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US 3,948,284 AGranted
Rising-plug plug valve
AssigneeThe Dow Chemical Company
InventorCharles Joseph Walworth
Life of this patent
Estimating the term…
Abstract
In a rising-plug plug valve wherein the plug and valve body at the narrow end of the plug define a cavity, a passage is provided between the cavity and the outlet opening of the plug valve. On opening, the valve plug and seat portion adjacent the narrowest portion of the plug is flushed by liquid passing therebetween and the outlet opening of the passageway.
Claims5
In an improved rising-plug plug valve comprising
- a valve body, the valve body defining
- an inlet opening,
- an outlet opening and
- a passage therein, the passage providing full communication between the inlet opening and the outlet opening, the valve body defining
- a plug receiving cavity having a generally frustoconical configuration, the plug receiving cavity intersecting the passageway between the inlet and the outlet,
- a plug disposed within the plug receiving cavity, the plug having a general frustoconical configuration and mating with at least a portion of the walls of the plug receiving cavity, the plug defining
- a fluid passageway which on rotation of the plug permits selective communication between the inlet and the outlet end, the plug having
- an end of major diameter and
- an end of minor diameter, the plug and valve body at the plug end of minor diameter defining
- a closed cavity,
- a means to selectively position the plug in the sealing engagement with the walls defining the plug receiving cavity and means to rotate the plug,
- the improvement which comprises providing a groove in a surface extending between the cavity defined by the plug and the body and the outlet passageway to thereby provide fluid communication between the cavity defined by the plug and the body and the outlet passageway.
9 more elements
In an improved plastic lined rising-plug plug valve comprising
- a valve body having a lining of a plastic
- material, the valve body defining
- an inlet opening,
- an outlet opening and
- a passage therein, the passage providing full communication between the inlet opening and the outlet opening, the valve body defining
- a plug receiving cavity having a generally frustoconical configuration, the plug receiving cavity intersecting the passageway between the inlet and the outlet,
- a plug having a lining and coating of a plastic material, the plug being disposed within the plug receiving cavity, the plug having a general frustoconical configuration and mating with at least a portion of the walls of the plug receiving cavity, the plug defining
- a fluid passageway which on rotation of the plug permits selective communication between the inlet and the outlet end, the plug having
- an end of major diameter and
- an end of minor diameter, the plug and valve body at the plug end of minor diameter defining
- a closed cavity,
- a means to selectively position the plug in the sealing engagement with the walls defining the plug receiving cavity and means to rotate the plug,,
- the improvement which comprises providing a groove in the plastic material between the cavity defined by the plug and the body and the outlet passageway thereby providing fluid communication between the cavity defined by the plug and the body and the outlet passageway.
10 more elements
In an improved rising-plug plug valve comprising
- a valve body, the valve body defining
- an inlet opening,
- an outlet opening and
- a passage therein, the passage providing full communication between the inlet opening and the outlet opening, the valve body defining
- a plug receiving cavity having a generally frustoconical configuration, the plug receiving cavity intersecting the passageway between the inlet and the outlet,
- a plug disposed within the plug receiving cavity, the plug having a general frustoconical configuration and mating with at least a portion of the walls of the plug receiving cavity, the plug defining
- a fluid passageway which on rotation of the plug permits selective communication between the inlet and the outlet end, the plug having
- an end of major diameter and
- an end of minor diameter, the plug and valve body at the plug end of minor diameter defining
- a closed cavity
- a means to selectively position the plug in the sealing engagement with the walls defining the plug receiving cavity and means to rotate the plug,
- the improvement which comprises a passageway between the cavity defined by the plug and the body and the outlet passageway, thereby providing fluid communication between the cavity defined by the plug and the body and the outlet passageway wherein the passageway is defined by mating grooves of the valve body and plug.
9 more elements
Dependencies are inferred from the claim text.