Liveload assembly for valve
AssigneeControl Components, Inc.
InventorCurtis George Sterud
Life of this patent
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Abstract
A valve (100) has a valve stem (150) sealed by packing (160). A gland spigot (180) applies an axial compression loading to the packing (160) via a sleeve (130) when bolts (240, 250) are tightened. The spigot (18) has arms (190, 200) with slots (400, 401) that divide the arms (190, 200) into upper and lower branches (402, 403). The branches (402, 403) arc urged towards each other on tightening the bolts (240, 250) to pre-load the packing and act as integral springs to maintain the compression loading in use of the valve (100). The deflection of the branches (402, 403) is limited by one or more washers (251, 252) located on the bolts (240, 250) between the branches (402, 403) to control the loading applied to the packing (160).
Claims19
A valve having a body defining a passage, a valve stem movable in the passage to open and close the valve, a packing surrounding a portion of the length of the valve stem, a sleeve bearing axially at one of its ends onto the packing to compress it, the sleeve carrying at its other end a spigot or flange extending radially outwardly and bolts passing through and secured to the spigot or flange adjacent one of the bolt ends, the other end of each bolt being secured to a clamp which is clamped to the valve body, the bolts and the spigot or flange providing an integral spring construction.
A valve according to any preceding claim, in which the spigot or flange is formed of a heat-treated alloy steel or a precipitation hardened stainless steel.
A valve according to any preceding claim, in which the packing is in the form of a multiplicity of rings of the packing material.
A valve according to any preceding claim, in which the packing includes a lantern ring through which any leakage of fluid from the valve may be conducted to a safe area.
A kit of parts for a valve of the type having a body defining a passage, a valve stem movable in the passage to open and close the valve, a packing surrounding a portion of the length of the valve stem and a sleeve bearing axially on the packing to compress it, the kit comprising a spigot or flange to bear against the sleeve, the spigot or flange comprising at least two arms, each arm having a radially extending slot dividing the arm into two spaced branches, each arm being bored to receive a bolt whereby the spigot or flange may be clamped to the valve, and a washer to fit over the bolt between the branches, the washer being of thickness to reduce the distance between the branches to permit a maximum predetermined deflection therebetween.
A kit of parts for a valve of the type having a body defining a passage, a valve stem moveable in the passage to open and close the valve, a packing surrounding a portion of the length of the valve stem and a sleeve bearing axially on the packing to compress it, the kit comprising a spigot or flange to bear against the sleeve, the spigot or flange comprising at least two arms, each arm being bored to receive a bolt whereby the spigot or flange may be clamped to the valve, each bolt having an integral spring portion whereby the bolt can be stretched to control loading of the packing, and means to limit extension of the bolt to permit a maximum predetermined loading to be applied to the packing.
Dependencies are inferred from the claim text.