Abstract: The bath (4) is arranged the supply reservoir (5) for the liquid (3), in which the reaction flask to be heated or cooled can be immersed. The heating or cooling device (8) is arranged on the bottom of the supply reservoir (5). The liquid (3) is delivered with an immersion pump (19) through a feed pipe (6) and an opening (18) in the bottom of the bath (4). The level of the liquid in the bath (4) can be adjusted with the aid of a slider (11). The liquid flows back into the supply reservoir (5) over an overflow (7). When the pump (19) is switched off, the liquid (3) in the bath (4) flows independently back into the supply reservoir (5).

Abstract: A release mechanism for opening a valve of a fire extinguishing installation by means of a linearly movable release element, such as a release plunger or release pin upon releasing a pre-stressed helical spring. At one end of the helical spring there is arranged a movable ball pressure plate. Between this ball pressure plate and a further fixedly arranged ball plate there are arranged balls or spherical elements. A loading pin provided at the movable ball pressure plate retains the helical spring under torsional stress and the movable ball pressure plate in such an angular position that the balls of both ball pressure plates can be retained at a starting distance. Upon electromagnetic release of the loading pin and return rotation of the helical spring the movable ball pressure plate rotates such that the spring can be axially relaxed or load-relieved and the release plunger or the like presses upon the release element of the valve and opens the latter.