What is a Direct Acting Solenoid Valve?

In the hydraulic and pneumatic system of construction machinery, direct-acting solenoid valve is a key control element. The following will introduce in detail what is a direct-acting solenoid valve, and its important role in construction machinery.

 

The basic principle of direct-acting solenoid valve

The basic principle of direct-acting solenoid valve is actually very simple. It is a valve that is used to control the flow of liquid or gas. It works by relying on electromagnetic force to control the opening and closing of the valve.

 

There are two key components here: the solenoid coil and the spool. The solenoid coil is a winding around an iron core that creates a magnetic field when current is passed through it. This magnetic field causes the spool to be attracted or repelled, just as a magnet attracts or repels a piece of iron.

 

When current passes through the solenoid, the spool is attracted, opening the valve and allowing liquid or gas to flow through. When the current stops, the magnetic field disappears and the spool returns to its original position, closing the valve and stopping the flow.

 

Therefore, the principle of direct-acting solenoid valve is to use electromagnetic force to control the action of the valve, so as to control the flow of liquid or gas, which is very useful in engineering machinery and many other fields.

 

Structure of direct acting solenoid valve

Similar to a diesel solenoid valve, a direct-acting solenoid valve usually consists of components such as a solenoid coil, spool, seat and housing. The solenoid coil is located on the outside of the valve and generates a magnetic field by energizing the valve. The spool is located inside the solenoid coil and is connected to a spring. When the solenoid coil is energized, the spool is magnetically moved, thus changing the state of the fluid passage. The valve seat is the end point of the movement of the spool, which determines the closed position of the valve.

 

Application in construction machinery

Direct-acting solenoid valves are widely used in construction machinery, mainly used to control the hydraulic system and pneumatic system to realize various critical operations, and at the same time, cooperate with the operation of other components such as starter motor and alternator. The following are the main applications of direct-acting solenoid valves in construction machinery:

 

Hydraulic system control: Direct-acting solenoid valves are widely used in the hydraulic systems of construction machinery to control the flow of hydraulic fluid. They can control the action of the hydraulic cylinder, such as lifting, tilting, clamping, pushing and pulling, etc., to ensure that the machinery to perform a variety of tasks.

 

Pneumatic System Controls: Pneumatic systems are also common in some construction machinery and are used to control the flow of air. Direct-acting solenoid valves play a similar role in the pneumatic system, used to control the movement of pneumatic cylinders, such as opening and closing the mechanical arm, control pneumatic brakes, etc. with other diesel engine parts work.

 

Valve control: construction machinery usually need to control the flow of various liquids or gases, such as hydraulic fluid, coolant, fuel, etc.. Direct-acting solenoid valves are used to control the flow of these fluids in and out to ensure the normal operation of the machinery.

 

Braking system: In some construction machinery, direct-acting solenoid valves are also used to control the braking system. They can help adjust the size and timing of the braking force to improve the safety and maneuverability of the machinery.

 

Automation: With the development of automation technology, direct-acting solenoid valves are widely used to realize the automation of construction machinery. They can be used to control automated tasks such as automatic loading, unloading, sequencing and positioning.

 

Important Features and Advantages

Direct-acting solenoid valves offer important features such as fast response, precise control, high reliability and long life. They quickly switch the status of fluid passages, making them suitable for applications that require frequent operation and precise control. Their high reliability and long life make them one of the indispensable components in construction machinery.

 

Maintenance and care

Regular maintenance and servicing is necessary to ensure that direct-acting solenoid valves work properly. This includes operations such as cleaning the valve body, checking the solenoid coil, and replacing seals. Improper maintenance or neglect may result in solenoid valve failure, which in turn affects the performance and reliability of construction machinery.

 

In conclusion, direct-acting solenoid valve is a common control element in construction machinery, which controls the state of fluid passage through electromagnetic force, with the advantages of precise control, high reliability and long life. Understanding its working principle and application areas, as well as regular maintenance and repair, will help ensure the smooth operation and long-term reliability of construction machinery.