Abstract: 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. An annular chamber is defined 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. The stationary assembly includes a stationary seal ring having a stationary sealing face, and a first secondary seal between the stationary seal ring and the housing. The inboard seal further 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 and a second secondary seal between the rotating seal ring and the shaft.

Abstract: An improved packing gland construction for a fluid cylinder that includes an angular elongated resilient sealing member disposed in contact with the piston rod of the cylinder. An end of the sealing member facing the interior of the cylinder is provided with a flexible lip and the internal pressure within the cylinder acts to urge the lip inwardly into sealing engagement with the piston rod. The outer end of the sealing member is provided with a tapered wiper which rides on the piston rod and acts to remove foreign material from the rod. The outer surface of the sealing member is formed with a circumferential groove which receives a ring, and the inner end of the ring bears against an abutment on the cylinder while the outer end of the ring is engaged by a cap that is secured to the end of the cylinder. The cap has an annular inclined surface which engages and urges the wiper inwardly against the piston rod.