WO2016126113A2 - Procédé permettant de commander la détection d'une anomalie d'un système de remplissage/de vidage de réservoir sous pression - Google Patents

Procédé permettant de commander la détection d'une anomalie d'un système de remplissage/de vidage de réservoir sous pression Download PDF

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Publication number
WO2016126113A2
WO2016126113A2 PCT/KR2016/001205 KR2016001205W WO2016126113A2 WO 2016126113 A2 WO2016126113 A2 WO 2016126113A2 KR 2016001205 W KR2016001205 W KR 2016001205W WO 2016126113 A2 WO2016126113 A2 WO 2016126113A2
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WIPO (PCT)
Prior art keywords
level
pressure tank
change
filling
switch
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Ceased
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PCT/KR2016/001205
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English (en)
Korean (ko)
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WO2016126113A3 (fr
Inventor
양재구
양지석
오재욱
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Flowtech Co Ltd
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Flowtech Co Ltd
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Priority claimed from KR1020160013466A external-priority patent/KR101876261B1/ko
Publication of WO2016126113A2 publication Critical patent/WO2016126113A2/fr
Publication of WO2016126113A3 publication Critical patent/WO2016126113A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B9/00—Safety arrangements
    • G05B9/02—Safety arrangements electric
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
    • G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means

Definitions

  • the present invention relates to a method for detecting abnormality of a pressure tank filling / exhaust system, and more particularly, to fill or exhaust gas for controlling the level of a pressure tank used in a piping system such as an expansion tank or a water shock prevention tank.
  • the present invention relates to a method for precisely and reliably controlling the level of a pressure tank by detecting an abnormality of a filling / exhaust system configuration device such as a level transmitter, a level switch, a flow switch, a gas supply device, or an exhaust valve.
  • Each tank is provided with a pressure tank (in the former case, a water shock prevention tank, and in the latter case, an expansion tank).
  • a pressure tank in the former case, a water shock prevention tank, and in the latter case, an expansion tank.
  • the accurate and reliable maintenance of the proper level is to maintain the energy source for the stabilization of the expansion or shock pressure wave
  • the change in the level of the pressure tank means the change of the reference pressure in the piping system as a whole.
  • the piping or equipment of piping system may be damaged, and if the pressure drops and becomes lower than the saturated steam pressure of the liquid, the equipment or piping may be damaged by shock waves when recombining after order separation. It should be controlled so that it is always maintained in the proper level range.
  • This level control of the pressure tank is performed by filling or exhausting a gas such as air or nitrogen in the pressure tank.
  • the water level of the real-time pressure tank 100 is sensed by the level transmitter LT in the water shock prevention device of the open piping system in which the level maintenance of the pressure tank is the target.
  • the controller 400 opens the filling valve S1 to fill gas into the pressure tank 100 from the gas supply device 200 to lower and adjust the water level to an appropriate level.
  • Open (S2) to exhaust the gas from the pressure tank 100 to the outside to raise the water level.
  • the same method according to the expansion and contraction of the piping water in the expansion tank system of the circulation piping system transient piping system having a hot water tank or open circulation tank
  • In-tank level control is performed.
  • (b) and (c) of FIG. 1 differ only in the connection position of the pressure tank, and the rest of the system configuration is the same, so the level control method will be the same.
  • a level transmitter in order to control the water level of the pressure tank, a level transmitter must be provided in the pressure tank.
  • an error or malfunction occurs in the level transmitter.
  • Unnecessary filling or exhausting operations are carried out to change the operating pressure of the system, which results in a failure of the water hammer or expansion control device as well as a change in pressure throughout the piping system, resulting in a water shock prevention device and an expansion control device.
  • level transmitters malfunction by installing multiple level transmitters for precise and reliable water level control of pressure tanks in piping systems requiring high reliability such as district heating and cooling piping systems, liquid transfer systems, and plants.
  • methods to deal with failures or errors have been proposed.
  • the level transmitter has a disadvantage in that failure occurs frequently, the price is high, and the reliability of the measured water level value is low, and the use of a plurality of level transmitters requires a lot of equipment and maintenance costs.
  • Korean Patent No. 10-1069126 of the present applicant further includes a plurality of level switches operated by a contact detection method in case of failure of the level transmitter, the level measurement value of the level transmitter and the on / off of the level switch After comparing the signals to determine whether there is an abnormality in the level transmitter and determining whether the actual pressure tank is rising or falling, the pressure tank for filling or exhausting gas into the pressure tank based on the determination result and the on / off signal of the level switch.
  • Level control methods are known.
  • the registered patent has an advantage in that it is possible to determine whether the water level rises or falls in the actual pressure tank based on the on / off signal of the level switch even when an error occurs in the level transmitter, but only the level transmitter can be checked for abnormality.
  • there is a disadvantage that it is not possible to check the abnormality of the components of the filling and exhaust system, such as level switch, flow switch, gas supply device or exhaust valve.
  • the present invention has been made to solve the problems of the conventional pressure tank filling and exhaust system as described above, whether the filling and exhaust system components, such as level transmitter, level switch, flow switch, gas supply device or exhaust valve
  • the purpose of the present invention is to provide an effective system control method.
  • the present invention for achieving the above object is a pressure tank provided for water shock prevention control or expansion control in the piping system; A level transmitter for measuring the water level of the pressure tank; A plurality of level switches installed at different heights in the pressure tank; An abnormality detection control method of a pressure tank filling / exhaust system including a gas supply device for supplying gas to the pressure tank, the method comprising: filling or exhausting gas into a pressure tank; Detecting a change in level transmitter measurement after initiation of filling or evacuation of the gas; Detecting a change in the ON / OFF signal of the level switch after filling or exhausting gas; Determining whether the level transmitter and the level switch are abnormal on the basis of the change of the level transmitter measured value for the predetermined time and the change result of the ON / OFF signal of the level switch; And controlling filling or exhausting of the pressure tank according to the abnormality determination result.
  • the detecting of the change of the level transmitter measurement value and the detecting of the ON / OFF signal change of the level switch are preferably performed for a predetermined time after filling or exhausting the gas.
  • the level transmitter If there is no change in the measured value of the level transmitter and there is a change in the level switch ON / OFF signal, it is determined that the level transmitter is abnormal and the filling or exhaust of the pressure tank is controlled in accordance with the ON / OFF signal of the level switch. .
  • a level transmitter for measuring the water level of the pressure tank;
  • a plurality of level switches installed at different heights in the pressure tank;
  • a gas supply device for supplying gas to the pressure tank;
  • An exhaust valve installed in the pressure tank to discharge the gas inside the pressure tank to the outside when the water level of the pressure tank is lowered;
  • An abnormality detection control method of a pressure tank filling / exhaust system which includes a flow rate switch provided on the discharge side and an exhaust valve discharge side of the gas supply device and configured to sense a flow rate of gas filled or exhausted into and out of the pressure tank.
  • the detecting of the change of the level transmitter measurement value and the detecting of the ON / OFF signal change of the level switch are preferably performed for a predetermined time after filling or exhausting the gas.
  • the flow switch signal when the flow switch signal is ON when the gas is filled or exhausted, there is a change in the measured value of the level transmitter, and there is a change in the level switch ON / OFF signal, it is determined that both the level transmitter and the level switch are normal.
  • the filling or exhaust of the pressure tank is controlled according to the measured value of the level transmitter.
  • the flow switch signal is ON when the gas is filled or exhausted and there is no change in the measured value of the level transmitter, and there is a change in the level switch ON / OFF signal, it is determined that the level transmitter is abnormal. Control the filling or exhaust of the pressure tank in accordance with the ON / OFF signal.
  • the flow switch signal is in the OFF state and there is a change in the measured value of the level transmitter, or there is a change in the ON / OFF signal of the level switch, it is determined that the flow switch is abnormal. Control the filling or exhaust of the pressure tank in accordance with normal level transmitter readings.
  • a pressure tank provided for water shock prevention control or expansion control in a piping system;
  • a level transmitter for measuring the water level of the pressure tank;
  • a plurality of level switches installed at different heights in the pressure tank;
  • a gas supply device for supplying gas to the pressure tank;
  • An exhaust valve installed in the pressure tank to discharge the gas inside the pressure tank to the outside when the water level of the pressure tank is lowered;
  • An abnormality detection control method of a pressure tank filling / exhaust system including a pressure sensor for sensing a pressure inside a pressure tank, the method comprising: filling or exhausting gas into a pressure tank; Detecting a change in pressure sensor reading after initiation of filling or evacuation of the gas; Detecting a change in level transmitter measurement after initiation of filling or evacuation of the gas; Detecting a change in the ON / OFF signal of the level switch after filling or exhausting gas; Determining whether the level transmitter and the level switch are abnormal based on a change in the measured value of the pressure sensor, a
  • the detecting of the change of the pressure sensor measurement value, the detecting of the change of the level transmitter measurement value, and the detecting of the ON / OFF signal change of the level switch are performed for a predetermined time after filling or exhausting the gas. do.
  • the pressure tank provided for water shock prevention control or expansion control in the piping system;
  • a level transmitter for measuring the water level of the pressure tank;
  • a plurality of level switches installed at different heights in the pressure tank;
  • a gas supply device for supplying gas to the pressure tank;
  • An exhaust valve installed in the pressure tank to discharge the gas inside the pressure tank to the outside when the water level of the pressure tank is lowered;
  • An abnormality detection control method of a pressure tank filling / exhaust system including a pressure sensor for sensing a pressure inside a pressure tank, the method comprising: filling or exhausting gas into a pressure tank; Detecting a change in pressure sensor reading after initiation of filling or evacuation of the gas; Detecting a change in level transmitter measurement after initiation of filling or evacuation of the gas; Detecting a change in the ON / OFF signal of the level switch after filling or exhausting gas; Determining whether the level transmitter and the level switch are abnormal based on a change in the measured value of the pressure sensor,
  • the detecting of the change of the pressure sensor measurement value, the detecting of the change of the level transmitter measurement value, and the detecting of the ON / OFF signal change of the level switch are performed for a predetermined time after filling or exhausting the gas. do.
  • the level transmitter, the level switch, and the pressure Both sensors are determined to be normal and the filling or exhaust of the pressure tank is controlled in accordance with the measured value of the level transmitter.
  • the present invention as described above, it is possible to detect the abnormality of the filling / exhaust system components such as level transmitter, level switch, flow switch, gas supply device or exhaust valve, and to control the pressure tank level precisely and reliably. It is possible to prevent the pressure control of the piping system resulting from the failure of the level transmitter, the level switch, and the like and the safety accident such as the pipe explosion due to the failure.
  • FIG. 1 is a configuration diagram of a piping system having a conventional pressure tank
  • FIG. 2 is a configuration diagram of a pressure tank filling and exhaust system according to a preferred embodiment of the present invention
  • FIG. 3 is a diagram schematically illustrating a level sensing range and an output method of a level transmitter and a level switch
  • FIG. 5 is a diagram illustrating an abnormality determination according to a change in a measured value of a level transmitter and a change in a level switch ON / OFF signal, and a filling or exhaust control method based on the same;
  • FIG. 6 is a flow chart of an abnormality detection and control method of the pressure tank filling and exhaust system according to another preferred embodiment of the present invention.
  • FIG. 7 is a diagram showing an abnormality determination according to a flow switch signal, a change in a measured value of a level transmitter, and a change in a level switch ON / OFF signal and a filling or exhaust control method based on the same;
  • FIG. 8 is a flow chart of an abnormality detection and control method of the pressure tank filling and exhaust system according to another preferred embodiment of the present invention.
  • FIG. 9 is a diagram illustrating an abnormality determination according to a change in a pressure sensor measurement value, a change in a measurement value of a level transmitter, and a change in a level switch ON / OFF signal, and a filling or exhaust control method based on the change.
  • control unit LT level transmitter
  • LS1 First level switch
  • LS2 Second level switch
  • FIG. 2 is a block diagram of a pressure tank 100 filling and exhausting system according to a preferred embodiment of the present invention. As shown, the pressure tank 100 is provided with one level transmitter LT and three level switches LS1, LS2, and LS3.
  • NWL NORD WATER LEVEL
  • NH NORD HIGH
  • NL NORD LOW
  • the level transmitter LT is installed to measure the entire water level of the pressure tank 100, and the level switch is a first level switch LS1 installed at a low level alarm line LA and an appropriate level line. And a third level switch LS2 provided at NWL and a third level switch LS3 provided at high level alarm line HA.
  • a total of three level switches are used, but the present invention is not limited thereto, and a total of two level switches may be used, one for each of the upper limit and the lower limit, or between the upper limit, the upper limit and the center of gravity, the lower limit, the lower limit, and the center of gravity.
  • a total of four level switches may be used, one for each.
  • two level switches may be separately installed to enable level detection even when an error occurs in one level switch.
  • FIG. 3 schematically illustrates a level transmitter LT and a level sensing range and an output method of each level switch LS1, LS2, and LS3.
  • the level transmitter LT is a kind of analog sensor that can be measured over the entire water level (0% to 100%), and the measured value is output as a current value of 4 mA to 20 mA.
  • Each level switch LS1, LS2, LS3 is a kind of digital sensor, and is configured to close the contact by a floating hole when the water level is reached, and outputs an ON / OFF signal.
  • the level transmitter (LT) is a sensor for measuring the water level by a float method or a conductivity measurement method, while real-time precision level measurement is possible, but has a disadvantage of relatively high failure rate and high price.
  • the level switch is a contact type that only knows whether a certain level is reached, so real-time level measurement is impossible, but there is a relatively low failure rate and low cost. Therefore, the present invention uses only one level transmitter LT having a relatively high failure rate and high cost, and uses a plurality of level switches having a low failure rate and low cost to compensate for the shortcomings of the level transmitter LT, and actively utilizes the advantages of the level switch. By utilizing this method, it is possible to provide reliable water level control at low cost.
  • one side of the pressure tank 100 is connected to the gas supply device 200, which selectively includes a gas storage tank (not shown), an air compressor (not shown) or a nitrogen generator to supply gas therein, ,
  • the other side is provided with an exhaust valve (S) for discharging the gas to the outside when the water level in the pressure tank 100 is lowered.
  • a first flow rate switch FS1 for detecting a flow rate of the gas flowing into the pressure tank 100 is installed at the discharge side of the gas supply device 200, and exhausted to the outside at the discharge side of the exhaust valve S. It is preferable that the second flow rate switch FS2 is installed to detect the flow rate of the gas.
  • the pressure tank 100 preferably further includes a pressure sensor PS for detecting a change in the internal pressure.
  • FIG. 4 is a flowchart of a method for detecting and controlling an abnormality of the pressure tank filling / exhaust system according to the present invention, and in FIG. 5, the measured value change of the level transmitter LT and the ON / OFF of the level switches LS1, LS2, and LS3.
  • the abnormality determination and control method according to the OFF signal change is shown. This abnormality determination and control method is performed by the controller 400 shown in FIG.
  • the first step is filling gas into the pressure tank 100 or exhausting the gas to the outside according to the change in the water level of the pressure tank 100 (ST1).
  • ST1 the change in the water level of the pressure tank 100
  • the water level inside the pressure tank 100 changes, and the amount of change increases with time. This change in water level over time causes a change in the measured value of the level transmitter LT and the ON / OFF signal of the level switch.
  • the level transmitter In order to determine whether the measured value of the level transmitter LT changes (that is, whether the level transmitter LT is abnormal) corresponding to the change of the water level, the level transmitter for a predetermined time after the start of filling or exhausting the gas. (LT) The change of the measured value is detected (ST2). At the same time or sequentially, in order to determine whether the level switches LS1, LS2, LS3 operate according to the level change (i.e., whether the level switch is abnormal), for a predetermined period of time after the start of filling or exhausting the gas The ON / FF signal change of the level switches LS1, LS2, and LS3 is sensed (ST3).
  • the predetermined predetermined time is the capacity of the pressure tank 100, the interval between each installed level switch (LS1, LS2, LS3), the gas filling amount or displacement according to the time, the level of water level fluctuation according to the gas filling or displacement
  • the level transmitter LT may be predetermined through experiments at a time interval such that a change may occur in the ON / FF signals of the level switches LT1, LS2, and LS3.
  • the level transmitter LT or the level switch LS1 based on the change result of the level transmitter LT measured for the predetermined time and the change result of the ON / OFF signal of the level switches LS1, LS2 and LS3. And LS2 and LS3 are judged to be abnormal (ST4), and the filling / exhaust is controlled by excluding the level transmitter LT or the level switches LS1, LS2 and LS3 which are abnormally determined according to the abnormality judgment result (ST5). ).
  • the level transmitter LT and the level are changed.
  • the switches LS1, LS2, and LS3 are all determined to be normal, and the filling or exhausting of the pressure tank 100 is controlled in accordance with the measured value of the level transmitter LT. That is, when the measured value of the level transmitter LT reaches the upper limit level, the gas is filled into the pressure tank 100, and when the measured value of the level transmitter LT reaches the lower limit level, the gas is filled into the pressure tank 100. Exhaust to the outside.
  • the level switch LS1, LS2, LS3 or more is determined.
  • the water level is changed and the water level change is detected by the level transmitter LT or the level switches LS1, LS2, and LS3, but there is a change in the measured value of the level transmitter LT.
  • No change in the signals of the level switches LS1, LS2, and LS3 can be inferred that an abnormality has occurred in the level switches LS1, LS2, and LS3.
  • the level switches LS1, LS2, and LS3 are abnormal and an alarm is generated externally, and the level switches LT determined to be normal by excluding the ON / OFF signal of the level switches LS1, LS2 and LS3.
  • the filling or exhaust of the pressure tank 100 is controlled according to the measured value.
  • the filling or exhausting of the pressure tank 100 is controlled according to the ON / OFF signal of the level switches LS1, LS2, and LS3 determined to be normal, except for the measurement value of the level transmitter LT determined to be abnormal.
  • both the level transmitter (LT) and the level switch (LS1, LS2, LS3) are abnormal. It is determined to be present, an external alarm is generated, the system is stopped, and the operation is performed again after maintenance.
  • the signal of the flow rate switch (FS1, FS2) in order to check whether the filling or exhaust of gas is actually being performed (that is, whether the gas is actually in or out of the pressure tank)
  • the method further includes sensing.
  • FIG. 6 illustrates an abnormality detection algorithm of the pressure tank filling / exhaust system including the flow switch signal sensing step.
  • gas is filled or exhausted into the pressure tank (ST10), and the signals of the flow switches FS1 and FS2 are sensed (ST20) to check whether actual filling or exhaust is occurring.
  • the flow rate switches FS1 and FS2 turn on when the fluid passes, and turn off when the fluid does not pass.
  • ST30 a change in the level transmitter measurement value for a predetermined time after the start of filling or exhausting is detected.
  • a change in the level switch ON / OFF signal for a predetermined time after the start of filling or exhausting is detected (ST40).
  • the detected flow switch signals FS1 and FS2 it is possible to determine whether the flow switch, the gas supply device or the exhaust valve is abnormal in addition to the level transmitter LT and the level switches LS1, LS2 and LS3. Specifically, as shown in FIG. 7, when the signals of the flow rate switches FS1 and FS2 are ON when the gas is filled or exhausted, the level transmitter LT and the level switch are shown in FIG. 5 and the same manner as described above. The abnormality of (LS1, LS2, LS3) is determined, and the filling and exhaust control methods are similarly performed accordingly.
  • the flow rate switches FS1 and FS2 When the signal of the flow rate switches FS1 and FS2 is OFF and there is a change in the measured value of the level transmitter LT, and the ON / OFF signal of the level switches LS1, LS2 and LS3 also changes, the flow rate switches FS1 and FS2 ) Is determined as abnormal. Accordingly, an external flow switch abnormal alarm is generated and the filling or exhaust of the pressure tank 100 is controlled according to the normal level transmitter LT measurement value.
  • FIG. 8 is a flowchart illustrating an algorithm for determining whether a system is abnormal by detecting a change in a pressure sensor PS measurement value.
  • FIG. 9 is a measurement value change of a pressure sensor, a change in a measurement value of a level transmitter, and a level switch ON. Determination of abnormality according to the change of the / OFF signal and a method of controlling the filling or exhaust based on the change are plotted.
  • Detecting the change in the measured value of the pressure sensor PS that is, whether the internal pressure of the pressure tank 100 changes, it is possible to determine whether the level transmitter LT and the level switches LS1, LS2, and LS3 are abnormal. In addition, whether the pipeline of the pressure tank 100 is blocked, whether the water is being filled, etc., the current state of the inside of the pressure tank 100 can be grasped more precisely.
  • an abnormality determination and control method will be described with reference to FIG.
  • the filling of the pipe line is when there is no fluid in the pipe line to start the pump to fill the fluid in the pipeline, and when the leakage occurs from the pipe to reduce the amount of fluid, the pump is operated to fill the fluid to compensate for this. Can be classified as.
  • the pressure tank level is zero, so the exhaust valve is automatically opened to raise the water level and the gas inside the pressure tank is exhausted. Even though exhaust is performed in this way, if there is no fluid in the conduit or there is no minimum pressure that can flow into the pressure tank, the measured value of the level transmitter and the level switch ON / OFF signal cannot be introduced into the pressure tank. There is no change.
  • the measured value of the level transmitter and the level switch are ON. There may be no change in the / OFF signal.
  • the head of the pipeline increases and the gas is compressed by the increased head, so that the fluid of the pipeline flows into the pressure tank by the amount of the compressed gas.
  • the pressure is increased, but the measured value of the level transmitter and the level switch ON / OFF signal may not be changed.
  • the measured value of the level transmitter and the level switch ON / OFF signal are not changed. It is determined that both the level transmitter and the level switch are normal. In this case, the filling and exhaust of the pressure tank are continuously controlled according to the measured value of the normal level transmitter.
  • the level transmitter, level switch and pressure Both sensors are determined to be normal and the filling or exhaust of the pressure tank is controlled in accordance with the measured value of the level transmitter.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

La présente invention concerne un procédé permettant de commander la détection d'une anomalie d'un système de remplissage/de vidage de réservoir sous pression et, plus particulièrement, un procédé dans lequel, lorsque un réservoir sous pression utilisé pour un système de tuyauterie, tel qu'un réservoir d'expansion ou un réservoir de protection contre le coup de bélier, est rempli avec un gaz pour ajuster le niveau d'eau ou lorsque celui-ci est évacué, toute anomalie d'un dispositif qui constitue le système de remplissage/de vidage, tel qu'un transmetteur de niveau, un commutateur de niveau, un commutateur de débit, un dispositif d'alimentation en gaz, ou une soupape de vidage, est détectée, ce qui permet de commander le niveau d'eau du réservoir sous pression de manière précise et fiable.
PCT/KR2016/001205 2015-02-04 2016-02-03 Procédé permettant de commander la détection d'une anomalie d'un système de remplissage/de vidage de réservoir sous pression Ceased WO2016126113A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2015-0017442 2015-02-04
KR20150017442 2015-02-04
KR10-2016-0013466 2016-02-03
KR1020160013466A KR101876261B1 (ko) 2015-02-04 2016-02-03 압력탱크 충진·배기 시스템의 이상 감지 제어 방법

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WO2016126113A2 true WO2016126113A2 (fr) 2016-08-11
WO2016126113A3 WO2016126113A3 (fr) 2016-09-29

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Cited By (3)

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CN106759779A (zh) * 2017-03-29 2017-05-31 中国石油天然气集团公司 一种应用于输气管道站场的在线排污装置及在线排污方法
CN108661114A (zh) * 2018-05-17 2018-10-16 马鞍山钢铁股份有限公司 一种煤气净化系统的自动补水装置及其控制方法
CN113359883A (zh) * 2020-03-06 2021-09-07 纳博特斯克有限公司 状态估计装置、控制阀、存储介质以及状态估计方法

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KR100365817B1 (ko) * 1998-05-30 2003-04-08 삼성중공업 주식회사 순환식 캐비테이션 채널의 미세 압력 조절장치
KR200184299Y1 (ko) * 2000-01-19 2000-06-01 주식회사한성산업 수충격 방지장치
KR100781711B1 (ko) * 2006-02-17 2007-12-03 양철수 검출회로부를 구비한 수충격 방지장치
KR100742398B1 (ko) * 2006-02-17 2007-07-24 양철수 수충격 방지시스템의 수충격 인식방법 및 제어방법
KR101069126B1 (ko) * 2010-09-09 2011-09-30 양재구 레벨트랜스미터와 레벨스위치를 이용한 배관 시스템의 압력탱크 수위 제어 방법

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106759779A (zh) * 2017-03-29 2017-05-31 中国石油天然气集团公司 一种应用于输气管道站场的在线排污装置及在线排污方法
CN106759779B (zh) * 2017-03-29 2019-01-29 中国石油天然气集团公司 一种应用于输气管道站场的在线排污装置及在线排污方法
CN108661114A (zh) * 2018-05-17 2018-10-16 马鞍山钢铁股份有限公司 一种煤气净化系统的自动补水装置及其控制方法
CN113359883A (zh) * 2020-03-06 2021-09-07 纳博特斯克有限公司 状态估计装置、控制阀、存储介质以及状态估计方法
CN113359883B (zh) * 2020-03-06 2024-06-07 纳博特斯克有限公司 状态估计装置、控制阀、存储介质以及状态估计方法

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