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51. 发明专利

JP2001281394A VALVE AND NUCLEAR POWER PLANT USING IT 失效
公开(公告)号：JP2001281394A
公开(公告)日：2001-10-10
申请号：JP2000095219
申请日：2000-03-29
申请人： HITACHI LTD
发明人： CHIKAZAKI MITSUO , KUNIYA JIRO , KIYOTOKI YOSHIHISA , KATO TAKAHIKO , CHIBA YOSHITERU
IPC分类号： G21D1/00 , B23K20/00 , B23K103/18 , C22C19/03 , C22C19/07 , C22C38/00 , F16K3/12 , F16K15/03 , F22B1/16
摘要： PROBLEM TO BE SOLVED: To provide a valve excellent in corrosion resistance, erosion resistance and maintainability and a nuclear power plant using it. SOLUTION: This valve is characterized by bonding a corrosion resisting and wear resisting Co-base alloy, Ni-base alloy or Fe-base alloy having an Fe base part and an eutectic carbide having a particle size of 30 μm or smaller to a sliding part. This valve is used for an apparatus such as nuclear power plant or the like.

52. 发明专利

JP2000273573A CORROSION RESISTANT AND WEAR RESISTANT ALLOY AND APPARATUS USING THE ALLOY 失效
公开(公告)号：JP2000273573A
公开(公告)日：2000-10-03
申请号：JP8307799
申请日：1999-03-26
申请人： HITACHI LTD , HITACHI KYOWA ENG CO LTD
发明人： KIYOTOKI YOSHIHISA , CHIBA YOSHITERU , KUMAGAI MAKOTO , OGAWA SUKEHIRO , SAKAMOTO AKIRA , ONAKA NORIYUKI , SHINOHARA HIROYUKI
IPC分类号： G21D1/00 , C22C32/00 , C22C38/00 , F16K25/04
摘要： PROBLEM TO BE SOLVED: To suppress the corrosion of eutectic carbides of a Co base alloy (so with Ni base and Fe base alloys) used for the sliding part of an apparatus and a valve seat which have been the cause of increasing the amt. of radiation in a nuclear power plant. SOLUTION: A Co base alloy (so with Ni base and Fe base alloys) used for the sliding part of an apparatus and the valve seat of a valve is subjected to plastic working, by which, in eutectic carbides and the base material part of a cast structure composing the Co base alloy (so with Ni base and Fe base alloys), the eutectic carbides are spheroidized and granulated, so that the corrosion of the eutectic carbides can be limited to the surface, and the corrosion is stopped to the limited range of the surface. Therefore, the corrosion is suppressed, the suppression of the frequency of the disassembly and inspection is made possible, furthermore, in the Co base alloy, by the suppression of the amt. to be corroded, the amt. of Co to be eluted reduces, and the amt. of Co brought into a reactor vessel can also be suppressed.

53. 发明专利

JP2000104844A AUTOMATIC CONTROL VALVE AND PLANT EQUIPMENT 失效
公开(公告)号：JP2000104844A
公开(公告)日：2000-04-11
申请号：JP27706998
申请日：1998-09-30
申请人： HITACHI LTD , NIGATA MASONEILAN CO LTD
发明人： SHINOHARA HIROYUKI , KIYOTOKI YOSHIHISA , JITSUMATSU TAKAYOSHI , USUDA MITSUO
IPC分类号： F16K25/00 , F16K1/36
摘要： PROBLEM TO BE SOLVED: To provide an automatic control valve provided with a means capable of improving control performance of the automatic control valve by suppressing wear due to sliding of an inside surface of a cage and a plug or a valve element, suppressing lowering of control performance of a plant by improving sealing performance of the inside surface of the cage and the plug or the valve element, improving operation performance of the plant, lengthening a disassembling and inspecting period of the automatic control valve and improving maintenance performance of the plant. SOLUTION: In an automatic control valve in which a plug or a valve element 2 is provided with a seal ring 4 sliding with an inside surface of a cage 3, slides, being guided by the inside surface of the cage 3, adjusts an opening for flow control of the cage 3 and controls flow rate of fluid flowing within a valve box, the inside surface of the cage 3 is coated with ceramics CrN and Ni-resist (austenitic nodular graphite cast iron) is used as the seal ring 4.

54. 发明专利

JPH11173444A SPRING TYPE RELIEF VALVE AND EXHAUST FACILITY EQUIPPED THEREWITH 失效
公开(公告)号：JPH11173444A
公开(公告)日：1999-06-29
申请号：JP34252597
申请日：1997-12-12
申请人： HITACHI LTD
发明人： SHINOHARA HIROYUKI , KIYOTOKI YOSHIHISA , KUMAGAI MAKOTO , OGAWA SUKEHIRO
IPC分类号： F16K17/04
摘要： PROBLEM TO BE SOLVED: To provide a relief valve which does not produce the chattering of a valve even through the outlet pressure of the spring type relief valve becomes close to an inlet fluid critical pressure ratio to an inlet pressure. SOLUTION: This spring type relief valve has a structure that the upper part of the valve element 3 of the spring type relief valve is independent from the pressure of a valve outlet 26, thereby the outlet pressure of the relief valve and the inside of a back pressure chamber 25 in the upper part of the valve element 3 can prevent from setting to equivalent pressure, and further, for suppressing the increase of pressure in the upper part of the valve element 3, pressure in the inside of the back pressure 25 in the upper part of the valve element 3 is lowered by ejector effect which utilizes blowout from a valve seat 5 part and communicating holes 11, 12 so as to be retained to sufficient lower pressure than outlet pressure thereby, even through outlet pressure is increased, the chattering of the valve element 3 can be suppressed.

55. 发明专利

JPH1026253A Y TYPE GLOVE VALVE HAVING AIR CYLINDER 失效
公开(公告)号：JPH1026253A
公开(公告)日：1998-01-27
申请号：JP18214896
申请日：1996-07-11
申请人： HITACHI LTD
发明人： KIYOTOKI YOSHIHISA , SAKAMOTO AKIRA , KUMAGAI MAKOTO , OGAWA SUKEHIRO
IPC分类号： G21D1/00 , F16K17/04 , F16K31/12
摘要： PROBLEM TO BE SOLVED: To make a drive part compact by forming a Y type glove valve which is provided in zero atmosphere which is isolated from outer air and has atmospheric pressure or more and is opened and closed by an air cylinder in such a manner that a ratio of air pressure for operation of the air cylinder to pressure of zero atmosphere becomes a specific value. SOLUTION: A Y type glove valve which is used to shut off steam in a plant for nuclear power generation consists of an intermediate pressure double acting cylinder 1, an oil cylinder 2, and a spring 3 which are arranged in parallel, generates open and close drive force by the intermediate pressure double acting cylinder 1, and adjusts open and close speed by a throttle valve 6 provided in an oil cylinder 2. In this case, a ratio of air pressure for operation which operates the intermediate pressure double acting cylinder 1 to pressure of atmosphere in which the Y type glove valve is provided becomes a reverse number of a ratio of critical pressure of air for operation to all pressure or more. Consequently, it is possible to reduce the total length of a drive part by about 25% and the distance between the drive part and the center of gravity of a bonnet by about 35%, facilitate the mounting and dismounting works, and improve its maintenance property.

56. 发明专利

JPH0989739A PRESSURE TESTING METHOD AND LOAD CONTROLLER OF PRESSURE JIG FOR SAFETY VALVE USED IN METHOD THEREOF 失效
公开(公告)号：JPH0989739A
公开(公告)日：1997-04-04
申请号：JP25054595
申请日：1995-09-28
申请人： HITACHI LTD
发明人： KIYOTOKI YOSHIHISA , SAKAMOTO AKIRA , KUMAGAI MAKOTO
IPC分类号： G01N3/12 , G01M3/28 , G21C13/00
摘要： PROBLEM TO BE SOLVED: To make it possible to perform the pressure tests of pressure containers, pipes, equipment and the like with a safety valve mounted by applying loads on the safety valve stepwise by a plurality of times by a pressure jig for the safety valve in accordance with the pressure increase in the object of the pressure test for the pressure container and the like. SOLUTION: An oil cylinder 42 is supported through a supporting rod 41 and arranged in series with a valve rod 3 of a safety valve 20. An oil pump 45 and an automatic operation valve 47 are arranged in parallel at the upstream side of the oil cylinder 42 and controlled with a controller 48. The controller 48 constitutes a load control means and outputs the control command signals, by which loads for pressure resistance are applied to the safety valve 20 stepwise in a plurality of times in accordance with the pressure increase in the object of the pressure test based on the detected pressure value of the pressure container or the like detected with a pressure detecting sensor 49 in the pressure test and the detected value of a load sensor 43, to the driving mechanism of a pressure jig 40 for the safety valve. Thus, the pressure test can be performed with leaktightness performance being maintained without generating excessive stress in the valve body part of the safety valve 20.

57. 发明专利

JPS61186898A WASTE-HEAT RECOVERY UTILIZING DEVICE FOR HEAVY-WATER MODERATION TYPE NUCLEAR POWER PLANT 失效
公开(公告)号：JPS61186898A
公开(公告)日：1986-08-20
申请号：JP2628285
申请日：1985-02-15
申请人： HITACHI LTD
发明人： KIYOTOKI YOSHIHISA , MATSUO TAKESHI , HIRABAYASHI KENTARO
IPC分类号： G21D9/00

58. 发明专利

JPS60177297A CORE SPRAY DEVICE 失效
公开(公告)号：JPS60177297A
公开(公告)日：1985-09-11
申请号：JP3239584
申请日：1984-02-24
申请人： HITACHI LTD
发明人： KODAMA YUTAKA , KIYOTOKI YOSHIHISA
IPC分类号： G21C15/18

59. 发明专利

JPS60147696A RECIRCULATING PIPING SYSTEM FOR COOLANT OF NUCLEAR POWER PLANT 失效
公开(公告)号：JPS60147696A
公开(公告)日：1985-08-03
申请号：JP346184
申请日：1984-01-13
申请人： HITACHI LTD
发明人： KIYOTOKI YOSHIHISA , SHIRAISHI TADASHI
IPC分类号： G21C15/22

60. 发明专利

JPS5895294A VENT DEVICE OF HEAT EXCHANGER IN RESIDUAL HEAT REMOVABLE SYSTEM 失效
公开(公告)号：JPS5895294A
公开(公告)日：1983-06-06
申请号：JP19285881
申请日：1981-12-02
申请人： HITACHI LTD
发明人： KIYOTOKI YOSHIHISA
IPC分类号： F22D7/04 , G21C15/18 , G21D1/00

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