Diverter valve for an extruder, in particular a twin-screw extruder
View Patent ↗A diverter valve is provided for an extruder, especially a twin-screw extruder, that allows for the replacement of the extruder screws without dismounting the same. The diverter valve includes a valve housing with a first flow passage, which can be fastened indirectly or directly to an extruder cylinder, whereby the valve housing can be arranged on the extruder cylinder with the first flow passage aligned with the screw area. The cross section of the first flow passage is constructed large enough to pass extruder screws arranged in the extruder through the flow passage. The diverter valve further includes a valve bolt having its axis arranged basically perpendicular in relation to the direction of flow of a liquid or a melt, with at least an additional flow passage, which can be oriented in alignment with the first flow passage of the valve housing and whose cross section is likewise constructed large enough to pass extruder screws arranged in the extruder through this second flow passage, whereby the valve bolt is arranged adjustably in the valve housing.
1. A diverter valve for an extruder, comprising:
a valve housing having a first flow passage, the valve housing being fastenable directly or indirectly on an extruder cylinder such that the first flow passage is arranged in alignment with a screw area of the extruder cylinder, wherein a cross-section of the first flow passage is constructed large enough to allow an extruder screw arranged in the extruder to pass through the first flow passage;
a valve bolt having an axis substantially perpendicular to a flow direction of a liquid or a melt in the valve housing, the valve bolt having at least one further flow passage which can be arranged in a position aligned with the first flow passage of the valve housing, a cross-section of the further flow passage being constructed large enough to pass the extruder screw through the further flow passage; and
wherein the valve bolt is arranged adjustably in the valve housing.
2. The diverter valve according to claim 1 , wherein the first and further flow passages are constructed in the form of spectacle-type boreholes for a twin-screw extruder.
3. The diverter valve according to claim 1 , wherein a groove-like recess is arranged on an outer periphery of the valve bolt, in addition to the further flow passage, axially at the same height with said further flow passage, but radially offset therefrom.
4. The diverter valve according to claim 2 , wherein a groove-like recess is arranged on an outer periphery of the valve bolt, in addition to the further flow passage, axially at the same height with said further flow passage, but radially offset therefrom.
5. The diverter valve according to claim 3 , wherein the first flow passage includes an inlet channel and an outlet channel in the valve housing, which channels can be connected for flow purposes through the further flow passage in the valve bolt.
6. The diverter valve according to claim 4 , wherein the first flow passage includes an inlet channel and an outlet channel in the valve housing, which channels can be connected for flow purposes through the further flow passage in the valve bolt.
7. The diverter valve according to claim 3 , wherein an inlet channel and a starting channel are provided in the valve housing, which channels can be connected with each other for flow purposes through the groove-like recess in the valve bolt.
8. The diverter valve according to claim 4 , wherein an inlet channel and a starting channel are provided in the valve housing, which channels can be connected with each other for flow purposes through the groove-like recess in the valve bolt.
9. The diverter valve according to claim 5 , wherein an inlet channel and a starting channel are provided in the valve housing, which channels can be connected with each other for flow purposes through the groove-like recess in the valve bolt.
10. The diverter valve according to claim 6 , wherein an inlet channel and a starting channel are provided in the valve housing, which channels can be connected with each other for flow purposes through the groove-like recess in the valve bolt.
11. The diverter valve according to claim 1 , wherein the valve bolt is arranged such that a central axis of the extruder screw or the two central axes of the two extruder screws of a twin-screw extruder, intersect with a central axis of the valve bolt.
12. The diverter valve according to claim 2 , wherein the valve bolt is arranged such that a central axis of the extruder screw or the two central axes of the two extruder screws of a twin-screw extruder, intersect with a central axis of the valve bolt.
13. The diverter valve according to claim 1 , further comprising, a drive for activating the valve bolt.
14. The diverter valve according to claim 2 , further comprising, a drive for activating the valve bolt.
15. The diverter valve according to claim 3 , further comprising, a drive for activating the valve bolt.
16. The diverter valve according to claim 5 , further comprising, a drive for activating the valve bolt.
17. The diverter valve according to claim 1 , wherein the diverter valve is incorporated into a housing of an extruder.