Pinch valves can be used in countless applications but are predominantly installed in lines where powders are pneumatically conveyed, in slurry lines, for food grade applications where no material traps are permissible, for a corrosive medium, for a fibrous product, for liquids containing solids or even as a shut-off valve on a bulk road tanker.
A pinch valve is closed in two ways, by using a pressurised gas or liquid that has a higher pressure than that within the pipeline, thereby squashing the sleeve together which forms a tight seal. Alternatively, the sleeve is pressed together mechanically using a handwheel, an actuator or even a stepper motor.
these pinch valves are closed using either compressed air or a pressurised liquid. The gas or fluid commonly has to have a pressure of about 2 bar above the line pressure to ensure a tight seal. When the pressure in the housing increases above the line pressure, the sleeve begins to compress until it forms a tight seal. These pinch valves are suitable for maximum line pressures of 6 bar, with the larger bore valves dropping to 3 bar.
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