Abstract: A sliding vane positive displacement pump with a spring biased mechanical vane acutating system. The pump includes a case having an inlet and an outlet with a liner having a cam-shaped inner surface eccentrically disposed therein. A rotor having radially oriented slots is rotatably positioned within the case, and radial holes interconnect opposite pairs of slots. A vane is slidingly positioned in each slot. A vane actuator assembly, including a hollow sleeve with a plinger reciprocably disposed therein, is installed in each slot. A spring is positioned in the sleeve and bears against one end of the plunger and a closed end of the sleeve. The spring biases the sleeve and plunger so that each is in contact with the inwardmost edge of a vane. Each plunger defines a slot therein, and each sleeve defines a transverse hole therethrough corresponding to the slot. A pin, pressed into the transverse hole, extends through the slot for preventing the plunger and sleeve from becoming separated.

Abstract: A sliding vane positive displacement pump with a spring biased mechanical vane actuating system. The pump includes a case having an inlet and an outlet with a liner having a cam-shaped inner surface eccentrically disposed therein. A rotor having radially oriented slots is rotatably positioned within the case, and radial holes interconnect opposite pairs of slots. A vane is slidingly positioned in each slot. A vane actuator assembly, including a hollow sleeve with a plunger reciprocably disposed therein, is installed in each slot. A spring is positioned in the sleeve and bears against one end of the plunger and a closed end of the sleeve. The spring biases the sleeve and plunger so that each is in contact with the inwardmost edge of a vane. Each plunger defines a slot therein, and each sleeve defines a transverse hole therethrough corresponding to the slot. A pin, pressed into the transverse hole, extends through the slot for preventing the plunger and sleeve from becoming separated.