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Technical Datasheet -- High-Pressure High-Temperature Pressure Seal Globe Valves
Pressure seal bonnet globe valves for high-pressure high-temperature steam and process service. Bonnet seal gasket is compressed by internal line pressure -- the higher the pressure, the tighter the seal, eliminating leak paths common in bolted bonnet designs at high pressure (Class 900 to Class 2500). Y-pattern body (45-degree angle) provides 40--60% lower pressure drop than T-pattern. ASTM A217 WC6/WC9 body and disc with Stellite 6 seat overlay. Backseat design for in-line packing replacement. Live-loaded graphite packing. API 600 / ASME B16.34 compliant.
| Parameter | Specification |
|---|---|
| Product Type | Pressure Seal Globe Valves |
| Category | Globe 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) / ASTM A351 CF8M (SS316, corrosive) |
| Disc Material | ASTM A217 WC6 with Stellite 6 overlay on seating surface / SS316 disc with Stellite overlay / SS316 with PTFE insert (soft seat, on request for lower pressure) |
| Seat Material | ASTM A217 WC6 with Stellite 6 overlay / renewable SS316 + Stellite seat insert / SS316 with PTFE insert (soft seat, on request) |
| 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 |
| Bonnet Type | Pressure seal bonnet with yoke and stem guide -- OS&Y rising stem |
| Face-to-Face | ASME B16.10 |
| Pattern | Y-pattern (45-degree body angle, low pressure drop) -- T-pattern on request |
| 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) |
| Component | Material |
|---|---|
| Carbon Steel | ASTM A216 WCB body and disc (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) body, disc, and stem (corrosive / high-temp service > 425 deg C) |
| Seat Overlay | Stellite 6 on WC6/WC9/SS316 seat for erosion and galling resistance at high temperature and high velocity |
| Bonnet Gasket | Graphite / SS316 spiral wound or solid SS316 pressure seal ring |
| 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 |
| Standard | Description |
|---|---|
| Design Standard | API 600 Steel Gate/Globe Valves, ASME B16.34, API 598 |