OP AFSTAND BESTUURBARE BEDIENINGSINRICHTING, DIE IN ONBELASTE TOESTAND NAAR HAAR UITGANGSSTAND TERUGKEERT.

摘要

An actuator for a valve in which valve opening and closing is effected via a rectilinearly movable member having, at one end, a driving device and, at its other end, a return-movement arrangement. To-and fro movement of the member under the control of the driving device and return-movement arrangement opens or closes the valve, or vice versa.