Electrically driven actuator with failsafe feature

Details Electrically driven actuator with failsafe feature Electrically driven actuator with failsafe feature

1996-10-15

1999-11-16

Rivell, John

Valves and valve actuation

Biased trip

Electrical trip actuation

251 69, 25112912, 744248VA, F16K 3150

Patent

active

059842601

ABSTRACT:
A valve actuator preferably driven by an electric motor is disclosed. The valve actuator is useful with surface safety valves and uses power input from an electric motor to position the valve in its normal position. A mechanism is provided to allow the valve to shift positions to a failsafe position upon failure of electrical power to the motor connected to the actuator. A screw drive is provided with the motor, with a latch mechanism holding a nut against rotation. The nut can advance longitudinally upon rotation of the drive to move a valve stem. Upon failure of electrical power, the latch mechanism releases the nut from a coupling in the actuator which is connected to the valve stem, and the main return springs in the actuator allow the nut to rotate with respect to the screw drive so that the valve can assume its failed position. Normal applications allow the valve to fail closed; however, the valve can be configured so that failure results in opening of the valve if the application requires it.

REFERENCES:
patent: 1466945 (1923-09-01), Bendix
patent: 1784094 (1930-12-01), Fletcher
patent: 2327980 (1943-08-01), Bryant
patent: 2930571 (1960-03-01), Vogl
patent: 3168841 (1965-02-01), Caldwell et al.
patent: 3512421 (1970-05-01), Anderson
patent: 3518891 (1970-07-01), Denkowski
patent: 3640140 (1972-02-01), Gulick et al.
patent: 3889924 (1975-06-01), Karpenko
patent: 3921264 (1975-11-01), Madonian et al.
patent: 4082247 (1978-04-01), Dalton
patent: 4090589 (1978-05-01), Fitzwater
patent: 4130030 (1978-12-01), Stratienko
patent: 4189950 (1980-02-01), Killian
patent: 4256065 (1981-03-01), Hirt
patent: 4273307 (1981-06-01), Malinski et al.
patent: 4289038 (1981-09-01), Hore
patent: 4323221 (1982-04-01), Krober et al.
patent: 4436278 (1984-03-01), Smith
patent: 4651969 (1987-03-01), Dowdall
patent: 4741508 (1988-05-01), Fukamachi
patent: 4749004 (1988-06-01), Peash
patent: 4771643 (1988-09-01), Mott
patent: 4920811 (1990-05-01), Hopper
patent: 4920816 (1990-05-01), Inabe et al.
patent: 5195721 (1993-03-01), Akkerman
patent: 5497672 (1996-03-01), Appleford et al.
Baker Oil Tools, Maintenance and Operating Instructions for Model "CSWC" Coil Spring, High Thrust Wire-Cutting Actuator, Product Family 884-64, Nov. 5, 1993, 1-12.
Otis Engineering Corporation, Guide to Otis Surface Safety Valve Actuators and Accessories, Feb. 1993, 5.
Axelson AVA, information of various hydraulic actuators, 3 pages, date unknown.
Baker Oil Tools, information on various pneumatic and hydraulic actuators, 5 pages, date unknown.
Model "SRM" Saftey Release Manual Actuator; 4 88. (Dresser); Date Unknown.

Affiliated with

Also associated with

Rating

Electrically driven actuator with failsafe feature does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electrically driven actuator with failsafe feature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrically driven actuator with failsafe feature will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1313398