Patent ID: 8905374
Filing Date: 2014-12-09
Classification: F16K

Abstract:
1. A double disc gate valve comprising a casing forming a fluid passageway, inlet and outlet seats, and a closure member movable relative to the passageway along a centre plane in an inwards direction for obtaining a closed configuration of the valve and in an opposite outwards direction for obtaining an open configuration of the double disc gate valve the closure member comprising two valve discs and a disc manipulation structure with an inner and an outer disc carrier, both disc carriers being connected to both valve discs, the disc manipulation structure being adapted to change orientation of at least one of the two valve discs away from an initial orientation by movement of the outer disc carrier relative to the inner disc carrier, wherein the relative movement between the disc carriers is initiated as an integrated part of a closing and opening procedure during movement of the closure member in the inwards and outwards directions, wherein the change in orientation of at least one of the valve discs includes a movement away from a configuration where the valve discs are parallel to a configuration in which the valve discs are not parallel or a movement from a configuration in which the valve discs are not parallel to a configuration in which the valve discs are parallel, and wherein both disc carriers are connected to both valve discs by a linkage structure comprising an outer link and an inner link that allow one of the inner disc carrier and outer disc carrier to move, at least partially, while an other of the inner disc carrier and outer disc carrier remains stationary, the outer link comprising a first and a second outer element, the first outer element being rotationally fixed to the outer disc carrier and to one of the valve discs, and the second outer element being rotationally fixed to the outer disc carrier and to the other valve disc, and the inner link comprises a first and a second inner element, the first inner element being rotationally fixed to one of the valve discs and to the inner disc carrier and the second inner element being rotationally fixed to the other valve disc and to the inner disc carrier.