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
Power plant valve manufacturer
We build one thing: forged, pressure-seal valves for high-temperature steam and high-pressure feedwater. Gate, globe, check and stop-check, Class 900 to 2500, A105 through F91 and F92.
There is a lot of competition in this category and much of it is undifferentiated. What we have tried to do on this site is state parameters with their basis, list standards only where they apply, and leave certificate and capability claims blank until they can be evidenced. If that reads as unusually cautious for a supplier website, that is the point.
What we manufacture
Pressure Seal Globe Valve
globe · pressure seal bonnet
- Body
- A105, A182 F11, F22, F91, F92
- Size
- NPS 2-16 (DN 50-400)
- Class
- Class 900 - 4500
- Temp
- up to 650 °C / 1200 °F
- End
- BW, SW, RTJ, RF
- Standard
- ASME B16.34
Pressure Seal Check Valve
check · 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
Main Steam Valve
Gate / globe / check · pressure seal bonnet
- Body
- A182 F22, F91, F92
- Size
- NPS 2-24 (DN 50-600)
- Class
- Class 1500 - 4500
- Temp
- 540 - 650 °C for USC main steam
- End
- BW
- Standard
- ASME B16.34
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
Stop-Check Valve
stop check · pressure seal bonnet
- Body
- A182 F22, F91, F92
- Size
- NPS 2-16 (DN 50-400)
- Class
- Class 900 - 2500
- Temp
- up to 620 °C / 1148 °F
- End
- BW, RTJ, RF
- Standard
- ASME B16.34
The technical envelope
| Parameter | Range |
|---|---|
| Size | NPS 1/2-24 (DN 15-600) |
| Pressure class | Class 150-2500; 4500 project-dependent |
| Design temperature | to 566 °C standard; higher with F92 against the rating table |
| Body materials | A105/A105N, F11, F22, F91, F92, WB36; WC6/WC9 cast where specified |
| Bonnet | Pressure seal from Class 900, bolted below |
| Trim | 13Cr, F6a, F6NM, 422SS with Stellite 6 overlay |
| Ends | BW, SW, NPT, flanged RF and RTJ |
| Design code | ASME B16.34; NB/T 47044 for Chinese-standard projects |
How we quote
- You send the duty. Medium, design pressure, design temperature, class, size, material, end connection, operator. The RFQ checklist explains why each one changes the answer.
- We respond line by line. Including the lines where we would need a deviation and the lines where we think the wrong valve has been specified.
- You mark up the ITP. Hold, witness and review points agreed before the order, not after manufacture starts.
- GA drawing for approval. Envelope, face-to-face, end preparation and orientation confirmed before anything is made.
- Manufacture against the agreed plan, with the record produced at each stage.
What we will not do
- Publish service life or cycle life figures we cannot substantiate
- Claim zero leakage on a metal-seated valve
- List API 600 on a pressure seal valve
- Claim ISO 15848 compliance across a range on the basis of one type test
- Substitute cast for forged, or one material grade for another, without telling you
- Quote outside our envelope - cooling water, compressed air, control valves
Each of these is something we have seen on competitor sites in this category. The list is here so you can hold us to it.
Frequently asked questions
Are you a manufacturer or a trading company?
The honest answer is that this deserves evidence rather than an assertion. Our manufacturing page states the route stage by stage and what record each stage produces, and it carries an explicit note that the in-house versus sourced split must be documented before it is claimed. Any supplier who answers this question in one line with no evidence should be treated carefully - including us.
What is your minimum order?
These are engineered items rather than stock. A single valve is quotable; the economics change with quantity mainly through forging and heat treatment batching. We will tell you where a quantity break actually falls rather than applying an arbitrary minimum.
How long does a Class 2500 F91 valve take?
Lead time is driven by forging availability and heat treatment, not machining capacity. We quote a date against actual forging supply at the time of enquiry. A supplier quoting a standard catalogue lead time for a creep-grade Class 2500 valve is quoting a number they have not checked.
Can you work to our project specification?
Yes, and we prefer it to working to our own standard. Send the valve specification, the piping class extract and the ITP. We respond marking what we comply with, what we comply with subject to clarification, and what we cannot meet - the third list being the useful one.
Do you supply the whole plant valve list?
No. We supply the high-temperature and high-pressure end: main steam, reheat, feedwater, extraction, drains and vents. We do not cover cooling water, compressed air or general utility valves. A supplier claiming to manufacture everything from one factory is usually trading.
Which certifications do you hold?
The certificates page currently lists none, because none has been verified for publication yet. Certification claims are the easiest thing on a supplier website to assert and the most damaging to assert wrongly. They will be listed with issuing body, certificate number and validity, and you will be able to check them against the certification body register.
Get in touch
Sales contact details are pending publication - use the enquiry form in the meantime.