Patent ID: 6494231
Filing Date: 2002-12-17
Classification: B29B,F16K,G05D,Y10S,Y10T

Abstract:
A valve device for low-viscosity to high-viscosity fluids, in particular for fluid plastic components of plastic mixtures having single or multiple components, with a valve housing having a fluid inflow and a dosing valve, which comprises a dosing nozzle that can optionally be closed or opened by means of a closing element, as well as a pressure control device which influences said fluid in said fluid inflow, which consists essentially of a pneumatically pretensionable control membrane which acts on said closing element, wherein said pressure control device is arranged separately from said fluid inflow or the passages holding said fluid in said valve housing by means of a shut-off membrane, said control membrane is part of a pneumatically chargeable pressure control chamber and acts on said closing element formed as a valve needle by means of a plunger which is moveable in said housing, said plunger is charged by said control membrane by means of a pressure pin which is mounted on said control membrane, said pin is supported at said plunger by means of a ball bearing element, said closing element is pretensioned by a spring which is supported in said housing in the direction of said plunger, said closing element of said dosing valve can be moved by means of an actuating device for closing or opening said dosing nozzle, said actuating device essentially consists of a control lever which can be actuated by an actuating cylinder, which is mounted pivotally in said housing, which acts on said closing element or a plunger against said spring, said dosing valve and said recirculation valve or their respective closing elements can be actuated by said control lever.