| 摘要 |
1. A valve, comprising a valve housing (2) with an inlet (3) and an outlet (4) which have a common centre line along the valve axis (5), a valve body (6) with a bore (8) therethrough, in which the valve body (6) is rotatably arranged about an axis of rotation (7) perpendicular to the bore (8) and arranged to be rotatable between a first position, in which the bore (8) communicates with the inlet (3) and the outlet (4), and a second position, in which a first and a second sealing body (23,30) of the valve body (6) seals against a first and a second valve seat (10,12) by respectively the inlet (3) and the outlet (4) of the valve housing (2), the valve seats (10,12) being in sealing planes (11,13) which are parallel to one another, forming an oblique angle with the inlet (3) and the outlet (4) and the common centre line (5), and in which the sealing bodies (23,30) are positioned in body planes (24,31) parallel to one another, forming a similar oblique angle with the transverse axis (46) of the valve body (6); and in which the valve seats (10,12) and the sealing bodies (23,30) are provided with cooperating, annular sealing surfaces (16,20, 27,34) about their respective axes of symmetry (15,19,26, 33) which are perpendicular to the respective sealing planes (11,13) and body planes (24,31), the sealing surfaces (16, 20,27,34) being curved and forming an oblique angle (α) with their respective sealing planes (11,13) and body planes (24,31), characterized in that the cooperating sealing surfaces (16,20,27,34) have different curvatures. 2. A valve according to Claim 1, characterized in that the contact lines consisting of all contact points (45) formed by the contact between cooperating sealing surfaces (16,20,27,34) which exhibit three eccentricities, wherein a first eccentricity (37) is the shortest distance between the axes of symmetry (15,19,26,33) and the axis of rotation (7) of the valve body (6), and a second eccentricity (38) is the shortest distance between the apexes (18,22), an imaginary extension of the sealing surface (16,20) intersecting the axis of symmetry (15,19) of the valve axis (5), and a third eccentricity (39) is the shortest distance between the apexes (29,36), an imaginary extension of the sealing surfaces (27,34) intersecting the axis of symmetry (26,33) of the valve axis (5) and the axis of the valve body (6) which coincide when the valve is in its closed position. 3. A valve according to Claim 2, characterized in that the curvature of one of the cooperating surfaces (16,20,27,34), preferably that of the valve seat (10,12), is endlessly large, so that the sealing surface (16,20) forms part of a cone surface. 4. A valve according to Claim 2, characterized in that the cooperating sealing surfaces (16,20,27,34) form part of a parabola surface and/or ball surface each. 5. A valve according to Claim 2, characterized in that one of the cooperating sealing surfaces (16,20, 27,34) curves in the opposite direction. 6. A valve according to Claim 2, characterized in that one of the cooperating sealing surfaces (16,20, 27,34) is embodied as an elastic gasket. 7. A valve according to Claim 2, characterized in that the contact points (45) between the sealing surfaces (16,27) and between the sealing surfaces (20,34) form contact lines. 8. A valve according to one or more of the preceding Claims, characterized in that the angle (α) varies along the sealing surface. 9. A valve according to Claim 8, characterized in that the angle (α) is the largest where the distance from the sealing surface to the axis of rotation is the largest. 10. A valve according to Claim 1, characterized in that the annular sealing surfaces (16,20,27,34) are rotationally symmetrical when a small angle is used between the axes of symmetry (15,19,26,33) of the sealing surfaces and the valve axis/transverse axis (5,46) when the valve is in its closed position. |
