Carrier Corporation

Max P Waser

Thomas M Zinsmeyer

A rotary vane pump has restricted fluid communication between the inlet and the trapped volume for about 4.degree. of rotation beyond when the vane starts past the inlet. Similarly there is restricted communication between the trapped volume and the outlet for about 4.degree. of rotation prior to the vane reaching the outlet. Additionally, in the preferred embodiment, the trapped volume is in restricted communication with the outlet prior to its isolation from the inlet.

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Bauma, Switzerland

Max P Waser