Valves and valve actuation – With means for blocking or disabling actuator – Released by non-valving actuator motion
Patent
1992-04-01
1994-03-15
Chambers, A. Michael
Valves and valve actuation
With means for blocking or disabling actuator
Released by non-valving actuator motion
251105, 251107, 251173, 251306, F16K 3500
Patent
active
052940918
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a stop cock for a liquid container, comprising a substantially annular valve housing provided on either side of its longitudinal center line with bosses in which passages have been arranged for rotatably supporting a substantially circular valve perpendicularly to the longitudinal center line of the valve housing, a handle mounted on an operational shaft applied outside the valve housing for rotating the valve between a closed position and an open position which is perpendicular thereto, and a seat mounted in the valve housing and cooperating with the valve in the closed position of the stop cock.
2. Description of the Background
Known stop cocks of this type, e.g. when they are applied on tank lorries, are mounted between two flange pieces and this results in an extra heavy weight and a long construction length that is not always available or desired. If the seat of known stop cocks has worn out, it usually takes a lot of energy and time to dismount the wom out seat and almost always it will have to be replaced by an entirely new part. Many of the known stop cocks also have the disadvantage that in order to open the stop cock a lot of strength has to be exerted or that a long handle has to be used, respectively, and often they also tend to close of their own accord or to start "rattling".
SUMMARY OF THE INVENTION
The invention aims to improve the foregoing and furthermore to achieve some other advantages over the known stop cocks. According to the invention, this has been achieved in that the handle comprises a recess for rotatably receiving a stop bush that comprises a cam that for the determination of the closed position can cooperate with an indentation of a top plate that is arranged on the boss situated on the operational side, and that comprises a circular passage for the operational shaft, said stop bush having an unround passage for a correspondingly formed driving shaft of an unlocking lever, and in that at least the handle and the top plate can be mounted in a plurality of positions.
The cam of the stop bush is preferably brassed by a spiral spring towards the periphery of the top plate, so one does not have to rely on the influence of gravity to have the cam of the stop bush end up in the recess in the closed position of the stop cock. For that matter, gravity could only do the job properly if the handle were mounted "on top".
The top plate that can be mounted in a plurality of positions may also comprise a cam along its periphery for restricting the open position, from which the stop cock can be rapidly closed in case of danger, and a cam for restricting a position in which the rear side of the valve can be cleaned.
The driving shaft of the unlocking lever can be inserted into the unround passage of the stop bush from either side.
The handle and the top plate may each comprise a security hole through which a padlock or seal can be inserted in the closed position of the stop cock. This is to comply with the often prevailing regulation that there has to be a double safeguard: in order to open a properly safeguarded stop cock, one requires both an unlocking lever and the key to the lock.
If the top plate is mounted by means of four bolts arranged in a rectangle onto four flange lugs of the boss situated on the operational side, then the top plate can be mounted in four different positions (rotated over 180, and upside down) and there would also be enough space for placing a padlock or seal.
If the central area of the edge of the valve that engages the seat extends spherically along a radius which is slightly bigger with respect to the rotational center line of the valve than the tangent circle on an unbiased seat about the same rotational center line, and if the valve is moreover rotably supported by a short shaft and a operational shaft in the extension thereof, so that the valve in the closed position may show a cavity directed towards the liquid container, and if the seat is furthermore received in a seat groove
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Chambers A. Michael
Keystone International Holdings Corp.
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