Valve device

B - Operations – Transporting – 29 – B

Patent

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Details

B29B 7/24 (2006.01) B01F 15/02 (2006.01) B29B 7/74 (2006.01) B29B 7/76 (2006.01) B29B 7/80 (2006.01) F16K 11/16 (2006.01) F16K 31/163 (2006.01) G05D 16/06 (2006.01)

Patent

CA 2347623

The invention relates to a valve device (14) for low-viscosity to high- viscosity fluids, especially for fluid plastic material constituents (12) of single or multiple constituent plastic mixtures. The inventive valve device comprises a valve housing (18) with a fluid inflow (20, 30) and a dosing valve (15) which has a dosing nozzle (22) that can be optionally closed or opened by a closing element (23). Said valve device also comprises a pressure control device (40, 44) which influences the fluid in the fluid inflow. In order to maintain a constant fluid pressure in the housing which is not influenced by the position of the closing element, the invention provides that the pressure control device is essentially comprised of a control membrane (40) which can be pneumatically prestressed and which acts upon the closing element (23). The invention enables a particularly easy isobaric control or regulation of the fluid inflow since the fluid pressure on one side of the membrane and acting upon the same is in equilibrium with the air pressure prevailing on the other side, and since the air pressure and thus the control membrane remain practically unchanged due to the compressibility of the gas when the closing element is displaced.

L'invention concerne un dispositif à soupape (14) pour liquides fluides à visqueux, en particulier pour composants de matières plastiques liquides (12) de mélanges de matières plastiques multicomposants, comprenant un corps de soupape (18) comportant une amenée de liquide (30, 30) et une soupape doseuse (15) présentant une buse de dosage (22) pouvant être obturée ou libérée, au choix, par un élément d'obturation (23), ainsi qu'un dispositif de commande de pression (40, 44) agissant sur le liquide dans ladite amenée de liquide. L'invention a pour but de maintenir une pression de liquide constante, indépendamment de la position de l'élément d'obturation dans le corps de soupape et est caractérisée, en conséquence, en ce que le dispositif de commande de pression est essentiellement constitué par une membrane de commande (40) précontrainte par des moyens pneumatiques, et agissant sur l'élément d'obturation (23). Du fait que la pression du liquide s'exerçant, d'un côté de la membrane, sur ladite membrane, est en équilibre avec la pression d'air régnant de l'autre côté, et que la pression d'air ne varie pratiquement pas en raison de la compressibilité du gaz lors du déplacement de l'élément d'obturation et, par conséquent, de la membrane de commande, l'invention permet d'obtenir particulièrement facilement, une commande ou régulation isobare de l'amenée du liquide.

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