Pressure Seal Gate Valve -- ASME B16.34 WCB/WC6
Technical Datasheet -- High-Pressure High-Temperature Gate Valves with Pressure Seal Bonnet
Document No.SV-DATA-PSGV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Pressure seal bonnet gate valves for high-pressure high-temperature steam and process service. The pressure seal bonnet gasket is compressed by internal line pressure -- seal tightness increases with pressure, eliminating leak paths common in bolted bonnet designs. Available in wedge or parallel slide disc patterns. ASME B16.34 / API 600 compliant. Class 900 to Class 2500.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Pressure Seal Gate Valves |
| Category | Gate Valves |
| Size Range | 2" to 24" (DN50 to DN600) |
| Pressure Class | Class 900 / Class 1500 / Class 2500 per ASME B16.5 |
| End Connections | RF / RTJ flanged per ASME B16.5 or butt-weld per ASME B16.25 |
| Body Material | ASTM A216 WCB (up to 425 deg C) / ASTM A217 WC6 (up to 540 deg C) / ASTM A217 WC9 (up to 595 deg C) |
| Wedge / Disc | ASTM A217 WC6 with Stellite 6 overlay on seating surface |
| Seat Material | ASTM A217 WC6 with Stellite 6 overlay -- metal-to-metal seal |
| Stem Material | ASTM A276 410 / SS316 with anti-blowout design |
| Bonnet Seal | Pressure seal bonnet with graphite / SS316 gasket -- seal tightness increases with internal pressure |
| Face-to-Face | ASME B16.10 long pattern |
| Operation | Handwheel (up to 8 inch) / Impact handwheel (10-12 inch) / Gear operator (14 inch and above) / Actuator |
| Leakage Class | API 598 / EN 12266-1 -- metal seated standard leakage acceptable; zero visible for pressure seal bonnet joint |
| Temperature Range | Up to +425 deg C (WCB) -- up to +540 deg C (WC6) -- up to +595 deg C (WC9) |
Materials of Construction
| Component | Material |
|---|
| Carbon Steel | ASTM A216 WCB (up to 425 deg C) |
| Alloy Steel | ASTM A217 WC6 (up to 540 deg C), WC9 (up to 595 deg C) |
| Stainless Steel | ASTM A351 CF8M (SS316) -- corrosive high-pressure service |
| Seat Overlay | Stellite 6 on WC6/WC9 seat ring for erosion and galling resistance at high temperature |
| Bonnet Gasket | Graphite / SS316 spiral wound or solid SS316 pressure seal ring |
Testing & Inspection
| Test | Requirement |
|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test per API 598 / EN 12266-1; Functional test -- full stroke, torque; Material certificates per EN 10204 3.1 |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | API 600 Steel Gate Valves, ASME B16.34, API 598 |
Notes
- Disc type (wedge or parallel slide) and pressure class must be specified by the purchaser.
- Maximum operating temperature determines body material: WCB (425 deg C), WC6 (540 deg C), WC9 (595 deg C).
- For frequent thermal cycling service, parallel slide disc is strongly recommended over wedge to prevent thermal binding.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
