Pinch Valves

Pinch valves are a versatile solution for fluid control, functioning similarly to diaphragm valves but utilizing a flexible elastomeric sleeve inside the valve body. The sleeve is compressed or "pinched" by an external mechanism, such as a mechanical or pneumatic actuator, to regulate, control, or stop fluid flow. This unique mechanism makes pinch valves particularly effective for handling slurries, corrosive fluids, and abrasive materials, as the fluid only contacts the sleeve and not the valve body.

Construction

• Body Material:
  Typically made from cast iron, though stainless steel or aluminum may be used for more corrosive environments.
• Sleeve Material:
  Designed for durability in aggressive environments, sleeves are made from corrosion- and abrasion-resistant materials such as rubber (natural, neoprene, or EPDM) or PTFE (polytetrafluoroethylene). The sleeve is the only part exposed to the process fluid.

Applications

Pinch valves excel in low-pressure services and scenarios where complete flow isolation is critical. Common applications include:

• Chemical process industries
• Slurry handling systems
• Wastewater treatment
• Powder or granular material handling

These valves are ideal for systems requiring a total shutoff or for handling media containing particulates, ensuring no blockages or damage to the valve.

Recent Developments

Manufacturers have advanced pinch valve designs to operate under higher pressures and temperatures, ranging from 0 to 100 bar and up to 120°C. These innovations have expanded their application into industries such as mining and mineral processing.

Standards and Specifications

Pinch valves are not typically governed by API or ANSI standards. Instead, they are produced based on individual manufacturers' specifications, which may include pressure and temperature ratings, as well as material details tailored to specific uses.