For pipes of DN50 and above, solenoid valves are made with a cast iron body and flanged ends. Flanges give a strong, secure connection on large lines. The valve is used for clean water and production water at temperatures below 120 °C.
Key features
- Flanged connection for large pipes
- Strong cast iron body for high pressure
- Sizes DN50 – DN150
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.
