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1. WO1990008277 - A BALL VALVE AND ACTUATOR FOR OPERATING VALVES AND THE LIKE

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[ EN ]

C l a i m s

1. Ball valve of the type having a ball member (83, 85) provided with two axially displaceable sleeves (66) which in the open position of the valve are adapted to be displaced outwards for tightly engaging seats (88) provided in the surrounding valve housing (76), so as to form a flow passage (73) through the valve, and having a hollow drive axle (32) for the rotary movement of the ball member between its open and closed positions, and a drive spindle (69) through the hollow drive axle adapted to bring about the axial displacem of the sleeves (66), characterized in that two preferable disc shaped, first cam members (68A, 68B) are provided at either side of the sleeves (66) on the drive spindle (69) for rotation together with the latter, and that the sleeves are provided with corresponding and cooperating second cam members (67A, 67B) for the axial displacement on rotation of the drive spindle (69) in relation to the ball member (83, 85). (Fig. 1, 2, 4C and 4D) .

2. Ball valve according to claim 1, characterized in that the first cam members are formed by two link discs (68, 68A, 68B) provided with grooves (70A, 70B) extending in planes normal to the axis of the drive spindle (69), and that the second cam members are in the form of pin elements (67A, 67B projecting into said grooves so as to be able to slide therein when the drive spindle is rotated.
(Fig. 1, 4C and 4D) .

3. Ball valve according to claim 2, characterized in that each of the link discs (68A, 68B) is provided with two curved, preferably arc-circular grooves (70A, 70B) being spaced at an angle of 180 in relation to each other about the axis of the drive spindle, and which cooperates each wit a pin element (67A, 71, 67Y) on the respective sleeves (66A, 66B) . (Fig. 4C and 4D) .

4. Ball valve according to claim 3 , characterized in that each of the grooves (70A, 70B) is shaped as a circular arc having a centre (72) which, when the sleeves assume their fully outward position, lies in a plane defined by the axis of the drive spindle and the common axis of the sleeves (66A, 66B). (Fig. 4C).

5. Ball valve according to claims 2, 3 or 4, characterized in that each of the grooves (70A, 70B) extend over an effective angular range of 70°-80°, preferably about 75° around the axis of the drive spindle. (Fig. 4C and 4D) .

6. Ball valve according to claims 4 or 5, characterized in that each pin element consists of a round pin (67A) projecti radially from the sleeve (66A) adjacent the inner end thereof, and a slide piece (71) being pivotably mounted on the pin (67A) and having glide surfaces shaped in accordance with cooperating surfaces in the associated groove (70A). (Fig. 4D).

7. Ball valve according to any one of claims 1 to 6, characterized in that a hollow stem (75) for extending the drive spindle (69) diametrically through the flow passage (73, 73A) of the ball member, has a stream-lined cross sectional shape. (Fig. 3).

8. Ball valve according to any one of claims 1 to 7 , characterized in that the drive axle (32) or the ball member (85) is provided with a double-acting stop member (78) adapted to cooperate with a stationary stop element (77) in the valve housing (76), for a well defined limitation of the rotary movement of the ball member towards open and closed position respectively of the valve. (Fig. 1).

9. Actuator for the operation of valves and the like, in particular the valve according to any one of claims 1 to 8, comprising a hollow output drive axle (32) and an output drive spindle (12) extending through the hollow drive axle, thereby to make possible two different operational movements when the drive axle (32) and the drive spindle (12)
respectively are rotated, characterized in that an applied rotary movement on an input axle (17) for example from a hand wheel (16), a hydraulic motor or the like, is transferre to an actuator wheel (4) the axis of which coincides with a common axis for the hollow drive axle (32) and the drive spindle (12 ) , and which is firmly rotationally coupled to the drive spindle, that the actuator wheel (4) and the drive axle (32) have cooperating first carrier means (6, 43) for rotating the drive axle in a first direction from a first given angular position, for example corresponding to an open valve, to a second given angular position, and that the actuator wheel (4) and the drive axle (32) further have cooperating second carrier means (18, 19) for rotating the drive axle in an opposite direction from said second given angular position, for example corresponding to a closed valve, to the first given angular position. (Fig. 1, 4 ) .

10. Actuator according to claim 9, characterized in that it comprises a locking means (2, 3, 33, 53) adapted to fix the drive axle (32) in said second given angular position during rotation of the drive spindle (12) in relation to the drive axle (32). (Fig. 1, 4A, 5A, 5B).

11. Actuator according to claim 10, characterized in that said locking means comprises at least two radially and outwardly open locking grooves (53) at the inner end of the drive axle (32), a locking element (3) adapted' to be pressed into each of the locking grooves (53) and retained against rotation about the axis of th drive axle by means of a stationary locking ring ( 2 ) , and a radially inwards facing control cam (33) on the actuator wheel, for pressing said locking elements ( 3 ) to a locking position into the locking grooves (53), for fixing the drive axle (32) in the second given angular position. (Fig. 5A, 5B).

12. Actuator according to claim 11, characterized in that said locking elements consist of rollers ( 3 ) .

13. Actuator according to claim 11 or 12, characterized in that said locking elements ( 3 ) are symmetrically distributed around the axis of the drive axle.

14. Actuator according to any one of claims 9 to 13, characterized in that the first carrier means (6, 43) is adapted to operate only in said first rotary direction and comprises -a σarrier element ( 6 ) on the actuator wheel ( 4 ) and another carrier element (43) connected to the drive axle (32) and lying at least partly in the path of movement of the carrier element (6) on the actuator wheel. (Fig. 5A) .

15. Actuator according to any one of claims 9 to 14, characterized in that the second carrier means comprise a cam actuated carrier piece (19) which is rotationally connected to the drive axle (32), a carrier groove (18) formed in the actuator wheel (4) for cooperating with the carrier piece (19), and a stationary cam surface (37) for moving the carrier piece. (Fig. 5B and 6B).

16. Actuator according to claims 11 and 15, characterized in that said cam surface (37) is formed at one end face of the locking ring (2). (Fig. 5B).

17. Actuator according to any one of claims 11 to 16, characterized in that there is provided a boss (5) at the inner end of the drive axle (32), and that said locking grooves (32), the second carrier element (43) and the cam actuated carrier piece (19) are provided on the boss (5), the boss (-5) being in part enclosed by the actuator wheel (4). (Fig. 4A).