Dalian Xiangrui Valve Manufacturing Co., Ltd.

Reference Standard CB/T3944 Flanged Stainless Steel Check Valve

This standard applies to the design, manufacture, and acceptance of check valves used in piping systems of liquefied gas carriers, bulk chemical carriers, and ships with a nominal pressure not exceeding 2.5 MPa and a design temperature not lower than -165 ℃. Other ships' piping systems using check valves with corrosive media may refer to this standard.

Type

The types of check valves are specified as follows:

Type A—Straight-through check valve with flange connection dimensions and sealing surfaces according to GB/T 569-1965;

Type B—Straight-through check valve with flange connection dimensions and sealing surfaces according to GB/T 569-1965;

Type AS—Straight-through check valve with flange connection dimensions and sealing surfaces according to GB/T 2501-1989;

Type BS—Straight-through check valve with flange connection dimensions and sealing surfaces according to GB/T 2501-1989;

Basic Parameters of Check Valve

Type	Nominal Pressure PN MPa	Operating Temperature ℃							Nominal Diameter DN mm
		≤20	100	150	200	250	300	350
		Maximum Allowable Working Pressure P MPa
		P2	P10	P15	P20	P25	P30	P35
A, B	1.0	0.95	0.86	0.81	0.76	0.71	0.66	0.36	65～125
A, B	2.5	2.38	2.15	2.01	1.89	1.77	1.66	1.59	20～100
AS, BS	1.6	1.52	1.31	1.29	1.21	1.13	1.06	1.01	100～125
AS, BS	2.5	2.38	2.15	2.01	1.89	1.77	1.66	1.59	20～100

Keyword

check valve

Reference Standard CB/T3944 Flanged Stainless Steel Check Valve This standard applies to the design, manufacture, and acceptance of check valves used in piping systems of liquefied gas carriers, bulk chemical carriers, and ships with a nominal pressure not exceeding 2.5 MPa and a design temperature not lower than -165 ℃. Other ships' check valves used in piping systems with corrosive media may refer to this standard.

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