High Pressure and Temperature Gate Valves
High pressure and temperature gate valves are steel shut-off valves that fully open and close the line with a wedge or gate that hardly narrows the flow path when fully open. They work in on-off duty on main steam, feedwater and process lines and are not suitable for throttling in an intermediate position.
Two constructions exist: cast steel bodied flanged or butt-weld types to API 600 for 2″ and larger, and compact forged steel bodied types to API 602 for 1/2″–2″. Forged types may be socket-weld, NPT threaded, butt-weld or flanged; both types use graphite packing and an SS + graphite bonnet gasket.
Main Applications
- Boiler main steam outlets and steam headers
- Boiler feedwater and economiser lines
- Power plant auxiliary steam lines
- Refinery hydrocarbon transfer lines
- High-pressure instrument and drain connections (forged type)
Technical Data
| Design standard | Cast: API 600 · Forged: API 602, BS 5352, ASME B16.34 |
|---|---|
| Size range | Cast: DN50–DN1200 · Forged: DN15–DN50 |
| Pressure class | Class 150 – Class 1500 |
| Connection (cast) | Flanged ASME B16.5 RF · butt-weld ASME B16.25 |
| Connection (forged) | Socket-weld ASME B16.11 · NPT ASME B1.20.1 · butt-weld · flanged |
| Face-to-face (cast) | ASME B16.10; e.g. Class 300 DN100: 305 mm · Class 600 DN150: 559 mm |
| Body length (forged, Class 800) | 79 mm (1/2″) · 92 · 111 · 120 · 120 · 140 mm (2″) |
| Height (forged, Class 800) | 161 mm (1/2″) … 290 mm (2″) |
| Body temperature | WCB / A105: −29 / +425 °C · WC6 / F22: −29 / +595 °C · F316: −196 / +538 °C |
| Wedge | Flexible or solid |
| Bonnet | Bolted (BB); welded (WB) option on forged types |
| Test | API 598 |
Material Options
| Part | API 600 · cast WCB | API 600 · cast WC6 | API 602 · forged A105 | API 602 · forged F22 |
|---|---|---|---|---|
| Body / bonnet | ASTM A216 WCB | ASTM A217 WC6 | ASTM A105 | ASTM A182 F22 |
| Seat | A105 + stellite | A217 WC6 + stellite | A276 410 + stellite | A276 410 + stellite |
| Wedge / disc | A216 WCB + 13Cr | A217 WC6 + stellite | ASTM A182 F6A | A182 F6A + stellite |
| Stem | ASTM A276 410 | ASTM A276 410 | ASTM A276 410 | ASTM A276 410 |
| Back seat | ASTM A276 410 | ASTM A217 WC6 | — | — |
| Packing | Graphite | Graphite | Graphite | Graphite |
| Bonnet gasket | SS304 + graphite | SS304 + graphite | SS304 + graphite | SS304 + graphite |
| Bonnet bolting | A193 B7 / A194 2H | A193 B16 / A194 4 | A193 B7 | A193 B16 |
| Stem bush | A536 ductile iron | A536 ductile iron | A276 410 | A276 410 |
Cast or forged? Choose a forged body for high-pressure branch, drain and instrument lines of 2″ and below, and a cast body for main lines and large sizes. On superheated steam lines above 425 °C, a Cr-Mo (WC6 / F22) body is required instead of carbon steel. On large, frequently operated sizes, valve gearboxes or electric actuators can be used instead of a handwheel.
Advantages
Full Bore
- The wedge leaves the flow path when open.
- Very low pressure drop on main lines.
Connection Variety
- Flanged, butt-weld, socket-weld and NPT options.
- Ends are chosen to suit the existing pipeline.
Hard Seating
- Stellited seats and 13Cr / stellite wedge.
- Wear resistance at high temperature.
Packing Renewal
- Back-seated cast types give access to the packing when fully open.
- Maintenance is easier to plan.
Compact Forged Type
- Short body length in 1/2″–2″.
- High-pressure shut-off in tight spaces.
Construction and Design Features
- Outside screw and yoke (OS&Y) rising stem
- Flexible or solid wedge, stellited seat rings
- Gland flange with eye bolts and graphite packing
- SS + graphite wound bonnet gasket and studded bonnet
- Stem bush with grease nozzle on cast types
Send the size, pressure class, connection, medium and design temperature through the Request a Quote form; we will quote a cast or forged gate valve with the right trim.
How to Choose?
- Confirm the dutyMake sure the valve will operate only fully open or fully closed.
- Choose construction by sizeConsider forged for 1/2″–2″ and cast for 2″ and above.
- Determine the pressure classFind the allowable pressure at design temperature in the ASME table.
- Select the materialAbove 425 °C move to a WC6 or F22 body.
- Plan the operationAdd a gearbox or actuator for large sizes and frequent use.
Complementary Products
Why ORFA?
Other High Pressure and High Temperature Valves
High Pressure and Temperature Check Valves
High pressure and temperature check valves prevent backflow under severe conditions in steam and process lines.
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High Pressure and Temperature Globe Valves
High pressure and temperature globe valves are used for shut-off and throttling in steam and process lines under severe conditions.
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High Pressure and Temperature Butterfly Valves
High pressure and temperature butterfly valves are used in steam and hot process lines with metal seated designs.
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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 Gate Valves
ORFA supplies high pressure and temperature gate 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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