PVC and UPVC solenoid valves are made for liquids that corrode metal valves, such as acids, alkalis, salt solutions and seawater. They are light, do not rust and are widely used on chemical dosing lines in water treatment plants.
Key features
- Resistant to acids, alkalis and salt water
- Light, rust-free body
- Suitable for chemical dosing lines
- NC or NO versions
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.
