Balanced shaft seal

Claim 1

AN IMPROVED SEAL ARRANGEMENT FOR PREVENTING ESCAPE OF HOT, HIGH PRESSURE LIQUIDS OF VARYING TEMPERATURES AND VARYING PRESSURES ALONG A ROTATING SHAFT, PAST A STATIONARY WALL STRUCTURE, SAID ARRANGEMENT COMPRISING, IN COMBINATION: A STATIONARY ANNULAR BEARING ELEMENT HAVING AN ANNULAR SEALING SURFACE AND ADAPTED TO BE SECURED TO A STATIONARY WALL STRUCTURE AND FURTHER ADAPTED TO SURROUND A ROTATING SHAFT, AN ELONGATED ROTATABLE BUSHING ELEMENT HAVING AN ANNULAR SEALING SURFACE AND ADAPTED TO SURROUND A ROTATING SHAFT AND POSITIONED IN AXIAL ALIGNMENT AND HAVING ITS SEALING SURFACE IN ABUTMENT WITH THE SEALING SURFACE OF SAID ANNULAR BEARING ELEMENT, A ROTATABLE COLLAR ELEMENT IN AXIAL ALIGNMENT WITH AND SPACED A LIMITED DISTANCE FROM THE OTHER END OF SAID BUSHING ELEMENT AND ADAPTED TO SURROUND AND BE FIXEDLY ATTACHED TO A ROTATING SHAFT, SAID BUSHING ELEMENT OPERATIVELY LINKED TO SAID COLLAR ELEMENT FOR ROTARY MOVEMENT THEREWITH AND FOR AXIAL MOVEMENT WITH RESPECT THERETO, A LIQUID SEALING MEANS POSITIONED BETWEEN SAID BUSHING ELEMENT AND SAID COLLAR ELEMENT, A RESILIENT MEANS POSITIONED BETWEEN SAID BUSHING ELEMENT AND SAID SEALING MEANS TO URGE SAID BUSHING ELEMENT AGAINST SAID STATIONARY ELEMENT WITH A PREDETERMINED FORCE AND SAID SEALING MEANS INTO ENGAGEMENT WITH SAID BUSHING ELEMENT AND SAID COLLAR ELEMENT, SAID BUSHING ELEMENT PROVIDED WITH A PRESSURE SURFACE OPPOSED TO ITS ANNULAR SEALING SURFACE AND CONSTRUCTED AND ARRANGED TO BE IN COMMUNICATION WITH ITS ANNULAR SEALING SURFACE, SAID ANNULAR SEALING SURFACE HAVING ABOUT TWICE THE EFFECTIVE AREA AS THE OPPOSED PRESSURE SURFACE TO BALANCE THE FORCES OF A HIGH PRESSURE LIQUID OF VARYING TEMPERATURE AND PRESSURE WHICH IS CONTAINED WITHIN SAID SEAL ARRANGEMENT AND MAINTAIN THE FORCE SUBSTANTIALLY CONSTANT AT ITS PREDETERMINED LEVEL.