Abstract: An inwardly tensioning plain compression ring for sealing a rotating part with respect to a fixed part. The plain compression ring separates a positive pressure region from a low pressure area and has, in reference to the circumference, two opposite ends, designed as a joint or lock and which can be connected. A radial, inner circumferential surface, or at least at an axial circumferential surface of the plain compression ring has a ring shape lubrication groove for accommodating a supplied lubricant which comes from the positive pressure region. The plain compression ring has at least one ring shaped lubrication groove which is not completely circular, but has a closed end and an open end. The open end of the lubrication groove opens into an overflow area which is in flow connection with a leakage area of the joint or the lock.

Abstract: A piston ring for a reciprocating compressor is disclosed, including a one-part annular sealing ring with an arcuate outer surface and having a gap between butt ends of the sealing ring. A joint seal seals the gap symmetrical, having two limbs that extend at both sides in the peripheral direction over an angular range of 20° to 180° and having a radially outwardly directed, arcuate limb outer face. The joint seal includes a contact part that extends at both sides in the peripheral direction and projects beyond the limbs in the axial direction. The sealing ring and the joint seal are adapted to each other such that, when assembled, the joint seal rests laterally against the sealing ring via a stop and runs along the gap and covers same in the peripheral direction.

Abstract: A seal assembly for a reciprocating piston system is provided that compensates for uneven wear rates between the ring components of the seal assembly by initially sizing a portion of the width of the sealing ring larger than the width of the annular recess in the cover ring, this portion at least partially overlapping the gap in the cover ring but not the gap in the sealing ring.

Abstract: A blowout preventer (BOP) is provided in which each ram includes a primary rope packing seal formed from a first length of rope packing extending horizontally across the front face, rearwardly and then either or both of upwardly and downwardly over the top and/or bottom portion of the ram. The primary rope packing seal is held in, so as to protrude radially outwardly from, a continuous first groove formed in the ram. The continuous first groove is adapted to accommodate joined abutting ends or overlapping ends of the first length of rope packing. A secondary rope packing seal and a circumferential rope packing seal may be provided on the ram.

Abstract: A seal assembly 20 for a groove 12 or seal gland in a relatively displaceable machine part 10 for sealing an axial machine part 18 extending therethrough comprises a pair of annular seal elements 30 and a support element 50 disposed between the annular elements 30 and a radially extending wall 14 of said groove 12. The annular seal elements 30 have an axial slot 32 therein and a key portion 36 extending therefrom, shaped to engage the axial slot 32. The seal elements 30 are arranged in an inverted nesting relationship to provide superior sealing characteristics when biased toward the machine part 18 by said support element 50.

Abstract: A packing seal is provided which is intended in particular for reciprocating piston engines and which can be placed into a circumferential groove of a piston of such a reciprocating piston engine. The packing seal includes a first segment ring (1), which has at least two sealing segments (3) and locking segments (4) arranged between them in alternating order. These locking segments (4) and sealing segments (3) taper wedge-shaped in opposite directions radially inward and outward, respectively. In addition, the packing seal includes at least one additional or second segment ring (20) which also has at least two sealing segments (23) and locking segments (24) arranged between them in alternating order. The sealing segments (23) and locking segments (24) both taper radially inward in this case. The locking segments (24) extend over a larger arc area than the sealing segments (23).