Graphic Detailed pressure reducing valve working principle Italian OR piston pressure reducing valve Working principle: Pressure reducing valve principle of work can be simply understood as the inlet pressure + outlet pressure = spring force, by controlling the opening size of the pressure reducing valve shut-off port To control the pressure at the exit, the smaller the opening, the smaller the liquid resistance of the liquid through the shut-off port, the smaller the pressure loss, the greater the outlet pressure, and vice versa the smaller the outlet pressure. Pressure reducing valve principle of work can be simply understood as the inlet pressure + outlet pressure = spring force, as shown above: Assuming that the spring force acting on the diaphragm is F, the outlet pressure under the diaphragm of the pressure reducing valve is F1 inlet pressure P1 for the role of the membrane area S1 F1 = P1 × S1 role in the valve under the pressure valve inlet pressure F2 outlet pressure for the role of the spool P2 area S2 F2 = P2 × S2 When the balance is: F = F1 + F2 = P1 × S1 + P2 × S2 When the pressure at the inlet fluctuates, assuming that the inlet pressure becomes P2 + △ P and the other conditions remain unchanged, the spring force F <F1 + F2, the pressure under the diaphragm Push the diaphragm upward movement, the spring is compressed F larger, at the same time cut off the opening smaller, the liquid resistance becomes larger, the outlet pressure becomes smaller, F2 smaller, until a new balance. When the outlet of the pressure reducing valve is not closed or the downstream of the pressure reducing valve is closed, the outlet pressure continuously increases and the pressure F2 continues to increase. The pressure under the diaphragm drives the diaphragm to move upward until the pressure reducing valve is closed, Valve outlet pressure is greater than the set value, but due to inertia, the upward movement of the diaphragm will not stop at once, will continue to move up a little, equivalent to the outlet valve chamber becomes larger, larger, the internal liquid The pressure drops until it is exactly equal to the set pressure at the relief valve outlet.
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