Suitable for CAT Carter 2522237 excavator accessories solenoid valve 252-2237 24V

Proportional solenoid valve

How it works:

All solenoid valve components are an electromagnetic coil in terms of the electrical part, that is, an inductor. When the inductor is given an electrical signal, the electromagnetic field generated by the current will make the valve core move and realize the change of the controlled parameters.
Quality identification:
Each electromagnetic coil has a fixed resistance value R, but this R cannot be "0" or "∞", when R= "0" indicates the internal short circuit: when R= "∞" indicates the internal open circuit; with
The resistance of the coil to the housing cannot be "0". If the above conditions can be met and the solenoid valve does not work, it may be that the signal input is wrong or the valve core is stuck.

Pressure sensor

How it works:

For a three-wire pressure sensor, it can be understood as a three-wire potentiometer or variable resistor, usually adding a 5V voltage to two of the lines (1 line and 3 lines), and when the measured value changes, the voltage of the center line (2 lines) changes between 0 and 5V.

Quality identification:
1. Lead out the center line, change the measured signal, use a multimeter to measure whether the voltage of the center line (2 lines) changes with the measured signal.
2. Cross the sensor without fault

The working principle of proportional electromagnetic control valve is introduced

        It is based on the principle of the solenoid on-off valve: when the power is off, the spring presses the core directly against the seat, causing the valve to close. When the coil is energized, the electromagnetic force generated overcomes the spring force and lifts the core, thus opening the valve. The proportional solenoid valve makes some changes to the structure of the solenoid valve: it creates a balance between the spring force and the electromagnetic force under any coil current. The size of the coil current or the size of the electromagnetic force will affect the plunger stroke and valve opening, and the valve opening (flow) and the coil current (control signal) is an ideal linear relationship. Direct acting proportional solenoid valve flows under the seat. The medium flows in from under the seat, and the direction of the force is the same as the electromagnetic force, and the opposite of the spring force. Therefore, it is necessary to set the large and small flow values corresponding to the working range (coil current) in the working state. The proportional solenoid valve of the Drey fluid is closed (NC, normally closed type) when the power is off.