| 摘要 |
A valvular unit for combined boilers of the type comprising a first circuit for the heating fluid, and a second circuit for the distribution of hot water for domestic use; the valvular unit comprises two ball valves (10, 11) which can be connected by means of a bypass passage (12) in order to allow independent operation of the two circuits of the boiler, and in order to allow them to be connected to a water-distribution network (mains) by means of the same valvular unit. Just one or both valves (10, 11) of the unit include a ball sleeve (trunnion, journal) (19) equipped with an axial passage (20) which can be rotated into a first open position in which the axial passage (29) of the ball (19) is aligned with the main passage (16, 17) of the valve (10) to a closed position, and a second bypass open position which is obtained by bringing about a rotation of the ball sleeve (19) beyond the already mentioned closed position. <IMAGE> |
