Filter changing valve unit

Details Filter changing valve unit Filter changing valve unit

1974-05-23

1976-02-24

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

With upstream screen or perforated plate for straining,...

Plural screens or plates

210341, 210420, B29B 104

Patent

active

039402223

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.

REFERENCES:
patent: 1270722 (1918-06-01), Gillette
patent: 1345364 (1920-07-01), Hausen
patent: 1515080 (1924-11-01), Strachan et al.
patent: 1961083 (1934-05-01), Sherman et al.
patent: 3243849 (1966-04-01), Joukainen
patent: 3455357 (1969-07-01), Zink
patent: 3503096 (1970-03-01), Marianelli
patent: 3618781 (1971-11-01), Brown
patent: 3679060 (1972-07-01), Smith
patent: 3833121 (1974-09-01), Singleton et al.
patent: 3896029 (1975-07-01), Bereselinck

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