Check valve for a discharge air duct

Details Check valve for a discharge air duct Check valve for a discharge air duct

1995-06-30

1996-04-23

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

454359, F16K 1504

Patent

active

055094457

ABSTRACT:
Valve (10) comprising a housing (20) with an air inlet (23) mounted at the end of a discharge air duct of a domestic appliance, and with an air outlet (24) communicating with the outside. The valve (10) includes a shoulder (41) sealed to the air inlet (23). A ball (42) is received in the housing (20) and is movable on a guide (43 between first and second positions. When there is no airflow from the duct (60), the ball sealingly engages the shoulder (41) under gravity so as to prevent air from being introduced into the duct from outside through gusts of wind. The shoulder (41) and the ball (42) can be made from an insulating material in order to reduce conductive heat loss in cold weather. When the domestic appliance is operating, the ball (42) moves towards the second position under the discharge airflow in order to evacuate said airflow. As soon as the appliance is stopped, the ball (42) resumes automatically its initial position. The valve (10) may be advantageously mounted on any forced air outlet that can be found on various devices, such as air outlets for driers, for toilet ventilating devices, for air exchangers or kitchen hoods, to replace conventional pivoting valves.

REFERENCES:
patent: 841474 (1907-01-01), Wendelken
patent: 4263936 (1981-04-01), Brown
patent: 4624176 (1986-11-01), Steinke

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