JP5096879B2 - Check valve check method and apparatus for check valve - Google Patents

Description

  The present invention relates to a check performance check method for a check valve cartridge that is detachably set to a required portion of a water pipe and an apparatus used therefor.

  Conventionally, as shown in Patent Document 1, for example, a check valve is set on the secondary side of piping equipment such as a water meter, and a meter box close to the main equipment for the purpose of preventing a water flow from flowing back to the main equipment. It was set in piping in a narrow space, etc., and it took a lot of labor and time to attach and detach for replacement repair. Therefore, as shown in Patent Document 2, measures are also taken to easily attach and detach the check valve for replacement and repair.

  In addition, check of the check valve's backflow prevention performance can also be considered as an integral part of the piping line. A shutoff plug and an inspection hole are provided on the primary side of the storage joint that houses the check check valve, and the shutoff plug is closed. As shown in FIG. 8, there is a closure plug body 101 on the primary side and a closure plug body 102 on the secondary side as shown in FIG. The water column pipe 111 was erected between the check valve 110 to be tested and the secondary shutoff plug body 102, and both shutoff plug bodies were closed and water pressure was applied through the water column pipe, and the inspection hole plug 112 was removed. A method for confirming the presence or absence of overflow from the inspection hole 113 that has sometimes occurred has been performed.

In the structure of the check valve shown in Patent Documents 1 and 2, when performing the above inspection method, the check valve must be removed from the pipe one by one or the pipe must be separated, and the shut-off plug on the primary side Only the method of providing the body and the inspection hole can perform incomplete inspection, and the method of setting the closing plugs on both sides is large and has a problem in terms of cost.
JP 2006-265990 A Japanese Utility Model Publication No. 05-75568

  However, the above-described inspection method in which a shut-off plug and an inspection hole are provided on the primary side of the storage joint in which the check valve is stored, or on the primary side and the secondary side, and the water column pipe is erected, This is possible if the stop valve setting environment does not restrict inspection work, but if it is set up in a piping line in a narrow space such as a meter box, work to remove the two inspection hole plugs and set up the water column pipe Is difficult and often causes the inspection hole plug to be dropped or lost at the bottom of the meter box. Furthermore, when the backflow prevention performance has declined, there is also a problem that it is difficult to confirm the water level drop of the secondary water column pipe.

  In addition, regarding the check on the check valve performance that must always be maintained, it is necessary to take troublesome work to remove the set check valve from the piping line. However, there is a problem of leaning on an easy method of expecting safety by regular replacement without performing inspection.

  The present invention is intended to address the above-described problems, and removes the check valve cartridge from the piping, seals the secondary side of the check valve, and opens the primary side to the inspection valve case. The check valve cartridge is fitted, compressed fluid is injected into the secondary side of the check valve, and the check valve secondary side is tested by a pressure gauge set between the injection fluid compression mechanism and the check valve case. The internal pressure was measured.

  In addition, a fitting structure with a locking groove on the inner circumference is formed on the bottom surface of the cap that covers the fitting space fitting opening that opens to the water pipe in response to difficult check valve installation and removal work in the meter box. In addition, a locking protrusion for locking the locking groove of the cover cap is provided on the upper surface of the check valve cartridge so that the check valve in the deep and narrow meter box also covers the cover. The check valve formed in the cartridge can be attached and detached simply by unraveling and picking up the cap.

  With this configuration, the check valve check performance, which has been performed only in an imperfect manner in an unstable work environment, can be checked by simply removing the check valve cartridge from the piping line. In a working environment, it can be carried out by an independent device equipped with an accurate pressure gauge.

  For the inspection device, the secondary side of the check valve to be fitted is sealed, and the check valve is fitted in the check valve case that opens the primary side, so that the primary side and 2 The state in which the water channel on the secondary side is closed is easily and completely revealed, and has an accurate measuring force as the water pressure is applied to the secondary side of the check valve by the injection fluid compression mechanism connected to the check valve case. A pressure gauge is used to measure and inspect the secondary side internal pressure by a connecting shaft provided with a fluid passage at the center shaft, and to measure the internal pressure of the check valve secondary side fitted in the check valve case on the connecting shaft. I made it.

  In addition, the inspection valve case is configured to be rotatable about the connecting shaft, and after injecting the compressed fluid into the secondary side of the check valve, the check valve case in which the check valve cartridge is fitted is rotated. Then, the primary side opening was directed upward, and the leakage of the secondary side compressed fluid was confirmed visually.

  Further, the injection fluid compression mechanism is configured to adjust the fluid pressure at the time of inspection in the fluid passage of the connecting shaft to a constant pressure by screwing the piston valve back and forth in the compression cylinder, and by moving the piston valve forward and backward in the compression cylinder. In addition to using the fluid pressure of the liquid in the fluid passage of the connecting shaft, it is possible to pressurize with air, and the compressed fluid is not liquid but easy to handle and does not require cleanup. I tried to reduce it.

  Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an inspection valve case, in which a check valve cartridge insertion opening 11 is opened at the top, and the check valve cartridge 3 is inserted with the secondary side up, and is sealed by a cap 4. Yes. The lower part is an opening 14 provided with a flange 13 for locking the primary side end so that the inserted check valve cartridge does not fall off.

  The side part of the inspection valve case 1 is connected to the injection fluid compression mechanism 6 via the pressure gauge 5 by a connecting shaft 2 having a fluid passage 21 at the shaft center, and is a non-return fitted in the inspection valve case 1. The internal pressure of the compressed fluid injected into the secondary space of the valve cartridge 3 is adjusted.

  That is, the injection fluid compression mechanism 6 is composed of a compression cylinder 61 and a piston 62, and the piston valve 63 at the tip of the piston 62 advances and retreats by screwing of the internal thread 6a of the internal diameter of the compression cylinder 61 and the external thread 6b of the external diameter of the piston 62. The volume of the pressure accumulation space from the secondary side of the valve case 1 to the pressure gauge 5 is adjusted, and the internal pressure when the check performance is normal is maintained constant.

  The pressure gauge 5 constitutes a pressure accumulating chamber 52 whose primary side communicates with the check valve case 1 via a rotary mechanism constituted by the rotary joint 51 and the connecting shaft 2 and whose secondary side communicates with the injection fluid compression mechanism 6. The cheese 53 is connected to the lower part, and the measurement indicating needle 54 is rotated corresponding to the internal pressure of the pressure accumulating chamber 52.

  The piston 62 of the injection fluid compression mechanism is pushed and inserted into the squeezing cylinder 61 by the operation of the handle 64, and the secondary space 35 of the check valve cartridge 3 in which the compressed fluid is inserted into the check valve case 1 and the pressure gauge The pressure accumulating chamber 52 is compressed and filled, and the volume of the pressure accumulating space is adjusted by advancing and retreating the outer peripheral screw 6b of the piston 62 and the inner peripheral screw 6a of the compression cylinder 61 so that the check performance is checked at a constant pressure. It has become.

FIG. 6 shows a pipe joint 7 configured so that the check valve cartridge 3 can be detachably fitted. A primary water channel 71 having a joint structure with a line pipe is fitted into the fitting space 72 from the lower side of the fitting space. The secondary water channel 74 is joined and communicated with the side portion of the fitting space.

  The upper portion of the fitting space 72 is locked to the inner peripheral wall of the inner diameter recessed portion of the bottom surface insertion portion 41 of the cap 4 that covers the fitting space fitting opening that opens to the water pipe, and the fitting inlet 75 of the check valve cartridge 3 opens. In addition to forming a fitting structure provided with a groove 42, a locking projection piece 31 that locks in the locking groove 42 of the cover cap 4 is provided on the upper surface portion of the check valve cartridge 3. If the stop protrusion 31 is fitted and connected, the cover cap 4 and the fitting inlet 75 are unscrewed, and the handle 4a of the cap 4 is picked up, the connected check valve unit 3 can be picked up as a unit. It is composed.

  The cartridge 3 is formed in a bowl shape by connecting the upper frame 3a and the lower frame 3b by a plurality of ribs 3c, 3c,..., And a conical valve element 36 or a spherical valve element 36a is inserted from the opening of the lower frame 3b. The valve seat 34 is covered. The conical valve body 36 is always in contact with the valve seat 34 due to its own weight, and is opened by the water flow from the primary side, but is pressed against the valve seat 37 when water pressure is applied from the secondary side to prevent backflow.

  A fitting ridge 3e that fits with a positioning recess 72a provided on the inner wall of the fitting space 72 in a single 3d disposed at a predetermined position in the plurality of ribs 3c, 3c... Connecting the upper frame 3a and the lower frame 3b. And positioning when the cartridge 3 is inserted into the fitting space 72 is performed.

  On the upper surface of the upper frame 3 a of the cartridge 3, a pair of locking projections 31, 31 are provided that are locked in locking grooves 42 provided on the inner wall of the inner diameter recessed portion 41 b of the insertion portion 41 of the cover cap 4. There is a locking claw 32 protruding outwardly from the top, and when the locking protrusions 31, 31 are inserted into the inner diameter recessed portion 41 b of the cap 4, the locking claw 32 is inserted into the locking groove 42. Locked.

  Since the locking claw 32 freely rotates within the locking groove 42, the cover cap 4 and the insertion cartridge 3 can be engaged and retracted between the male screw 41a and the female screw 14a in the above-mentioned engaged state. If the cap 4 is unraveled and picked up, the cartridge 3 can be taken out of the piping line as it is and fitted into the inspection valve case.

  In the case of the check valve cartridge 3 configured as described above, a female screw 11a screwed with the male screw 41a is engraved on the inner wall of the fitting inlet 11 of the check valve cartridge that opens to the top of the check valve case 1. Thus, the cover cap 4 of the upper frame 3a of the cartridge 3 can be used as the cover cap of the check valve case 1 without preparing a cap for the check valve case.

  As for the check performance check, first, the cartridge 3 is taken out from the line piping in which the check valve cartridge 3 is fitted like the pipe joint 7, and is fitted in the check valve case 1 and fitted with the cartridge 3. Then, the male screw 41a of the cover cap 4 taken out and the female screw 11a on the inner periphery of the fitting inlet 11 are screwed together to seal the secondary side of the inspection valve case.

When water is used as the compressed fluid for pressurizing the check valve secondary side, when the check valve case is turned and the primary side is directed upward, the valve body 36 is lowered by its own weight, and the check valve 1 Since the secondary side is in an open state, a predetermined amount of water is injected from there. When the valve body 36b is urged by the spring 33 as shown in FIG. 7, the valve body is pushed into the secondary side by the load and injected.

  When air is used as the compressed fluid, the handle 64 of the injection fluid compression mechanism is once pulled to increase the pressure accumulation volume, and then the check valve case is rotated to take in air, and the pressure accumulation space is re-rotated. The operating handle 64 is screwed to a predetermined position and the internal pressure in the pressure accumulating space is measured by the pressure gauge 5.

If there is no abnormality in the backflow prevention performance of the test check valve, the pressure displayed on the pressure gauge 5 is maintained at a predetermined value, but if there is an abnormality, the compressed fluid leaks and a pressure drop is displayed. become. The pressure gauge 5 Bourdon tube type as shown, from those digital, may be of a transparent water column tube as shown in FIG.

Further, the support shaft of the inspection valve case 1 is a rotation mechanism configured by rotatably inserting a connecting shaft 2 having a retaining ring 22 and an O-ring 23 fitted to the distal end portion thereof into a rotary joint 51. Therefore, by operating the handle 64, the compressed fluid is injected into the secondary space 35 of the check valve cartridge 3 fitted in the check valve case 1 and the pressure accumulating chamber 52 of the pressure gauge, and the measurement indicator needle 54 of the pressure gauge swings. After checking the above, if the valve case for inspection is turned and the primary side opening is directed upward, the state of the primary side of the valve body can be visually confirmed, so the leakage of the secondary side compressed fluid can also be visually confirmed. .

In this case, in the case of the conical type valve element 36 and the ball type valve element 36a, if there is a leak, the internal pressure on the secondary side cannot support the valve element, and the valve element maintains the contact state with the valve seat. Since the opening 14 is opened in a state in which the valve cannot be operated, the valve body drops to the cap side as shown in FIG. When the valve body is urged toward the valve seat by the spring, as shown in FIG. 7, the secondary side pressure is reduced by the spring urging force by pouring water into the primary opening facing upward. The air on the secondary side leaks to the primary side and bubbles are generated, so that poor performance can be confirmed.

  The present invention can be applied to various check valve units having different valve bodies as long as it is a lift type. For example, FIG. 6 shows that a biasing force by a spring 33 is applied to a conical valve body. When the valve body 36b is used, FIG. 7 shows the case where the ball valve 36c is used, both of which are known as check valve mechanisms, but basically different valves with different configurations according to the setting environment with the same configuration. A mechanism can be used.

  Since the present invention is configured as described above, the check valve reverse flow prevention performance, which has been performed only in an imperfect form in an unstable work environment so far, is checked from the piping line to the check valve cartridge. In a stable work environment by simple removal, it was possible to carry out by an independent device equipped with an accurate pressure gauge.

1 shows an embodiment of a check performance inspection device according to the present invention, and is a longitudinal cross-sectional side view of the entire check performance check device in which a main portion showing a state of fitting a check valve cartridge into a check valve case is a cutaway section. Similarly, a vertical cross-sectional side view of the entire check performance inspection device in which the check valve cartridge is fitted into the check valve case and the main part of the check valve is screwed in the compression direction by the operation handle, with the main part showing a cutaway cross section. Similarly, the entire check performance inspection device with the check valve case fitted with a check valve cartridge turned in the reverse direction by turning, and the main part showing the state that the valve body is supported on the valve seat surface by the internal pressure is a notched section Vertical section side view of Similarly, when the check valve case in which the check valve cartridge is fitted is reversely rotated, the check valve performance cannot be supported on the valve seat surface, and the main part indicating the fallen state is shown as a notch cross section. Overall longitudinal section side view Similarly, a longitudinal cross-sectional side view of the entire check performance inspection device with a cut-out cross section of the main part showing an embodiment using a transparent water column tube as a pressure gauge Similarly, a longitudinal cross-sectional side view of a pipe joint in which a check valve cartridge is detachably fitted and shows an example of a pipe joint in which the check valve cartridge is detachably fitted Similarly, a cartridge having a check valve body with a spring biased conical valve body is fitted into the check valve case, and the valve case is reversely rotated to visually check the check performance. Vertical section side view Similarly, a vertical cross-sectional side view of a check valve case fitted with a check valve cartridge showing a state in which a cartridge having a check valve body made of a spherical valve is fitted in the check valve case A vertical cross-sectional side view of a pipe section in which a check valve cartridge is fitted and set to show an implementation state of check performance check using a transparent water column pipe according to a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Check valve case 11 Test cartridge case inlet 11a of inspection valve case Female thread 12 of inner diameter of inlet port Secondary side sealing cap 13 of the check valve case according to another embodiment Cartridge retaining flange 14 of the check valve case Primary side opening 2 of valve case 2 Connection shaft 21 connecting inspection valve case Fluid path 22 of connection shaft axis Retaining ring 23 at the front end of connection shaft O-ring 3 Check valve cartridge 3a Upper frame 3b of cartridge Lower frame 3c Connecting rib 3d for upper and lower frames of cartridge Connecting rib 3e provided with positioning protrusion Positioning fitting protrusion 31 Locking protrusion 32 on top of check valve cartridge Locking claw 33 on top of locking protrusion Conical valve element biasing spring 34 Check valve cartridge seat 35 Check valve cartridge secondary space 36 Conical valve element 36a Covered valve body 36b Energizing spring conical valve body 4 Cover cap 41 Cover cap insertion part 41a Cover cap insertion part male screw 41b Cover cap insertion part inner diameter recessed part 42 Cap bottom face insertion part inner diameter recessed part inner circumference engagement Stop groove 44 Knob handle 5 on the top of the cover cap Pressure gauge 51 Rotary joint 52 Pressure measurement accumulating chamber 53 Cheese 54 Measuring needle 6 Injection fluid compression mechanism 6a Female cylinder 6b of compression cylinder inner diameter Male screw 61 of piston outer diameter 61 Compression cylinder 62 Piston 63 Piston valve 64 Piston advance / retreat operation handle 7 Check valve fitting piping joint 71 Primary water channel 72 of piping joint Check valve fitting space 72a of piping joint Check valve fitting positioning recess 73 Non-return of primary water channel Communication opening 74 to valve fitting space Water passage 75 on the secondary side of the pipe joint Check valve cartridge inlet 1 of the pipe joint DESCRIPTION OF SYMBOLS 1 Check valve primary side cutoff plug body 102 by conventional example Check valve secondary side cutoff plug body 110 by conventional example Check valve 111 by conventional example Performance check by conventional example Water column pipe 112 Check performance by conventional example Inspection hole plug 113 Check performance check hole according to conventional example

Claims (6)

Remove the cartridge of the check valve from the piping , open the primary side of the check valve, and place it on the turnable check valve case. The cover cap seals the check valve case. The secondary side of the check valve cartridge to be tested is detachably engaged and fitted, and a pressurized fluid is injected into the secondary side of the check valve, and the injection fluid compression mechanism and the check valve case Checking performance of the check valve, characterized by checking the check valve's check performance by measuring the internal pressure on the secondary side of the check valve with a pressure gauge set in between   After injecting the compressed fluid into the secondary side of the check valve, the check valve case in which the check valve cartridge is fitted is rotated so that the primary side opening is directed upward and the secondary side compressed fluid is leaked. The check performance check method for a check valve according to claim 1, wherein the check performance is also confirmed visually. Check the performance service method of the check valve according to claim 1 or claim 2, wherein as adapted to use air with a test check valve secondary pressure to compress fluid that has Osamuhama the inspection valve casing The secondary side of the non-returning check valve is sealed, and the inspection valve case that opens the primary side and the injection fluid compression mechanism are connected to each other by a connecting shaft having a fluid passage at the center, and the connecting shaft is inspected. A non-return valve characterized in that a pressure gauge for measuring the internal pressure of the check valve secondary side fitted in the valve case is set , and the inspection valve case is rotatable about the connecting shaft as a support shaft. Valve check performance inspection device   The check valve check performance check device according to claim 4, wherein the injection fluid compression mechanism is configured to adjust the fluid pressure in the fluid passage of the connecting shaft by screwing the piston valve into and out of the compression cylinder.   A cap mechanism that seals the secondary side of the valve case for inspection is connected to the inner end of the non-return valve fitting portion cover cap of the pipe by fitting and locking the secondary side end of the check valve cartridge. The said check valve WHEREIN: The cap mechanism which comprised the female screw screwed with the fitting part cover male screw of the cap outer periphery in the secondary side inner periphery of the valve case for inspection, and was screwed together. Check valve check performance check device

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