Sometimes reverse flow may be detrimental for equipment or process so it needs to be uni-directional for operational safety. This operational safety is accomplished by valve check. Valves check are self actuated and self operating devices.
Check Valves are used to protect the equipment that can be affected by reverse flow, such as flow meters, strainers and flow control valves.
Check Valves are used to check the pressure surges associated with hydraulic forces, for example, water hammer
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Check Valves are used to prevent the flooding that can take place if flow reversed.
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Check Valves are used to prevent the reverse flow on system shutdown.
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Check Valves are used to to prevent the flow under gravity.
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Check Valves are used for relief of vacuum conditions.