Abstract: In order to provide a sealing device (15) for sealing a piston rod (8) of a reciprocating compressor (1), which provides good sealing properties at compressor standstill, which has a simple structure, which allows for a simple handling and which requires no external source of energy, the sealing device (15) comprises a number of first packing retainers (18), each retainer including a retaining opening (18a) in which a first packing ring (19) is arranged, a second packing retainer (20), including a retaining opening (20a) in which a second packing ring (21) is arranged, the second retainer (20) being positioned closer to the second axial device end (15b) than the number of first packing retainers (18) in an axial direction of the sealing device (15), wherein the second packing ring (21) is an uncut ring, comprising a continuous inner circumferential sealing surface (21a), wherein the second packing ring (21) is made from a material comprising a polymer, the material having a thermal expansion coefficient (?),

Abstract: In order to provide a sealing device (15) for sealing a piston rod (8) of a reciprocating compressor (1) at compressor standstill, which enhances the safety of operation, the sealing device (15) comprises a number of first packing retainers (18), each retainer including a retaining opening (18a) in which a first packing ring (19) is arranged, a second packing retainer (20), including a retaining opening (20a) in which a second packing ring (21) is arranged, the second retainer (20) being positioned closer to the second axial device end (15a) than the number of first packing retainers (18) in an axial direction of the sealing device (15), wherein the second packing ring (21) is an uncut ring, comprising a continuous inner circumferential sealing surface (21a), the second packing ring (21) being configured to seal the piston rod (8) at standstill of the compressor (1), wherein the sealing device (15) further comprises a support passage (28) having a first support passage end (28a), a second support passage end

Abstract: A scraper ring is provided with a plurality of sealing sections on the radially inner circumferential surface, each including a scraping edge, wherein the sealing sections are spaced axially apart from each other by inner circumferential grooves, with at least one recess provided on the circumference of the scraper ring which extends at least partially from a first axial ring end to a second axial ring end and extends at least partially in a direction different from the axial direction of the scraper ring. At least one drainage opening is provided on the outer circumferential surface of the scraper ring, which is connected to at least one inner circumferential groove for removing scraped oil from the inner circumferential grooves.

Abstract: Various embodiments of the present disclosure are directed to packing rings. In one example embodiment, a packaging ring is disclosed including a first axial ring end, a second axial ring end, at least three ring segments, a radial seal and at least one relief opening. Each of the at least three ring segments having a first segment end and a second segment end in a circumferential direction. A first segment end of one of the three ring segments including a first tangential contact surface and a first axial contact surface, the first axial contact surface facing towards the first axial ring end. A second segment end of another of the three ring segments including a second tangential contact surface and a second axial contact surface, the second axial contact surface facing towards the second axial ring end.

Abstract: Various embodiments of the present disclosure are directed to packing rings. In one example embodiment, a packing ring is disclosed including first and second axial ring ends, at least three ring segments, and at least three relief openings. The at least three relief openings each have a first relief opening end opening into the radially inside inner circumferential surface of the ring segment. The first relief opening ends of two relief openings arranged adjacent to one another in the circumferential direction are spaced apart from one another at a relief opening circumferential distance. The first relief opening ends are closer in the axial direction to the first axial ring end than to the second axial ring end and are spaced apart at a relief opening axial distance from the first axial ring end, which is 4% to 20% of the axial ring width of the ring segment.

Abstract: Various embodiments of the present disclosure are directed to packing rings. In one example embodiment, a packing ring includes a first axial ring end, a second axial ring end, at least three ring segments, and at least one wear opening, The at least one wear opening on at least one of the the at least three ring segments, and extends from a radially outside outer circumferential surface and/or the second axial ring end of the ring segment in the direction of a radially inside inner circumferential surface of the ring segment. A radially inside wear opening end of the at least one wear opening faces toward the inner circumferential surface and is spaced apart in the radial direction of the ring segment from the radially insider inner circumferential surface of the ring segment at a distance which is at most 40% of a radial ring height.

Abstract: A scraper ring is provided with a plurality of sealing sections on the radially inner circumferential surface, each including a scraping edge, wherein the sealing sections are spaced axially apart from each other by inner circumferential grooves, with at least one recess provided on the circumference of the scraper ring which extends at least partially from a first axial ring end to a second axial ring end and extends at least partially in a direction different from the axial direction of the scraper ring. At least one drainage opening is provided on the outer circumferential surface of the scraper ring, which is connected to at least one inner circumferential groove for removing scraped oil from the inner circumferential grooves.

Abstract: A support ring (12) and a piston ring (11) that are arranged in a peripheral groove (20) provided on a piston body (15), the axial width of the peripheral groove (20) being greater than the total axial width of the support ring (12) and of the piston ring (11), and the support ring (12) is arranged radially inwardly at a distance from the piston body (15), and the support ring (12) is relief-milled from the piston body (15) as an unbroken ring.

Abstract: To reduce leakage of pressure medium in a seal arrangement (1) comprising two sealing elements (8) that are pressed by a sealing medium against the piston rod (3) and against a wall (11) of a recess (10), it is provided that the radially interiorly disposed circumferential surface (24) constitutes at least one of the sealing elements (8) from a sealing surface (12) and a tributary area (23), a second end face (21) that faces away from the axial end (11) of the recess (10) connecting to the sealing surface (12), and a rigid cover ring (9) being provided that is positioned at least in part radially against the radially exterior circumferential surface (25) of the sealing element (8) and at least in part axially against the second end face (21) of the sealing element (8).

Abstract: In order to prevent the unloader from rotating relative to the valve seat, it is proposed to design the anti-rotation lock for the unloader as an anti-rotation locking disk (16) on which a central recess (17) is provided which has a cross-section that is diametrically opposed and matched to the valve nut (10), wherein the anti-rotation locking disk (16) is arranged with its central recess (17) in a non-rotational manner on the valve nut (10), and the outer contour of the anti-rotation locking disk (16) has a non-circular cross-section, and a central recess (24) is provided on the unloader (20), said central recess having an inner contour diametrically opposed and matched to the outer contour, and the unloader (20) is arranged with its central recess (24) on the anti-rotation locking disk (16).

Abstract: A support ring (12) and a piston ring (11) that are arranged in a peripheral groove (20) provided on a piston body (15), the axial width of the peripheral groove (20) being greater than the total axial width of the support ring (12) and of the piston ring (11), and the support ring (12) is arranged radially inwardly at a distance from the piston body (15), and the support ring (12) is relief-milled from the piston body (15) as an unbroken ring.

Abstract: In order to prevent the unloader from rotating relative to the valve seat, it is proposed to design the anti-rotation lock for the unloader as an anti-rotation locking disk (16) on which a central recess (17) is provided which has a cross-section that is diametrically opposed and matched to the valve nut (10), wherein the anti-rotation locking disk (16) is arranged with its central recess (17) in a non-rotational manner on the valve nut (10), and the outer contour of the anti-rotation locking disk (16) has a non-circular cross-section, and a central recess (24) is provided on the unloader (20), said central recess having an inner contour diametrically opposed and matched to the outer contour, and the unloader (20) is arranged with its central recess (24) on the anti-rotation locking disk (16).

Abstract: Conventional wiper arrangements with cut rings suffer from unavoidable leakage and, in particular in an embodiment as metallic wiper ring with a sharp wiping edge, scratch on the surface of the piston rod which can be damaged in this manner. In order to eliminate these problems, a wiper arrangement with a wiper ring 2 which is split in the circumferential direction and an L-shaped cover ring 3 which is split in the circumferential direction is proposed, wherein the splitting points 16, 15 of the cover ring 3 and the wiper ring 2 are arranged offset to each other in the circumferential direction, and the wiper ring 2 is arranged abutting axially as well as radially in the recess 4 of the L-shaped cover ring 3, and the radially inner circumferential surfaces 6, 7 of the wiper ring 2 and the cover ring 3 form a common radially inner wiping surface 10.

Abstract: Conventional wiper arrangements with cut rings suffer from unavoidable leakage and, in particular in an embodiment as metallic wiper ring with a sharp wiping edge, scratch on the surface of the piston rod which can be damaged in this manner. In order to eliminate these problems, a wiper arrangement is proposed in which the radially inner circumferential surfaces 6, 7 of the wiper ring 2 and the cover ring 3 form a common radially inner wiping surface 10 and on the cover ring 3 or the on the wiper ring 2, an intake surface 8 is provided which is adjacent to the wiping surface 10 and which is inclined radially outwardly at an angle ?, preferably between 2° and 15°, with respect to the wiping surface 10.