Valves and valve actuation – Tube compressors – Perpendicularly reciprocating tube contacting element
Patent
1988-12-19
1990-01-23
Rivell, John
Valves and valve actuation
Tube compressors
Perpendicularly reciprocating tube contacting element
251 7, 251 634, 251 77, F16K 31163, F16L 5514
Patent
active
048953415
ABSTRACT:
An elastomeric sleeve is placed under axial compression in a pinch valve assembly. The axial compression of the sleeve eliminates any crevices with end members that engage opposed end walls of the valve body. Further, axial compression extends cycle life of the valve by maintaining the sleeve in a non-tensile relationship. Mechanical gripping of enlarged flanges defined at opposed ends of the sleeve is also enhanced through axial compression of the sleeve. A positive, visual indication of valve open and closed positions is provided by an indicator stem extending outwardly from an actuator body. In an alternate embodiment, the flanges are reinforced. Additionally, a casing member is interposed between the valve body and sleeve for ease of replacement and maintenance. In still another embodiment, a vent opening in the valve body eliminates pneumatic closure forces on the elastomeric sleeve that can arise when the pinch valve is heated. The vent opening can also be connected to a valve to provide selective venting of the valve body. In yet another embodiment, an actuator is modified to limit excessive forces on the sleeve during closure.
REFERENCES:
patent: 2890014 (1959-06-01), Luoma et al.
patent: 3166500 (1965-01-01), Noakes et al.
patent: 3236256 (1966-02-01), Valentine
patent: 3350053 (1967-10-01), Schmitz
patent: 3397717 (1968-08-01), Tenkku et al.
patent: 3614169 (1971-10-01), Bueler
patent: 3949964 (1976-04-01), Freeman
patent: 4244278 (1981-01-01), Belart et al.
patent: 4359203 (1982-11-01), Cho
Brown Cal R.
Williams Peter C.
Yusko Jr. Edward M.
Rivell John
Whitey Co.
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