Truck Solenoid Valve

Truck solenoid valve is an automatic basic component used to control fluid, which belongs to the actuator. Not limited to hydraulic, pneumatic. The solenoid valve is used to control the direction of hydraulic flow, and the mechanical devices in the factory are generally controlled by hydraulic steel, so the solenoid valve will be used.

The working principle of truck solenoid valve is that there is a closed chamber in the solenoid valve, and through holes are opened in different positions. Each hole leads to different oil pipes. In the middle of the chamber is a valve, and on both sides are two electromagnets, on which side the magnet coil is energized, the valve body will be attracted to which side. The oil inlet hole is usually open, the hydraulic oil will enter a different discharge pipe, and then through the pressure of the oil to promote the oil of the piston, the piston and drive the piston rod, the piston rod drives the mechanical device.

Working state one: Truck solenoid valve coil is not powered on. At this time, under the action of the return spring, the solenoid valve core rests on the double tube end, closes the double tube end outlet, and the single tube end outlet is in the open state, and the refrigerant flows from the solenoid valve single tube end outlet pipe to the refrigerator evaporator and the freezer evaporator to the compressor to achieve the refrigeration cycle.

Working state two: solenoid valve coil power. At this time, the solenoid valve core overcomes the return spring force under the action of the electromagnetic force and moves to the single tube end, closes the single tube end outlet, and the double tube end outlet is in the open state, and the refrigerant flows from the solenoid valve double tube end outlet pipe to the freezer chamber evaporator and back to the compressor to achieve the refrigeration cycle.

Frequently Asked Questions (FAQ)

1. What is the model number and application of this truck solenoid valve?
The model number is 23013325. This is a proportional solenoid valve for Volvo trucks and compatible equipment. It controls hydraulic flow direction for functions such as steering, lifting, suspension, or transmission.

2. What is a truck solenoid valve?
A truck solenoid valve is an automatic basic component used to control fluid (hydraulic or pneumatic). It is an actuator. It controls the direction of hydraulic flow. Factory and vehicle mechanical devices are generally controlled by hydraulic systems, so solenoid valves are widely used.

3. How does a truck solenoid valve work?
The valve has a closed chamber with through‑holes to different pipes. In the middle is a valve body (spool). Two electromagnets are on either side. When the left coil is energized, the valve body moves left, opening one outlet. When the right coil is energized, it moves right, opening the other outlet. Return springs center or default the valve when both coils are off.

4. What happens when the solenoid valve coil is NOT energized (working state one)?
Under return spring force, the spool rests on the double tube end. The double tube end outlet is closed. The single tube end outlet is open. Fluid flows from the single tube end outlet to the actuator and then returns. In a refrigeration context, this achieves the normal refrigeration cycle.

5. What happens when the solenoid valve coil IS energized (working state two)?
The spool overcomes the return spring force and moves to the single tube end. The single tube end outlet is closed. The double tube end outlet is open. Fluid flows from the double tube end outlet to the actuator (e.g., a freezer evaporator) and then returns. In a refrigeration context, this achieves an alternate cycle.

6. What is the difference between an on/off solenoid valve and a proportional solenoid valve?
An on/off valve is either fully open or fully closed – like a light switch. A proportional valve (like the 23013325) can vary flow or pressure gradually based on the electrical current. More current = more open. This allows smooth, precise control – essential for truck steering, suspension, and transmission functions.

7. What does "spring return" mean in a solenoid valve?
"Spring return" means that when electrical power is removed from the coil(s), a mechanical spring pushes the spool back to a default position. This is a safety feature. If electrical power fails, the valve returns to a known state (e.g., closed or open to tank) rather than staying in an uncertain position.

8. Is this solenoid valve only for Volvo trucks?
The 23013325 is specified for Volvo trucks and is a Volvo proportional solenoid valve. It may fit other trucks or industrial machinery that use the same valve specifications (flow, pressure, voltage, cavity). Always verify your original part number before ordering.

9. Does the truck solenoid valve 23013325 come with a warranty?
Yes. Flying Bull provides a 1‑year warranty against manufacturing defects. Damage caused by contamination (dirty oil), incorrect installation (wrong torque, missing seals), overpressure, voltage issues, moisture ingress, or physical damage is not covered.

10. Is this valve a direct replacement for the original Volvo part?
Yes. The 23013325 is manufactured as a direct replacement for the original Volvo truck solenoid valve. It matches the original mounting dimensions, port sizes, flow characteristics, pressure rating, voltage, and connector type. Always verify your original part number before ordering.

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