Valve assembly for gas cylinder

摘要

Within a housing (3), a gas inlet (4) communicates with a gas outlet (5) through an inlet passage (11), a shut off valve (12) and an outlet passage (13), and a charging port (6) communicates with a discharging port (7) via a bypass passage (14). The outlet passage (13) is provided with a first pressure reducing valve (21) of piston type, a second pressure reducing valve (22) of diaphragm type and a first check valve (31) for retaining residual pressure, in series in the mentioned order. The bypass passage (14) is provided with a second check valve (32) which inhibits a flow from the discharging port (7) to the charging port (6).