Excavator hydraulic pump solenoid valve proportional solenoid valve TM68301

    Proportional valve, valve flow control can be divided into two types. One is switch control, the other is continuous control, servo valve and other valves are different, its energy loss is greater, because it needs a certain flow to maintain the work of the pre-stage control oil circuit. One is switch control: either fully open or fully closed, the flow rate is either maximum or minimum, there is no intermediate state, such as ordinary electromagnetic through valve, electromagnetic reversing valve, electro-hydraulic reversing valve. The other is continuous control: the valve port can be opened according to the need of any degree of opening, thereby controlling the size of the flow through, such valves have manual control, such as throttle valves, but also electronically controlled, such as proportional valves, servo valves.

   Automatic control can be divided into intermittent control and continuous control. Intermittent control is switch control. In the pneumatic control system, an ON-OFF reversing valve with a lower operating frequency is used to control the on-off of the gas path. Rely on the pressure reducing valve to adjust the required pressure, rely on the throttle valve to adjust the required flow. This traditional pneumatic control system wants to have multiple output forces and multiple motion speeds, it needs multiple pressure reducing valves, throttle valves and reversing valves. In this way, not only the components need more, the cost is high, the composition of the system is complex, and many components need to be manually adjusted in advance. Electrical proportional valve control belongs to continuous control, which is characterized by the output quantity changes with the input quantity, and there is a certain proportional relationship between the output quantity and the input quantity. Proportional control has an open loop The difference between control and closed-loop control.