F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/84
F15B 15/14 (2006.01) F16K 31/122 (2006.01) F16K 47/00 (2006.01)
Patent
CA 1104467
-A1- FORCE LIMITING DEVICE FOR AN ACTUATOR ROD Abstract of the Disclosure A force limiting device for an actuator rod is used on a valve actuator of the type which includes hydraulic fluid being selectively applied to and discharged from a cylinder at a first side of a piston connected to the actuator rod as high pressure gas of an accumulator mounted on the cylinder acts in opposition thereto on a second side of the piston. The piston includes an interior cylindrical bore narrowing to an opening at the first side thereof which receives the actuator rod slidably therein. The actuator rod extends from the first side of the piston through a hole in the first end of the cylinder for coupling to a valve stem outwardly of the cylin- der. An enlarged piston head is secured at a first side there- of to the other end of the rod and disposed within the interior cylindrical bore for sliding, sealed contact with an interior of the bore. Atmospheric pressure communicates with the bore to act on the second side of the piston head. The hydraulic fluid produces a pressure on the first side of the piston head which is opposed by atmospheric pressure at the second side to produce a maximum tensile force on the actuator rod when the piston is held against the piston stop at a second end of the cylinder by the hydraulic fluid which produces a force on the piston greater than the maximum tensile force on the actuator rod.
324446
Clapper Robert L.
Hankosky Andrew
Kirby Eades Gale Baker
Rockwell International Corporation
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