Cast Steel Gate Valve - ANSI Class 900Lb - API 600, 2" to 24"
We supply ANSI Class 900Lb Cast Steel Gate Valve as a professional manufacturer and supplier, engineered for ultra-high-pressure and extreme temperature service conditions where Class 150, 300, and 600 designs are inadequate. Manufactured in accordance with API 600 and API 6D, this cast steel gate valve features rising stem OS&Y, bolted bonnet construction, and flexible wedge design with maximum wall thickness for superior pressure containment at elevated temperatures. Available in sizes 2″ to 24″ (DN50 to DN600) with pressure rating ANSI Class 900Lbs (CL900) — the preferred choice for high-pressure steam systems, refinery processes, chemical plants, power generation, and critical oil & gas applications where safety and reliability are paramount. End connections include flanged (RF, RTJ) and butt weld (BW) — RTJ flange facing is recommended for enhanced sealing integrity in ultra-high-pressure services. Materials include carbon steel (WCB, LCB), stainless steel (CF8, CF8M, CF3, CF3M), alloy steel (WC6, WC9, C5, C12), and duplex stainless steel (4A, 5A). Actuation options include manual handwheel, gearbox operated (recommended for 8″ and above), and bare stem for electric actuator.
Cast Steel Gate Valve Specification for Class 900Lb
• Design & Manufacture: ANSI B16.34, API 600, API 6D
• Construction: Outside Screw and Yoke (OS&Y), Bolted Bonnet, Solid or Flexible Wedge Design — heavy-duty construction with maximum wall thickness for ultra-high-pressure service
• Size Range: 2″ to 24″ (DN50 to DN600)
• Pressure Rating: ANSI Class 900Lbs (CL900) — designed for ultra-high-pressure and extreme temperature critical service
• End Connections: Flanged (RF, RTJ), Butt Weld (BW) — RTJ facing recommended for ultra-high-pressure sealing integrity
• Body Materials: WCB, LCB, CF8, CF8M, CF3, CF3M, WC6, WC9, C5, C12, 4A, 5A or Equivalent
• Trim Materials: Various trim materials are available to suit different service conditions
• Actuator Type: Manual Handwheel, Gearbox Operated (recommended for 8″ and above), Electric Actuator (Bare Stem)
• Sour Service: NACE MR 0175 on Request
✓ Designed for ultra-high-pressure critical applications — maximum safety factor, RTJ options, and pressure integrity
Gate Valve 900LBS Main Parts and Materials
| Part Name | Material | ||
|---|---|---|---|
| Carbon Steel (WCB) | Stainless Steel (CF8 / CF8M) | Alloy Steel (WC6 / WC9) | |
| Body | A216 WCB | A351 CF8 / CF8M | A217 WC6 / WC9 |
| Bonnet | A216 WCB | A351 CF8 / CF8M | A217 WC6 / WC9 |
| Wedge / Disc | WCB + 13Cr / STL | CF8 / CF8M | WC6 / WC9 + 13Cr / STL |
| Seat | 13Cr / STL | SS304 / SS316 | 13Cr / STL |
| Stem | A182 F6a / F304 / F316 | A182 F304 / F316 | A182 F6a / F304 / F316 |
| Bolts / Nuts | A193 B7 / A194 2H | A193 B8 / A194 8, B8M / 8M | A193 B7 / A194 2H |
| Gasket | Graphite / PTFE | Graphite / PTFE | Graphite / PTFE |
| Packing | Graphite / PTFE | Graphite / PTFE | Graphite / PTFE |
Reference: API 600, API 6D, ANSI B16.34. Materials may vary by model and pressure rating. Contact us for confirmed material certificate.
Cast Steel Gate Valve Dimensions - ANSI Class 900Lb
| NPS (inch) | DN (mm) | L (RF) mm | L1 (BW) mm |
|---|---|---|---|
| 2 | 50 | 368 | 368 |
| 2 1/2 | 65 | 419 | 419 |
| 3 | 80 | 381 | 381 |
| 4 | 100 | 457 | 457 |
| 6 | 150 | 610 | 610 |
| 8 | 200 | 737 | 737 |
| 10 | 250 | 838 | 838 |
| 12 | 300 | 965 | 965 |
| 14 | 350 | 1029 | 1029 |
| 16 | 400 | 1130 | 1130 |
| 18 | 450 | 1219 | 1219 |
| 20 | 500 | 1321 | 1321 |
| 24 | 600 | 1549 | 1549 |
Reference: API 600, API 6D, ANSI B16.10. Dimensions may vary by manufacturer. Contact us for confirmed drawing and quotation.
Reference Drawing: Cast Steel Gate Valve Class 900Lb Dimensions.
Industrial Gate Valve Dimension Details
Typical Applications of 900Lb Cast Steel Gate Valve
• Ultra-high-pressure steam systems: power plant main steam, reheat, and turbine bypass lines.
• Refinery high-pressure processes: hydrocracking, hydrotreating, and catalytic reforming lines.
• Oil & gas wellhead and manifold: high-pressure gathering, transmission, and wellhead pipelines.
• Chemical plants: high-pressure synthesis and corrosive media with CF8M / alloy options.
• Power generation: boiler feedwater and high-energy piping systems.
• Critical service with RTJ facing: enhanced sealing integrity for ultra-high-pressure and high-temperature applications.
FAQ - Cast Steel Gate Valve ANSI Class 900Lb
Q1: What is a Class 900Lb cast steel gate valve?
A: A Class 900Lb cast steel gate valve is a linear motion valve designed for ultra-high-pressure and high-temperature on-off service. It uses a wedge-shaped disc that slides up and down to open or close the flow path. It is manufactured to API 600 / API 6D / ANSI B16.34 and is rated for ANSI Class 900 (approximately PN150) pressure.
Q2: What is the difference between Class 600 and Class 900 gate valves?
A: Class 900 gate valves have thicker wall sections, heavier flanges, and higher pressure/temperature ratings than Class 600. They are suitable for ultra-high-pressure steam, hydrocracking, wellhead, and other critical high-pressure services. Class 600 is preferred for high-pressure general industrial applications up to PN100.
Q3: Why is RTJ facing recommended for Class 900 gate valves?
A: RTJ (Ring Type Joint) uses a metal ring gasket in a grooved flange facing, providing superior sealing integrity under ultra-high pressure and temperature. RF (Raised Face) may not be sufficient for Class 900 and above in critical service. RTJ is the standard choice for Class 900 and higher pressure ratings.
Q4: What materials are available for 900Lb gate valves?
A: Common body materials include WCB, LCB, CF8, CF8M, CF3, CF3M, WC6, WC9, C5, C12, 4A, and 5A. Various trim materials such as 13Cr, STL, SS304, SS316, and F6a are available to suit different service conditions.
Q5: What actuation options are available?
A: Actuation options include manual handwheel, gearbox operated (recommended for 8″ and above), and bare stem for electric actuator. Other options are available on request.
Q6: Is NACE MR 0175 available for 900Lb gate valves?
A: Yes. NACE MR 0175 compliance is available on request for sour service applications. Please specify this requirement when requesting a quotation.
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Email: sales@tengsvalve.com
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