High Pressure and Temperature Check Valves
High pressure and temperature check valves are steel non-return valves sized to ASME pressure classes that automatically stop reverse flow on superheated steam, boiler feedwater and hydrocarbon lines. Swing types with a hinged disc are used on large sizes and spring-loaded piston types on small sizes.
Cast steel swing check valves are made to API 594 and BS 1868 from DN50 to DN1200 and from Class 150 to Class 1500, flanged or butt-weld. Forged steel piston check valves are offered to API 602 in 1/2″–2″ sizes with socket-weld, NPT threaded, butt-weld and flanged connections; in both types the seating faces are stellite hard-faced against wear.
Main Applications
- Boiler feed pump discharge lines
- Superheated steam and turbine lines
- Refinery and petrochemical process lines
- High-pressure compressor outlets
- Thermal oil and heat transfer oil circuits
Technical Data
| Design standard | Swing: API 594, BS 1868, API 6D · Piston: API 602, BS 5352, ASME B16.34 |
|---|---|
| Pressure class | Class 150 – Class 1500 (Class 800 and 1500 dimension tables for forged types) |
| Size range | Swing: DN50–DN1200 (2″–48″) · Piston: DN15–DN50 (1/2″–2″) |
| Connection | Flanged ASME B16.5 RF · butt-weld ASME B16.25 · socket-weld ASME B16.11 · NPT thread |
| Face-to-face | ASME B16.10; e.g. Class 150 DN100: 292 mm · Class 600 DN100: 432 mm |
| Cast body temperature | WCB −29 / +425 °C · WC6 −29 / +595 °C · LCB −46 / +345 °C · CF8M −196 / +600 °C |
| Forged body temperature | A105 −29 / +425 °C · F22 −29 / +595 °C · F316 −196 / +538 °C |
| Allowable pressure (WCB) | Class 150: 19.6 bar (−29/30 °C) · Class 600: 102.1 bar · Class 600 at 400 °C: 69.4 bar |
| Allowable pressure (forged A105, Class 800) | 136.2 bar (−29/38 °C) · 92.6 bar (400 °C) |
| Piston type length (Class 800) | 79 mm (1/2″) … 172 mm (2″) |
| Bonnet | Bolted bonnet (BB); welded bonnet (WB) option on forged types |
| Test | API 598 |
Material Options
| Part | Class 150–600 · cast WCB swing | Class 150–1500 · cast WC6 swing | API 602 · forged A105 piston | API 602 · forged F22 piston |
|---|---|---|---|---|
| Body | ASTM A216 WCB | ASTM A217 WC6 | ASTM A105 + stellited seat | ASTM A182 F22 + stellited seat |
| Bonnet | ASTM A216 WCB | ASTM A217 WC6 | ASTM A105 | ASTM A182 F22 |
| Disc | A216 WCB + 13Cr overlay | A217 WC6 + stellite | ASTM A182 F6A | ASTM A182 F6A + stellite |
| Seat | A105 + stellite | A217 WC6 + stellite | Machined in body | Machined in body |
| Arm / spring | Arm: A216 WCB | Arm: A217 WC6 | Spring: ASTM A276 410 | Spring: ASTM A276 410 |
| Bonnet gasket | SS304 + graphite | SS304 + graphite | SS304 + graphite | SS304 + graphite |
| Bonnet bolt / nut | A193 B7 / A194 2H | A193 B16 / A194 4 | A193 B7 | A193 B16 |
Which type? On high-pressure lines of 2″ and below choose the compact forged piston check valve; on DN50 and larger main lines choose the low-pressure-drop swing type. Carbon steel (WCB, A105) is suitable up to 425 °C; higher temperatures require chromium-molybdenum (WC6, F22) bodies. On flanged types use temperature-rated spiral wound gaskets.
Advantages
Self-Acting
- The disc or piston closes when the flow reverses.
- No external energy or actuation needed.
Stellited Seat
- Disc and seat faces are hard-faced by welding.
- Long life with erosive steam and high velocity.
Wide Material Choice
- Carbon, Cr-Mo, low-temperature and stainless bodies.
- Applications from cryogenic up to 600 °C.
Easy Maintenance
- Disc and arm reached through the bolted bonnet.
- The disc can be renewed in line.
Tested
- Every valve is tested to API 598.
- Delivered with documented tightness.
Construction and Design Features
- Swing type: arm pinned to the body and hinged disc
- Arm pin secured with disc nut and yoke
- Piston type: guided disc pressed onto the seat by a spring
- SS + graphite wound bonnet gasket
- Eye bolt for lifting (cast types)
Send the pressure class, size, connection type, medium and design temperature through the Request a Quote form; we will define the check valve with the right body and trim material together.
How to Choose?
- Choose the type by sizePrefer the piston type for 2″ and below and the swing type for DN50 and above.
- Determine the pressure classCheck the allowable pressure at design temperature in the ASME table.
- Select the body materialAbove 425 °C move to a Cr-Mo body such as WC6 or F22.
- Match the connectionSelect flanged, butt-weld, socket-weld or NPT to suit the pipeline.
- Check the installation positionInstall the valve following the arrow on the body and in the position stated in the manufacturer’s manual.
Complementary Products
Why ORFA?
Other High Pressure and High Temperature Valves
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High Pressure and Temperature Globe Valves
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High Pressure and Temperature Butterfly Valves
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High Pressure and Temperature Ball Valves
High pressure and temperature ball valves provide quick and tight shut-off under severe process conditions.
Details →Our High Pressure and Temperature Check Valves
ORFA supplies high pressure and temperature check valves in a range of pressure classes, sizes and connection types to suit your application. Descriptions, technical specifications, materials and dimension tables are available on each detail page.
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