Fluid handling – Processes
Patent
1988-06-29
1989-07-04
Rosenthal, Arnold
Fluid handling
Processes
25112904, 25112912, F16K 3104
Patent
active
048441104
ABSTRACT:
A control system for controlling the operation of a motor operated valve including a limit switch to stop the opening of the valve element of the valve at an open position which is short of its backseated position, a selector switch to override the limit switch ot permit the valve element to be moved past the open position toward the backseated position, and a digital protective relay to repeatedly measure current flow through the valve motor, to compare current readings with setpoint values and to rapidly discontinue motor current flow when current readings exceed setpoint values.
REFERENCES:
patent: 3972506 (1976-08-01), Azuma
patent: 4097786 (1978-06-01), Lund
patent: 4099704 (1978-07-01), Okumura
patent: 4345292 (1982-08-01), Jaeschke et al.
patent: 4455012 (1984-06-01), Gupta
patent: 4584902 (1986-04-01), Fry
NRC, Office of Insp. and Enforcement IE Bulletin No. 85-03 Entitled "Motor-Operated Valve Common Mode Failures During Plant Transients Due to Improper Switch Settings" Dated 11-15-85.
NRC Information Notice No. 87-40 Entitled "Backseating Valves Routinely to Prevent Packing Leakage" Dated 8-31-87.
Publication Entitled "Application of Diagnostics to Determine Motor-Operated Valve Operational Readiness" by D. M. Eissenberg, Oak Ridge National Laboratory, Oak Ridge, Tenn.
Rosenthal Arnold
The Phasor Corporation
LandOfFree
Control system for remotely controlled motor operated valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control system for remotely controlled motor operated valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control system for remotely controlled motor operated valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-845403