Pressure Seal Gate Valve
gate · pressure seal bonnet
- Body
- A105, A182 F11, F22, F91, F92
- Size
- NPS 2-24 (DN 50-600)
- Class
- Class 600 - 4500
- Temp
- up to 650 °C / 1200 °F
- End
- BW, SW, RTJ, RF
- Standard
- ASME B16.34
Petrochemical & Refining
Adjacent to power service and technically similar - but the specification culture, the media and the emission requirements are different, and it matters.
Typical conditions
| Parameter | Value | Basis |
|---|---|---|
| Temperature | 200-550 °C typical for hot service | typical |
| Class | Class 300-2500 | standard |
| Media | Steam, hot oil, hydrogen, hydrocarbon streams | standard |
| Emission requirement | Frequently mandatory - ISO 15848 or TA-Luft | per project |
The steam systems are familiar territory
Refinery and petrochemical steam systems use the same valve constructions as power plants: pressure seal gate and globe valves in forged alloy steel, hardfaced seats, butt weld ends. Where the duty is steam, our power plant range applies directly.
Hydrogen service changes the material discussion
High-temperature hydrogen attack is a real constraint on material selection, and the Nelson curves - not the ASME rating table - govern which grades are acceptable at which partial pressures and temperatures. If your service involves hydrogen at temperature, that has to be in the enquiry, because it can rule out grades that would otherwise be fine.
Fugitive emission requirements are usually mandatory
Unlike most power projects, petrochemical specifications commonly require certified low-emission performance to ISO 15848 or TA-Luft. This is a design and testing requirement, not a packing selection. We only claim it where the specific valve has been designed and type-tested for it - and we will say so plainly if it has not been.
Specification culture is different
Refinery projects typically apply a client valve specification with a long list of amendments to the base standards. Send it. We would rather mark up a specification honestly than agree to a general compliance statement and argue about clauses during inspection.
Materials commonly used here
Indicative only. The grade is set by the piping class and the ASME B16.34 rating at your design temperature - see the material matrix.
Recommended products
Forged Power Plant Check Valve
check · bolted + pressure seal
- Body
- A105, A182 F11, F22, F91, F92, F3…
- Size
- NPS 1/2-24 (DN 15-600)
- Class
- Class 150-2500
- Temp
- up to 650 °C / 1200 °F
- End
- BW, SW, NPT, RTJ, RF
- Standard
- ASME B16.34
Frequently asked questions
Are your valves certified to ISO 15848?
Only where a specific valve design has been type-tested to it and the certificate exists. We do not carry a blanket claim across the range. If your specification requires it, tell us at enquiry and we will state clearly whether we have the qualification for that design or would need to obtain it.
Can you supply to NACE MR0175 / ISO 15156?
Where the service requires it, the material selection and hardness limits change. Include the sour service requirement in the enquiry - it is not something that can be added to an existing design by changing the certificate.
Further reading
Discuss this application
Send the system conditions and we will come back with what we would supply, the rating basis, and any point where we would question the specification.