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A sealing system in a ball valve is designed with a bellows which carries a sliding packing ring on the side of the valve housing and presses against a sliding packing ring on the side of the pivot shaft. The bellows is protected by a guard ring. The ball valve has a shaft coupled to a cap through a

A sealing system in a ball valve is designed with a bellows which carries a sliding packing ring on the side of the valve housing and presses against a sliding packing ring on the side of the pivot shaft. The bellows is protected by a guard ring. The ball valve has a shaft coupled to a cap through a releasable locking device.

대표청구항 ▼

1. A valve including a valve housing with a flow axis, a valve member in said valve housing, which valve member is pivotal about a pivotal axis which is perpendicular with respect to the flow axis, a pivot shaft which is connected fixed against rotation to the valve member and is guided through a le

1. A valve including a valve housing with a flow axis, a valve member in said valve housing, which valve member is pivotal about a pivotal axis which is perpendicular with respect to the flow axis, a pivot shaft which is connected fixed against rotation to the valve member and is guided through a lead opening in the valve housing and is supported pivotally about the pivot axis, and a sealing system between the pivot shaft and the valve housing for sealing off the lead opening, said sealing system being designed with a base ring which is statically sealed off on the valve housing and surrounds the pivot shaft, a bellows which projects from said base ring away from the flow axis and is connected fixed against rotation and tightly to the base ring and surrounds the pivot shaft; a bellows end ring which surrounds the pivot shaft and is connected fixed against rotation and tightly to the bellows on its end which is remote from the flow axis, a first sliding packing ring which is attached fixed against rotation and tightly to the bellows end ring and which surrounds the pivot shaft, and a second sliding packing ring which surrounds the pivot shaft, said two sliding packing rings resting sealingly and slidingly on one another under a sealing pressure produced in part by the bellows, and the second sliding packing ring being mounted tightly and fixed against rotation on a tightly sealed cap which grips over the end of the pivot shaft, which end is the radial outer end with respect to the flow axis, said cap being screwed to the pivot shaft for an adjustable movement, the improvement wherein the cap has at its end remote from the flow axis an opening tightly sealed off by a removable cap lid, a releasable locking means is stored inside of the cap and is releasable when the cap lid is released for allowing a biasing pressure of the bellows to be selectively adjusted by rotating the cap on the screwed pivot shaft prior to the securing of the cap lid and the locking means, said locking means securing the cap against rotational screwed movement relative to the pivot shaft, and working surfaces for engagement by a tool are provided on the cap or on the cap lid, thereby permitting the pivot shaft to be pivoted for moving the valve member, while preventing any axial movement of the sealing system and maintaining the preselected bellows biasing pressure. 2. A valve according to claim 1, wherein the locking means is formed by a fork member with axially extending fork legs which rest on flat portions of the pivot shaft, the fork member is constructed fixedly in one piece with the cap lid, and the cap lid is nonrotably secured on the cap. 3. A valve according to claim 2, wherein the cap lid is secured to the cap by threaded fasteners. 4. A valve according to claim 1, wherein the locking means is formed by at least one key received in a keyway inside of the cap, with said key resting at the same time on a flat portion of the pivot shaft. 5. A valve according to claim 1, wherein the cap lid is secured on the cap by fastening screws. 6. A valve according to claim 1, wherein the working surfaces are formed by a multi-surfaced part manufactured in one piece with the cap lid. 7. A valve according to claim 1, wherein a flat gasket ring is provided between the cap and the cap lid. 8. A valve according to claim 1, wherein the locking means includes an axially elongate locking member which is nonrotatably engaged with the pivot shaft and is positioned inside of the cap. 9. A valve according to claim 8, wherein the cap lid is nonrotatably secured to the cap, and the locking member is nonrotatably secured to one of said cap and cap lid.