Pressure Seal Gate Valve With By Pass Valve

Pressure Seal Gate Valve with By Pass Valve

The NSV pressure seal gate valve with By Pass Valve is engineered for medium to high-pressure and high differential pressure service in demanding oil & gas, chemical, LNG, and power applications. The body is cast from ASTM A216 WCB carbon steel, featuring a pressure seal bonnet that tightens under line pressure for reliable sealing, and a By Pass Valve to equalize pressure across the main valve for easier operation.

Key Features

Body material: ASTM A216 WCB

Size range: DN50 to DN600 (2"–24")

Pressure rating: ANSI Class 600 – Class 2500

Operating temperature: -29°C to +425°C

By Pass Valve benefits:

 • Equalizes upstream/downstream pressure before opening, reducing operating torque

 • Minimizes gate and seat wear, extending service life

 • Enables safe in-service pressure monitoring

Pressure seal bonnet benefits:

 • Sealing force increases with line pressure

 • Eliminates reliance on bolt preload; stable under thermal cycling

 • Compliant with API 600 requirements for high-pressure service

Sealing: Metal-to-metal seat (Stellite hardfaced), pressure seal bonnet design

End connection: Butt-Weld (BW, ASME B16.25) or Raised Face Flange (RF, ANSI B16.5)

Operation: Handwheel, or optional gearbox/pneumatic/electric actuator

Standards: Designed per API 600, ASME B16.34, ISO 5208

Typical applications

Hydrotreater reactor outlets, LNG high-pressure export lines, ethylene cracking units, ammonia synthesis circuits, supercritical boiler feedwater systems where high pressure integrity and operational reliability are critical.

FAQ

1. Q:Do you have customized valve?

A:Yes,we can supply customized valves.

2. Q:What's the packing for shipping?

A:Its carton for small valves(sample) and plywood case(don't to fumigate).

3.Q: Do u provide sample,is it free or extra ?

A: Yes, we could offer the sample, due to its value,we can supply free sample that small value and you afford the freight,but also welcome visit our factory to inspect quality.

4. Q:How can I get your company catalog?

A: For your reference, basic catalogue is same as "Download>E-Catalog" of homepage. If you need printed material or request more specific data like PQ material, please contact sales team.

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