| 摘要 |
PURPOSE:To adjust surely the pressure of a reducing valve and to improve the safety by energizing a valve body in the direction, where the valve body goes away from a valve seat, and displacing the valve body against the spring force of a multiple spring in the direction where the valve body approaches the valve seat. CONSTITUTION:When air is discharged by inhalation and the pressure in a pressure chamber 89 is reduced, a valve body 82 is displaced in the direction, where the valve body 82 goes away from a valve seat 80, by double springs 88 and 88a, and a space 94 is generated between the valve seat 80 and one end part of the valve body 82, and high-pressure air in a valve chest 76 has the pressure reduced and is flowed into a flow passage 83. Flowed-in air is led to a air tube 7a through the pressure chamber 89 and a flow passage 90. When the pressure in the pressure chamber 89 rises by this flowing, the valve body 82 is displaced in the direction, where the valve body approaches the valve seat 80, against the spring force of double springs 88 and 88a to keep the airtight state. Even if one spring is faulty, the other is operated to supply a gas for inhalation continuously; and therefore, the safety is improved considerably by this double structure of the outside sping 88 and the inside spring 88a. |
