Solenoid Valves

Solenoid valves – electromagnetically switched hydraulic control

Solenoid valves switch the oil flow in the hydraulics of a tail lift electromagnetically, translating the electrical signal of the control unit into a mechanical switching movement. They open, block or redirect flow rates through defined switching positions. At SULEJ Ladebordwand you will find solenoid valves with 12-volt and 24-volt coils, in different switching logics and connection patterns, matched to the installed component – the link between the control system and the hydraulic circuit.

12V and 24V coils – electrical design and switching behaviour

In truck applications 24-volt coils dominate, while smaller distribution vehicles also use 12-volt coils. The coil winding is encapsulated inside a plastic housing and connected to the on-board network via a compact connector. When current flows, the armature pulls the switching piston against the return spring and opens or closes the passage. A clean voltage supply, a loss-free ground point and a tight-fitting connector are essential – voltage drops lead to sluggish switching and higher coil temperatures.

Fault patterns and function test – quick diagnosis

Typical fault patterns range from a complete loss of individual functions to delayed reaction of the platform. Testing involves coil resistance, voltage at the connector and the free armature travel in the de-energised state. With coked or corroded valve inserts it is worth replacing the complete cartridge valve rather than dismantling it. After installation, pay attention to the correct tightening torque, a clean O-ring on the cartridge and the correct connector.

Benefits at a glance

• Fast, precise switching of the oil flow via electrical signal
• Coils for 12V and 24V on-board networks, robust against vibration and humidity
• Compatible with common valve blocks and cartridge cavities
• Service-friendly – individual coil or complete cartridge replaceable

Functioning solenoid valves are the prerequisite for every button press to trigger the correct hydraulic movement.