KR101003768B1 - The counterflow preventing device with dual check valve - Google Patents

Abstract

The present invention relates to a backflow prevention device is installed on the water supply line from the water inlet pipe to the water supply pipe, and more particularly, is installed on one side of the water meter meter to prevent backflow of water when the water is cut off by the construction of the main water pipe. At the same time, the present invention relates to a backflow prevention device provided with a straight pipe to enable accurate measurement of a meter of a water meter.

The present invention provides a backflow prevention device having a dual check valve for connecting a water meter and a water supply pipe, the straight pipe being coupled to the rear end of the water meter meter; An inlet formed of an inlet port coupled to the straight pipe and formed with a step for fixing the valve and a predetermined length of pipe for seating the valve; a locking step for preventing a valve flow formed at the rear end of the inlet part; A pipe having a predetermined length in which a valve is seated at the rear end of the pipe and a connection part having an opening / closing part for fixing and detaching the valve at the rear end of the pipe, and a pipe that is curved at one side of the pipe of the connection and discharges the fluid passing through the water inlet. And a connection pipe configured to be connected to the pipe line and configured to include a water outlet for mounting the water supply pipe. A first check valve having a front surface fixed to a step of the inlet and seated on an inner conduit of the inlet; And a second check valve having a front surface fixed to the locking jaw and seated on an inner conduit of the connection part.

The backflow prevention device of the present invention comprises a connecting pipe having a connection part such that the inside of the pipe is curved, and the check valve is built in the connection part is configured to open and close the inside of the pipe of the connection pipe, the two check valve is built Even if a straight pipe for accurate measurement of water meter and meter is reduced by minimizing the length of connector, it can be installed in the existing water supply pipe without any additional piping.

Connecting pipe, water meter meter, straight pipe, check valve

Description

Backflow prevention device with dual check valves {The counterflow preventing device with dual check valve}

The present invention relates to a backflow prevention device is installed on the water supply line from the water inlet pipe to the water supply pipe, and more particularly, is installed on one side of the water meter meter to prevent the backflow of water and at the same time accurate measurement of the meter of the water meter It relates to a backflow prevention device is installed so that the straight pipe.

The present invention relates to a backflow prevention device combined with a straight pipe, and more particularly, a dual check valve is provided to prevent water from flowing back due to a pressure difference such as water hammer, such as when one side of the water pipe is suddenly submerged. Meter The present invention relates to a backflow prevention device incorporating a straight pipe to enable accurate measurement of a meter.

In general, the water pipe is supplied to the water meter, measured through a meter, and supplied to the home or other business through the water supply pipe.In this case, the water pipe flows in one direction due to the pressure of the tap water, but it flows in a constant manner such as when the valve of the faucet is suddenly submerged. This can lead to water backflow due to water hammering, which is caused by a sudden shutdown of the water supply.

In this way, if the check valve for preventing the back flow of water is not installed in the pipe supplied through the water pipe, the tap water flows back through the pipe.

In order to prevent this, as shown in Figure 1, registered utility model publication (Registration No. 20-0387266, design name: backflow prevention connection valve) installed in the interior of the water meter protection container having a narrow size of the inner area The present invention provides a backflow preventing connection valve having multiple check valves of the same structure in series.

Figure 2a and 2b is a cross-sectional view showing a non-return valve connection valve according to the prior art and the reverse flow prevention connection valve (6) consisting of a connecting pipe (4) with a built-in check valve (3) and a connecting valve body (5) The state coupled to the meter meter 1 and the water supply line 2 is shown, respectively.

However, when the connection pipe 4 with the check valve 3 built in this way is directly mounted on the water meter meter 1, the measurement of the water meter meter 1 may be inaccurate.

In other words, Figure 3 shows the installation method of the meter of the water meter, as shown in the inlet side of the water meter 5 times the diameter of the meter at the center of the elbow, the outlet side of the diameter of the meter 3 A straight pipe (7) of more than twice the length and other valve arrangements must be installed after that to ensure accurate measurement of the water meter meter (1). That is, when passing through the connection pipe, such as elbow, the fluid is changed to turbulence, when the meter is mounted directly on the connection pipe, there is a problem that can not accurately measure the flow rate due to the generation of turbulence, diameter from the connector such as elbow It requires about five times the intuition distance. In addition, in order to prevent the fluid passing through the meter to suddenly change to turbulent state at the outlet side, it requires a straight distance of about three times the diameter. This is illustrated in 5.3.4 of KS B 50049-1. This standard states that if the precision of the water meter is subject to disturbances due to the influence of incoming piping (eg disturbance due to the presence of elbows, valves or pumps), the water meter may be fitted with a straight length of sufficient length specified by the manufacturer. It is prescribed. The length of the straight pipe is generally about 5 times the pipe diameter from the front elbow or the valve rear end, and about 3 times the pipe diameter from the rear end of the meter.

However, in the case of connecting the reverse pipe connection valve as shown in FIGS. 2A and 2B with the straight pipe 7 as it is and connecting with the meter 1, the following problems may occur.

Since the water supply pipe 2 to which tap water is supplied is conventionally installed in a fixed position in a building, as shown in FIG. 4, the connection valve body in a state of being moved by additionally coupling a straight pipe 7 ( There is a problem that can not be connected to the water supply pipe (2) as it is. In addition, when the check valve (3) is continuously embedded in the connecting pipe (4) as in the prior art, the length of the connecting pipe (4) has to be inevitably expanded along the length of the continuous check valve (3). have.

That is, to connect the water supply pipe 2 and the connecting valve main body 5 of the check valve for preventing the flow of the backflow, only a few more connecting pipes are required. Therefore, the trouble of work and an increase in installation cost occur. Will have

In addition, when mounting, checking, repairing, or replacing the check valve 3 built in the backflow preventing connecting valve 6, in particular, the check valve 3 built in the inlet side of the connecting valve body 5 There is a problem in that the check is possible only by disassembling the entire backflow preventing connection valve (6), which is cumbersome in operation and thus a time loss.

In order to solve the above problems, the present invention is to form a connection pipe by integrating the connection pipe body and the conventional connection valve body, by reducing the length of the straight line from the water meter meter to the water supply pipe, even if equipped with a straight pipe, the existing equipment It is an object of the present invention to provide a backflow prevention device that can be installed without additional equipment in the water supply pipe.

In addition, even if two check valves are built in the connecting pipe, it is an object of the present invention to provide a backflow prevention device configured to have two check valves embedded in the connecting pipe with a minimum length of the connecting pipe.

In addition, an object of the present invention is to provide a backflow prevention device designed in a structure capable of separately mounting, checking, maintaining, and repairing two check valves built in the backflow preventing device.

In order to achieve the above object, the present invention provides a backflow prevention device having a dual check valve connecting the water meter and the water supply pipe, the straight pipe coupled to the rear end of the water meter meter; An inlet formed of a water inlet formed with a pipe having a predetermined length for seating of the valve, and a jaw for preventing the flow of the valve formed at the rear end of the inlet; A pipe having a predetermined length in which a valve is seated at the rear end of the pipe and a connection part having an opening / closing part for fixing and detaching the valve at the rear end of the pipe, and a pipe that is curved at one side of the pipe of the connection and discharges the fluid passing through the water inlet. And a connection pipe configured to be connected to the pipe line and configured to include a water outlet for mounting the water supply pipe. A first check valve having a front surface fixed to a step of the inlet and seated on an inner conduit of the inlet; And a second check valve having a front surface fixed to the locking jaw and seated on an inner conduit of the connecting portion.

In addition, a rim formed on the front surface of the first check valve is seated on the stepped portion of the inlet connected to the straight pipe, and the rim of the first check valve is fixed as the straight pipe and the inlet are coupled to the first check valve. Can be fixed.

In addition, the opening and closing portion formed in the connecting portion is composed of the opening and closing openings formed in the rear end of the connection pipe, and the opening and closing cap for opening and closing the opening and closing, the second check valve is fixed to the locking jaw formed on the rear end pipe of the inlet portion And the back may be fixed by the opening and closing cap.

In addition, the second check valve seated on the connecting portion is mounted inside the valve housing and the valve housing and moved between the valve body and the valve body for opening and closing the flow path and the elastic member is provided between the end of the valve housing and the valve body to give elastic force to the valve body Consists of, the opening and closing cap may be formed with a groove for the movement of the second check valve body.

In addition, the outlet portion of the connection pipe may be configured to be curved in one side of the pipe passage of the connection portion so that the flow path is changed to the side when opening the second check valve.

In addition, the inlet portion and the connecting portion of the connector can be configured to be located on the same center line. In addition, the connecting portion of the connector can be configured to be formed at a predetermined angle upward from the center line of the inlet portion.

In addition, the inner passage of the connecting portion is expanded, and the enlarged check valve may be configured to be seated in the expanded inner passage.

In addition, the length of the straight pipe may be configured to be three to four times the diameter of the water meter meter connected to the straight pipe.

Through the backflow prevention device according to the present invention can obtain the following effects.

First, the present invention is to form a connection pipe integrating the conventional check valve and the connection pipe to install a straight pipe to reduce the straight line length from the water meter meter to the water supply pipe, additional pipe line additionally equipped with a separate pipe It can be installed in the existing water supply pipe without having to have a cost advantage in working time.

Secondly, the backflow prevention device of the present invention comprises a connecting pipe having a connection part in the inner conduit, and a check valve is built in the connecting part to configure the opening and closing of the inner conduit of the connecting pipe, thereby providing two check valves. By reducing the length of the built-in connection pipe to a minimum, even if equipped with a straight pipe can be configured to be installed in the existing water supply pipe without a separate additional equipment line.

Third, the connecting pipe is configured to have two check valves, while one check valve is mounted at the inlet side of the connecting pipe, and the other check valve is formed to open and close the opening to the connecting part of the connecting pipe separately. It is possible to install the check valve, install, check, and maintain the check valve separately so that the piping work can be made easier.

Fourth, the backflow prevention device has the advantage that by measuring the length of the straight pipe to more than three times the diameter of the water meter meter, it is possible to accurately measure the amount of tap water with the backflow prevention.

Hereinafter, a backflow prevention device equipped with a straight pipe according to the present invention will be described in detail with reference to the accompanying drawings.

5 is a perspective view and a cross-sectional view of a backflow prevention apparatus equipped with a straight pipe according to a first embodiment according to the present invention, and FIG. 6 is an exploded view of a backflow prevention apparatus equipped with a straight pipe according to a first embodiment according to the present invention. 7A and 7B are exploded perspective views showing a check valve used in accordance with a first embodiment of the present invention, and FIG. 8 shows a state diagram of a backflow preventing device according to a first embodiment in accordance with the present invention.

Referring to the bar, the reverse flow prevention apparatus according to the present invention is connected to the water meter meter 10 and the water supply pipe 20 is coupled, and consists of a straight pipe 100 and the connection pipe 200.

One side of the straight pipe 100 is coupled to the water meter meter 10, preferably, the straight pipe 100 is equipped with any valve therein for accuracy of measurement of the amount of water of the water meter meter 10. It is not, it consists of a short pipe three times or more in length, in detail three to four times the length of the diameter (diameter) of the water meter meter 10 connected to the straight pipe.

The straight pipe 100 is screwed through the fastening screw 30 and the meter 10 of the water meter, and also between the straight pipe 100 and the meter 10 of the water meter by placing a snap ring 40 Strengthen the bond.

In addition, one side of the connection pipe 200 is coupled to the straight pipe 100, the connection pipe 200, in addition to the inlet 210 and the outlet 230, the inlet 210 and the outlet 230 The connection portion 220 for changing the conduit is further formed.

The inlet 210 is composed of an inlet 211 and the conduit 213, the stepped 212 is formed in the inlet so that the first check valve 240 can be fixed. The stepped 212 is fixed to the front surface of the first check valve and the valve housing 242 is seated in the conduit 213. The connection part 220 has a locking step 221 is formed in the front end of the pipeline 222, the locking step serves to fix the front surface of the second check valve 250 does not flow. The valve housing 252 of the second check valve 250 is seated in the conduit 222 of the connecting portion 220, and is curved in one side of the conduit 222 in which the second check valve is seated so that the flow path may be changed. Pipe line 231 is formed so that the end of the pipe line 231 is formed to be connected to the water supply pipe is formed with a water outlet (232). Therefore, an opening and closing part for mounting the second check valve 250 is required, and for this purpose, an opening and closing hole 225 penetrating through the conduit 222 is required on the outer circumferential surface of the connection part 220. In addition, the opening and closing cap 227 for opening and closing the opening and closing port 225 is also required. Accordingly, the opening and closing cap 227 may be opened to mount the second check valve 250, and the mounting and maintenance of the second check valve 250 may be facilitated through the opening and closing cap 227.

Here, the connecting portion 220 is connected to the inlet 210, the connecting portion 220 is connected to the outlet 230 serves as an intermediate to make a curved pipe. As the connection part 220 and the water extraction part 230 are connected, the connection pipe 200 may form an elbow shape or another shape of a curved pipe.

As such, the check valves 240 and 250 respectively installed through the inlet unit 210 and the connection unit 220 can be individually installed, installed, inspected, and maintained, thereby reducing the inconvenience of work.

In addition, the second check valve 250 is configured to open and close the flow path 230 is formed so that the flow path is immediately changed on one side inside the pipe 222 of the connection portion 220 of the connection pipe 200 There is an effect that two check valves 240 and 250 may be embedded in the connection pipe 200 without extending the length of the connection pipe 200. That is, since the outlet portion 230 is formed to be curved so that the flow path is changed on the side of the valve housing 252 where the valve body 254 in which the second check valve 250 is opened and closed moves, the curved pipe is not formed at the rear end of the check valve. As a result, the length of the connecting tube is shorter than that of the elbow or the like. As shown in FIG. 5, the distance L ₁ from the front end of the first check valve 240 to the center line of the water outlet is significantly shorter than that of the conventional elbow connector.

In addition, the connection pipe 200 is further configured to open and close the cap 227 for opening and closing the connecting portion 220, one end surface of the opening and closing cap 227 is built in the conduit 222 of the connecting portion 220 By forming a support end 227b that can fix the rear end of the check valve 250, it serves to support and fix the second check valve 250. That is, the front end of the second check valve 250 is fixed by the locking step 221, the rear end is fixed by the support end 227b of the opening and closing cap 227 to prevent the flow. In addition, the opening / closing cap 227 may further include an insertion groove 227a to move the valve stem 254b of the second check valve 250. In addition, an O-ring 228 may be mounted on the outer circumferential surface of the opening / closing cap 227 mounted on the screw 226 of the opening / closing 225 to prevent leakage and maintain airtightness. Detailed operation principle thereof will be described later.

As shown in Figure 7a, 7b, the check valve may be of two types. However, such a check valve is a means that can be any number of changes in the position of a person having ordinary skill in the art will be obvious that the scope of the present invention is not limited to the configuration of the check valve.

First, in the case of the first check valve 240 shown in Figure 7a, it is mounted on the stepped portion 212 formed in the inlet 211 of the connection pipe is seated in the pipeline of the connection pipe, at the same time straight pipe 100 It is configured to be fixed and supported by coupling the straight pipe 100 and the inlet 211 in contact with the.

The first check valve 240 includes a valve housing 242, a valve body 244, an elastic member 246, a housing cover 248, and a binding cover 249. The valve body 244 is composed of a valve disk 244a and a valve stem 244b.

The valve housing 242 has a guide hole 242a formed on one side and a fastening portion 242b formed on the other side, and a plurality of guide ribs 242c are formed on the outer circumferential surface so that water flows between the guide ribs 242c. It is composed.

The valve body 244 is provided with a valve disk 244a having a binding groove 244c formed therein, and a valve stem 244b is integrally formed with the valve disk 244a in the binding groove 244c to form the valve housing. It is configured to slide while penetrating through the guide hole (242a) of the.

The elastic member 246 is inserted into the valve groove 244c and inserted into the valve stem 244b to impart a restoring force to the valve stem 244b moving through the guide hole 242a.

The housing cover 248 has a fastening part 248b having a fitting protrusion 248a formed to be fastened to the fastening part 242b of the valve housing in order to prevent the valve body 244 from being separated.

The binding cover 249 binds the fastening portion 242b of the valve housing and the fastening portion 248b of the housing cover together and is seated on the stepped portion 212 formed in the connection pipe 200.

That is, the edge formed on the front surface of the first check valve 240 is a fastening portion 242b formed in the valve housing 242, a fastening portion 248b of the housing cover 248, and the fastening portion 242b, It is composed of a binding cover (249) for binding the 248b is seated on the stepped portion 212 of the inlet 211, is fixed while being fixed by the coupling with the straight pipe 100, the valve housing is the pipeline ( 213) It is seated inside.

In addition, as shown in FIG. 7B, in the case of the second check valve 250 seated on the connection part 220, each of the valve housing 252 and the housing cover 258 of the second check valve 250. Since the fastening parts 252b and 258b have the same configuration as the first check valve 240 described above except for the difference in shape structure and the difference that there is no binding cover, the repeated description will be omitted below.

In the case of the second check valve 250, the diameter of the valve may be determined by the diameter of the connection pipe, and the O-ring 258d is inserted into the fastening portion 258b of the housing cover 258 to prevent the outflow of running water. It can also be configured to prevent flow.

That is, the second check valve 250 is configured to be embedded in the conduit 222 of the connection part through the opening and closing part of the connection part 220 formed in the connection pipe 200.

As shown in Figure 8a, 8b, one end of the backflow prevention device according to the present invention is coupled to the water meter meter 10, the other end is coupled to the water supply pipe (20).

In detail, one side of the straight pipe 100 is coupled to the water meter meter 10, the connection pipe 200 is coupled to the water supply pipe 20, two check valves 240, 250 are connected to the pipe 200 It is mounted on.

Tap water is passed through the straight pipe 100 from the water meter meter 10, at which time the length of the straight pipe 100 is at least three times the diameter of the meter 10, the water meter meter 10 is supplied Accurately measure the volume of tap water.

When water is supplied from the main water pipe (not shown) to the water supply pipe 20 through an inlet pipe (not shown) and a water meter meter 10, by the pressure of the water supplied through the straight pipe 100 of the backflow prevention device. Each of the valve bodies 244 and 254 of the check valves 240 and 250 of the connection pipe 200 is subjected to a force. Hereinafter, the first check valve 240 installed at the inlet portion 210 side of the connecting pipe will be described, but the second check valve 250 is also applied in the same principle.

When the valve body 244 is subjected to hydraulic pressure, the valve body 244 is moved by pressure, whereby the elastic member 246 is compressed while being pressed by hydraulic pressure, and the valve body 244 is in an open state. Since the flow path is opened to the opening between the guide ribs 242c of the valve housing 242, a smooth flow of water is achieved.

Water flowing through the flow passage passes through the spaces between the plurality of guide ribs 242c formed on the outer surface of the housing case 242 so that the water is smoothly supplied through the water supply pipe 20.

In this case, in the case of the second check valve 250, when the hydraulic pressure acts on the valve disk 254a of the valve body 254, the valve stem 254b of the valve body 254 passes through the guide hole 252a. While moving to the groove 265 formed in the opening and closing cap 260, the valve disk 254 of the check valve 250 is opened while the water flows smoothly.

FIG. 8B is a cross-sectional view illustrating a closed state of a check valve of a connection pipe according to an exemplary embodiment of the present invention. In the description of the center of the first check valve 240 is installed on the inlet portion 210 side of the connection pipe 200, the second check valve 250 is also applied in the same principle.

When the valve body 244 which opens the flow path of the second check valve 240 due to the pressure of tap water has a large back pressure of tap water, the flow path of the valve housing 242 is changed by the restoring force of the elastic member 246. Will be blocked. Therefore, the flow path is automatically blocked by the return of the valve body 244 to prevent the back flow of water.

Similarly, in the case of the second check valve 250, the valve stem 254b of the valve body 254 located in the insertion groove 227a formed in the opening / closing cap 227 by the restoring force of the elastic member 256 is a guide hole ( Returning through 252a, the valve body 254 of the second check valve 250 closes the flow path.

9 is a perspective view and a cross-sectional view of the backflow prevention device equipped with a straight pipe according to a second embodiment of the present invention, Figure 10 is an exploded view of the backflow prevention device equipped with a straight pipe according to a second embodiment of the present invention. Perspective view. As shown, the overall shape can be formed in a Y shape by raising the shape of one side of the connecting pipe 200. Specifically, the connection part 220 connected to the inlet part 210 is configured to be upwardly angled from the center line of the inlet part, and the outlet part 230 is connected to the side surface of the conduit 222 so as to form a Y-shape as a whole. can do. Through this configuration, it is possible to form a short distance L ₂ from the front end of the first check valve to the center line of the water outlet.

In this way, by forming the entire shape of the connector pipe 200 in the Y-shape, by reducing the linear length (L ₂ ) of the connector to the maximum, the water outlet (230) of the connector pipe 200 and the fixed water supply pipe ( 20) lines can be connected in a straight line to combine and reduce the cost and effort to equip a separate additional equipment line as in the prior art.

11 is a perspective view and a cross-sectional view of a backflow prevention device equipped with a straight pipe according to a third embodiment of the present invention, Figure 12 is an exploded view of the backflow prevention device equipped with a straight pipe according to a third embodiment of the present invention. Perspective view.

As shown, the outer peripheral surface of the upper portion of the connecting portion 220 of the connecting pipe 200, the gauge mounting hole 229 for mounting a gauge (not shown) and the opening and closing plug 260 for opening and closing the gauge mounting hole 229 ) May be further configured. This can be configured to measure the pressure of tap water by mounting a gauge, such as a pressure gauge.

FIG. 13 is a perspective view and a cross-sectional view of a backflow prevention device equipped with a straight pipe according to a fourth embodiment of the present invention, and FIG. 14 is an exploded view of the backflow prevention device equipped with a straight pipe according to a fourth embodiment of the present invention. Perspective view.

As shown, as a backflow prevention device modified from the first embodiment of the present invention, the pipe 222 of the connecting portion 220 is formed to be expanded. To this end, the diameter D 'of the rear end of the locking step 221 is widened, and the second check valve 280 expanded through the opening and closing part is configured to be embedded therein.

Therefore, the second check valve 280 having a diameter larger than that of the first check valve 240 mounted on the inlet part 210 at the connecting part 220 can be mounted, so that the amount of water flowing into the connecting pipe 200 is increased. There is an advantage of increasing the water pressure.

FIG. 15 is a view illustrating a check valve mounted through an opening and closing portion of a connecting part in an expanded pipe according to a fourth embodiment of the present invention as shown in FIGS. 13 and 14. As shown in FIG. And a valve housing 282, a valve body 284, an elastic member 286, and a housing cover 288. The valve body 284 also includes a valve disc 284a and a valve stem 284b.

The valve housing 282 has a space formed therein, and a seating portion 282a on which one of the O-rings 282d for preventing water leakage is formed is formed stepwise, and a fastening portion 282b is formed on the other side thereof. A plurality of guide ribs 282c are formed to allow water to flow.

The valve body 284 is provided with a valve disc 284a having a valve stem 284b and is inserted into the inner space of the valve housing so as to slide, and the valve body 284 of the valve disc 284a of the valve body 284 is provided. Since the diameter is larger than the valve body of the check valves 240 and 250 described above, it is configured to allow more water to flow.

The elastic member 286 is configured to be inserted into the valve stem 284b to provide an elastic restoring force to the valve body 284.

The housing cover 288 has a plurality of flow path ribs 288a formed therein so that water flows between the flow path ribs 288a, and the valve stem 284b of the valve body and the elastic member 286 are fastened. The stem mounting rod 288b is provided at the central portion of the flow path rib 288a and has a fastening portion 288c having a fitting protrusion formed to be engaged with the fastening portion 282b of the valve housing.

16 and 17 illustrate a fifth embodiment of the present invention, in which a connecting portion 220 is expanded, and a connecting portion 220 shows a Y-shaped connector formed at an angle upward from a center line of the inlet portion 210. . As in the case of the above-described fourth embodiment, the expanded second check valve 280 is disposed in the conduit of the connecting portion at a predetermined angle in the expanded connecting portion 220. The specific configuration is different from that of the fourth embodiment in that the connection portion is formed at a predetermined angle in the upward direction, and the other configuration is the same as the fourth embodiment, and thus detailed description thereof will be omitted. According to this fifth embodiment, the distance from the front end of the first check valve to the centerline of the water outlet 230 can be configured to be considerably short. In addition, since the second check valve 280 is expanded, more flow rate can flow, and thus, there is an advantage that the water pressure can be increased.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

Figure 1 shows a state in which the connection valve for preventing the backflow is mounted on the water pipe according to the prior art.

2A and 2B show a cross-sectional view showing a non-return connection valve according to the prior art and a state in which the check valve of the non-return connection valve is mounted.

3 is a conceptual diagram illustrating a method of installing a meter of a water meter.

Figure 4 shows a problem in the case of installing a straight pipe in the conventional non-return connection valve.

5 is a perspective view and a cross-sectional view of a non-return apparatus equipped with a straight pipe according to a first embodiment of the present invention.

6 is an exploded perspective view of the backflow prevention device equipped with a straight pipe according to the first embodiment of the present invention.

7A and 7B are exploded perspective views showing the check valve used by the first embodiment according to the present invention.

8A and 8B show a state diagram of use of the backflow prevention device according to the first embodiment of the present invention.

9 is a perspective view and a cross-sectional view of a non-return apparatus equipped with a straight pipe according to a second embodiment of the present invention.

10 is an exploded perspective view of a backflow prevention device equipped with a straight pipe according to a second embodiment of the present invention.

11 is a perspective view and a cross-sectional view of a non-return apparatus equipped with a straight pipe according to a third embodiment of the present invention.

12 is an exploded perspective view of the backflow prevention device equipped with a straight pipe according to a third embodiment of the present invention.

13 is a perspective view and a cross-sectional view of the backflow prevention device equipped with a straight pipe according to a fourth embodiment of the present invention.

14 is an exploded perspective view of a backflow prevention device equipped with a straight pipe according to a fourth embodiment of the present invention.

15 is an exploded perspective view showing a check valve mounted in the fourth embodiment according to the present invention.

16 is a perspective view and a cross-sectional view of the backflow prevention device equipped with a straight pipe according to a fifth embodiment of the present invention.

17 is an exploded perspective view of a backflow prevention device equipped with a straight pipe according to a fifth embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: water meter meter 20: water pipe

100: straight pipe 200: connector

210: acquisition portion 220: connection portion

227: opening and closing cap 229: gauge mounting hole

230: water outlet 240: first check valve

250, 280: second check valve

242, 252: valve housing 244, 254: valve body

244a, 254a: valve disc 244b, 254b: valve stem

246, 256: elastic member 248, 258: housing cover

249: Bindings

260: opening and closing stopper

282: valve housing 284: valve body

286: elastic member 288: housing cover

Claims (9)

In the backflow prevention device having a dual check valve for connecting the water meter meter 10 and the water supply pipe 20, Straight pipe 100 is coupled to the rear end of the water meter meter 10; An inlet 210 formed with an inlet 211 that is coupled to the straight pipe 100 and a stepped portion 212 for fixing the valve and a conduit 213 having a predetermined length for seating the valve; A valve jaw 221 for preventing the flow of the valve formed at the rear end of the part 210 and a pipe 222 having a predetermined length in which a valve is seated at the rear end of the hook jaw 221 and a valve at the rear end of the pipe 222. Opening and closing portion 225 for the fixing and detachment of the insertion groove 227a is formed and the connecting portion 220 is formed with an opening and closing portion consisting of an opening and closing cap 227 for opening and closing the opening and closing 225, and the connecting portion 220 A water pipe that is curved at one side of the pipe line of the pipe 231 through which the fluid passing through the water inlet unit 210 is discharged and is connected to the pipe line 231 and has a water outlet 232 for mounting the water supply pipe 20. A connector 200 composed of a portion 230; A first check valve 240 having a front surface fixed to the stepped portion 212 of the inlet 211 and seated in the conduit 213 of the inlet 210; And The front surface is fixed to the locking step 221 formed on the rear end of the inlet 210 and the back is fixed by the opening and closing cap 227, the valve housing 252 and the inside of the valve housing is inserted into the insert The second check valve is composed of a valve body 254 moved back and forth through the groove 227a to open and close the flow path, and an elastic member 256 mounted between the end of the valve housing and the valve body to give elastic force to the valve body. 250; Backflow prevention device with a dual check valve, characterized in that consisting of. delete delete delete delete delete delete delete delete

Images