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What is the significance and method of adjusting the return pressure of safety valve?
- Oct 19, 2018 -

Common problems in operation and maintenance of Air Compressors:


40.What is the significance and method of adjusting the return pressure of safety valve?


        Return pressure refers to the static pressure at the inlet of the valve when the pressure of the medium drops to a certain value and the disc contacts with the valve seat again after the relief valve reaches the discharge state. If the return pressure is too low or too high, the loss of medium and energy will be caused. If the return pressure is too high, the valve will jump frequently. The principle is to adjust the return pressure as high as possible to reduce the loss of medium and energy.

         

        Adjustment method: the return pressure is adjusted by adjusting ring, the principle of adjustment is the clearance principle, the smaller the clearance, the greater the resistance when ejecting, the greater the force to hold the valve core down, the more difficult to return to the seat. Conversely, the larger the gap, the easier the spool will fall back, and the higher the pressure of the return seat.

         

        For the safety valve with only the lower regulating ring, the regulating ring is upward adjusted, the return pressure drops, the regulating ring is downward adjusted, and the return pressure rises; for the safety valve with the upper and lower regulating ring, the distance between the upper and lower regulating ring decreases, the return pressure decreases, the distance between the upper and lower regulating ring increases, and the return pressure increases.