A pinch valve is a full bore or fully ported valve that is used to stop fluid flow. A pinch valve uses the pinching effect to obstruct fluid flow. It has two primary components: the pinching disc and a carryover volume. Each of these components plays a crucial role in controlling fluid flow.
About pinch valves
Pinch valves can handle a wide range of fluids. They are typically used in chemical process applications, where they can withstand high pressures and temperatures. However, they are also suitable for use in mining. Pinch valves are available in a variety of configurations, so they can fit a variety of industries.
Pinch valves can be used in an open or closed mode. A pinch valve that is open will pass 100 percent of the flow, while a pinch valve that is closed will restrict flow. For the best flow control, the valves should be equal in size, so the pressure difference is minimal.
Common applications
Pinch valves are used in a variety of processes that involve entrained solids. They have a rubber sleeve that closes drop-tight around the solids to prevent them from clogging. This pinch valves makes them safer than other valves, and they offer a complete bore for the flow media. In addition, they provide 100% tight shut-off.
A pinch valve works by clamping a tube between its two parts. The pressure applied by the media is greater than the spring force, which forces the valve to close. A spring element inside the valve acts as an actuator and opens or closes the valve when negative pressure is applied.
Components
Pinch valves have several components. One of these components is the sleeve, which can either collapse or create a reliable seal. The sleeve can also trap materials that would otherwise block other valve mechanisms. The other two components are the spring and the actuating force.
The valve sleeve is typically made of rubber. This material is resistant to abrasion from corrosive media and slurries. Some are reinforced with fiber or polyurethane for improved abrasion resistance. The sleeve is usually the only part of the valve that needs replacement. In some cases, the sleeve is also equipped with a tag to secure a clamping bar.
Carryover volume
Carryover volume is the amount of fluid that is left behind after a pinch valve has changed state. This is normally not an issue, but when a three-way pinch valve is used, carryover volume can be a problem. It can mix with other fluids and be wasted in the flushing process. One solution to this problem is to design internal pinch valves, which minimize the volume between the pinch point and the Y-shaped combination point.
Another solution is to use a solenoid valve. These valves can switch between samples, reagents, and cleaning solutions quickly and easily. This is especially convenient in flow cytometry. These valves are easy to install and maintain, and the Y-shape diaphragm offers smooth and reliable performance.
Cost
The price of pinch valves is relatively low compared to other valves. These valves are solenoid-operated and used for controlling the flow of gases and liquids. These valves have no dead volumes, so the fluid only comes into contact with the inside of the tubing. Many operators have experienced a rapid return on their investment after purchasing one. To learn more about pinch valves, visit Linquip.
Normally, pinch valves are made of flexible PVC or silicone tubing. These materials are cheap, but silicone wears out quickly and must be replaced. For a higher life span, consider elastomeric material. These valves can last much longer, but you must be prepared to pay more up front.