Flap valve

Details Flap valve Flap valve

1978-04-24

1980-04-08

Cline, William R.

Fluid handling

Line condition change responsive valves

Direct response valves

137527, 251337, F16K 1503

Patent

active

041967453

ABSTRACT:
A flap valve is provided which includes a valve housing having a valve seat defined therein, on one side of which is a flow inlet chamber and on the other side of which is a flow discharge chamber, at least one locking element pivotably mounted in the valve housing for movement between an open and closed position relative to the valve seat, and at least one locking spring mounted in the flow inlet chamber of the housing having one portion which is rigidly held in the valve housing and a pivotable lever arm which engages the locking element to urge the locking member into the closed position. The lever arm of the spring and the locking member are slideably coupled together so that the force required to open the locking member increases only slightly or preferably decreases during the opening pivotable movement of the locking member.

REFERENCES:
patent: 1708907 (1929-04-01), Spencer
patent: 3640306 (1972-02-01), Vogt
patent: 3965926 (1976-06-01), Buckner
patent: 4043358 (1977-08-01), Sliski

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