How To Distinguish The Quality Of The Solenoid Valve?
The quality of the solenoid valve can directly affect whether the machine can operate normally. When judging the quality of solenoid valves, we will use the following methods:
Check the coil with power
When the solenoid valve coil is energized, the coil will heat up. According to the temperature, you can touch the temperature of the coil by hand. Because the solenoid valve coil generates magnetic force when it is energized, metal objects can be used to contact whether there is suction in the coil.
Check coil without power
The resistance value of the solenoid valve coil can be measured with a multimeter. According to the resistance value, it can be judged whether the coil is good or short-circuited or short-circuited. Whether the power supply of the solenoid valve meets the requirements, a multimeter can be used to measure its power supply. The solenoid valve has 220AC and 24VDC power supply, so select the measurement according to the coil voltage.
Take pneumatic solenoid valve as an example
After connecting the air circuit of the solenoid valve, it is energized and manually debugged. The pneumatic solenoid valve has a manual button, which can switch the air circuit back and forth. After connecting the air source, you can hear the sound of venting without manually, indicating that the sealing ring inside the solenoid valve is worn or damaged.
Its working principle: when the solenoid valve is in the closed state, the coil cannot be energized, and there is no power consumption. The coil does not generate heat. Due to the coexistence of medium pressure and spring elasticity, the suction force generated by the moving iron core is not enough to draw the moving and static iron cores together. When energized, the coil produces suction, and the movable iron core overcomes the spring elastic force and medium pressure under the combined action of the electromagnetic suction and the suction generated by the permanent magnet, so that the static iron core is attracted, the solenoid valve opens and the valve port is opened at the same time. The outlet forms a passage. At this time, the coil power supply can be cut off, the moving and static iron cores still remain in the closed state, and the solenoid valve remains in the open state. When the solenoid valve needs to be closed, the coil is de-energized and the force generated by the coil disappears, unable to overcome the elastic force of the spring and the pressure of the medium. Therefore, the attractive force of the moving iron core to the static iron core is weakened, so that the moving and static iron cores are separated, and the valve port is closed at the same time. Block the inlet and outlet passages of the valve body.
For example, some solenoid valves change the path by moving the valve stem, and some solenoid valves communicate or block the passage of media through rubber diaphragms, valve cores, etc. to change the on-off of the media. Therefore, there are many types of solenoid valves, and different types of solenoid valves have different uses and functions.