Abstract: A seal of a pressure chamber, in which the pressure chamber has boundary walls movable toward one another and an annular gap, filled up by a radial seal, between a first and a second of the boundary walls, these boundary walls being implemented as seal surfaces radially contacted by the radial seal and the seal being mounted so it is axially movable in relation to both radial seal surfaces and the radial seal also radially adjoining the inside of the pressure chamber, which is subjected to pressure, predominantly without being covered and able to support itself on the opposite axial side on a support connected to one of the boundary walls, is to be able to have a pressure damping effect for pressure pulsations within the pressure chamber.

Abstract: An impeller-and-seal unit for a liquid pump includes a plastic impeller, a metal hub affixed to the impeller and arranged to receive and contact a pump shaft, a slide ring seal assembly including a slide ring and a counterring received in a recess of the impeller and being in sliding contact with the slide ring. The metal hub has a radial extension which projects radially outwardly and which is received in the recess, forming a bottom thereof. The counterring has a radial end face which is in a direct contact with the radial extension.

Abstract: Method of oil and gas tightly fastening a diaphragm made of an elastomer material with respect to the tappet as well as the adjusting element within a hydrostatic valve clearance adjusting device and configuration of the same. Clamping rings are form-lockingly connected with the fastening end of the diaphragm already during the vulcanization process. The thus manufactured installable unit is fixed in the tappet in the correct position orientation by means of an installation tool. Moreover, the structural configuration of the clamping rings is described as well as that of the elastic diaphragm.

Abstract: A valve tappet assembly has a hollow tappet body, a valve clearance adjusting element spaced from the inner wall face of the tappet body and having a circumferential groove, an elastomer annular diaphragm having an outer edge zone adjoining the inner wall face of the tappet body and an inner edge zone adjoining the outer face of the valve clearance adjusting element, a first radially inwardly projecting circumferential rib provided at the inner edge zone and received in the circumferential groove; an outer and an inner clamping ring circumferentially pressing the outer edge zone against the inner wall face at the tappet and, respectively, the inner edge zone against the outer wall face of the valve clearance adjusting element to provide respective circumferential sealing zones; and a second radially inwardly projecting circumferential rib in the inner edge zone, situated adjacent the first rib and being pressed into circumferential engagement with the outer wall face of the valve clearance adjusting element a