A valve assembly for modulating flow of a fluid through a valve, the valve assembly comprising: a flange with an orifice, a first disc with an orifice, at least a plunger, and a second disc connected to the at least a plunger, a gasket (5, 5a, 5b) in between the flange and the first disc, the gasket (5, 5a, 5b) being in contact with the flange and in contact with the first disc, wherein the gasket (5, 5a, 5b) forms a closed loop, the valve assembly further comprising three bearing members (3a, 3b, 3c) interposed between the first disc and the flange, wherein the three bearing members (3a, 3b, 3c) define the position and the orientation of the first disc with respect to the flange, wherein the three bearing members (3a, 3b, 3c) separate the first disc from the flange, thereby defining a gap between the flange and said disc, the valve assembly comprising a fluid path connecting the orifice of the flange via the gap between the flange and the first disc to the orifice of the first disc, wherein said fluid path has a portion inside said gap, wherein the gasket (5, 5a, 5b) seals said portion of the fluid path such that any fluid flow into and / or out of said portion is required to flow through at least one of the orifices (4, 6), wherein the first disc and the second disc each provide surfaces in mutual abutment, wherein the at least a plunger is configured to displace the second disc along said mutually abutting surfaces from a first position to a second position, wherein the second disc in its first position covers the orifice of the first disc thereby obturating fluid flow along said fluid path, wherein the second disc in its second position at least partially uncovers the orifice of the first disc thereby enabling fluid flow along said fluid path. a flange with an orifice, a first disc with an orifice, at least a plunger, and a second disc connected to the at least a plunger, a gasket (5, 5a, 5b) in between the flange and the first disc, the gasket (5, 5a, 5b) being in contact with the flange and in contact with the first disc, wherein the gasket (5, 5a, 5b) forms a closed loop, the valve assembly further comprising three bearing members (3a, 3b, 3c) interposed between the first disc and the flange, wherein the three bearing members (3a, 3b, 3c) define the position and the orientation of the first disc with respect to the flange, wherein the three bearing members (3a, 3b, 3c) separate the first disc from the flange, thereby defining a gap between the flange and said disc, the valve assembly comprising a fluid path connecting the orifice of the flange via the gap between the flange and the first disc to the orifice of the first disc, wherein said fluid path has a portion inside said gap, wherein the gasket (5, 5a, 5b) seals said portion of the fluid path such that any fluid flow into and / or out of said portion is required to flow through at least one of the orifices (4, 6), wherein the first disc and the second disc each provide surfaces in mutual abutment, wherein the at least a plunger is configured to displace the second disc along said mutually abutting surfaces from a first position to a second position, wherein the second disc in its first position covers the orifice of the first disc thereby obturating fluid flow along said fluid path, wherein the second disc in its second position at least partially uncovers the orifice of the first disc thereby enabling fluid flow along said fluid path.