Abstract: An internal valve for the bottom loading of fuel tanks consists of a differential area piston acting within a chamber which is vented by a pair of pilot valves responsive to fluid level, to provide full open, throttled and closed positions of the valve automatically in response to inlet fluid pressure. Soft closure of the inlet valve which is formed of the piston head and a seat in the valve housing, is provided by metered fluid flow through an orifice between a sized aperture in the piston head and a restrictor sleeve carried on a tank vent actuator bar extending through the aperture and through the valve housing. A lost motion connection between the piston head and actuator bar allows limited relative movement for controlling the metering orifice and combined movement for coincident opening of the tank vent in response either to inlet fluid pressure or manual actuation.

Abstract: A servo valve controlled hydrant valve for aircraft fueling has a removable adaptor for the hose coupling and includes a clamping device which assures that the servo valve is deactuated before the adaptor housing can be unbolted for removal. Deactuation of the servo valve closes the vent line in a piston-cylinder main valve arrangement thereby assuring closure of the main valve.

Abstract: A joint between two members and a gasket therefor. The members have transverse annular opposed faces. The gasket is a ring having a base and a frusto-conical lip extending radially inward from the base. The base is adapted to be clamped between the two faces of the members and has serrations on one side thereof for establishing sealing contact with one of the faces. The frusto-conical lip extends axially toward the other face and is subject to fluid pressure for ensuring sealing contact therewith.