Patent ID: 7784395
Filing Date: 2010-08-31
Classification: F04B,F16J,Y10S

Abstract:
1. A sealing system for a pump having a plunger, comprising: a housing having an internal chamber adapted to receive a portion of the plunger; a primary seal located within said internal chamber in communication with a fluid being pumped and in sealing relation with said housing, said primary seal adapted to sealingly engage the plunger; a secondary seal located within said internal chamber and adapted to sealingly engage the plunger, the secondary seal being spaced apart from said primary seal; a barrier fluid chamber formed within said internal chamber and containing a barrier fluid in contact with said primary seal and said secondary seal; a pressure referencing device having an inlet port in communication with said pumped fluid and having an outlet port providing fluid at a pressure magnitude equal to a peak pressure of said pumped fluid, the pressure referencing device having a one-way check valve allowing pumped fluid to flow therethrough if the fluid pressure at said inlet port is greater than the fluid pressure at said outlet port, said one-way check valve restricting flow in an opposite direction; and a pressurizing device in communication with said fluid at said peak pressure and said barrier fluid, wherein said pressurizing device maintains a pressure of said barrier fluid at a magnitude greater than said peak pressure of said pumped fluid such that said pumped fluid is restricted from leaking past said primary seal.