Patent number: 7780143
Abstract: An object is to provide a gate valve capable of preventing operational deficiencies caused by particulate materials accumulating in a valve box, thus providing superior sealing properties and high durability, having a simple structure, and allowing inspection and maintenance to be performed easily.
Type:
Grant
Filed:
November 29, 2007
Date of Patent:
August 24, 2010
Assignees:
Mitsubishi Heavy Industries, Ltd., Hirata Valve Industry Co., Ltd., Clean Coal Power R&D Co., Ltd., Hokkaido Electric Power Co., Incorporated, Tohoku Electric Power Co., Inc., The Tokyo Electric Power Co., Inc., Chubu Electric Power Co., Inc., Hokuriku Electric Power Co., The Kansai Electric Power Co., Inc., The Chugoku Electric Power Co., Inc., Shikoku Electric Power Co., Inc., Kyushu Electric Power Co., Inc., Electric Power Development Co., Ltd., Central Research Institute of Electric Power Industry
Inventors:
Yasunari Shibata, Yoshinori Koyama, Soken Takase, Taizo Hoshino, Shuji Kameyama, Yasuhiro Suzuki, Yoshihiko Horie, Hitoshi Terada, Hirofumi Yamada
Publication number: 20090140195
Abstract: An object is to provide a gate valve capable of preventing operational deficiencies caused by particulate materials accumulating in a valve box, thus providing superior sealing properties and high durability, having a simple structure, and allowing inspection and maintenance to be performed easily.
Type:
Application
Filed:
November 29, 2007
Publication date:
June 4, 2009
Applicants:
MITSUBISHI HEAVY INDUSTRIES, LTD., HIRATA VALVE INDUSTRY CO., LTD., Clean Coal Power R&D Co., LTD., Hokkaido Electric Power Company, Incorporated, Tohoku Electric Power Co., Inc., THE TOKYO ELECTRIC POWER COMPANY, INCORPORATED, CHUBU Electric Power Co., Inc., HOKURIKU ELECTRIC POWER COMPANY, THE KANSAI ELECTRIC POWER CO., INC., THE CHUGOKU ELECTRIC POWER CO., INC., SHIKOKU ELECTRIC POWER CO., INC., KYUSHU ELECTRIC POWER CO., INC., ELECTRIC POWER DEVELOPMENT CO., LTD., Central Research Institute of Electric Power Industry
Inventors:
Yasunari Shibata, Yoshinori Koyama, Soken Takase, Taizo Hoshino, Shuji Kameyama, Yasuhiro Suzuki, Yoshihiko Horie, Hitoshi Terada, Hirofumi Yamada