H - Electricity
02
K
251/18
H02K 7/06 (2006.01) F16K 31/04 (2006.01)
Patent
CA 1229079
ABSTRACT A remotely controlled valve having an armature which is operated between its open and closed positions by means of a control drive. The valve has a closure element which is displaceable by means of an axially movable spindle in a valve housing. The spindle is axially driven by an adjustment drive through a spindle sleeve rotatably supported in the valve housing and having the spindle threadedly engaged therewith. A transition bushing is rotatably secured to the spindle sleeve, a stroke-limiting member is secured to the spindle, and an intermediate cover and spring means are provided between the transition bushing and the spindle sleeve. The transition bushing and the intermediate cover are slidable in the longitudinal direction of the spindle. In the event of a malfunction of the drive control causing over-driving, the stroke-limiting member is forced against the transition bushing. This causes the transition bushing and the intermediate cover to be displaced axially and the spring means are placed under load. As a result, the rotating transition bushing rubs against the stroke-limiting member and the intermediate cover. The frictional moments thus generated, together with the force of the springs, absorb the energy that has been introduced and the adjustment drive is braked gradually and gently. The extent of the braking moment is selected on the basis of a suitable spring selection. Thus, the maximum forces generated by inadvertent over-driving of the armature and drive assembly are reduced to a controllable level and valve failure is thereby avoided.
452300
Gladisch Manfred
Winklmann Erwin
Borden Ladner Gervais Llp
Deutsche Babcock Werke Aktiengesellschaft
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