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US 11,428,344 B2Granted
Valve
AssigneeKitz Corporation
InventorsTaisuke Muto, Tetsuya Kobayashi
Life of this patent
Estimating the term…
Abstract
A valve in which a backseat structure is formed at a height to easily prevent penetration of fluid with high accuracy from outside a bonnet to inhibit an increase in internal pressure. In a state in which a packing for sealing (5) is attached inside a bonnet (10) in a longneck structure, a stem (3) is axially inserted and a flow path (13) inside a valve box (2) is provided to be opened and closed by a valve body (4). The bonnet is divided into an upper bonnet (11) and a lower bonnet (12) at a position higher than a position at which a fluid flowing inside the valve box ascends in a liquid state. A backseat mechanism (42) has a fixed-side seal surface (21) formed on a lower end side of the upper bonnet and a movable-side seal surface (41) on an outer peripheral surface of the stem.
Claims9
A low-temperature valve comprising:
- a bonnet having a longneck structure;
- a valve box connected to the bonnet, a flow path being provided inside the valve box;
- a stem axially inserted into the bonnet so as to be freely ascendable and descendable, the stem having a valve body provided at a lower end of the stem;
- and
- a packing attached inside the bonnet for sealing around the stem,
- wherein the flow path is configured so as to be freely opened and closed by the valve body,
- wherein the bonnet is a divided bonnet comprising an upper bonnet and a lower bonnet integrally fixed to each other, a division position between the upper bonnet and the lower bonnet being set at a predetermined distance from the flow path of the valve box, the predetermined distance being longer than a distance a fluid flowing in the valve box can flow in a liquid state before changing to a gaseous state,
- wherein the low-temperature valve includes a backseat mechanism having a fixed-side seal surface formed at a lower end side of the upper bonnet and a movable-side seal surface formed on an outer peripheral surface of the stem, the backseat mechanism forming abutting sealing by the movable-side seal surface and the fixed-side seal surface abutting on and sealing each other when the valve body is in an open position,
- wherein the upper bonnet and the lower bonnet are welded together at a welded portion in a state in which an insertion part formed on a lower part of the upper bonnet fits in a diameter-enlarged recessed groove formed on an inner periphery of an upper part of the lower bonnet, and a space is provided between a lower end face of the insertion part and a bottom surface of the diameter-enlarged recessed groove,
- wherein a depth to which the insertion part extends into the diameter-enlarged recessed groove is set so that the welded portion is distanced from the fixed-side seal surface of the upper bonnet such that the fixed-side seal surface is not thermally deformed by formation of the welded portion, and
- wherein a diameter-reduced step portion is formed on an upper side of an outer circumference of the insertion portion, a step portion is formed on an upper side of an inner circumference of the diameter-enlarged recessed groove, and the upper bonnet and the lower bonnet are welded together with the diameter-reduced step portion being engaged with the step portion.
8 more elements
A low-temperature valve comprising:
- a bonnet having a longneck structure;
- a valve box connected to the bonnet, a flow path being provided inside the valve box;
- a stem axially inserted into the bonnet so as to be freely ascendable and descendable, the stem having a valve body provided at a lower end of the stem;
- and
- a packing attached inside the bonnet for sealing around the stem,
- wherein the flow path is configured so as to be freely opened and closed by the valve body,
- wherein the bonnet is a divided bonnet comprising an upper bonnet and a lower bonnet integrally fixed to each other, a division position between the upper bonnet and the lower bonnet being set at a predetermined distance from the flow path of the valve box, the predetermined distance being longer than a distance a fluid flowing in the valve box can flow in a liquid state before changing to a gaseous state,
- wherein the low-temperature valve includes a backseat mechanism having a fixed-side seal surface formed on the upper bonnet and a movable-side seal surface formed on an outer peripheral surface of the stem, the backseat mechanism forming abutting sealing by the movable-side seal surface and the fixed-side seal surface abutting on and sealing each other when the valve body is in an open position,
- wherein the upper bonnet and the lower bonnet are welded together at a welded portion in a state in which an insertion part formed on a lower part of the upper bonnet fits in a diameter-enlarged recessed groove formed on an inner periphery of an upper part of the lower bonnet, and a space is provided between a lower end face of the insertion part and a bottom surface of the diameter-enlarged recessed groove,
- wherein a depth to which the insertion part extends into the diameter-enlarged recessed groove is set so that the welded portion is distanced from the fixed-side seal surface of the upper bonnet such that the fixed-side seal surface is not thermally deformed by formation of the welded portion, and
- wherein a diameter-reduced step portion is formed on an upper side of an outer circumference of the insertion portion, a step portion is formed on an upper side of an inner circumference of the diameter-enlarged recessed groove, and the upper bonnet and the lower bonnet are welded together with the diameter-reduced step portion being engaged with the step portion.
8 more elements
Dependencies are inferred from the claim text.