초록 ▼

In order to improve a drive arrangement (15) for valve devices (1) comprising a closing member (3), comprising a movable drive element (6) for making an operative connection with the closing member (3), pre-tensioning means for exerting a pre-tensioning force on the drive element (6) in order to hol

In order to improve a drive arrangement (15) for valve devices (1) comprising a closing member (3), comprising a movable drive element (6) for making an operative connection with the closing member (3), pre-tensioning means for exerting a pre-tensioning force on the drive element (6) in order to hold the closing member (3) in a base position, preferably closed position, against the working forces acting on the closing member (3), and driving means (17, 21) to move the drive element (6) from the base position against the pre-tensioning force in the direction of the working forces, with a view to the disadvantages of the known drive arrangements, in particular in order to reduce the weight, it is proposed that the pre-tensioning means comprises a compressible fluid, preferably compressed air (21), enclosed in a pre-tensioning container (16), with a static pressure for producing the pre-tensioning force.

대표청구항 ▼

1. A drive arrangement for a valve device, the valve device having a closing member, the closing member having a movable drive element for making an operative connection with the closing member, pre-tensioning means for exerting a pre-tensioning force on the drive element for holding the closing mem

1. A drive arrangement for a valve device, the valve device having a closing member, the closing member having a movable drive element for making an operative connection with the closing member, pre-tensioning means for exerting a pre-tensioning force on the drive element for holding the closing member in a base position against working forces acting on the closing member, and driving means capable of moving the drive element from the base position against the pre-tensioning force in the direction of the working forces, wherein the pre-tensioning means comprises compressed air enclosed in a pre-tensioning container, with a static pressure for producing the pre-tensioning force, wherein the volume of the pre-tensioning container is a multiple of the stroke volume of the drive element and the pre-tensioning container is provided with connecting means, the connecting means being configured for connection to a second pre-tensioning container of a second drive arrangement of a similar type, wherein the movable drive element is movable independently of a movable drive element of said second drive arrangement, wherein the drive arrangement comprises a valve-side pressure chamber and wherein the valve-side pressure chamber is so constructed and arranged as to be capable of increasing a static pressure in the valve-side pressure chamber until the pressure in the valve-side pressure chamber exceeds the static pressure in the pre-tensioning container, to move the drive element. 2. The drive arrangement according to claim 1, wherein the drive element comprises a cylinder and a driving piston which can be moved inside the cylinder. 3. The drive arrangement according to claim 2, wherein the pre-tensioning container is configured as a section of the cylinder. 4. The drive arrangement according to claim 2, wherein the volume of the pre-tensioning container is at least four times the stroke volume of the drive element. 5. The drive arrangement according to claim 1, wherein the volume of the pre-tensioning container is a multiple of at least four times the stroke volume of the drive element. 6. The drive arrangement according to claim 1, wherein the pre-tensioning container has connecting means for connection of an expansion pre-stressing vessel on a side of the drive element facing away from the closing member. 7. The drive arrangement according to claim 1, wherein the driving means comprise compressed air. 8. The drive arrangement according to claim 1, wherein the pre-tensioning container is provided with a pressure connection for connection to a compressed air supply. 9. The drive arrangement according to claim 8, wherein the pressure connection is configured in communication with a non return valve. 10. The drive arrangement according to claim 8, wherein the compressed air supply comprises a compressed air reservoir or a compressor. 11. The drive arrangement according to claim 1, wherein the pre-tensioning container is configured in communication with a pressure relief valve. 12. The drive arrangement according to claim 1, wherein the base position is a closed position. 13. An ensemble comprising at least two drive arrangements, each according to any one of claim 1, 2, 12, 4 or 10, wherein the pre-tensioning containers of the at least two drive arrangements are configured as being in communication with one another.