Pinch valve
A pinch valve controls or stops flow by compressing a flexible sleeve or tube. The process medium passes through that flexible element, and mechanical, pneumatic, or hydraulic force reduces its cross-section. This differs from a diaphragm valve: the pinch-valve sleeve forms the flow passage itself, while a diaphragm acts against a body seat or weir. Selection should evaluate sleeve construction, chemical compatibility, abrasion, differential pressure, cycling frequency, and whether the duty requires modulation or full isolation.
Application and duty
Flow control or isolation where a flexible wetted passage is appropriate; sleeve selection must be based on the actual medium and operating conditions.