Patent ID: 6338467
Filing Date: 2002-01-15
Classification: F16K

Abstract:
A device for connecting and isolating fluid conduits, the device including a casing (1) incorporating at least one fluid passage (10) discharging from the casing via ports adapted to be connected to the conduits and containing at least one butterfly valve (2) fixed to a spindle (3) which can pivot about its longitudinal axis, characterized in that the casing includes two casing members (1A, 1B) having respective joint surfaces which are pressed together in at least one joint plane crossing the passage transversely and passing through the axis of the spindle, and the joint surfaces each include a cavity (12) enlarging the passage all around its perimeter and in which a packing (4A, 4B) is housed, the two packings facing each other across the passage and being pressed together in the joint plane to constitute a sealing ring which incorporates two aligned holes (40) in which two regions of the spindle on respective opposite sides of the butterfly valve are mounted to pivot in sealed contact all around their perimeter, and each packing has a first inside wall portion (41) between the holes on one side of the passage with dimensions adapted to enable the butterfly valve to pivot on this side from a fully open position in which it is approximately longitudinal in the passage to an approximately transverse closed position, and a second internal wall portion (42) between the holes on the other side of the passage and having dimensions adapted to prevent access to the closed position from the side, the first internal wall portion of each packing being adjacent the second portion of the other packing, each second portion projecting farther into the passage than the adjacent first portion over at least part of the length of the packing, to define a face (43) extending transversely to the perimeter of the passage, from one hole of the sealing ring to the other, forming a seat for the butterfly valve, the faces of the two packings forming seats facing in opposite directions.