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What are the common types of pneumatic valves?

Views: 211     Author: Site Editor     Publish Time: 2021-07-15      Origin: Site


The pneumatic valve is the one responsible for the control of pressure, speed, and air volume as it moves through the array of pneumatic system components. Pneumatic systems, which rely on the force of compressed air to send power, can be found in countless industrial applications, pneumatic pressure power tools diesel engines. What are the common types of pneumatic check valves? Let us look at it together.



53-1 pneumatic actuator


Common types of pneumatic valves

Functional directional control valve

Many functional directional pneumatic control valves are classified according to the number of inlets and outlets they have, the flow paths they create, which ports and mechanisms they open and close.


Two way reversing valve

The two-way directional valve passes through the air in two directions and can be opened or closed through two ports. If the valve port is closed, no air can flow through the valve. If the port is open, air can pass through the valve and through the second port, or move from the first port in the opposite direction.


Three-way reversing valve

A three-way directional valve has three ports, each of which serves a different purpose. The first port is used to connect the valve actuator or other equipment. The second port is connected to an air stream. The third port is used as an exhaust port. When the first and second ports are open and the third is closed, air moves through the valve device.

When the first and third ports are open and the second port is closed, the pneumatic actuator and electric actuators can discharge exhaust gas. Three-way valves are often connected to actuators in steel cylinders, or connected to double-acting cylinders using pairs.


53-2 electric actuators

Four-way reversing valve

A four-way valve has four different ports, two of which are connected to the actuator and one is connected to the pressurized air flow and, as an exhaust passage. They are among the most common types of valves in pneumatic systems because the four different paths allow the valve to effectively twist the movement of the motor or basic cylinder. Sometimes additional ports are added to a four-way valve, a five-port four-way valve.


Spring offset valve

This type of pneumatic valve classification refers to the way of switching in the direction of air flow. For example, in a two-way directional control valve, the valve is open (enable air flow) or closed (prevent air flow). For each port, so, assuming an open or closed position, the actuator moves the spool valve position. To release the valve spool, the pneumatic control valve and return to its previous position, the spring releases the spool. The function of the two-way reversing valve in this way is also called a spring-biased valve.


Bidirectional directional spring bias valve

In the two-way directional spring-biased valve, there are two positions, which can be assumed when the connected actuator is not yet activated: open or closed. In an open rest position is standard equipment, with air moving freely through the valve. In a closed resting state, air flow is blocked. In a three-way valve, one port is always open. In this case, a closed resting state usually results in blocking the air circulation port, so the pressure is not moving unless the device is turned on.

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