous path + high turbulence + disc obstruction; ball has straight-through + full bore; (d) energy saving: lower ΔP = less pump head = less electricity (~15,000 kWh/year per page for industrial systems); (e) viscous/trace-particle: full bore + smooth = no obstruction, suitable for viscous media, fluids with trace particles (mirror-polished ball prevents deposition); (f) reduced port not mentioned - this valve is full-bore (standard). Mirror-polished ball: (a) ball surface Ra ≤0.8μm (very smooth); (b) benefits: low friction (less torque, less seat wear), prevents medium deposition/scaling (smooth = no adhesion), improves soft-seat sealing (seat conforms to smooth ball = zero leakage), suitable for trace-particle fluids (particles don't stick); (c) polishing: grinding + lapping + passivation (stainless). Ultra-wide temperature -196~550°C detailed: (a) -196°C (cryogenic): LNG (liquefied natural gas, -162°C), LOX (liquid oxygen, -183°C), LIN (liquid nitrogen, -196°C); requires: cryogenic body (316L austenitic stainless, LCB low-temp carbon steel - not brittle at low temp), extended bonnet (keeps packing above frost line, prevents stem freezing), cryogenic seat (PTFE, Kel-F/PCTFE - low shrinkage), cryogenic test (LN2 seal + operation); (b) 550°C (high-temp): superheated steam, hot oil, hot gas; requires: alloy body (WC6/WC9/F11/F22 chrome-moly), Inconel/Stellite metal seat (doesn't melt), graphite packing (high temp), fire-safe; (c) standard -40~220°C: WCB/stainless body + PTFE seat (≤180°C) or PEEK (≤250°C); (d) wide range = material/seat dependent - specify operating temp, we configure; (e) this valve's range is broader than typical ball valve (usually -29~200°C) - due to material/seat options. Seat materials detailed: (a) PTFE: general, ≤180°C, zero leakage, chemical-resistant; (b) RPTFE (Reinforced/Glass-filled PTFE): PTFE + glass fiber - better wear, less cold flow, higher temp; (c) PEEK: high strength, ≤250°C, good chemical, high pressure; (d) Inconel metal hard seal: nickel-chromium alloy - high temp (>550°C), wear, fire-safe, but higher leakage (not zero); (e) select based on temp/medium/pressure. Blow-out proof stem detailed: (a) stem has enlarged shoulder/collar below packing, inside body; (b) if packing fails, internal pressure pushes stem upward - collar catches on body internal shoulder → stem cannot blow out; (c) ASME B16.34 mandatory; (d) safety (stem ejection = catastrophic leak, injury hazard); (e) this valve compliant. Double anti-static detailed: (a) ball rotating against PTFE = triboelectric static (friction generates charge); (b) static can spark = ignition of flammable gas/vapor; (c) anti-static spring/contact 1: ball → stem (conductive path); (d) anti-static spring/contact 2: stem → body (conductive path); (e) body → pipeline flange → ground; (f) double = two paths (redundant, more reliable); (g) for flammable service (oil/gas, solvents); (h) this valve standard. Fire-safe (API 6FA/607) detailed: (a) API 607: fire test for soft-seated quarter-turn valves (ball, plug, butterfly) - valve exposed to fire (750-1000°C) for 30 min, then water-cooled, verify external leakage ≤ specified; (b) API 6FA: fire test for valves (broader, includes metal-seated); (c) mechanism: soft PTFE/PEEK seat burns/melts in fire; metal backup seat/lip (Inconel/stainless) + graphite packing (doesn't burn) maintains metal-to-metal seal (higher leakage but prevents catastrophic release); (d) this valve optional (specify) - for flammable/hazardous; (e) fire-safe valves have metal backup seat designed into body. Manual lever with lock detailed: (a) lever handle: for small DN (≤DN80-100), direct 90° rotation, simple, no power; (b) locking device: at full open (lever parallel to pipe) and full close (lever perpendicular), there is a hole/pin - insert lock/padlock → lever cannot rotate; (c) purpose: prevents accidental operation (vibration, unauthorized, misoperation) - critical for isolation valves; (d) OSHA/LOTO (Lockout/Tagout) compliant; (e) this valve has lockable lever. Pneumatic/electric operation: (a) pneumatic: rack-pinion or scotch-yoke actuator, compressed air (4-8 bar), 5s quick shut-off (fast for ESD emergency), remote, ATEX optional, spring-return fail-safe optional; (b) electric: motor+gear, ≤15s response, remote/DCS, 4-20mA modulating optional, manual handwheel backup (power failure), torque protection, IP65/IP67; (c) both rotate ball 90° via stem. Two-piece split body maintenance: (a) body = two halves (left + right) bolted with body gasket; (b) disassembly: unbolt body bolts, separate halves, remove ball/seats/stem; (c) replace: seats (if worn), ball (if scratched), packing, gasket; (d) reassemble: torque bolts in sequence; (e) vs 1-piece: 1-piece cannot be disassembled (replace valve); (f) vs 3-piece: 3-piece can remove center with ends in pipeline (online); 2-piece typically requires removing from pipeline - but page claims "without removing entire valve" - may be special split design; (g) regardless, split = serviceable. Pressure testing: (1) body hydrostatic 1.5×PN - zero external leak; (2) seat leak 1.1×PN - ≤1×10⁻¹⁰ m³/s (Class IV); (3) air tightness; (4) anti-static continuity (resistance <10Ω); (5) blow-out proof (pull test); (6) torque test; (7) fire test (if specified, API 6FA/607); (8) cryogenic test (if specified, LN2). Operation: (1) open: rotate lever/actuator 90° → ball bore aligns → flow; (2) close: rotate 90° opposite → ball blocks + floating self-seal; (3) indication: lever position (parallel=open, perpendicular=closed) or actuator indicator; (4) lock: at full open/close, insert lock. Maintenance: (1) periodic exercise (full open/close) - prevents seat seizure; (2) inspect external leaks (flange, body bolts, stem); (3) tighten packing if stem leaks; (4) inspect flange gasket (replace if leaking); (5) replace seats if worn (split body); (6) RTJ ring - replace each disassembly (metal ring deforms); (7) anti-static - verify continuity periodically. Important: (a) on-off only - not throttling; (b) floating ball limit - DN>200/PN>100 → use trunnion; (c) RTJ for high pressure; (d) fire-safe/anti-static for flammable; (e) cryogenic/high-temp - specify for material/seat; (f) flange gasket - match pressure/temp; (g) exercise valve if idle long.

• Petroleum & Natural Gas Industry

Oil exploration, refining, natural gas transmission pipelines, storage terminals - cutting off and regulating oil, gas, condensate, hydrocarbon media. Floating ball bidirectional self-sealing (≤1×10⁻¹⁰ m³/s) for flammable/toxic; double anti-static + fire-safe API 6FA/607 optional for hazardous; RF/RTJ flange for high-pressure pipeline; WCB/alloy body for high pressure/temp. Reliable for oil & gas upstream/midstream/downstream.

• Chemical & Petrochemical Industry

Corrosive media, organic solvents, chemical reagents, acids, alkalis pipelines - 304(CF8)/316(CF8M) stainless body for corrosion; PTFE/RPTFE/PEEK seats for chemical compatibility; tight Class IV shut-off prevents cross-contamination; full-bore low resistance for viscous chemicals; manual lockable lever for process isolation. Reliable for chemical processing, petrochemical, corrosive medium pipelines.

• Power Generation Industry

Thermal power, nuclear power, hydropower plants - controlling steam, water, boiler feedwater, cooling water, auxiliary systems. Ultra-wide temp -196~550°C (high-temp steam with Inconel/metal seat, cryogenic with extended bonnet); WCB/alloy body for high pressure/temp; fire-safe/anti-static for safety; full-bore low resistance saves pumping energy. Reliable for power plant boiler/cooling/steam pipelines.

• Water Treatment & Municipal Construction

Water supply/drainage, sewage treatment, desalination, building water systems, urban heating - WCB/stainless body, PTFE seats, full-bore low resistance, flanged RF easy install/removal, manual lockable lever, cost-effective general-purpose. Reliable for municipal water, wastewater, building HVAC, urban infrastructure fluid control.

• Metallurgy + Food + Pharma + Marine Industry

Metallurgy (cooling water, process fluids), food & beverage (sanitary stainless optional), pharmaceutical (sterile fluids, full-bore no entrapment), marine & offshore (saltwater corrosion, 316/CF8M, fire-safe/anti-static for shipboard) - multi-material, wide temp, flanged, multiple actuation. Reliable for diverse industrial flow control. 18-month warranty, OEM/ODM.

Our Flange Floating Ball Valves are manufactured under an ISO 9001:2015 certified quality management system, with every valve undergoing rigorous inspection and testing at each production stage - because these floating-ball flanged ball valves are used for oil & gas, chemical, power, water treatment, and general industrial service where seal leakage, flange connection failure, static spark, fire vulnerability, or material non-conformance causes safety hazards, environmental incidents, process disruption, and costly downtime (floating-ball self-sealing, RF/RTJ flanged integrity, fire-safe/anti-static safety, and pressure/temp ratings require strict verification).

Raw material control: every body/ball/stem material batch comes with material certificate (chemical composition + mechanical properties: tensile, yield, elongation, hardness per heat); WCB/304(CF8)/316(CF8M)/alloy steel verified by PMI (Positive Material Identification) - verify Cr/Ni/Mo/C content (316 must have 2-3% Mo, WCB carbon ≤0.3%); PTFE/RPTFE/PEEK/Inconel seats verified for grade; cryogenic materials verified for low-temp impact (if specified); Inconel/Stellite verified for hardfacing.

Body manufacturing: (a) casting (WCB/CF8/CF8M for body) - sand casting or investment casting; (b) heat treatment (WCB normalizing/tempering; stainless solution annealing 1050-1100°C quench; alloy steel QT); (c) 100% visual; (d) NDT - radiographic/ultrasonic of critical sections (ball chamber, port necks, flange necks); (e) wall thickness (ASME B16.34); (f) flange machining - RF face or RTJ groove (precision, ASME B16.5/EN 1092-1/DIN 2501); (g) ball chamber/seat recess machining; (h) passivation (stainless - restore Cr₂O₃ layer); (i) chemical/mechanical/hardness per heat; (j) cryogenic treatment (if specified - LN2 soak, stabilize dimensions, eliminate residual stress); (k) RTJ groove - precision machined, surface finish verified.

Ball manufacturing: (a) forged/cast ball; (b) spherical surface grinding + lapping + mirror-polishing (Ra ≤0.8μm); (c) bore machining (full-bore); (d) passivation (stainless); (e) ball roundness/concentricity verified; (f) Inconel/Stellite hardfacing (if metal seat).

Seat manufacturing: (a) PTFE/RPTFE molded/machined; (b) PEEK machined; (c) Inconel metal machined/hardfaced; (d) dimensional check, surface finish; (e) cryogenic seat (PTFE/Kel-F) verified for low-temp shrinkage.

Stem: (a) machined, blow-out proof shoulder verified (dimensional); (b) surface finish; (c) passivation; (d) anti-static spring contact points verified. Assembly: (1) install seats (upstream + downstream); (2) insert floating ball, stem (blow-out proof verified), anti-static springs (ball-stem, stem-body - double); (3) assemble two-piece body, body gasket (spiral wound for RF, or RTJ ring), torque bolts in sequence/cross pattern; (4) install packing (PTFE/graphite), gland; (5) mount operator (lockable lever/pneumatic/electric); (6) anti-static continuity test (ball-stem-body resistance <10Ω); (7) full open/close cycle (smooth, 90°, floating ball moves freely); (8) position indication + lock device (full open/close).

Pressure testing: (1) 100% body hydrostatic shell 1.5×PN - zero external leak (body, flange, bolts, stem); (2) 100% seat leak 1.1×PN - ≤1×10⁻¹⁰ m³/s (API 598 Class IV) - bidirectional (both directions tested); (3) 100% air tightness (low-pressure air, bubble test); (4) API 598 / API 6D; (5) fire test (if specified, API 6FA/API 607 - 30 min fire, cool, verify seal); (6) cryogenic test (if specified, LN2 seal + operation at -196°C); (7) high-temp test (if specified, hot cycle).

Function testing: open/close torque (within spec), 90° travel, full-bore bore diameter, blow-out proof stem (pull test), anti-static continuity (<10Ω), face-to-face/end dimensions, flange dimensions (RF/RTJ - ASME B16.5), RTJ ring fit, lock device function, fire-safe metal backup seat (if specified).

Coating & marking: exterior - WCB epoxy paint (standard), stainless pickled/passivated, alloy high-temp paint; valve permanently marked with material (WCB/CF8/CF8M), pressure (PN/Class), size (DN/NPS), seal type, temp rating, floating ball, RF/RTJ, and certifications (stamped/laser - material marking critical for traceability).

Documentation: shipped with hydrostatic test report, material certificate (chemical/mechanical per heat), NDT report, PMI report, anti-static test report, blow-out proof report, fire test report (if applicable), cryogenic test report (if applicable), and installation/operation/maintenance manual (including floating-ball principle, RF/RTJ flange installation, fire-safe/anti-static care, maintenance).

Warranty: 18 months from shipment or 12 months from installation (valve body); actuator 12 months; extended warranty and third-party inspection (BV, SGS, TUV) available.

Q: What is the difference between a floating ball valve and a trunnion (fixed) ball valve?

A: Floating ball valve (this valve): The ball is NOT fixed to a bottom trunnion - it "floats" between two seats and can shift slightly. Under medium pressure, the ball is pushed downstream against the downstream seat, compressing the seat to form a seal. Sealing force comes from medium pressure (self-sealing - higher pressure = tighter seal). Advantages: simple design, fewer parts, lower cost, inherently bidirectional sealing, self-sealing (no external springs needed). Disadvantages: for large diameters or high pressures, the ball weight + high pressure creates high operating torque and increased seat wear/deformation. Best for: DN ≤200, PN ≤100 (this valve's range - DN15-200, PN16-100). Trunnion ball valve: The ball has top and bottom trunnions (shafts) fixed in the body with bearings. The ball cannot shift - fluid pressure is transferred to the bearings, not the seat. Advantages: low operating torque even for large DN/high pressure, supports DBB (Double Block & Bleed) (both seats seal + cavity bleed valve), better for high-pressure/large-diameter service. Disadvantages: more complex, more parts, higher cost. Best for: DN >200, high pressure (Class 600+), large pipeline transmission. Selection guide: (a) DN ≤200, PN ≤100, general service → floating ball (this valve - cost-effective, reliable); (b) DN >200 or high pressure Class 600+ → trunnion ball (lower torque, DBB); (c) need DBB (double isolation + bleed) → trunnion; (d) cost-sensitive, small/medium → floating. This valve = floating ball - correctly optimized for its DN15-200/PN16-100 range. Note: both are quarter-turn ball valves, both use ball with bore, both can be full-bore/reduced port - the difference is ball mounting (floating vs trunnion) and sealing mechanism (pressure-on-seat vs pressure-on-bearings).

Q: RF vs RTJ flanged connection - which do I need?

A: RF (Raised Face): The flange face has a raised ring (1-2mm height). A gasket (spiral wound graphite, PTFE, rubber, compressed non-asbestos) sits on the raised face and is compressed by bolts to form the seal. For: Class 150-300 (low/medium pressure, ≤PN50), general service, water/oil/gas/chemical. Advantages: most common, easy installation, cheaper gaskets, easy to find replacement gaskets. Gasket types: spiral wound (high temp/pressure), PTFE (chemical/corrosive), rubber/EPDM (water/low temp), compressed non-asbestos (general). RTJ (Ring Type Joint): The flange has a machined groove (oval or octagonal profile). A metal ring (soft iron, low-carbon steel, 304, 316, Inconel) sits in the groove; bolts compress the ring, which deforms into the groove to form a metal-to-metal seal. For: Class 600+ (high pressure), high temperature, critical oil & gas high-pressure pipelines. Advantages: very reliable high-pressure seal, no gasket blowout, metal-to-metal integrity. Disadvantages: more expensive, requires precision groove machining, the RTJ ring must be replaced every time the flange is disassembled (it deforms permanently), harder to find rings. Selection guide: (a) Class 150-300 / PN16-50 / general → RF (this valve standard); (b) Class 600+ / PN100 / high pressure / high temp / critical oil&gas → RTJ; (c) if your pipeline flange is RF → use RF valve; (d) if your pipeline flange is RTJ → use RTJ valve (cannot mix RF and RTJ); (e) verify flange standard (ASME B16.5, EN 1092-1, DIN 2501) matches pipeline. This valve offers both RF and RTJ - specify when ordering. Note: (a) RF gaskets are reusable sometimes (if undamaged); RTJ rings are not reusable (replace each disassembly); (b) RTJ requires higher bolt torque than RF; (c) for corrosive media, use PTFE/spiral wound gasket with RF; (d) for high-temp steam, use spiral wound graphite with RF or RTJ.

Q: What does "fire-safe" (API 6FA/607) mean, and do I need it?

A: Fire-safe valve = a valve designed to maintain sealing (at a controlled leakage rate) even after being exposed to fire - when the soft seat (PTFE/PEEK) burns/melts, a metal backup seat and graphite packing take over to prevent catastrophic media release. API 607: Fire test standard specifically for soft-seated quarter-turn valves (ball, plug, butterfly valves). Test: valve exposed to fire (750-1000°C) for 30 minutes, then water-cooled, then verified for external leakage (must be ≤ specified limit). API 6FA: Broader fire test standard for valves (includes metal-seated, larger sizes). Mechanism: (1) Normal operation: soft PTFE/PEEK seat provides zero leakage; (2) In fire: PTFE/PEEK burns/melts (PTFE decomposes ~500°C); (3) Metal backup seat/lip (Inconel/stainless, designed into body) + graphite packing (graphite doesn't burn) forms metal-to-metal seal; (4) Leakage increases (not zero) but is controlled (prevents catastrophic release = major fire/explosion); (5) After fire, valve may need seat replacement but body/metal parts survive. Do you need it? (a) Flammable media (oil, gas, gasoline, solvents, LPG) → YES, strongly recommended (fire-safe prevents major incident); (b) Hazardous locations (refineries, chemical plants, oil terminals, offshore) → YES (often required by code/insurance); (c) Water/steam/non-flammable → optional (not necessary); (d) Toxic media → recommended (prevents toxic release in fire); (e) Building code/insurance requirement → check local codes (many require fire-safe for flammable liquid piping). This valve offers fire-safe as optional (API 6FA/API 607) - specify when ordering for flammable/hazardous service. Note: (a) fire-safe valves cost more (metal backup seat, graphite packing, certification); (b) fire-safe does NOT mean valve survives fire undamaged - it means controlled leakage during/after fire; (c) after fire, valve must be inspected/repaired (seats replaced); (d) this valve also has double anti-static (standard) - prevents static spark ignition (complementary to fire-safe).

Q: Can this valve handle cryogenic (LNG/LOX/LIN) or high-temperature service?

A: Yes - with proper configuration. This valve has an ultra-wide temperature range of -196°C to 550°C (standard -40~220°C), but the actual temp capability depends on body material, seat material, and design configuration. Cryogenic service (-196°C to -40°C): (a) Media: LNG (liquefied natural gas, -162°C), LOX (liquid oxygen, -183°C), LIN (liquid nitrogen, -196°C), LAR (liquid argon, -186°C), ethylene, ammonia; (b) Body material: 316L austenitic stainless (not brittle at low temp) or LCB/LCC low-temp carbon steel - NOT standard WCB (WCB minimum -29°C, becomes brittle below); (c) Extended bonnet: required - keeps packing chamber above frost line (prevents stem freezing, maintains packing at near-ambient temp); (d) Seat: PTFE or Kel-F (PCTFE) (superior cryogenic performance, low shrinkage) - NOT standard PTFE alone (may shrink); (e) Cryogenic test: 100% LN2 seal + operation test (simulate actual -196°C); (f) Full-bore: for LNG transmission. High-temperature service (220°C to 550°C): (a) Media: superheated steam (up to 550°C), hot oil, hot gas, molten salt; (b) Body material: alloy steel (WC6/WC9/F11/F22 chrome-moly) or 310S stainless - NOT standard WCB (WCB max ~425°C); (c) Seat: Inconel/Stellite metal hard seal or graphite - NOT PTFE (PTFE max 180°C, melts); (d) Packing: flexible graphite (high temp, fire-safe); (e) Fire-safe: recommended (metal backup seat). Standard service (-40~220°C): (a) WCB/stainless body + PTFE/RPTFE/PEEK seat - most common; (b) PTFE ≤180°C, PEEK ≤250°C. Selection: (a) specify your operating temperature when ordering - we configure body/seat/bonnet accordingly; (b) cryogenic → specify "cryogenic, extended bonnet, 316L, LN2 test"; (c) high-temp >220°C → specify "high-temp, alloy body, Inconel/metal seat, graphite packing"; (d) standard -40~220°C → standard configuration. Important: (a) do NOT use standard WCB/PTFE valve for cryogenic or >220°C - will fail (brittle fracture, seat melting); (b) cryogenic valves require special handling (no moisture, clean for oxygen service); (c) high-temp valves require thermal expansion consideration (bolting, piping); (d) this valve's wide range is due to material/seat options - not a single configuration covers all temps.

Q: How does the floating ball achieve bidirectional sealing with such low leakage?

A: Floating ball bidirectional self-sealing mechanism: (1) Ball floats: The ball is not fixed to a trunnion - it sits between two seats (upstream + downstream) with a small clearance, allowing it to shift (float) slightly in the flow direction. (2) Pressure pushes ball: When valve is closed and medium pressure is applied upstream, the pressure acts on the ball's upstream face, pushing the ball downstream (toward the outlet). (3) Ball compresses seat: The downstream ball face presses against the downstream seat (PTFE/RPTFE/PEEK - soft, elastic). The seat compresses/deforms to conform to the ball surface, creating a tight seal. (4) Self-sealing = pressure-enhanced: The sealing force is proportional to medium pressure - higher pressure = ball pushed harder = seat compressed more = tighter seal. This is "self-sealing" (no external spring needed for main seal, though a spring may assist initial low-pressure seal). (5) Bidirectional: If flow is reversed (pressure from downstream), the ball is pushed upstream, compressing the upstream seat - same sealing effect. Thus the valve seals in both directions (bidirectional). (6) Very low leakage: With precision-machined ball (mirror-polished Ra ≤0.8μm) and high-quality soft seats, the seal is very tight - leakage ≤1×10⁻¹⁰ m³/s (API 598 Class IV). This is suitable for flammable, toxic, and hazardous media (prevents cross-contamination). Why it works: (a) soft seat (PTFE/PEEK) conforms to ball surface (microscopic irregularities filled); (b) ball is spherical + smooth (large contact area, uniform pressure); (c) pressure enhances seal (not degrades); (d) two seats = both directions. Comparison: (a) Floating ball: bidirectional self-sealing, pressure on seat, simple; (b) Trunnion ball: seats are spring-loaded (not pressure-pushed), ball fixed, DBB possible; (c) Gate valve: wedge/gate presses seat (not self-sealing); (d) Globe valve: disc presses seat (not self-sealing). This valve's floating ball design is inherently bidirectional and self-sealing - a key advantage for applications requiring tight shut-off in both flow directions. Note: (a) at very low pressure (<1 bar), self-sealing force is low - a spring-loaded seat may be added to assist initial seal; (b) at very high pressure (>PN100), seat may over-compress/deform - use trunnion ball for high pressure; (c) this valve's DN15-200/PN16-100 range is optimal for floating ball self-sealing.

Q: How do I install and maintain a flange floating ball valve?

A: Installation: (1) Verify: check valve size (DN), pressure (PN/Class), material (WCB/CF8/CF8M), seat (PTFE/RPTFE/PEEK/Inconel), flange type (RF/RTJ), temp rating - match pipeline; (2) Inspect: remove flange protectors, inspect flange face (RF) or RTJ groove (no damage, no debris), inspect ball (open/close manually to verify smooth), check for shipping damage; (3) Orientation: valve can be installed in any orientation (flow direction not critical - bidirectional), but recommend stem vertical/up (best packing life, easy operation); (4) Gasket: (a) RF flange: use appropriate gasket (spiral wound graphite for high temp/pressure, PTFE for chemical, rubber for water) - place centered on raised face; (b) RTJ flange: install new RTJ ring (oval/octagonal, correct material) in groove - never reuse RTJ ring; (5) Bolting: use correct bolts (grade B7/B8, matching pressure class), lubricate threads, torque in cross-pattern sequence (3-4 passes, final torque per spec) - ensures even gasket compression, prevents leak; (6) Connect pipeline: align flanges (no force - valve should fit without stress), install bolts, torque; (7) Test: pressurize pipeline slowly, check for external leaks (flange, body, stem), operate valve open/close several times; (8) Lock: if isolation valve, lock in desired position (open/close) using lock device. Maintenance: (1) Periodic exercise: full open/close cycle every 1-6 months (prevents seat seizure, especially if valve sits closed long); (2) Inspect external leaks: flange gasket, body bolts, stem packing - fix immediately (tighten flange bolts or packing gland); (3) Stem packing: if stem leaks, tighten gland bolts (1/4 turn at a time, don't over-tighten - may bind stem); if still leaks, replace packing; (4) Flange leak: if RF gasket leaks, tighten bolts (cross pattern); if still leaks, depressurize, replace gasket; if RTJ leaks, replace RTJ ring (must disassemble); (5) Seat replacement (if internal leak/seat worn): (a) depressurize + isolate pipeline; (b) disconnect valve from pipeline (or if split design allows, disassemble body); (c) unbolt body bolts, split body, remove ball, remove old seats; (d) inspect ball (scratches/wear - replace or re-grind if damaged); (e) install new seats, reassemble (new body gasket), torque bolts; (f) re-test (hydro, seat leak); (6) Anti-static: verify continuity periodically (multimeter between ball/body - should be <10Ω); (7) Fire-safe: if fire-safe, inspect metal backup seat/gasket during maintenance; (8) Cryogenic/high-temp: special inspection (extended bonnet frost, high-temp discoloration). Service life: (a) normal clean service (water, oil, gas): 15-25+ years (seats every 5-10 years); (b) corrosive/chemical: 5-15 years (depends on chemical - 316 better than WCB); (c) high-cycle: seats/actuator more frequent; (d) cryogenic/high-temp: 10-20 years (with proper material); (e) body: 20+ years (unless corroded/eroded). Spare parts kit: seat rings (PTFE/RPTFE/PEEK/Inconel), ball, stem, packing, body gasket, flange gasket (or RTJ ring), bolts, handle, operator repair kit - order with valve. Important: (a) always isolate + depressurize + drain before maintenance; (b) RTJ ring = replace every disassembly (deforms permanently); (c) stainless body - avoid carbon steel tools (iron contamination → rust), use stainless tools; (d) fire-safe valve - after any fire, must inspect/replace seats; (e) cryogenic valve - keep dry, no moisture (ice can jam); (f) re-test after any maintenance (hydro + seat leak); (g) 18-month warranty from shipment. With proper installation and periodic maintenance, flange floating ball valves provide very long, reliable, leak-free service.

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