Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1978-07-03
1980-04-29
Cline, William R.
Fluid handling
Line condition change responsive valves
Direct response valves
137527, 251337, F16K 1503
Patent
active
042001170
ABSTRACT:
A fluid flow device having a biased closure structure for selectively closing an opening in a flow conducting structure. The closure includes a pair of closure members pivoted relative to a transverse axis of the opening and biased to the closed position by a spring which is maintained spaced from the closure members in the closed position thereof. The spring has a midportion which is brought into engagement with the closure members as an incident of the movement thereof to and beyond a preselected position intermediate the closed and fully opened positions of the closure members. The spring acts to resiliently bias the closure members toward the closed position as result of the spring tension between the closed position and the intermediate position and the abutment of the midportion of the spring with the closure members at and beyond the intermediate position permits the closure members to be swung toward the fully open position with a decreased force.
REFERENCES:
patent: 1708907 (1929-04-01), Spencer
patent: 2827921 (1958-03-01), Sherman et al.
patent: 3007488 (1961-11-01), Wheeler et al.
patent: 3009473 (1961-11-01), Hennen
patent: 3009475 (1961-11-01), Richterkessing et al.
patent: 3904324 (1975-09-01), Flatt et al.
Anderson Richard M.
Beehler Richard F.
Cline William R.
Heil-Quaker Corporation
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