US Patent 10227898 Multi-valve steam valve and steam turbine

A multi-valve-type steam valve provided with a plurality of control valves widening a flow path as valve bodies are gradually separated from valve seats by valve shafts being driven in one direction and allowing steam to flow in by allowing the plurality of control valves to reach an open state in order, the multi-valve-type steam valve being configured such that at least the control valve reaching the open state first among the plurality of control valves have a smaller steam inflow amount during the driving in the one direction from a closed state than the other control valves.