Patent ID: 8511219

Claim:
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 within the internal chamber and in sealing relation with the housing, the primary seal including first and second elastomeric members adapted to sealingly engage the plunger, the first and second elastomeric members being spaced apart from one another a distance greater than or equal to a maximum stroke of the plunger; a secondary seal located within the internal chamber and adapted to sealingly engage the plunger, the secondary seal being spaced apart from the primary seal; a barrier fluid chamber containing a barrier fluid in contact with the primary seal and the secondary seal; and a pressurizing device to maintain a pressure of the barrier fluid at a magnitude greater than a peak pressure of a fluid pumped by the plunger such that the pumped fluid is restricted from entering the barrier fluid chamber.