Abstract: Apparatus for testing an emergency valve in which a valve member (10) is movable by fluid-operated actuator (11) between a normal (open or closed) position and an emergency position (closed or open respectively). The apparatus comprises partial stroking means including means (32, 23, 22 to 13) for initiating emergency movement of the valve from its normal towards its emergency position, and means (13, 14) for returning it from a predetermined position intermediate the normal and emergency positions at its normal operating speed. The apparatus includes means for detecting the loss of the controlling electrical signal to the valve and a means (51) for detecting the correct operation of the valve and its associated operating components by measuring the pressure of fluid being released from or being applied to the actuator (11).

Abstract: Apparatus for testing an emergency valve in which a valve member (10) is movable by fluid-operated actuator (11) between a normal (open or closed) position and an emergency position (closed or open respectively). The apparatus comprises partial stroking means including means (32, 23, 22 to 13) for initiating emergency movement of the valve from its normal towards its emergency position, and means (13, 14) for returning it from a predetermined position intermediate the normal and emergency positions at its normal operating speed. The apparatus includes means for detecting the loss of the controlling electrical signal to the valve and a means (51) for detecting the correct operation of the valve and its associated operating components by measuring the pressure of fluid being released from or being applied to the actuator (11).

Abstract: An emergency valve controlled by an electrical signal on a control line which includes a partial stroke controller connected to the control line and providing a control signal for a predetermined time to cause the emergency valve to partially stoke.

Abstract: The present invention provides a method of monitoring a cyclic system comprising a plurality of cyclic means, comprising measuring a single parameter for the complete cyclic system, and, during a learning mode, cycling the cyclic system a plural number of times, and from the measured value of the parameter, providing a range of acceptable values, and during a subsequent monitoring mode comparing the measured value of said parameter with said range of values, and providing an output signal if the measured value of the parameter is outside said range of values.