Abstract: A gate valve having two wedge-shaped disks that are suspended on a shaft and have sealing surfaces. The disks form an angle of 2.degree.-10.degree. to the shaft. The mutually facing sides of the disks are supported on a non-resilient ring with conical or spherical faces that rest against corresponding mating surfaces. The ring is positioned at the level of the sealing surfaces. The conical faces, or the secants of the spherical segment that form the conical faces, are at an angle of 15.degree.-50.degree. to the longitudinal axis of the shaft.

Abstract: An armature has a closure that can be displaced along an ascending spindle in a housing. The spindle is connected by means of a spindle sleeve accommodated in the valve housing and a transition bushing fastened to the spindle sleeve with an electric-motor adjusting mechanism. A stroke-limiting nut is screwed onto the spindle. There are an intermediate cover and a spring element between the transition bushing and the spindle sleeve. The transition bushing and the intermediate cover can be displaced along the spindle.