| 摘要 |
<p>PRESSURE CONTROL VALVE Abstract A pressure control valve (1) comprises a housing (2) defining a flow path (P) for a fluid between an inlet (3) and an outlet (4); a hollow plug (5) for the fluid, movable between a closed position (C), in which the plug (5) is coupled with a closing washer (27) for interrupting the flow of fluid, and an open position (A) to enable the fluid to pass; a counteracting spring (8) exerting an opening force (FA) for pushing the plug (5) to the open position (A), the plug (5) and the spring (8) being configured in such a manner that the closed position (C) is reached at a set limit pressure value (VL) of the fluid downstream; the plug (5) comprises an enlarged portion (10) that is suitable for receiving from the fluid downstream a closing force (Fc) which counteracts the opening force (FA) and acts towards the closed position (C); the enlarged portion (10) has a transverse external dimension equal to a first value (DI) and the plug (5) comprises an intermediate portion (11) that is slidable on guiding and sealing means (12) and having an external transverse dimension that is equal to a second value (D2) less than the first value (DI). 2a 5a L 8 ~ 14 60 2b pA 4 Fig. 1 53 7 Sb 56 Fig. 2</p> |
