Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1993-06-03
1995-03-07
Karlsen, Ernest F.
Electricity: measuring and testing
Plural, automatically sequential tests
73168, 324772, 36455101, G01R 3100, G01M 1900
Patent
active
053961676
ABSTRACT:
A method is disclosed for determining operability of a motor operated valve combination including a valve having a valve stem, a valve disc, a valve seat, and a motor operator having a motor drive interconnecting the motor to the valve stem for movement of the valve disc toward and into engagement with the valve seat to close the valve and a control switch for deactivating the motor. The method comprises the steps of sensing the real motor power of the motor as a function of time during valve closing with zero differential pressure applied to the valve at a first time. From the sensed information, the rate of motor power build-up is determined after the onset of valve wedging during valve closing at the first time. The real motor power of the motor is again sensed as a function of time during valve closing with zero differential pressure applied to the valve at a second time which is subsequent to the first time. The rate of motor power build-up after the onset of valve wedging during valve closing at the second time is determined from the sensed information. The rate of motor power build-up after the onset of valve wedging at the first and second times is compared as an indication of lubrication change within the valve between the first and second times.
REFERENCES:
patent: 4690003 (1987-09-01), McNennamy et al.
patent: 5000040 (1991-03-01), Charbonneau et al.
patent: 5029597 (1991-07-01), Leon
Karlsen Ernest F.
Liberty Technologies, Inc.
LandOfFree
Method for remotely determining operability of motor operated va does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for remotely determining operability of motor operated va, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for remotely determining operability of motor operated va will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1408691