| 摘要 |
A water heating system has a hot water flow to a radiator branch and a domestic water heating branch. The return lines from these two branches flow to the main return line through a motor operated valve which comprises two coaxial valve seats, and a valve closure for each valve seat. The motor is connected to the closures through a common valve rod. The two closures are between the two valve seats. The main return line connects to the body between the two seats. The branch return lines each connect on the opposite side of a respective valve seat.
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