| 摘要 |
PCT No. PCT/GB89/00593 Sec. 371 Date Jan. 14, 1991 Sec. 102(e) Date Jan. 14, 1991 PCT Filed May 26, 1989 PCT Pub. No. WO89/11612 PCT Pub. Date Nov. 30, 1989.An isolator which includes an isolator shaft, an isolator closure, e.g., a valve plate, carried by the isolator shaft, a hydraulic actuator for the isolator shaft, an auxiliary shaft equipped with at least one element for driving at least one extraneous device, e.g., a limit switch, and a coupling drivingly interconnecting the isolator shaft with the auxiliary shaft. The hydraulic actuator includes a casing which has an exterior mounting flange at one end for connection to the isolator and internally houses a hydraulic ram and a lever arm assembly, with the ram being articulated at one end to the lever arm assembly and at the other end to the end of the casing remote from the flange. The coupling is designed to convert any possibly uneven motion of the isolator shaft to a true rotary motion of the auxiliary shaft, with the latter being a tubular body rotatably mounted on a tube member fixed to the isolator, and with the isolator shaft being connected to the tubular body by a universal joint located interiorly of the tube member.
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