| 摘要 |
The method includes making a fluid communication channel (44), which has a selectively variable cross-sectional area profile, in the inner face of a ga s spring cylinder (32) so as to permit fluid communication at different selective rates bypassing around or across the piston assembly (68) of the g as spring (52) as the piston assembly (68) moves within the cylinder (32). Preferably the cross-sectional area profile of the fluid communication chann el (44) is initially substantially the same throughout the length of the channe l (44) and is thereafter selectively changed in certain portions of the channe l (44) so as to restrict and in some instances block gas or fluid flow through the fluid communication channel (44).
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