John Crane Sealol Inc.

Fred Rathburn

Yoram Ringer

A seal for sealing a low pressure area from a high pressure area for containing a process fluid. The high pressure area is located along a rotatable shaft extending from a machine body. The seal includes an outboard seal positioned along the shaft and an inboard seal axially spaced along the shaft from the outboard seal to define an annular chamber between the inboard seal and the outboard seal for containing a buffer fluid. The inboard seal includes a stationary assembly attached to the machine body and having a stationary seal ring with a stationary sealing face. The inboard seal also includes a rotating assembly attached to the shaft. The rotating assembly includes a rotating seal ring having a rotating sealing face in sealing relation with the stationary sealing face. A drive collar is positioned between the stationary assembly and the machine body to maintain the sealing relation of the rotating and stationary sealing faces when the pressure of the buffer fluid is less than the pressure of the process fluid.

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Cranston, RI, United States of America

Fred Rathburn