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The proportional pressure regulator is a type of valve used to control the pneumatic pressure in the pneumatic system or through the pressure input signal. Proportional pressure regulators mainly include relief valve, pressure reducing valve and sequence valve. This article would introduce what are the similarities and differences between these three valves, how they are used in the system, how the controlled pressure changes, and so on.
(1) The relief valve is divided into a direct-acting relief valve and a pilot-operated relief valve.
The pilot valve of the pilot-operated relief valve is a small-flow direct-acting relief valve. The pressure reducing valve is also divided into a direct-acting pressure reducing valve and a pilot-operated pressure-reducing valve. The pilot valve of the pilot-operated pressure-reducing valve is not a direct-acting pressure reducing valve, but a direct-acting relief valve with a small flow. The sequence valve also has a direct-acting sequence valve and a pilot-operated sequence valve. The pilot valve of the pilot-operated sequence valve is not a direct-acting sequence valve, but also a small-flow direct-acting relief valve. That is to say, the pilot valve of the pressure control valve is a direct-acting relief valve with a small flow.
(2) Comparison of pressure reducing valve and relief valve
The pressure reducing valve is controlled by the outlet pressure to ensure that the outlet pressure is a fixed value. The relief valve is controlled by the inlet pressure to ensure that the inlet pressure is a fixed value. Both are valves that control the air pressure in the pneumatic system.
The valve port of the pressure reducing valve is normally open. The valve port of the relief valve is normally closed. The pressure reducing valve has a separate exhaust port. The leaking oil in the spring chamber of the relief valve is drained to the outlet through the flow passage in the valve body. The pressure reducing valve has the same remote control port as the overflow valve.
(3) The pressure of each valve under different working conditions
Suppose: the pressure generated by the load F is pF, the pressure set by the relief valve is pY, and the set pressure of pressure reducing valve is pJ, and pJ<pY.
When pF<pJ, p=pF, the relief valve does not work.
When pF≥pJ, p=pJ, the relief valve works, the inlet pressure of the relief valve and the pump outlet pressure are pY.
The sequence valve is divided into internal control and external control. The external control sequence valve is a valve controlled by a pressure signal. It is an on-off valve. The internal control sequence valve has different uses and functions. They are introduced separately below.
Internal control and external leakage, used as sequence valve
Suppose: the pressure generated by the load F is pF, the pressure set by the relief valve is pY, and the set pressure of the sequence valve is pS.
When pY<pS, p=pF, the sequence valve does not work, this situation is not allowed, in other words, the set pressure of the sequence valve must be less than the set
pressure of the relief valve.
When pY≥pS
When pS≥pF, p=pF
When pS<pF
When pF<pY, p=pF
When pF≥pY, p=pY
Internal control and internal leakage have the same symbol as the relief valve, and also have the same function. External control internal leakage and external control external leakage sequence valve, their control pressure has nothing to do with the pressure before and after the valve. When the control pressure is greater than the pressure set by the external control sequence valve, the pressure before and after the valve is equal. When the control pressure is less than the pressure set by the external control sequence valve, the primary and secondary pressures are determined according to their own loads.
For further information about KaoLu proportional pressure regulator or proportional pressure reducing valve, please visit https://www.genndih.com/proportional-pressure-regulator.htm
(1) The relief valve is divided into a direct-acting relief valve and a pilot-operated relief valve.
The pilot valve of the pilot-operated relief valve is a small-flow direct-acting relief valve. The pressure reducing valve is also divided into a direct-acting pressure reducing valve and a pilot-operated pressure-reducing valve. The pilot valve of the pilot-operated pressure-reducing valve is not a direct-acting pressure reducing valve, but a direct-acting relief valve with a small flow. The sequence valve also has a direct-acting sequence valve and a pilot-operated sequence valve. The pilot valve of the pilot-operated sequence valve is not a direct-acting sequence valve, but also a small-flow direct-acting relief valve. That is to say, the pilot valve of the pressure control valve is a direct-acting relief valve with a small flow.
(2) Comparison of pressure reducing valve and relief valve
The pressure reducing valve is controlled by the outlet pressure to ensure that the outlet pressure is a fixed value. The relief valve is controlled by the inlet pressure to ensure that the inlet pressure is a fixed value. Both are valves that control the air pressure in the pneumatic system.
The valve port of the pressure reducing valve is normally open. The valve port of the relief valve is normally closed. The pressure reducing valve has a separate exhaust port. The leaking oil in the spring chamber of the relief valve is drained to the outlet through the flow passage in the valve body. The pressure reducing valve has the same remote control port as the overflow valve.
(3) The pressure of each valve under different working conditions
Suppose: the pressure generated by the load F is pF, the pressure set by the relief valve is pY, and the set pressure of pressure reducing valve is pJ, and pJ<pY.
When pF<pJ, p=pF, the relief valve does not work.
When pF≥pJ, p=pJ, the relief valve works, the inlet pressure of the relief valve and the pump outlet pressure are pY.
The sequence valve is divided into internal control and external control. The external control sequence valve is a valve controlled by a pressure signal. It is an on-off valve. The internal control sequence valve has different uses and functions. They are introduced separately below.
Internal control and external leakage, used as sequence valve
Suppose: the pressure generated by the load F is pF, the pressure set by the relief valve is pY, and the set pressure of the sequence valve is pS.
When pY<pS, p=pF, the sequence valve does not work, this situation is not allowed, in other words, the set pressure of the sequence valve must be less than the set
pressure of the relief valve.
When pY≥pS
When pS≥pF, p=pF
When pS<pF
When pF<pY, p=pF
When pF≥pY, p=pY
Internal control and internal leakage have the same symbol as the relief valve, and also have the same function. External control internal leakage and external control external leakage sequence valve, their control pressure has nothing to do with the pressure before and after the valve. When the control pressure is greater than the pressure set by the external control sequence valve, the pressure before and after the valve is equal. When the control pressure is less than the pressure set by the external control sequence valve, the primary and secondary pressures are determined according to their own loads.
For further information about KaoLu proportional pressure regulator or proportional pressure reducing valve, please visit https://www.genndih.com/proportional-pressure-regulator.htm