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Technical specification of relief valve

Technical specification of relief valve


Constant pressure overflow effect: In the throttle regulation system of the quantitative pump, the constant flow rate is provided by the quantitative pump. When the system pressure increases, the flow demand decreases. At this time, the relief valve opens, so that the excess flow returns to the tank, to ensure that the inlet pressure of the relief valve, that is, the outlet pressure of the pump is constant (the valve opening usually fluctuates with the pressure).

Voltage stabilization: The relief valve is connected in series on the return road. The relief valve produces back pressure and the stationarity of the moving parts increases.

The unloading function of the system: the remote control port of the relief valve is connected with the solenoid valve with small overflow in series. When the solenoid is energized, the remote control port of the relief valve is connected to the oil tank, and the hydraulic pump is unloaded at this time. The relief valve is used as a relief valve at this time.

Safety protection: When the system works normally, the valve closes. Only when the load exceeds the prescribed limit (the system pressure exceeds the set pressure) can the overflow be opened and overload protection be carried out, so that the system pressure is no longer increased (usually the set pressure of the relief valve is 10%-20% higher than the maximum working pressure of the system).

In practical application, it is generally used as unloading valve, remote pressure regulating valve, high and low pressure multi-stage control valve, and sequential valve to generate back pressure (string in the oil return path).

Overflow valves generally have two structures: 1. Direct-acting overflow valves. 2. Pilot relief valve.

The main requirements of relief valve are: large range of pressure regulation, small deviation of pressure regulation, small pressure oscillation, sensitive action, large overload capacity and low noise.