The brass solenoid valve opens and closes automatically when its coil is energised. It is compact, quick to install with threaded ends and costs less than plastic or stainless steel versions, which makes it the usual choice for clean water lines, water purifiers and irrigation.
Key features
- Fast, precise on/off control
- Threaded connection, easy to install
- Coil voltages 220 V AC, 110 V, 24 V
- Normally closed (NC) as standard
How a solenoid valve works
A solenoid valve combines an electrical coil with a mechanical valve. When the coil is energised it becomes an electromagnet that lifts the plunger and diaphragm; when power is cut, a return spring pushes them back.
- Normally closed (NC): closed without power, opens when the coil is energised.
- Normally open (NO): open without power, closes when the coil is energised.
- Direct acting: the plunger opens the orifice directly; simple and fast, usually for pressures up to about 10 bar.
- Pilot operated: the coil opens a small pilot port and line pressure opens the main diaphragm; suited to larger sizes.
- Semi-direct: combines both, works without a minimum pressure difference.
Installation notes
- Clean the pipe and install a strainer upstream to keep dirt off the diaphragm.
- Install the valve in the flow direction marked on the body, with the coil on top.
- Check that the coil voltage matches the power supply before connecting.
- Solenoid valves open and close very fast; they are not intended for positions that must stay energised continuously for very long periods.
