Pinch valves are full bore, fully ported valves used to control fluid flow in a system. Their name refers to their pinching effect, which is used to prevent the flow of fluid. These valves come in two different types, Non-wetted and Internal. Depending on their location, pinch valves are a great option for a variety of applications.
Throttle pinch valves are an easy, low-cost way to control air and mass flow. They have very low friction, do not clog, and are among the lightest types of valves. Installation is quick and easy, and maintenance is minimal. Pinch valves are rated for a range of throttling capacities between 10 and 95% of maximum flow capacity.
Non-wetted
Non-wetted pinch valves are made of a non-wetted body and are suitable for a variety of applications. They feature a DIN-style electrical connector, removable coils, and a panel mount bracket. They can handle a wide range of media and are used for high-pressure applications.
Internal
Internal pinch valves are designed to control flow in a piping system. They are actuated by a controlling mechanism that closes both the top and bottom of the valve to reduce the flow. This makes them ideal for controlling slurries with pinch valves low pressures and temperatures. This article covers the different types of pinch valves, their construction, typical applications, and how to maintain them.
External
When choosing pinch valves for a medical instrument, the material they are made of is important. External pinch valves feature a single wetted material, while internal pinch valves have multiple wetted materials and are more difficult to adjust. The material they are made of will influence how easy they are to clean and adjust, as well as how long they will last.
Cost
Pinch valves are commonly used in many applications and can be made from a variety of materials. External types of pinch valves are usually made of PVC or silicone tubing. These types of valves are typically inexpensive but will wear out over time, requiring frequent replacement. Pinch valves made from elastomeric materials are usually more expensive but have better life expectancies.
Application
Pinch valves are used in a variety of applications in both the chemical and pharmaceutical industries. They are commonly used in devices that handle bulk goods. These include milk, fruit juice, chocolate, pulses, mash, and feed stuff. They are also useful in the purification of water and waste water.
