Solenoid Valves

Solenoid valves are standard components used in electronically controlled hydraulic systems, ensuring reliable control of hydraulic flows. They operate by switching electromagnetic linear motors on and off. In addition to conventional hydraulics, solenoid valves are also of great importance in open hydraulic systems.

How a Solenoid Valve Works

A solenoid valve consists of any hydraulic valve and an electromagnetic connection. When the electromagnet is closed, a piston pulls the valve spool in a desired direction. The mode of operation can be freely chosen. Practically all valve types can be electromagnetically controlled in this way.

Typical Solenoid Valves:

• Normally Open Valves
• Normally Closed Valves
• 4/2-Way Valves

Connecting a Solenoid Valve

The connection of the solenoid valve depends on its size and the hydraulic pressure applied. Small, mobile systems can be adequately controlled with 5-12 volts. For large applications, solenoid valves requiring a 400-volt power supply may be necessary. Solenoid valves are connected using standard plugs.

Required Sensor Technology for Solenoid Valves

Malfunctions in solenoid valves are redundantly checked depending on their relevance. A proximity switch can verify whether the piston is truly extended or retracted. This redundancy is indispensable in particularly sensitive areas, such as cooling systems of power plants, etc.

Testing Solenoid Valves

Solenoid valves can be tested with a simple ohm measurement. The coil located in the electromagnet must always have a defined resistance; otherwise, a defect is present. A check of solenoid valves also always includes an inspection of the contacts. These can quickly be affected by corrosion, especially in water-carrying systems.

Areas of Application for Solenoid Valves

Solenoid valves are available in all sizes and designs. Their particular advantage is that the operator does not have to be near the hydraulic system to redirect the volume flow in the desired manner.

Typical applications for solenoid valves:

• Controlled Heating Systems
• Electromagnetic Hydraulic Controls
• Servo Control