A diaphragm type solenoid valve operates by a soft sealing diaphragm opening or closing against a valve seat. The media flows through the inlet port, over the seat and out of the downstream outlet port. In a Normally Closed Solenoid Valve type, the diaphragm remains closed until power is applied, at which point the diaphragm lifts and allows flow through the valve.
Poppet type solenoid valves operate in a similar way to diaphragm type solenoid valves, but as opposed to a rubber diaphragm, they employ a disc or tapered plug to come into contact with a valve seat. They are most commonly supplied as direct-acting solenoid valves, and can be used in a wide range of solenoid valve applications.
A Spool type solenoid valve is made up of a body with a cylindrical spool sitting inside a sleeve. The spool itself is full of many small holes which connect the valve ports and allow a pre-determined flow path through the valve. Once energised, the spool moves within the chamber, creating a different flow path through the valve.
Solenoid valve body designs explained - Zorgon (Zhejiang) Automation Technology Co.,Ltd. (cnzorgon.com)
www.cnzorgon.com/solenoid-valve-body-designs-explained.html
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