HMB

The role of excavator overflow valve

by:HMB     2021-01-29
The overflow valve is a kind of hydraulic pressure control valve, constant pressure relief role mainly in hydraulic equipment, voltage regulator, unloading system and safety protection. Quantitative pump pressure overflow effect: in the throttle control system, the quantitative pump provides a constant flow rate. When the system pressure, can reduce traffic demand. The overflow valve open, make the excess flow back to the fuel tank, guarantee the overflow valve inlet pressure, pump outlet pressure constant ( Valve mouth often fluctuates according to pressure open) 。 Voltage stabilizing role: overflow valve series on the back to oil, back pressure relief valve, the moving parts stability increased. System unloading effect: in the overflow valve remote mouth concatenated excessive small flow of the electromagnetic valve, when the electromagnet electricity, overflow valve remote port fuel tank, hydraulic pump unloading at this time. Overflow valve when used as unloading valve. Safety protection: system to work normally, the valve closed. Only load in excess of the prescribed limit, The system pressure more than the setting pressure) When open the overflow, overload protection, no longer increases the system pressure ( Usually make the relief valve setting pressure higher than the system maximum working pressure 10% ~ 20%) 。 In practical application are: for unloading valve, remote pressure regulating valve, high and low pressure multi-stage control valve, sequence valve, used to produce back pressure ( String on the back to oil) 。 The overflow valve there are generally two kinds of structure: straight moving type relief valves; Straight-pilot overflow valve. Its main requirements are: regulating range is big, pressure regulating deviation is small, small pressure oscillator, action quick, large overload capacity, low noise. It is a kind of hydraulic pressure control valve. Main constant pressure relief role in the hydraulic equipment, voltage regulator, unloading system and safety protection. Constant pressure overflow effect: in quantitative pump throttle control system, the quantitative pump provides a constant flow rate. When the system pressure, can reduce traffic demand. The overflow valve open, make the excess flow back to the fuel tank, guarantee the overflow valve inlet pressure, pump outlet pressure constant ( Valve mouth often fluctuates according to pressure open) 。 Voltage stabilizing role: overflow valve series on the back to oil, overflow valve produce stationarity increasing back pressure moving parts. System unloading effect: in the overflow valve remote mouth concatenated excessive small flow of the electromagnetic valve, when the electromagnet electricity, overflow valve remote port fuel tank, hydraulic pump unloading at this time. Overflow valve when used as unloading valve. Safety protection: system to work normally, the valve closed. Only load in excess of the prescribed limit, The system pressure more than the setting pressure) When open the overflow, overload protection, no longer increases the system pressure ( Usually make the relief valve setting pressure higher than the system maximum working pressure 10% ~ 20%) 。
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