A valve, the valve comprising: a valve body having an inlet conduit, an outlet conduit, and a fluid path extending between the inlet conduit and the outlet conduit; the valve further comprising a valve member situated in the fluid path between the inlet conduit and the outlet conduit; wherein the valve member comprises a solid portion and a first port and a second port and a fluid flow portion (6a; 6b) extending between the first port and the second port; wherein the valve comprises a valve stem anchored to the solid portion of the valve member, the valve stem defining a pivot axis; wherein the valve stem is configured to selectively pivot the valve member about the pivot axis defined by the valve stem to a closed position which closes the fluid path between the inlet conduit and the outlet conduit and to an open position which opens the fluid path between the inlet conduit and the outlet conduit; wherein the fluid flow portion (6a; 6b) has a profile in a plane perpendicular to the pivot axis; wherein the profile of the fluid flow portion (6a; 6b) comprises an arcuate segment (8a; 8b); wherein the inlet conduit defines an inlet flow axis of fluid flow directly into the fluid flow portion (6a; 6b) and the outlet conduit defines an outlet flow axis of fluid flow directly from the fluid flow portion (6a; 6b); wherein the pivot axis is perpendicular to at least one of the inlet flow axis or the outlet flow axis; wherein the fluid flow portion comprises a first cylindrical conduit and a second cylindrical conduit and a knee conduit, the knee conduit having a profile in a plane perpendicular to the pivot axis and the profile of the knee conduit comprising the arcuate segment; the knee conduit is interposed between the first cylindrical conduit and the second cylindrical conduit, characterized in that the valve member comprises first and second separable portions (17a, 17b); and in that the solid portion comprises the second separable portion, the second separable portion having a slot such that the first separable portion can be inserted into the slot of the second separable portion; and in that the first separable portion comprises the first cylindrical conduit and the knee conduit; and in that the first separable portion is mounted inside the slot of the second separable portion by an interference fit. a valve body having an inlet conduit, an outlet conduit, and a fluid path extending between the inlet conduit and the outlet conduit; the valve further comprising a valve member situated in the fluid path between the inlet conduit and the outlet conduit; wherein the valve member comprises a solid portion and a first port and a second port and a fluid flow portion (6a; 6b) extending between the first port and the second port; wherein the valve comprises a valve stem anchored to the solid portion of the valve member, the valve stem defining a pivot axis; wherein the valve stem is configured to selectively pivot the valve member about the pivot axis defined by the valve stem to a closed position which closes the fluid path between the inlet conduit and the outlet conduit and to an open position which opens the fluid path between the inlet conduit and the outlet conduit; wherein the fluid flow portion (6a; 6b) has a profile in a plane perpendicular to the pivot axis; wherein the profile of the fluid flow portion (6a; 6b) comprises an arcuate segment (8a; 8b); wherein the inlet conduit defines an inlet flow axis of fluid flow directly into the fluid flow portion (6a; 6b) and the outlet conduit defines an outlet flow axis of fluid flow directly from the fluid flow portion (6a; 6b); wherein the pivot axis is perpendicular to at least one of the inlet flow axis or the outlet flow axis; wherein the fluid flow portion comprises a first cylindrical conduit and a second cylindrical conduit and a knee conduit, the knee conduit having a profile in a plane perpendicular to the pivot axis and the profile of the knee conduit comprising the arcuate segment; the knee conduit is interposed between the first cylindrical conduit and the second cylindrical conduit, characterized in that the valve member comprises first and second separable portions (17a, 17b); and in that the solid portion comprises the second separable portion, the second separable portion having a slot such that the first separable portion can be inserted into the slot of the second separable portion; and in that the first separable portion comprises the first cylindrical conduit and the knee conduit; and in that the first separable portion is mounted inside the slot of the second separable portion by an interference fit.