Abstract: A twin-nozzle gas switch includes a unitary switch base, a pair of nozzles, a pair of valve members, a pair of cover members, and a pair of control rods. The switch base includes a pair of valve seats, each having a gas regulating section and a gas outlet section, and a tubular conduit connected integrally to the valve seats. Each nozzle is mounted at a respective gas outlet section. Each valve member is mounted rotatably in a respective gas regulating section. Each cover member is mounted at a respective gas regulating section. Each control rod extends through a respective cover member, and is connected to a respective valve member.

Abstract: A gas regulating valve includes a valve housing. A tubular valve member is received in the valve housing, defines a valve space, and is formed with a valve seat. The valve seat defines a valve opening, and divides the valve space into a gas feed portion and a gas supply portion. A valve stem is provided with a valve piece that extends into and that is axially movable relative to the valve member. Rotation of the valve stem results in corresponding rotation of the valve member and further results in translation of the valve piece. Translation of the valve piece toward and away from the valve opening enables the valve piece to respectively reduce and increase amount of gas flowing from the gas feed portion into the gas supply portion through the valve opening.

Abstract: A gas regulating valve includes a valve housing. A tubular valve member is received in the valve housing, defines a valve space, and is formed with a valve seat. The valve seat defines a valve opening, and divides the valve space into a gas feed portion and a gas supply portion. A valve stem is provided with a valve piece that extends into and that is axially movable relative to the valve member. Rotation of the valve stem results in corresponding rotation of the valve member and further results in translation of the valve piece. Translation of the valve piece toward and away from the valve opening enables the valve piece to respectively reduce and increase amount of gas flowing from the gas feed portion into the gas supply portion through the valve opening.