Things You Must Know About Diaphragm Valve And How It Works

KDV Valves and the innovation in these early valves lay in their ability to create a leak-tight seal, a principle still central to modern diaphragm valves. Their understanding of water pressure and flow dynamics is evident in the extensive aqueduct systems, which relied on various valve designs, including precursors to diaphragm valves, to distribute water efficiently across cities.

With all the amazing benefits it can do, Check out how diaphragm valves work and see if they are the perfect choice for your needs.

Diaphragm valves use a flexible diaphragm connected to a compressor by a stud which is molded into the diaphragm.

Diaphragm valves operate using a flexible diaphragm as their core component, which serves as both the sealing element and the mechanism for controlling fluid flow. The diaphragm is typically made from durable materials like rubber, elastomers, or synthetic polymers, selected based on their compatibility with the fluids and operating conditions. This diaphragm is securely connected to a compressor (or actuator plate) through a stud that is molded into the diaphragm. This design ensures a reliable and efficient connection between the moving parts.

When the valve is operated, the compressor moves the diaphragm, pressing it tightly against the weir or seat within the valve body to form a leak-proof seal and stop the flow of fluid. When the compressor retracts, the diaphragm lifts away from the seat, allowing fluid to flow freely. This motion is controlled with precision, making diaphragm valves ideal for applications requiring exact flow regulation.

Instead of pinching the liner closed to provide shut-off, the diaphragm is pushed into contact with the bottom of the valve body to provide shut-off.

Diaphragm Valve Types and How it Works
There are two main categories of diaphragm valves: one type seals over a weir and the other (sometimes called a “full bore or straight-through” valve) seals over a seat. In general, straight-through diaphragm valves are used in on-off applications and weir-type diaphragm valves are used for control or throttling applications.

Basic Operation

Closed State: When the valve is closed, the actuator pushes the compressor down, compressing the diaphragm against the valve seat (either a weir or the valve body base) and creating a tight seal.
Open State: To open the valve, the actuator retracts, lifting the compressor and allowing the diaphragm to relax and move away from the seat, creating a flow passage.
Throttling (Weir Valves): Weir-type valves can partially compress the diaphragm against the weir, proportionally restricting the flow for control and modulation.

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