Frank E Marmon

40956148, Jun 20, 1978

Nov 5, 1976

5/734063

Frank E. Marmon - Marietta GA

The United States of America as represented by the Secretary of the Air
Force - Washington DC

F16k 3134
F16k 3102

137414

A system for controlling liquid flow from an inlet into a tank comprising a normally closed poppet valve controlled by dual pressure chambers each containing a diaphragm movable by the pressure of the liquid in the inlet to cause the valve to close. Pressure against the diaphragms is relieved by bleed passages extending from the chambers which are closed by dual solenoid operated closing mechanisms. Actuation of either one or both of the mechanisms can open the bleed passages.

44374879, Mar 20, 1984

Aug 31, 1981

6/297712

Frank E. Marmon - Marietta GA

Lockheed Corporation - Burbank CA

F16K 4300

137322

A drain valve assembly is mounted in the bottom of a fuel tank (10) to allow draining of condensate. The tank (10) is drained of fluid by the use of a tool (27) pushed upward against the piston (18) of the valve assembly separating it from its seat (15) in the valve housing (12) allowing liquid which has entered the housing (12) from the tank (10) through openings (16 ) to exit around the periphery of the unseated valve. If the valve assembly base is struck by lightning, a blast pressure occurs that can drive the poppet of a standard valve open allowing the electrical energy to enter the tank (10) causing a potential explosion. With the present valve assembly the pressure is allowed to pass through passage (20) in the piston (18) to apply a closing force on the surfaces (21, 22) and the inner end of the piston (18) which is greater than the opening force due to the area difference and the valve assembly remains closed.