Patent ID: 8087635
Filing Date: 2012-01-03
Classification: F16K

Abstract:
1. A pneumatic pinch valve, comprising: a lever and a pressing piece, a fluid tube receiving space being formed between the lever and the pressing piece; a main body defining a cavity therein that comprises an opening whose size accommodates a plurality of outside diameters of fluid tubes and is used for installation of and pinching actions on each of the fluid tubes; a piston located in the cavity of the main body, in which the cavity comprises a first cavity, which is pressurized when a fluid tube is pinched, and a second cavity, and the pressing piece being positioned in the second cavity and supported on the piston; at least one pinching action control feature that is located within the second cavity between the piston and the pressing piece and is used to protect the fluid tubes by limiting one or more amounts of compression of the fluid tubes from the pinching actions on the fluid tubes, wherein a pneumatic discharge port configured for both discharging a gas from and supplying the gas to the pneumatic pinch valve for the pinching actions rather than comprising a first pneumatic port for inlet and a separate pneumatic port for outlet of the gas for the pinching actions.