WO2022154170A1 - Method for calculating valve packing frictional force - Google Patents
Method for calculating valve packing frictional force Download PDFInfo
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- WO2022154170A1 WO2022154170A1 PCT/KR2021/003745 KR2021003745W WO2022154170A1 WO 2022154170 A1 WO2022154170 A1 WO 2022154170A1 KR 2021003745 W KR2021003745 W KR 2021003745W WO 2022154170 A1 WO2022154170 A1 WO 2022154170A1
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- packing
- valve
- stem
- friction force
- friction
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- 238000012856 packing Methods 0.000 title claims abstract description 280
- 238000000034 method Methods 0.000 title claims abstract description 39
- 210000004907 gland Anatomy 0.000 claims abstract description 65
- 230000003068 static effect Effects 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 238000002405 diagnostic procedure Methods 0.000 claims description 24
- 238000004364 calculation method Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000003745 diagnosis Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
Definitions
- the present invention relates to a method for calculating the friction force of a valve packing, and more particularly, the change in the friction force of the packing due to the pressure of the flow by a static diagnostic test without performing a dynamic diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. It relates to a method for calculating the valve packing friction force that can be easily and accurately calculated.
- valves are installed in various plants such as nuclear power plants and thermal power plants to control the flow and flow rate of fluids such as water and air, and these valves play an important role in the operation and safety of the system.
- valves installed in nuclear power plants, thermal power plants, etc. may cause a failure of the power plant to stop operation or cause a safety accident.
- a valve is a valve body having a valve seat provided in a conduit connecting an inlet and an outlet, a valve stem that selectively opens and closes a conduit by contacting and releasing contact with the valve seat when reciprocating inside the valve body, and connected to the valve stem It is composed of an assembly (hereinafter referred to as a valve assembly) including a valve actuator for reciprocally driving the valve stem in a direction toward the valve seat.
- a valve assembly an assembly including a valve actuator for reciprocally driving the valve stem in a direction toward the valve seat.
- valve assembly is installed inside the valve body in a form that surrounds the outer circumferential surface of the valve stem reciprocating inside the valve body to prevent leakage of fluid flowing through the inside of the valve body, so that the airtight between the valve stem and the valve body a valve packing for holding the , can be pressed in the direction toward the valve stem by the gland bolt (Gland bolt) and the gland nut (Gland nut).
- the apparatus and method for calculating the coefficient of friction of packing disclosed in the above publication only have a problem that it cannot accurately measure the change in the friction force of the packing due to the pressure according to the flow of the fluid with the data measured in the actual driving process of the valve assembly. Rather, in the process of calculating the packing friction coefficient, the friction force is obtained in a different valve assembly state from the actual device in a specially designed device.
- the present invention was invented to improve the above problems, and the problem to be solved by the present invention is a change in packing friction force and packing friction force measured while performing a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. After calculating the packing-stem friction coefficient and packing stress from Calculation of the valve packing friction force that can more easily calculate the packing friction force by the pressure of the flow by the diagnostic test, and more accurately calculate the change in friction force according to the packing stress change in addition to the packing-stem friction coefficient of the valve packing to provide a way
- the valve packing friction calculation method includes a valve body in which a pipe connecting an inlet and an outlet is formed, and selectively opening and closing the pipe when reciprocating inside the valve body a valve stem for reciprocating the valve stem, a valve actuator for reciprocating the valve stem, a valve packing for maintaining airtightness between the valve stem and the valve body, and a gland for pressing the valve packing in the axial direction of the valve stem (
- the method of calculating the valve packing friction force of a valve assembly including a gland) the first packing friction force in a closing stroke in which the valve stem closes the conduit through a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled measuring; measuring a second packing friction force in an opening stroke in which the valve stem opens the conduit while performing the static diagnostic test; Packing-stem coefficient of friction and packing stress of the valve packing from the first packing friction force, the first packing friction change to the first packing friction force, the second packing friction force and the second packing friction force change to the
- the measuring of the first packing friction force and the second packing friction force is characterized in that the first packing friction force and the second packing friction force are measured by a strain gauge installed on the valve stem.
- the step of calculating the packing-stem friction coefficient and the packing stress may include: the first packing friction force, the first packing friction force change, the second packing friction force, the second packing friction force change, the diameter of the valve stem;
- the packing-stem friction coefficient and the packing stress are calculated using the diameter of the gland provided on the upper side of the valve packing and the height of the valve packing.
- the step of calculating the packing-stem friction coefficient and the packing stress may include the packing-stem using the first packing friction force change, the second packing friction force change, the diameter of the valve stem and the diameter of the gland. calculating a coefficient of friction and a coefficient of packing-bonnet friction; and calculating the packing stress using the first packing friction force, the second packing friction force, the packing-stem friction coefficient, and the packing-bonnet friction coefficient.
- the packing-stem friction coefficient and the packing-bonnet friction coefficient are calculated using the following [Equation 1] to [Equation 4] It is characterized in that it is calculated.
- valve stem diameter, gland diameter and valve packing height are the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the change in packing stress, and is the ratio of the gland stress in the axial direction to the gland stress in the radial direction in the closing stroke and opening stroke, respectively.
- valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient It is a coefficient defined by .
- the calculating of the packing stress is characterized in that the packing stress is calculated using the following [Equation 5] and [Equation 6].
- the step of calculating the actual packing friction force is, using the following [Equation 7] and [Equation 8] to calculate the actual packing friction force considering the flow from the packing-stem friction coefficient and the packing stress do it with
- valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient is the coefficient defined by is a constant due to the pressure of the flow, which is a constant that considers the decrease in the contact pressure of the valve packing due to the flow pressure.
- the actual packing friction force can be more easily calculated.
- the method for calculating the valve packing friction force according to an embodiment of the present invention, by calculating the packing stress as well as the packing-stem friction coefficient from the changes in the packing friction force and the packing friction force measured during the static diagnostic test, the actual In the state where the valve stem and the valve actuator are assembled, the change in the actual packing friction force due to the pressure of the flow can be more accurately calculated by the static diagnostic test without performing the dynamic diagnostic test.
- FIG. 1 is a diagram schematically showing the structure of a valve packing friction force calculation device according to an embodiment of the present invention.
- FIG. 2 is a flowchart illustrating a method of calculating a valve packing friction force according to an embodiment of the present invention.
- FIG. 3 is a flowchart illustrating a method of calculating a packing-stem friction coefficient and a packing stress in a method for calculating a valve packing friction force according to an embodiment of the present invention.
- FIG. 1 is a diagram schematically showing the structure of a valve packing friction force calculation device according to an embodiment of the present invention.
- the valve packing frictional force calculating device 100 includes a frictional force measuring unit 110 , a frictional coefficient calculating unit 120 , and an actual frictional force calculating unit 130 . can be configured.
- the valve packing friction force calculation device 100 is a valve assembly 10 including a valve body 11 , a valve stem 12 , a valve actuator 13 , a valve packing 14 and a gland 15 . It is provided in and uses the packing-stem friction coefficient and packing stress of the valve packing 14 calculated from the change in the packing friction force measured by the friction force measuring unit 110 between the valve stem 12 and the valve packing 14 Thus, the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure caused by the flow of the fluid.
- FIG. 1 shows an example in which the valve assembly 10 is a motor-operated valve (MOV) using a driving motor as the valve actuator 13, but configuring the valve assembly 10
- the driving method of the valve actuator 13 is not limited thereto.
- the friction force measuring unit 110 may measure the packing friction force between the valve stem 12 and the valve packing 14 through a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled.
- the friction force measuring unit 110 measures the first packing friction force in the closing stroke in which the valve stem 12 closes the conduit while performing the static diagnostic test, and in the opening stroke in which the valve stem 12 opens the conduit. A second packing friction force may be measured.
- the friction force measurement unit 110 measures the first packing friction force and the second packing friction force, or during the closing stroke and the opening stroke, the first packing friction force change and the first packing friction force from the measured first packing friction force and the second packing friction force 2 The change in packing friction force can be measured.
- the friction coefficient calculator 120 is the packing of the valve packing 14 from the first packing friction force, the first packing friction force change, the second packing friction force, and the second packing friction force change measured from the friction force measuring unit 110 - stem Friction coefficient and packing stress can be calculated.
- the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure due to the flow of the fluid flowing through the conduit from the packing-stem friction coefficient and the packing stress obtained from the friction coefficient calculator 120 .
- valve packing frictional force calculating apparatus 100 calculates the actual packing frictional force in consideration of the pressure due to the flow of the fluid. will be described in detail.
- FIG. 2 is a flowchart illustrating a method for calculating a valve packing friction force according to an embodiment of the present invention.
- the friction force measuring unit 110 performs static diagnosis in a state in which the valve stem 12 and the valve actuator 13 are actually assembled. During the test, the packing friction force between the valve stem 12 and the valve packing 14 may be measured (S210, S220). Preferably, the frictional force measuring unit 110 may measure the packing frictional force by the strain gauge 111 installed on the valve stem 12 .
- the friction force measuring unit 110 measures the first packing friction force in the closing stroke in which the valve stem 12 closes the conduit while performing the static diagnostic test (S210), and the valve stem 12 opens the conduit.
- the second packing friction force may be measured in the opening stroke (S220).
- the friction force measurement unit 110 measures the first packing friction force and the second packing friction force, or during the closing stroke and the opening stroke, the first packing friction force change and the first packing friction force from the measured first packing friction force and the second packing friction force 2 The change in packing friction force can be measured.
- the friction coefficient calculator 120 is the packing of the valve packing 14 from the first packing friction force, the first packing friction force change, the second packing friction force, and the second packing friction force change measured from the friction force measuring unit 110 - stem
- the friction coefficient and the packing stress may be calculated (S230).
- the friction coefficient calculating unit 120 includes the first packing friction force, the first packing friction force change, the second packing friction force, the second packing friction force change, and the valve.
- the packing-stem friction coefficient and packing stress may be calculated using the diameter of the stem 12 , the diameter of the gland 15 provided on the upper side of the valve packing 14 , and the height of the valve packing 14 .
- FIG. 3 is a flowchart illustrating a method of calculating a packing-stem friction coefficient and a packing stress in a method for calculating a valve packing friction force according to an embodiment of the present invention.
- the process in which the friction coefficient calculation unit 120 calculates the packing-stem friction coefficient and the packing stress includes the steps of calculating the packing-stem friction coefficient and the packing-bonnet friction coefficient (S231), and packing It can be divided into the step of calculating the stress (S232).
- the friction coefficient calculator 120 may calculate the packing-stem friction coefficient and the packing-bonnet friction coefficient by using the first packing friction force change, the second packing friction force change, and the diameter of the valve stem and the gland. (S231).
- the friction coefficient calculator 120 may calculate the packing-stem friction coefficient and the packing-bonnet friction coefficient using the following [Equation 1] to [Equation 4].
- valve stem diameter is the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the change in packing stress, and is the ratio of the gland stress in the axial direction to the gland stress in the radial direction in the closing stroke and opening stroke, respectively.
- valve stem diameter is the coefficient defined by .
- the coefficient of friction calculator 120 calculates the first packing friction force while the valve stem 12 reciprocates inside the valve body 11 . and a second packing friction force. Measure the first packing friction force change through this and second packing friction change After measuring the first packing friction force change and second packing friction change Packing-stem friction coefficient from [Equation 1] to [Equation 4] using and packing-bonnet friction coefficient can be calculated.
- the friction coefficient calculator 120 changes the first packing friction force and second packing friction change A constant representing the pressure distribution of the packing material from [Equation 1] to [Equation 4] using and can be calculated first.
- the friction coefficient calculation unit 120 is a constant in [Equation 1] and [Equation 2] and After transforming the variables into the following [Equation 1-1] and [Equation 2-1], in the two equations and After erasing any one of them, the error function is performed using the following [Equation 3-1] As a method of minimizing the value of a function, or Either one can be obtained first.
- the friction coefficient calculator 120 is calculated by the [Equation 1-1] to [Equation 3-1] and After calculating and Packing-stem friction coefficient from [Equation 3] and [Equation 4] using and packing-bonnet friction coefficient can be calculated.
- the friction coefficient calculator 120 calculates the packing-stem friction coefficient and the packing-bonnet friction coefficient ( S231 ), and then the first packing friction force, the second packing friction force, the packing-stem friction coefficient and The packing stress may be calculated using the packing-bonnet friction coefficient (S232).
- the friction coefficient calculator 120 may calculate the packing stress using the following [Equation 5] and [Equation 6].
- the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure due to the flow of the fluid flowing through the conduit from the packing-stem friction coefficient and the packing stress (S240).
- the actual frictional force calculator 130 may calculate the actual packing frictional force from the packing-stem friction coefficient and the packing stress using the following [Equation 7] and [Equation 8].
- valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient is the coefficient defined by is a constant due to the pressure of the flow, which means a constant that considers the reduction of the contact pressure of the valve packing due to the flow pressure.
- the actual frictional force calculator 130 is the packing-stem friction coefficient obtained by [Equation 1] to [Equation 6] and packing stress is a constant by the pressure of the flow by substituting in Equation 7 above After finding the packing-stem friction coefficient , packing stress and constant by the pressure of the flow By substituting [Equation 6] above, the actual friction force can be calculated.
- the packing friction force and the packing friction force measured while the valve stem and the valve actuator are actually assembled while performing a static diagnostic test are obtained from the packing-stem After calculating the friction coefficient and packing stress, based on this, the actual packing friction force is calculated based on the pressure caused by the flow of the fluid. The actual packing friction force by the pressure of the flow can be more easily calculated.
- the present invention relates to a method for calculating the friction force of a valve packing, and more particularly, the change in the friction force of the packing due to the pressure of the flow by a static diagnostic test without performing a dynamic diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. It is applicable to the technical field related to the method of calculating the valve packing friction force that can be easily and accurately calculated.
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Abstract
The present invention relates to a method for calculating valve packing frictional force. A method for calculating valve packing frictional force, according to one embodiment of the present invention, is a method for calculating the valve packing frictional force of a valve assembly including: a valve body having a pipeline for connecting an inlet and an outlet; a valve stem for selectively opening/closing the pipeline when the steam reciprocates inside the valve body; a valve actuator for driving the valve steam in a reciprocative manner; a valve packing for maintaining airtightness between the valve steam and the valve body; and a gland for pressing the valve packing in the axial direction of the valve steam, the method comprising the steps of: measuring first packing frictional force during a closing operation in which the valve stem closes the pipeline, through a static diagnosis test in a state in which the valve steam and the valve actuator are actually assembled; measuring second packing frictional force during an opening operation in which the valve stem opens the pipeline, while the static diagnosis test is performed; calculating the packing-stem friction coefficient and packing stress of the valve packing from the first packing frictional force, the change in the first packing frictional force with respect to the first packing frictional force, the second packing frictional force, and the change in the second packing frictional force with respect to the second packing frictional force; and calculating, from the packing-stem friction coefficient and the packing stress, an actual packing frictional force obtained by considering the pressure generated by means of the flow of fluid flowing in the pipeline.
Description
본 발명은 밸브 패킹 마찰력 산출 방법에 관한 것으로, 보다 상세하게는 밸브 스템과 밸브 액츄에이터가 실제 조립된 상태에서 동적 진단 시험을 수행하지 않고도 정적 진단 시험에 의해 유동의 압력에 의한 패킹 마찰력의 변화를 보다 용이하고 정확하게 산출할 수 있는 밸브 패킹 마찰력 산출 방법에 관한 것이다.The present invention relates to a method for calculating the friction force of a valve packing, and more particularly, the change in the friction force of the packing due to the pressure of the flow by a static diagnostic test without performing a dynamic diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. It relates to a method for calculating the valve packing friction force that can be easily and accurately calculated.
일반적으로 원자력 발전소, 화력 발전소 등 각종 플랜트에는 물, 공기 등 유체의 흐름 및 유량을 조절하기 위해 다양한 종류의 밸브들이 설치되며, 이러한 밸브들은 시스템의 운전과 안전에 중요한 역할을 하고 있다.In general, various types of valves are installed in various plants such as nuclear power plants and thermal power plants to control the flow and flow rate of fluids such as water and air, and these valves play an important role in the operation and safety of the system.
따라서, 원자력 발전소, 화력 발전소 등에 설치된 밸브는 고장으로 인해 발전소의 운전 정지 또는 안전 사고를 유발할 수 있으므로 성능 및 건전성 확인을 위해 주기적으로 점검을 받아야 한다.Therefore, valves installed in nuclear power plants, thermal power plants, etc. may cause a failure of the power plant to stop operation or cause a safety accident.
일반적으로 밸브는 유입구와 배출구를 연결하는 관로에 구비된 밸브 시트가 형성된 밸브 몸체, 밸브 몸체의 내부에서 왕복 이동할 때에 밸브 시트에 접촉 및 접촉 해제되어 관로를 선택적으로 개폐하는 밸브 스템, 밸브 스템에 연결되어 밸브 스템을 밸브 시트를 향하는 방향으로 왕복 구동시키는 밸브 액츄에이터를 포함하는 조립체(이하, 밸브 조립체)로 구성된다.In general, a valve is a valve body having a valve seat provided in a conduit connecting an inlet and an outlet, a valve stem that selectively opens and closes a conduit by contacting and releasing contact with the valve seat when reciprocating inside the valve body, and connected to the valve stem It is composed of an assembly (hereinafter referred to as a valve assembly) including a valve actuator for reciprocally driving the valve stem in a direction toward the valve seat.
이 때, 밸브 조립체는 밸브 몸체의 내부를 흐르는 유체의 누설을 방지하기 위해 밸브 몸체의 내부에서 왕복 이동하는 밸브 스템의 외주면을 감싸는 형태로 밸브 몸체의 내부에 설치되어 밸브 스템과 밸브 몸체 사이의 기밀을 유지하기 위한 밸브 패킹을 포함하며, 이러한 밸브 패킹은 밸브 몸체의 내부 또는 외부에 설치된 글랜드(Gland)(또는, 패킹 글랜드(Packing Gland))를 구성하는 글랜드 스터드(Gland stud)(또는, 글랜드 볼트(Gland bolt))와 글랜드 너트(Gland nut)에 의해 밸브 스템을 향하는 방향으로 가압될 수 있다.At this time, the valve assembly is installed inside the valve body in a form that surrounds the outer circumferential surface of the valve stem reciprocating inside the valve body to prevent leakage of fluid flowing through the inside of the valve body, so that the airtight between the valve stem and the valve body a valve packing for holding the , can be pressed in the direction toward the valve stem by the gland bolt (Gland bolt) and the gland nut (Gland nut).
한편, 밸브 조립체의 운전 성능을 진단하거나 밸브 조립체를 설계하기 위해 밸브 조립체의 구동에 필요한 힘을 계산하고자 할 때에는 밸브 패킹에 의해 밸브 스템에 작용하는 패킹 마찰력을 반드시 고려해야한다. 이러한 패킹 마찰력을 예측하기 위해서는 밸브 패킹의 정확한 마찰 계수를 알아야 하나, 밸브 패킹의 제조사 등에서 단순히 제공되는 마찰 계수는 밸브 조립체의 실제 구동 과정에서 정확한 패킹 마찰력을 계산하는데 있어서 별 도움이 되지 못하고 있는 실정이다.Meanwhile, when diagnosing the operation performance of the valve assembly or calculating the force required to drive the valve assembly to design the valve assembly, the packing friction force acting on the valve stem by the valve packing must be considered. In order to predict such packing friction force, it is necessary to know the exact friction coefficient of the valve packing, but the friction coefficient simply provided by the manufacturer of the valve packing, etc. is not very helpful in calculating the accurate packing friction force in the actual driving process of the valve assembly. .
이러한 문제점을 위해 밸브 조립체의 구동 과정에서 정확한 패킹 마찰력을 예측하기 위한 다양한 기술들이 개발되고 있다. 예를 들어, 국내 공개특허공보 제10-2013-0017885호(밸브패킹 마찰계수 시험장치 및 그 방법)(2013년 2월 20일 공개)에는 밸브 스템을 왕복시키는 과정에서 글랜드 응력 및 패킹 마찰력을 연속 측정하고, 측정된 글랜드 응력과 패킹 마찰력을 이용하여 패킹 마찰계수를 산출하는 기술이 개시되어 있다.For this problem, various techniques have been developed for predicting the accurate packing friction force in the driving process of the valve assembly. For example, in Korea Patent Publication No. 10-2013-0017885 (valve packing friction coefficient test apparatus and method) (published on February 20, 2013), gland stress and packing friction force are measured in the process of reciprocating the valve stem. A technique for continuously measuring and calculating a packing friction coefficient using the measured gland stress and packing friction force is disclosed.
그러나, 상기 공개특허공보에 개시된 패킹 마찰계수 산출 장치 및 방법은 밸브 조립체의 실제 구동 과정에서 측정된 데이터를 가지고 유체의 유동에 따른 압력에 의한 패킹 마찰력의 변화를 정확하게 측정할 수 없다는 문제점이 있을 뿐 아니라, 패킹 마찰계수의 산출 과정에 특수하게 고안된 장치에 실제와 다른 밸브 조립 상태에서 마찰력을 구한다.However, the apparatus and method for calculating the coefficient of friction of packing disclosed in the above publication only have a problem that it cannot accurately measure the change in the friction force of the packing due to the pressure according to the flow of the fluid with the data measured in the actual driving process of the valve assembly. Rather, in the process of calculating the packing friction coefficient, the friction force is obtained in a different valve assembly state from the actual device in a specially designed device.
따라서, 밸브 스템과 밸브 액츄에이터가 실제 조립된 상태에서 동적 진단 시험을 수행하지 않고도 정적 진단 시험에 의해 유동의 압력에 의한 패킹 마찰력의 변화를 보다 용이하고 정확하게 산출할 수 있는 밸브 패킹 마찰력 산출 방법이 요구된다.Therefore, there is a need for a method for calculating the valve packing friction force that can more easily and accurately calculate the change in the packing friction force due to the pressure of the flow by a static diagnostic test without performing a dynamic diagnostic test in the state in which the valve stem and the valve actuator are actually assembled. do.
본 발명은 상기한 문제점을 개선하기 위해 발명된 것으로, 본 발명이 해결하고자 하는 과제는, 밸브 스템과 밸브 액츄에이터가 실제 조립된 상태에서 정적 진단 시험을 수행하는 동안 측정된 패킹 마찰력 및 패킹 마찰력의 변화로부터 패킹-스템 마찰 계수 및 패킹 응력을 산출한 후, 이를 토대로 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출함으로써, 실제 밸브 스템과 밸브 엑츄에이터가 조립된 상태에서 동적 진단 시험을 수행하지 않고 정적 진단 시험에 의해 유동의 압력에 의한 패킹 마찰력을 보다 용이하게 산출할 수 있을 뿐 아니라, 밸브 패킹의 패킹-스템 마찰 계수 이외에도 패킹 응력 변화에 따른 마찰력의 변화를 보다 정확하게 산출할 수 있는 밸브 패킹 마찰력 산출 방법을 제공하는 것이다.The present invention was invented to improve the above problems, and the problem to be solved by the present invention is a change in packing friction force and packing friction force measured while performing a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. After calculating the packing-stem friction coefficient and packing stress from Calculation of the valve packing friction force that can more easily calculate the packing friction force by the pressure of the flow by the diagnostic test, and more accurately calculate the change in friction force according to the packing stress change in addition to the packing-stem friction coefficient of the valve packing to provide a way
본 발명의 기술적 과제는 이상에서 언급한 것들로 제한되지 않으며, 언급되지 않은 또 다른 기술적 과제는 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The technical problem of the present invention is not limited to those mentioned above, and another technical problem not mentioned will be clearly understood by those skilled in the art from the following description.
상기 과제를 달성하기 위하여, 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법은, 유입구와 배출구를 연결하는 관로가 형성된 밸브 몸체와, 상기 밸브 몸체의 내부에서 왕복 이동할 때에 상기 관로를 선택적으로 개폐하는 밸브 스템과, 상기 밸브 스템을 왕복 구동시키는 밸브 액츄에이터와, 상기 밸브 스템과 상기 밸브 몸체 사이의 기밀을 유지하는 밸브 패킹과, 상기 밸브 패킹을 상기 밸브 스템의 축 방향으로 가압하기 위한 글랜드(Gland)를 포함하는 밸브 조립체의 밸브 패킹 마찰력 산출 방법에 있어서, 상기 밸브 스템과 상기 밸브 액츄에이터가 실제 조립된 상태에서 정적 진단 시험을 통해 상기 밸브 스템이 상기 관로를 폐쇄하는 닫힘 행정에서 제1 패킹 마찰력을 측정하는 단계; 상기 정적 진단 시험을 수행하는 동안, 상기 밸브 스템이 상기 관로를 개방하는 열림 행정에서 제2 패킹 마찰력을 측정하는 단계; 상기 제1 패킹 마찰력, 상기 제1 패킹 마찰력에 대한 제1 패킹 마찰력 변화, 상기 제2 패킹 마찰력 및 상기 제2 패킹 마찰력에 대한 제2 패킹 마찰력 변화로부터 상기 밸브 패킹의 패킹-스템 마찰 계수 및 패킹 응력을 산출하는 단계; 및 상기 패킹-스템 마찰 계수 및 상기 패킹 응력으로부터 상기 관로를 흐르는 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출하는 단계를 포함하는 것을 특징으로 한다.In order to achieve the above object, the valve packing friction calculation method according to an embodiment of the present invention includes a valve body in which a pipe connecting an inlet and an outlet is formed, and selectively opening and closing the pipe when reciprocating inside the valve body a valve stem for reciprocating the valve stem, a valve actuator for reciprocating the valve stem, a valve packing for maintaining airtightness between the valve stem and the valve body, and a gland for pressing the valve packing in the axial direction of the valve stem ( In the method of calculating the valve packing friction force of a valve assembly including a gland), the first packing friction force in a closing stroke in which the valve stem closes the conduit through a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled measuring; measuring a second packing friction force in an opening stroke in which the valve stem opens the conduit while performing the static diagnostic test; Packing-stem coefficient of friction and packing stress of the valve packing from the first packing friction force, the first packing friction change to the first packing friction force, the second packing friction force and the second packing friction force change to the second packing friction force. calculating ; and calculating an actual packing friction force in consideration of the pressure due to the flow of the fluid flowing through the conduit from the packing-stem friction coefficient and the packing stress.
이 때, 상기 제1 패킹 마찰력 및 상기 제2 패킹 마찰력을 측정하는 단계는, 상기 밸브 스템에 설치된 스트레인 게이지에 의해 상기 제1 패킹 마찰력 및 상기 제2 패킹 마찰력을 측정하는 것을 특징으로 한다.In this case, the measuring of the first packing friction force and the second packing friction force is characterized in that the first packing friction force and the second packing friction force are measured by a strain gauge installed on the valve stem.
또한, 상기 패킹-스템 마찰 계수 및 상기 패킹 응력을 산출하는 단계는, 상기 제1 패킹 마찰력, 상기 제1 패킹 마찰력 변화, 상기 제2 패킹 마찰력, 상기 제2 패킹 마찰력 변화, 상기 밸브 스템의 직경, 상기 밸브 패킹의 상측에 구비된 글랜드의 직경 및 상기 밸브 패킹의 높이를 이용하여 상기 패킹-스템 마찰 계수 및 상기 패킹 응력을 산출하는 것을 특징으로 한다.In addition, the step of calculating the packing-stem friction coefficient and the packing stress may include: the first packing friction force, the first packing friction force change, the second packing friction force, the second packing friction force change, the diameter of the valve stem; The packing-stem friction coefficient and the packing stress are calculated using the diameter of the gland provided on the upper side of the valve packing and the height of the valve packing.
특히, 상기 패킹-스템 마찰 계수 및 상기 패킹 응력을 산출하는 단계는, 상기 제1 패킹 마찰력 변화, 상기 제2 패킹 마찰력 변화, 상기 밸브 스템의 직경 및 상기 글랜드의 직경을 이용하여 상기 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출하는 단계; 및 상기 제1 패킹 마찰력, 상기 제2 패킹 마찰력, 상기 패킹-스템 마찰 계수 및 상기 패킹-본닛 마찰 계수를 이용하여 상기 패킹 응력을 산출하는 단계를 포함하는 것을 특징으로 한다.In particular, the step of calculating the packing-stem friction coefficient and the packing stress may include the packing-stem using the first packing friction force change, the second packing friction force change, the diameter of the valve stem and the diameter of the gland. calculating a coefficient of friction and a coefficient of packing-bonnet friction; and calculating the packing stress using the first packing friction force, the second packing friction force, the packing-stem friction coefficient, and the packing-bonnet friction coefficient.
바람직하게는, 상기 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출하는 단계는, 하기 [수학식 1] 내지 [수학식 4]를 이용하여 상기 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출하는 것을 특징으로 한다.Preferably, in the step of calculating the packing-stem friction coefficient and the packing-bonnet friction coefficient, the packing-stem friction coefficient and the packing-bonnet friction coefficient are calculated using the following [Equation 1] to [Equation 4] It is characterized in that it is calculated.
[수학식 1][Equation 1]
[수학식 2][Equation 2]
[수학식 3][Equation 3]
[수학식 4][Equation 4]
(여기서, 
및 
은 각각 제1 패킹 마찰력 변화 및 제2 패킹 마찰력 변화, 
및 
는 각각 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수, 
, 
, 
은 각각 밸브 스템 직경, 글랜드 직경 및 밸브 패킹 높이, 
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율, 
는 패킹 응력 변화를 의미하며, 
및 
은 각각 닫힘 행정 및 열림 행정에서 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율 
, 밸브 스템 직경 
, 글랜드 직경 
, 패킹-스템 마찰 계수 
및 패킹-본닛 마찰 계수 
에 의해 정의되는 계수임.)(here, and is the change in the first packing friction force and the change in the second packing friction force, respectively; and are the packing-stem friction coefficient and packing-bonnet friction coefficient, respectively, , , are the valve stem diameter, gland diameter and valve packing height, respectively; is the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the change in packing stress, and is the ratio of the gland stress in the axial direction to the gland stress in the radial direction in the closing stroke and opening stroke, respectively. , valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient It is a coefficient defined by .)
또한, 바람직하게는, 상기 패킹 응력을 산출하는 단계는, 하기 [수학식 5] 및 [수학식 6]을 이용하여 상기 패킹 응력을 산출하는 것을 특징으로 한다.In addition, preferably, the calculating of the packing stress is characterized in that the packing stress is calculated using the following [Equation 5] and [Equation 6].
[수학식 5][Equation 5]
[수학식 6][Equation 6]
(여기서, 
및 
은 각각 제1 패킹 응력 및 제2 패킹 응력, 
및 
은 각각 제1 패킹 마찰력 및 제2 패킹 마찰력, 
는 패킹-스템 마찰 계수, 
, 
, 
은 각각 밸브 스템 직경, 글랜드 직경 및 밸브 패킹 높이, 
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율을 의미하며, 
는 밸브 스템 직경 
, 글랜드 직경 
, 패킹-스템 마찰 계수 
및 패킹-본닛 마찰 계수 
에 의해 정의되는 계수(
)임.)(here, and are the first packing stress and the second packing stress, respectively; and are the first packing friction force and the second packing friction force, respectively; is the packing-stem friction coefficient, , , are the valve stem diameter, gland diameter and valve packing height, respectively; is the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient The coefficient defined by ( )lim.)
한편, 상기 실제 패킹 마찰력을 산출하는 단계는, 하기 [수학식 7] 및 [수학식 8]을 이용하여 상기 패킹-스템 마찰 계수 및 상기 패킹 응력으로부터 유동을 고려한 상기 실제 패킹 마찰력을 산출하는 것을 특징으로 한다.On the other hand, the step of calculating the actual packing friction force is, using the following [Equation 7] and [Equation 8] to calculate the actual packing friction force considering the flow from the packing-stem friction coefficient and the packing stress do it with
[수학식 7][Equation 7]
[수학식 8][Equation 8]
(여기서, 
은 실제 패킹 마찰력이고, 
는 밸브 스템의 직경, 
는 패킹-스템 마찰 계수, 
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율, 
는 패킹 응력, 
은 밸브 패킹 높이이며, 
는 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율 
, 밸브 스템 직경 
, 글랜드 직경 
, 패킹-스템 마찰 계수 
및 패킹-본닛 마찰 계수 
에 의해 정의되는 계수이고, 
는 유동의 압력에 의한 상수로서 유동 압력에 의해 밸브 패킹의 접촉 압력의 감소를 고려하는 상수임.)(here, is the actual packing friction, is the diameter of the valve stem, is the packing-stem friction coefficient, is the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the packing stress, is the valve packing height, is the ratio of the gland stress in the axial direction to the gland stress in the radial direction. , valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient is the coefficient defined by is a constant due to the pressure of the flow, which is a constant that considers the decrease in the contact pressure of the valve packing due to the flow pressure.)
기타 실시예들의 구체적인 사항들은 상세한 설명 및 도면들에 포함되어 있다.The details of other embodiments are included in the detailed description and drawings.
본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법에 따르면, 밸브 스템과 밸브 액츄에이터가 실제 조립된 상태에서 정적 진단 시험을 수행하는 동안 측정된 패킹 마찰력 및 패킹 마찰력의 변화로부터 패킹-스템 마찰 계수 및 패킹 응력을 산출한 후, 이를 토대로 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출함으로써, 실제 밸브 스템과 밸브 엑츄에이터가 조립된 상태에서 동적 진단 시험을 수행하지 않고 정적 진단 시험에 의해 유동의 압력에 의한 실제 패킹 마찰력을 보다 용이하게 산출할 수 있다.According to the valve packing friction calculation method according to an embodiment of the present invention, the packing-stem friction coefficient and After calculating the packing stress, by calculating the actual packing frictional force considering the pressure caused by the flow of the fluid based on this, the pressure of the flow is performed by the static diagnostic test without performing the dynamic diagnostic test in the state that the actual valve stem and valve actuator are assembled. The actual packing friction force can be more easily calculated.
또한, 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법에 따르면, 정적 진단 시험을 수행하는 동안 측정된 패킹 마찰력 및 패킹 마찰력의 변화로부터 패킹-스템 마찰 계수뿐 만 아니라 패킹 응력도 함께 산출함으로써, 실제 밸브 스템과 밸브 엑츄에이터가 조립된 상태에서 동적 진단 시험을 수행하지 않고 정적 진단 시험에 의해 유동의 압력에 의한 실제 패킹 마찰력의 변화를 보다 정확하게 산출할 수 있다.In addition, according to the method for calculating the valve packing friction force according to an embodiment of the present invention, by calculating the packing stress as well as the packing-stem friction coefficient from the changes in the packing friction force and the packing friction force measured during the static diagnostic test, the actual In the state where the valve stem and the valve actuator are assembled, the change in the actual packing friction force due to the pressure of the flow can be more accurately calculated by the static diagnostic test without performing the dynamic diagnostic test.
본 발명의 효과들은 이상에서 언급한 효과들로 제한되지 않으며, 언급되지 않은 또 다른 효과들은 청구범위의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.
도 1은 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 장치의 구조를 개략적으로 나타내는 도면이다.1 is a diagram schematically showing the structure of a valve packing friction force calculation device according to an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법을 나타내는 순서도이다.2 is a flowchart illustrating a method of calculating a valve packing friction force according to an embodiment of the present invention.
도 3은 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법에서 패킹-스템 마찰 계수 및 패킹 응력을 산출하는 방법을 나타내는 순서도이다.3 is a flowchart illustrating a method of calculating a packing-stem friction coefficient and a packing stress in a method for calculating a valve packing friction force according to an embodiment of the present invention.
이하, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 본 발명을 용이하게 실시할 수 있을 정도로 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세하게 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings to the extent that those of ordinary skill in the art to which the present invention pertains can easily practice the present invention.
실시예를 설명함에 있어서 본 발명이 속하는 기술 분야에 익히 알려져 있고 본 발명과 직접적으로 관련이 없는 기술 내용에 대해서는 설명을 생략한다. 이는 불필요한 설명을 생략함으로써 본 발명의 요지를 흐리지 않고 더욱 명확히 전달하기 위함이다.In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present invention pertains and are not directly related to the present invention will be omitted. This is to more clearly convey the gist of the present invention by omitting unnecessary description.
마찬가지 이유로 첨부 도면에 있어서 일부 구성요소는 과장되거나 생략되거나 개략적으로 도시되었다. 또한, 각 구성요소의 크기는 실제 크기를 전적으로 반영하는 것이 아니다. 각 도면에서 동일한 또는 대응하는 구성요소에는 동일한 참조 번호를 부여하였다.For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each figure, the same or corresponding elements are assigned the same reference numerals.
또한, 장치 또는 요소 방향(예를 들어 "전(front)", "후(back)", "위(up)", "아래(down)", "상(top)", "하(bottom)", "좌(left)", "우(right)", "횡(lateral)")등과 같은 용어들에 관하여 본원에 사용된 표현 및 술어는 단지 본 발명의 설명을 단순화하기 위해 사용되고, 관련된 장치 또는 요소가 단순히 특정 방향을 가져야 함을 나타내거나 의미하지 않는다는 것을 알 수 있을 것이다.Also, device or element orientation (eg "front", "back", "up", "down", "top", "bottom") The expressions and predicates used herein with respect to terms such as ", "left", "right", "lateral", etc. are used merely to simplify the description of the invention, and the associated apparatus Or it will be appreciated that it does not simply indicate or imply that an element must have a particular orientation.
이하, 본 발명의 일 실시예에 의하여 밸브 패킹 마찰력 산출 방법을 설명하기 위한 도면들을 참고하여 본 발명에 대해 설명하도록 한다.Hereinafter, the present invention will be described with reference to the drawings for explaining a method of calculating a valve packing friction force according to an embodiment of the present invention.
도 1은 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 장치의 구조를 개략적으로 나타내는 도면이다.1 is a diagram schematically showing the structure of a valve packing friction force calculation device according to an embodiment of the present invention.
도 1에 도시된 바와 같이, 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 장치(100)는 마찰력 측정부(110), 마찰 계수 산출부(120) 및 실제 마찰력 산출부(130)를 포함하여 구성될 수 있다.As shown in FIG. 1 , the valve packing frictional force calculating device 100 according to an embodiment of the present invention includes a frictional force measuring unit 110 , a frictional coefficient calculating unit 120 , and an actual frictional force calculating unit 130 . can be configured.
이러한 밸브 패킹 마찰력 산출 장치(100)는 밸브 몸체(11), 밸브 스템(12), 밸브 액츄에이터(13), 밸브 패킹(14) 및 글랜드(Gland)(15)를 포함하는 밸브 조립체(10)에 구비되며, 밸브 스템(12)과 밸브 패킹(14) 사이에서 마찰력 측정부(110)에 의해 측정된 패킹 마찰력의 변화로부터 산출된 밸브 패킹(14)의 패킹-스템 마찰 계수 및 패킹 응력을 이용하여 실제 마찰력 산출부(130)에서 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출할 수 있다.The valve packing friction force calculation device 100 is a valve assembly 10 including a valve body 11 , a valve stem 12 , a valve actuator 13 , a valve packing 14 and a gland 15 . It is provided in and uses the packing-stem friction coefficient and packing stress of the valve packing 14 calculated from the change in the packing friction force measured by the friction force measuring unit 110 between the valve stem 12 and the valve packing 14 Thus, the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure caused by the flow of the fluid.
설명의 편의상, 도 1에서는 밸브 조립체(10)가 밸브 액츄에이터(13)로 구동 모터를 사용하는 모터 구동 밸브(Motor-Operated Valve, MOV)인 예를 도시하고 있으나, 밸브 조립체(10)를 구성하는 밸브 액츄에이터(13)의 구동 방식은 이에 한정되지 않는다.For convenience of explanation, FIG. 1 shows an example in which the valve assembly 10 is a motor-operated valve (MOV) using a driving motor as the valve actuator 13, but configuring the valve assembly 10 The driving method of the valve actuator 13 is not limited thereto.
먼저, 마찰력 측정부(110)는 밸브 스템과 밸브 액츄에이터가 실제 조립된 상태에서 정적 진단 시험을 통해 밸브 스템(12)과 밸브 패킹(14) 사이의 패킹 마찰력을 측정할 수 있다.First, the friction force measuring unit 110 may measure the packing friction force between the valve stem 12 and the valve packing 14 through a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled.
즉, 마찰력 측정부(110)는 정적 진단 시험을 수행하는 동안 밸브 스템(12)이 관로를 폐쇄하는 닫힘 행정에서 제1 패킹 마찰력을 측정하고, 밸브 스템(12)이 관로를 개방하는 열림 행정에서 제2 패킹 마찰력을 측정할 수 있다. 또한, 마찰력 측정부(110)는 제1 패킹 마찰력 및 제2 패킹 마찰력을 측정하는 동안, 또는, 닫힘 행정 및 열림 행정 동안 측정된 제1 패킹 마찰력 및 제2 패킹 마찰력으로부터 제1 패킹 마찰력 변화 및 제2 패킹 마찰력 변화를 측정할 수 있다.That is, the friction force measuring unit 110 measures the first packing friction force in the closing stroke in which the valve stem 12 closes the conduit while performing the static diagnostic test, and in the opening stroke in which the valve stem 12 opens the conduit. A second packing friction force may be measured. In addition, the friction force measurement unit 110 measures the first packing friction force and the second packing friction force, or during the closing stroke and the opening stroke, the first packing friction force change and the first packing friction force from the measured first packing friction force and the second packing friction force 2 The change in packing friction force can be measured.
그리고, 마찰 계수 산출부(120)는 마찰력 측정부(110)로부터 측정된 제1 패킹 마찰력, 제1 패킹 마찰력 변화, 제2 패킹 마찰력 및 제2 패킹 마찰력 변화로부터 밸브 패킹(14)의 패킹-스템 마찰 계수 및 패킹 응력을 산출할 수 있다. 마지막으로, 실제 마찰력 산출부(130)는 마찰 계수 산출부(120)로부터 구해진 패킹-스템 마찰 계수 및 패킹 응력으로부터 관로를 흐르는 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출할 수 있다.And, the friction coefficient calculator 120 is the packing of the valve packing 14 from the first packing friction force, the first packing friction force change, the second packing friction force, and the second packing friction force change measured from the friction force measuring unit 110 - stem Friction coefficient and packing stress can be calculated. Finally, the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure due to the flow of the fluid flowing through the conduit from the packing-stem friction coefficient and the packing stress obtained from the friction coefficient calculator 120 .
이하, 도 2 및 도 3을 참조하여, 상기와 같이 구성되는 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 장치(100)가 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출하는 과정에 대해서 자세히 설명하기로 한다.Hereinafter, with reference to FIGS. 2 and 3 , the valve packing frictional force calculating apparatus 100 according to an embodiment of the present invention configured as described above calculates the actual packing frictional force in consideration of the pressure due to the flow of the fluid. will be described in detail.
도 2는 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법을 나타내는 순서도이다.2 is a flowchart illustrating a method for calculating a valve packing friction force according to an embodiment of the present invention.
도 2에 도시된 바와 같이, 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법의 경우, 마찰력 측정부(110)는 밸브 스템(12)과 밸브 액츄에이터(13)가 실제 조립된 상태에서 정적 진단 시험을 수행하는 동안, 밸브 스템(12)과 밸브 패킹(14) 사이의 패킹 마찰력을 측정할 수 있다(S210, S220). 바람직하게는, 마찰력 측정부(110)는 밸브 스템(12)에 설치된 스트레인 게이지(111)에 의해 패킹 마찰력을 측정할 수 있다.As shown in FIG. 2 , in the case of the method for calculating the friction force of a valve packing according to an embodiment of the present invention, the friction force measuring unit 110 performs static diagnosis in a state in which the valve stem 12 and the valve actuator 13 are actually assembled. During the test, the packing friction force between the valve stem 12 and the valve packing 14 may be measured (S210, S220). Preferably, the frictional force measuring unit 110 may measure the packing frictional force by the strain gauge 111 installed on the valve stem 12 .
즉, 마찰력 측정부(110)는 정적 진단 시험을 수행하는 동안, 밸브 스템(12)이 관로를 폐쇄하는 닫힘 행정에서 제1 패킹 마찰력을 측정하고(S210), 밸브 스템(12)이 관로를 개방하는 열림 행정에서 제2 패킹 마찰력을 측정할 수 있다(S220).That is, the friction force measuring unit 110 measures the first packing friction force in the closing stroke in which the valve stem 12 closes the conduit while performing the static diagnostic test (S210), and the valve stem 12 opens the conduit. The second packing friction force may be measured in the opening stroke (S220).
또한, 마찰력 측정부(110)는 제1 패킹 마찰력 및 제2 패킹 마찰력을 측정하는 동안, 또는, 닫힘 행정 및 열림 행정 동안 측정된 제1 패킹 마찰력 및 제2 패킹 마찰력으로부터 제1 패킹 마찰력 변화 및 제2 패킹 마찰력 변화를 측정할 수 있다.In addition, the friction force measurement unit 110 measures the first packing friction force and the second packing friction force, or during the closing stroke and the opening stroke, the first packing friction force change and the first packing friction force from the measured first packing friction force and the second packing friction force 2 The change in packing friction force can be measured.
그리고, 마찰 계수 산출부(120)는 마찰력 측정부(110)로부터 측정된 제1 패킹 마찰력, 제1 패킹 마찰력 변화, 제2 패킹 마찰력 및 제2 패킹 마찰력 변화로부터 밸브 패킹(14)의 패킹-스템 마찰 계수 및 패킹 응력을 산출할 수 있다(S230).And, the friction coefficient calculator 120 is the packing of the valve packing 14 from the first packing friction force, the first packing friction force change, the second packing friction force, and the second packing friction force change measured from the friction force measuring unit 110 - stem The friction coefficient and the packing stress may be calculated (S230).
이 때, 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법의 경우, 마찰 계수 산출부(120)는 제1 패킹 마찰력, 제1 패킹 마찰력 변화, 제2 패킹 마찰력, 제2 패킹 마찰력 변화, 밸브 스템(12)의 직경, 밸브 패킹(14)의 상측에 구비된 글랜드(15)의 직경 및 밸브 패킹(14)의 높이를 이용하여 패킹-스템 마찰 계수 및 패킹 응력을 산출할 수 있다.At this time, in the case of the valve packing friction calculation method according to an embodiment of the present invention, the friction coefficient calculating unit 120 includes the first packing friction force, the first packing friction force change, the second packing friction force, the second packing friction force change, and the valve. The packing-stem friction coefficient and packing stress may be calculated using the diameter of the stem 12 , the diameter of the gland 15 provided on the upper side of the valve packing 14 , and the height of the valve packing 14 .
도 3은 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법에서 패킹-스템 마찰 계수 및 패킹 응력을 산출하는 방법을 나타내는 순서도이다.3 is a flowchart illustrating a method of calculating a packing-stem friction coefficient and a packing stress in a method for calculating a valve packing friction force according to an embodiment of the present invention.
도 3에 도시된 바와 같이, 마찰 계수 산출부(120)가 패킹-스템 마찰 계수 및 패킹 응력을 산출하는 과정은 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출하는 단계(S231)와, 패킹 응력을 산출하는 단계(S232)로 나뉠 수 있다.As shown in FIG. 3 , the process in which the friction coefficient calculation unit 120 calculates the packing-stem friction coefficient and the packing stress includes the steps of calculating the packing-stem friction coefficient and the packing-bonnet friction coefficient (S231), and packing It can be divided into the step of calculating the stress (S232).
먼저, 마찰 계수 산출부(120)는 제1 패킹 마찰력 변화, 제2 패킹 마찰력 변화, 밸브 스템의 직경 및 글랜드의 직경을 이용하여 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출할 수 있다(S231).First, the friction coefficient calculator 120 may calculate the packing-stem friction coefficient and the packing-bonnet friction coefficient by using the first packing friction force change, the second packing friction force change, and the diameter of the valve stem and the gland. (S231).
바람직하게는, 마찰 계수 산출부(120)는 하기 [수학식 1] 내지 [수학식 4]를 이용하여 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출할 수 있다.Preferably, the friction coefficient calculator 120 may calculate the packing-stem friction coefficient and the packing-bonnet friction coefficient using the following [Equation 1] to [Equation 4].
[수학식 1][Equation 1]
[수학식 2][Equation 2]
[수학식 3][Equation 3]
[수학식 4][Equation 4]
여기서, 
및 
은 각각 제1 패킹 마찰력 변화 및 제2 패킹 마찰력 변화, 
및 
는 각각 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수, 
, 
, 
은 각각 밸브 스템 직경, 글랜드 직경 및 밸브 패킹 높이, 
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율, 
는 패킹 응력 변화를 의미하며, 
및 
은 각각 닫힘 행정 및 열림 행정에서 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율 
, 밸브 스템 직경 
, 글랜드 직경 
, 패킹-스템 마찰 계수 
및 패킹-본닛 마찰 계수 
에 의해 정의되는 계수를 의미한다.here, and is the change in the first packing friction force and the change in the second packing friction force, respectively; and are the packing-stem friction coefficient and packing-bonnet friction coefficient, respectively, , , are the valve stem diameter, gland diameter and valve packing height, respectively; is the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the change in packing stress, and is the ratio of the gland stress in the axial direction to the gland stress in the radial direction in the closing stroke and opening stroke, respectively. , valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient It means the coefficient defined by .
이 때, [수학식 1] 및 [수학식 2]에서 
는 압력 분포를 고려하기 위한 상수로서 최대 값은 밸브 패킹 높이(두께) 
값을 가질 수 있다. 또한, 
및 
은 패킹 재료에서 글랜드 응력이 형성되는 분포의 모양을 결정하는 상수로서 닫힘 행정에서의 
과 열림 행정에서의 
은 서로 다른 값을 가질 수 있다. 일반적으로 열림 행정(상부 방향)에서의 
값은 상대적으로 큰 값을 가지므로 글랜드 응력은 상부에 집중되고 닫힘 행정(하부 방향)에서의 
값은 상대적으로 작은 값을 가지므로 글랜드 응력은 상부와 하부에 분배되는 분포를 가질 수 있다.At this time, in [Equation 1] and [Equation 2] is a constant to consider the pressure distribution, and the maximum value is the valve packing height (thickness) can have a value. In addition, and is a constant that determines the shape of the distribution in which the gland stress forms in the packing material and is and in open stroke may have different values. in the normally open stroke (upward direction) Since the value has a relatively large value, the gland stress is concentrated at the top and Since the value has a relatively small value, the gland stress can have a distribution distributed in the upper and lower parts.
바람직하게는, 마찰 계수 산출부(120)는 밸브 스템(12)이 밸브 몸체(11)의 내부에서 왕복 이동하는 동안 제1 패킹 마찰력 
및 제2 패킹 마찰력 
을 측정하고, 이를 통해 제1 패킹 마찰력 변화 
및 제2 패킹 마찰력 변화 
을 측정한 후, 제1 패킹 마찰력 변화 
및 제2 패킹 마찰력 변화 
을 이용하여 상기 [수학식 1] 내지 [수학식 4]로부터 패킹-스템 마찰 계수 
및 패킹-본닛 마찰 계수 
를 산출할 수 있다.Preferably, the coefficient of friction calculator 120 calculates the first packing friction force while the valve stem 12 reciprocates inside the valve body 11 . and a second packing friction force. Measure the first packing friction force change through this and second packing friction change After measuring the first packing friction force change and second packing friction change Packing-stem friction coefficient from [Equation 1] to [Equation 4] using and packing-bonnet friction coefficient can be calculated.
먼저, 마찰 계수 산출부(120)는 제1 패킹 마찰력 변화 
및 제2 패킹 마찰력 변화 
을 이용하여 상기 [수학식 1] 내지 [수학식 4]로부터 패킹 재료의 압력 분포를 나타내는 상수 
및 
을 먼저 산출할 수 있다. 이 때, 마찰 계수 산출부(120)는 상기 [수학식 1] 및 [수학식 2]를 상수 
및 
에 대해 변수 변환하여 하기 [수학식 1-1] 및 [수학식 2-1]로 변환한 후, 2 개의 수학식에서 
및 
중 어느 하나를 먼저 소거한 후, 하기 [수학식 3-1]을 이용하여 에러 함수 
함수 값을 최소하시키는 방법으로 미지수인 
또는 
중 어느 하나를 먼저 구할 수 있다.First, the friction coefficient calculator 120 changes the first packing friction force and second packing friction change A constant representing the pressure distribution of the packing material from [Equation 1] to [Equation 4] using and can be calculated first. At this time, the friction coefficient calculation unit 120 is a constant in [Equation 1] and [Equation 2] and After transforming the variables into the following [Equation 1-1] and [Equation 2-1], in the two equations and After erasing any one of them, the error function is performed using the following [Equation 3-1] As a method of minimizing the value of a function, or Either one can be obtained first.
[수학식 1-1][Equation 1-1]
[수학식 2-1][Equation 2-1]
[수학식 3-1][Equation 3-1]
또한, 마찰 계수 산출부(120)는 상기 [수학식 1-1] 내지 [수학식 3-1]에 의해 
및 
을 산출한 후, 
및 
을 이용하여 상기 [수학식 3] 및 [수학식 4]로부터 패킹-스템 마찰 계수 
및 패킹-본닛 마찰 계수 
를 산출할 수 있다.In addition, the friction coefficient calculator 120 is calculated by the [Equation 1-1] to [Equation 3-1] and After calculating and Packing-stem friction coefficient from [Equation 3] and [Equation 4] using and packing-bonnet friction coefficient can be calculated.
다시 도 3을 참조하면, 마찰 계수 산출부(120)는 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출한 후(S231), 제1 패킹 마찰력, 제2 패킹 마찰력, 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 이용하여 패킹 응력을 산출할 수 있다(S232).Referring back to FIG. 3 , the friction coefficient calculator 120 calculates the packing-stem friction coefficient and the packing-bonnet friction coefficient ( S231 ), and then the first packing friction force, the second packing friction force, the packing-stem friction coefficient and The packing stress may be calculated using the packing-bonnet friction coefficient (S232).
바람직하게는, 마찰 계수 산출부(120)는 하기 [수학식 5] 및 [수학식 6]을 이용하여 패킹 응력을 산출할 수 있다.Preferably, the friction coefficient calculator 120 may calculate the packing stress using the following [Equation 5] and [Equation 6].
[수학식 5][Equation 5]
[수학식 6][Equation 6]
여기서, 
및 
은 각각 제1 패킹 응력 및 제2 패킹 응력, 
및 
은 각각 제1 패킹 마찰력 및 제2 패킹 마찰력, 
는 패킹-스템 마찰 계수, 
, 
, 
은 각각 밸브 스템 직경, 글랜드 직경 및 밸브 패킹 높이, 
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율을 의미하며, 
는 밸브 스템 직경 
, 글랜드 직경 
, 패킹-스템 마찰 계수 
및 패킹-본닛 마찰 계수 
에 의해 정의되는 계수(
)를 의미한다.here, and are the first packing stress and the second packing stress, respectively; and are the first packing friction force and the second packing friction force, respectively; is the packing-stem friction coefficient, , , are the valve stem diameter, gland diameter and valve packing height, respectively; is the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient The coefficient defined by ( ) means
마지막으로, 실제 마찰력 산출부(130)는 패킹-스템 마찰 계수 및 패킹 응력으로부터 관로를 흐르는 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출할 수 있다(S240).Finally, the actual frictional force calculator 130 may calculate the actual packing frictional force in consideration of the pressure due to the flow of the fluid flowing through the conduit from the packing-stem friction coefficient and the packing stress (S240).
바람직하게는, 실제 마찰력 산출부(130)는 하기 [수학식 7] 및 [수학식 8]을 이용하여 패킹-스템 마찰 계수 및 패킹 응력으로부터 실제 패킹 마찰력을 산출할 수 있다.Preferably, the actual frictional force calculator 130 may calculate the actual packing frictional force from the packing-stem friction coefficient and the packing stress using the following [Equation 7] and [Equation 8].
[수학식 7][Equation 7]
[수학식 8][Equation 8]
여기서, 
은 실제 패킹 마찰력이고, 
는 밸브 스템의 직경, 
는 패킹-스템 마찰 계수, 
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율, 
는 패킹 응력, 
은 밸브 패킹 높이이며, 
는 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율 
, 밸브 스템 직경 
, 글랜드 직경 
, 패킹-스템 마찰 계수 
및 패킹-본닛 마찰 계수 
에 의해 정의되는 계수이고, 
는 유동의 압력에 의한 상수로서 유동 압력에 의해 밸브 패킹의 접촉 압력의 감소를 고려하는 상수를 의미한다.here, is the actual packing friction, is the diameter of the valve stem, is the packing-stem friction coefficient, is the ratio of the gland stress in the axial direction to the gland stress in the radial direction, is the packing stress, is the valve packing height, is the ratio of the gland stress in the axial direction to the gland stress in the radial direction. , valve stem diameter , gland diameter , packing-stem friction coefficient and packing-bonnet friction coefficient is the coefficient defined by is a constant due to the pressure of the flow, which means a constant that considers the reduction of the contact pressure of the valve packing due to the flow pressure.
즉, 실제 마찰력 산출부(130)는 상기 [수학식 1] 내지 [수학식 6]에 의해 구해진 패킹-스템 마찰 계수 
와 패킹 응력 
를 상기 [수학식 7]에 대입하여 유동의 압력에 의한 상수 
를 구한 후, 패킹-스템 마찰 계수 
, 패킹 응력 
및 유동의 압력에 의한 상수 
를 상기 [수학식 6]에 대입하여 실제 마찰력 
을 산출할 수 있다.That is, the actual frictional force calculator 130 is the packing-stem friction coefficient obtained by [Equation 1] to [Equation 6] and packing stress is a constant by the pressure of the flow by substituting in Equation 7 above After finding the packing-stem friction coefficient , packing stress and constant by the pressure of the flow By substituting [Equation 6] above, the actual friction force can be calculated.
이와 같이, 본 발명의 일 실시예에 따른 밸브 패킹 마찰력 산출 방법의 경우, 밸브 스템과 밸브 액츄에이터가 실제 조립된 상태에서 정적 진단 시험을 수행하는 동안 측정된 패킹 마찰력 및 패킹 마찰력의 변화로부터 패킹-스템 마찰 계수 및 패킹 응력을 산출한 후, 이를 토대로 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출함으로써, 실제 밸브 스템과 밸브 엑츄에이터가 조립된 상태에서 동적 진단 시험을 수행하지 않고 정적 진단 시험에 의해 유동의 압력에 의한 실제 패킹 마찰력을 보다 용이하게 산출할 수 있다.As such, in the case of the method for calculating the valve packing friction force according to an embodiment of the present invention, the packing friction force and the packing friction force measured while the valve stem and the valve actuator are actually assembled while performing a static diagnostic test are obtained from the packing-stem After calculating the friction coefficient and packing stress, based on this, the actual packing friction force is calculated based on the pressure caused by the flow of the fluid. The actual packing friction force by the pressure of the flow can be more easily calculated.
또한, 정적 진단 시험을 수행하는 동안 측정된 패킹 마찰력 및 패킹 마찰력의 변화로부터 패킹-스템 마찰 계수뿐 만 아니라 패킹 응력도 함께 산출함으로써, 실제 밸브 스템과 밸브 엑츄에이터가 조립된 상태에서 동적 진단 시험을 수행하지 않고 정적 진단 시험에 의해 유동의 압력에 의한 실제 패킹 마찰력의 변화를 보다 정확하게 산출할 수 있다.In addition, by calculating the packing stress as well as the packing-stem friction coefficient from the changes in the packing friction force and the packing friction force measured during the static diagnostic test, a dynamic diagnostic test is not performed in the state where the actual valve stem and valve actuator are assembled. It is possible to more accurately calculate the change in the actual packing friction force due to the pressure of the flow by the static diagnostic test.
한편, 본 명세서와 도면에는 본 발명의 바람직한 실시예에 대하여 개시하였으며, 비록 특정 용어들이 사용되었으나, 이는 단지 본 발명의 기술 내용을 쉽게 설명하고 발명의 이해를 돕기 위한 일반적인 의미에서 사용된 것이지, 본 발명의 범위를 한정하고자 하는 것은 아니다. 여기에 개시된 실시예 외에도 본 발명의 기술적 사상에 바탕을 둔 다른 변형예들이 실시 가능하다는 것은 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에게 자명한 것이다.On the other hand, in the present specification and drawings, preferred embodiments of the present invention have been disclosed, and although specific terms are used, these are only used in a general sense to easily explain the technical content of the present invention and help the understanding of the present invention, It is not intended to limit the scope of the invention. It will be apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.
본 발명은 밸브 패킹 마찰력 산출 방법에 관한 것으로, 보다 상세하게는 밸브 스템과 밸브 액츄에이터가 실제 조립된 상태에서 동적 진단 시험을 수행하지 않고도 정적 진단 시험에 의해 유동의 압력에 의한 패킹 마찰력의 변화를 보다 용이하고 정확하게 산출할 수 있는 밸브 패킹 마찰력 산출 방법과 관련된 기술 분야에 적용 가능하다.The present invention relates to a method for calculating the friction force of a valve packing, and more particularly, the change in the friction force of the packing due to the pressure of the flow by a static diagnostic test without performing a dynamic diagnostic test in a state in which the valve stem and the valve actuator are actually assembled. It is applicable to the technical field related to the method of calculating the valve packing friction force that can be easily and accurately calculated.
Claims (7)
- 유입구와 배출구를 연결하는 관로가 형성된 밸브 몸체와, 상기 밸브 몸체의 내부에서 왕복 이동할 때에 상기 관로를 선택적으로 개폐하는 밸브 스템과, 상기 밸브 스템을 왕복 구동시키는 밸브 액츄에이터와, 상기 밸브 스템과 상기 밸브 몸체 사이의 기밀을 유지하는 밸브 패킹과, 상기 밸브 패킹을 상기 밸브 스템의 축 방향으로 가압하기 위한 글랜드(Gland)를 포함하는 밸브 조립체의 밸브 패킹 마찰력 산출 방법에 있어서,A valve body having a conduit for connecting an inlet and an outlet, a valve stem selectively opening and closing the conduit when reciprocating inside the valve body, a valve actuator reciprocating the valve stem, and the valve stem and the valve In the valve packing friction calculation method of a valve assembly comprising a valve packing for maintaining airtightness between the bodies, and a gland for pressing the valve packing in the axial direction of the valve stem,상기 밸브 스템과 상기 밸브 액츄에이터가 실제 조립된 상태에서 정적 진단 시험을 통해 상기 밸브 스템이 상기 관로를 폐쇄하는 닫힘 행정에서 제1 패킹 마찰력을 측정하는 단계;measuring a first packing friction force in a closing stroke in which the valve stem closes the conduit through a static diagnostic test in a state in which the valve stem and the valve actuator are actually assembled;상기 정적 진단 시험을 수행하는 동안, 상기 밸브 스템이 상기 관로를 개방하는 열림 행정에서 제2 패킹 마찰력을 측정하는 단계;measuring a second packing friction force in an opening stroke in which the valve stem opens the conduit while performing the static diagnostic test;상기 제1 패킹 마찰력, 상기 제1 패킹 마찰력에 대한 제1 패킹 마찰력 변화, 상기 제2 패킹 마찰력 및 상기 제2 패킹 마찰력에 대한 제2 패킹 마찰력 변화로부터 상기 밸브 패킹의 패킹-스템 마찰 계수 및 패킹 응력을 산출하는 단계; 및Packing-stem coefficient of friction and packing stress of the valve packing from the first packing friction force, the first packing friction change to the first packing friction force, the second packing friction force and the second packing friction force change to the second packing friction force. calculating ; and상기 패킹-스템 마찰 계수 및 상기 패킹 응력으로부터 상기 관로를 흐르는 유체의 유동에 의한 압력을 고려한 실제 패킹 마찰력을 산출하는 단계를 포함하는 것을 특징으로 하는 밸브 패킹 마찰력 산출 방법.and calculating an actual packing friction force in consideration of the pressure due to the flow of the fluid flowing through the conduit from the packing-stem friction coefficient and the packing stress.
- 제 1 항에 있어서,The method of claim 1,상기 제1 패킹 마찰력 및 상기 제2 패킹 마찰력을 측정하는 단계는,Measuring the first packing friction force and the second packing friction force,상기 밸브 스템에 설치된 스트레인 게이지에 의해 상기 제1 패킹 마찰력 및 상기 제2 패킹 마찰력을 측정하는 것을 특징으로 하는 밸브 패킹 마찰력 산출 방법.Valve packing friction force calculation method, characterized in that for measuring the first packing friction force and the second packing friction force by a strain gauge installed on the valve stem.
- 제 1 항에 있어서,The method of claim 1,상기 패킹-스템 마찰 계수 및 상기 패킹 응력을 산출하는 단계는,Calculating the packing-stem friction coefficient and the packing stress comprises:상기 제1 패킹 마찰력, 상기 제1 패킹 마찰력 변화, 상기 제2 패킹 마찰력, 상기 제2 패킹 마찰력 변화, 상기 밸브 스템의 직경, 상기 밸브 패킹의 상측에 구비된 글랜드의 직경 및 상기 밸브 패킹의 높이를 이용하여 상기 패킹-스템 마찰 계수 및 상기 패킹 응력을 산출하는 것을 특징으로 하는 밸브 패킹 마찰력 산출 방법.The first packing friction force, the first packing friction force change, the second packing friction force, the second packing friction force change, the diameter of the valve stem, the diameter of the gland provided on the upper side of the valve packing and the height of the valve packing The packing-stem friction coefficient and the packing stress are calculated by using the valve packing friction force calculation method.
- 제 3 항에 있어서,4. The method of claim 3,상기 패킹-스템 마찰 계수 및 상기 패킹 응력을 산출하는 단계는,Calculating the packing-stem friction coefficient and the packing stress comprises:상기 제1 패킹 마찰력 변화, 상기 제2 패킹 마찰력 변화, 상기 밸브 스템의 직경 및 상기 글랜드의 직경을 이용하여 상기 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출하는 단계; 및calculating the packing-stem friction coefficient and the packing-bonnet friction coefficient using the change in the first packing friction force, the change in the second packing friction force, the diameter of the valve stem, and the diameter of the gland; and상기 제1 패킹 마찰력, 상기 제2 패킹 마찰력, 상기 패킹-스템 마찰 계수 및 상기 패킹-본닛 마찰 계수를 이용하여 상기 패킹 응력을 산출하는 단계를 포함하는 것을 특징으로 하는 밸브 패킹 마찰력 산출 방법.and calculating the packing stress using the first packing friction force, the second packing friction force, the packing-stem friction coefficient, and the packing-bonnet friction coefficient.
- 제 4 항에 있어서,5. The method of claim 4,상기 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출하는 단계는,Calculating the packing-stem friction coefficient and packing-bonnet friction coefficient comprises:하기 [수학식 1] 내지 [수학식 4]를 이용하여 상기 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수를 산출하는 것을 특징으로 하는 밸브 패킹 마찰력 산출 방법.A valve packing friction calculation method, characterized in that the packing-stem friction coefficient and the packing-bonnet friction coefficient are calculated using the following [Equation 1] to [Equation 4].[수학식 1][Equation 1]
[수학식 2][Equation 2]
[수학식 3][Equation 3]
[수학식 4][Equation 4]
여기서,및
은 각각 제1 패킹 마찰력 변화 및 제2 패킹 마찰력 변화,
및
는 각각 패킹-스템 마찰 계수 및 패킹-본닛 마찰 계수,
,
,
은 각각 밸브 스템 직경, 글랜드 직경 및 밸브 패킹 높이,
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율,
는 패킹 응력 변화를 의미하며,
및
은 각각 닫힘 행정 및 열림 행정에서 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율
, 밸브 스템 직경
, 글랜드 직경
, 패킹-스템 마찰 계수
및 패킹-본닛 마찰 계수
에 의해 정의되는 계수임.here,
andis the change in the first packing friction force and the change in the second packing friction force, respectively;andare the packing-stem friction coefficient and packing-bonnet friction coefficient, respectively,,,are the valve stem diameter, gland diameter and valve packing height, respectively;is the ratio of the gland stress in the axial direction to the gland stress in the radial direction,is the change in packing stress,andis the ratio of the gland stress in the axial direction to the gland stress in the radial direction in the closing stroke and opening stroke, respectively., valve stem diameter, gland diameter, packing-stem friction coefficientand packing-bonnet friction coefficientIt is a coefficient defined by . - 제 4 항에 있어서,5. The method of claim 4,상기 패킹 응력을 산출하는 단계는,Calculating the packing stress comprises:하기 [수학식 5] 및 [수학식 6]을 이용하여 상기 패킹 응력을 산출하는 것을 특징으로 하는 밸브 패킹 마찰력 산출 방법.A valve packing frictional force calculation method, characterized in that the packing stress is calculated using the following [Equation 5] and [Equation 6].[수학식 5][Equation 5]
[수학식 6][Equation 6]
여기서,및
은 각각 제1 패킹 응력 및 제2 패킹 응력,
및
은 각각 제1 패킹 마찰력 및 제2 패킹 마찰력,
는 패킹-스템 마찰 계수,
,
,
은 각각 밸브 스템 직경, 글랜드 직경 및 밸브 패킹 높이,
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율을 의미하며,
는 밸브 스템 직경
, 글랜드 직경
, 패킹-스템 마찰 계수
및 패킹-본닛 마찰 계수
에 의해 정의되는 계수(
)임.here,
andare the first packing stress and the second packing stress, respectively;andare the first packing friction force and the second packing friction force, respectively;is the packing-stem friction coefficient,,,are the valve stem diameter, gland diameter and valve packing height, respectively;is the ratio of the gland stress in the axial direction to the gland stress in the radial direction,is the valve stem diameter, gland diameter, packing-stem friction coefficientand packing-bonnet friction coefficientThe coefficient defined by ()lim. - 제 1 항에 있어서,The method of claim 1,상기 실제 패킹 마찰력을 산출하는 단계는,The step of calculating the actual packing friction force,하기 [수학식 7] 및 [수학식 8]을 이용하여 상기 패킹-스템 마찰 계수 및 상기 패킹 응력으로부터 유동을 고려한 상기 실제 패킹 마찰력을 산출하는 것을 특징으로 하는 밸브 패킹 마찰력 산출 방법.A valve packing friction calculation method, characterized in that the actual packing friction force is calculated in consideration of the flow from the packing-stem friction coefficient and the packing stress using the following [Equation 7] and [Equation 8].[수학식 7][Equation 7]
[수학식 8][Equation 8]
여기서,은 실제 패킹 마찰력이고,
는 밸브 스템의 직경,
는 패킹-스템 마찰 계수,
은 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율,
는 패킹 응력,
은 밸브 패킹 높이이며,
는 축 방향의 글랜드 응력과 직경 방향의 글랜드 응력의 비율
, 밸브 스템 직경
, 글랜드 직경
, 패킹-스템 마찰 계수
및 패킹-본닛 마찰 계수
에 의해 정의되는 계수이고,
는 유동의 압력에 의한 상수로서 유동 압력에 의해 밸브 패킹의 접촉 압력의 감소를 고려하는 상수임.here,
is the actual packing friction,is the diameter of the valve stem,is the packing-stem friction coefficient,is the ratio of the gland stress in the axial direction to the gland stress in the radial direction,is the packing stress,is the valve packing height,is the ratio of the gland stress in the axial direction to the gland stress in the radial direction., valve stem diameter, gland diameter, packing-stem friction coefficientand packing-bonnet friction coefficientis the coefficient defined byis a constant due to the pressure of the flow, which is a constant that considers the decrease in the contact pressure of the valve packing due to the flow pressure.
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|---|---|---|---|---|
| KR860000552A (en) * | 1984-06-19 | 1986-01-29 | 지. 씨. 도어먼 | Leak measuring device of valve packing |
| JPH11258115A (en) * | 1998-03-09 | 1999-09-24 | Nikkiso Co Ltd | Valve packing testing device |
| JP2005083504A (en) * | 2003-09-09 | 2005-03-31 | Kansai Electric Power Co Inc:The | Maintenance management system for motor valve system |
| KR20130017885A (en) * | 2011-08-12 | 2013-02-20 | 한국수력원자력 주식회사 | The test equipment of friction coefficient of valve packing and method thereof |
| KR101678029B1 (en) * | 2015-08-28 | 2016-11-21 | 한국기계연구원 | Air operated valve actuator simulating apparatus |
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| DE10040114A1 (en) * | 2000-08-17 | 2002-02-28 | Bosch Gmbh Robert | Connection between a shaft end of a gas exchange valve of an internal combustion engine and an actuator of a valve actuator |
| JP3779658B2 (en) * | 2002-09-05 | 2006-05-31 | 日本原子力発電株式会社 | Gland packing performance diagnostic equipment for control valves |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR860000552A (en) * | 1984-06-19 | 1986-01-29 | 지. 씨. 도어먼 | Leak measuring device of valve packing |
| JPH11258115A (en) * | 1998-03-09 | 1999-09-24 | Nikkiso Co Ltd | Valve packing testing device |
| JP2005083504A (en) * | 2003-09-09 | 2005-03-31 | Kansai Electric Power Co Inc:The | Maintenance management system for motor valve system |
| KR20130017885A (en) * | 2011-08-12 | 2013-02-20 | 한국수력원자력 주식회사 | The test equipment of friction coefficient of valve packing and method thereof |
| KR101678029B1 (en) * | 2015-08-28 | 2016-11-21 | 한국기계연구원 | Air operated valve actuator simulating apparatus |
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