F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/4
F16K 43/00 (2006.01) F16K 31/122 (2006.01) F16K 37/00 (2006.01)
Patent
CA 1294599
Abstract of the Disclosure. A surface safety valve hydraulic actuator of modular construction. The actuator includes separately install- able, removable, and interchangeable wirecutting and non-wirecutting spring modules, used with the same hydraulic cylinder and bonnet. The bonnet is attached to the body of the valve. A lower stem extends through a lower seal and into the valve body cavity, and is con- nected to the gate segments of the valve. A hydraulic cylinder is removably attached to the bonnet. An upper stem with a central bore is disposed in the cylinder chamber and carries a piston thereon, and extends through an upper seal in the top of the hydraulic cylinder. A spring module is removably attached to the hydraulic cylinder, and includes a spring can telescoped over the top of the cylinder. The spring can is rotatably con- nected to an annular spring retainer, which in turn is mounted on the cylinder. A coupling rod is inserted through the upper stem and screwed into the top of the lower stem. A spring coupler is connected to the upper end of the coupling rod, and bears upon the upper surface of a spring plate. In the non-wirecutting spring module, a single coil spring is disposed in the spring can between the spring plate and the spring retainer. In the wirecutting spring module, dual coil springs are used.
559450
Cooper Cameron Corporation
Smart & Biggar
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