Frangible valve stem assembly for rotary valve
AssigneeDresser Industries, Inc.
InventorStanley C. Kisiel
Life of this patent
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Abstract
The operating stem of a rotary valve is rotationally displaced via a detachable valve cap mounted on the stem and to which rotational operating torque is applied. Depending internally from the cap into a rotational interfit with slots provided on a stem lug are a pair of frangible shear pins adapted to shear off and prevent valve damage in response to excessive rotational torque exerted against the cap.
Claims5
In a rotary valve including a body defining a fluid passage between an inlet and an outlet, a closure member within said passage and operably rotatable via a stem extending exterior of said body between a first position opening said passage to fluid flow and a second position closing said passage to fluid flow, the improvement comprising said stem having means defining spaced apart slotted apertures along opposite sides and cap means adapted to cooperate with said stem in a rotational interlock for transmitting rotational torque applied to said cap to said stem for operating said closure member between said first and second positions, said cap means containing frangible means comprising shear pins extending from a surface of said cap into an interfitting relation within said stem slots for effecting said interlock and operative to prevent excess rotational torque applied to said cap from being transmitted to said stem.
Dependencies are inferred from the claim text.