| 摘要 |
<p>A fluid flow control valve (1a,1b) with integrated pneumatic actuation, comprising a valve body (2a,2b) which forms, inside it, a passage chamber (30a,30b) for a fluid which is connected to an intake port (3a,3b) and a delivery port (4a,4b). A sealing region (5a,5b) is formed inside the passage chamber (30a,30b), between the intake port and the delivery port, and can be engaged by the head (6a,6b) of a pneumatically actuated flow control element (7a,7b) which can move on command along an actuation path (8a,8b) in order to pass from an open position, in which the head (6a,6b) is disengaged and spaced from the sealing region, to a closed position, in which the head (6a,6b) engages the sealing region. In the flow control element there is a compensation chamber (9a,9b) which is connected in terms of pressure to the passage chamber (30a,30b), and in the compensation chamber there are regions (10a,10b, 11a,11b) for applying the pressure of the fluid which are adapted to convert the pressure into a contrasting force which is parallel to the actuation path (8a,8b) of the flow control element (7a,7b) and is orientated in the opposite direction with respect to the force that is parallel to the actuation path and is generated by the pressure of the fluid on the side of the head (6a,6b) of the flow control element (7a,7b) that is directed toward the sealing region (5a,5b). <IMAGE></p> |
