A fluid end assembly comprising a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section comprises a housing having a bore formed therein for housing a reciprocating plunger. Fluid is prevented from leaking around the plunger by a packing seal assembly. The packing seal assembly comprises one and only one packing seal.

Provided is a gasket mounting structure capable of preventing a gasket from being mounted in a wrong direction. The gasket mounting structure is configured such that, when a jig 200 is inserted into a gasket 100 from a large-diameter inner peripheral surface portion 124 side, a small-diameter outer peripheral surface portion 210 is press-fitted into an inner peripheral surface of a seal projection 122 to result in a state in which the gasket 100 is held by the jig 200 and, when the jig 200 is inserted into the gasket 100 from a small-diameter inner peripheral surface portion 123 side, the small-diameter outer peripheral surface portion 210 does not reach a position at which the small-diameter outer peripheral surface portion 210 can come into contact with the seal projection 122.

The present invention relates to the field of push rods, in particular to a waterproof and dustproof electric push rod, where a waterproof and dustproof module includes a single-lip oil seal, a first anti-swing ring, a piston oil seal and a second anti-swing ring, which are arranged in sequence in a retraction direction of an inner tube. When the inner tube retracts, since inner rings of the single-lip oil seal, the first anti-swing ring, the piston oil seal and the second anti-swing ring are tightly attached to an outer sidewall of the inner tube, the single-lip oil seal plays a role in scraping off dirt (dust, silts, etc.) on the surface of the inner tube, and the internal piston oil seal can be waterproof and dustproof.

The present invention relates to the field of push rods, in particular to a waterproof and dustproof electric push rod, where a waterproof and dustproof module includes a single-lip oil seal, a first anti-swing ring, a piston oil seal and a second anti-swing ring, which are arranged in sequence in a retraction direction of an inner tube. When the inner tube retracts, since inner rings of the single-lip oil seal, the first anti-swing ring, the piston oil seal and the second anti-swing ring are tightly attached to an outer sidewall of the inner tube, the single-lip oil seal plays a role in scraping off dirt (dust, silts, etc.) on the surface of the inner tube, and the internal piston oil seal can be waterproof and dustproof.

The invention relates to a ring seal for sealing a gap between two parts that can be moved axially to one another, with a cross-sectional profile, which is constant in the circumferential direction and has a symmetrical design with respect to a radially oriented axis of symmetry (S), and with a dynamic sealing surface arranged radially outside or radially inside on the cross-sectional profile, and a groove base area arranged radially opposite the sealing surface, wherein that the sealing surface has a first central section (I) which, in the cross-sectional profile, has a radius R of R<B/2 with respect to an axial width B of the ring seal, and the sealing surface further has a second and third section (II, III) which enclose the first central section between them, and that the sealing surface in the region of the second and third sections (II, III) is in each case embodied as a planar annular surface which is oriented at an angle (α) of 60 to 85 degrees with respect to the axis of symmetry of the cross-sectional profile.

A sealing member according to the present invention is a sealing member against a synthetic oil containing an ester-type additive, and includes 95.0% by mass or more and 99.5% by mass or less of a para-phenylene diisocyanate-based polyurethane and 0.5% by mass or more and 5% by mass or less of a same compound as the ester-based additive. The sealing member according to the present invention has a smaller friction coefficient and more excellent deformability than conventional sealing members and that can inhibit swelling caused by a synthetic oil.

A pressure-medium-actuated brake cylinder of a rail vehicle has a housing, a translationally movable brake piston rod extending through a bore in a housing base, a guide ring which is received in the bore, encloses the brake piston rod and is intended for guiding the brake piston rod in the bore, and at least one sealing ring which is received in the bore, encloses the brake piston rod and is intended for sealing an interior of the housing with respect to a space outside the housing, wherein the guide ring and the at least one sealing ring are designed as a guide and sealing ring combined to form a structural unit.

A system includes a fluid end having a fluid end face and a recess extending toward a base. The system also includes a pressure ring extending from the fluid end face, the pressure ring having a pressure ring bore diameter larger than a fluid end bore diameter. The system further includes an adjacent ring coupled to the fluid end, the pressure ring positioned between the adjacent ring and the base, wherein at least one fastener extends through an aperture of the adjacent ring to couple the adjacent ring to the fluid end. The system includes packing material positioned within at least a portion of the pressure ring bore, the packing material positioned such that axial movement toward the fluid end is blocked by the base.

An elastic body includes an annular main body portion to be disposed in an annular gap, a seal lip portion extending from a portion, closer to an object to be sealed, of the main body portion and being to be in contact with an inner member, a flange portion extending outwardly from an end, opposite to the object to be sealed, of the main body portion and including a first side closer to the object to be sealed, the first side being to be in contact with an outer member, a side lip portion extending from the end opposite to the object to be sealed in a direction away from the object to be sealed, and a projecting portion formed circumferentially on a second side, opposite to the object to be sealed, of the flange portion. The side lip portion has a back surface configured to be in contact with the projecting portion in response to the side lip portion being pressed by a mating member disposed opposite to the object to be sealed.

A piston rod sealing system for a reciprocating machine (1), including a piston rod (8) having a first end (8a) connected to a piston (9), and a second end (8b) connected to a crankshaft (10), the piston rod (8) being received within a housing (7); and a sealing unit (11) provided between the piston rod (8) and the housing (7), and having a first lateral surface (12a) facing the first end (8a) and a second lateral surface (12b) facing the second end (8b). The sealing unit (11) includes a first rod seal (13) positioned in the vicinity of the first lateral surface (12a) and a second rod seal (14) positioned between the first rod seal (13) and the second lateral surface (12b), the sealing unit (11) being fixed within the housing (7). The second rod seal (14) includes a liquid injection pipe (15).