A valve (1, 2, 4, 6, 8) for a respiratory device, comprising: a valve housing (10, 20) having an inlet (11, 21) and an outlet (12, 22, 620, 640); a tubular flow channel (18, 28) arranged in said valve housing (10, 20), one end of said tubular flow channel (10, 20) being said inlet (11, 21) and an edge at the other end of said tubular flow channel (10, 20) being configured as a valve seat (17, 27, 625, 645); a chamber (15, 25) arranged between a cylindrical inner surface of said valve housing (10, 20) and an outer surface (16, 26) of said tubular flow channel (18, 28); and a valve body (13, 23) configured such that, in use, said valve body abuts said valve seat (17, 27, 625, 645) when said valve is closed, and when said valve is open, a gap is formed between said valve seat (17, 27, 625, 645) and said valve body (13, 23) allowing a fluid communication from said tubular flow channel (18, 28) into said chamber (15, 25) and out through said outlet (12, 22, 640), wherein: said outlet (12, 22, 620, 640) has an outlet housing; and said outlet (12, 22, 620, 640) is arranged perpendicular to said inlet (11, 21), characterised in that: said outlet (12, 22, 620, 640) has a rectangular, an oblong, a square, or a polygonal shape; and at least one portion of said outlet housing is: planar; arranged parallel to an axial direction of said tubular flow channel (18, 28) and said valve housing (10, 20); and connected to the inner cylindrical surface of the valve housing so that the inner surface of the at least one planar portion of the outlet housing is arranged tangential to the cylindrical inner surface of the valve housing, such that a fluid can flow out from the chamber in a tangent direction along the inner surface of the at least one portion of the outlet housing. a valve housing (10, 20) having an inlet (11, 21) and an outlet (12, 22, 620, 640); a tubular flow channel (18, 28) arranged in said valve housing (10, 20), one end of said tubular flow channel (10, 20) being said inlet (11, 21) and an edge at the other end of said tubular flow channel (10, 20) being configured as a valve seat (17, 27, 625, 645); a chamber (15, 25) arranged between a cylindrical inner surface of said valve housing (10, 20) and an outer surface (16, 26) of said tubular flow channel (18, 28); and a valve body (13, 23) configured such that, in use, said valve body abuts said valve seat (17, 27, 625, 645) when said valve is closed, and when said valve is open, a gap is formed between said valve seat (17, 27, 625, 645) and said valve body (13, 23) allowing a fluid communication from said tubular flow channel (18, 28) into said chamber (15, 25) and out through said outlet (12, 22, 640), wherein: said outlet (12, 22, 620, 640) has an outlet housing; and said outlet (12, 22, 620, 640) is arranged perpendicular to said inlet (11, 21), characterised in that: said outlet (12, 22, 620, 640) has a rectangular, an oblong, a square, or a polygonal shape; and at least one portion of said outlet housing is: planar; arranged parallel to an axial direction of said tubular flow channel (18, 28) and said valve housing (10, 20); and connected to the inner cylindrical surface of the valve housing so that the inner surface of the at least one planar portion of the outlet housing is arranged tangential to the cylindrical inner surface of the valve housing, such that a fluid can flow out from the chamber in a tangent direction along the inner surface of the at least one portion of the outlet housing. said outlet (12, 22, 620, 640) has an outlet housing; and said outlet (12, 22, 620, 640) is arranged perpendicular to said inlet (11, 21), characterised in that: said outlet (12, 22, 620, 640) has a rectangular, an oblong, a square, or a polygonal shape; and at least one portion of said outlet housing is: planar; arranged parallel to an axial direction of said tubular flow channel (18, 28) and said valve housing (10, 20); and connected to the inner cylindrical surface of the valve housing so that the inner surface of the at least one planar portion of the outlet housing is arranged tangential to the cylindrical inner surface of the valve housing, such that a fluid can flow out from the chamber in a tangent direction along the inner surface of the at least one portion of the outlet housing. said outlet (12, 22, 620, 640) has a rectangular, an oblong, a square, or a polygonal shape; and at least one portion of said outlet housing is: planar; arranged parallel to an axial direction of said tubular flow channel (18, 28) and said valve housing (10, 20); and connected to the inner cylindrical surface of the valve housing so that the inner surface of the at least one planar portion of the outlet housing is arranged tangential to the cylindrical inner surface of the valve housing, such that a fluid can flow out from the chamber in a tangent direction along the inner surface of the at least one portion of the outlet housing. planar; arranged parallel to an axial direction of said tubular flow channel (18, 28) and said valve housing (10, 20); and connected to the inner cylindrical surface of the valve housing so that the inner surface of the at least one planar portion of the outlet housing is arranged tangential to the cylindrical inner surface of the valve housing, such that a fluid can flow out from the chamber in a tangent direction along the inner surface of the at least one portion of the outlet housing.