Double seat valve

Details Double seat valve Double seat valve

2011-03-15

2011-03-15

Lee, Kevin L (Department: 3753)

Fluid handling

Systems

Flow path with serial valves and/or closures

C137S240000

Reexamination Certificate

active

07905253

ABSTRACT:
The invention relates to a double seat valve with cleanable seats, the valve including first and second closing elements (3, 4) and a leakage cavity (5). An intermediate seal (8) seals the closing elements (3, 4) in their opening and closing movements and in the open position against each other, is arranged in the second closing element (4). The second closing element (4) abuts in its closed position at a transition area (2e,2e*) with a stop face (4e) arranged at a front face of a cylindrical lug (4*) and that directly adjacent to a first seat (2a,2g), a central recess (4d) is provided in a front face of a second cylindrical lug (4*).

REFERENCES:
patent: 4257442 (1981-03-01), Claycomb
patent: 4757834 (1988-07-01), Mieth
patent: 5904173 (1999-05-01), Ozawa
patent: 6089255 (2000-07-01), Bonnefous et al.
patent: 6178986 (2001-01-01), Burmester
patent: 6349742 (2002-02-01), Borg et al.
patent: 196 08 792 (1997-09-01), None
patent: 0 174 384 (1986-03-01), None
patent: 0 819 876 (1998-01-01), None
patent: 98/54494 (1998-12-01), None

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