Indirect Acting Solenoid Valves
Indirect acting solenoid valves are more suited to process industry applications that always have media pressure in a pipeline. In a normally closed state, they operate by allowing a small amount of the process media into an orifice in the inlet port of the valve and into a chamber on top of the diaphragm. Under its own weight and volume, it applies pressure to the diaphragm which is forced onto the valve seat, reinforcing it’s closed position.
When the solenoid coil is energised, the diaphragm lifts off the seat to open the valve, forcing the process media in the chamber above back through the orifice in the inlet port and back into the flow stream where it continues its journey through the valve and down the pipework. This type of valve can also be referred to as a pilot operated solenoid valve, or pilot assist solenoid valve as the process media acts as a pilot for the valve operation.
Thanks to using the process media as a pilot for operation, indirect acting solenoid valves have a lower power consumption than direct acting valves, increasing efficiency. They are also more cost effective and occasionally more compact in their design. Pilot operated solenoid valves are available in a range of body and seal materials to suit almost any process industry application.
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