Abstract: A liquid dispensing device has a chamber (11) for a liquid. The chamber has first and second openings (17), (18); a one way valve (19) retained in the first opening to allow liquid flow only out of the chamber; and a closure (13) slidably retained in the chamber to close the second opening. The closure has an actuator (22, 24) with a flexible element (21) which, extends into the chamber reducing its volume and thereby causing liquid to be expelled from the chamber through the valve. The closure slides in the chamber to reduce the volume of the chamber by the amount of the dispensed liquid.

Abstract: A self-actuating temperature sensitive seal comprised of a bimetallic C-ring. Differences in the relative rates of thermal expansivity of the inner face and the outer face of the C-ring cause the C-ring to expand or contract in response to temperature variations. Expansion of the C-ring will create a seal, and contraction of the C-ring will remove the seal between the surfaces surrounding the C-ring. The bimetallic ring may also be used in combination with a spring-biased soft seal made of a fluorocarbon polymer, such as Teflon, to form a fire-safe composite seal. In cryogenic applications, the bimetallic C-ring can provide a seal by itself, or as a biasing element within a surrounding soft jacket.