Laminar Pte Ltd Singapore

Laminar Pte Ltd


Plastic Diaphragm Valves

Group 1 1
Group 1 1


Plastic diaphragm valves are widely used in industries that require precise flow control. They are designed with a flexible diaphragm that allows for efficient regulation of fluid flow rates. One of the main advantages of plastic diaphragm valves is their excellent chemical resistance, which makes them ideal for handling corrosive substances. The diaphragm is a barrier between the fluid and valve body, preventing any contact that could lead to corrosion or contamination.

Another notable feature of plastic diaphragm valves is their resistance to clogging. Their streamlined flow path and smooth interior surfaces minimise the risk of debris buildup, making them suitable for industrial applications involving viscous fluids or those prone to sedimentation.

The body design of plastic diaphragm valves varies to cater to different application requirements. Each design has unique benefits, such as improved sealing capabilities or enhanced flow control. Standard designs include straight-through, weir-type, and saddle-type configurations. Weir-type diaphragm valves are ideal for conveying liquids with suspended solids.





DN15 – DN300


Water | Wastewater | Raw Water | Sea Water | Chemicals


Controlling pure and ultra pure liquids | High viscosity and solid content | Chemical dosing | Water treatment


  • Available in uPVC, CPVC and Glass Filled Polypropylene
  • Various diaphragm material options
  • Reliable for regulating neutral, aggressive, gaseous and liquid media
  • Contact-free with the medium
  • Reliable and durable
  • Flexible sealing element
  • Optional position indicator
  • Choice of high grade, abrasion resistant EPDM, FKM, or elastomer backed PTFE diaphragm
  • Spigot, flanged, or true union socket/threaded & SR threaded ends


The weir-type diaphragm valve is a specialised valve designed to control the flow of viscous liquids with precision and efficiency. It is named after its unique valve body, which features a weir or raised ridge that helps streamline fluid flow through the valve. Some commonly used valve body materials for weir-type diaphragm valves are cast iron, stainless steel, cast steel, bronze, brass, PVC, ductile iron, CPVC, and U-PVC.

This type of valve is particularly well-suited for applications where viscous liquid flow needs to be carefully regulated. The weir design helps to prevent any blockages or disruptions in the flow, ensuring a smooth and consistent movement of the liquid.

One of the key advantages of using a weir-type diaphragm Valve is its ability to handle high-viscosity fluids without compromising performance. The streamlined flow created by the weir design allows for efficient control and minimal pressure drop, even when dealing with thick or sticky substances.

In addition to their functionality, these valves are known for their durability and reliability. The diaphragm, the main sealing component, is made from robust materials that can withstand harsh operating conditions and provide long-lasting performance.

A weir-type diaphragm valve creates a sealed chamber within the valve body. This sealed chamber keeps the fluid from leaking, ensuring precise flow rate and fluid pressure control.

The valve is actuated by a metal or plastic diaphragm, pushed open when pressure is applied on one side and closed when pressure is applied to the other. The diaphragm and the presence of the weir in the valve body help regulate and modulate the flow of liquid through the valve.

Weir-type diaphragm valves are relatively simple to operate. In addition, they are highly reliable and durable, making them a popular choice for applications involving viscous liquids or those prone to sedimentation.

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