Features of forged steel check valve:

1) Standards:
a) Design&Manufacture:API 602,BS 5352,ASME B16.34
b) Face to Face: MSS SP-84
c) Connection End: ASME B2.1, ASME B16.11
d) Test : API598

2) Sizes: 1/2" - 2" or DN12 - DN50
3) Pressure Rating: Class150 - Class1500 or PN16 - PN250 
4) Material: A105,LF2,F11,F22,F5,F304,F304L,F316,F316L, etc.