Valves and valve actuation – Tube compressors – Pivoting tube contacting element
Patent
1988-03-31
1990-02-27
Chambers, A. Michael
Valves and valve actuation
Tube compressors
Pivoting tube contacting element
251 4, F16K 706
Patent
active
049039350
ABSTRACT:
The improved valve construction provides low force actuation and is therefore suitable in applications where children and handicapped persons may need to operate the valves. The pinch-type valve employs a lever arm pilot which supports a section of tubing in the fluid dispensing circuit. The lever arm is snap fit onto a valve plate and is adapted for rocking movement about a pivot point at one end of the lever arm. A valve cage supports a compression spring which applies a force upon the lever arm tending to depress the lever arm and its associated tube pinching valve seat into pinching contact with the tube. A force applied to the lever arm opposite the pivot point relieves the pinching force and the tube is thus opened for dispensing. An alternate flapper-type valve employs a valve pad encapsulated on the end of a lever arm which is in turn encapsulated in an O-ring seal so that the valve pad is situated at the center of the O-ring and the lever arm is disposed along a radial of the O-ring. The O-ring, lever arm and valve pad assembly is placed in a valve body which provides an inlet and outlet port, the inlet port having a serpentine bend to absorb turbulent shock. A spring is positioned behind the valve pad to hold it in the seated and closed position.
REFERENCES:
patent: 2112625 (1938-03-01), Jackson
patent: 2113022 (1938-04-01), Hefti
patent: 2291267 (1942-07-01), Weiner
patent: 3539081 (1970-11-01), Norton et al.
patent: 3638681 (1972-02-01), Moore et al.
patent: 4428745 (1984-01-01), Williams
Latzko Robert L.
Mrugala Ronald J.
Negandhi Dipak J.
Raymer Doyle
Chambers A. Michael
Fox John C.
King-Seeley Thermos Company
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