| 摘要 |
PROBLEM TO BE SOLVED: To provide a steam valve which cuts off the steam to a steam turbine or controls the flow rate of steam and is free from such deficiency that steam valves require a large amount of space for their drive mechanisms because a stop valve and a spill valve are required to be separated from each other when operated and causes some problems in operation, maintenance and inspection, and integral type steam valves suffer from a large amount of pressure loss because a stop valve rod is arranged in a steam passage. SOLUTION: In the steam valve relating to the present invention, the stop valve and the spill valve are provided so as to be of integral structure with the steam valve, and the base end section of the steam valve is fixed to both of the two valves in their axial direction and has hollow structure which allows one of them to be inserted into the other one, and a drive mechanism is also provided to open and close the inlet of the steam passage by operating both of the valves which are connected to the base end section which are operated by the valve rod, the tip of which is projected outside from the same hole of a valve chamber. By this constitution, the tip sections of both valve rods can be managed to be projected outside from the valve chamber through the same hole, and the drive mechanism to activate both valves can be arranged at the same position above the valve chamber. This leads to cost reduction, the trend toward the compaction of the steam valve and the reduction of pressure loss in steam, which can improve maintenance ability and space saving.
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