| 摘要 |
<p>There is described a device for reducing the delivery pressure of a combustible gas, particularly for systems supplying gas to internal combustion engines for automotive vehicles, comprising a valve seat (5) positioned in a gas flow tube (2) formed in the body (1a) of the reducer, between an inlet section (3) and an outlet section (4), a diaphragm-operated plug element (6) associated with said valve seat (5) and movable along a predetermined axial direction (X) for the purpose of opening and closing the seat (5), a spring device (9) acting on the to diaphragm to subject the latter to a predetermined resilient load, an actuator rod (11) connected for operation to the plug (6) and to the diaphragm, a pressure compensator element (12) which is fixed to the plug (6) upstream of the valve seat with respect to the direction of flow, and which is axially extensible along that direction as a result of the movement of said plug (6) relative to the valve seat (5). The compensator element (12) comprises a tubular body shaped in the form of a bellows, internally hollow and extending axially between opposite axial ends, one of which is connected to the plug (6) while the other is connected to a stationary structure of the reducer, the inner cavity (13) of the tubular body being sealed to separate it from the outside of the body, a predetermined pressure being created in the cavity (13).</p> |
