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
Coal Chemical
Coal chemical service adds erosive solids to high-temperature duty. Standard power valve constructions cover part of it; the rest is engineered.
Typical conditions
| Parameter | Value | Basis |
|---|---|---|
| Temperature | 200-550 °C in the utility systems | typical |
| Media | Steam, syngas, ash and slag-bearing streams, process water | standard |
| Erosive content | Significant in gasifier-adjacent service | per project |
| Class | Class 300-2500 | standard |
The steam and water systems are conventional
Coal chemical plants have large steam and boiler feedwater systems that behave exactly like a power plant. Our standard range covers those directly, and that is the majority of the valve count.
Gasifier-adjacent service is not
Streams carrying ash, char or slag erode conventional trim rapidly. A Stellite 6 overlay helps against impingement but does not make a valve suitable for a continuously abrasive stream. These positions need either a valve type designed for solids or a system change that keeps the solids out of the valve.
Where we will say no
If the duty is a continuously abrasive slurry through the seat, a hardfaced gate valve is the wrong answer and we will say so rather than sell one and let it fail. Custom severe-service engineering starts by establishing whether the duty is achievable at all.
Chinese standard projects
Coal chemical projects in China are commonly built to GB and NB standards rather than ASME. NB/T 47044 applies to the power station valve scope. We work to whichever the project specifies and will state where the equivalence between standards is not exact.
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
Feedwater Valve
Gate / globe / check · pressure seal bonnet
- Body
- A105N, A182 F11, F22
- Size
- NPS 2-20 (DN 50-500)
- Class
- Class 1500, 2500
- Temp
- 150-300 °C typical
- End
- BW, RTJ, RF
- Standard
- ASME B16.34
Frequently asked questions
Can you supply valves for the gasification island itself?
For the utility and steam systems around it, yes, directly from the standard range. For the process streams carrying solids, that is engineered severe service and starts with a design review against the actual stream composition - not a catalogue selection.
Do you work to GB standards?
Yes. Chinese-standard projects call up GB material grades and NB/T 47044 for power station valves. We will state material and standard equivalences explicitly, including where they are approximate rather than exact.
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.