Solenoid Directional Control Valve is Made of Durable Materials

Solenoid directional control valve is used in the hydraulics industry. These types of valves use electromechanical solenoids for sliding of the spool. These valves are used extensively because they can be simply controlled by electric power. To generate large forces the valve needs large amounts of electrical power.  The valves heat up over a period of time and hence pose a threat to extended use. The duty cycles can be limited to prevent heat generation. Their direct acting can only be used for low actuating forces.

Low power solenoid valves operate small pilots that start the flow of liquid that drives a larger hydraulic valve that uses more power. The 3 ported 2 position valve is a pilot valve also called bi-stable pneumatic valve. It can retain its position during loss of power.

Directional control valves can be classified according to number of ports, number of positions, actuating methods and type of spool. The number of entries and exits through which fluid flows in and out of the valve establishes it as a two way or a three way or a four way valve.

Number of positions refers to the normal and working positions which a valve spool can take. You can have a two position, three position and proportional valves. There are four basic actuating methods for these valves: manual, mechanical, hydraulic and solenoid. Simple levers and paddles are used in manual valves. Springs are used to recover the valve position.  A lever or external pneumatic or hydraulic signal is used to return the spool. In mechanical valves, cams, wheels, rollers are used to apply force. These are not as durable and have a limited life. Hydraulic valves are used for higher pressures. They are made of durable materials.

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