Pressure Seal Check Valve for High Pressure Steam and Power Plant Service
Pressure Seal Check Valve for High Pressure Steam and Power Plant ServicePressure Seal Check Valve is designed for high-temperature and high-pressure pipelines where reverse flow protection, pressure seal cover performance and seat durability are critical. It is commonly used in steam, boiler, power plant, refinery, thermal oil and high-pressure process systems.
Vcore Valve supplies pressure seal check valves according to project requirements, including valve size, pressure class, body material, disc design, seat material, pressure seal cover structure, end connection, testing standard and required documents.
| Product Type | Pressure Seal Check Valve |
| Valve Function | Non-return protection and backflow prevention in high-pressure pipelines |
| Design Type | Swing type, lift type or project-specified check valve design |
| Size Range | NPS 2″–24″ / DN50–DN600, or project-specified size |
| Pressure Rating | Class 600, Class 900, Class 1500, Class 2500 or project-specified pressure class |
| Body Material | WCB, WC6, WC9, C12A, F11, F22, F91, stainless steel or project-specified alloy steel |
| Disc / Seat Material | 13Cr, stainless steel, alloy steel, Stellite hardfacing or project-specified trim |
| Cover Design | Pressure seal cover |
| End Connection | Butt weld, flanged RF, flanged RTJ or project-specified connection |
| Testing | Shell test, seat leakage test, dimensional inspection and project-required tests |
| Documents | MTC, pressure test report, inspection report, drawing, packing photos and project documents if required |
Key Features
- Pressure seal cover design for high-pressure service
- Designed for high-temperature steam, boiler and power plant pipelines
- Swing check or lift check construction available according to project requirements
- Alloy steel, stainless steel or project-specified body material available
- Hardfaced disc and seat options for high-temperature and severe service
- Butt weld, RF flange or RTJ flange end connections available
- Suitable for preventing reverse flow in steam, boiler feedwater and thermal process lines
- Factory pressure testing and inspection documents available before shipment
Typical Applications
Typical ApplicationsPressure seal check valves are selected where the pipeline requires automatic non-return protection under high pressure, high temperature or severe thermal cycling conditions.
- Main steam and auxiliary steam pipelines
- Boiler feedwater systems
- High-pressure water and steam lines
- Power plant high-temperature process systems
- Refinery and petrochemical high-pressure pipelines
- Thermal oil and high-temperature utility systems
- Superheated steam and high-pressure process service
For broader power and steam valve selection, see our Power & Steam Valve Solutions.
Pressure Seal Cover Design
The pressure seal cover design is used for high-pressure service where internal pressure helps improve the cover joint sealing. This structure is commonly selected for high-pressure steam, boiler and power plant check valve applications.
- Pressure-assisted cover sealing structure
- Suitable for high-pressure and high-temperature service
- Graphite or project-specified pressure seal gasket
- Designed for severe pressure-temperature conditions
- Available with flanged or butt-weld pipeline connections
Swing Type and Lift Type Options
Pressure seal check valves can be supplied with swing type or lift type construction depending on installation direction, flow condition, pressure drop, reverse flow risk and project specification.
| Design Type | Typical Use | Buyer Notes |
|---|---|---|
| Swing Type Pressure Seal Check Valve | Horizontal pipelines and larger flow applications | Suitable where full-flow non-return protection is required |
| Lift Type Pressure Seal Check Valve | High-pressure lines with controlled disc movement | Installation direction and minimum flow condition should be confirmed |
| Project-Specified Design | Power plant, boiler or refinery service | Disc design, seat material and pressure-temperature rating should be reviewed together |
Pressure Seal Check Valve vs Bolted Cover Check Valve
| Item | Pressure Seal Check Valve | Bolted Cover Check Valve |
|---|---|---|
| Cover Structure | Pressure seal cover | Bolted cover with gasket compression |
| Typical Service | High pressure and high temperature | General industrial service |
| Common Pressure Class | Class 600, 900, 1500, 2500 | Low to medium pressure classes are common |
| Common Applications | Steam, boiler, power plant and refinery service | Water, oil, gas and general process pipelines |
| Selection Focus | Pressure-temperature rating, cover sealing and disc-seat durability | General backflow prevention and installation convenience |
Material and Seat Options
Material selection should be based on design pressure, design temperature, medium, corrosion, erosion, flow velocity and project standard. For high-temperature steam service, alloy steel materials and hardfaced seating surfaces are commonly reviewed.
| Part | Common Options | Selection Focus |
|---|---|---|
| Body / Cover | WCB, WC6, WC9, C12A, F11, F22, F91, stainless steel | Pressure-temperature rating and service condition |
| Disc | 13Cr, stainless steel, alloy steel, Stellite hardfacing | Reverse flow impact, shutoff performance and wear resistance |
| Seat Ring | Integral seat, welded seat, threaded seat, hardfaced seat | Leakage requirement, sealing durability and maintenance |
| Hinge / Pin | Stainless steel, alloy steel or project material | Disc movement, wear resistance and high-temperature stability |
| Pressure Seal Gasket | Graphite, stainless steel graphite composite or project-specified seal | Cover sealing under high pressure and high temperature |
| Bolting | A193 B7, B16, B8, B8M, L7 or project-specified bolting | Pressure joint strength, temperature and project specification |
For high-temperature material selection, see our WC6 vs WC9 Valve Material guide.
End Connection Options
Pressure seal check valves can be supplied with butt weld ends or flanged ends according to pipeline design and project specification.
| End Connection | Available Configuration | Buyer Notes |
|---|---|---|
| Butt Weld End | Welded-end connection for high-pressure pipelines | Confirm pipe schedule, weld end preparation and material compatibility |
| Flanged RF | Raised face flanged connection | Confirm flange standard, gasket and bolting requirement |
| Flanged RTJ | Ring type joint flanged connection | Confirm RTJ groove, ring gasket and pressure class |
Testing and Inspection
Each pressure seal check valve can be inspected and tested according to the applicable valve standard, purchase order and project specification. Required documents should be confirmed before production.
- Material verification
- Dimensional inspection
- Pressure seal cover component inspection
- Shell pressure test
- Seat leakage test
- Disc movement inspection
- Hinge and pin inspection where applicable
- PMI inspection if required
- Final visual inspection before packing
Available Documents
- Material Test Certificate / MTC
- Pressure test report
- Dimensional inspection report
- PMI report if required
- Drawing / GA drawing
- Inspection photos
- Packing photos
- Third-party inspection support if required
Selection and RFQ Checklist
To quote the correct pressure seal check valve, please provide the main project parameters before quotation.
| Valve Size | DN / NPS |
| Pressure Class | Class 600, 900, 1500, 2500 or project rating |
| Design Type | Swing type, lift type or project-specified check valve design |
| Design Pressure | Maximum design pressure of the pipeline |
| Design Temperature | Maximum and minimum design temperature |
| Medium | Steam, hot water, boiler feedwater, thermal oil or other medium |
| Body Material | WCB, WC6, WC9, C12A, F11, F22, F91 or project material |
| Disc / Seat Material | 13Cr, stainless steel, Stellite hardfacing or project material |
| End Connection | Butt weld, flanged RF, flanged RTJ or project connection |
| Flow Direction | Required for check valve installation and inspection |
| Documents | MTC, test report, drawing, inspection report and packing documents |
Related Products and Resources
- Pressure Seal Gate Valve — for high-pressure steam isolation where full-bore gate valve structure is required.
- Pressure Seal Globe Valve — for high-pressure steam shut-off and controlled flow adjustment service.
- Nozzle Check Valve — for fast-closing non-slam check valve applications where water hammer control is important.
- Power & Steam Valve Solutions — for boiler, steam, feedwater and high-temperature valve applications.
- High Temperature High Pressure Valves — for high-temperature and high-pressure valve material, seat and sealing selection.
FAQ
What is a pressure seal check valve?
A pressure seal check valve is a check valve with a pressure seal cover structure. It is used for high-pressure and high-temperature service where reverse flow protection and cover joint sealing are important.
Where are pressure seal check valves used?
They are commonly used in steam, boiler, power plant, refinery, petrochemical, thermal oil and other high-pressure process pipelines.
What is the difference between a pressure seal check valve and a bolted cover check valve?
A pressure seal check valve uses a pressure-assisted cover sealing structure, while a bolted cover check valve mainly relies on bolting and gasket compression.
Can pressure seal check valves be supplied with butt weld ends?
Yes. Butt weld, flanged RF and flanged RTJ end connections can be supplied according to project requirements.
What materials are available?
Common materials include WCB, WC6, WC9, C12A, F11, F22, F91, stainless steel and project-specified alloy steel. Final selection depends on pressure, temperature, medium and project standard.
What information is needed for quotation?
Please provide valve size, pressure class, design type, design pressure, design temperature, medium, body material, disc and seat material, end connection, flow direction, required documents and quantity.