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Types of Solenoid Valve and Their Application

Solenoid Valve

In today’s fast-paced world, machines have taken over most tasks once performed manually. Solenoid valves are one such innovation that has made it possible. These valves play a crucial role in controlling the flow of fluids, and their applications are widespread. This article will discuss different types of solenoid valves and their applications.

What is Solenoid Valve?

A solenoid valve is an electromechanically operated valve typically used to control the flow of liquid or gas. It has two main parts: an electromagnet and a plunger that can be retracted when current passes through the solenoid coil. When the current is switched off, a spring pulls back on the plunger, closing the valve. Solenoid valves come in all shapes and sizes and are often used for highly precise flow control applications in many industries.

Types of Solenoid Valve and Their Application

Two-way Solenoid Valve

The most popular type of solenoid valve is the two-way valve, which is typically used to control the flow of fluids. It has two ports- an inlet and an outlet- and a solenoid that controls the opening and closing of the valve. These valves are widely used in automotive, chemical, and agriculture industries.

Three-way Solenoid Valve

The three-way solenoid valve has two inlets and one outlet or one inlet and two outlets. It is mainly used for diverting flow from one path to another. These valves are commonly used in air compressors, fluid power circuits, and wastewater treatment plants.

Four-way Solenoid Valve

The four-way solenoid valve has four ports that can control two circuits simultaneously. These valves usually come with two inlets and two outlets or one inlet and three outlets. These valves are primarily used in food, chemical, and paper and pulp industries.

Direct-acting Solenoid Valve

Direct-acting solenoid valves are highly durable and require low power consumption. The valve operates directly, meaning there is a direct connection between the solenoid coil and the valve. These valves are used in low-pressure applications and are commonly used in irrigation systems and medical devices.

Pilot Operated Solenoid Valve

Pilot-operated solenoid valves come in two variants- internally or externally piloted. These valves are mainly used in high-pressure applications. The internally piloted solenoid valve has a small orifice that enables the admission of high-pressure fluid to the pilot chamber. On the other hand, the externally piloted solenoid valve has a separate pilot valve used for opening and closing the main valve.


In conclusion, solenoid valves are widely used in various industries, and understanding their types and applications is important. Two-way, three-way, and four-way valves are commonly used in various industries, while direct-acting and pilot-operated solenoid valves are widely used in low-pressure and high-pressure applications, respectively. Choosing the right type of solenoid valve can help get the desired results and maximise efficiency.

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