Valves and valve actuation – Electrically actuated valve – Rotary electric actuator
Patent
1992-10-26
1995-01-03
Walton, George L.
Valves and valve actuation
Electrically actuated valve
Rotary electric actuator
74 8915, 251268, 318469, F16K 3104, F16K 3150
Patent
active
053779525
ABSTRACT:
A valve, particularly for shutting off a flow, includes a housing. A rotationally fixed threaded part is rotationally fixed and axially displaceable in the housing. A rotatable threaded part is axially resiliently and rotatably supported in the housing. A brake device has at least two friction surfaces facing one another. One of the friction surfaces is rotationally fixed in the housing, and the other of the friction surfaces is rotationally fixedly joined to the rotatable threaded part. The friction surfaces are pressed against one another by an axial displacement for braking a rotary motion of the rotatable threaded part and forming a braking surface, if a predetermined command force upon the rotationally fixed threaded part is exceeded. At least one of the friction surfaces has a predetermined free angle for rotational fixation. According to one embodiment of the invention, at least one brake ring is axially displaceably disposed on the rotatable threaded part, and the other of the friction surfaces is located on the at least one brake ring. According to another embodiment of the invention, a brake sleeve being axially displaceable in the housing has an end surface, and the one friction surface is disposed on the end surface of the brake sleeve.
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Laurer Erwin
Schabert Hans-Peter
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
Walton George L.
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