The present disclosure is directed to a combination air valve that uses buoyancy to lift seals into place, preventing media from escaping from the valve. Once the seals are in place, pipeline pressure is used to open and close the valve. The combination air valve includes a piston assembly which includes a main disc, a piston head located above the main disc, a float below the main disc, and a float shaft joining the float to the piston. When no media is in the valve the float is at the bottom of the valve and the main disc is down, allowing gases to leave the valve. The float is lifted as media enters the valve, thus using buoyancy to lift the main disc into place, preventing media from escaping from the valve. Once the seals are in place, pipeline pressure is used to open and close the valve.

A device for preventing the overflow of a fluid reservoir, having a first tubular body with a hole through the interior and exterior surfaces at one end, a second tubular body disposed within the first body such that a portion of the interior surface of the first body and the exterior surface of the second body define an air channel, and a floatation device. The position of the tubular bodies relative to one another determine whether air from a fluid reservoir may exit the reservoir via the hole in the end of the first body. The flotation device is connected to an end of the second body and floats in the fluid reservoir wherein movement of the second body relative to the first body is caused by a change in the water level, such that the air channel is opened or closed by the position of the floatation device.

A drain valve has a housing defining a drain conduit for the passage of fluids to be drained, the drain conduit having a first rim defining an inlet to the drain conduit opposite a second rim defining an outlet from the drain conduit. One or more non-return valves are within the drain conduit between the first rim and the second rim and have a closed configuration and an open configuration adapted to allow fluids to flow through the outlet of the drain conduit. A vent conduit extends within the drain conduit and comprises internally a lower valve seat, an upper valve seat and a bypass valve positioned between the lower valve seat and the upper valve seat. The bypass valve is adapted to allow gas to bypass the one or more non-return valves and escape to atmosphere when the gas reaches a predetermined pressure.

A modular potable water distribution manifold for an aircraft water supply and drainage system includes a tubular element with a first manifold quick connector adapted to mate with a flexible hose connector and having a flow control poppet, a second manifold quick connector having a flow control poppet, the second manifold quick connector adapteded mate with a terminating self-venting/self-draining device, and a rotating ferrule that mates the second manifold with the self-venting/self-draining device.

The present invention relates to a vent valve with a vent opening for venting a liquid tank in a motor vehicle, with a float in a float chamber for closing the vent opening; and a plurality of guide ribs for guiding the float in the float chamber, which guide ribs are formed by a housing of the float chamber and protrude into the interior of the float chamber.

A drain valve device includes a drain valve housing arranged to be located within a drain opening. The housing has a wall structure surrounding an axis so as to define an internal flow passage through the housing and a strut member depending radially inwardly from the wall structure. The device has one or more valve members. A gas vent passage may be provided in the housing and a vent valve or control member may be provided to selectively prevent flow through the gas vent passage.

A vent valve assembly for use with a fuel tank may comprise a housing having outer and inner wall structures that define a chamber therebetween, and a float located inside the chamber and configured to be translatable relative to the housing along an axis. The float has an orifice extending along the axis. The inner wall structure of the housing is disposed within the orifice of the float, facing an inner surface of the orifice. The vent valve assembly also comprises one or more guiding features located on the inner surface of the orifice, and one or more mating guiding features located on the inner wall structure of the housing and configured to mate with the guiding features. The guiding features and mating guiding features cooperate to guide translation of the float relative to the housing along the axis and restrict rotation of the float about the axis.