Check Valves
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Description
Check valves are normally in the close position and open when the fluid flows through it. It also has the capability of shutting off the flow in the event the pressure downstream exceeds the upstream pressure. In this respect, it is used for flow in one direction only. Thus it prevents backflow through the valve. Because flow of the fluid through the valve is allowed to be in one direction only, check valves must be installed properly by noting the normal direction of flow. An arrow stamped on the outside of the valve body indicates the direction of flow. Check valves may be classified as swing check valve and lift check valve.
- Protect drinking water from contamination by backflow resulting from gravity, back siphonage or backpressure (e.g. Hose connected kitchen spray or shower hand spray).
- Protect sensitive equipment against possible damage or contamination resulting from a reversal of flow direction (e.g. water meter, pump or filter).
- Hold water in a system or pipe after the flow has been turned off to prevent drainage or facilitate restart (e.g. pumping systems).
- Prevent crossover flow in systems with unequal line pressures (e.g. cold and hot water inlets in thermostatic mixers).
- Reduce the risk of backflow or leakage in case of valve failure (e.g. solenoid valve at the inlet of an appliance).
- Allow complex systems to function properly by ensuring unidirectional flow (e.g. multi-zone heating system or booster pumps).
Application
Check valve applications
Technical Docs
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