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Design and Manufacture:Cast steel gate valve to API600 or API6D；Ispection and Test:Api598,API600 or API6D
End flange dimension:ASME B16.5(for NPS<24)、API605 or ASME B16.47 seriesA、MSS SP-44(for NPS<24) 
BW end dimension:ASME B 16.25
Socket-weld dimension:ASME B 16.11
Face to face and end to end:ASME B16.10
Pressure-temperature ratings:ASMEB 16.34

Body and bonnet Connection:The body and bonnet of Class 150-Class 900 gate valves are usually connected with studs and nuts,And the body and bonnet of Class 1500-Class 2500 gate valves are usually of pressurized seal design.
Belleville Spring Loaded Packing Impacting System     If being requested by the customer,the Belleville spring loaded packing impacking system can be adopted for enhancing the durability and reliablility of the packing seal.
Actuation  Handwheel or gear box is usually used for gate valve actuation,Chain wheel and electric actuator can be also used for gate  valve actuation if being requested by the customers.
Stem Nut     Usually,the stem nut is made of ASTM A439 D2.it is also can be made of copper ally if being requested by the customer.For large sized gate valves(NPS 10 for Class 150,NPS 8 for Class 300,NPS 6 for Class 600,NPS 5 for Class 900),rolling bearing is fitted at the two sides of the stem nut in order to minimize the open and close torque of the gate valve.
Special Gate valve    Besides the commom gate valves,our company's also makes cryogenic gate valve,Jacketed Gate Valve,Bellow Sealed Gate valve, Extension Stem Gate Valve for underground application,etc.