Pressure Seal Globe Valve for High Pressure Steam and Power Plant Service
Pressure Seal Globe Valve is designed for high-temperature and high-pressure pipelines where reliable shut-off, bonnet sealing and trim durability are critical. It is commonly used in steam, boiler, power plant, refinery, thermal oil and severe process systems.
Vcore Valve supplies pressure seal globe valves according to project requirements, including size, pressure class, body material, trim material, pressure seal bonnet structure, end connection, operation method, testing standard and required documents.
| Product Type | Pressure Seal Globe Valve |
| Valve Function | Shut-off, isolation and controlled flow adjustment |
| 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 |
| Trim Material | 13Cr, stainless steel, Stellite hardfacing, alloy steel or project-specified trim |
| Bonnet Design | Pressure seal bonnet |
| End Connection | Butt weld, flanged RF, flanged RTJ or project-specified connection |
| Operation | Handwheel, gearbox, electric actuator or pneumatic actuator |
| Testing | Shell test, seat test, backseat 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 bonnet design for high-pressure service
- Suitable for high-temperature steam, boiler and power plant pipelines
- Available with alloy steel, stainless steel or project-specified body material
- Hardfaced disc and seat options for severe service
- Graphite packing and high-temperature sealing options
- Butt weld, RF flange or RTJ flange end connections available
- Manual, gear, electric or pneumatic operation available
- Factory pressure testing and inspection documents available before shipment
Typical Applications
Typical ApplicationsPressure seal globe valves are selected when the valve must operate under high pressure, high temperature or severe thermal cycling conditions. They are especially suitable for power plant and steam system applications.
- Main steam and auxiliary steam pipelines
- Boiler feedwater systems
- High-pressure drain and vent lines
- Power plant high-temperature process lines
- Refinery and petrochemical high-pressure pipelines
- Thermal oil and high-temperature utility systems
- Superheated steam and high-pressure water service
For broader power and steam valve selection, see our Power & Steam Valve Solutions.
Pressure Seal Bonnet Design
The pressure seal bonnet design is used for high-pressure service where internal pressure helps improve bonnet joint sealing. This structure is commonly selected for steam, boiler and power plant pipelines.
- Pressure-assisted bonnet sealing structure
- Suitable for high-pressure and high-temperature service
- Graphite or project-specified pressure seal gasket
- Designed for severe pressure-temperature conditions
- Suitable for flanged or butt-weld pipeline connections
Pressure Seal Globe Valve vs Bolted Bonnet Globe Valve
| Item | Pressure Seal Globe Valve | Bolted Bonnet Globe Valve |
|---|---|---|
| Bonnet Structure | Pressure seal bonnet | Bolted bonnet 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, steam and general process lines |
| Selection Focus | Pressure-temperature rating, bonnet sealing and trim durability | General shut-off, installation and maintenance |
Material and Trim Options
Material selection should be based on design pressure, design temperature, medium, corrosion, erosion, pressure drop and project standard. For high-temperature steam service, alloy steel body materials and hardfaced trim are commonly reviewed.
| Part | Common Options | Selection Focus |
|---|---|---|
| Body / Bonnet | WCB, WC6, WC9, C12A, F11, F22, F91, stainless steel | Pressure-temperature rating and service condition |
| Disc | 13Cr, stainless steel, alloy steel, Stellite hardfacing | Shut-off performance and erosion resistance |
| Seat Ring | Integral seat, welded seat, threaded seat, hardfaced seat | Leakage requirement and sealing durability |
| Stem | 13Cr, stainless steel, alloy steel or project material | Strength, corrosion resistance and packing compatibility |
| Packing | Flexible graphite, graphite packing, low-emission packing if required | Stem sealing and external leakage control |
| Pressure Seal Gasket | Graphite, stainless steel graphite composite or project-specified seal | Bonnet sealing under high pressure and high temperature |
For high-temperature material selection, see our WC6 vs WC9 Valve Material guide.
End Connection and Operation
Pressure seal globe valves can be supplied with butt weld ends or flanged ends according to pipeline design and project specification.
| Option | Available Configuration | Buyer Notes |
|---|---|---|
| End Connection | Butt weld, flanged RF, flanged RTJ | Confirm pipe schedule, flange standard, face type and gasket requirement |
| Manual Operation | Handwheel or gearbox | Suitable for accessible valves and normal manual operation |
| Electric Operation | Electric actuator | Confirm voltage, control signal, torque, travel and enclosure requirement |
| Pneumatic Operation | Pneumatic actuator | Confirm air supply pressure, fail position and accessories |
Testing and Inspection
Each 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
- Shell pressure test
- Seat leakage test
- Backseat test where applicable
- Pressure seal bonnet component inspection
- Stem packing inspection
- 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 globe valve, please provide the main project parameters before quotation.
| Valve Size | DN / NPS |
| Pressure Class | Class 600, 900, 1500, 2500 or project rating |
| 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 |
| Trim Material | 13Cr, stainless steel, Stellite hardfacing or project material |
| End Connection | Butt weld, flanged RF, flanged RTJ or project connection |
| Operation | Handwheel, gearbox, electric actuator or pneumatic actuator |
| 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.
- Steam Globe Valve — for general steam shut-off and flow adjustment service.
- Bellows Globe Valve — for applications where stem leakage control is critical.
- High Temperature High Pressure Valves — for high-temperature and high-pressure valve material, seat and sealing selection.
FAQ
What is a pressure seal globe valve?
A pressure seal globe valve is a globe valve with a pressure seal bonnet structure. It is commonly used for high-pressure and high-temperature service where bonnet joint sealing is critical.
Where are pressure seal globe 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 globe valve and a bolted bonnet globe valve?
A pressure seal globe valve uses a pressure-assisted bonnet sealing structure, while a bolted bonnet globe valve mainly relies on bolting and gasket compression.
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.
Can pressure seal globe 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 information is needed for quotation?
Please provide valve size, pressure class, design pressure, design temperature, medium, body material, trim material, end connection, operation method, required documents and quantity.