Hydraulic Valves Long Life With Small Impact And Vibration
Hydraulic Valve, is a kind of pressure oil operation automation element, it is controlled by the pressure valve, usually with the solenoid valve combination, can be used for long-distance control of hydropower station oil, gas, water pipe system of the break. Often used for clamping, control, lubrication and other oil circuits. There are direct type and pilot type of the division, more use of pilot. According to the control method can be divided into manual, electric control, liquid control. It is used to reduce and stabilize the oil pressure of a branch in the system, which is often used for clamping, controlling and lubrication. It has the direct type, the forerunner type, the superposition type cent.
According to the use of overflow valve ﹑ pressure reducing valve and sequential valves. ⑴ overflow valve: Can control the hydraulic system to maintain the constant state when the pressure is reached. The overflow valve used for overload protection is called a safety valve. When the system fails and the pressure rises to a limit that may cause damage, the valve opens and overflows to ensure the safety of the system. ⑵ Pressure Reducing valve: It can control the branch circuit to get the stability of the oil lower than the main circuit. The pressure relief valve according to its control function is different, can be divided into the fixed value pressure reducing valve (output pressure is constant value) ﹑ fixed difference pressure reducing valve (input and output press difference is fixed value) and the fixed ratio relief valve (input and output pressure to maintain a certain proportion). ⑶ sequential valve: Can make an executive component (such as hydraulic cylinder ﹑ hydraulic motor, etc.) after the action, and then in order to make other components action. The pressure produced by the pump first pushes the hydraulic cylinder 1 movement, while the inlet port of the sequential valve acts on area A, when the hydraulic cylinder 1 movement completely becomes, the pressure rises, the effect in area A's upward thrust is larger than the spring's adjustment value, the valve core rises causes the oil inlet and the outlet mouth to be interlinked, causes the hydraulic cylinder 2 movement.
By adjusting the throttle area between the valve core and the valve body and the local resistance it produces, the flow rate of the actuator is controlled. Flow control valve is divided into 5 kinds by use. ⑴ Throttle valve: After the throttle area is adjusted, the moving speed of the actuator which can make the load pressure change little and the motion uniformity requirement is basically stable. ⑵ speed Control valve: In the load pressure changes can maintain the throttle valve import and export pressure difference is fixed value. In this way, after the throttle area is adjusted, no matter how the load pressure changes, the speed control valve can maintain the flow through the throttle valve, so that the movement speed of the actuator is stable. ⑶ shunt valve: Regardless of the load size, can make the same oil source of two components to obtain equal flow of the equivalent shunt valve or synchronous valve, the proportional distribution of the flow of the proportional shunt valve. ⑷ set-flow valve: The effect is opposite to the shunt valve, so that the flow into the flow valve is proportionally distributed. ⑸ shunt Set Flow valve: Both shunt valve and set flow valve function.
1 The action is flexible, the function is reliable, the work time impact and the vibration is small, the noise is small, the service life is long.
2 The fluid passes through the hydraulic valve, the pressure loss is small, the valve mouth closes, the seal performance is good, the inside leakage is small, no outside leakage.
3) The controlled parameters (pressure or flow) are stable, and the variation is small when the external disturbance occurs.
4) Compact structure, easy installation, commissioning, use, maintenance and good versatility.