| 摘要 |
<p>PCT No. PCT/GB91/01876 Sec. 371 Date May 18, 1993 Sec. 102(e) Date May 18, 1993 PCT Filed Oct. 25, 1991 PCT Pub. No. WO92/08056 PCT Pub. Date May 14, 1992.A hydraulic actuator for an isolator, comprising a casing (1) having a flange (1a) to be mounted to the isolator to be driven, a lever arm assembly (2) connected at each end thereof to a respective one of a pair of identical double acting cylindrical rams (3), the other ends of the rams being respectively connected to opposite ends of the casing remote from the flange, wherein the identical rams are arranged to operate in opposite directions, the radial load exerted by one ram being equal in magnitude but opposite in direction to the radial load exerted by the other ram.</p> |
