WO1993019317A1 - Process and device for testing the operability of a valve or fitting driven a motor element - Google Patents

Process and device for testing the operability of a valve or fitting driven a motor element Download PDF

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Publication number
WO1993019317A1
WO1993019317A1 PCT/EP1993/000641 EP9300641W WO9319317A1 WO 1993019317 A1 WO1993019317 A1 WO 1993019317A1 EP 9300641 W EP9300641 W EP 9300641W WO 9319317 A1 WO9319317 A1 WO 9319317A1
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WO
Grant status
Application
Patent type
Prior art keywords
spindle
characterized
valve
torque
test
Prior art date
Application number
PCT/EP1993/000641
Other languages
German (de)
French (fr)
Inventor
Klaus Fischer
Original Assignee
Elektro-Mechanik Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00Apparatus for, or methods of, measuring force, e.g. due to impact, work, mechanical power, or torque, adapted for special purposes
    • G01L5/0061Force sensors associated with industrial machines or actuators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0083For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters

Abstract

In a valve or fitting with a spindle which is adjustable by a motor element via a torque, the operability of the valve or fitting is tested by applying an additional test force. The coefficients of friction of the valve or fitting are found from the different torque or driving force required at different test forces for driving the spindle.

Description

Method and device for testing the Funktionsfähiσkeit a driven by an actuator valve

The invention relates to a method and an apparatus for testing the operability of a valve, in particular for determining the coefficient of friction and the forces occurring on a valve stem; which is adjustable by an actuator by means of a torque.

In nuclear power plants equipment such as valves, gate valves and valves required for blocking pipes, wherein the fitting for safety reasons in the case of demand zuver¬ must operate permeable. In the conversion of the driving torque in the example for actuation. Of the valve head of a valve required spindle longitudinal force play, the state of the gland which surrounds the spindle and seals, the state of the spindle nut, on which the driving torque is applied, and with remote operator of the remote drive efficiency of an essential for valves Role.

If the gland clamped too tightly, so such a large frictional force may arise that although the valve operates at wieder¬ periodic inspections without malfunction, but a sufficient force is not available under certain circumstances on demand at high line pressure. Another major significance of the spindle nut friction. If the Reibungskoeffi¬ coefficient of the spindle nut is too low, then the tap when tripping of the torque switch of actuator motor when it turns off when the set torque being damaged by the occurring torque peaks. If the coefficient of friction of the spindle nut and the gland is too high, is on demand is a risk that the valve does not work properly.

The object of the invention is based Over a method vor¬ by means of which can be checked the functionality of an armature, and the friction coefficient can be determined in particular, as well as an apparatus for performing the method.

This object is inventively achieved by a method in which a test force is applied to the spindle during the adjustment movement of the spindle of the valve, wherein power from the union unter¬ different torque or the different drive input, the or at different load values ​​for the drive of the spindle, the friction coefficient of the fitting or the actually acting on the spindle force is required to be determined.

Depending on the results of such a test of a valve, remedial measures to derArmatur can be made in good time so that there is no longer a risk of malfunction in case of demand.

Advantageous embodiments of the invention are set forth in the claims and in the following description.

For example explains embodiments of the Erfindungwerdennachfolgend reference to the drawing. Show it

Fig. 1 shows schematically a valve with an inventive

Measuring device, Fig. 2 shows the course of driving torque test force and

Coefficient of friction over time in a fitting, Fig. 3 shows another embodiment of the measuring device, Fig. 4 is a diagram of drive power and test load, Fig. 5 a further illustration of the test force in conjunction with the restoring force reserve and Fig. 6 shows another embodiment of the measuring device ,

In Fig. 1 a is arranged in a pipe 1 Valve 2 is shown schematically as a valve, the spindle 5 in the opening or the Schlie߬ can be adjusted by an actuator 3 shown position. The spindle 5 of this fitting is provided with a thread with which a nut 4 is engaged. The spindle nut 4 is rotated by a not shown electric motor of the actuator 3 via a transmission in rotation so that the spindle is displaced in the axial direction. 5 A stuffing box 6, in which the spindle 5 is displaced, seals the pipe 1 from relative to the outer area. This construction of a valve is known per se.

According to the invention a measuring device 7 is mounted on such a fitting, comprising a mounted on the free end of the spindle 5 pistons 8 in the illustrated embodiment, which is ver¬ slidable in a container filled with hydraulic fluid cylinder 9 to a fixed point 10 via a .Kraftmeß ¬ device 11 is supported. Between the upper and lower cylinder chamber 13 and 14, a connecting line 12 is provided, in which a throttle valve 15 is arranged, whose Drosselquer¬ section through an adjustment device 20 can be changed.

At 16, a signal output of the force measuring device 11 is angedeu¬ tet, which is connected to a display device 17, such as a storage oscilloscope. Conveniently, the signal output 16 is also connected to a data processing device 18, which communicates with a memory 21 and the Actuator 20th The actuator 3 is connected to a device 22 for measuring the pressure exerted by the actuator torque, which is also connected to a memory 23 in connection.

When the valve 2 by engaging on the spindle nut 4 of the torque actuator .; 3 is opened, the piston displaces 8 hydraulic fluid from the cylinder chamber 13 via the throttle 15 in the line 12 14 in the cylinder space Here, the cylinder is pressed with a certain pressing force against the fixed point 10 9 depending on the opening degree of the throttle 15 °. This pressure force with which the cylinder 9 presses ge against the fixed point 10, can be adjusted via the throttle 15 and the measuring device 11 Kraft¬ be measured. This compressive force corresponds to a test load P, engages coaxially to the spindle. 5

During the measuring process, if the operating pressure prevails in the line 1, preferably in the vicinity of the open position of the valve from a point x to a time t 2 on the one hand the force exerted by the actuator 3 torque M as a measurement function M = M (t) of the device 22 and measured in the memory 23 is stored, while on the other hand, via the signal output 16 of the test force P as measurement function P = P (t) is displayed on the display device 17 and is stored on the data processing device 18 in the memory 21st During the adjustment movement of the piston 8 in the cylinder 9 by changing the throttle opening in the throttle 15, the test force P according to a predetermined Meßfunk ion P = P (t) is changed, the processing device from a file 19 in the Datenverarbei¬ can be read 18, which provides steep device via the Ver¬ 20, the throttle 15 ver¬ in a corresponding manner. Such a predetermined measurement function can be compared during Meßvor¬ gear using the measuring function P = P (t). In this measurement function Abwei¬ deviations from the predetermined Prüfkraftkenn¬ line over a predetermined tolerance addition can be corrected 15 by the data processing means 18, the measurement function P = P (t) over the Actuator 20 and the throttle.

Since the torque M and the test force P are known, by at a pressure = 0 in the pipeline 1 the Spindelbeiwert C

M x

Spindle force F sp = - = R + P x (1) and

CM,

= R + P, (2)

about

Figure imgf000007_0001

M 2 - M 1

C = (4)

P 2 - P,

are calculated, where R is the fabric sleeve force required to overcome the friction of the stuffing box.

Out

2 • C • n • F • d ~ d cosγ F • h • μ = cosγ (5) π • d 2 + 2 F - C • h

the coefficient of friction μ of the spindle nut 4 can be determined, where d F of the flank diameter of the thread h, the thread pitch and corresponds cosγ half the flank angle of the thread.

Fig. 2 schematically shows the course of the test force P and the torque M over time t and the ermittel¬ in this manner th coefficient of friction μ of the spindle nut 4 and the stuffing buchsenreibkraft R. While the gland friction at different test loads P to be substantially constant shows the spindle nut friction changes depending on the test load. It depends on the wing loading and the lubrication state of the thread.

To determine the magnitude of the friction coefficient of the spindle nut, it may be sufficient if sequentially two different test are applied rafts, or with a certain test force and thereby the torque required is measured without test load.

The evaluation can be performed in the data processing device 18 due to the data stored in the memories 21 and 23 measured values ​​or on the basis of the stored measured values ​​in a separate data processing device.

In determining the coefficient of friction of the nut to the given boundary conditions, such as pressure in the line 1 and weight of the spindle 5 at the different test loads P are taken into account.

According to an advantageous embodiment, the change of the test force P during a displacement stroke of the valve at short time intervals can be measured, whereupon the Einzelmeßsignale be stored as a control function and / or displayed. This makes it possible to achieve a reliable detection and storage of the control function-forming measurement values ​​within the predetermined measurement time in spite of a limited data processing speed of the data processing device 18th

Instead of a piston 8 with a cylinder 9, a spring between the spindle end and force measuring device 11 can be disposed. During the adjusting movement of the spindle 5 by the actuator 3, the characteristic of the spring or the spring assembly entsprechen¬ a test force P as a function of distance or time, which can be measured via the signal output 16 of the force-measuring device 11 results accordingly.

, A plurality of cylinder 9 or more spring packets are positioned around the spindle between the gland and the actuator with each cylinder or spring package a Kraftme߬ associated device. In this embodiment, the cylinders or springs are arranged around the spindle, that the resultant test force P is located on the spindle axis. The Feder¬ packages may be interchangeable to change the test force. The spring characteristic range can be changed by a Federverstelleinrich¬ tung.

Fig. 3 shows another embodiment of the measuring device, wherein the cylinder 9 is supported directly on the fixed point 10 and in each case a pressure gauge 24 is provided on both sides of reactor 15. The two pressure gauges are connected to the Datenverarbeitungsein¬ direction 18 so that the test force P can be determined on the detected pressure in the two cylinder chambers 13 us fourteenth

Fig. 3 shows a spool 2 having a penetrating into the pipeline 1 pusher plate 25 in place of the wiederge¬ given in Fig. 1 the valve disc. Further, a spring wedge wie¬ dergegeben at 26, by means of which the spindle nut 4 is connected to the actuator 3 and the herausnehm¬ for dissolving this compound is bar.

At 27 the electric drive motor of the actuator 3 is schematically indicated, which is connected to a device 28 Ziirn measuring the power of the drive motor. This device 28 is connected to a data processing device 29th At 30 is a switch for switching off the power supply to the drive motor An¬ reproduced 27th Between the drive motor 27 and actuator 3, a torque switch 31 is provided which is set to a specific torque value, is switched off on reaching which the drive motor 27 via the switch 30th

With the measuring device of FIG. 3, the drive power L is used instead of the torque M = L (t) of the drive motor 27 as Funk¬ tion time at 28 measured .. While the torque is measured at the valve, the driving power far from the fitting are measured in the control room. To measure the Stopfbuchsenreibkraft the An¬ is first drive power L 0 of the drive motor without a connection with the spindle nut 4 by removing the spring wedge 26, that is, the idle power is measured. Then, the drive power ^ is measured when the actuator 3 by the spring wedge 26 is connected to the spindle nut 4 and engages no test load. Thereupon, the drive power L 2 is measured when a test load P 2 loads the spindle which is in the order of Stopfbuchsenreibkraft. the spindle nut friction coefficient can force change in this region of low test are considered to be constant.

Fig. 4 shows in L 0, the driving power of the drive motor without spindle nut 4, which is constant over time and at ^ the drive power ^ with the spindle nut 4 when the Spindelmut¬ ter 4 connected to the actuator 3 and the test force P x = 0 , At t 2, a test load P 2 engages, which increases the drive power to L2.

If no pressure prevails in the pipeline 1 and the flow medium at rest, the difference L ^ is - L 0 is a measure of the Stopf¬ buchsenreibkraft in the axial direction of the spindle. To this Leistun¬ gswert L- L - to implement in the Stopfbuchsenreibkraft L 0, the test force P 2 is applied so that a Leistungserhö¬ be hung from L to L x 2 is equal to ^ - L 0 is obtained. The power increase of L-L to L 2 is proportional to the Prüfkrafterhöhung of P x at P2. A test load P x which corresponds to the desired Stopfbuchsenreibkraft as shown in Figure 4 - it brings the idle power in hood, so corresponds to the power value of L = L ^ j + (L 0 L j ^).. The spindle nut efficiency remains not considered here because it is the same for L x and L2. The entire, acting on the spindle longitudinal force is composed of the Stopfbuchsenreibkraft and the test force, the frictional force Stopfbuchsen¬ is determined by a value of the drive power that is required to overcome the Stopfbuchsenreibkraft. Here, this power value is expressed in form of a corresponding test force. After determining the Stopfbuchsenreibkraft Abschaltdrehmoments of the torque switch 31 and the associated test force P of Spin¬ can be determined by Equations 1 delmutter 4 and 5 under Zuhilfen¬ imitate the coefficient of friction μ.

Referring to FIG. 5 explains how safety wich¬ term fittings can be checked if they are designed correctly in the case of requirements. The parallel to the time axis t ver¬ current reserve force F st is the force that is at the location 32 at the bottom of the stuffing box 6 is available. The reserve force is substantially equal to the test force P, which occurs when the torque switch pressure at a Leitungs¬ off 0 and stationary line medium. The Stellkraft- reseve F st is obtained in that the torque switch 31 of the switch 30 for the power supply of the drive motor opens upon occurrence of the maximum allowable torque 27 is set to the maximum allowable torque that known on the through calculate the rigidity, weakest may attack link in the distribution chain An¬. A set in this way, torque switch prevents at periodic tests the operability of the valve is compromised when, for example, a commonly the Dremomentschalter 31 upstream, not shown limit switches fails, the abschaltete the motor on reaching a certain stroke position of the valve.

This measure can be achieved that sicherheitstech¬ cally important, and already in operation valves are not overloaded in terms of their strength.

In addition, when Wegendschalterversagen to be examined, can be used for simulation of the end stop of the valve or to Simu¬ lation a stroke limiter a valve disposed in series with the throttle valve 15 in the conduit 12. Solenoid valve wer¬ 33 is provided to, by which the line can be shut off 12, so that the piston 8 can no longer displace hydraulic fluid through conduit 12, and as will be held by a stop in position. In this case, the maximum possible by the set torque, is decisive for the strength, acting on the spindle forces on the pressure gauge 24 or the force-measuring device 11 can be measured.

Furthermore, the Rei¬ can by means of the measuring device of FIG. 3 bung coefficient of the slide plate 25 of the slider 2 are determined when both sides of the slide plate 25 in the processing Rohrlei¬ 1, a known pressure difference Ap is present. For this purpose, the measurement functions of the reserve force F of the test force P (t) and the differential pressure Ap (t) εt used.

The difference between the force reserve F εt and Prüf¬ force P at a time t x is about 5 to 10% before the end of the stroke, when the torque switch responds 31, the frictional force is at the vorhan¬ which differential pressure Ap (in spindle longitudinal direction on the slide plate 25 t x). This frictional force is under Be¬ the boundary conditions of the accident into account a measure of the functional capability of the valve on demand.

The plate friction is given by

Εt F - P (t x) - F AUEF Plattenreibkraft = F p d = D 2 a / 4 • Ap (t x) • μ plate

where d D of the seal diameter of the sealing plate and

F = ^ ΛUF Spi n de l 2 * π / 4 * p S, that is the pressure force acting on the spindle in the opening direction by the line pressure PS.

Fig. 6 shows schematically a further embodiment of the measuring device for a valve in which a valve flap, not shown, is rotated slowly by the rotary spindle. On the spindle 5, a lever 35 is secured, the applied sei¬ nem free end of the piston. 8 Here, the torque occurring at the spindle 5 M of the test force P times length of the lever can be found in the 35th The test force can be measured as in Fig. 1 by a force-measuring device or, as in Fig. 3 by the pressure in the cylinder spaces. In this measuring device according to Fig. 6, the test force is increased until the torque switch responsive 31st In this way, the actually occurring at the valve spindle torque can be measured, regardless of the efficiency of a transmission of the actuator. 3

Instead of the piston 8 with cylinder 9, a spring with force measuring device 11 may be provided for applying a test force.

Claims

claims
1. A method for testing the operability of a valve with a spindle that is adjustable by an actuator by means of a torque, characterized in that an additional test force is applied to the spindle, and that from the different torque or unter¬ different advanced drive performance, or which is required in verschiede¬ NEN proof load for driving the spindle, the friction coefficient of the armature determines the wer¬.
2. The method according to claim 1, characterized in that the test force changed continuously or stepwise verän¬ and the required driving torque and the required driving power is continuously recorded or schrit¬ tweise.
3. The method according to claim 1, characterized in that the test force is increased until the Drehmoment¬ switch off the valve, and the test load occurring is measured.
4. The method according to claim 1, characterized .gekennzeichnet that the test force is applied coaxially to the spindle axis.
5. Ahren Ver according to claim 1, characterized in that the raft test is applied as a torque about a lever axis transverse to Spindellängs-.
6. Apparatus for carrying out the method of claim
1, characterized in that on the spindle (5) of the valve means (9; 35) for applying a variable test load on the spindle is provided, and that a means for measuring the test load and a
Means is provided for measuring the drive power or the required torque for the spindle movement.
7. The device according to claim 6, characterized in that the spindle with at least one piston (8) is connected, which is displaceable in a container filled with hydraulic fluid Zylin¬ of (9), wherein the cylinder chambers beider¬ sides of the piston via a line ( 12) are connected with a throttle (15), and that the cylinder (9) to a fixed point (10) is supported.
8. Apparatus according to claim 7, characterized in that between the cylinder (9) and the fixed point (10) a device is provided Kraftme߬ (11).
9. Apparatus according to claim 7, characterized in that pressure gauge (24) on the conduit (12) are provided for determining the test load on the pressure in the cylinder.
10. Apparatus according to claim 6, characterized in that between the spindle (5) and a fixed point (10) a spring is provided wenig¬ least, the measuring means over a Kraft¬ supported on the fixed point (10).
PCT/EP1993/000641 1992-03-18 1993-03-18 Process and device for testing the operability of a valve or fitting driven a motor element WO1993019317A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DEP4208667.1 1992-03-18
DE19924208667 DE4208667A1 (en) 1992-03-18 1992-03-18 Determining transmission friction of adjustable fitting - e.g. valve in nuclear power station
DE19924224902 DE4224902A1 (en) 1992-03-18 1992-07-28 Method for determining the spindle nut and Stopfbuchsreibung of valves with electric actuator and measuring arrangement for carrying out the method
DEP4224902.3 1992-07-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748970A2 (en) * 1995-06-13 1996-12-18 ARI-ARMATUREN ALBERT RICHTER GmbH & Co.KG. Method and apparatus to dampen the valve lift of a spring-loaded valve
WO1997044645A2 (en) * 1996-05-21 1997-11-27 L-Plan, Podjetje Za Projektiranje, Meritve In Prodajo, D.O.O. Device for testing safety valves

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19512238A1 (en) * 1995-03-31 1996-10-02 Istec Gmbh A method for monitoring and operation of particular motor-driven valves
DE19643096C2 (en) * 1995-10-20 1999-11-18 Preussag Wasser Und Rohrtechni Apparatus and method for measuring spindle forces on fittings

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542649A (en) * 1983-07-19 1985-09-24 Charbonneau And Godfrey Associates Motor operated valve analysis and testing system
US4831873A (en) * 1986-04-04 1989-05-23 Movats Incorporated Method and apparatus for remote monitoring of valves and valve operators
US5174152A (en) * 1991-03-06 1992-12-29 Wohld Peter R Power operated valve stem thrust verification test system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542649A (en) * 1983-07-19 1985-09-24 Charbonneau And Godfrey Associates Motor operated valve analysis and testing system
US4831873A (en) * 1986-04-04 1989-05-23 Movats Incorporated Method and apparatus for remote monitoring of valves and valve operators
US5174152A (en) * 1991-03-06 1992-12-29 Wohld Peter R Power operated valve stem thrust verification test system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748970A2 (en) * 1995-06-13 1996-12-18 ARI-ARMATUREN ALBERT RICHTER GmbH & Co.KG. Method and apparatus to dampen the valve lift of a spring-loaded valve
EP0748970A3 (en) * 1995-06-13 1997-11-26 ARI-ARMATUREN ALBERT RICHTER GmbH & Co.KG. Method and apparatus to dampen the valve lift of a spring-loaded valve
WO1997044645A2 (en) * 1996-05-21 1997-11-27 L-Plan, Podjetje Za Projektiranje, Meritve In Prodajo, D.O.O. Device for testing safety valves
WO1997044645A3 (en) * 1996-05-21 1998-01-22 Plan Podjetje Za Projektiranje Device for testing safety valves

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Publication number Publication date Type
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