Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Heavy Industries Limited

Tomoshige Takata

Kensuke Futahashi

Katsuhisa Hamada

Hiroshi Sato

Keisuke Matsuyama

Tomoyuki Onishi

Takumi Matsumura

Nobuyuki Hori

Takahiro Ota

Hiroshi Kanasaki

Atsunori Mori

Takaharu Maeguchi

Toshinari Nishimura

Shoichi Okawara

Tomoshi Yamasaki

Hideki Madokoro

A main steam valve includes a cylindrical guide centered about an O-axis, a valve body disposed inside the guide so as to be slidable in the O-axis direction, a valve shaft on which the valve body moves in the O-axis direction between open and closed positions, and a casing having a flow path and a valve seat formed on an inner surface thereof. The flow path guides out a fluid guided into the casing from the inflow direction along the O-axis direction. The valve body abuts against the valve seat when the valve body is in the closed position. A valve chamber, formed in the casing, has a baffle plate provided in a region between an outer circumferential surface of the guide and an inner surface of the casing. The baffle plate interrupts swirling vortex flow with spiral vortex core extending in the circumferential direction of the O-axis of the guide.

Main steam valve and steam turbine

Provided is a steam valve () equipped with: a stop valve () capable of stopping/releasing the flow of steam when driven so as to open/close; an governing valve () that is provided coaxially in the interior of the stop valve (), and that controls the flow volume of the steam when driven to open/close in the same direction as the opening/closing of the stop valve (); and a first guide part () that is provided between the stop valve () and the governing valve () so as to separate the stop valve and the governing valve in the radial direction, and that guides at least the governing valve in the opening/closing direction.

Steam valve and steam turbine

A condition setting process of determining peening conditions for water jet peening on a peening target object, an analysis process of analyzing a jet when a liquid is jetted from a nozzle model to a peening target object model and obtaining a void rate that is a volume rate of air bubbles contained in a unit volume of the liquid and a collapse rate that is a volume of the air bubbles collapsing in a unit time in the unit volume of the liquid in each position on a surface of the peening target object model, a shock pressure correlation value calculation process of obtaining a shock pressure correlation value that is a product of the void rate and the collapse rate in each position, and a range calculation process of obtaining an effective processing range in which the shock pressure correlation value on the surface of the peening target object model is greater than a predetermined value, based on the shock pressure correlation value in each position.

Method of pre-evaluating water jet peening, recording medium having program recorded thereon to execute the method, device for executing the method, and water jet peening method

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Tokyo, Japan

Tomoshige Takata