Proportioning valve and control means therefor

Details Proportioning valve and control means therefor Proportioning valve and control means therefor

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 11/065 (2006.01) G05D 11/02 (2006.01) G05D 11/13 (2006.01)

Patent

CA 2231881

A closed loop control system is provided herein for controlling the mixture of a first liquid with a second liquid to produce a liquids mixture having a desired proportion of the first liquid to the second liquid. They closed loop control system includes first supply conduit for supplying a first liquid, a second supply conduit for supplying a second liquid, and a proportioning valve. The proportioning valve has a valve body, a first inlet for receiving the first liquid, a second inlet for receiving the second liquid and an outlet for expelling an output flow of a third liquid comprised of a mixture of the first liquid and the second liquid. The proportioning valve apparatus further includes a first input conduit for communicating the liquid between tile first supply conduit and the first inlet, a second input conduit for communicating the second liquid between the second supply conduit and the second inlet and a valve controller for controlling the rate of flow of the first liquid through the first inlet and for controlling the rate of flow of the second liquid through the second inlet. A density measurement element is provided for measuring the density of the liquids output flow. A signaller is coupled to the density measurement element for producing signals which are representative of the density of the output flow of liquid. A signal processor is coupled with the signaller and the valve control element for receiving the signals. Responsive to the signals received, the signal processor controls the rate of flow of the first liquid through the first inlet and controls the rate of flow of the second liquid through the second inlet, thereby to produce an output liquid mixture having a desired proportion of the first liquid to the second liquid.

Ce robinet doseur comporte un corps cylindrique (3) possédant un premier orifice d'admission (11) pour la réception d'un premier fluide, un deuxième orifice d'admission (13) pour la réception d'un deuxième fluide, une chambre de mélange (27), et un orifice de sortie (15) pour libérer un mélange des deux fluides respectifs introduits. Un élément barrière rotatif (21) est positionné de manière adjacente aux premier (11) et deuxième (13) orifices d'admission et sert à empêcher sélectivement l'écoulement des fluides par les premier et deuxième orifices d'admission et jusque dans la chambre de mélange (27). La rotation de l'élément barrière (21) dans un premier sens permet de fermer le premier orifice d'admission (11) tout en ouvrant simultanément le deuxième orifice d'admission (13). L'invention concerne également un système de commande en boucle fermée faisant appel à la mesure de la densité du mélange de sortie pour commander l'actionnement du robinet doseur.

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