Double seat valve

Details Double seat valve Double seat valve

2006-04-01

2010-12-07

Lee, Kevin L (Department: 3753)

Fluid handling

Systems

Flow path with serial valves and/or closures

C137S240000, C251S333000

Reexamination Certificate

active

07845368

ABSTRACT:
A double seat valve in which a second closing element (4), in its closed position, rests with a stopping surface (4f) on a face of its cylindrical projection (4*) directly upon a first seat (2a) and, together with a peripheral wall (4c, 4h), forms a second wraparound edge (U2) upon an interface (2e, 2e*). The peripheral wall (4c), at its end facing away from a first closing element (3), merges into a rotationally symmetric reversing surface (4d) that leads to a face (4e) of a recess (4b) oriented essentially perpendicular to the longitudinal axis of the second closing element (4). In 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*) central 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.

REFERENCES:
patent: 4257442 (1981-03-01), Claycomb
patent: 4460014 (1984-07-01), Mases et al.
patent: 4605035 (1986-08-01), Rasmussen et al.
patent: 5645102 (1997-07-01), Brackelmann et al.
patent: 5904173 (1999-05-01), Ozawa
patent: 6178986 (2001-01-01), Burmester
patent: 6676047 (2004-01-01), Lindholm Jensen et al.
patent: 0 174 384 (1986-03-01), None
patent: 0 039 319 (1997-09-01), None
patent: 98/54494 (1998-12-01), None

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