JP5063250B2 - Check valve unit with performance check mechanism - Google Patents

Description

  The present invention can be set as a check valve in a required part of the piping, and the check flow prevention performance of the built-in check valve can be easily checked at any time, so that it can be repaired and replaced very easily if a failure or a functional deterioration is found. Further, the present invention relates to a check valve unit provided with a strainer mechanism for filtering foreign matter.

  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 in the piping close to the main equipment for the purpose of preventing the water flow from flowing back to the main equipment. Since it is set, it takes a lot of time and labor to attach and detach. Therefore, as shown in Patent Document 2, measures are also taken to easily attach and detach the check valve for replacement and repair.

  However, although the check of the check valve's backflow prevention performance is an extremely important matter, the check method is to provide a shut-off plug and check plug on the primary side of the check check valve, and close the shut-off plug. Due to the presence or absence of overflow in the check plug due to the residual pressure on the secondary side when the check plug is opened, a shut-off plug body is also set on the secondary side, and between the check valve and the secondary shut-off plug body An old method has been used in which a water column pipe is erected and both the shut-off plug bodies are closed and water pressure is applied through the water column pipe to check whether there is overflow from the check plug that occurs when the check plug is removed.

  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 The method of only providing the body and the check plug can perform only incomplete inspection, and the method of setting the cut-off plug bodies on both sides is large and has a problem in terms of cost.

In addition, as a strainer for removing dust from the water passage from the primary side to the secondary side, a bag shape as shown in Patent Document 3 or a cylindrical shape as shown in Patent Document 4 is used. However, both have been fixedly set in the valve box as independent members.
JP 2006-265990 A Japanese Utility Model Publication No. 05-75568 Japanese Patent No. 3327843 Japanese Patent Laid-Open No. 11-148571

  As described above, the conventional check valve must always be maintained, and must be maintained by an incomplete method or an extremely large method for checking the check valve performance. However, there is a problem of leaning on the easy method of expecting safety by regular replacement.

  In addition, for the filtration of water flow, which is important for maintaining the backflow prevention performance, the check valve and strainer are fixedly incorporated in the valve box as independent members, so the check valve must be replaced and the strainer cleaned. Since the valve box sometimes has to be disassembled, much time and labor are required for disassembling and reassembling the valve box constituting the stopper body.

  The strainer that removes dust from the water passage from the primary side to the secondary side adopts a method that fits in the water passage, and the dust that is filtered by the screen facing the water flow is in the center of the screen. Therefore, frequent cleaning is required because the trapped garbage prevents water from passing through.

Furthermore, since the check valve set as a member in the pipe required part is joined in a fixed pipe configuration, there is a problem that maintenance work etc. must be done from various directions in a narrow space. This places an extra burden on employees.

  SUMMARY OF THE INVENTION The present invention is intended to address the above-described problems. In a valve box having a pipe joint structure, a storage chamber for a check valve cartridge, a through-hole penetrating to the left and right and below, a check valve on the upper surface. Stores a sphere with an open check valve insertion port for inserting the cartridge into the storage chamber, covers it with a cap with a backflow prevention performance check mechanism on the top surface, and caps the primary side of the check valve by turning the sphere Water pressure was applied to the secondary side in the direction so that the backflow prevention performance could be checked by the inspection mechanism on the upper surface of the cap.

  With this configuration, the water passage formed by the primary side that is the check valve insertion opening and the lower through hole is rotated so that the primary side faces in the cap direction and the lower through hole is blocked by the valve box bottom. Since the through hole that penetrates to the left and right constitutes the water passage, water supply to the consumer is performed by the through hole that penetrates to the left and right of the sphere, and reverse pressure is applied to the check valve cartridge without causing the worst situation such as water breakage, The check plug can be removed to check the backflow prevention performance only by rotating the sphere.

  In addition, by setting a strainer mechanism on the primary side of the check valve cartridge, foreign matter can be prevented from entering the check valve mechanism, and the malfunction of the check valve can be actively prevented. Furthermore, if the spherical check valve insertion opening is faced up and the cap at the top of the valve box body is removed and the sphere insertion opening is opened, the check valve cartridge and strainer mechanism can be removed without disassembling the valve box body. So that it can be easily cleaned and replaced.

  The strainer mechanism is set by setting a washer at the check valve insertion opening of the sphere into which the check valve cartridge has been inserted, and inserting a stop ring into the locking groove drilled in the inner periphery of the insertion opening by placing the screen and strainer presser. Thus, the check valve mechanism including the strainer is detachably configured by attaching and detaching the stop ring.

  Further, the strainer screen mounted on the check valve unit is formed by bulging the central portion in the shape of a straw hat on the primary side and the outer peripheral edge rising in the shape of a fence, and the check valve cartridge as described above. Each member is separated and selectively detachable by being clamped to the primary side of the check valve body by a washer and a strainer press set to be fixed and locked by a stop ring.

  With this configuration, the strainer screen that has been exchanged and discarded together with the frame can be replaced as a single screen, making it possible to employ a variety of screens in terms of materials and mesh, and a significant increase in material. Added savings.

  Further, by causing the central portion of the strainer screen to bulge to the primary side, the dust to be filtered collides with the central bulge portion of the screen and is swept away by the peripheral area of the bulge by water pressure and concentrated on the central portion of the screen. In addition, the outer peripheral edge formed by standing up like a fence is prevented from spilling from the peripheral end, so that the strainer can be easily cleaned.

Furthermore, the pipe joints on both sides of the valve box are configured as sleeves with a rotation mechanism so that the check valve unit main body can be freely rotated with respect to the fixed joint pipe for maintenance in a confined space. When performing such operations, the check valve unit main body is rotated to an angle at which it can be easily operated to reduce the work load.

  Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a valve box body of a check valve unit, which is a rotating operation mechanism 11 for a sphere 2 housed on the front side, a sleeve 12a for joining a primary side pipe to the side primary side, and a secondary side on the secondary side. A sleeve 12b for joining pipes is set, and an opening 13 for inserting the sphere 2 is opened on the upper surface.

  The sleeves 12 a and 12 b are provided with protrusions 15 that are fitted into fitting grooves 14 provided on the inner periphery of the valve box side insertion ports 14 a and b at the mounting base with the valve box body 1, Even if the check valve unit is set in the fixed pipe so that it can be pivotally attached to the valve box body 1 by the O-ring 16 while maintaining watertightness by the fitting of the check valve, Since the unit can be rotated 360 degrees, the check valve can be directed in the direction in which it can be easily operated during maintenance work. Of course, a fixed pipe joint may be provided without providing the sleeve rotation mechanism.

  The spherical body 2 stores the storage chamber 21 of the check valve cartridge 3 in the core, the through holes 21a and 21b that pass through the water supply holes that constitute the water supply channel at the time of inspection from the left and right, and the check valve cartridge on the upper surface. A check valve insertion port 22 to be inserted into the chamber 21, a through hole 21 c that opens to the secondary side of the check valve are opened below, and the tip 11 a of the rotation operation mechanism 11 is inserted into the fitting recess 23 provided on one side. It fits and is accommodated in the center part of the valve box main body 1 via accommodating seats 2a and 2b.

  The check valve cartridge 3 energizes the valve body 3a by a spring in a frame body constituted by ribs, and is inserted into the storage chamber 21 of the sphere 2 with the upper surface primary side facing the opening side from the check valve insertion port 22. The O-ring 3b fitted on the outer periphery of the front end of the frame is kept watertight.

  After the check valve cartridge 3 is fitted, the retaining ring 4c is fitted into the locking groove 22a formed in the inner periphery of the insertion opening by placing the screen 4 through the washer 4a at the top and the strainer presser 4b at the top. By being fixedly locked, a check valve mechanism having a strainer mechanism is formed in the sphere.

  The screen 4 of the strainer mechanism may be a flat wire mesh or the like, but by using a wire mesh with a central portion bulging in the shape of a straw hat or a molded synthetic resin, the dust to be filtered is removed from the center of the screen. Colliding with the bulging part and being swept away by the bulging peripheral part due to water pressure, it is prevented from being concentrated and captured at the central part of the screen, and the number of cleanings of the strainer can be reduced.

  The screen 4 with the central portion bulging toward the primary side like a straw hat is further provided with a fence frame 41 having a fence-like outer peripheral edge rising like a fence so that the filtered dust does not spill from the screen. In this way, the screen can be cleaned quickly and easily.

  As described above, the sphere 2 storing the check valve mechanism having the strainer mechanism is accommodated in the central portion of the valve box body 1, and the opening 13 is covered with the cap 5 having the backflow prevention performance check mechanism set on the upper surface. .

  As the backflow prevention performance check mechanism, various mechanisms such as a simple one in which the pressure release hole is plugged with an insertion plug can be used. As an example, a known ball plug that opens and closes the pressure release hole with a rotating ball is used. By using 51, a water pressure tester or the like can be joined to the ball stopper joining mechanism 52 to perform a water pressure test of the entire pipe including the valve box body 1.

  The check valve unit configured as described above is set as a required pipe section by the sleeves 12a and 12b, and the spherical check valve insertion port 22 is moved to the primary side as shown in FIG. 1 by the rotation of the handle 11b. By directing, a normal water passage is formed which allows water to flow to the secondary side via the strainer and the check valve.

  When checking the backflow prevention performance, if the ball 2 is rotated by the handle 11b and the check valve insertion port 22 is directed to the cover cap 5 on the upper surface as shown in FIG. 3, the water flow is the check valve body 3a. Since the water is passed through the secondary side pipe while applying water pressure to the secondary side, the water flow is also filled from the opening 13 into the pressure relief hole 5a of the cap 5 if the backflow prevention performance of the check valve is reduced. When the ball stopper 51 is opened, the water overflows and the performance deterioration can be detected immediately.

  Since the present invention is configured as described above, it is possible to check the backflow prevention performance by applying back pressure to the wearing check valve only by operating the handle 11b without stopping the water supply, and the cap 5 is opened. Since the mechanism of the check valve unit can be disassembled simply by releasing the fitting of the retaining ring 4c that is latched and fitted into the insertion opening 22 of the ball 2, the replacement and maintenance of the strainer and the check valve unit can be easily performed. It was something that could be done.

The side view which shows the non-return valve unit with a backflow prevention performance check mechanism by the Example of this invention, and made the structure principal part in the water flow state the longitudinal cross-section. Similarly, cross-sectional plan view of a check valve unit with a check mechanism with backflow prevention performance with the cross section of the main part of the structure in a water flow state Similarly, a side view with the longitudinal section of the main part of the structure when the sphere is turned to check the backflow prevention performance. Similarly, an exploded explanatory view showing the joint relationship between the check valve cartridge, the strainer mechanism, and the stop ring mounted in the spherical storage chamber accommodated in the valve box.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve box main body 11 of non-return valve unit Sphere rotation operation mechanism 11a of valve box main body Sphere fitting part 11b at the tip of sphere rotation operation mechanism Sphere rotation operation handle 12a Primary side piping joint sleeve 12b of valve box main body Secondary piping joint sleeve 13 of the box body Sphere insertion opening 14 of the valve box body Fitting groove 14a of the piping joint sleeve insertion port inner periphery of the valve box body Primary piping joint sleeve insertion port 14b of the valve box body Valve box body Secondary pipe joint sleeve insertion port 15 Fitting protrusion 16 on the outer periphery of the pipe joint sleeve O-ring 2 of the pipe joint sleeve 2 Sphere 2a accommodated in the central portion of the valve box Sphere accommodating seat 2b Sphere accommodating seat 21 Sphere Non-return valve cartridge storage chamber 21a Primary side through hole 21b on the side of the sphere Secondary side through hole 21c on the side of the sphere Secondary side through hole 22 below the sphere Spherical check valve insertion port 22a Inner circumference of the insertion opening Rotating mechanism engaging recess 3 on the side of the sphere 3 Check valve cartridge 3a Check valve cartridge 3a Check valve cartridge fitting O-ring 4 Strainer screen 4a Strainer setting washer 4b Strainer presser 4c Stop ring 41 Strainer screen peripheral edge rising frame 5 Cap 5a with backflow prevention performance check mechanism Ball cap 51 for cover cap prevention Backflow prevention performance check ball stopper 52 Ball stopper equipment joint mechanism

Claims (4)

  A check valve cartridge storage chamber and through-holes that pass through to the left and right and below in a valve box with a spherical rotation operation mechanism on the front side, piping joints on both sides, and a check valve cartridge insertion port on the upper surface The sphere with the check valve insertion opening inserted into the storage chamber is stored on the top surface, and the check valve cartridge is stored in the sphere with the check valve body facing the insertion port. The check valve unit with a performance check mechanism is characterized in that the check valve cartridge insertion port of the valve box is covered with a cap having a check mechanism for checking the backflow prevention.   2. The valve joint body on both sides of the valve box is configured as a sleeve having a rotation mechanism so that the check valve unit main body can freely rotate with respect to the fixed joint pipe. Check valve unit with performance check mechanism   3. A check valve unit with a performance check mechanism according to claim 1, wherein a strainer mechanism is set on the primary side of the check valve cartridge.   4. A check valve unit with a performance check mechanism according to claim 3, wherein the screen set in the strainer mechanism is bulged at the center like a straw hat and the outer peripheral edge is raised like a fence.

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