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US3685706A Expired / Lapsed US ⏱️ 0.0 years remaining

Rotary valve for metallurgical vessels and the like

Assignee: Didier Werke AG
•
Filing: 1970-02-20
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Granted: 1972-08-22
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Expires: 1990-02-20
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Abstract

Abstract A rotary-valve mechanism is provided for controlling the discharge of molten material from a container (primarily molten metal such as steel from casting ladles etc.) which mechanism is fitted at the base of the container and comprises a stationary refractory upper plate and a rotatable refractory lower plate below it, with the upper surface of the lower plate in contact with the under surface of the upper plate, the two plates being pierced with flow passages which can be brought into and out of register by rotation of the lower plate. The contact surfaces of the two plates are flat and lie in a plane normal to the axis of rotation, the lower plate is provided with an axial discharge orifice to which the flow passages lead, and the flow passages are so formed that the flow through them, in the fully open and in at least one partially position, is substantially symmetrical with regard to the axis of rotation; this latter requirement is met by the provision of diametrically opposed flow passages in the upper plate lead by way of opposed recesses in the upper surface of the lower plate to the discharge orifice. The two plates are replaceable from below the ladle.

Inventors

  • 👤 Hans Reinhard Fehling

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 20:11
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10; B; B22; B22D; B22D41/00; B22D41/14; B22D41/22; B22D41/26

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 146 words
In combination, a container for molten material having a stationary refractory ring and a valve closure assembly for controlling the discharge of molten material from the container, comprising a stationary refractory upper member and a rotatable refractory lower member having an upper surface in contact with an under surface of said upper member, said members are each pierced with at least two flow passages which can be brought into and out of register by rotation of said lower member, characterized in that (a) said surfaces are flat and lie in a plane which is normal to the axis of rotation of said members, (b) said lower member is provided with an axial discharge orifice, and (c) said flow passages are so constructed that the flow therethrough, in the fully opened and in a partially opened position is substantially symmetrical with regard to said axis of rotation.
Claim 2
Dependent Claim 146 words
In combination, a container for molten material having a stationary refractory ring and a valve closure assembly for controlling the discharge of molten material from the container, comprising a stationary refractory upper member and a rotatable refractory lower member having an upper surface in contact with an under surface of said upper member, said members are each pierced with at least two flow passages which can be brought into and out of register by rotation of said lower member, characterized in that (a) said surfaces are flat and lie in a plane which is normal to the axis of rotation of said members, (b) said lower member is provided with an axial discharge orifice, and (c) said flow passages are so constructed that the flow therethrough, in the fully opened and in a partially opened position is substantially symmetrical with regard to said axis of rotation.
Claim 3
Dependent Claim 60 words
A combination according to claim 1, wherein the upper member has a plurality of symmetrically disposed flow passages and the lower member has a corresponding plurality of recesses, in its upper surface, leading to the axial discharge orifice for movement, by rotational movement of the lower member, into and out of register with the flow passages in the upper member.
Claim 4
Dependent Claim 16 words
A combination according to claim 2, wherein the flow passages are placed at diametrically opposed locations.
Claim 5
Dependent Claim 33 words
A combination according to claim 2, wherein the flow passages in the upper member are symmetrically disposed and shaped and their radial width increases in one direction of rotation of the lower member.
Claim 6
Dependent Claim 32 words
A combinAtion according to claim 2, wherein the upper member has a plurality of circumferentially spaced flow passages which progressively increase in size in one direction of rotation of the lower member.
Claim 7
Dependent Claim 31 words
A combination according to claim 1, having a rotary base on which the lower member is mounted, and bearing means for rotatably supporting said base from the underside of the container.
Claim 8
Dependent Claim 18 words
A combination according to claim 1, wherein the upper and lower members are replaceable from below the container.

References Cited (Backward Citations)

US873497A Cited
US1006450A Cited
US2055076A Cited
US3374930A Cited
US3386633A Cited
US3459346A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-08-22 1976-02-21 1976-08-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-22 1980-02-21 1980-08-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-22 1984-02-21 1984-08-22 $7700.00 Window Closed / Lapsed

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