Pinch valves are used for controlling the flow of media in a variety of industries. They can be used in liquid or solid applications. They are ideal for handling systems that contain large suspended solids, such as slurries or powders. They have an effective throttling range, usually between 10 and 95% of the rated flow capacity.
The pinch valve is a relatively inexpensive and reliable valve design. Its main components include the rubber sleeve, the body/housing, and the pinching mechanism. It is primarily used in applications where the media needs to be isolated from the environment. Typically, the sleeve is reinforced with fiber or polyurethane to increase its strength. The liner is also reinforced to keep moving parts outside the fluid stream.
The valve sleeve is normally made from rubber, though the material can vary. It is abrasion resistant, which means it will not wear quickly. It is advisable to choose a sleeve that is suited for the application, such as natural rubber or silicon. It should also be able to withstand temperature fluctuations.
The body of the pinch valve is made of a durable, abrasion resistant material, such as EPDM or NBR. It should also be lightweight. In addition, the lining should be abrasion resistant. This pinch valves will allow the sleeve to resist scratches and wear from corrosive materials.
The actuation of the pinch valve is triggered by the application of compressed air. This pushes the rubber sleeve downward, closing the pinch valve. The force required to close the tube will vary based on the tubing’s dimensions and the environmental conditions. The pressure differential must be precisely measured.
The body of the pinch valve is constructed with smooth walls to minimize turbulence and line vibration. It should be light enough to allow the user to operate it with minimal effort. In addition, the lining should be resistant to abrasion, since it will come in contact with the media.
When the pinch valve is in an open state, it only comes into contact with the media from the input to the output. The pinching mechanism is located at the center of the valve. The pinching element closes to a nominal height of 0.75mm. However, this can be adjusted by a tag on the outer sleeve, which allows the clamping bar to be attached.
The pinch valve can be operated manually by turning a hand wheel. It can also be powered by a high speed electric motor. The actuating force can be controlled through a solenoid. It should be noted that the force of the solenoid can be problematic when the tubing is softer or more fragile.
Pinch valves are an effective way to control the flow of abrasives and slurries. They are useful in medical applications, such as clinical analyzers, and in food processing. They also work well in sewage treatment. They are cost-effective, reliable, and simple to use. They are also very easy to install. They can be a good choice in a variety of industries, such as pharmaceuticals, chemicals, sewage, and even solid waste disposal.