Apparatus and Method for Regulating a Delivery Volume of a Displacement Pump

Abstract

Apparatus for regulating delivery volume of a displacement pump comprises a displaceable regulating piston and a spring element acting on the regulating piston in a displacement direction (x) thereof. The apparatus further comprises a means for applying a force to the regulating piston against an effective direction (a) of the spring element.

1 . An apparatus for regulating a delivery volume of a displacement pump, the apparatus comprising:
 a displaceable regulating piston;   a spring element acting on the regulating piston in a displacement direction of the regulating piston; and   a means for applying a force to the regulating piston against an effective direction of the spring element.   
     
     
         2 . The apparatus of  claim 1 , wherein the means for applying a force to the regulating piston comprises a solenoid valve. 
     
     
         3 . The apparatus of  claim 2 , wherein the solenoid valve comprises a rod that is movable in the displacement direction of the regulating piston and acts on the regulating piston. 
     
     
         4 . The apparatus of  claim 1 , wherein the means for applying a force to the regulating piston comprises a pneumatic valve. 
     
     
         5 . The apparatus of  claim 1 , wherein the means for applying a force to the regulating piston comprises a hydraulic valve, 
     
     
         6 . The apparatus of  claim 1 , wherein the means for applying a force to the regulating piston comprises an electric motor. 
     
     
         7 . The apparatus of  claim 1 , wherein the means for applying a force to the regulating piston comprises a second spring element. 
     
     
         8 . A system comprising:
 a displacement pump comprising a suction port and a pressure port; and   an apparatus coupled to the displacement pump for regulating a delivery volume of the displacement pump, the apparatus comprising:   a displaceable regulating piston;   a spring element acting on the regulating piston in a displacement direction of the regulating piston; and   a means for applying a force to the regulating piston against an effective direction of the spring element.   
     
     
         9 . The system of  claim 8 , wherein the means for applying a force to the regulating piston comprises a solenoid valve. 
     
     
         10 . The system of  claim 9 , wherein the solenoid valve comprises a rod that is movable in the displacement direction of the regulating piston and acts on the regulating piston. 
     
     
         11 . The system of  claim 8 , wherein the means for applying a force to the regulating piston comprises a pneumatic valve. 
     
     
         12 . The system of  claim 8 , wherein the means for applying a force to the regulating piston comprises a hydraulic valve. 
     
     
         13 . The system of  claim 8 , wherein the means for applying a force to the regulating piston comprises an electric motor. 
     
     
         14 . The system of  claim 8 , wherein the means for applying a force to the regulating piston comprises a second spring element. 
     
     
         15 . The system of  claim 8 , wherein the displacement pump is a vane pump. 
     
     
         16 . A method for regulating a delivery volume of a displacement pump, the method comprising the step of applying a force to a regulating piston against an effective direction of a spring element,
 wherein the spring element acts on the regulating piston in a displacement direction of the regulating piston.