Diaphragm Type Solenoid Valves

Diaphragm type solenoid valves are most commonly associated with 2-way solenoid valves. They generally consist of a rubber diaphragm which moves up or down within a valve body. This promotes an opening or closing against a hard seat, thereby changing the state of the solenoid valve. In direct acting or diaphragm control valves, the media pressure has no bearing on the position of the diaphragm. It simply changes its state once the solenoid coil is energised and either opens or closes, depending on the specification of the solenoid valve in its resting state (normally closed or normally open).

In indirect or pilot operated solenoid valves, the pressure of the media flowing through the valve acts as a pilot and influences the position of the diaphragm, and therefore the state of the valve.

Diaphragm type solenoid valves are available in a wide range of materials to suit almost any industrial application and process media. Valve diaphragm materials include NBR, Viton, EPDM and PTFE, and more exotic materials are available for specialist duties. When choosing a solenoid valve, it is important to check the chemical compatibility of the valve diaphragm material in order to ensure longevity and suitability of the valve in your application.

MGA Controls Ltd are experts when it comes to supplying high performance diaphragm control valves. We will take the time to to understand your application, budget and any other special requirements before recommending the correct solution for your application.

Please contact the MGA sales team on 01704 898980  or store@mgacontrols.co.uk for more information about our extensive range of diaphragm valves.


Diaphragm valves function through the movement of the diaphragm in the valve. As the diaphragm moves, the seat opens and closes. This causes the state of the solenoid valve to change. Within the diaphragm valve, there is a small orifice which allows water to flow to a chamber between the diaphragm and the bonnet. Once the water has passed through the bonnet, it arrives in the solenoid area. The diaphragm control valve then closes, covering the inlet port hole. This movement is controlled by a light spring loaded metal piston.

Solenoid valves are a combination of two functional units: One is a solenoid operator, consisting of a coil, core, core tube or a shading coil and spring, the other half of the solenoid consists of the valve body: This can either be a disc, diaphragm or piston. The type of solenoid valve used will depend on specific application requirements. The purpose of a diaphragm in a diaphragm type solenoid valve is to control the air within a certain space. These control valves can also be either open or closed, depending on the movement of the magnetic core.

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