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Gate valves with NPS >2 are of flexible wedge gate; pav
valve.pipe armaturen.
Gate valves with NPS Stem Design
The stem is of integral forged design .The minimum diameter of the
stem shall per the standard requirement .The connection of the stem
and disc is T type .The strength of the connecting area is bigger
than that of the T threaded part of the stem . Stem Nut
Usually, the stem nut is made of ASTM A**9 D2.It is also can be
made of copper alloy if being requested by the customer .For large
sized gate valves (NPS *0 for Class **0, NPS 8 for Class **0, NPS 6
for Class **0,NPS 5 for Class **0),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 common gate valves ,We can also makes cryogenic gate
valve, Jacketed Gate Valve, Bellow Sealed Gate Valve, Extension
Stem Gate Valve for underground application, Flat Gate Valve,
etc.Water seal gate valve.By-Pass and Drain
Connections,Indicator
and Locking Devices. Operation type
Handwheel,Gear, Electric actuator,Pneumatic actuator,Bare
stem Standard
Design and Manufacture: API 6D,API**0,API**3,ISO****4,BS***4
or ASME B*6.*4
Inspection and Test: API **8/API 6D
End flange dimension: ASME B*6.5,ASME B*6.*7(API **5 ,MSS
SP*4)
Butt ends dimension: ASME B*6.*5(BW)
Face to face,end to end: ASME B*6.*0
Pressure-temperature ratings: ASME B*6.*4 NACE:
NACE ***5 Material ASTM A**6 WCB
WCC;ASTM A**7 WC1 WC6 WC9;ASTM A**1 CF8,A**1 CF8M, A**1 CF3,A**1
CF3M,A**1 CN7M;.ASTM A**2 LC1 LCB LCC LC3 or by
customers (Cast Steel, Alloy Steel,
Stainless Steel, Special Steel)*3CrMo *4 V
austenite; duplex stainless steel; ferrite; stainless steel;steel
castings
v
