Materials
Sleeves are available in Pure Gum Rubber, Neoprene, Hypalon, Chlorobutyl, Buna-N, EPDM and Viton.

Valve Operation
The design principle is very simple - two mechanical pinch bars open and close the elastometer sleeve. The pinching action is on centerline, so the valve closes on a smooth venturi and is self-cleaning.

Read more about manual and air-operated Pinch Valves.

The Standard sleeve is a highly specialized component, and great care is taken to match the type of rubber used to provide a product that will give a long, maintenance-free service life. It's 100% full-port, and is like a pipe in-line. The flow remains streamlined when throttling.

Double Wall sleeves are called for in extremely abrasive slurries, and also high-pressure applications.  A double-wall sleeve provides 3-times the wear thickness of a standard sleeve. The port of a double wall sleeve is one line size smaller than its corresponding flange size. 

Cone sleeves are designed for control applications. They provide tighter control with a 20:1 turndown ratio and 0.89 recovery factor, along with an extra thickness of elastomer downstream for wear resistance.

Variable Orifice sleeves are designed for high-turndown control applications. They provide  a 29:1 turndown ratio and a special design that helps to eliminate cavitation. 

The sleeve is the heart of every Pinch Valve, providing the valve lining, flange gaskets, and seating surface all in one. Since the sleeve is the only wetted part of the valve, there is no need for expensive metal alloys to be used in the body of the valve. This design also eliminates fugitive emissions, and the packing and seats that are responsible for most valve maintenance.

Because the sleeve is the only wetted part, it is also the only replacement part. The sleeve is constructed much like a heavy-duty truck tire, with bias-ply, fabric- reinforced rubber providing the structural support of the sleeve.