Patent ID: 8191460

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 an elastomeric member adapted to sealingly engage 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, the secondary seal including an O-ring and a wiper positioned between the O-ring and the plunger, the O-ring acting to bias the wiper into engagement with the plunger; 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.