Abstract: A metal bellows is located in a chamber of the housing. A channel connects its inner space with the ambient. The gastight metal bellows ends at a reaction area disk. A pivoting arm with a baffle plate is pivotably mounted at one end to the housing. Its opposite end is coupled to the reaction area disk. Pressurized gas flows out of an outlet nozzle against the baffle plate and into the inner chamber of the housing and acts upon the reaction area disk. The pressure in the inner space of the chamber depends from the distance between the baffle plate of the upwards pivoted pivot arm and the outlet nozzle. This pressure is balanced by the counter-force of the circumferential wall of the metal bellows acting as spring member. Accordingly, the pressure of the fuel gas stored in a gas cylinder is reduced at the gas outlet of the housing to a preset pressure, from which gas outlet the fuel gas is led through a conduit to a gas burner.

Abstract: The apparatus includes a first protection sleeve element having a substantially radially upturned annular end portion, a second protection sleeve element having also a substantially radially upturned end portion and a bellows. The bellows ends at both sides in a neck. A cylinder shaped portion of the first protection sleeve element is surrounded by an envelope part having a cylinder shaped portion and a substantially radially upturned annular end portion. Likewise, a cylinder shaped portion of the second portion sleeve element is surrounded by an envelope part having a cylinder shaped portion and a substantially radially upturned annular end portion. The necks of the bellows are sandwiched between the cylinder shaped portions of the respective envelope parts and the first protection sleeve element and the second protection sleeve element and are welded thereto.

Abstract: The apparatus consists of three single integral sheet metal structures interconnected by weldings. The first structure is the bellows element. The second structure is an integral formed sheet metal part which forms the one flange element and simultaneously the protection sleeve element. The third structure is a further integral formed sheet metal part which forms the other flange element and simultaneously the pipe stub element in which the free end of the protection sleeve element is received. The flange elements are formed in that the sheet metal parts include a first and a second portion, whereby the respective second portions are folded back over the respective first portions and welded thereto.

Abstract: A method of producing a corrugated flexible tube wherein a corrugated profiled strip having multiple corrugations is wound in a helical path such that its edges overlap and then the overlapped edges are tight welded together, preferably by electrical resistance welding, such that every welded corrugation of the resultant corrugated flexible tube is followed by at least one unwelded corrugation.