A vented metering pump

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 53/06 (2006.01) F16K 24/04 (2006.01)

Patent

CA 2204917

A pump for metering liquids out of a tank into a delivery line, includes, fitted on the output side, an air-purge device which is designed to separate off gas, in particular air, entrained by the pressurized liquid being conveyed and to lead the gas away into a gas-collection space which is at a pressure lower than that of the liquid. In order to ensure reliable purging, even with corrosive liquids, the pump is designed so that the purging device has a semipermeable membrane, on one side of which the pressurized liquid acts, the other side being in direct contact with the gas- collection space.

La présente invention concerne une pompe de dosage (10) pour le refoulement dosé, dans une conduite de dosage (11), de liquides contenus dans un réservoir (18), cette pompe comportant, monté côté sortie, un système de purge (12) conçu pour séparer le gaz, notamment l'air, entraîné par le liquide refoulé sous pression et pour évacuer ce gaz dans une chambre de dégazage (15) se trouvant à une pression inférieure à celle du liquide. Afin d'assurer une purge fiable, même avec des liquides corrosifs, la pompe est conçue de telle sorte que le système de purge (12) possède une membrane semi-perméable (14), sur une face (14') de laquelle agit le liquide sous pression, l'autre face (14'') étant en contact direct avec la chambre de dégazage (15).

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