a controllable valve device which latches when it is turned on, that means it remains in the on state when the trigger signal has ended
NOTE 1 – Most latching valve devices can be turned off only by suppressing the current through the conducting path by external means.
NOTE 2 – A gate turn-off (GTO) thyristor is a latching valve device which can be turned off by a control signal.
NOTE 3 – A latching valve device may be reverse blocking or non-reverse blocking.
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