American Standard Flange Gate Valve | API 600 | Class 150–2500

Our American Standard Flange Gate Valve (ANSI/API) is engineered to meet API 600, ANSI B16.34, ASME B16.5, and API 6D, ensuring interchangeability and global adaptability. RF/RTJ flanged per ANSI B16.5 for easy installation/maintenance. Used to cut off or connect pipeline media with small flow resistance, reliable Stellite/13Cr hardfaced sealing, and harsh-condition adaptability. Wedge (single/double/elastic) or parallel gate, OS&Y rising stem, bolted/welded bonnet, rolling bearings on large sizes. Class 150–2500, DN25–DN1000, -196~815°C, WCB/CF8/CF8M/Monel, manual/electric/pneumatic/hydraulic. For water, steam, oil, gas, corrosive fluids in petroleum, chemical, power, metallurgy, tested per API 598, zero leakage.

1. Strictly Compliant with American Standards: Fully conforms to API 600 (steel gate valves for petroleum and natural gas industries), ANSI B16.34 (valves pressure-temperature rating), ASME B16.5 (pipe flanges and flanged fittings dimensions), and API 6D (pipeline valves) standards, ensuring high standardization, dimensional interchangeability, and strong universality in the international market. This compliance simplifies valve selection, guarantees compatibility with globally standardized piping systems, and facilitates installation, maintenance, and spare parts sourcing anywhere in the world - making it the preferred choice for international EPC projects and multinational operators.

2. Reliable Sealing Performance: Adopts wedge-type or parallel-type gate design. The wedge-type gate (single disc, double disc, or elastic/flexible wedge) realizes self-tightening sealing through the wedge angle, adapting to temperature changes and reducing leakage caused by thermal expansion and contraction; the parallel-type gate with spring-loaded dual disc is suitable for low-pressure and large-diameter scenarios. The sealing surface is overlay-welded with hard alloy (such as 13Cr, Cr5Mo, Stellite/CoCr), greatly improving wear resistance, scratch resistance, and corrosion resistance, achieving "zero leakage" in line with API 600 requirements and ensuring long-term tight shutoff even under cyclic thermal conditions.

3. Excellent Structural Design: The valve stem adopts an outside screw and yoke (OS&Y) design, allowing intuitive visual observation of the valve opening through the rising stem position - the stem rises when opening and lowers when closing, providing a clear mechanical indicator. A small number of high-pressure models adopt an inside screw (non-rising stem) design for compact installation and better pressure resistance. The valve body and bonnet are connected by bolts for easy disassembly and maintenance; high-pressure models adopt a welded bonnet to enhance overall strength. For large-size and high-pressure manual valves, rolling bearings are equipped in the yoke/operating device to reduce operating torque, making opening and closing light and labor-saving.

4. Wide Working Condition Adaptability: The pressure range covers ANSI Class 150 (approximately 2.0 MPa at ambient) through Class 2500 (approximately 42.0 MPa), and the temperature range extends from -196°C (cryogenic liquid nitrogen service, with extended bonnet and low-temperature materials) to 815°C (high-temperature steam service, with alloy steel construction). This extraordinary range allows a single valve family to adapt to virtually any industrial fluid - water, steam, oil products, natural gas, and corrosive fluids - from cryogenic processing to ultra-supercritical power plants, with proper material selection for each service condition.

5. Flexible Operation Modes: Supports multiple driving methods - manual (handwheel), electric (with local/remote control, 4–20mA feedback, explosion-proof options), pneumatic (spring-return fail-safe), hydraulic, and electro-hydraulic linkage - meeting the needs of manual operation for small valves and automatic control for large valves or remote/automated control scenarios. This flexibility improves operation efficiency, enables integration into SCADA/DCS process control systems, and provides fail-safe actuation options for critical safety-related isolation service in hazardous plant environments.

6. Durable Material Selection: The valve body and internal parts can be reasonably matched according to actual working conditions, including carbon steel (ASTM A216 WCB) for general service, stainless steel (CF8, CF3, CF8M, CF3M / 304, 316, 304L, 316L) for corrosive and low-temperature service, and specialty alloys such as Monel for seawater and highly corrosive media. All materials provide high strength, pressure resistance, and corrosion resistance appropriate to their intended service, extending the valve's service life and reducing lifecycle maintenance costs. Full material traceability (MTR) is provided for every pressure-containing part.

1. Strictly Compliant with American Standards: Fully conforms to API 600 (steel gate valves for petroleum and natural gas industries), ANSI B16.34 (valves pressure-temperature rating), ASME B16.5 (pipe flanges and flanged fittings dimensions), and API 6D (pipeline valves) standards, ensuring high standardization, dimensional interchangeability, and strong universality in the international market. This compliance simplifies valve selection, guarantees compatibility with globally standardized piping systems, and facilitates installation, maintenance, and spare parts sourcing anywhere in the world - making it the preferred choice for international EPC projects and multinational operators.

2. Reliable Sealing Performance: Adopts wedge-type or parallel-type gate design. The wedge-type gate (single disc, double disc, or elastic/flexible wedge) realizes self-tightening sealing through the wedge angle, adapting to temperature changes and reducing leakage caused by thermal expansion and contraction; the parallel-type gate with spring-loaded dual disc is suitable for low-pressure and large-diameter scenarios. The sealing surface is overlay-welded with hard alloy (such as 13Cr, Cr5Mo, Stellite/CoCr), greatly improving wear resistance, scratch resistance, and corrosion resistance, achieving "zero leakage" in line with API 600 requirements and ensuring long-term tight shutoff even under cyclic thermal conditions.

3. Excellent Structural Design: The valve stem adopts an outside screw and yoke (OS&Y) design, allowing intuitive visual observation of the valve opening through the rising stem position - the stem rises when opening and lowers when closing, providing a clear mechanical indicator. A small number of high-pressure models adopt an inside screw (non-rising stem) design for compact installation and better pressure resistance. The valve body and bonnet are connected by bolts for easy disassembly and maintenance; high-pressure models adopt a welded bonnet to enhance overall strength. For large-size and high-pressure manual valves, rolling bearings are equipped in the yoke/operating device to reduce operating torque, making opening and closing light and labor-saving.

4. Wide Working Condition Adaptability: The pressure range covers ANSI Class 150 (approximately 2.0 MPa at ambient) through Class 2500 (approximately 42.0 MPa), and the temperature range extends from -196°C (cryogenic liquid nitrogen service, with extended bonnet and low-temperature materials) to 815°C (high-temperature steam service, with alloy steel construction). This extraordinary range allows a single valve family to adapt to virtually any industrial fluid - water, steam, oil products, natural gas, and corrosive fluids - from cryogenic processing to ultra-supercritical power plants, with proper material selection for each service condition.

5. Flexible Operation Modes: Supports multiple driving methods - manual (handwheel), electric (with local/remote control, 4–20mA feedback, explosion-proof options), pneumatic (spring-return fail-safe), hydraulic, and electro-hydraulic linkage - meeting the needs of manual operation for small valves and automatic control for large valves or remote/automated control scenarios. This flexibility improves operation efficiency, enables integration into SCADA/DCS process control systems, and provides fail-safe actuation options for critical safety-related isolation service in hazardous plant environments.

6. Durable Material Selection: The valve body and internal parts can be reasonably matched according to actual working conditions, including carbon steel (ASTM A216 WCB) for general service, stainless steel (CF8, CF3, CF8M, CF3M / 304, 316, 304L, 316L) for corrosive and low-temperature service, and specialty alloys such as Monel for seawater and highly corrosive media. All materials provide high strength, pressure resistance, and corrosion resistance appropriate to their intended service, extending the valve's service life and reducing lifecycle maintenance costs. Full material traceability (MTR) is provided for every pressure-containing part.

Petroleum & Natural Gas Industry: Oil and gas exploration, gathering and transmission pipelines, refineries, natural gas processing plants, and LNG facilities, used for cutting off and connecting crude oil, natural gas, refined products, and hydrocarbon media. The API 600/API 6D compliance and wide pressure-temperature range make it the standard isolation valve for upstream, midstream, and downstream oil & gas operations, with sour service (NACE MR0175) and fire-safe (API 607) options available for critical refinery applications.

Power Generation Industry: Thermal power plants (main steam, reheat steam, feedwater, and cooling water systems), nuclear power plants (booster stations, cooling systems, and auxiliary service water), and new energy power generation (concentrated solar power, geothermal, and energy storage thermal systems), used to control steam, water, and flue gas media. The -196°C to 815°C range covers both cryogenic CO₂ capture and ultra-supercritical steam service, while the OS&Y design provides clear position indication for plant operators.

Chemical & Petrochemical Industry: High-pressure reaction kettles, chemical synthesis equipment, distillation columns, and corrosive fluid pipelines in petrochemical plants, fertilizer plants, and fine chemical facilities, suitable for various chemical media including acids, alkalis, solvents, and oxidants. The broad material selection (WCB, CF8, CF8M, CF3M, Monel) and hardfaced Stellite seats ensure compatibility with aggressive media and long reliable service in continuous chemical process environments.

Metallurgical & New Energy Industry: Blast furnace air supply systems, continuous casting machine control systems, oxygen and gas lines in steel mills, as well as new energy applications including silicon wafer production (polysilicon CVD reactors), lithium battery electrolyte transportation, and photovoltaic hydrogen production electrolyzers, meeting high-purity and high-precision control requirements. The low-flow-resistance straight-through design is particularly advantageous for gas distribution and high-purity media where pressure drop and contamination must be minimized.

Municipal, Environmental & General Industries: Sewage treatment plants (aeration systems, sludge treatment, and digester gas), urban water supply and drainage systems, natural gas distribution, and district heating pipelines. Also used in pharmaceutical pure water treatment, electronic semiconductor high-purity gas transmission, and ship/marine engineering including ship power systems and offshore platform oil and gas treatment. The broad size range (DN25–DN1000) and flange connection make it adaptable to both small-bore utility services and large-diameter municipal mains.

Every American Standard Flange Gate Valve is manufactured and tested per API 600, ANSI B16.34, ASME B16.5, API 598, ISO 9001. Raw materials MTR-verified with chemical/mechanical tests for all body materials. Castings 100% RT/UT inspected. Stem heat-treated, hardness verified. Hardfacing 100% inspected, hardness/PT verified. Flange dimensions 100% verified per ASME B16.5. OS&Y engagement verified. Valves get dimensional check, shell 1.5×, seat 1.1× per API 598. API 607 fire-safe available. Actuators tested. Units ship with MTR, test cert, 18-month warranty, BV/SGS on request.

Q1: What American standards does this valve comply with, and why do they matter?

A: Our American Standard Flange Gate Valve complies with four core American/international standards, each serving a specific purpose:

API 600 - "Steel Gate Valves for Petroleum and Natural Gas Industries": This is the primary design and manufacturing standard for bolted-bonnet steel gate valves used in oil & gas and general industrial service. It covers design, materials, manufacturing, inspection, and testing requirements, ensuring the valve is built to recognized industry quality and safety levels.

ANSI B16.34 / ASME B16.34 - "Valves-Pressure-Temperature Ratings and Dimensions": This standard defines the maximum allowable working pressure (MAWP) at each temperature for each material and pressure class, ensuring the valve is safely rated for its intended service conditions. It also covers end-to-end dimensions and wall thickness.

ASME B16.5 - "Pipe Flanges and Flanged Fittings": This standard defines flange dimensions (diameter, bolt hole circle, bolt size and quantity, raised face height, ring type joint groove dimensions) for all pressure classes, ensuring the valve flanges are physically interchangeable with any B16.5-compliant mating flange anywhere in the world.

API 6D - "Pipeline Valves": This standard applies to pipeline valves (gate, ball, check, plug) used in transmission pipeline service, with additional requirements for fire-safe design, fugitive emissions, and pipeline-specific testing. These standards matter because they guarantee: (1) Interchangeability - the valve can replace any other API 600/B16.34/B16.5 valve of the same size/class without piping modifications; (2) Safety - pressure-temperature ratings are independently verified and conservative; (3) Quality - manufacturing and testing are performed to auditable, recognized procedures; (4) Global acceptance - EPC contractors, operators, and inspection authorities worldwide recognize and accept these standards. We provide full compliance documentation and can supply valves with third-party certification (BV, SGS, TÜV) on request.

Q2: What is the difference between RF and RTJ flange connections?

A: RF (Raised Face) and RTJ (Ring Type Joint) are the two most common flange facing types for American Standard gate valves, differing in sealing mechanism and pressure capability:

RF (Raised Face): The flange face has a raised circular face (typically 1.6 mm / 1/16" high for Class 150–300, 2 mm / 3/32" for Class 400+) with a spiral-wound or serrated finish. Sealing is achieved by compressing a flat gasket (spiral-wound graphite/SS, compressed non-asbestos, or PTFE) between the two raised faces. RF flanges are standard for Class 150 through Class 600 (and sometimes Class 900) and are suitable for most general industrial services including water, steam, oil, gas, and many chemicals. They are lower cost, easier to install, and allow gasket inspection/replacement without removing the valve.

RTJ (Ring Type Joint): The flange face has a rectangular or octagonal groove (per ASME B16.5) that accepts a metallic ring gasket (typically soft iron, low-carbon steel, 304/316 stainless, or Inconel, with optional PTFE/filler for lower pressures). Sealing is achieved by the metal ring deforming into the groove faces under bolt load, creating a metal-to-metal seal. RTJ flanges are standard for Class 900 through Class 2500 high-pressure/high-temperature service, and are also used in critical oil & gas and refinery applications where leak-tightness under thermal cycling and high pressure is essential. RTJ provides superior sealing at high pressures but requires precise groove machining, proper ring gasket selection, and more careful installation (the ring must be properly seated in the groove). Selection guide: Use RF for Class 150–600 general service; use RTJ for Class 900+ and for critical high-pressure/high-temperature hydrocarbon service. Both are fully defined by ASME B16.5 and are interchangeable with any compliant mating flange of the same type and class. We can supply either facing type per your specification.

Q3: What pressure class and size range is available?

A: Our American Standard Flange Gate Valves cover the full range of ANSI pressure classes and nominal sizes:

Pressure Classes: ANSI Class 150, 300, 600, 900, 1500, and 2500. In approximate ambient-temperature pressure ratings: Class 150 ≈ 2.0 MPa (290 psi), Class 300 ≈ 5.0 MPa (740 psi), Class 600 ≈ 10.0 MPa (1480 psi), Class 900 ≈ 15.0 MPa (2220 psi), Class 1500 ≈ 25.0 MPa (3705 psi), Class 2500 ≈ 42.0 MPa (6220 psi). Note: actual MAWP decreases with increasing temperature per ANSI B16.34 pressure-temperature tables - always verify the rating at your operating temperature.

Nominal Sizes: DN25 through DN1000, equivalent to NPS 1" through NPS 36" (the page lists NPS 1/2"–36"; DN15/NPS 1/2" is available on request for small-bore service).

Size-Class Availability: Not all size-class combinations are standard - for example, Class 2500 is typically available up to DN300 (NPS 12"), while Class 150–600 are available through the full DN25–DN1000 range. Very large sizes (DN>600) and very high classes (Class 1500/2500 in large sizes) may be custom-manufactured with extended lead times.

Temperature Range: -196°C (cryogenic, requires extended bonnet and low-temperature carbon steel or stainless steel) to 815°C (high-temperature alloy steel). The actual temperature limit depends on the body material - WCB carbon steel is typically limited to ~425°C continuous, while Cr-Mo alloy steel (WC6/WC9) extends to ~593°C, and stainless/special alloys cover higher or cryogenic ranges. Please provide your specific DN/NPS, Class, operating temperature, and medium so we can confirm availability and recommend the correct configuration.

Q4: What materials are available for different media and temperatures? A: We offer a comprehensive range of body and trim materials to match specific service conditions:

Body/Bonnet Materials:

WCB (ASTM A216 Grade WCB): Carbon steel casting - the most common general-purpose material for water, steam, oil, gas at temperatures -29°C to ~425°C. Not for corrosive or cryogenic service.

CF8 / CF8M (ASTM A351): 304 / 316 austenitic stainless steel castings - for corrosive media (acids, alkalis, chemical solutions), low-temperature service down to -196°C (with proper impact testing), and high-purity applications. CF8M (316, with molybdenum) offers better pitting/crevice corrosion resistance for chlorides and marine environments.

CF3 / CF3M (ASTM A351): Low-carbon 304L / 316L stainless castings - for welded applications requiring immunity to intergranular corrosion (sensitization), and for low-temperature service.

Monel (ASTM A494 M35-1 / N-2MU): Nickel-copper alloy - for seawater, brine, hydrofluoric acid, and other highly corrosive media where stainless steel is inadequate.

Cr-Mo Steel (WC6/WC9, on request): Chromium-molybdenum alloy steel - for high-temperature steam and hydrogen service up to ~593°C.

Trim (Gate, Seat, Stem) Materials:

13Cr (AISI 410 / F6a): Martensitic stainless - standard hardfacing/base trim for general oil & gas service, good wear resistance.

Stellite (CoCr alloy, Stellite 6/21): Cobalt-chromium hardfacing overlay - premium wear, galling, and corrosion resistance for severe service and high cycling.

304 / 316 / Monel: Matching trim for corresponding body materials in corrosive service.

Stem options: F6a (13Cr), F304, F316, Monel, F304L, F316L.

Sealing/Packing: PTFE (low temp, chemical), Flexible Graphite (high temp, steam, general), EPDM (water, low temp), FKM/Viton (oil, fuel, moderate chemical). Material selection should follow NACE MR0175/ISO 15156 for sour (H2S) service, and API 607 for fire-safe requirements. We provide full MTR (Material Test Report) traceability for all pressure-containing parts and can recommend the optimal material combination for your specific medium, temperature, and pressure.

Q5: What is the difference between wedge gate and parallel gate, and OS&Y vs inside screw?

A: These are two independent design choices for gate valves:

Wedge Gate vs. Parallel Gate:

Wedge Gate: The gate disc has two inclined (wedged) sealing faces matching inclined seat faces. As the valve closes, the wedge angle forces the disc tightly against both seats, creating a self-tightening metal-to-metal seal. Sub-types: single wedge (one-piece, simple, economical), double wedge (two discs with a spacer, better adapts to seat misalignment and thermal expansion), and elastic/flexible wedge (single disc with a circumferential groove allowing slight flex, excellent thermal expansion accommodation - the most common modern design). Wedge gates provide tight bidirectional sealing and are suitable for high pressure and high temperature; they are the standard for API 600 service.

Parallel Gate: The gate has two parallel sealing faces matching parallel seat faces, typically using a spring-loaded or pressure-energized dual-disc (two discs with a spring between them) that presses outward against the seats. Parallel gates have lower operating torque (no wedging force), are less prone to thermal binding, and are preferred for low-pressure, large-diameter, and high-cycling applications (e.g., water pipelines, gas transmission). They are generally not used for very high pressure or high temperature because the sealing force is lower than a wedge.

OS&Y (Outside Screw and Yoke) vs. Inside Screw (Non-Rising Stem):

OS&Y (Rising Stem): The stem has external Acme threads engaged by a yoke nut at the top of the valve. When the handwheel turns the yoke nut, the stem rises (or lowers) through the yoke without rotating. The stem position visually indicates valve opening - fully risen = open, lowered = closed. OS&Y is the standard for API 600 gate valves because it provides clear position indication, keeps the threads out of the process medium (reducing corrosion/wear), and allows easy packing maintenance. It requires vertical clearance above the valve for stem rise.

Inside Screw (Non-Rising Stem): The stem threads are inside the valve body, engaged by the gate disc nut. The stem rotates but does not rise, so there is no visual position indication (requires a position indicator or limit switch). Inside screw is more compact (no vertical clearance needed) and is used for buried service, compact installations, and some high-pressure designs, but it is less common for API 600 general service because the threads are exposed to the medium and position is not visually apparent. For most industrial applications, an elastic wedge gate with OS&Y rising stem is the standard, most reliable, and most maintainable configuration - this is our default API 600 design. Parallel gate and inside screw are available for specific applications as required.

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