A weir valve is a commonly used diaphragm valve. In a weir valve’s design, the diaphragm component presses the raised saddle or lip to create a sealing action. The elevated lip completely closes the diaphragm with reduced stress. Due to the diaphragm’s sturdy construction, manufacturers can use it in high-pressure and vacuum applications. Read More…
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International Polymer SolutionsIrvine, CA | 949-458-3731
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ITT Industries, Engineered ValvesLancaster, PA | 717-509-2200
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Weir-type diaphragm valves excel in regulating fluid flow, throttling, and controlling extremely small flow rates. Weir-type diaphragm valves use a two-piece compressor to make a tiny opening at the valve's center. Due to the potential for contamination and sludge buildup on the saddle, Weir-type diaphragm valves typically handle clean liquids and gasses.
Working Principle of the Weir Valve
The weir valve has a flexible diaphragm attached to a compressor. The stem is attached to the compressor. As the stem rises to boost the flow rate, the compressor moves with it. The diaphragm is attached to the compressor, which also causes it to travel higher. The flow of fluid increases as the diaphragm rises. To slow or stop the flow, the stem rotates and moves downward. The diaphragm is then pressed to either slow down or stop the fluid flow after the stem passes the downward motion to the compressor.
Considerations for Selecting a Weir Valve
- Before selecting a valve, calculate the flow rate and the valve flow coefficient. Knowing the valve flow coefficient is essential to estimate the size of the weir-type diaphragm valve that can allow fluid at the right flow rate.
- Pressure drop is the variation in pressure between the valve's input and discharge. If the ratio of pressure drop to the overall system pressure drop is very small, a fast-acting weir valve will be beneficial.
- Weir-type diaphragm valves can be adjusted to handle a range of flow rates. This exact range is influenced by the actuator's precision and size and by the compressor's geometry, valve body, and diaphragm. Knowing the range of flow rates the weir valve must handle is helpful.
- Determine the required volume the valve will have to handle. The temperature and pressure influence this volume at the inlet and outlet. The fluid's flow rate, viscosity, and specific gravity also affect the volume. The weir valve's capacity, size, and pressure drop are easier to determine with these values.
Advantages of Weir Valves
- Weir-type diaphragm valves are lined extensively to protect them from chemical deterioration. This allows them to transport dangerous or radioactive fluids.
- These valves provide a bubble-tight service.
- In viscous fluids, Weir-type diaphragm valves perform effectively.
- They are suitable for on-off and flow-throttling applications.
Disadvantages of Weir Valves
- A weir valve will quickly wear out if it’s not made of corrosion-resistant material.
- The Weir-type diaphragm valve may not function properly at an extremely high pressure of more than 200 psi.
- If utilized in highly polluted throttling services, the diaphragm may corrode.
Applications of Weir Valves
- Weir valves are used in the power generation industry and to process chemicals.
- Weir-type diaphragm valves are employed in the piping systems for de-mineralized water.
- They are employed in pharmaceutical manufacturing processes.
Choosing the Correct Weir Valve Manufacturer
For the most beneficial outcome when purchasing Weir valves from a Weir valve supplier, it is important to compare several companies using our directory of Weir valve suppliers. Each Weir valve supplier has a business profile page highlighting their areas of experience and capabilities, along with a contact form to directly communicate with this company for more information or request a quote. Review each Weir valve business website using our patented website previewer for a better understanding of what each company specializes in. Then, use our simple RFQ form to contact multiple Weir valve businesses with the same form.