High pressure fluid seal with controlled leakage

Claim 1

A FLUID CIRCULATING UNIT COMPRISING A HOUSING HAVING A CHAMBER, A FLUID RECEIVING CAVITY AND A FLUID RECEIVING COMPARTMENT, MEANS FOR CIRCULATING FLUID UNDER PRESSURE ENCLOSED WITHIN SAID CHAMBER, AN INLET PORT FOR ADMITTING FLUID TO SAID CHAMBER, AN OUTLET PORT FOR DISCHARGING THE FLUID FROM SAID CIRCULATING MEANS AND CHAMBER UNDER PRESSURE, A SHAFT EXTENDING THROUGH SAID HOUSING FOR DRIVING SAID CIRCULATING MEANS, A FIXED MATING RING MOUNTED ON SAID SHAFT IN SPACED RELATIONSHIP TO SAID CIRCULATING MEANS, SAID FIXED MATING RING HAVING A MATING FACE, A DISK MOUNTED ON SAID SHAFT, SAID DISK BEING SPACED APART FROM SAID FIXED MATING RING AND LOCATED IN SAID FLUID RECEIVING CAVITY, A FLUID PASSAGE CONNECTING SAID CHAMBER WITH SAID FLUID RECEIVING CAVITY, AN AXIALLY MOVABLE SEALING RING DISPOSED IN SAID FLUID RECEIVING CAVITY, SURROUNDING SAID SHAFT AND FORMING A FLUID PASSAGEWAY BETWEEN SAID SEALING RING AND SAID SHAFT, SAID SEALING RING HAVING A CIRCULAR SEALING FACE CONFRONTING SAID MATING FACE, A FRONT PRESSURE SURFACE ADJACENT SAID CIRCULAR SEALING FACE FORMING A FIRST FLUID RESTRICTIVE PASSAGWAY BETWEEN SAID FRONT PRESSURE SURFACE AND SAID MATING FACE, AND A REAR PRESSURE SURFACE OPPOSITELY DISPOSED FROM SAID FRONT PRESSURE SURFACE FORMING A SECOND FLUID RESTRICTIVE PASSAGEWAY BETWEEN SAID REAR PRESSURE SURFACE AND SAID DISK TO PROVIDE FLUID COMMUNICATION BETWEEN SAID FLUID RECEIVING CAVITY, SAID FLUID PASSAGEWAY AND