| 摘要 |
An annular spacer 8 placed between the edge 1 and the cap 3 in order to define a chamber 16 closed in a sealed way by a first membrane 9 and by a second membrane 13 which are respectively pinched between the body and the spacer and between the latter and the cap. A hydraulic cushion is thus defined which is located between the spring 4 and the shutter element 10. <IMAGE>
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