ASME B16.34 pressure seal bonnet gate valve, also called high pressure gate valve, is designed and manufactured according to ASME B16.34 or API600, and the valve has the characteristics of beautiful appearance, compact structure and reliable seal. It is suitable for various pressure scope for pipelines Class900 to Class2500. The pressure seal bonnet gate valve uses a sealing structure combined with the packing outer seal and the internal pressure self-sealing at the stem seal to ensure that the medium does not leak. The outer seal of the stem is filled with polytetrafluorene or O-ring packing, which is pressed tightly with packing gland. Under the action of media pressure, the upward pressure is generated, the greater the pressure of the medium, the greater the sealing force, this structure is suitable for high media. 

Cast steel pressure seal bonnet gate valve to API 600 / ASME B16.34;

Forged steel pressure seal bonnet gate valve to API 602; 

Inspection and Test: API 598; 

End flange dimension: ASME B 16.5 ( for NPS≤24); ASME B 16.47;

BW end dimension: ASME B 16.25. 

Socket-weld dimension: ASME B 16.11.

Face to face and end to end: ASME B 16.10, Manufacturer's standard;

Pressure-temperature ratings: ASME B 16.34. 

Shell Materials : Carbon steels ASTM A216 Grades WCB and WCC; Alloy Steels ASTM A217 Grades WC1, WC6, WC9, C5 and C12; impact-tested carbon-manganese steels ASTM A352 Grades LCB and LCC; corrosion-resistant steels ASTM A351 Grades CF3, CF3M, CF8 and CF8M; duplex ASTM A890 Grade 4A, also available for forged steel material.