Quick answer: a gate valve isolates flow with a wedge that moves across the line, giving a straight-through bore and very low pressure drop when fully open. It is designed for full-open or full-close service, not for throttling, because a partly open gate erodes the seat faces and can vibrate.
Gate valve types we supply
- Rising stem and non-rising stem gate valves
- Solid wedge, flexible wedge and split wedge designs
- Bolted bonnet and welded bonnet construction
- Handwheel, gear operator, electric and pneumatic actuation
Size, pressure class and end connections
| Item | Typical range | Notes |
|---|---|---|
| Nominal size | DN50 – DN600 (2 in – 24 in) | Smaller and larger sizes by agreement |
| Pressure class | Class 150 – Class 900 | Higher classes subject to design review |
| End connection | Flanged RF / RTJ, butt-weld | Socket-weld and threaded for small sizes |
| Operation | Handwheel, gear, electric, pneumatic | Actuator sizing on request |
The ranges above are the usual industry values and are confirmed per project before production. Send your data sheet and we will confirm what applies to your requirement.
WCB carbon steel or stainless steel body
| Body material | Best for | Watch out for |
|---|---|---|
| WCB carbon steel | Steam, condensate, clean hydrocarbons, treated water, utility lines | Corrosion in wet or acidic service; external coating needed for coastal sites |
| CF8 / CF8M stainless steel | Corrosive media, chlorides, hygiene, long service life | Higher cost; hot seawater still needs a higher grade or alloy trim |
Options and configuration
- Trim materials: 13{c551cb9363ab9727d69ea7e93dec3df28b102936ccd98942d74ea9d2eb34ac9e} Cr, stainless steel, Stellite-faced seats
- Backseat design for stem repacking under pressure
- Bypass, drain and vent connections
- Anti-static and fire-safe designs where specified
- Special coatings, tagging and marking per project requirement
Testing and documentation
- Shell and seat leakage tests on every valve before shipment
- Dimensional and visual inspection to the approved drawing
- Material certificate and inspection record shipped with the valves
- Third-party inspection arranged at the plant when required
What drives the price
- Body material: carbon steel versus stainless steel
- Pressure class and nominal size
- Trim specification and whether seats are hard-faced
- Actuation, painting, third-party inspection and documentation level
待补内容位：待补：阀门设计标准号（API 600 / API 603 / ASME B16.34 等以实际执行为准）、可生产口径与压力上限、试压标准与保压时间、材质证书等级、批量交期。