Non Return Valve Technical requirements:

1.Design and manufacture per:    ANSI B16.34 or API 602.

2.Face to face dimension:       ASME/ANSI B16.10.

3.Connection dimension:

1) Socket end: ASME/ANSI B16.11; JIS B2306.

2) Screw end: ASME/ANSI B1.20.1 ;   JIS B0203. ISO 7/1

4. Pressure-temperature basis:  ASME/ANSI B16.34

5. Inspection: API 598.

6. Feature of construction: B.B lift check or B.B  swing or B.B lift check  with spring.

7. Body material: A105. F11. F22. F304. F304L. F316. F316L. 20# alloy. Monel. F321. LF2. etc.