Process and device for regulating a flow of liquid CO.sub.2, and application thereof in a cooling tunnel
AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorPatrick Micheau
Life of this patent
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Abstract
According to the process, there is maintained in a conduit (3), on the downstream side of a valve (5), up to the vicinity of the point A of injection of the CO.sub.2, an intermediate pressure (PI) higher than the pressure (PT) of the triple point of the CO.sub.2. Application in the treatment of waste waters or the deep freezing of food.
Claims10
Process for regulating a flow of liquid CO.sub.2 in a thermally-insulated first conduit provided with a regulating valve, there being a point of discharge of said CO.sub.2 from said first conduit downstream from said regulating valve, said process comprising maintaining in a permanent manner throughout the flow in the first conduit, on the downstream side of the valve, up to the vicinity of said point of discharge of the CO.sub.2, an intermediate pressure which is higher than the pressure of the triple point of the CO.sub.2, the maintaining of said intermediate pressure being effected by the delivery of CO.sub.2 to said first conduit via second conduit means communicating with said first conduit and having a check-valve that prevents flow of fluid in a direction away from said first conduit.
A device for regulating a flow of liquid CO.sub.2, comprising a reservoir of CO.sub.2 under pressure, a first conduit connected to the reservoir for drawing off liquid CO.sub.2, a regulating valve inserted in said first conduit, a second conduit connected to the reservoir for drawing off gaseous CO.sub.2, a pressure reducer and a check-valve inserted in said second conduit, said second conduit being connected to said first conduit in a section of said first conduit on the downstream side of the regulating valve, a discharger connected to an end of said first conduit, the discharger comprising a membrane, a valve closure member carried by the membrane, an ejection valve seat with which seat said closure member is cooperative, said valve seat constituting an outlet of the discharger, and a spring having an adjustable effect biasing said membrane to a position for applying the closure member against said seat.
Dependencies are inferred from the claim text.