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1. 发明专利

JP2001165812A SAFETY VALVE TEST METHOD AND SAFETY VALVE TEST APPARATUS 失效
公开(公告)号：JP2001165812A
公开(公告)日：2001-06-22
申请号：JP35332099
申请日：1999-12-13
申请人： HITACHI LTD , OKANO VALVE MFG CO
发明人： OGAWA SUKEHIRO , TAKESHIMA KIKUO , SAKAMOTO AKIRA , HAMADA NOBUYOSHI
IPC分类号： G01M13/00
摘要： PROBLEM TO BE SOLVED: To provide a safety valve test apparatus and a safe valve test method in which an operation test of a safety valve can be correctly carried out even when the capacity of an accumulator of a test facility is insufficient for the relief pressure of the safety valve. SOLUTION: A valve stem 23 is forcibly pulled up by an auxiliary operating device 3, the valve lifting pressure and the valve inlet equivalent pressure are obtained based on the lift, the valve inlet pressure and the internal pressure of the auxiliary operating device 3 during the operating test from the output of each measuring unit, and compared with the verification test result and the nominal relief pressure determining pressure of a model valve. It can be thus confirmed that the operating characteristic of the safety valve subjected to the operation test is equivalent to that of the model valve subjected to the verification test, and complied with the standards on the lift.

2. 发明专利

JP2001099087A PUMP FLOW CONTROL DEVICE 失效
公开(公告)号：JP2001099087A
公开(公告)日：2001-04-10
申请号：JP27404599
申请日：1999-09-28
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NAGAI NOBUHIRO , WATANABE YASUO , NONAKA MOTOMICHI , SAKAMOTO AKIRA
IPC分类号： G05B11/18 , F04B49/06 , F04D15/00
摘要： PROBLEM TO BE SOLVED: To fully use the pump capacity, to lower the number of times of operation and stop, and select a pump to be operated in response to the plant condition. SOLUTION: A number-of-pump control unit of a control device for controlling the flow of plural pumps having a different capacity is provided with a number of pump changeover determining unit 20 for computing the controllable flow range on the basis of the Q-H characteristic 18 per each pump and all pump heads 19 in real time and for computing a number of operated pump pattern table for starting and stopping the pump when a pump, which can not be operated, is detected, and a circuit 21 for selecting a pump to be operated or stopped. The controllable flow range with the real number of operated pump pattern is obtained on the basis of the real number of operated pump pattern and the computed controllable flow range per each pump, and furthermore, controllable flow range with the real upper (restarting) or the lower (stopping) number of operated pump pattern is obtained on the basis of the computed number of operated pump pattern table and the controllable flow range per each pump, and restarting and stop of the pump is determined on the basis of results of these computing, and a pump to be operated or stopped is selected.

3. 发明专利

JPH10228322A METHOD AND DEVICE FOR CONTROLLING FLOW RATE 失效
公开(公告)号：JPH10228322A
公开(公告)日：1998-08-25
申请号：JP3053997
申请日：1997-02-14
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SAKAMOTO AKIRA , WATANABE YASUO
IPC分类号： G05D7/06
摘要： PROBLEM TO BE SOLVED: To attain stable control by suppressing the occurrence of cavitation at the time of arranging plural flow rate control valves in series on one pipe and controlling a flow rate by distributing reduced pressure levels to respective valves. SOLUTION: In the case of arranging plural flow rate control valves 3, 5 in series on one pipe 1 and automatically controlling the valve apertures of respective valves 3, 5, a single valve aperture target value at the time of supposing that a fluid flow rate in the pipe 1 is controlled only by one flow rate control valve is found out, the target apertures of respective corresponding valves 3, 5 in which respective cavitation coefficients of the valves 3, 5 are the same and the synthetic loss coefficient of the valves 3, 5 is the same as the loss coefficient of the supposed flow rate adjusting valve are found out from the single valve aperture target value (14, 15) and the valve apertures 16, 17 of respective valves 3, 5 are controlled so as to coincide with the target apertures of the corresponding valves 3, 5 (12, 13).

4. 发明专利

JPH086645A FLOW RATE CONTROLLER 失效
公开(公告)号：JPH086645A
公开(公告)日：1996-01-12
申请号：JP14042094
申请日：1994-06-22
申请人： HITACHI LTD , OKANO VALVE SEIZO KK
发明人： KIYOTOKI YOSHIHISA , SAKAMOTO AKIRA , JITSUMATSU TAKAYOSHI , KIKUTA KAORU
IPC分类号： G21C15/24 , F16K3/24 , G05D7/06
摘要： PURPOSE:To effectively suppress cavitation and erosion even in an operation area wherein differential pressure or a high flow velocity is generated transiently and the cavitation and erosion are feared. CONSTITUTION:In the fluid flow passage from a fluid intake 1a to a fluid outlet 1b formed in a body 1, a 1st contraction part formed of an orifice 15 and a cut groove 20, a 1nd contraction part formed of the diameter part 16 of the center part of a sheet 13 and a disk 30, and a 3rd contraction part in labyrinth structure of a multistage groove 31 formed on the disk 30 are provided; and the pressure of fluid is reduced in stages through the 1st, 2nd, and 3rd contraction parts.

5. 发明专利

JPH0587270A VALVE ELEMENT VIBRATION CONTROL STRUCTURE IN Y-GLOBE VALVE 失效
公开(公告)号：JPH0587270A
公开(公告)日：1993-04-06
申请号：JP25085091
申请日：1991-09-30
申请人： HITACHI LTD
发明人： TAKESHIMA KIKUO , KUMAGAI MAKOTO , SAKAMOTO AKIRA
IPC分类号： F16K47/02 , G21D1/00
摘要： PURPOSE:To control the vibration due to a fluid impact by setting a guide, guiding a valve element, down to a wing guide with a widening part, one part is more widened than the other part in a contact range along the outer periphery of this valve element. CONSTITUTION:A wing guide 3 widens a contact range within the extent of a tangent 8 on a peripheral surface between a guide and a valve element 2 at a time when the guide is widened, and a stellite overlay is applied to a surface opposed to the valve element of this widened wing guide 3, thereby eliminating any possible wear. Thus, since a guide surface, existing in the more flowing side than the valve element 2 and guiding a movement of this element 2, is widened along the outer periphery of the valve element 2, an area at a time when a fluid directly collides with the valve element 2 becomes lessened, the magnitude of vibration in the valve element 2 is made smaller. In addition, the stellite overlay is applied to the guide surface at the side of the valve element 2 of the wing guide 3, through which wear or abrasion due to an impact caused by a vibration in the valve element can be almost brought to nothing.

6. 发明专利

JPS62276603A THREE-POSITION CONTROL DEVICE WITH BLIND SECTOR WIDTH 失效
公开(公告)号：JPS62276603A
公开(公告)日：1987-12-01
申请号：JP11926586
申请日：1986-05-26
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SAKAMOTO AKIRA
IPC分类号： G05B11/18
摘要： PURPOSE:To suppress the narrowness of an operation enable range at its minimum by adding an objective value converter for forming a new objective value while considering the error of a manipulated variable feedback value. CONSTITUTION:An electric valve 8 is connected to execute flow rate control or pressure control and its aperture objective value 9 is inputted to an objective value converter 1. The converter 1 converts the objective value 9 into an aperture controller setting value 4 in accordance with a prescribed formula and outputs the converted value to an aperture controller 2. The aperture controller 2 supplies a control output to an aperture controlling motor 3 based on a deviation between a real aperture 5 of the electric value 8 and the setting value 4. The controller 2 is constituted of an electric positioner having a blind sector input element in its input operation part. Since the set value of the electric positioner is expanded to a span considering a blind sector width and a manipulated variable feedback input value error, the span of a control manipulated variable can be secured in its maximum.

7. 发明专利

JP2003207059A VALVE AND ITS MANUFACTURING METHOD 审中-公开
公开(公告)号：JP2003207059A
公开(公告)日：2003-07-25
申请号：JP2002004034
申请日：2002-01-11
申请人： HITACHI LTD
发明人： CHIKAZAKI MITSUO , MATSUSHITA SHIZUO , KUNIYA JIRO , KIYOTOKI YOSHIHISA , TAKESHIMA KIKUO , SAKAMOTO AKIRA , CHIBA YOSHITERU
IPC分类号： G21D1/00 , B22F5/00 , B22F7/06 , C22C1/05 , C22C19/05 , C22C38/12 , C22C38/32 , C22C38/34 , F16K3/12 , F16K25/00
摘要： PROBLEM TO BE SOLVED: To provide a valve having superior wear resistance and seizure resistance without containing cobalt. SOLUTION: Valve seats 4, 5 of a valve element 2 and a valve box 3 are formed of a nickel group alloy in which small-size silicide particles or boronide particles are finely dispersed. Liquid phase diffusion bonding is applied between the valve seat and the valve element or the valve box via an insert material formed of a low-melting-point nickel group alloy. COPYRIGHT: (C)2003,JPO

8. 发明专利

JP2002146486A CORROSION RESISTANT AND WEAR RESISTANT ALLOY AND APPARATUS USING THE SAME 审中-公开
公开(公告)号：JP2002146486A
公开(公告)日：2002-05-22
申请号：JP2001235714
申请日：2001-08-03
申请人： HITACHI LTD , HITACHI KYOWA ENG CO LTD
发明人： KIYOTOKI YOSHIHISA , CHIBA YOSHITERU , KUMAGAI MAKOTO , OGAWA SUKEHIRO , SAKAMOTO AKIRA , SHINOHARA HIROYUKI
IPC分类号： C21D7/13 , C21D8/00 , C22C19/00 , C22C19/05 , C22C19/07 , C22C38/00 , C22C38/14 , C22C38/34 , C22C38/44 , C22C38/58 , C22F1/00 , C22F1/10 , F01L3/02 , F04B53/00
摘要： PROBLEM TO BE SOLVED: To provide a corrosion resistant and wear resistant alloy in which the chain of the corrosion of eutectic carbides composing a cobalt based, nickel based or iron based alloy used for the sliding part and valve seat of apparatus in a dissolved oxygen atmosphere. SOLUTION: In this corrosion resistant and wear resistant alloy, an intermediate stock obtained by casting a stock selected from a cobalt base with Cr and/or W added, a nickel base with Fe and/or Cr added or an iron base with Cr and/or Ni added into an ingot or a slab is subjected to hot plastic working at the solidus temperature or lower. In the structure composed of network eutectic carbides in the intermediate stock and a base material part surrounded thereby, the eutectic carbides are formed to plural granular or lumpy ones into a noncontinuous distribution. Its friction coefficient is controlled to 0.1 to 0.5. Its Vickers hardness in a state where aging treatment is not performed is controlled to 300 to 600 Hv.

9. 发明专利

JPH08305444A FLOW RATE CONTROLLER 失效
公开(公告)号：JPH08305444A
公开(公告)日：1996-11-22
申请号：JP11179395
申请日：1995-05-10
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SAKAMOTO AKIRA , WATANABE YASUO , KOIKE MASAYUKI , NAKAMURA MITSUAKI
IPC分类号： G05B11/36 , G05D7/06
摘要： PURPOSE: To provide the flow rate controller for which any valve aperture detector is not required and the accuracy and stability of flow rate control are extremely improved. CONSTITUTION: Concerning the flow rate controller, a valve manipulated variable computing element 5 for calculating a manipulated variable at one time of sampling with PID arithmetic considering a correction loop gain based on flow rate deviation from a target flow rate 11 of a measured flow rate 10 and flow rate control valve aperture/flow rate characteristics, valve operating time computing element 6 for finding the opening or closing command output time of the valve from the manipulated variable 12, and valve opening/closing outputter 9 for outputting the valve opening/closing command are provided inside a controller 4 and the command for opening or closing the valve is outputted to a valve driving device 7 so that a flow rate control valve 2 can be driven.

10. 发明专利

JPH0242501A INSTRUMENTATION CONTROLLER 失效
公开(公告)号：JPH0242501A
公开(公告)日：1990-02-13
申请号：JP19273988
申请日：1988-08-03
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SAKAMOTO AKIRA , KAWAGUCHI TOSHIMI , MIYAMOTO AKIRA
IPC分类号： G05B7/02 , G05B11/32
摘要： PURPOSE:To ensure the stable instrumentation control by adding a PID resetting function so as to cascade-connect a primary loop control system for the plant output value in bumpless while only a secondary control system is working. CONSTITUTION:When a primary control loop is actuated during the operation of a secondary control loop and the deviation is large between the PV (value) 12 and the SV (arithmetic result) 11, the effect of a resetting command 24 is conspicuous. In other words, the deviation is suddenly set at zero when PV 12 >> SV 11 or PV 12

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