Solenoid valve for waterIt is an automatic element that uses electromagnetic force to control the flow of water, and it can realize the adjustment of water direction, flow, speed and other parameters.
There are many principles and structures of solenoid valves for waterThere are three common types: direct-acting, distributed direct-acting and pilot-operated. Let me briefly introduce how they work and their characteristics:
1. Direct-acting solenoid valve:
It is a kind of solenoid valve that directly uses electromagnetic force to push the valve core to open or close, its structure is simple, the action is reliable, and it can work normally under zero pressure difference or vacuum, but the diameter is generally not more than 25mm.
Direct-acting solenoid valves are divided into two types: normally open and normally closed, normally open is when the valve is turned off and the valve is closed when the power is on, and the normally closed type is the opposite.
2. Distributed direct-acting solenoid valve:
It is a combination of direct-acting and pilot-operated solenoid valve, its structure and working principle are similar to direct-acting solenoid valves, but its spool is composed of a plurality of small spools, distributed around the main spool, when the solenoid coil is energized, the small spool is opened first, and then the pressure difference is used to push the main spool to open, so as to achieve water flow control of large bore.
The distributed direct-acting solenoid valve can work normally under zero differential pressure or vacuum and high pressure, but the power is large and requires horizontal installation.
3. Pilot operated solenoid valve:
It is a kind of solenoid valve that uses the pilot air pressure output by the electromagnetic pilot valve to push the main valve core to open or close, and its structure is composed of two parts: the pilot valve and the main valve, and the two are connected by channels.
When the solenoid coil is energized, the pilot valve is opened, so that the pressure of the upper and lower chambers of the main valve core is unbalanced, so that the pressure difference is used to move the main valve core and realize the on-off of the water flow.
Pilot operated solenoid valves have a high fluid pressure range and can be installed arbitrarily, but must meet certain fluid pressure difference conditions.
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