Body and Bonnet Connection
The body and bonnet of Class150~Class900 check valves are usually with studs and nuts. And the body and bonnet of Class1500~Class2500 check valves are usually of pressurized seal design.
For carbon steel check valve, the seat is usually forged steel. The sealing surface of the seat is spray welded with hard alloy specified by the customer. Renewable threaded seat is used for NPS<10 check valves, and welded on seat can be also optional if being requested by the customer. Welded on seat is used for NPS>12 crbon steel gate valves. Forstainless steel check valve, integral seat is usually adopted, or to weld hard alloy directly integrally. Threaded or welded on seat is also optional for stainless steel check valve if being requested by the customer.
1.5" - 36" (DN40 - DN900)
Pressure Rating For ASME
125LB,150LB, 300LB, 600LB, 900LB
Pressure Rating For ISO
PN10, PN16, PN25, PN40, Suit For ISO Flange
Pressure Rating For JIS
5K,10K, 20K, Suit For JIS Flange
CI / DI / WCB / CF8 / CF8M
NBR / EPDM / VITON / METAL (Same as Body)
API 594 and Manafacture's
FF / RF
Inspection and test: API598, JB/T9092;
Design and manufacture: API594, API 6D, JB/TB8937;
Face to face and end to end: API594, API6D, DIN3202, JB/T8937;
Pressure-temperature rating: ASME B16.34, DIN2410, GB/T9124, HG20625, SH3406, JB/T74;
Pipe flange: JB/T74-90, JB/T9112-9124, SH3406, ASME B16.5, DIN2543-2548, GB/T13402, API605, ASME B16.47.
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