ZAXIS240-3 Reverse proportional solenoid valve excavator parts hydraulic pump

Electromagnetic proportional valve working principle and detection:

Valve control of flow can be divided into two types:
One is switch control: either fully open or fully closed, the flow rate is either large or small, there is no intermediate state, such as ordinary electromagnetic through valves, electromagnetic reversing valves, electro-hydraulic reversing valves.
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.
So the purpose of using proportional valve or servo valve is: to achieve the flow control by electronic control (of course, after structural changes can also achieve pressure control, etc.), since it is throttling control, there must be energy loss, 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.

The structure and working principle of solenoid valve

The solenoid valve is a kind of switch that can control the fluid according to the switching action of the voltage of the control circuit, and can also adjust the flow by changing the size of the voltage. Solenoid valve is often used in liquid, gas flow control, conversion and pressure control, is an important automation component.
Solenoid valve is mainly composed of valve body, valve core, valve stem, solenoid coil, iron core, regulator and other parts. The valve body is a protruding structure, which has a connection head with a groove or a hole, used to connect the fluid pipeline, and the electromagnetic coil and regulator are installed outside: the spool is the main part of the control current, its role is to accept the control current, so that the valve stem moves, thereby changing the opening degree of the valve; The valve stem is the shaft connecting the valve core and the valve, which is used to convey the operation force controlled by the electromagnetic coil; The solenoid coil is the key device to control the flow of the solenoid valve, and its working voltage and power can be controlled according to the requirements of the control system in the fluid circuit. The iron core is a magnetic material in the electromagnetic coil, which can enhance the magnetic force of the coil, thereby increasing the efficiency of opening and closing; The regulator is a device to realize flow regulation, which realizes the purpose of regulation by changing the size of the current.