| 摘要 |
<p>PCT No. PCT/GB93/00181 Sec. 371 Date Sep. 16, 1994 Sec. 102(e) Date Sep. 16, 1994 PCT Filed Feb. 28, 1993 PCT Pub. No. WO93/19316 PCT Pub. Date Sep. 30, 1993A valve closing mechanism comprises a stand-off arm (18) adapted for attachment to the valve body, a lever arm (22) incorporating a fitting (24) for connection to the valve spindle (16), and an actuator (26) acting between the stand-off arm (18) and the lever arm (22) for effecting angular oscillatory movement of the lever arm, said fitting comprising a one-way drive transmitting arrangement whereby the spindle is rotated when the lever arm is displaced in one direction but remains stationary when the lever arm is displaced in the opposite direction.</p> |
