Solenoid Valves

We manufacture a variety of custom solenoid operated solenoid valves for various industrial applications, including pneumatically controlled ABS systems for heavy goods vehicle trailers.


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Penny & Giles

Solenoids & Solenoid Valves: Purpose & Functionality

A solenoid is a component that includes a coil of wire around a metal core. When you run an electric current through it, a magnetic field forms around the coil and creates linear motion. It effectively converts electrical energy into mechanical power. A solenoid valve is comprised of a coil, plunger and sleeve assembly, and is mainly used to control the flow of liquid or gas in a positive, fully closed or fully open mode. It does so with the same principle when the solenoid coil energises in a normally closed valve, the magnetic field raises the plunger, allowing the flow of material. In a normally open valve, the plunger inside prevents the flow of gas or liquid when the coil energises. The magnetic field of a solenoid has positive and negative poles like all magnets do, attracting or repelling material. However, in a solenoid, the electromagnetic field causes the piston to move back and forth.


  • Used to open, close, mix or direct liquid or gas through the valve.
  • Fast-acting and entirely automated
  • Long service life
  • High reliability
  • Compact design

Applications of Solenoid

Solenoids are versatile and used in a variety of applications. Found in automated factory equipment, doorbells, automotive, speakers, control of cleaning processes, and many other industrial settings, such as propane systems and nitrous injections, also known as solenoid valves. 

Types of Solenoid Valves

There are many types of solenoid valves, but the main two are either direct acting or pilot operated. Each type is a useful component dependent on its application. 
Pilot operated solenoid valves are the most widely used valves and utilise line pressure to open and close the main orifice in a valve. 


  • Easy installation
  • Cost-effective
  • Useful in high-pressure applications
Whereas direct acting solenoid valves can function from zero and require no difference in pressure between ports to operate.  


  • Variety of valve options
  • Useful in negative pressure applications
  • Compact design