Patent ID: 9695948
Date: 2017-07-04
CPC Classifications: F16K

Claim:
1. A vacuum valve comprising: a valve housing which includes a valve seat, a closure member which, in a closed position, is pressed against the valve seat with the vacuum valve in a closed state, and in an open position is raised from the valve seat with the vacuum valve in an open state, and a manual actuator by which the closure member is displaceable in a linear manner in a closing direction from the open position into the closed position and in a direction opposite the closing direction from the closed position into the open position, the manual actuator comprises a screw transmission, and a rotational element for actuating the screw transmission, the screw transmission comprising a first driving part which is connected to the rotational element and a second driving part which is connected to the closure member, the first and second driving parts, one of the first and second driving parts comprises an external thread and an other of the first and second driving parts comprising an internal thread, wherein the first and second driving parts are in threaded engagement and as a result of rotating the rotational element in a closing direction of rotation the closure member, which is situated in the open position, is displaceable in the closing direction and as a result of rotating the rotational element in an opening direction of rotation, which is opposite to the closing direction of rotation, the closure member, which is situated in the closed position, is displaceable in a direction opposite the closing direction, the vacuum valve further comprising a closing spring, which acts upon the closure member in the closing direction with the closure member in the closed position, the closing spring acts between the valve housing and the closure member and impinges upon the closure member in the closing direction even with the closure member in the open position, and the first driving part is displaceable relative to the valve housing parallel to the closing direction, wherein, with the closure member in the open position, the closure member is held against displacement in the closing direction by a supporting stop against which a stop face of the rotational element or of the first driving part abuts, wherein with the closure member in the closed position, rotation of the rotational element in the closing direction of rotation is limited by a limiting stop, wherein when the rotation of the rotational element effected in the closing direction of rotation is limited by the limiting stop, the rotational element or the first driving part abuts against the limiting stop, and wherein the limiting stop is formed by at least one projection which is arranged on a spring arm, so that the limiting stop can be overrun in a non-destructive manner by the rotational part or the first driving part abutting against it when a limit value of torque acting on the rotational element in the closing direction is exceeded.