Abstract: Aspects and embodiments relate to a gas flow alarm apparatus and gas flow alarm method. The apparatus comprises: a device configurable to introduce back pressure into a flow of gas, a supply sensor configured to determine whether gas flow to the device is enabled; a pressure sensor configured to determine whether a flow of gas through the device has developed back pressure; and logic circuitry in communication with the supply sensor and the pressure sensor configured to determine whether gas flow to the device is enabled and whether a flow of gas through the device has developed back pressure and, if not, to activate an alarm condition. Aspects and embodiments can provide a system which operates to warn a user against various adverse conditions in which a flow of therapeutic gas to a patient is required, yet not being provided.

Abstract: The disclosed coupling can include an elongate body having an opening at each end, the openings linked by a conduit; a valve assembly located within the elongate body. The valve assembly is movable between an open position, in which gas can pass between the openings along the conduit, and a closed position in which gas flow between the openings is prevented; a biasing assembly arranged within the elongate body to move the valve assembly into the closed position; and a heat activatable stop located in the region of each opening, operable to hold the valve assembly in the open position against the biasing assembly, and adapted to release the valve assembly to allow the biasing assembly to move the valve assembly to the closed position at an activation temperature.

Abstract: The disclosed coupling can include an elongate body having an opening at each end, the openings linked by a conduit; a valve assembly located within the elongate body. The valve assembly is movable between an open position, in which gas can pass between the openings along the conduit, and a closed position in which gas flow between the openings is prevented; a biasing assembly arranged within the elongate body to move the valve assembly into the closed position; and a heat activatable stop located in the region of each opening, operable to hold the valve assembly in the open position against the biasing assembly, and adapted to release the valve assembly to allow the biasing assembly to move the valve assembly to the closed position at an activation temperature.

Abstract: Apparatus for use in delivery of gas capable of combustion that incorporates a safety valve unit. The safety valve unit closes the flow path of the gas from the source upon occurrence of a fire. The safety valve unit has a valve body, a valve head resiliently biased towards a valve-closure position and a fusible retainer that holds the valve member in a valve open position. The valve body defines a fluid flow passage between an outlet and the valve head. Within the fluid flow passage there is an elongate link member which extends from the valve head to the foot. The foot engages the fusible retainer.

Abstract: A modular coupling system allows a combined gas canister and integral regulator to be used with a wide range of different utilizer devices such as flow meter, conservor or delivery apparatus. A first coupling part is secured to the pressurized gas canister permanently, and carries a combined main delivery valve and venting valve to allow connection of the gas utilizer to the canister by means of a second coupling part formed integrally with or attached to the gas utilizer device by a simple push and twist action which, upon fitting, closes the venting valve; and opens the main delivery valve in sequence.