Jonloo valve company supplied non-return valve with single flap. This type of Check Valve is simple, low cost and fits between most common flange types.
Standards
1.Design&Mamufacture: API 594, API 6D
2.Face-to-face API 594, API 6D, DIN 3202
3.Flange end: DIN2543-2548, API605, ASME B 16.47, ANSI B 16.5
4.Inspection and test: API 598