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Weir Valves

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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…

Weir Valves A weir valve is a type of diaphragm valve in which the flow passage includes a weir, or a notch with a horizontal edge through which a substance flows. In the open position, the diaphragm lifts up and allows a substance to flow freely through the valve. Once in the closed position, the diaphragm closes down on the weir, shutting off flow partially or completely.
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Huntersville, NC  |  800-325-1405

Burkert Fluid Control Systems is a global process supplier of high-quality customized fluid control systems and products, including diaphragm valves.

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Burkert Fluid Control Systems $$$

Irvine, CA  |  949-458-3731

We make a wide range of products that are engineered solutions for you! Our diaphragm valves are number one in the industry when it comes to quality and production time.

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International Polymer Solutions $$$

Arlington Heights, IL  |  800-733-1344

Yamada® Corporation has been a leading producer of fluid handling products for over 60 years. As a leader in pneumatic pumping technology, Yamada® is known in industries worldwide for its innovative products, superior quality and unmatched reliability. Yamada’s ISO 9001 certification ensures quality procedures for manufacturing bellows pumps, dampeners and more.

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Yamada America, Inc. $$$

Wilmington, MA  |  800-282-8823

Watson-Marlow Fluid Technology is a leader in the diaphragm valve industry. Our expert team works side by side with our customers to ensure that our products fit their needs. For more information about our diaphragm valves, visit our website or give us a call today!

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Watson-Marlow Fluid Technology Group $$$

Lancaster, PA  |  717-509-2200

We manufacture a variety of butterfly control valves—stainless steel, lug, wafer butterfly valves, standard, custom, shut-off and more. ITT knows the various chemical, fluid and gas processes and engineers products accordingly. Our brand names include Fabri-Valve®, Richter™, Pure-Flo®.

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ITT Industries, Engineered Valves $$$
placeholder image Burkert Fluid Control Systems International Polymer Solutions Yamada America, Inc. Watson-Marlow Fluid Technology Group ITT Industries, Engineered Valves

weir valve

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.

weir valve parts

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.
manual weir valve

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.

Weir Valve Informational Video

 
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