Patent ID: 8557197
Filing Date: 2013-10-15
Classification: B01L,F16J,F16K

Abstract:
1. A metering device comprising: a piston rod; a cylinder; wherein said piston rod and said cylinder extend along an axial direction and are movable relative to one another in this axial direction; a radial sliding seal subassembly configured to seal a radial gap between the cylinder and the piston rod and movable relative to the cylinder, wherein the radial sliding seal subassembly comprises: a sealing component which is used to demarcate a metering cavity in the cylinder alterable by relative movement of the piston rod and the cylinder; and at least one pretensioning component co-operating with the sealing component, wherein the sealing component comprises: a sealing section extending in the axial direction and in the circumferential direction having a sealing surface facing in a first radial direction and a pretensioning surface, said sealing surface being at least in the axial direction in sliding contact with a working surface formed on an inner side of the cylinder facing towards the piston rod, and said pretensioning surface facing in a second radial direction opposite to the first radial direction and in engagement with the pretensioning component, wherein the pretensioning component comprises: a spring carrier, and a plurality of separately formed radial spring segments that are resiliently supported at least in the radial direction on the spring carrier said spring segments having a pretensioning axial section in contact with the pretensioning surface and thereby being configured to transfer a radial pretensioning force to the pretensioning surface, wherein at least one radial spring segment has a first end and a second end and is connected in the region of the first end to the spring carrier and is formed with a pretensioning axial section in the region of the second end, axially interspaced from the first end, and in contact with the pretensioning surface, and wherein the spring carrier comprises a carrier section extending in the circumferential direction from which at least one radial spring segment projects in the axial direction away from the alterable metering cavity.