| 摘要 |
A device for automatic closure of control valves in separable connection units for flexible pipes is described. The device comprises, for every sector (6-7) of the control valve (5) upstream of the direction of the fluid flow, a slidable body (13) operating on said valve sector (6-7) to cause closing and opening rotation thereof, elastic means (17) housed within a first chamber (14) to activate said sliding body (13) in a direction suitable to cause the closing rotation of said valve sector (6-7), a braking fluid housed in a second chamber (18) to brake the movement of said sliding body (13) in the closing direction of said valve sector (6-7) and fluid dynamic communication means (19, 20, 21) between said chambers (14, 18) to permit the controlled transfer of said braking fluid from the second chamber (18) to the first chamber (14) during the movement of said sliding body (14) in the direction of closure of said valve sector (6-7). The aforesaid fluid dynamic communication means (19, 20, 21) comprise a passage duct (19) with an enlarged part (20) and a cartridge inserted in said enlarged part (20) having a grooved part (23) with external grooves (24) of variable length. |
