API 594 Dual Plate Check Valve is one kind ofimportant non return valve. It allows the fluid to flow only in the desireddirection. The design is such that any flow or pressure in the oppositedirection is mechanically restricted from occurring.

RSF's non return valve of API 594 Dual Plate Check Valve is usedto prevent backflow of fluid, which could damage equipment or upset theprocess. The dual plate wafer check valve (lug, flange, BW) is especiallyuseful in protecting a pump in liquid applications or a compressor in gasapplications from backflow when the pump or compressor is shut down. Swingcheck valve is also applied in process systems that have varying pressures,which must be kept separate.


Basic Design: API 594, API 6D, ASME B16.47

Face to Face: ASME B16.10, API 6D, EN558, ISO5752

Flange Ends: ASME B16.5, ASME B16.47, EN1092

BW Ends: ASME B16.25

Pressure Test: API 598, EN12266-1


Dual Plate Check, Springs Loaded

Wafer, Lug, Flange Ends or BW Ends

InternalShaft or External Hinge Pin

SizeRange: 2" to 36" (DN50 to DN900)

PressureClass: Class 150 to Class 2500 (PN16 to PN420)


Body: WCB, LCB, LCC, WC1, WC6, C5, CF8, CF8M, CF3, CF3M, CF8C,4A, 5A

Hinge Pin: F6a, F304, F316, F304L, F316L, F321, F51

Trim: HF HFS, API 600 2009 Table 8

Painting: Epoxy, RAL9006


Special Class according to ASME B16.34

NACE MR 01-75