DIN/EN Piston Check Valve
Piston check valves are also called lift check valves. They are essentially globe valves without the stem and top works, allowing the disc to respond to flow rates and direction. The disc has linear movement and is typically body-guided with conical seating surfaces. Springs can be added above the disc to provide more closure force when the disc returns to its closed position. Some manufacturers include externally attached equalizer piping to increase the disc opening with lower flows. The equalizer pipe is an open-pressure communication device that maintains equal pressure above the disc and in the piping downstream of the disc.
Depending on the valve body configuration (Y-pattern, angle, or T-pattern), the pressure drop could be close to that of a tilting disc check valve or much higher. The disc of this check valve design is stable in any open position and can be used with a wide range of flow rates.
Features of DIN/EN Piston Check Valves:
Lift Spring Loaded Disc Design
Internal Hinge Pin Design Standard
Through-body Hinge Pin Design Available
Flanged or Butt-welding Ends
One-way flow Control
Applicable Standards of DIN/EN Piston Check Valves:
a) Design&Manufacture:BS 1868, ASME B16.34
b) Face to Face: EN 558, ASME B16.10
c) Connection End: EN 1092, ASME B16.5, ASME B16.25
d) Test and Inspection: EN 12266, API 598, BS 6755
Sizes: 2" - 36" or DN50 - DN900
Pressure Rating: Class150 - Class2500 or PN16 - PN420
Material of Valve Body: WCB, LCB, WC6, WC9, C12, C5, CF8, CF3, CF3M, CF8M, etc.
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