Technical principle and maintenance method of steam solenoid valve
- Clicks: 950 Release time: 2013/7/3
Steam solenoid valves are electromagnetically controlled industrial equipment used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. The solenoid valve can be used with different circuits to achieve the desired control, while the precision and flexibility of the control can be guaranteed.
Technical principle of steam solenoid valve
1. The steam solenoid valve is a step-by-step direct pilot type solenoid valve, which can be divided into a normally closed solenoid valve and a normally open solenoid valve according to the different opening and closing states of the power failure.
2. Normally closed steam solenoid valve, after the coil is energized, the armature first lifts the auxiliary valve plug under the action of electromagnetic force, and the fluid on the main valve cup flows away through the auxiliary valve, reducing the pressure acting on the main valve cup. When the pressure on the main valve cup is reduced to a certain value, the armature drives the main valve cup and uses the pressure difference to open the main valve cup and the medium circulates. After the coil is de-energized, the electromagnetic force disappears and the armature is reset by its own weight. At the same time, depending on the medium pressure, the main and auxiliary valves are tightly closed.
3. Normally open steam solenoid valve, after the coil is energized, the moving iron core moves down due to the suction force, the auxiliary valve plug is pressed down, the auxiliary valve is closed, and the pressure in the main valve valve cup rises. When the pressure rises to a certain value, the main The upper and lower pressure difference of the valve valve cup is the same. Due to the electromagnetic force, the moving iron core loses under the main valve valve cup, the main valve seat is pressed, and the valve is closed. When the coil is de-energized, the electromagnetic suction force is zero, the auxiliary valve plug and the iron core are lifted up by the spring action, the auxiliary valve is opened, the main valve valve cup is pushed up by the pressure difference, the main valve is opened, and the medium is circulated.
Steam solenoid valve maintenance method
1. When the high temperature steam solenoid valve is not used for a long time, the manual valve before the valve should be closed. When re-enabling, the steam solenoid valve should remove the condensed water and perform the test operation several times. It can be put into use after the switch is normal.
2. When the high temperature steam solenoid valve is removed from the pipeline, the inside and parts should be wiped clean and stored with compressed air.
3, it is recommended to use the unit to send someone to take care of the maintenance.
4. When working, pay attention to the pressure gauge before and after the valve, the working pressure should not exceed the rated pressure, and the working pressure difference must be within the rated pressure difference. When the working pressure exceeds the rated pressure or the working pressure difference exceeds the rated pressure difference, the solenoid valve should be stopped, and the front and rear manual valves should be closed to prevent the solenoid valve from exploding and leaking.
5. The dirt inside and outside the high-temperature steam solenoid valve and the suction surface should be cleaned regularly, taking care not to damage the sealing surface.
6. After the high-temperature steam solenoid valve is installed, it is necessary to pass the medium experiment action several times, and it can be put into formal use after confirming normal.
7. When the use time is long, if the seal between the piston and the valve seat is not good, the piston sealing surface can be re-polished and then grinded with the valve seat.
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