Pinch valves are designed to control the flow of media. They are often used in industries such as cement, iron and steel, mineral processing, and food processing. A pinch valve is made up of three main parts: the body, the sleeve, and the end connectors. These components are often manufactured from various materials, including metals, plastics, and elastomers. A pinch valve can be operated by a pneumatic actuator or by a manual handwheel.
A pinch valve works by isolating the media, preventing clogging. The inner part of the valve is a bushing that is filled with fluoro rubber or silicone resin. This bushing is subjected to continuous load tests to determine the service life of the product. This type of technology provides a high degree of reliability and ensures that the media flows through the pinch valve in a smooth manner.
The body of a pinch valve is made from either natural elastomer, such as nitrile, or synthetic elastomer, such as EPDM or Viton. The material is selected on the basis of its abrasion resistance, corrosion resistance, and its ability to be compatible with the medium. When a pinch valve is used in applications that require a higher temperature range, it is usually made of EPDM. The rubber pinch valve material can also be customized to suit a variety of applications. A pinch valve is an ideal solution to handling almost any medium.
The rubber sleeve is the most important component of the pinch valve. The sleeve has an excellent wear and abrasion resistance, and it is the primary component that contacts the medium. It is therefore very important to select the right sleeve material to maximize durability.
The pinch valve sleeve is typically hand-built, but it can be fabricated with different types of elastomers, including butyl, nitrile, and silicone. These materials are all designed to resist abrasion and provide a long lifetime. The rubber sleeve is then fitted into the valve body, and it is lubricated with a lubricant paste. When the pinch valve is pressurized, the sleeve is compressed in the centre. When the pinch valve is fully compressed, the air or hydraulic pressure pushes the sleeve downward, forming an effective seal.
A pinch valve is a simple design that offers several advantages over conventional types of valves. They are inexpensive, have good physical properties, and are easy to maintain. However, their operation requires a proper differential pressure and a certain amount of control pressure. This means that the pinch valve cannot be completely closed.
In order to increase the service life of a pinch valve sleeve, it is important to control the differential pressure. When a pinch valve is operated at a lower pressure, it can be easier to open and close the sleeve. Keeping the pinch valve’s control pressure lower will prevent sleeve deformation. A pinch valve’s sleeve is very sensitive to high pressure differentials, so it is important to keep this in mind when choosing a pinch valve.