Normally Closed – In its resting state, a normally closed solenoid valve type is shut, and does not allow flow. Once energised, the valve opens and allows the media to flow over the valve seat and out of the downstream outlet port.
Normally Open – The opposite to a normally closed solenoid valve, normally open valves allow full flow through the valve with no power applied. To close the valve, you apply power to the solenoid coil which will stop the flow of media through the valve.
Proportional – Sometimes applications require more flow control than simple on/off valves will allow. This is where proportional valves
step in. They operate by taking an electrical input current, normally 4…20mA or 0…10v, and proportionally adjusting the valve position to regulate the flow.
Sol/Spring (Monostable) or Sol/Sol (Bi-Stable) – Most commonly associated with Spool valves, these terms refer to the operation of the valve. A Sol/Spring valve uses the solenoid to actuate the valve to its second position, and allows the spring to return the valve to its resting state, where a Sol/Sol valve requires solenoid actuation in both directions.
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