Valve positioning handle
AssigneeRockwell International Corporation
InventorsEarl A. Bake, E. Frederick Schoeneweis
Life of this patent
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Abstract
A valve positioning handle is for a plastic valve which is capable of being utilized in gas distribution pipes and includes a body and a fluid isolation member rotatably disposed therein. If the valve becomes jammed, it and/or the pipe are capable of being destroyed by the application of excessive forces to the isolating member and the body during rotation. The valve positioning handle includes an extended fitting centrally aligned with the isolation member and has a number of working surfaces thereon for the receipt of different torque applying tools. A connecting section between the extended fitting and the isolation member is designed to fail prior to the generation of any excessive forces which might destroy the valve or pipe by a tool being utilized to rotate the fitting.
Claims13
A valve positioning handle for a plastic valve which is capable of being utilized in a pressurized fluid distribution pipe, has a central axis and includes a body and a fluid isolation means disposed therein for rotation about said axis;
- at least one of said valve and said distribution pipe being capable of being destroyed or damaged by the application of excessive forces to said isolation means and said body during rotation;
- said valve positioning handle comprising:
- an extended fitting centrally aligned with said axis and having working surfaces thereon for receipt of at least one type of torque applying tools;
- and
- a connecting section between said extended fitting and an end of said isolation means being formed of a pre-selected material and having predetermined cross-sectional dimensions relative to said axis in a plane perpendicular to said axis to ensure its failure prior to generation of said excessive forces by said torque applying tool being utilized to rotate said extended fitting.
A valve positioning handle for a valve which valve includes a body member and a rotatable isolation member and is connectable to a distribution pipe member, at least one of said members being formed of plastic having a predetermined ultimate shear stress, said isolation member being disposed within said body member and rotatable about an axis to control the flow of fluid through said pipe member, said one of said members being capable of being destroyed or damaged if said ultimate shear stress is exceeded by the application of excessive forces thereto during rotation of said isolation member, said valve positioning handle comprising:
- an extended fitting having working surfaces thereon for receipt of at least one type of torque applying tool for rotating said isolation member;
- and a connecting section extending axially between said extended fitting and said isolation member, being formed of a pre-selected material and having predetermined crosssectional dimensions as measured in a plane which is perpendicular to said axis to insure failure by torsional shear generally along said plane prior to generation of said excessive forces to said one of said members by said torque applying tool.
Dependencies are inferred from the claim text.