F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/62
F16K 1/44 (2006.01)
Patent
CA 1256417
ABSTRACT A double seat valve is disclosed, of the type comprising: a valve housing having at least two conduit openings for fluid in- let and outlet, two coaxial valve seats disposed between the open- ings, two valve closure members each guided in the valve housing for coaxial movement relative to each other and to their respective valve seats between an open position and a closed position, realising together in their closed position a double seal between the openings, a first closure member being adapted to abut during its opening movement against the second closure member and to move the latter during further opening movement also into its open position, a leakage space defined between the closure members in both the closed and the open position thereof, a drain outlet permanently connecting the leakage space to the outside of the valve, and drive means for moving the first and second closure members between the closed and open positions, respectively, at least one closure member being a slide piston having radial sealing means and being operative to slide between an open position and a closed position sealingly received in a cylindrical valve seat and the other closure member being provided at its end facing the slide piston with a recess having a substantially cylindrical seatwall coaxial to the cylindrical valve seat and dimensioned to sealingly receive during opening movement the end portion of the slide piston before the second closure member opens, wherein the improvement comprises the following features; at least one of the cylindrical valve seat and the cylindrical seat wall of the recess is provided with a circumferential annular groove at a position passed by the radial sealing means of the slide piston during its movement between the closed position and the open position, the annular groove is dimensioned to permit in a predetermined intermediate position of the radial sealing means opposite the annular groove a seat-cleaning flow of liquid along the cylindrical valve seat and between the opposed circumferential surfaces of the radial sealing means and the annular groove, and there are provided drive means for moving the first closure member between its closed position and the intermediate position.
463039
Lading Stig
Lundquist Gunner
Rasmussen Erik
Alfa Laval Lkm A/s
Fetherstonhaugh & Co.
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