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US 3,940,222 AGranted
Filter changing valve unit
AssigneeJ. Zink Co., Inc.
InventorJulius Zink
Life of this patent
Estimating the term…
Abstract
In combination with extrusion apparatus having a liquid source, a die and alternate filter means, a continuous flow plug valve unit is provided for use in changing filters; the valve unit comprises a valve housing, plug means seated in the housing, and control means for moving the plug means with respect to the housing. Passage means in the plug means and housing overlap in all operative positions of the valve to provide an available flow passage of hydraulic flow radius everywhere at least about equal to that of the inlet from the source; the valve presents no restriction to the flow of liquid from the source.
Claims10
In combination with extrusion apparatus having a liquid source, a die and alternate filter means, a plug valve unit comprising
- a valve housing having
- a first filter outlet passage to the first filter means and first return passage from the first filter means
- a second filter outlet passage to the second filter means and second return passage from the second filter means
- a source inlet passage from the source
- a die outlet passage to the die
- said valve housing having at least one bore defining internal housing surfaces, said passages having spaced openings in said housing surfaces
- plug means seated in said housing providing
- inlet through passage means for connecting said source inlet passage to a said filter outlet passage and
- outlet through passage means for connecting a said return passage to said die outlet passage
- said plug means comprising at least one plug element rotatably mounted within said housing bore and having external surfaces of revolution cooperating with said internal housing surfaces
- said through passage means at their opposite ends having spaced openings in said plug element surfaces
- each said housing bore having at least three said spaced openings in its said internal housing surface,
- the said through passage means spaced openings of the said plug element mounted in said bore being alternately connectable to selected pairs of said housing passage openings
- and control means for moving said plug means between a first position in which said inlet through passage means connects said source inlet passage with said first filter outlet passage and said outlet through passage means connects said first return passage with said die outlet passage, and a second position in which said inlet through passage means connects said source inlet passage with said second filter outlet passage and said outlet through passage means connects said second return passage with said die outlet passage,
- said source inlet passage cross sectional area increasing from the end proximate to said source toward said plug means, and said die outlet passage cross sectional area decreasing from said plug means toward the end proximate to said die,
- said through passage means having cross sectional area everywhere greater than that of said source inlet passage proximate end and such that in all operative positions of said plug means the overlap of said inlet through passage means with said source inlet passage and the overlap of said outlet through passage means with said die outlet passage provide an available flow passage of hydraulic flow radius everywhere at least about equal to or greater than that of said source inlet passage end proximate to said source.
13 more elements
In combination with extrusion apparatus having a liquid source, a die and alternate filter elements, an interconnected double plug valve comprising
- a valve housing
- an inlet plug element and an outlet plug element seated in said housing, each said plug element having a flow passage therethrough, said inlet plug element having initial flow passage means, and said outlet plug element having vent passage means communicating with the exterior of said valve,
- said valve housing having
- a first filter outlet passage to the first filter element and first return passage therefrom
- a second filter outlet passage to the second filter element and second return passage therefrom
- a source inlet passage from the source to said inlet plug element
- a die outlet passage from said outlet plug element to the die
- said valve housing having two spaced bores defining internal housing surfaces, said passage having spaced openings in said housing surface
- said plug elements being rotatably mounted within said housing bores and having external surfaces of revolution cooperating with said internal housing surfaces
- said plug flow passages at their opposite ends having spaced openings in said plug element surfaces
- each said housing bore having at least three said spaced openings in its internal housing surface,
- the said flow passage spaced openings of the said plug element mounted in said bore being alternately connectable to selected pairs of said housing passage openings
- and control means including connecting means between said plug elements for rotating said plug elements with respect to said housing
- said inlet plug element being rotated between an initial position in which said inlet plug flow passage connects said source inlet passage with said first filter outlet passage and a position in which said inlet plug flow passage connects said source inlet passage with said second filter outlet passage,
- said outlet plug element being rotated between an initial position in which said outlet plug flow passage connects said first return passage with said die outlet passage and a final position in which said outlet plug flow passage connects said second return passage with said die outlet passage
- said control means initially rotating said inlet plug element to a filling position in which said inlet plug initial flow passage means connects said source inlet passage with said second filter outlet passage, without rotating said outlet plug element,
- said outlet plug vent passage means communicating with said second return passage in said filling position of said inlet plug element
- said control means thereafter rotating both plug elements at different rates and completing the rotation of both plug elements simultaneously
- said vent passage means being removed from communication with said second return passage by rotation of said outlet plug element from its said initial position
- whereby flow to the second filter element is begun and the second filter element is filled and deaerated before flow from the first filter element is cut off, and continuous flow from source to die is maintained without inclusion of air in said flow throughout the operation of the valve.
17 more elements
In combination with extrusion apparatus having a liquid source, a die and alternate filter means, a plug valve comprising
- a valve housing
- plug means seated in said housing, and
- control means for moving said plug means with respect to said housing
- said valve housing having
- a first filter outlet passage to the first filter means and first return passage from the first filter means
- a second filter outlet passage to the second filter means and second return passage from the second filter means
- a source inlet passage from the source to said valve plug means
- a die outlet passage from said valve plug means to the die, and first and second cleanout passages communicating with said first and second filter means respectively
- said valve housing having at least one bore defining internal housing surfaces, said passages having spaced openings in said housing surfaces
- said plug means comprising at least one plug element rotatably mounted within said housing bore and having external surfaces of revolution cooperating with said internal housing surfaces
- said plug means having
- through inlet passage means for connecting said source inlet passage to a said filter outlet passage
- through outlet passage means for connecting a said return passage to said die outlet passage, and
- initial flow passage means,
- said through passage means at their opposite ends having spaced openings in said plug element surfaces
- each said housing bore having at least three said spaced openings in its said internal housing surface,
- the said through passage means spaced openings of the said plug element mounted in said bore being alternately connectable to selected pairs of said housing passage openings
- said housing and said plug further providing cooperative vent passage means communicating with the exterior of said valve,
- said control means moving said plug means between an initial position in which said through inlet passage means connects said source inlet passage with said first filter outlet passage and said through outlet passage means connects said first return passage with said die outlet passage, and a final position in which said through inlet passage means connects said source inlet passage with said second filter outlet passage and said through outlet passage means connects said second return passage with said die outlet passage
- said control means initially rotating said plug means to a filling position in which said initial flow passage means connects said source inlet passage with said second return passage and said vent passage means communicates with said second cleanout passage
- said vent passage means being removed from communication with said second cleanout passage by further rotation of said plug element means out of said filling position
- whereby flow to the second filter means is begun and the second filter means is filled and deareated before flow from the first filter means is cut off, and continuous flow from source to die without inclusion of air is maintained throughout the operation of the valve.
19 more elements
Dependencies are inferred from the claim text.