Abstract: A multi-port pinch valve includes at least one primary conduit section having a bore for containing material transferred therethrough and a plurality of branch conduit sections in fluid communication with the primary conduit section. At least one of the branch conduit sections is defined by a respective branch conduit section wall having an outer sleeve portion, a flexible inner sleeve portion and a gap extending longitudinally along and around a portion of the branch conduit section wall. The gap is positioned between the outer sleeve portion and the inner sleeve portion. The valve also includes an injection mechanism in communication with the gap for injecting a flowing medium into the gap, such that the flexible inner sleeve flexes into a branch conduit bore. Methods of manufacturing the valve and controlling flow in a multi-port pinch valve are also disclosed.

Abstract: A valve seat in a knife gate valve is positively retained between a liner and a retaining ring.