5. Relief ValvesPurpose: Relief valves are used to protect systems from over-pressure or to control processes by allowing flow to commence when a certain pressure has been reached.
Operation: Refer to Figure
A spring holds the valve disc in place against the seat. The valve, therefore, will not open until the force exerted on the valve disc by the fluid pressure exceeds the force exerted by the spring. When this occurs, flow can take place through the outlet port until the fluid pressure is reduced to below the valve operatingpressure. The spring force will then release the valve.
Relief valves operate automatically and are usually pre-set to a specified relief setting by the manufacturers or adjusted when in use, if required. Re-calibration is then required
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