Self-energising pressure seal bonnet enables reliable throttling and isolation in supercritical steam and high-pressure process service.
The pressure seal globe valve combines the flow regulation capability of the globe valve geometry with the self-energising bonnet seal required for reliable performance at Class 900 and above. As line pressure increases, the internal pressure acting on the bonnet sealing ring increases bonnet clamping force — creating a valve that becomes inherently tighter as the process becomes more demanding.
VALVAX pressure seal globe valves are specified for supercritical power plant bypass and desuperheating service, high-pressure steam letdown stations, and HP/LP bypass systems. The Y-pattern body configuration provides a straight-through flow path for low pressure drop and reduced erosion in high-velocity steam service.
| Parameter | Value |
|---|---|
| Design Standard | ASME B16.34 |
| Size Range | 2″ – 12″ (DN50 – DN300) |
| Pressure Class | ASME Class 900 – 2500 |
| Face to Face | ASME B16.10 |
| End Connections | BW / RTJ / RF |
| Body Material | WCB / WC6 / WC9 / CF8M / P91 |
| Disc / Stem | 13Cr / SS316 / Alloy 625 HF |
| Seat Ring | Integral / Stellite 6 HF |
| Design Temp. | Up to 650°C (P91) |
| Testing | API 598 / IBR |
ASTM A216 WCB / ASTM A105
High-pressure gas and water service at Class 900–2500 at moderate temperatures.
ASTM A217 WC6
Elevated temperature steam throttling and desuperheating service in conventional power plants.
P91 Grade
Ultra-supercritical steam at temperatures above 600°C in advanced USC power plants.
ASTM A351 CF8M
High-pressure corrosive service and cryogenic applications at Class 900–1500.
HP/LP bypass systems, desuperheating stations, and main steam throttling in supercritical power plants.
High-pressure hydrogen, steam, and process stream throttling at Class 1500 and 2500.
Pressure and temperature reduction stations where steam passes from supercritical to subcritical conditions.
High-pressure process flow regulation in ethylene crackers and polymerisation reactors.
High-pressure wellstream choke and bypass service on FPSO and platform topsides.
Our IBR-approved engineers will select the correct trim and bonnet seal for your supercritical steam application.