| 摘要 |
The choke arrangement comprises an elastic choke ring which consists of a single piece with a gap formed by a parting joint. The choke arrangement: further comprises a support ring which is arranged directly adjacent to the choke ring in the axial direction, with the support ring serving, among other things to cover over the gap of the choke ring. An advantage of the choke arrangement with an elastically resilient choke ring is to be seen wherein the choke ring reacts to dynamic pressure changes and thereupon changes its sealing properties. A peak in pressure produces an increased difference in pressure at the choke arrangement, whereby the elastic choke ring is pressed against the sliding surface of a piston rod and effects an increased sealing action, so that the pressure peak cannot propagate to a sealing ring placed after the choke arrangement. The choke arrangement thus behaves analogously to a frequency selective filter known from electrical engineering in that high-frequency pressure changes are sealed off, whereas static or slowly varying pressure components are not sealed off. |
