JPS60500185A - instrument tester - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] instrument tester The present invention provides a rotating flow system that produces a high electrical current with respect to an increase in rotation, for example. This invention relates to a meter tester used to test quantity meters. The number of pulses per unit product is , the evacuation of the meter specified as the K factor, and the purpose of the meter tester is to The purpose is to enable the calibration of factors. The instrument tester is mainly used to measure oil flow rate. The accuracy of the factor applied to and determined for the split mold must be at least 0.02%. required.

Traditional meter testers use precisely sized pipes between fixed detectors. The movement of the ball along the axis was used to discharge a known volume of fluid. total The volume of fluid discharged by the instrument tester flows in series through the instrument being tested. , the number of pulses that occur on the instrument while the ball moves between the detectors is counted and factors are determined. Since high accuracy is required, it is necessary to increase the discharge amount. Also, it was not appropriate for Rei to use a 20 meter long measuring instrument.

Making the instrument tester such a size means that there is no need for an oil ring or a restricted space T. , it is clearly difficult to implement when considering the throat. Therefore compact instrument tester Efforts have been made to develop. Instrument inspection using electrical pulse processing technology By improving the inherent accuracy of This makes it possible to reduce the amount of emissions required, and has a path on the order of 1 meter. It became possible to construct an instrument tester in the form of a piston shilling mechanism.

With the piston type instrument tester, what happens after the piston inspection process is completed? It is difficult to return the piston to its initial position. To solve and centralize this problem , cable and winch assembly (e.g. as disclosed in French Patent No. 2,471,590) ) or a separate return piston operated by compressed gas (as described in British Patent No. 202). Various mechanisms have been proposed, such as those disclosed in US Pat. No. 3,295.

This additional return mechanism also creates some impedance during the inspection process. to ensure that the piston is completely and reliably returned to its initial position in a timely manner during the next inspection step. It needs to be carefully controlled so that it can come back. So these instrument testers is relatively expensive. Furthermore, by providing a return mechanism, the causes of failure are increased. I will be able to do it.

For other instrument testers, return the piston by reversing the flow in the shilling. There is something like this. Therefore, these instrument pistons move This means that inspection can be performed in two directions. This type of instrument tester is It can be called a two-way tester as opposed to a one-way tester that has a separate return mechanism. Ru. If the two-way tester is connected in alignment with the operating instrument, the four-way Provide a lube to allow the flow through the tester to flow backwards and around the tester. It is necessary to enable a binocular flow. When using a 4-way valve For example, block and bleed techniques It is necessary to carefully monitor the information using tools such as hnlclue to avoid any omissions. be. A 4-way valve with a block/bleed machine, however, is It is evil. Additionally, two-way testers have other problems. That is, detection, control The control and processing system is operable in two opposite directions of inspection. It has to be. This makes instrumentation testers more complex and more expensive. shall be taken as a thing.

The purpose of the present invention is to provide a compact, highly reliable, and relatively inexpensive instrument tester. It's about serving.

The instrument tester according to the present invention is a meter for testing instruments connected to a fluid flow path 1. A testing device comprising: an inspection hole; a sealingly engaged part of the inspection hole and a movement along the inspection hole; a movable piston; placing the inspection hole in parallel with a portion of the flow path that does not include the meter; means for connecting; fluid selectively passes through the inspection hole or the parallel flow path section; bypass pulp means operable to enable the piston to Move the test stroke to eject a known volume of fluid in sync with the flow along the test hole. In an instrument tester where it is possible: the piston has completed its test stroke. When the fluid starts to flow through the parallel flow path section after the The fluid pressure acting on the downstream surface becomes substantially equal (-), thereby increasing the The above-mentioned direction of the above-mentioned piston is adjusted so that the ton returns toward the upstream 1β11; The effective area in one span of 1 is smaller than the effective area in the surface of the downstream jiill. It is characterized by being carved.

Preferably, the test hole is defined by a test sill extending within the hollow cylindrical shell. The shell and the inspection cylinder are connected only to the ends of the inspection hole in the axial direction. Assume that they are interconnected.

4 Preferably, the test cylinder has a flow f:r-population means adjacent to each of its ends. and a fluid outlet means, said shell having said fluid inlet means of said test cylinder. The end remote from the stage (2) is provided with fluid inlet means, by which the instrument is connected. When the fluid passing through the tester enters the test hole, there is a connection between the shell and the test cylinder. The flow is assumed to be along the annular gap between the two.

In this way, the outside of the inspection hole is exposed only to the fluid and may be at a different temperature. It is not exposed to the solder enclosing member. Furthermore, the inspection cylinder is subject to large fluid pressure differentials. It is possible to obtain the necessary structural stability even with a relatively weak structure.

The piston gets stuck, causing a temporary increase in fluid pressure, which causes the instrument tester and everything connected to it to Piston-type gauges may cause serious damage to This is a common drawback of testers. If a relief valve is installed in series with the instrument tester, If possible, to eliminate leakage, the relief valve should be connected to the instrument test AIR itself. It must have the same tolerance. Furthermore, the leakage situation during use Separate processing is required to monitor. Therefore, such a relief valve Providing a tube increases manufacturing costs and complicates operation.

Therefore, another purpose of non-invention is to prevent problems caused by piston catching. An improved meter tester that can be used without complicating normal operation. It is about providing.

In this regard, the invention provides a cylinder having an inspection hole, and a seal with the inspection hole. mounted in the cylinder so as to be able to engage with the cylinder and move along the inspection hole. In an instrument tester containing a piston, the two pistons are axially connected to each other. It can be divided into W possible radial inner 11111 part and half outward direction ii! Equipped with 11 parts The separation movement of the radially inner and outer portions is When the force exerted by the fluid on the piton exceeds a predetermined threshold, usually by at least one element adapted to deform or destroy A meter tester is provided which is specially limited to:

According to this preferred embodiment of the invention, the piston hooking t increases the fluid pressure. At most one or more pistons holding the two piston parts together The piston is sheared, and the radially inner piston portion It can move with the flow away from the stone section. Therefore, the fluid is radial flows through the piston section of the outward a+++, causing fluid pressure to reach dangerously high levels. can be prevented from rising.

The invention will be explained below by way of example with reference to the accompanying drawings, in which: FIG. Each drawing The contents are as follows.

FIG. 1 is a sectional view of a part of the test instrument according to the present invention.

FIG. 2 is a detailed view of the part shown in FIG. 1.

FIGS. 3a) to ial are a series of diagrams showing the installation and operating conditions of the meter tester.

FIG. 4 is an enlarged fragmentary view of the portion shown in FIG. 2.

Figure 5 is a cross section showing a part of the meter tester that is different from the part of the meter tester shown in Figure 1. Figure 2 is shown axially connected to the portion of Figure 1;

FIG. 6 is a 6-6 sectional view in FIG. 5.

Figure 7 shows another form of piston for use in the instrument tester shown in Figure 1. Cross-sectional view.

FIG. 8 is a detailed sectional view showing yet another modification flj.

Referring to FIG. 1, the instrument tester includes a pair of end plates 1012 and two , a generally cylindrical shell 14 extends between them. The shell 14 has an end plate It has a partially flanged end 16 having the same diameter as the diameter of the flange. This flange end The portion 16 is connected to each other by a plurality of bolts arranged at equal intervals around the periphery and around the rod portion. Fixed to the end plate. The shell 14 has a fluid inlet near the end plate 12. It is equipped with an entrance (s knee) 18. This end plate 12 has a fluid outlet hole and A central hole 20 is provided which serves as a.

The central portion 24 has a uniform thickness, and the upstream side portion 24 has an appropriate shape ((formed A laterally strained sill 22 having a downstream end portion 26. It is installed in the form of a shaft.

This cylinder abuts two end plates, one at each end. It is radially arranged by two repositioning rings 30 arranged. Siri The central portion of the undercarriage constitutes an internal inspection hole 32.

The upstream end portion 26 has an internal circular groove defining a bypass chamber 34 . child The bypass chamber 34 is shown enlarged in FIG. shilling end Four holes 36 arranged at equal intervals around the circumference of the portion 260 form a bypass chamber 34 and a shell. 14 and an annular gap between the cylindrical central portion 24. Opposition The side end portions 28 are provided with an internal circumference (spine) having a generally regular shape. This circumference/mouth constitutes the downstream bath chamber 39.

A piston 40 is slidably mounted along the cylinder. Hyoston 40 is a hollow cylindrical shape extending through the central hole of the end plate, 14; It has a piston rod 42 having a shape. A more detailed diagram of Kanji is shown in Figure 2. ・7th, the piston has a bulb-shaped piston rod head lI with an outer collar. It is equipped with 6. This outer collar 48 has a series extending coaxially with the piston rod. It supports a round piston wall 50. On the downstream side of the collar 48 (first (right side in the figure), the piston wall has four holes 52 equally spaced around its circumference. Ru. Upstream of the collar 48, the piston wall has four further holes 5.1. have. The hole 54 further from the collar is of the same size as the hole 52 and The dimension of the hole 56 nearer to the axial direction is made shorter. Figures 2 and 4 In the best illustrated piston wall 50, the support collar 48 has a position f2. An annular groove 51 is formed opposite to the annular groove 51 . Inside this dY, there are two 0-IJ The ring seal 53 is positioned. The overall shape is a dumbbell. Two seals are created by the central Zorsu Guichisu 54; It is secured.

Explain the operation. The meter tester is connected and raised as shown in FIG. fluid The inlet is connected to the shell inlet boat 18 via piping 60. Return A pipe line 62 connects the central opening (fluid outlet) 20 to the instrument to be laterally strained. ing. A valve 64 is located between the pipe arrangement 60 and the return pipe arrangement W62. It is set on fire. In certain appropriate cases, the instrument tester will It is placed downstream rather than upstream. During normal operation, the pulp 64 is opened and The piston is in the starting position shown in FIG. Fluid resistance of open pulp resistance is less than the fluid resistance of the instrument tester, so the instrument tester itself The fluid penetrates the pulp, although it contains a fluid with a pressure of At the start of the inspection operation, the pulp 64 is as shown in Figure 3.1. closed as shown, thereby directing fluid in the direction of inlet port 18. deflect. The fluid flows through the ring located between the shell '14 and the test cylinder 22. It flows along the gap of the shape and further flows into the space chamber 34 through the hole 36. . In the starting position of the piston illustrated in Figures 2 and 3a, the piston The ton seal ring 53 is located within the bypass chamber 34. Therefore, the fluid is the piston Hole in the wall 52. through the inspection hole 32 and the fluid outlet hole, i.e. the central opening 2°. can flow freely. After a steady flow is obtained, the piston is moved to the Talo ( It is gently pushed out in the direction of the inspection hole 32. At this time, Histonshile 53 is bye. It exits the pass chamber 34 and engages the test hole as shown in Figure 3b. - Responsible, Once this engagement is achieved, the piston is tested in synchrony with the fluid flowing through the tester. Move along the hole.

During this inspection process, the output pulse from the instrument to be inspected is transmitted to the piston rod, which will be described later. Compare with the change in piston position measured by a tester installed at the free end of the .

At the end of the inspection process illustrated in FIG. 3C, the stone ring seal 53 Downstream 1[11 enters the bypass chamber 39. Therefore, the fluid momentarily flows through a relatively narrow piston. The bypass chamber can be entered through a hole 56 in the tongue wall. moved slightly more Finally, fluid can flow through the large hole 54. In this way, the The increase in fluid pressure on the upstream side of 0 ston is smoothly decreased, and the piston Ton floats. The quality of the piston/piston rod assembly The volume is small and does not differ greatly from the volume of the fluid being pushed out (discharged). It has an entirely hollow structure. This means that the piston has a small positive and therefore the piston This means that tons can be stopped quickly.

To complete the test operation, the pulp 64 is opened, thereby opening the inlet and outlet of the tester. Equalize the fluid pressures at. the piston until the seal 53 enters the inspection hole again. Gently push the button to the left (in Figure 1). Downstream side of the piston (in the inspection process) If the fluid pressure on both sides of the fluid piston is equal, then this difference in effective area results in the piston moving upstream/\\ (see Figure 3d). piston 's retraction! The movement continues, causing the piston to return to the initial position shown in FIG. The piston moves the fluid contained within the printer to the left side of the piston. Push out.

For this reason, the return movement of the piston is carried out automatically, thus reducing costs. No additional retrieval mechanism is provided for potential causes of pupil dilation and inoperability. stomach.

O Other preferred embodiments of the present invention will be described.

Block/no-lead technology is used to prevent leakage through the piston seal 53 has been done. As already suggested (French Painting Patent No. 2.481,449 etc.), Pi Monitors fluid pressure in the annular cage between stone seal rings for leak detection do. However, this method does not allow for changes in measuring relative to the absolute pressure measured. The problem is that it is extremely small and can be detected by conventional equipment. fluid The problem is that it is possible to improve the leakage limit. , to this point In this regard, and with particular reference to FIG. Fluid differential pressure transducer having a first input lower 2 connected to a radial hole 76 Contains 70. The transducer 70 extends through the collar 48. and opens into the groove 51 in the piston wall. The aforementioned shield is -sa (hole) 54 is a series of connecting holes 76 and the volume between the piston seals. It has radial holes 55 (shown in FIG. 4).

The second inlet of the pressure transducer is located upstream of the collar 48 through the tube 80. It communicates with a small hole 82 formed in the piston rod head. In this way, The pressure transducer connects the fluid in the inspection hole upstream of the piston and the two seals. The differential pressure between the rings and the fluid contained between them can be measured.

Ensure that the pressure of the subsequent fluid is measurably higher than the pressure in the test hole. Therefore, the pipe and the fifth chamber 34 are connected to the inspection hole itself, as shown in FIG. A slight chamfered portion 80 is provided ahead of IX. At the beginning of the inspection process, 1 Piston Li 1 The ring 53 enters the chamfer 80 and is compressed to its sealed shape. Sono Shiba After a while, the second piston ring in the relaxed state pre-engages with the chamfer and is in a predetermined position. A volume of fluid is reliably captured between two seal rings. the piston moves further Then, the second piston ring moves through the chamfer 2, thereby causing the second piston ring to move through the chamfer. The piston link is compressed in the direction of the mold halves. Initially: C was captured inside the beveled part. The fluid will occupy a radially pressure-lined volume. piston seal ring is elastic in nature, so each ring is itself slightly compressed. axially outwardly by the trapped capture fluid. These phenomena are The pressure sensed at the first inlet of the differential pressure transducer increases. You can recognize that. In this way, the fluid pressure between the seal rings is even small changes (in absolute value) can be measured and therefore undetectable. Diagnosis can be made by reducing the limits of fluid leakage.

5 and 6, the mechanism for gently pushing the piston into the inspection hole and the A device for detecting the position of the piston and the piston is illustrated. The support disk 90 , mounted on four equally spaced columns 92 extending parallel to the axis of the inspection cylinder. f1 has been eclipsed. The curved end of this ridge 92 is bolted to the end plate of the shell. It is fixed to an annular plate 94. The support disk 90 has a central hole 96. A piston rod is slidably supported within this central hole 96.

The support device is mounted so that two solid guide rods 98 are provided, one for each piston rod. It extends from disk 90. The free end of the guide rod 98 is connected to the connecting plate 10012. is connected to. Carriage 1 with two laterally extending wing-like members 104 02 is rigidly fixed to the free end of the piston rod. One hole in each wing 05 is formed, and a corresponding guide rod 98 extends through the hole 105. There is. Accordingly, the carriage slides along the guide rod. shilling-shaped A cover 107 is attached to the support disc 90 via an integral flange 109. It is. This cover 107 extends over the entire length of the guide rod and covers the cover plate 1. It ends at 11.

In addition to the guide rod 98, a lead screw 106 and an extruded shilling support with a square cross section are provided. A retaining rod 108 extends between the support disc 90 and the coupling plate 100. Li The head screw 106 is mounted so as to be freely rotatable. Carriage 102 A bushing 109 on the lateral wing of the lead screw is selectively connected to the lead screw. Can be screwed together. In the normal disengaged position, the bushing 109 It slides freely against the screw 106. In the engaged position, the carriage, piston The rod and piston shall be manually driven along the inspection hole by rotation of the lead screw. Can be done. This allows the meter tester to be calibrated.

At the intermediate position of the entire length, the extruded sill mounting rod 108j, four brackets ) 110 (two of which are shown in Figure 5). ing. A reciprocating extrusion sill-112 is attached to this bracket 110. There is. The extrusion piston rod 114 extends in the opposite direction from the extrusion sill-112. There is.

Each rod has an extruded finger 116 attached via an integral bearing sleeve 118. , which allows it to slide along the mounting rod 108. ing. On the underside of the mounting n108, each extrusion finger is attached to the carriage 10. It has a yoke-like shape that engages with 2.

When the test piston is in its starting position, the carriage 102 is on the left side. It engages with the extrusion finger 116. Push to move the hypostone rod to the right. Upon actuation of the ejection ring, the piston begins its test stroke. End of inspection process At this point, the carriage becomes engaged with the right extrusion finger. preferably is arranged so that the extruded silling applies a deceleration force to the piston via the carriage. place With the bypass valve in its open position, push the piston rod to the left. When the ejection ring is actuated, the piston moves into the inspection hole. As mentioned above The retraction stroke of the piston is caused by an imbalance due to fluid forces.

Below the guide rod 98, at the center 1c, and parallel to them, apply a linear φ straight tape 120. 100 and the reference point 12 provided on the supporting disk 90, respectively. 2 and 124.

This tape has a conventionally known configuration and includes magnetic marks. this The magnetic mark is mounted on the carriage 102 so as to overlap above the tape. The detected length is detected by transducer 126. length transducer signals from the piston to determine the position of the piston during its stroke. Axial position can also be measured. The axial position of the piston is measured continuously. This ability allows the test to be performed using pulses from the instrument being tested. Measuring the stroke 4 This is extremely important because the inspection process therefore occupies the entire revolution of the instrument. You can choose to This eliminates errors caused by periodic fluctuations in the instrument. It is possible to eliminate the occurrence of

A modification of the piston used in the above-described instrument tester is illustrated in FIG.

This piston is formed with a spaced outer Q-+) ring seal 21]2. It is configured to include an annular wall portion 200. In the center of the piston, the inner disc part material 204 is attached. The sealing engagement between the disc member and the wall portion is uniform. This is secured by a pair of inner O-v conductor seals 206.

The disk member 204 is integrally formed with the piston rod 208 and has a groove 210. ．． 212 is cut and formed within the piston rod 208. The disc member is Through the inspection hole and the alignment passage in the wall section, the outer Q-+) conductor seal 2160 It communicates with the volume between. These passageways pass through inner O-ring seals 206. 2ffi, the outer ○-ring seal 202 is removed by the method described above. Allows monitoring of blockages/bleeds caused by leakage through the do.

The disk section is secured to the piston by radially disposed shear pins 218. has been established. During normal use, the piston functions as a one-piece structure. do. However, when the piston becomes clogged in the inspection hole, the disk member 20. 1. The fluid force acting on the Separate the piston rod axially from the clogged cylinder and inspect it along with the fluid flow. Keep moving along the hole. In this state, the fluid flows through the tube. can pass freely around the disc member that is passed through and placed. can. The cross-sectional area of the release passage thus formed should ideally be should not be smaller than the cross-sectional area of the pipe arrangement leading to the test equipment.

In still other embodiments, the radially inner and outer portions of the piston may be connected. The divided rays f have a syringe shape (a truncated conical shape without t. The angle is such that the piston rod can move downstream relative to the rest of the piston. considered as something. Additionally, in other embodiments, a radially disposed shear The links are exchanged by toroidal (donut-shaped) shear links. . This shear ring acts both as a seal and as an overload protection device. Performs both actions.

Alternatively, the shear ring could be replaced with an expandable ring. the material The material and inflation pressures are chosen such that the ring ruptures at the maximum safe pressure of the fluid in the test hole. selected. The time it takes for the ring to burst at the threshold is or by using plunger pulp with a pointed point This can be reduced by

In still other embodiments of the instrument tester, the piston rod is not directly on the piston. A flexible coupling, for example a block made of elastic material, can be used to secure the determined. This procedure allows for slight movement of the piston rod relative to the piston. This can prevent piston clogging.

In still other embodiments, a pin 16 that can cooperate with the securing tape A linear measuring device consisting of a transducer mounted on the end of the rod (/l) The transducer itself is arranged coaxially with the inspection hole and attached to the piston. It is replaced with a fixed ruler that is compatible with the body. With this configuration, a hard piston A bellows type rod that extends from the upstream face of the piston to the corresponding end of the inspection hole. It can be replaced with a standard or pre-installed screw extension member. in this way Therefore, the effective area of the upstream surface of the piston is smaller than the effective area of the downstream surface, Thus, the automatic return movement of the piston described above is achieved. What is “effective area”? The area element perpendicular to the direction of piston movement.

FIG. 8 shows yet another embodiment. The aforementioned block/privi device If the excess pressure developed within is insufficient to sense, the plunger 300 , can be slidably mounted within a sleeve projecting from the carriage 102. . This plunger cooperates with the cam surface, e.g. Therefore, it is retracted in the initial position of the inspection process. sir A pressure is created within the chamber 302 of the cylinder block 3030. This surge , connected to the volume between the piston seals along the tube 304.

In other embodiments, the test hole is formed from the test cylinder and coaxial shell described above. It is constructed with a structure different from that of other devices. For example, the inspection hole may be rectangular or can also be a block with a circular non-cylindrical profile. The piston Benefits of an embodiment in which the piston can be separated into radially inner and outer circular parts when clogged. I explained the point. For other reasons, the piston is made up of two parts in the axial direction. I can do things. In other words, 7' maintenance of the piston seal ring. (Mamoru) becomes easier.

Technique 1 of the present invention: It is possible to make various corrections and changes without exceeding the new β range. .

) ーー几ん(t””15.ko”2nishiba2Zr,asFtcy,3 Fta, 6 ξ F1a, 7 22nd July, 1929 Mr. Manabu Shiga, Commissioner of the Patent Office Pc'r/':rr:K3/C1-3Cb6 correction person Relationship to the incident: Applicant 2ko4゛・,fu,1ノ+i,)'/-1-,-IL"Nomi Sento2□J,゛・do( shi)i′ノ(1pu　　”, ′(′〕〕zu)1u　　1　　・-・s　4- , - RimT key-1ii: Report

Claims (1)

[Claims] 1 An instrument tester for testing instruments connected to a fluid flow path, which has an inspection hole and ; a male swing sealingly engaged with the inspection hole and movable along the inspection hole; means for connecting the pilot hole in parallel with a portion of the flow path that does not include the meter; is operable to selectively allow a body to pass through the inspection hole or the parallel flow path section; bypass valve means; said screw 1 is synchronized with the flow along said inspection hole; The instrument is capable of being moved through the test stroke to discharge a known volume of fluid. In the tester, after the piston has finished moving the test pitch, the parallel flow When fluid begins to flow through the passage, it acts on the upstream and downstream surfaces of the piston. The piston returns toward the upstream side due to the fluid pressures becoming substantially equal. The effective area of the upstream surface of the piston is equal to the downstream surface of the piston. An instrument tester characterized in that the effective area is smaller than the effective area on the surface Q. 2. A piston from the upstream 111 of the piston to the axial boundary of the inspection hole. The meter test according to claim 1, characterized in that it is provided with a ton extension part. , test equipment. 3. The piston extension is movable with the piston. and includes a warinote piston rod attached to and extending outwardly from the inspection hole. The meter tester according to claim 1, wherein rt+m. 4 Length transducer means is provided at the free end of the piston rod, Length transducer means cooperates with a fixed scale to extend the length transducer in said test hole. The axial position of the piston is Claims characterized in that they can be determined in a simple manner Instrument tester listed. 5. The inspection hole is defined by a horizontal cylinder extending within a hollow cylindrical shell. The shell and the inspection cylinder are mutually connected only at both ends of the inspection hole in the axial direction. A meter tester according to claim 1, characterized in that the meter tester is connected to a meter. 6. The test cylinder has a fluid inlet means and a fluid outlet adjacent to each end thereof. means, the shell being remote from the fluid inlet means of the test cylinder. a fluid inlet means at one end of the instrument, thereby allowing fluid to pass through the instrument tester; into the annular gap between the shell and the test cylinder before fluid enters the test hole. The meter according to claim 5, characterized in that the meter is configured to flow along the instrument tester. 7. The inspection hole is provided with an end chamber having a diameter larger than the diameter of the inspection hole. defined by a test cylinder, said piston being axially disposed in said end chamber; the piston has an axial dimension that is longer than the axial dimension; When aligned with the end chamber, the piston is between the end chamber and the inspection hole. having a continuously open channel means through which fluid can flow A meter tester according to any one of claims 1 to 6, characterized in that: 8 The histostone is coaxial with the inspection hole and has at least one opening. The meter according to claim 7, characterized in that the meter comprises an annular wall portion having a Instrument test, test instrument. 9 The pistons are axially separable from each other in half directions 20 111If8II and a radially outer ♂ (1 part). The separation movement of the radially inner and outer portions is caused by the fluid applied to the piston. permanent deformation or failure when the applied force exceeds a predetermined threshold. characterized by being usually limited by at least one element that is Instrument type 1 experience R? r010 Syringe with an inspection hole and sealing with the inspection hole mounted within the cylinder so as to be able to engage with the target and move along the inspection hole. an instrument tester, the pistons being axially separated from each other; is formed with a possible radially inner f11 portion and a radially outer portion, and The separation movement of the radially inner and outer parts is caused by the piston ((due to the applied fluid) Permanently deforms or breaks when force exceeds a predetermined threshold. Usually 6! That there is a limit! Instrument tester on standby. 4 Raku (no change in F') 1