Straining and stop valve

Details Straining and stop valve Straining and stop valve

1987-09-04

1989-02-21

Sever, Frank

Liquid purification or separation

Filter

With flow controller for material being treated

137550, 137560, 13762522, 13762532, 13762547, 210426, 210427, 210432, B01D 3504

Patent

active

048062588

ABSTRACT:
A fluid filtering stop valve having a body with a cylindrical chamber having a circumferential sidewall with inlet, outlet and flush ports, and a cylindrical plug member rotatably disposed in the chamber. The plug member has spaced apart first and second circular plates with an off-center filtering screen extending therebetween. The plug member is rotatably between a filtering position in which the screen is located in the fluid flow between the inlet and outlet ports, a backflushing position in which the screen is located in the fluid flow between the inlet and flush ports, with the filtering side of the screen toward the flush port, and a closed position in which an arcuate plate washer loosely retained between the first and second plates is positioned to seal the flush and outlet ports. In the filtering position the washer seals only the flush port and in the flush position the washer seals only the outlet port. The screen uses outwardly diverging ribs to reduce lodging of material between the ribs. A second screen filters the fluid from the inlet port during backflushing.

REFERENCES:
patent: 4386766 (1983-06-01), Bauer et al.
patent: 4613112 (1986-09-01), Philipot et al.
patent: 4646407 (1987-03-01), Mayhew

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