| 摘要 |
The invention relates to a double-seat valve, the seats of which can be cleaned, which is improved compared to the prior art in that discharge of the seat cleaning flow into and out of the leakage cavity as much as possible without turbulence is ensured, and pressure-increasing direct action on the seat areas is reliably avoided. This is achieved among other things in that the double seat valve (1) has closing elements (3, 4) which can be transferred independently of one another by a respective partial lift gap-wide into the seat cleaning position for purposes of flushing their coaxial seat surfaces (2a, 2b), the second closing element (4) by a second partial lift (T2) which acts in the same direction as the opening motion and the first closing element (3) by a first partial lift (T1) which acts in the direction opposite the opening motion travelling into its respective seat cleaning position, that the second closing element (4) in its closed position with a stop face (4f) which forms a second circumferential edge (U2) with the circumferential wall (4c; 4h) adjoins the second seat surface (2b), directly bordering the first seat surface (2a), that the circumferential wall (4c) on its end facing away from the first closing element (3) undergoes transition into a rotationally symmetrical deflection surface (4d) (starting point of the contour (K)) and this deflection surface (4d) discharges in the front face (4e) of the recess (4b) which is oriented essentially perpendicular to the longitudinal axis of the second closing element (4) (discharge point of the contour (K)), and that viewed in a vertical center section, the deflection surface (4d) has a contour (K) which runs without bends, and the direction vector at the discharge point of the deflection surface (4d) is oriented toward the center discharge bore (3d; 3d*) located in the first closing element (3) without colliding with the first closing element (3) in the area of its regions enclosing the leakage cavity (5) to form impact pressure (FIG. 3).
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