Bottom Valve (Foot Valve) | Built-in Suction Strainer + Non-Return | Zero Dead Space Flush Mount |DN15–DN350 | PN0.25–16MPa | ≤425℃ | Flange/Threaded/Welded/Clamp | 45°/50°/90° Outlet | Manual/Pneumatic/Electric | CIP/SIP Sanitary

Our Bottom Valve is a special-purpose valve equipped with a built-in suction strainer, widely integrated into pipework systems, storage tanks, and vessels. Its core function is to hold medium pollutants, regulate liquid levels, and prevent reverse fluid flow, ensuring stability and efficiency, protecting pumps, flow meters, and downstream equipment from wear and clogging. The integrated non-return mechanism ensures fluid flows only in one direction, preventing backflow and maintaining system pressure stability. Whether for water supply, industrial fluid transfer, or process pipelines, this valve delivers consistent performance.

1. Double Protection - Strainer + Non-Return Function: Perforated Stainless Steel Suction Strainer Blocks Solid Impurities (Particles/Sediment/Rust Fragments), Protects Pumps/Flow Meters/Downstream Valves from Wear/Clogging/Malfunction; Integrated Non-Return Mechanism Ensures Unidirectional Flow (Tank→Pipe), Prevents Backflow, Maintains Pressure Stability, Eliminates Repeated Pump Priming: Equipped with a perforated stainless steel suction strainer, it effectively blocks solid impurities (particles, sediment, rust fragments, debris) from entering the pipeline, protecting pumps, flow meters, and check valves from wear, clogging, or malfunction. The integrated non-return mechanism ensures fluid flows only in one direction (from tank to pipe), preventing backflow and maintaining system pressure stability. Strainer function details: (a) perforated mesh/cage - precision-punched stainless steel (SUS304/SUS316) with uniform aperture (typically 1–6mm, customizable per application); (b) large open area - strainer surface area sized to minimize pressure drop even when partially fouled; (c) removable - strainer cage unbolts for cleaning/inspection without removing valve from pipeline (top-entry design); (d) corrosion resistant - stainless steel withstands water, glycol, mild chemicals; (e) protects downstream - prevents solids from reaching pump impeller (abrasion), flow meter (clogging/accuracy), control valves (seat damage), heat exchangers (fouling). Non-return function details: (a) automatic disc - piston or swing disc lifts on forward flow, drops on reverse; (b) priming retention - when pump stops, disc closes and keeps suction pipe + pump casing full of liquid - pump stays primed, no need to re-fill before restart; (c) pressure stability - prevents backflow from discharge side back into suction tank; (d) pump protection - prevents reverse rotation of pump on trip (which can damage seals/bearings/impellers). Synergy of dual function: combining strainer + check in one compact valve at the tank bottom means: (1) single installation point - one valve does the job of separate strainer + check valve, saves space/cost; (2) strainer protects check disc - clean fluid reaches the check mechanism, extending disc/seat life; (3) submerged installation - valve sits at tank bottom, strainer always submerged, no vortex/air entrainment; (4) easy maintenance - one valve to inspect/clean. This double protection - strainer filtration + non-return backflow prevention - makes the bottom valve the ideal all-in-one solution for pump suction and tank outlet applications, protecting both equipment and process integrity while simplifying the piping system.

2. Durable & Corrosion-Resistant Construction - Body Grey Cast Iron/Carbon Steel/SUS304/SUS316L/Custom Alloys, Excellent Mechanical Strength & Heat Capacity; Stainless Steel Internals (Spring, Strainer) Resist Corrosion; Tight Sealing Design Reduces Vibration/Turbulence/Leakage, Enhances System Reliability, Long Service Life in Harsh Fluid Environments: The valve body is made of high-quality materials (grey cast iron, carbon steel, SUS304, SUS316L, or custom alloys) with excellent mechanical strength and heat capacity. Internal components such as springs and strainers are crafted from stainless steel to resist corrosion, ensuring a long service life even in harsh fluid environments. The tight sealing design reduces vibration, turbulence, and leakage, enhancing overall system reliability. Material options: (a) Grey cast iron (HT200/HT250, GG25) - economical, good castability, vibration damping, suitable for water/glycol/non-corrosive at low/medium pressure; (b) Carbon steel (WCB, A216) - higher strength/pressure, -29~425℃, general industrial/oil/gas/steam; (c) SUS304/CF8 (A351) - corrosion resistant, oxidizing chemicals, water, -196~425℃ (cryogenic option); (d) SUS316L/CF8M (A351, low carbon) - superior chloride/pitting resistance, seawater, acetic acid, pharmaceutical/food sanitary, weldable; (e) Custom alloys - duplex 2205 (high strength + corrosion), Hastelloy/Monel (severe corrosive), 254SMO (chloride). Internal components: (a) strainer - SUS304/SUS316 perforated mesh/cage (corrosion resistant, robust); (b) spring - SUS304/SUS316 spring steel (corrosion resistant, consistent closing force); (c) disc/guide - stainless steel (precision machined, corrosion resistant); (d) fasteners - stainless steel bolts/nuts (no rust, easy maintenance). Sealing surface: (a) alloy (13Cr/410) - general, wear resistant; (b) carbide (Stellite/Co-Cr) - severe wear/corrosion/high-temp, plasma spray/overlay; (c) rubber (EPDM/NBR/FKM) - soft seal, bubble-tight, water/oil/chemical. Tight sealing benefits: (a) reduced vibration - disc guided, no flutter/chatter; (b) reduced turbulence - streamlined flow path, low noise; (c) no leakage - precision-lapped seat, soft seal option; (d) system reliability - no external leakage, no internal backflow leakage. Heat capacity: cast/steel body absorbs and dissipates heat - suitable for thermal cycling (hot/cold fluid alternation), reduces thermal stress. This durable, corrosion-resistant construction - with the right body material for every media, stainless internals, and tight sealing - ensures long, reliable service life even in harsh industrial, chemical, and sanitary fluid environments. Material selection per media/temperature - provide application details for optimal recommendation.

3. Zero Dead Space & Complete Drainage - Flush Mount Structure, Valve Seat Flush with Tank/Vessel Bottom, Eliminates Dead Space, Ensures Complete Drainage Without Residual Fluid, Crucial for Sterile Processes, Prevents Batch-to-Batch Contamination, Reduces Material Waste, CIP/SIP Compatible: Designed with a flush mount structure, the valve seat fits flush with the bottom of tanks or vessels, eliminating dead space and ensuring complete drainage without residual fluid. This feature is crucial for sterile processes, preventing contamination between batches and reducing material waste. What is "dead space"? Dead space (or dead leg) is a cavity/pocket in the piping/valve where fluid can become trapped and stagnant - it cannot drain, cannot be properly cleaned, and becomes a breeding ground for bacteria, a source of contamination, and a waste of product. How flush mount eliminates it: (a) valve seat at tank bottom level - the seating surface is flush with (or below) the tank bottom tangent line, so all fluid drains into the valve inlet; (b) no internal pockets - streamlined internal flow path, no cavities above/below disc that trap fluid; (c) strainer at lowest point - strainer cage sits at the very bottom, any sediment settles into strainer (removable for cleaning); (d) full bore drainage - when opened (manual/pneumatic/electric), the valve drains the tank completely to the last drop. Benefits: (1) sterile process - no stagnant fluid = no bacteria growth, no biofilm; critical for pharmaceutical, biotech, food, beverage, dairy; (2) batch-to-batch contamination prevention - complete drainage means no residual product from previous batch remains to contaminate next batch (e.g., different drug product, different food flavor, different chemical); (3) material waste reduction - complete drainage recovers all product, no valuable material left trapped (important for expensive pharmaceuticals, specialty chemicals); (4) CIP/SIP effectiveness - flush design allows CIP (clean-in-place) solution to reach all surfaces, no hidden areas; SIP (sterilize-in-place) steam contacts all surfaces, no cold spots; (5) quality compliance - meets ASME BPE (bioprocessing equipment) hygienic design requirements, FDA, EHEDG, 3-A sanitary standards; (6) easy cleaning - no trapped debris, strainer removable for manual clean. Drainage verification: tank can be drained to ≤0.1% residual (depending on tank bottom design - conical/dished bottom recommended for full drainage). Installation note: for maximum drainage, install valve at the lowest point of a conical or dished tank bottom (not flat bottom, which may leave a thin film). Tank bottom slope ≥1:100 toward valve. This zero-dead-space flush-mount design is a key differentiator from standard check valves (which have internal cavities) - making it the preferred choice for sterile, high-purity, and product-recovery applications where complete drainage and contamination prevention are non-negotiable.

4. Flexible Installation & Operation - Multiple Connection Types (Flange, Threaded, Welded, Clamp-On) & Outlet Angles (45°, 50°, 90°), Any Orientation to Fit Different Pipeline Layouts; Manual/Pneumatic/Electric Operation, Short Stroke for Quick Opening/Closing, Adapts to Various Operational Needs: Available in multiple connection types (flange, threaded, welded, clamp-on) and outlet angles (45°, 50°, 90°), it can be installed in any orientation to fit different pipeline layouts. The valve supports manual, pneumatic, or electric operation, with a short stroke for quick opening and closing, adapting to various operational needs. Connection types: (a) Flanged (ANSI B16.5 / EN 1092 / GB/T 9113 / JIS B2220) - most common, bolted between tank nozzle flange and pipe flange, easy removal/maintenance, all sizes/pressures; (b) Threaded (NPT / BSP / G) - small sizes (≤DN50), screwed into tank fitting, no flange needed, compact, low cost; (c) Welded (butt weld / socket weld) - permanent, zero external leakage, high pressure/hazardous, welded to tank nozzle/pipe; (d) Clamp-on (tri-clamp / sanitary clamp, ISO 2852 / ASME BPE) - quick-release sanitary, tool-free, crevice-free, for pharmaceutical/food/dairy, stainless only. Outlet angles: (a) 90° (straight/angle) - outlet perpendicular to inlet (inlet from bottom strainer, outlet horizontal to pipe) - most common, fits standard pump suction piping; (b) 45° - outlet at 45° - for angled piping, reduces elbows, lower pressure drop; (c) 50° - custom angle for specific tank/piping geometry; (d) straight-through (180°) - outlet in-line with inlet (vertical pipe) - for vertical riser applications. Any orientation: valve can be installed with outlet pointing any horizontal direction (rotate valve body before bolting) - fits piping from any side of tank. Operation modes: (a) Manual - handwheel/lever to open/close disc (for drain service, positive isolation, maintenance); (b) Pneumatic - air cylinder actuator (spring return or double acting), remote/automated control, fast response, suitable for process automation, hazardous areas (no electrical); (c) Electric - electric motor actuator, 4–20mA control, on/off or modulating, remote SCADA/DCS integration, suitable for large sizes or frequent operation. Short stroke: disc travel is short (typically 1/4–1/3 of bore) - quick opening/closing (seconds), minimal actuator force/size, low wear. Adaptability: (a) retrofit - multiple connections/angles allow replacing existing bottom valves without piping modification; (b) new install - choose connection/angle to optimize piping layout, minimize elbows/fittings (reduce cost + pressure drop); (c) automation level - manual for simple/small, pneumatic/electric for automated/large. This flexible installation + operation - with connection/angle/actuator options - ensures the bottom valve fits any tank, piping layout, and automation requirement - from simple manual drain valves to fully automated sanitary process valves. Specify connection type, standard, outlet angle, and operation mode when ordering.

5. Eco-Friendly & Energy-Saving - Optimized Low-Friction Design Minimizes Pump Energy Consumption; Completely Eco-Friendly, No Regular Maintenance Required, Saves Time & Operational Costs; For Water Pump Systems Eliminates Repeated Priming, Ensures Quick Efficient Pump Startup After Shutdowns, Reduces Downtime: The optimized design minimizes friction resistance, reducing energy consumption of pumps. It is completely eco-friendly and requires no regular maintenance, saving you time and operational costs. For water pump systems, it eliminates the need for repeated priming, ensuring quick and efficient pump startup after shutdowns. Energy saving mechanisms: (a) low pressure drop (ΔP) - streamlined full-bore flow path, strainer with large open area, disc fully retracted when open - minimal flow resistance, pump uses less energy to overcome valve ΔP; (b) no priming energy - check function keeps pump/suction pipe full, no need to run pump dry or use priming pump (which wastes energy/water); (c) quick startup - pump starts immediately (already primed), no warm-up/priming cycle, saves energy per start; (d) reduced pump wear - strainer protects impeller from abrasion, pump maintains efficiency longer (worn impellers consume more energy); (e) no actuator energy (automatic version) - non-return disc operates by flow pressure, no continuous power/air consumption. Eco-friendly: (a) no leakage - tight sealing prevents fluid loss to environment (no contamination, no product waste); (b) material recyclable - cast iron, carbon steel, stainless steel are fully recyclable; (c) no consumables - no filters to replace (strainer is cleanable, not disposable), no lubrication needed; (d) long life - durable construction means less frequent replacement (less material waste); (e) lead-free option - for potable water, no lead leaching. No regular maintenance: (a) self-cleaning strainer - in many applications, flow keeps strainer clean; periodic inspection only (not maintenance); (b) no lubrication - stainless internals, no grease/oil needed; (c) no adjustment - spring/disc set at factory, no field adjustment; (d) wear resistant - Stellite/rubber seat lasts years; (e) only periodic inspection - inspect strainer for fouling (frequency depends on media cleanliness), clean if needed (simple, quick). Pump priming elimination: (a) problem - centrifugal pumps cannot pump air/gas; if suction pipe drains after shutdown, pump must be re-primed (filled with liquid) before restart - time-consuming, requires priming pump or manual filling, risks running pump dry (damage); (b) solution - bottom valve check disc closes when pump stops, keeping suction pipe + pump full of liquid; on restart, pump immediately creates suction and flows - no priming needed; (c) benefit - quick startup (seconds vs minutes), no priming equipment, no dry-run damage, reduced operator attention. Cost savings: (energy saved) + (maintenance labor saved) + (no priming labor/equipment) + (extended pump life) + (reduced downtime) = lower total cost of ownership (TCO). This eco-friendly, energy-saving, maintenance-free design - combined with pump priming elimination - makes the bottom valve a cost-effective, sustainable choice for pump systems and tank outlets.

6. High Precision & Sanitary Compliance - Valve Surface Mechanically or Electropolished to 0.25μm Precision, Meets Strict Sanitary Standards for Pharmaceutical, Food & Beverage Industries; Optional CIP/SIP Ports for Easy Cleaning & Sterilization, Ensures Product Purity in Sterile Processes, Crevice-Free Design: The valve surface can be mechanically or electropolished to a precision of 0.25μm, meeting strict sanitary standards for pharmaceutical, food, and beverage industries. Optional CIP/SIP ports are available for easy cleaning and sterilization, ensuring product purity in sterile processes. Surface finish: (a) mechanical polishing - abrasive polishing to Ra ≤0.8μm (general sanitary); (b) electropolishing - electrochemical process removes surface iron, enriches chromium oxide passive layer, reduces roughness to Ra ≤0.25μm (ultra-smooth, high-purity sanitary); (c) benefits of 0.25μm - ultra-smooth surface resists bacterial adhesion/biofilm, easier CIP cleaning (no micro-crevices for soil), corrosion resistant (chromium-enriched), reduced particle shedding, aesthetic bright finish. Sanitary standards met: (a) ASME BPE (Bioprocessing Equipment) - hygienic design, surface finish, material standards for biopharmaceutical; (b) FDA - materials comply with FDA 21 CFR for food contact; (c) EHEDG (European Hygienic Engineering & Design Group) - hygienic design guidelines; (d) 3-A Sanitary Standards - US dairy/food sanitary; (e) USP Class VI - material biocompatibility (for WFI/parenteral). CIP (Clean-in-Place): (a) CIP ports - optional spray balls or tangential inlet ports allow CIP solution (caustic, acid, water) to circulate through valve internals without disassembly; (b) flush design - no dead space, CIP solution reaches all surfaces; (c) process - pre-rinse → caustic wash → intermediate rinse → acid wash → final rinse → sanitize; (d) validation - CIP cycle can be validated for residue removal (TOC/swab test). SIP (Sterilize-in-Place): (a) SIP ports - steam (121–140℃, 2–3 bar) introduced through dedicated ports, condenses through valve, sterilizes all wetted surfaces; (b) temperature rated - PTFE/EPDM seals rated for SIP temperatures (PTFE ≤200℃, EPDM ≤150℃; for higher SIP use FKM or metal seal); (c) duration - typically 30 min at 121℃ (F0 ≥15 for sterility assurance); (d) cool down - post-SIP cooling with sterile air/water to prevent vacuum. Crevice-free design: (a) no threads in wetted area - sanitary clamp connections, no NPT threads that trap soil; (b) smooth transitions - no sharp internal corners, radiused transitions; (c) no dead legs - flush mount, zero dead space; (d) strainer removable - for manual inspection/cleaning if CIP insufficient. Applications requiring this: (a) pharmaceutical - WFI loops, USP PW, bioreactors, fermentation, parenteral drug, API; (b) biotech - cell culture, monoclonal antibody, vaccine; (c) food & beverage - dairy (milk, CIP), brewery (wort, yeast), beverage (syrup), wine; (d) cosmetics/personal care - high-purity product; (e) semiconductor - UPW distribution. Documentation: surface finish test (Ra), passivation test, material cert (316L low carbon, sulfur content), CIP/SIP validation support. This high-precision sanitary compliance - 0.25μm electropolish, CIP/SIP capability, crevice-free design - makes the bottom valve suitable for the strictest sterile and high-purity applications, where product purity, cleanability, and sterility are critical. Specify sanitary finish (mechanical/electropolished) and CIP/SIP ports when ordering for pharma/food/biotech.

Bottom Valve (Foot Valve): installed at pump suction pipe bottom or tank bottom, integrates perforated stainless suction strainer + non-return disc. Strainer first - perforated mesh blocks solid impurities, allows clean fluid to pass; protects pump/flow meter/downstream from abrasion/clogging. Non-return disc - forward flow: pump suction creates pressure differential, fluid pressure lifts disc off seat - flow passes, unidirectional. Pump stops/reverse: disc drops onto seat - blocks reverse flow, keeps suction pipe/pump primed, eliminates repeated priming.

Petrochemical, Alumina, Steel & Polymer Industries - Process Pipelines, Reactors, Storage Tanks, Pump Suction, Corrosive/Abrasive Media, High-Temp, Carbon Steel/Alloy Body, Strainer Protects Pumps/Equipment: Used in petrochemical, alumina, steel, and polymer industries - process pipelines, reactors, storage tanks, pump suction lines. The durable construction (carbon steel/WC6/WC9 alloy body for high-temp, stainless for corrosive) and built-in strainer protect pumps and equipment from abrasive/corrosive media. Applications: petrochemical - reactor feed tanks, solvent storage, pump suction (strainer prevents catalyst/solids from damaging pump), distillation column bottoms; alumina - caustic soda tanks, slurry lines (specific slurry models), digestion tanks; steel - cooling water tanks, hydraulic systems, chemical dosing; polymer - resin tanks, monomer storage, polymer solution lines. The non-return function maintains pump priming and prevents backflow between process units. The zero dead space design ensures complete tank drainage for batch processes and product changeover. High-temperature capability (≤425℃ with alloy body/metal seal) suits hot process fluids. Flanged or welded connections for high-pressure industrial service. This heavy-industry capability makes the bottom valve the workhorse of petrochemical, metallurgical, and polymer plant tank outlets and pump suction systems.

Pharmaceutical, Food, Beverage & Biotechnology - Sterile Processes, WFI Systems, Fermentation Tanks, CIP/SIP Compatible, Electropolished 0.25μm, Crevice-Free, Zero Dead Space, Batch-to-Batch Contamination Prevention, Product Recovery: Used in pharmaceutical, food, and beverage industries - sterile processes, WFI (Water for Injection) systems, fermentation tanks, bioreactors, USP PW loops, and biotechnology sterile process systems (CIP/SIP compatible models). The electropolished 0.25μm surface, crevice-free design, zero dead space flush mount, and CIP/SIP capability meet the strictest sanitary requirements. Applications: pharmaceutical - WFI storage/distribution (strainer protects polishing loop, non-return prevents backflow contamination), API reactors, solvent tanks, parenteral drug manufacturing; biotech - fermentation tanks (strainer prevents biomass from entering pump, CIP/SIP between batches), cell culture, media prep; food & beverage - dairy (milk storage, CIP loops, soft-seat EPDM), brewery (fermenters, wort, yeast propagation), beverage (syrup tanks, water treatment), wine (fermentation, storage). The zero dead space ensures complete drainage - critical for batch-to-batch product changeover (no residual previous product contaminating next batch) and product recovery (no valuable product wasted). The CIP/SIP ports allow automated cleaning/sterilization without valve removal. Tri-clamp sanitary connection for tool-free disassembly. SUS316L body with low carbon (weldable, no sensitization) and electropolished finish. This sanitary specialization makes the bottom valve the standard for high-purity pharmaceutical, biotech, and food & beverage tank outlet and pump suction applications.

Mining, Mineral Processing & Wastewater Treatment - Slurry (Specific Models), Abrasive Media, Wastewater, Sewage, Heavy-Duty Strainer, Wear-Resistant Seat, Grey Cast Iron/Carbon Steel Body, Large Flow, Pump Protection: Used in mining, mineral processing, and wastewater treatment - handling slurry (for specific heavy-duty models), abrasive mineral slurries, wastewater, sewage, and industrial effluent. The robust strainer and wear-resistant construction handle dirty, abrasive media. Applications: mining - slurry tanks, tailings ponds, process water, pump suction (strainer prevents large rocks/debris from damaging slurry pumps); mineral processing - flotation feed, thickener underflow, leaching tanks, water recycling; wastewater treatment - sewage wet wells, lift stations, aeration tanks, sludge tanks, chemical dosing; industrial wastewater - cooling water blowdown, process effluent, rainwater. The perforated stainless strainer blocks large debris (rocks, rags, plastic, scale) while allowing slurry/water to pass - protecting pump impellers from catastrophic damage. Specific slurry models feature: (a) heavy-duty strainer (thicker gauge, larger bars); (b) wear-resistant seat (Stellite carbide or rubber for abrasion); (c) grey cast iron or carbon steel body (economical, robust); (d) large flow area (low pressure drop even with solids). The non-return function keeps pump primed and prevents backflow of sewage/slurry back into tank. Flanged connection for large sizes (DN100–DN350). Easy strainer removal for cleaning (critical in dirty applications - strainer will foul, must be cleaned periodically). This mining/wastewater capability - with heavy-duty strainer and wear-resistant design - makes the bottom valve suitable for dirty, abrasive, and high-solids applications where standard valves would clog or wear rapidly.

Municipal Water Supply, Drainage & Irrigation - Potable Water (Lead-Free Option), Pump Stations, Reservoirs, Drainage, Sewage, Agricultural Irrigation, Large-Diameter, Low Cost, No Maintenance, Eliminates Pump Priming: Used in municipal water supply, drainage, and irrigation systems - pump stations, reservoirs, water towers, drainage sumps, sewage lift stations, and agricultural irrigation pipelines. The economical grey cast iron or ductile iron body, large sizes, and no-maintenance design make it ideal for municipal infrastructure. Applications: municipal water supply - water treatment plant pump suction, reservoir outlet, distribution pump stations (strainer protects pumps, non-return maintains priming, lead-free option for potable); drainage - stormwater pump stations, drainage sumps, flood control (strainer blocks debris, non-return prevents backflow when pump stops); sewage - lift stations, wet wells (specific models handle sewage); agricultural irrigation - pump suction from wells/canals/reservoirs, mainline (eliminates priming, protects pump from sand/debris), sprinkler/drip systems. The bottom valve is typically installed at the bottom of the suction pipe, submerged in the water source (well, canal, reservoir) - the strainer keeps out fish, debris, sediment, and the check valve keeps the pipe primed. For irrigation, this means the pump starts instantly (no priming) and the system stays pressurized. For municipal potable water, NSF/ANSI 61 & 372 lead-free option available. Large diameters (to DN350) for high-flow municipal/irrigation pumps. Low cost (grey cast iron) and no regular maintenance make it economical for widespread municipal use. This municipal/irrigation specialization - large sizes, low cost, no maintenance, pump priming - makes the bottom valve the standard for water supply, drainage, and agricultural irrigation pump suction systems.

Pump Supporting Facilities, Storage Tanks, Reactors & Process Pipelines - General Industrial, Pump Suction, Tank Outlet, Reactor Bottom, Process Lines, All Connection Types, All Operation Modes, Versatile All-In-One Strainer+Check: Used in pump supporting facilities, storage tanks, reactors, and process pipelines - as a versatile all-in-one strainer + check valve at any tank outlet or pump suction point. This is the general/utility application across all industries. Applications: pump supporting - centrifugal pump suction (the primary application - strainer + priming + backflow prevention in one valve), positive displacement pump inlet, booster pump, fire pump; storage tanks - any liquid storage tank outlet (water, oil, chemical, solvent), tank farm, day tanks, feed tanks; reactors - reactor bottom outlet/drain (zero dead space for complete product discharge, strainer protects pump from catalyst/solids), batch reactors, CSTR; process pipelines - anywhere a strainer + check is needed in a compact footprint (replaces separate strainer + check valve, saves space/cost). The multiple connection types (flange/threaded/welded/clamp) and outlet angles (45°/50°/90°) fit any piping layout. Manual/pneumatic/electric operation options: manual for simple drain/isolation, pneumatic/electric for automated process control. The all-in-one design means: (a) one valve instead of two (strainer + check) - lower cost, less space, fewer leak points; (b) single maintenance point; (c) strainer protects the check mechanism (clean fluid = longer seal life). This general versatility makes the bottom valve the go-to solution for any tank outlet or pump suction application across all industries - from simple water tanks to complex chemical reactors.

Every Bottom Valve: Casting - grey cast iron/carbon steel/SUS304/SUS316L body, UT. Material - certified, MTR 3.1, heat traceable. Strainer - perforated stainless mesh, aperture verified. Disc - stainless, short stroke. Seat - alloy/carbide/rubber. Flush mount - zero dead space. Connections - flange/threaded/welded/clamp. Assembly - strainer, disc, seat, stroke. Pressure - 100% shell 1.5×rated, seat 1.1×rated, zero leak GB/T 13927 / API 598. Functional - forward opens, reverse closes. Surface - carbon epoxy. Marking - material/size/pressure/flow. Docs - MTR, cert. Warranty: 18 months.

Q1: What is a bottom valve (foot valve), and how does the integrated suction strainer + non-return dual function work?

A: A bottom valve (also called a foot valve) is a specialized type of check valve installed at the bottom of a pump suction pipe or submerged at the outlet of a storage tank/vessel - it integrates two functions in one compact valve: (1) suction strainer and (2) non-return (check) valve. How the strainer works: The valve has a perforated stainless steel mesh/cage (strainer) at its inlet (the part submerged in the tank). As fluid is drawn toward the pump, it first passes through the strainer - solid impurities (particles, sediment, rust fragments, debris, rocks, rags) larger than the strainer aperture are blocked and held in the strainer cage, while clean fluid passes through to the valve inlet and then to the pump. This protects the pump impeller, flow meter, and downstream valves/equipment from abrasion, clogging, and damage. The strainer is removable (unbolt the cage) for periodic cleaning. How the non-return works: After the strainer, the fluid encounters a check disc (piston or swing type). When the pump runs, the suction pressure differential lifts the disc off its seat - fluid flows from the tank, through the strainer, through the open valve, into the suction pipe, and to the pump (unidirectional, tank→pipe). When the pump stops or flow reverses, the disc drops (by gravity and/or spring) back onto its seat - blocking reverse flow. This keeps the suction pipe and pump casing full of liquid (primed), so when the pump restarts, it immediately pumps fluid without needing to be re-primed (filled with liquid). Why combine them? (a) space/cost saving - one valve does the job of a separate strainer + check valve; (b) single installation point at the tank bottom; (c) strainer protects the check disc (clean fluid reaches the check mechanism, extending seal life); (d) submerged - valve sits at tank bottom, strainer always submerged, no air entrainment. Key benefit for pumps: eliminates repeated priming - without a foot valve, a centrifugal pump's suction pipe would drain after shutdown, requiring manual priming before every restart (time-consuming, risks dry-run damage). With a foot valve, the pipe stays primed. Where installed: always at the lowest point of the suction system - either at the bottom of a vertical suction pipe submerged in a well/canal/reservoir, or flange-mounted at the bottom nozzle of a storage tank. This dual-function design makes the bottom valve the standard all-in-one solution for pump suction and tank outlet applications.

Q2: What is "zero dead space flush mount," and why is complete drainage important for sterile processes?

A: "Zero dead space" (or "no dead leg") means the valve has no internal cavities or pockets where fluid can become trapped and stagnant. "Flush mount" means the valve seat and inlet are mounted flush with (or below) the bottom of the tank/vessel - so the tank bottom drains completely into the valve, with no residual fluid left in the tank or valve. Why dead space is a problem: (a) bacteria growth - stagnant trapped fluid becomes a breeding ground for bacteria/biofilm; (b) contamination - residual product from a previous batch can contaminate the next batch (e.g., different drug, different food flavor, different chemical); (c) cleaning failure - CIP (clean-in-place) solution cannot reach hidden dead-space surfaces, so they remain dirty; (d) sterilization failure - SIP steam cannot penetrate dead spaces, leaving unsterilized areas; (e) product waste - valuable product trapped in dead space cannot be recovered (especially costly for pharmaceuticals/specialty chemicals). How flush mount achieves zero dead space: (a) valve seat at tank bottom level - seating surface is flush with the tank bottom tangent line, so all fluid drains into the valve; (b) streamlined internal path - no cavities above/below the disc, no sharp corners; (c) strainer at lowest point - any sediment settles into the removable strainer (not trapped in the valve); (d) full-bore drain - when opened, the valve drains the tank to the last drop. Why complete drainage matters for sterile processes: (1) batch-to-batch contamination prevention - in pharmaceutical/food batch production, complete drainage ensures no residual previous product remains; (2) CIP/SIP effectiveness - flush design allows CIP solution and SIP steam to reach 100% of wetted surfaces (no hidden areas); (3) product recovery - complete drainage recovers all product, reducing material waste and cost; (4) quality compliance - meets ASME BPE, FDA, EHEDG, 3-A sanitary design standards; (5) no bacterial harborage - no stagnant fluid = no biofilm. Installation tip for maximum drainage: install the valve at the lowest point of a conical or dished tank bottom (not a flat bottom, which may leave a thin film). Tank bottom should slope ≥1:100 toward the valve. With proper tank design + flush-mount bottom valve, residual can be ≤0.1% of tank volume. Compare to standard check valves: regular check valves have internal cavities (bonnet area, disc guide pockets) that trap fluid - they are not designed for complete drainage. The bottom valve's flush, crevice-free design is purpose-built for drainage and sterile service. This zero-dead-space flush-mount feature is a key differentiator - making the bottom valve the preferred choice for sterile, high-purity, and product-recovery applications where complete drainage and contamination prevention are critical.

Q3: What materials and seal options are available, and how do I select the right combination for my media and temperature?

A: Body materials: (a) Grey cast iron (HT200/HT250, GG25) - economical, good castability, vibration damping; for water, glycol, non-corrosive media, low/medium pressure (PN≤16), temperature ≤120℃; not for high pressure or strong corrosion; (b) Carbon steel (WCB, A216) - higher strength/pressure, -29~425℃; for oil, gas, steam, general industrial, petrochemical; (c) SUS304/CF8 (A351 stainless) - corrosion resistant, oxidizing chemicals, water, -196~425℃ (cryogenic option with extended bonnet); (d) SUS316L/CF8M (A351, low carbon) - superior chloride/pitting resistance (molybdenum addition), seawater, acetic acid, pharmaceutical/food sanitary, weldable (low carbon avoids sensitization); (e) Custom alloys - duplex 2205 (high strength + corrosion), Hastelloy C (severe corrosive/strong acids), Monel (seawater/acid), 254SMO (high chloride). Internal components: strainer, spring, disc, guide - all stainless steel (SUS304/SUS316) for corrosion resistance; fasteners stainless. Sealing surface options: (a) Alloy (13Cr/410 stainless) - general service, wear resistant, ≤425℃, metal-to-metal seal (not bubble-tight); (b) Carbide (Stellite/Co-Cr, plasma spray or overlay) - severe wear, corrosion, high-temperature (retains hardness to 600℃+), for abrasive slurry, high-temp steam, cavitation; (c) Rubber (EPDM, NBR, FKM/Viton) - soft seal, bubble-tight zero leakage; EPDM for water/steam ≤150℃ (NOT for oil), NBR for oil/fuel ≤100℃, FKM for oil/chemical ≤200℃ (NOT for steam >150℃). Selection guide by media: (1) Water (potable/cold/hot ≤120℃) → grey cast iron or SUS304 body + EPDM soft seat + NSF lead-free option; (2) Steam (>120℃, high-temp) → carbon steel/WCB body + alloy or Stellite metal seat (rubber fails at high temp); (3) Oil/petroleum/fuel → WCB body + NBR (≤100℃) or FKM (≤200℃) soft seat, or metal seat for high-temp; (4) Chemical (acid/alkali/solvent) → SUS304/SUS316 body + PTFE soft seat (≤200℃) or metal seat; (5) Seawater/brine/chloride → SUS316L/duplex body + EPDM/PTFE seat; (6) Slurry/abrasive (mining/wastewater) → grey cast iron/WCB body + Stellite carbide or rubber seat (wear resistant), heavy-duty strainer; (7) Cryogenic (-196℃, LNG/liquid N2) → 316L body + extended bonnet + PTFE/metal seat; (8) Pharmaceutical/food (WFI/USP PW/clean steam) → SUS316L electropolished body + EPDM/PTFE (FDA-compliant) seat + tri-clamp + CIP/SIP. Temperature check: the seat material is usually the limiting component - always verify seat max temperature (rubber < metal < Stellite). If your temperature exceeds soft seat limit, use metal/Stellite seat. Pressure check: all materials available for full pressure range (PN0.25–16MPa, Class 150–300). Provide media, temperature, pressure, and application - we will recommend the optimal body/seal/strainer combination. Custom materials and FDA/USP-compliant seals available on request.

Q4: What connection types, outlet angles, and operation modes are available, and how do I choose?

A: Connection types: (a) Flanged (ANSI B16.5 / EN 1092-1 / GB/T 9113 / JIS B2220) - most common, bolted between tank nozzle flange and pipe flange; easy removal/maintenance; all sizes (DN15–DN350) and pressures; recommended for general industrial, petrochemical, municipal, large sizes; (b) Threaded (NPT ASME B1.20.1 / BSP / G) - small sizes only (≤DN50), screwed into tank fitting; no flange needed, compact, low cost; for utility, water, small pumps; NOT for sanitary (threads trap soil); (c) Welded (butt weld ASME B16.25 / socket weld ASME B16.11) - permanent, zero external leakage; for high pressure, hazardous media, critical service; requires cutting pipe for valve removal; for oil/gas, chemical, high-pressure; (d) Clamp-on / tri-clamp (sanitary, ISO 2852 / ASME BPE) - quick-release sanitary clamp, tool-free disassembly, crevice-free gasket; for pharmaceutical, food, dairy, biotech; stainless only; sizes ≤DN300 typically. Outlet angles: (a) 90° (angle type) - inlet from bottom (strainer), outlet horizontal perpendicular to inlet; most common, fits standard pump suction piping where pipe runs horizontally from tank; (b) 45° - outlet at 45° from vertical; for angled piping, reduces number of elbows, lower pressure drop; (c) 50° - custom angle for specific tank/piping geometry; (d) straight-through (180°) - outlet in-line with inlet (vertical); for vertical riser applications where pipe goes straight up from tank. Any orientation: the valve body can be rotated (before bolting/welding) so the outlet points any horizontal direction - fits piping approaching from any side of the tank. Operation modes: (a) Automatic (non-return only) - disc operates by flow pressure, no actuator; for simple pump suction priming/backflow prevention (the most common bottom valve); (b) Manual - handwheel or lever to positively open/close the disc; for drain service, tank isolation, maintenance (positive shut-off); (c) Pneumatic - air cylinder actuator (spring return or double acting); remote/automated control, fast response, suitable for hazardous areas (no electrical), process automation; (d) Electric - electric motor actuator, on/off or modulating (4–20mA), remote SCADA/DCS integration; for large sizes, frequent operation, or where air is unavailable. Short stroke: disc travel is short (1/4–1/3 of bore) - quick opening/closing, minimal actuator force/size, low wear. Selection guide: (1) general pump suction (water/oil/chemical) → flanged 90° automatic; (2) small/utility → threaded 90° automatic; (3) high-pressure hazardous → welded 90° automatic; (4) pharmaceutical/food sanitary → tri-clamp 90° manual/pneumatic + CIP/SIP; (5) tank drain/isolation → flanged 90° manual; (6) automated process → flanged 90° pneumatic/electric; (7) angled piping → 45°/50° outlet; (8) vertical riser → straight-through 180°. Specify connection type + standard, outlet angle, and operation mode when ordering. Custom connections/angles available for special requirements.

Q5: What applications and media are suitable, and what maintenance is required?

A: Suitable applications: (1) Petrochemical, alumina, steel, polymer - process tanks, reactors, pump suction, corrosive/abrasive/high-temp media; (2) Pharmaceutical, food, beverage, biotechnology - WFI/USP PW loops, fermentation tanks, bioreactors, sterile processes (CIP/SIP, electropolished, zero dead space); (3) Mining, mineral processing, wastewater - slurry (specific heavy-duty models), abrasive media, sewage, wastewater; (4) Municipal water supply, drainage, irrigation - pump stations, reservoirs, wells, canals, agricultural irrigation (large sizes, low cost, no maintenance); (5) General pump supporting, storage tanks, reactors, process pipelines - any tank outlet or pump suction needing strainer + check. Suitable media: (a) neutral fluids (water, glycol solutions); (b) industrial & drinking water (potable with NSF lead-free option); (c) glycol (antifreeze, heat transfer); (d) oil (petroleum, fuel, lubricating); (e) non-corrosive media (general industrial fluids); (f) slurry (specific heavy-duty models with reinforced strainer + wear-resistant seat); (g) corrosive chemicals (with stainless body + PTFE seat); (h) steam/high-temp (with metal/Stellite seat, ≤425℃); (i) cryogenic (316L + extended bonnet, -196℃). NOT suitable for: (a) high-viscosity fluids that may clog strainer (unless large aperture); (b) media with large solids exceeding strainer aperture (will block); (c) media incompatible with selected body/seal material (verify chemical compatibility); (d) vacuum service (check valve may not seal under vacuum - use positive shut-off manual valve). Maintenance required: The bottom valve is designed for minimal maintenance - (a) no lubrication (stainless internals, no grease); (b) no adjustment (spring/disc factory-set); (c) no regular parts replacement (seat/disc last years); (d) periodic inspection only - inspect strainer for fouling (frequency depends on media cleanliness: clean water = annually, dirty water/slurry = monthly/quarterly); (e) strainer cleaning - if fouled, remove strainer cage (unbolt), clean/flush, reinstall (simple, quick, no special tools); (f) seat inspection - during strainer cleaning, inspect seat/disc for wear/damage; replace if worn (spare parts available); (g) sanitary models - CIP/SIP cycles per SOP, periodic surface finish inspection. Maintenance tips: (1) install with isolation valve upstream if possible (for servicing without draining tank); (2) use strainer aperture appropriate for media (too small = clogs fast, too large = passes damaging solids); (3) for slurry/dirty applications, plan for frequent strainer cleaning; (4) keep spare seat/gasket on hand for critical applications. Expected service life: 5–15+ years depending on media (clean water = long, abrasive slurry = shorter), with proper maintenance. This low-maintenance, versatile design - across applications from sterile pharma to dirty mining slurry - makes the bottom valve a reliable, cost-effective choice. Provide your application details for specific maintenance interval recommendations.

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