Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1988-10-03
1989-05-16
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
138 45, 138 89, 251191, F16K 31122, F16K 702
Patent
active
048303348
ABSTRACT:
In a flow regulator which is operated by axially compressing the two ends of a resilient cylindrical plug causing the plug to swell and expand outwardly to interrupt flow of natural gas and the like, a stress ring is disclosed. In the preferred embodiment, the stress ring is formed of between eight and 36, preferably being about 24, individual wedge shaped segments having equal angles of inclusion and each segment has a surrounding angled tab segment, the tabs collectively encircling the resilient plug. The tabs form a ring which confines the plug so that radial expansion outwardly and contraction inwardly is accomplished while reducing stress concentration. Moreover, the several segments are all joined to the resilient plug by suitable fastening means such as pins inserted through the segments and into the resilient plug.
REFERENCES:
patent: 2917269 (1959-12-01), Welker
patent: 3368787 (1968-02-01), Sachnik et al.
patent: 3380470 (1968-04-01), Culpepper, Jr. et al.
patent: 3572628 (1971-03-01), Jones
patent: 3737139 (1973-06-01), Watts
patent: 3746300 (1973-07-01), Welker
patent: 4206902 (1980-06-01), Barthel et al.
patent: 4310139 (1982-01-01), Williams, III et al.
patent: 4460150 (1984-07-01), Turlak et al.
patent: 4460151 (1984-07-01), Williams, III et al.
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