Alluminum Pinch Valves are linear motion valves that can be used to start,stop and throttle media through a system.Pinch valves are low maintenance,low weight,and can be used in systems requiring explosion proof line closure.While the design of  provides extensive advantages for use in sterile lines and in situations where product purity is a high priority,these same design features do create some disadvantages.Due to their elastomeric bodies, pinch valve is not viable in situations where the transport media is at a high temperature.They are also not recommended for services that require high pressure flow,and for use with gases.
Advantages
1. Very Clean
2. Excellent drainage
3. Minimal turbulence
4. Low airborne contaminants
5. Low maintenance
6. Low weight
7. Can be used in explosion-proof lines
8. Inexpensive
Disadvantages
1. Cannot be used in high temperature applications
2. Cannot be used in high pressure applications
3. Cannot be used with gas media
Method of Control:
1.  use a liner motion method of control.
2. The disc is a flexible material liner,similar to a diaphragm.
3. The stem of the pinch valve has a free-moving connection to a moving closure bar,called a compressor,which is located directly above the liner.
4. As the hand wheel is turned,the compressor lowers the liner to squeeze the liner against the bottom support to close the valve.
5. The pressure of the media in the valve can help in starting or stopping the flow.
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