Different Types of Pneumatic Valves and How They Work
In many industrial applications, pneumatic systems that depend on the force of compressed air to transmit power exist from diesel engines to pressure power tools. One of the components responsible for the control in the rate, pressure, and amount of air as it moves through a pneumatic system is pneumatic valves. And this type of pneumatic valve may be found at the heart of the device based on the type of pneumatic system used and other components within a given application.
What houses multiple variants are functional directional control valves that control the direction of air flow or inhibit the flow. Here are different types of them that are classified based on the mechanism by which ports (entry and exit) are opened or closed, number of ports they possess, and the number of flow paths they create.
Spring Offset
This classification refers to the approach in which air-flow direction is shifted. Let’s take a two-way directional valve as an example where the valve is either open or closed. For each port to figure an open or closed position, an actuator budges a valve spool into position. In order to release the valve spool and put the pneumatic valve back to its previous position, a spring frees the spool. This manner describes a spring offset valve.
Two-Way Directional Valve
This type passes air in two directions through two valve ports that can be opened or closed. If the ports are closed, no air can flow through the valve. On the other hand, if opened, air may move from the first port through the valve then through the second port, or in the opposite direction.
Three-Way Directional Valve
Having three ports, with each serving different purposes, three-way directional valves are frequently connected to actuators in cylinders, or in pairs connected to double-acting cylinders. How does it work? The first port connects the valve to an actuator or another device. The second port connects to an air-flow. The third port serves as an exhaust exit. So, when the second port is closed while the first and third ports are opened, the actuator vents exhaust.
Four-Way Directional Valve
Among the most common types of valves that are found in pneumatic systems, four-way directional valves have four ports that effectively reverse the motion of a basic or motor cylinder. Two of the ports connect to actuators, one serves as an exhaust pathway, and one connects to a pressurised air-flow. Sometimes, an additional port is added to the valve making it a five-ported valve used in providing dual pressure. This means that the valve can apply one of the two kinds of pressure in an alternate manner depending on the required application. Alternatively, this five-ported four-way valve can use its other port as the secondary exhaust port.
Learn more about pneumatic valves here at Master Mac 2000!
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About The Author
Stuart Havill
Stuart Havill is the owner and manager of MasterMac2000, Queensland's largest privately owned pneumatic and process valve company.
With his early working career as a maintenance fitter for Boral in 1992, Stuart has spent his life in the field of pneumatics and process equipment. He gained extensive experience in plant design, maintenance, repairs, fabrication, and site management.
In 1996, he transitioned to a pneumatic sales technician role at MasterMac2000, where he excelled in key account management, providing cost-effective solutions, and managing a sales team of 9 employees.
Since 2002, Stuart has been the manager at MasterMac2000, overseeing the company's growth and establishing it as a leader in pneumatic automation and process valve engineering. His expertise spans customer training, CRM setup, industrial compressor sizing and installation, and turn-key project management.
Under Stuart's leadership, MasterMac2000 has been servicing the industry since 1988, with 5 full-time sales representatives covering northern rivers NSW, Queensland, Northern Territory, and PNG. The company prides itself on providing the best-priced solutions to all customers in the marketplace.
View Stuart’s LinkedIn profile to learn more about his expertise in pneumatics and process equipment.