Pinch valves are used in many industries. They are often found in wastewater treatment plants, chemical processes, power plants and mining. They are a great way to control the flow of slurries, abrasive media and liquid.
These valves are typically made from natural rubber, nitrile or plastics. They are available with different elastomeric qualities and with different end connections. They are generally easy to install and operate. They provide effective flow control and minimal pressure drop.
The pinch valve market is expected to grow at a CAGR of 4.15% from 2020 to 2027. This is primarily because of the introduction of advanced products and increased usage in industries. It is also expected to gain market share due to the increasing demand for sewage treatment facilities. These are primarily found in wastewater treatment plants, sludge discharge lines, and power plants. In addition, pinch valves are used in corrosion problems and to trap large particulates.
The pinch valve consists of three components, the rubber pinch valve pinching mechanism, the housing, and the elastomeric rubber sleeve. The pinching mechanism is a simple device that can pinch both sides of a pipe or tube. It is also designed to provide a smooth, easy shutoff.
The pinching mechanism can be in the form of a differential screw. The valve is also available in a pneumatic or electric version. The pneumatic pinch valve has higher pinch force. The sleeve and tube are molded of rubber and can be made of Nitrile (NBR), Viton or silicone. The sleeve may have threaded or bolted end connections. It is not recommended to use the pinch valve in vacuum applications. This is because there is a risk that the medium could enter the control circuit.
The elastomeric tube is the only component of the pinch valve that comes in contact with the flowing fluid. It should be flexible and abrasion-resistant. It should also be able to tolerate application temperatures. For these reasons, it is important to choose a pinch valve that meets the requirements of the particular industry.
The most common pinching bar material is food-grade rubber, but there are other types as well. The main factor to consider when choosing a pinch valve is the tube’s durometer. This can be measured by measuring the inside diameter of the pipe, which is referred to as “d”. For example, a tube with a durometer of 85 Shore A is compatible. A tube with a durometer of 50 Shore B will not work.
The elastomeric tube should also be lightweight. It should also be resistant to corrosive media. The liner should be smooth, to minimize turbulence and ensure an easy bubble-tight shutoff. It is also best to have an abrasion-resistant gasket.
The valve’s housing is a molded sleeve that is reinforced with fabric. It is a simple structure that makes it easy to replace the sleeve when needed. The tube is usually made of an elastomeric material, such as butyl or nitrile. The valves are packaged with care and caution, to prevent leaks.