the working principle of pressure reducing valve can be simply interpreted as inlet pressure + outlet pressure = spring force, by controlling the opening size of the mouth of the river closure in the relief valve to control the pressure at the exit, the opening is smaller, the liquid through the mouth of the river closure of fluid resistance is smaller, the smaller the pressure loss and outlet pressure, the greater the outlet pressure, the smaller conversely.

assume that role on the diaphragm spring force to F

role under the relief valve diaphragm of outlet pressure for F1 inlet pressure P1 the effect size of the diaphragm is S1 = F1 P1 & times; S1

role in reducing valve valve core of the inlet pressure is F2 export pressure P2 the role of the Industrial Valves core area of S2 F2 = P2 & times; S2

when a balance is: F = F1 + F2 = P1 & times; S1+P2× S2

when the entrance pressure fluctuate, assuming that the inlet pressure becomes greatly P2 + delta p and other conditions unchanged, the spring force F < F1 + F2, pressure drive diaphragm upwards movement under the diaphragm, the spring is compressed F, at the same time of the opening of the mouth of the river has shrunk, liquid resistance, export the pressure decreases, F2 smaller, until reaching a new equilibrium.

when none of the pressure reducing valve export water or downstream of the pressure reducing valve is closed, outlet pressure continues to increase, F2 continued, under the pressure of diaphragm drive diaphragm continuously upgrade movement until the pressure reducing valve closed, the pressure reducing valve outlet pressure is greater than the set value, but because of inertia effect, upward movement of the diaphragm will not stop immediately, will continue to move up a little, the equivalent of the exit valve cavity, larger volume, the internal liquid pressure drop, until just equals the export of pressure reducing valve set pressure value

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