초록 ▼

A valve device of an application device for applying fluid to a substrate comprises a valve body, a valve housing with inner chamber and valve seat, a supply fluid chamber, an electromagnetic valve actuating device with valve piston and an adjusting piston. The valve nozzle is detachably mounted on

A valve device of an application device for applying fluid to a substrate comprises a valve body, a valve housing with inner chamber and valve seat, a supply fluid chamber, an electromagnetic valve actuating device with valve piston and an adjusting piston. The valve nozzle is detachably mounted on the nozzle side of the valve device. The valve device has a nozzle plate which closes the valve body at the bottom on the nozzle side, with mounting opening for the valve piston. The valve housing is designed in the form of a nozzle orifice which is a closure member that can be fitted on the mounting opening from below and removed. The valve nozzle forms part of the valve housing. The valve piston is exposed through the mounting opening of the nozzle plate for removal and fitting when the closure member is removed. The valve device is provided with at least one rectilinear fluid duct that connects the supply fluid chamber to the valve seat. The valve piston and part of the adjusting piston together form a wall of the straight fluid duct which, when the nozzle orifice closure member is removed, is exposed for cleaning through the mounting opening. An application device comprises the valve devices arranged in a row.

대표청구항 ▼

The invention claimed is: 1. Valve device of an application device for applying fluid to a substrate, comprising a valve body, a valve housing with associated nozzle for emission of the fluid under pressure and having an inner chamber which can admit fluid and a valve seat, a supply fluid chamber w

The invention claimed is: 1. Valve device of an application device for applying fluid to a substrate, comprising a valve body, a valve housing with associated nozzle for emission of the fluid under pressure and having an inner chamber which can admit fluid and a valve seat, a supply fluid chamber which can be subjected to fluid pressure, a fluid connection between supply fluid chamber and valve housing inner chamber, a valve actuating device which is formed by an electromagnetic device with valve piston movable back and forth against a return force and engaging in the valve seat for opening and closing the valve nozzle, and a piston stop which forms an adjusting piston and against which the valve piston operates and which is mounted so as to be displaceable in the direction of the stroke for setting and adjusting the piston stroke, the valve actuating device being arranged between the supply fluid chamber and the valve housing, and the valve nozzle being detachably mounted on the nozzle side of the valve device which comprises it, characterized in that the valve device has a nozzle plate which closes the valve body at the bottom on the nozzle side, with mounting opening for the valve piston, in that the valve housing is designed in the form of a nozzle orifice which is a closure member that can be fitted on the mounting opening of the nozzle plate from below and removed, the valve nozzle forming part of the valve housing, and the valve piston engaging in the valve seat for opening and closing the valve nozzle when the closure member is fitted, while the valve piston is exposed through the mounting opening of the nozzle plate for removal and fitting when the closure member is removed, in that the valve device is provided with at least one rectilinear fluid duct that remains free from flow corners and that, passing the valve actuating device, connects the supply fluid chamber to the valve seat of the valve housing inner chamber, the valve piston and part of the adjusting piston together forming a wall of the straight fluid duct which, when the nozzle orifice closure member is removed, is exposed for cleaning through the mounting opening. 2. Valve device according to claim 1, characterized in that the adjusting piston and the valve piston come into contact with closed surfaces, and between the contact faces there is provided a stroke distance of approximately 0.5 to approximately 50 μm. 3. Valve device according to claim 1, characterized in that the valve piston and the adjusting piston are held in a common piston chamber forming a ring-chamber duct which surrounds the valve piston and part of the adjusting piston and which makes the straight fluid connection between the supply fluid chamber and the valve seat in the valve housing inner chamber. 4. Valve device according to claim 3, characterized in that the valve piston is mounted centrally within the common piston chamber. 5. Valve device according to claim 3, characterized in that the valve body has a projection in which the common piston chamber opens out and which engages in the mounting opening of the nozzle plate. 6. Valve device according to claim 5, characterized in that the inner chamber of the valve housing is shaped frustoconically, corresponding to the projection. 7. Valve device according to claim 5, characterized in that a spring of the valve actuating device is seated on the valve piston and in the pretensioned state is held between an annular edge of the projection and an annular edge at the head end of the valve piston. 8. Valve device according to claim 1, characterized in that the valve housing is screwed in a releasable screw connection into the mounting opening in the nozzle plate. 9. Valve device according to claim 1, characterized in that the valve nozzle is formed with the valve seat on the side of the valve piston. 10. Valve device according to claim 1, characterized in that the inner chamber of the valve housing receives a pretensioned spring which forms part of the valve actuating device and which, when the closure member is removed, is exposed through the mounting opening for removal and fitting. 11. Valve device according to claim 1, characterized in that the adjusting piston extends at least substantially two-thirds in a magnet coil of the valve actuating device, while the valve piston engages in the remaining one-third. 12. Application device for applying fluid to a substrate, comprising valve devices which are arranged in a row and are each equipped with an application valve nozzle for emitting the fluid under pressure and with associated valve actuating device for controlling the emission of fluid by opening and closing the application valve nozzles, comprising a common distributing fluid chamber which can be subjected to pressure from the fluid and which connects the application valve devices to each other for admission of the fluid, the distributing fluid chamber being provided with a fluid intake duct which is arranged in such a way that the fluid which is under pressure in the distributing fluid chamber is distributed along the row of application valve devices to the latter, characterized in that the valve devices are each formed by a valve device according to claim 1. 13. Application device according to claim 12, characterized in that it is formed by a module element which is assembled with identical module elements into an application device with nozzles arranged in rows and columns.