Pneumatic valves are inarguably the most important components of any pneumatic system. When it comes to designing fluid power circuitry, there are various factors to consider such as choosing the appropriate air control valves for the purpose of regulating system pressure and direction and rate of the flow.
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They are an array of components that play an important role in ensuring that the amount of air, rate, and pressure is controlled as it passes through the pneumatic system. In a compressed air system, pneumatic valves benefit in providing precise and safe control of actuators.
Types of Pneumatic Valves
Here are some of the most commonly used types of pneumatic valves:
What really classifies this type of pneumatic valve is its ability to switch the direction of the airflow. For instance, in a two-way directional valve, the valve can be either closed or open, this means that the airflow will be either enabled or disabled. An actuator moves the valve spool which lets a port to undertake an open or closed position. The valve spool has to be released for the valve to return to its original position. All of this operation is done by a spring. These directional valves are classified as two-way and commonly called as sprig offset valves.
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Resting State: Open Versus Closed
Two-way directional spring offset valve can undertake different positions (either open or closed) if the connected actuator is not active. In a closed resting state, the airflow is impassable. In an open resting system, air flow is easy through the valve. Given the fact that in three-way valves one port is opened at any scenario, the reason behind blocked airflow is a closed resting state. Therefore, no pressure will move until or unless the device is switched on.
Two-Way Directional Valve
This valve enables the air to pass in two directions and via two ports (closed or open). If the valve ports are closed, the air won’t pass through the valve and on the contrary, air can pass in opposite direction or from the first or second port through the valve.
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Three-Way Directional Valve
It has three ports and there is a different purpose for each of the port. Valve is connected to the actuator or other devices with the help of the first port, airflow is connected to the second port, and the third port is specifically used as an exhaust exit. The third port closes when first and second ports are in use. It is because the air is moving through the valve. The actuator is enabled to vent exhaust when second port is closed while first and third ports are open.
Four-Way Directional Valves
In a four-way directional valve, there are four separate ports: one port is used for connecting with a pressurized airflow, two ports are used for connecting to actuators, and one port is used as an exhaust passageway. There is no denying that four-way directional valves are the most used types of valves in pneumatic systems. It is because of the reason that four distinct paths enable the valve to inverse the motion of a basic cylinder or motor. Sometimes, an additional port is also added to provide dual pressure and this means that one of two kinds of pressure can be applied by the valve or can even alternate between the two ports according to the demand.
Applications of Pneumatic Valves
It goes without saying that pneumatic valves are widely known for their adaptability, effectiveness, and reliability. For proper functioning of any system, pneumatic valves are known for playing a pivotal role. It is because machine creates power forcing compressed air out of it. Needless to say, pneumatic valves assist in managing, controlling, and handling the amount of gases that flows through a system. There are various applications of pneumatic valves that are quite evident in every sector of the market. However, some of the uncommon applications include accurate selectable flow control, enhanced efficiency with the help of latching solenoid valves, and check valves. It is worth mentioning here that check valves are known for playing a major role in industrial processes and other safety applications. All in all, from operating cylinders to various other industrial applications, pneumatic valves are quite commonly and effectively used.
The Bottom Line
Choosing the right pneumatic valve matters a lot because if it is too big then you’ll be wasting a lot of air and money and if it is too small then there are high chances that the actuator won’t work properly. It goes without saying that pneumatic valves are more important than they may seem to be. Therefore, choose them according to the right demand and with proper knowledge and consultation.