There are three types of pinch valves: Membrane-type, Non-wetted, and Air operated. Each type is designed to control a certain flow rate, and the material used for a pinch valve should be able to withstand the temperature range of the application. The following article will discuss the different types of pinch valves and their characteristics.
Membrane-type pinch valves are typically single-use devices that are designed to minimize dead volume. They are ideal for applications that require washdown cleaning and sterilization procedures. Biopharm applications are increasingly embracing single-use technologies that can reduce the risk of cross-contamination. These valves are usually constructed with a closed membrane bag to contain wetted materials.
Membrane-type pinch valves can be actuated hydraulically or pneumatically. The valve is actuated by applying pressure medium to one or more openings in the valve. The opening in the valve closing piece is threaded, and can be attached to a pressure line. The valve’s base body is composed of two sections, 14 a and 14 b.
Membrane-type pinch valves have a wide range of applications. Their use in automated systems requires minimal maintenance. These valves are also ideal for isolation-type applications. These valves have a 20-msec response time, and only wetted component tubing. These pinch valves also have a DIN-style electrical connector.
Non-wetted and wetted pinch valves
Pinch valves are used for a variety of applications. These valves have a wide range of operating pressures and temperatures. They are popular with many industries, and they can handle a wide variety of media. Non-wetted pinch valves are often preferred in harsh media applications.
Pinch valves are commonly categorized by the type of stem and mechanism. The mechanism of the valve determines whether or not the internal sleeve seals, which is important depending on the flow characteristics of the system. There are three basic body types of pinch valves: open-body, closed-body, and pressure-assisted.
Non-wetted rubber pinch valves are designed for applications that require a leak-tight seal. Their internal sleeve is made of rubber or synthetic materials and has a smooth interior construction. They are operated manually or through pneumatic, hydraulic, or electrical actuators. The visit here internal sleeve is reinforced with fabric to minimize turbulence and line vibration. They are easy to replace and require minimal maintenance.
Air operated pinch valves
An air operated rubber pinch valve is a simple valve that controls the flow of fluid. It works by increasing the flow velocity of a fluid while keeping the flow media isolated from the environment. It is most often used for applications in which the flow media must be clean and sterile. Typical applications include medical equipment, clinical analyzers, laboratory equipment, and many others.
There are many different applications for air operated rubber pinch valves. They are a great solution for regulating and isolating abrasive and fibrous products. Their unique design allows them to work with a minimum pressure difference of two bars. They are made with high rebound elasticity so that they close easily and tightly, sealing out the product flow.
Another advantage of an air operated pinch valve is that they do not require an additional actuator. They operate by applying air pressure in a range of 30 psi, resulting in a 2-6 bar pressure range. Upon interruption of the air supply, the elastic rubber sleeve will release and the valve will open.