products » check valves : working principles

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A check valve allows flow in one direction but stops flow in the opposite direction. It is also referred to as “non-return valve”.  In static conditions (no flow) The check valve is normally closed. The spring tension forces the plunger into its seat keeping the check valve closed. In dynamic conditions (flow) The water pressure exceeds the spring tension. The plunger is lifted off its seat allowing water to flow through the valve. In backflow conditions (reversed flow) If the pressure downstream of the valve increases (backpressure conditions) or if the system pressure upstream of the valve decreases (backsiphonage conditions) causing the flow to reverse direction the spring-loaded plunger closes and prevents backflow.   Flow Regulating Check Valves  (CV-FR series) Selected sizes of NEOPERL® check valves are available combined with a flow regulator to provide backflow protection and flow control (pressure compensating). These unique compact cylindrical cartridges are compatible with the mating cavity of DW check valves of the same size. Three cartridge sizes are available (12, 14 and 15mm) covering a range of flow rates from 0.5 gpm to 4 gpm.

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