Fluid handling – Line condition change responsive valves – Safety cut-off requiring reset
Patent
1980-04-14
1981-05-26
Weakley, Harold W.
Fluid handling
Line condition change responsive valves
Safety cut-off requiring reset
137517, 137DIG2, F16K 1700
Patent
active
042692237
ABSTRACT:
A resettable overrun control valve includes a housing with a throughbore defining an inlet, an outlet and an intermediate valve seat. A valve disc is normally biased from the valve seat by a coil spring projecting the disc toward the inlet. An actuator stem connects to the valve disc and is responsive to a manually operable control rod projecting through the housing to engage the stem. Normal pneumatic pressure through the inlet permits air flow about the valve disc and through the outlet. If the pressure drop on the downstream side of the valve disc exceeds a predetermined limit, the valve disc is forced against the valve seat. This terminates air flow. Once the reason for the excessive air flow through the valve is corrected, the valve may be reset by actuating the manual rod against the stem. The biasing force on the valve disc is adjusted by means of a telescoping housing that cooperates with the valve body. The housing serves as an adjustable platform for the coil spring which biases the valve disc.
REFERENCES:
patent: 2262062 (1941-11-01), Strong
patent: 2806484 (1957-09-01), Sohultz
patent: 2926690 (1960-03-01), Martin
patent: 3106226 (1964-10-01), Machen
patent: 4010770 (1977-03-01), Peters
Carter Raymond D.
Clark Allen L.
The Aro Corporation
Weakley Harold W.
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