Abstract: An apparatus for controlling the opening and closing operation of a liquid flow valve dispensing fluid fed thereto from a reservoir, using the inherent gas pressure from the reservoir, comprising in combination (a) an actuator means operably connected to the flow valve for opening and closing the same; and (b) control means for controlling the operation of the actuator means, the control means comprising circuitry having pneumatic linear timer means and pneumatic control valve means operably connected one to another and to the actuator means. Also disclosed is a method of controlling the opening and/or closing operation of a liquid flow valve dispensing liquid fed thereto from a reservoir, using the inherent gas pressure from the reservoir.

Abstract: In a refrigerant system for use in cooling the interior of an insulated chamber, the system including at least one fluid reservoir and possibly one or more conduits linked thereto any or all of which may also comprise a reservoir, the system effecting the cooling by means of direct contact of the conduit with the interior of the insulated chamber whereby to achieve a desired refrigerating effect therein, the improvement comprising: insulating with insulation material the reservoir and the conduits if present, to prevent or to substantially prevent direct contact of the same with the interior of the chamber thereby providing a refrigerated barrier intermediate the interior and exterior of the chamber.