| 摘要 |
A rollover pressure/vacuum relief valve (10) and an actuation device (100) therefor: the valve comprises a valve body (18, 20) and a rollover gravity element (52, 58) pivoted in the valve body and which actuates the valve when the orientation of the valve body changes with respect to gravity. The actuation device comprises a valve body engagement member (102) and a rollover gravity element engagement part (104). The latter is mounted on the member. The actuation device has tow positions. In a first, said part (104) and member (102) can engage said element (58) and body (20) respectively. In a second position, the element is displaced by part to actuate the valve (10) and close it. A catch (72) on the device releasably retains the device in engagement with the valve in said ssecond position. The device is used when testing the tank in which the valve and a fire engulfment valve are fitted to test seals and operability of the valves.
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