The very simple principle consists of an elastic sleeve which is compressed by a pressurized fluid (most often compressed air, possibly pressurized water) and which thus blocks the flow of the product carried inside the sleeve.

When the pressure between the valve body and the outside of the sleeve is released, the sleeve returns to its initial position, providing full passage, without restriction and without pressure loss.

Thanks to a fabric frame, the sleeve collapses when closed in a preferred direction.

A perfect seal is obtained, the grains or materials suspended in the fluid are coated in the sleeve without hindering its closure.

These valves are fully automatic and have multiple advantages:

Low weight.

High robustness and resistance to chemicals.

Safe to use.

Small footprint and easy assembly.

Economical to purchase and to maintain.

Effective in all situations: the fluid conveyed can be liquids, gases, dust, semi-solid materials, explosive products, etc. 

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Dimensions of the PREMAFLEX pinch valve series PQVF

DN	L	D	DI
40	156	150	40
50	167	165	45
65	184	185	60
80	226	200	75
100	282	220	95
125	350	250	120
150	420	285	145
200	559	340	195