Direct Acting Solenoid Valves

A direct-acting solenoid is an electromechanically operated valve, controlled by an electric current. Zero-rated solenoid valves are widely available as either a two or three-port valve and are frequently used to control elements in fluidics. Direct-acting solenoid valves are used to shut off, release, dose, distribute or mix fluids. They are found in many application areas, due to their reliability, long service life and good compatibility with a range of media. Direct-operated solenoid valves also feature low control power and a compact design.

A direct-operated solenoid valve has the simplest working principle. Media flows through the small orifice which can be closed off by a plunger with a rubber gasket on the bottom. The plunger is held close to the valve by a small spring, which is electrically energised. From this electric core, a magnetic field is created, pulling the plunger towards the centre of the coil. Once the electric current has pulled the plunger up, the orifice opens to allow, media to flow through. In a Normally Open valve, the valve will work oppositely. Direct-acting solenoids don’t need a minimum operating pressure.