Close clearance viscous fluid seal system

Claim 1

A pumped fluid actuating system comprising, in combination, a reciprocating positive displacement pump having pressure viscous fluid circulating means, pumped fluid chamber, low pressure pumped fluid source means and a high pressure pumped fluid receiver means; a plunger arranged interior of said reciprocating positive displacement pump and adapted to move reciprocally therein in a continual series of compression strokes and return strokes to effect discharge of pumped fluid at a high pressure from said pumped fluid chamber during each of the compression strokes and intake of pumped fluid into said pumped fluid chamber during each of the return strokes; an annular close clearance viscous fluid sealant seal zone annularly surrounding at least a portion of said plunger at an area discrete from the pumped fluid chamber; floating piston seal means separating said pumped fluid chamber from said annular close clearance viscous fluid sealant zone contacting said pumped fluid chamber on one side thereof and responsive to changes in pressure in said pumped fluid chamber and contacting said annular close clearance viscous fluid sealant seal zone situated between the plunger and the pump body on the other side thereof to impose the pumped fluid pressure on the viscous fluid sealant; said pressure viscous fluid circulating means connected to said annular close clearance viscous fluid sealant seal zone to effect substantially constant delivery of viscous fluid sealant thereto; control means operatively connected to said pressure viscous fluid circulating means to effect delivery of viscous fluid sealant into and out of the annular close clearance seal zone.