The relief valve operates by the action of spring which is determined
by an operating pressure. The opening pressure of the spring can be
adjusted by an adjusting screw provided on top of the relief valve. The
spring acts opposite to the direction of the pressure and thus during
normal operation of the machinery, the spring tension will not allow the
valve to operate.
When the pressure acting on the valve seat increases to above normal
and equalizes with the force of the spring acting downwards, the relief
valve will lift and release the excessive pressure until a level of
equilibrium is reached.
The lifting pressure of the valve can vary from 8~15% of the working
pressure for unfired system, but also depends on manufacturers
recommendations. As soon as the pressure of the system becomes normal,
the spring which was set to lift at a particular pressure will close the
valve as a result of the spring tension and the machinery or system
will retain its normal operation.

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