Apparatus for controlling a valve
First Claim
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1. Apparatus for controlling movement of a valve between a number of fixed positions, comprisinga pressure cylinder for activating the valve;
- magnetic valve means for controlling a supply of fluid from a source of pressurized fluid to said pressure cylinder;
a valve having a valve stem;
a linear position indicator which is connected to said valve and provides position indications relating to fixed positions of the valve occurring during movement of the valve stem;
means for storing desired ones of said fixed position indications in a data store; and
control means for comparing current position indications of said linear position indicator with fixed position indications stored in said data store;
wherein said control means has program means for determining, during repeated operation of the valve, the occurrence of changes in the position indications for the fixed positions of the valve and for compensating for such changes which are within a tolerance range around a stored position indication representative of correct operation of the valve.
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Abstract
Known position indicators for magnetic valves are switches which may be activated by cams on the moving parts. Following installation an individual adjustment has to be performed in order to obtain a precise acknowledgment. This disadvantage is avoided and a better monitoring of the functioning of the valve is obtained by detecting the position by means of a continuous position signaler where the data obtained from the putting into service are used as reference data at later determinations of extreme positions.
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Citations
13 Claims
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1. Apparatus for controlling movement of a valve between a number of fixed positions, comprising
a pressure cylinder for activating the valve; -
magnetic valve means for controlling a supply of fluid from a source of pressurized fluid to said pressure cylinder; a valve having a valve stem; a linear position indicator which is connected to said valve and provides position indications relating to fixed positions of the valve occurring during movement of the valve stem; means for storing desired ones of said fixed position indications in a data store; and control means for comparing current position indications of said linear position indicator with fixed position indications stored in said data store; wherein said control means has program means for determining, during repeated operation of the valve, the occurrence of changes in the position indications for the fixed positions of the valve and for compensating for such changes which are within a tolerance range around a stored position indication representative of correct operation of the valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification