| 摘要 |
The invention relates to a double seat valve, which is capable of cleaning the seat and which is improved compared to that of the prior art, whereby a delivery as free from turbulence as possible of the seat cleaning flow into and out of the leakage cavity is ensured, and a pressure-increasing direct action upon the seat areas is reliably prevented. This is achieved in that: the second closing element (4), when in its closed position, rests with a stopping surface (4f), which is placed on a face of its cylindrical projection (4*) and which, together with the peripheral wall (4c, 4h), forms a second wraparound edge (U2), upon the interface (2e, 2e*), and to be precise, directly upon the first seating (2a) in an adjoining manner; the peripheral wall (4c), at its end facing away from the first closing element (3), merges into a rotationally symmetric reversing surface (4d) (starting point of contour K)), and this reversing surface (4d) leads in a face (4e) of the recess (4b) oriented, in essence, perpendicular to the longitudinal axis of the second closing element (4) (leading point of contour K)), and; when viewing the meridian section, the reversing surface (4b) has a contour (K) with a bend-free curve, a direction vector in the leading point of the reversing surface (4d) points into a discharge borehole (3d, 3d*) centrally provided in the first closing element (3) without colliding with the first closing element (3) in the vicinity of its areas bordering the leakage cavity (5) and forming dynamic pressure.
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