JP2009228812A - Check valve, pipe structure with check valve, pipe fitting with check valve, and basin equipped with check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve having a relatively simple structure, a comparatively simple assembly work of a valve element, and a good versatile structure. <P>SOLUTION: The check valve 10 is equipped with a valve seat 11 and valve element 12 approximately in a disc shape, and the valve seat 11 has a periphery 11a formed flat and an inside part 11b furnished with a shaft hole 11c to admit penetration of a shaft and a distribution hole 11d to allow a fluid to flow through. The valve element 12 has the shaft 12a to penetrate the shaft hole 11c and a valve body 12b approximately in a disc shape formed at one end of the shaft 11c and having a size as covering the distribution hole 11d in the valve seat 11 when viewed in the axial direction. The check valve 10 is arranged inside a tee 22b in the condition that the periphery 11a of the valve seat 11 is pinched by a socket 26 of the tee 22b and a spigot 24 of an elbow pipe 22a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a backflow prevention valve, a pipe structure with a backflow prevention valve, a pipe joint with a backflow prevention valve, and a visor equipped with a backflow prevention valve.

  Conventionally, a backflow prevention valve provided in a piping route or the like is known. Patent Document 1 below describes a check chamber including a substantially umbrella-shaped valve body (lift valve) as a kind of check valve.

The non-return chamber includes a chamber body integrally formed with a sliding cylinder extending in the vertical direction, and a beam extending radially from the sliding cylinder in a plan view, and a sliding shaft inserted through the sliding cylinder. A substantially umbrella-shaped lift valve. In this check chamber, when an upward flow occurs in the chamber body, the lift valve is pushed upward by the fluid pressure, and the flow path is opened. On the other hand, when the flow stops, the lift valve falls by its own weight, and the flow path is closed by the lift valve.
Japanese Utility Model Publication No. 56-143668

  In the check chamber, the valve seat that receives the valve body (lift valve) is formed integrally with the chamber body. Therefore, the valve seat must be formed in accordance with the individual shape of the chamber body. As a result, the check chamber tends to be complicated in structure. In addition, the operation of attaching the valve body is complicated. Furthermore, it has a structure with poor versatility.

  The present invention has been made in view of the above points, and the object of the present invention is to have a relatively simple structure, a relatively simple valve body mounting operation, and a versatile structure. The object is to provide a check valve.

  A backflow prevention valve according to the present invention is a substantially disc-shaped valve seat having an outer peripheral portion formed in a flat plate shape, and an inner portion formed with a shaft hole through which a shaft can be inserted and a flow hole through which fluid flows. A valve body having a shaft inserted through the shaft hole, and a substantially disc-shaped valve body formed on one end side of the shaft and covering the flow hole of the valve seat as viewed from the axial direction; , And the outer peripheral portion of the valve seat is disposed inside the tubular member in a state of being sandwiched between a receiving port and a differential port of the tubular member.

  According to the backflow prevention valve, the valve seat is disposed inside the tubular member in a state of being sandwiched between the receiving port and the differential port of the tubular member, and the valve seat is integrated with the tubular member. Absent. Therefore, it is not necessary to form a valve seat according to the shape of the tubular member, and the structure becomes relatively simple. Moreover, versatility can be improved. Further, the backflow prevention valve can be fixed simply by attaching the valve body to the valve seat and inserting the valve seat into the receiving port with the valve seat interposed between the receiving port and the connecting port. Therefore, the mounting operation can be performed relatively easily.

  It is preferable that the backflow prevention valve further includes a seal member provided on a surface of the valve body facing the valve seat or a surface of the valve seat facing the valve body.

  As a result, the backflow prevention function can be further improved.

  A pipe joint with a backflow prevention valve according to the present invention is arranged in a pipe joint body in which a receiving port or a differential port is formed on one end side and a receiving port is formed on the other end side, and in the receiving port of the pipe fitting body. And the backflow prevention valve.

  According to the pipe joint with a backflow prevention valve, it is possible to realize a pipe joint having the above-described effects as well as the backflow prevention function.

  According to the present invention, an inflow port and an outflow port are formed, an approximately bottomed cylindrical main body extending in the vertical direction, one end connected to the main body outflow port, and the other end is an upward receiving port or a difference. An elbow tube with a mouth formed, a downward opening inserted into the upward receiving port of the elbow tube, a downward receiving port into which the upward opening of the elbow tube is inserted, and a lateral or oblique lateral receiving port or A cheese formed with an opening, an upward receiving port or an opening, an inspection tube connected to the upward receiving port or the opening of the cheese and extending in the vertical direction, and an upward receiving port of the elbow tube And the reverse flow prevention valve sandwiched between the upward opening of the elbow tube and the downward receiving opening of the cheese.

  According to the above, it is possible to achieve the above-described effect as well as the backflow prevention function.

  The tube structure with a backflow prevention valve according to the present invention includes a first tubular member having a receiving port, a second tubular member having a differential port inserted into the receiving port, and a receiving port for the first tubular member. And the backflow prevention valve sandwiched between the second tubular member and the outlet of the second tubular member.

  Another tube structure with a backflow prevention valve according to the present invention is a tubular member having a receiving port, a tube inserted into the receiving port, and the backflow sandwiched between the receiving port of the tubular member and the tube. And a prevention valve.

  According to each of the above-described tube structures with a backflow prevention valve, it is possible to realize a tube structure having the above-described effects as well as a backflow prevention function.

  The valve seat and the valve main body are formed in a substantially horizontal disk shape, the axis of the valve body is an axis extending in the vertical direction, and around the flow hole in the valve seat, the valve seat extends upward. A tapered surface is preferably formed.

  As a result, foreign matters such as sand and dust that tend to accumulate in the valve seat easily fall along the tapered surface. This makes it difficult for foreign matter to be sandwiched between the valve seat and the valve body. As a result, the opening / closing operation of the valve body can be stabilized, and the backflow prevention function can be enhanced.

  ADVANTAGE OF THE INVENTION According to this invention, the structure which is comparatively simple, the attachment operation | work of a valve body is comparatively easy, and it can implement | achieve the backflow prevention valve which has a structure full of versatility. It is also possible to realize a pipe structure, a pipe joint, and a mass having such a backflow prevention valve.

<Embodiment 1>
《Rainwater drainage pipe structure》
As shown in FIG. 1, the backflow prevention valve 10 according to the first embodiment is provided inside a final basin 20 that is a part of a rainwater drainage pipe structure 100. The drainage pipe structure 100 includes a rainwater storage and permeation tank 101 and a final tank 20, and discharges rainwater in the house to a side groove 102 outside the house. Although illustration is omitted, a plurality of piping systems are provided in the house. Rainwater that has flowed through these piping systems merges and flows into the rainwater storage and penetration tank 101 or joins in the rainwater storage and penetration tank 101. The rainwater collected in the rainwater storage and penetration tank 101 is finally supplied to 20. That is, the rainwater in the house is finally collected at one place in the final 20.

  Here, the term “in-house” refers to, for example, a site such as a detached house or a store, and is a site owned by an individual, a corporation, another group, or the like. On the other hand, outside the house is a public site.

  The rainwater storage and penetration tank 101 is connected to a pipe 103 for introducing rainwater from a rain gutter in a house or the like (not shown). The rainwater storage and penetration tank 101 and the final basin 20 are connected via a pipe 104. The final cylinder 20 and the side groove 102 are connected via a pipe 105. With such a structure, the drainage pipe structure 100 discharges rainwater introduced from the pipe 103 to the side groove 102 outside the house through the rainwater storage and penetration tank 101, the pipe 104, the final tank 20, and the pipe 105. In FIG. 1, the code | symbol G represents the ground. The rainwater storage and permeation tank 101 and the final tank 20 are buried in the ground, and the entire drainage pipe structure 100 is buried in the ground.

  The drainage pipe structure 100 is not limited to the one that discharges rainwater collected in the house to the side groove 102 as in the present embodiment, but the rainwater main (in which rainwater collected in the house is embedded in the ground outside the house ( It may be one that is discharged (not shown).

《Let's do it》
As shown in FIG. 2 and FIG. 3, the final mass 20 is composed of a water collecting mass 21 and an auxiliary mass 22. As shown in FIG. 2, the water collecting basin 21 includes a bottomed cylindrical bottom portion 21a, a substantially cylindrical body portion 21b connected to the upper side of the bottom portion 21a, and a substantially cylindrical shape connected to the upper side of the body portion 21b. And a lid 21e that covers an inspection port 21d formed on the upper side of the upper portion 21c. The bottom portion 21a, the trunk portion 21b, and the upper portion 21c constitute a main body. A receiving port 21f to which the tube 104 is connected is formed on the side of the body portion 21b. An inflow port 21g for the body portion 21b is formed inside the receiving port 21f. An outlet 21h is formed at the side of the bottom 21a.

  The auxiliary trough 22 includes an elbow tube 22a curved upward from the side, a T-shaped cheese 22b connected to the upper end of the elbow tube 22a, and a substantially cylindrical inspection connected to the upper side of the cheese 22b. A cylinder 22c and a lid 22e that covers an inspection port 22d formed on the upper side of the inspection cylinder 22c are provided. The upstream end (that is, the lower end portion) of the elbow pipe 22 a is connected to the side portion of the bottom portion 21 a of the water collecting tank 21. In addition, although the elbow pipe 22a and the bottom part 21a of the water collecting basin 21 may be separate members, they may be the same member as in the present embodiment. That is, the elbow pipe 22a and the bottom 21a of the water collecting basin 21 may be integrally formed.

  As shown in FIG. 4, the lid 22e is a so-called lattice lid, and a plurality of holes 25 are formed in the lid 22e. Note that the lid 21e of the water collecting basin 21 has the same configuration as the lid 22e, and a plurality of holes 25 are also formed in the lid 21e (see FIG. 2). Such a hole 25 is useful in that it collects rainwater on the surface and releases the pressure. However, the hole 25 may not be formed in the lid 21e or the lid 22e. That is, the lid 21e or the lid 22e may be a sealed lid in which no hole is formed.

《Backflow prevention valve》
The backflow prevention valve 10 includes a substantially disc-shaped valve seat 11 and an umbrella-shaped valve body 12. The backflow prevention valve 10 is disposed inside the auxiliary cylinder 22 with the valve seat 11 being sandwiched between the outlet 24 of the elbow 22a and the receiving port 26 of the cheese 22b.

  As shown in FIGS. 5A and 5B, the valve seat 11 has an inner portion 11b and an outer peripheral portion 11a. The outer peripheral portion 11a is a portion sandwiched between the outlet 24 of the elbow tube 22a and the receiving port 26 of the cheese 22b, and is formed in a flat plate shape (see FIG. 5B). The inner portion 11b is formed with a shaft hole 11c through which a shaft can be inserted and a circulation hole 11d through which rainwater flows. In the present embodiment, four circulation holes 11d are formed. However, the shape and the number of the flow holes 11d are not limited to those of this embodiment. The inner portion 11b and the outer peripheral portion 11a may be integrated as in the present embodiment, but may be separate. For example, a convex part or a concave part can be formed on the outer peripheral part of the inner part 11b, a concave part or a convex part can be formed on the inner peripheral part of the outer peripheral part 11a, and the convex part and the concave part of the inner part 11b and the outer peripheral part 11a can be engaged. By doing so, the inner portion 11b and the outer peripheral portion 11a may be detachable. Thereby, it becomes possible to remove easily the other part of the backflow prevention valve 10 except the outer peripheral part 11a, and cleaning and inspection can be performed easily.

  As shown in FIGS. 6A and 6B, the valve body 12 includes a shaft 12a, a valve body 12b formed on the upper end side of the shaft 12a, and a stopper 12c provided on the lower end side of the shaft 12a. I have. The shaft 12a is slidably inserted into the shaft hole 11c of the valve seat 11, and the outer diameter of the shaft 12a is slightly smaller than the inner diameter of the shaft hole 11c. The valve body 12b is formed in a substantially disk shape having a size covering the flow hole 11d of the valve seat 11 when viewed from the axial direction, that is, in plan view. The upper surface of the valve body 12b is an inclined surface that is gently inclined from the center side toward the radially outer side. A protruding portion 12d that protrudes downward is formed on the outer peripheral side of the lower surface of the valve body 12b. A seal ring 12e is fitted into the protruding portion 12d. Specifically, a depression is formed on the circumference of the bottom surface of the protruding portion 12d, and a seal ring 12e is press-fitted into the depression. The stopper 12c is for preventing the valve body 12 from being detached from the valve seat 11 when the valve body 12 moves upward (see FIG. 7), and is formed in an annular shape larger than the shaft hole 11c.

<Operation of check valve>
As shown in FIG. 7, when rainwater flows from the water collecting tank 21 toward the auxiliary tank 22, the valve body 12 of the check valve 10 is pushed up by the rainwater flow, and the flow hole 11 d of the valve seat 11 is opened. Thereby, rainwater flows in the elbow pipe 22a from the lower side to the upper side. That is, rainwater flows through the auxiliary tank 22 from the upstream side toward the downstream side.

  On the other hand, when there is no rainwater flow in the auxiliary tank 22, the valve body 12 moves downward due to its own weight, and the flow hole 11d of the valve seat 11 is closed as shown in FIG. Further, when rainwater flows from the side groove 102 toward the final 20, that is, when rainwater flows backward from the downstream side toward the upstream side, the valve body 12 is placed on the valve seat 11, The flow hole 11d of the valve seat 11 is closed. Therefore, the backflow of rainwater is prevented.

《About the sealed part》
A virtual line W in FIG. 2 represents the water surface when rainwater is not flowing. In this way, even when rainwater is not circulating, a predetermined amount of water is collected at the bottom of the water collecting tank 21 and the auxiliary tank 22. As a result, a sealed portion S is formed from the bottom portion 21a of the water collecting basin 21 to the elbow pipe 22a of the auxiliary basin 22.

  The backflow prevention valve 10 not only prevents the backflow of rainwater, but also prevents intrusion of off-flavors, pests and the like from the downstream side to the upstream side. In the present embodiment, the sealed portion S is further formed in the final 20, and the sealed portion S also prevents intrusion of off-flavors, pests, and the like. That is, the invasion of off-flavors, pests, and the like is double prevented by the backflow prevention valve 10 and the sealing portion S.

<How to install the backflow prevention valve>
The backflow prevention valve 10 according to the present embodiment can be attached as follows. First, the valve body 12 is attached to the valve seat 11 in advance. That is, the backflow prevention valve 10 is assembled. Specifically, the shaft 12a of the valve body 12 is inserted into the shaft hole 11c of the valve seat 11, and a stopper 12c is attached to the tip of the shaft 12a.

  Next, the check valve 10 assembled in this way is attached to the inside of the receptacle 26 of the cheese 22b or the upper end of the outlet 24 of the elbow pipe 22a. In addition, although the fixing method of the backflow prevention valve 10 is not specifically limited, For example, it can fix using an adhesive agent etc. Further, at this stage, the backflow prevention valve 10 may be simply fitted into the receiving port 26 or placed on the upper end of the insertion port 24 without being fixed with an adhesive or the like.

  Next, the receiving port 26 of the cheese 22b is fitted into the insertion port 24 of the elbow tube 22a. As a result, the outer peripheral portion 11 a of the valve seat 11 of the check valve 10 is sandwiched between the receiving port 26 and the outlet 24, and the check valve 10 is fixed in the receiving port 26. Thereafter, the receiving port 26 of the cheese 22b and the insertion port 24 of the elbow tube 22a are bonded using an adhesive or the like. Since the backflow prevention valve 10 is interposed between the receiving port 26 and the differential port 24, the backflow prevention valve 10 is also fixed to the receiving port 26 and the differential port 24 at this time.

<< Effects of the Embodiment >>
As described above, according to the backflow prevention valve 10 according to the present embodiment, the valve seat 11 is a separate member from the cheese 22b and the elbow pipe 22a, and the outer peripheral portion 11a of the valve seat 11 is the receiving port for the cheese 22b. 26 and between the elbow tube 22a and the outlet 24 of the elbow tube 22a, it is arranged inside the cheese 22b and the elbow tube 22a. Therefore, it is not necessary to integrally form the valve seat 11 according to the shape of the cheese 22b or the elbow pipe 22a, and the structure of the valve seat 11 can be simplified.

  In addition, according to the backflow prevention valve 10 according to the present embodiment, the valve body 12 is attached to the valve seat 11, and the valve seat 11 is interposed between the receiving port 26 and the inserting port 24, and is inserted into the receiving port 26. It can be easily fixed simply by inserting the mouth 24. Therefore, the installation work of the backflow prevention valve 10 can be easily performed.

  Moreover, according to the backflow prevention valve 10 which concerns on this embodiment, it can install easily in the connection part of the arbitrary tubular members which have a receiving port, and the arbitrary tubular members which have a difference port. If tubular members having matching pipe diameters (for example, 75 mm, 100 mm, etc.) are prepared, they can be easily installed regardless of the type of tubular member. Therefore, a highly versatile backflow prevention valve can be realized.

  Moreover, according to this embodiment, the seal ring 12e is provided in the surface facing the valve seat 11 of the valve main body 12b. Therefore, the adhesion of the valve body 12 to the valve seat 11 can be improved, and the backflow prevention function can be further improved. In this embodiment, the seal ring 12e is provided on the surface of the valve body 12b facing the valve seat 11, but the seal ring 12e may be provided on the surface of the valve seat 11 facing the valve body 12b. Good. In this case, the same effect can be obtained.

  The auxiliary mass 22 (or the final mass 20) according to the present embodiment is a gut incorporating the backflow prevention valve 10. Therefore, according to the above-mentioned auxiliary box 22 (or finally 20), it is possible to realize more and more having a backflow prevention function. In addition, by using a gas containing the backflow prevention valve 10 in this way, it is not necessary to separately provide a backflow prevention valve in the middle of the pipe of the drainage pipe structure 100. Therefore, the operation | work at the time of laying drainage pipe structure 100 can be simplified.

  In the present embodiment, three receptacles 26 are formed in the cheese 22b. However, any one, any two, or all of the receptacles 26 of the cheese 22b may be a slot. In addition, when changing the downward receiving port 26 of cheese 22b into an insertion port, the upward opening 24 of the elbow pipe 22a is changed into an receiving port.

  According to this embodiment, the backflow prevention valve 10 is arranged inside the auxiliary housing 22 having the inspection port 22d. Further, the backflow prevention valve 10 is disposed so that at least a part thereof is positioned below the inspection port 22d. Therefore, the maintenance work of the backflow prevention valve 10 such as removing dust on the valve seat 11 can be performed through the inspection port 22d. Therefore, after the drainage pipe structure 100 is laid, the maintenance work of the backflow prevention valve 10 can be performed relatively easily.

  Moreover, according to this embodiment, the sealing part S is formed ranging from the bottom part 21a of the water collecting basin 21 to the elbow pipe 22a of the auxiliary 22 part. In other words, at least a part of the sealed water portion S is formed on the upstream side of the backflow prevention valve 10 inside the auxiliary tank 22. For this reason, the sealing portion S together with the backflow prevention valve 10 can also prevent the intrusion of a strange odor, a pest or the like into the upstream side. In other words, it is possible to prevent double penetration of a strange odor or pests into the upstream side. Even if the sealed water in the sealed water portion S is depleted, the intrusion of a strange odor or a pest is blocked by the backflow prevention valve 10.

<Modification>
As shown in FIG. 5B, in the check valve 10 according to the above embodiment, a vertical surface 11 f extending vertically is formed around the flow hole 11 d of the valve seat 11. However, as shown in FIG. 9, a tapered surface 11 g that spreads upward may be formed around the circulation hole 11 d of the valve seat 11.

  As described above, by forming the tapered surface 11g around the circulation hole 11d, foreign matters such as sand and dust attached to the circumference of the circulation hole 11d of the valve seat 11 are likely to fall naturally. Therefore, it is difficult for foreign matter to collect around the circulation hole 11 d of the valve seat 11, and it is possible to suppress foreign matter from being caught between the valve body 12 and the valve seat 11. Therefore, the opening / closing operation of the valve body 12 is stabilized. Moreover, the flow hole 11d can be closed more reliably, and a more stable backflow prevention effect can be obtained.

  In particular, in the above embodiment, the inspection port 22d is formed above the check valve 10. Although the inspection port 22d is covered with a lid 22e, a hole 25 is formed in the lid 22e. Therefore, compared to the case where the hole 25 is not formed in the lid 22e, the ground sand, dust, and the like can easily enter the inside of the support 22. Therefore, the above-mentioned effect becomes more useful.

<Embodiment 2>
As shown in FIG. 10, the backflow prevention valve 10 according to the second embodiment is provided inside the pipe joint 40. The pipe joint 40 is connected to an outlet 51 of the concrete mass 50 and is disposed inside the concrete mass 50. A pipe 104b for introducing rainwater is connected to the inlet 52 of the concrete mass 50. An inspection port 55 is formed on the upper side of the concrete mass 50. A pipe 105 is connected to the pipe joint 40 for discharging rainwater from the concrete mass 50 toward a side groove (not shown in FIG. 10; see reference numeral 102 in FIG. 1).

  As shown in FIG. 11, the pipe joint 40 includes an elbow pipe 41, a cylindrical pipe 44, and the backflow prevention valve 10. An elbow 42 is formed at one end of the elbow 41 and a receiving port 43 is formed at the other end. A tube 105 is fitted into the insertion opening 42 (see FIG. 10). Note that a receiving port may be formed at one end of the elbow pipe 41 instead of the differential port 42. A tube 44 is fitted into the receiving port 43. In the present embodiment, the length of the tube 44 is substantially equal to the length of the receiving port 43 (strictly, it is equal to the length obtained by adding the depth dimension of the receiving port 43 and the thickness of the valve seat 11). It does not protrude from the receiving port 43. However, a part of the tube 44 may protrude from the receiving port 43. In the present embodiment, the tube 44 is fitted into the receiving port 43 and plays a role as a so-called outlet. Of course, it is possible to fit a tube having a gap into the receiving port 43 instead of the tube 44.

  The configuration of the check valve 10 is the same as that of the first embodiment. In the present embodiment, the valve seat 11 of the check valve 10 is sandwiched between the receiving port 43 and the upper end of the pipe 44.

  The symbol W in FIG. 10 represents the water surface in the concrete mass 50 when rainwater is not flowing. Thus, even when rainwater is not circulating, a predetermined amount of water is accumulated in the concrete mass 50, and the lower end portion of the pipe joint 40 is immersed in the water. As a result, a sealed portion S is formed from the bottom of the concrete mass 50 to the lower end of the pipe joint 40.

  As in the first embodiment, the backflow prevention valve 10 not only prevents the backflow of rainwater but also prevents intrusion of off-flavors, pests and the like from the downstream side to the upstream side. Also in this embodiment, invasion of off-flavors, pests, and the like is double prevented by the backflow prevention valve 10 and the sealing portion S.

  The pipe joint 40 is assembled by fitting the pipe 44 into the receiving port 43 in a state where the backflow prevention valve 10 is disposed in the receiving port 43 of the elbow pipe 41. As in the first embodiment, the backflow prevention valve 10 is also fixed in the receiving port 43 by adhering the tube 44 and the receiving port 43 as the outlet.

  According to this embodiment, the pipe joint 40 having a backflow prevention function can be realized. Also in the present embodiment, the valve seat 11 is disposed inside the elbow pipe 41 in a state of being sandwiched between the receiving port 43 of the elbow pipe 41 and the pipe 44 as the outlet, The valve seat 11 is not integral with the elbow pipe 41. Therefore, it is not necessary to form a valve seat on the elbow pipe 41, and a pipe joint having a backflow prevention function can be obtained with a relatively simple structure. In addition, the same effects as those of the first embodiment can be obtained.

  As in the first embodiment, in the present embodiment, a tapered surface that extends upward may be formed around the flow hole 11d of the valve seat 11.

<Other embodiments>
In each of the above embodiments, the backflow prevention valve 10 is provided in the rainwater path. However, the backflow prevention valve, the pipe structure with the backflow prevention valve, the pipe joint with the backflow prevention valve, and the backflow prevention valve according to the present invention are provided. The installation location of the masu is not limited to the rainwater route, but may be a so-called miscellaneous drainage route connected to a washbasin or a bath, or a sewage route with a filter etc. on the upstream side. May be.

  As described above, according to the present invention, the backflow prevention valve, the pipe structure with the backflow prevention valve, the pipe joint with the backflow prevention valve, and the backflow prevention valve are useful.

1 is a configuration diagram of a rainwater drain pipe structure according to Embodiment 1. FIG. FIG. It is a final top view. It is a top view of a lid | cover. (A) is a top view of a valve seat, (b) is the Vb-Vb sectional view taken on the line of (a). (A) is a side view of a valve body, (b) is a back view of a valve body. It is a longitudinal cross-sectional view of the auxiliary | assistant apparatus in the state which the valve body of the backflow prevention valve opened. It is a longitudinal cross-sectional view of the auxiliary | assistant apparatus in the state which the valve body of the backflow prevention valve closed. It is sectional drawing of the valve seat which concerns on a modification. It is a block diagram of the drainage pipe structure of the rain water which concerns on Embodiment 2. FIG. It is sectional drawing of the pipe joint provided with the backflow prevention valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Backflow prevention valve 11 Valve seat 11a Outer peripheral part 11b Inner part 11c Shaft hole 11d Flow hole 11g Tapered surface 12 Valve body 12a Shaft 12b Valve main body 12e Seal ring (seal member)
20 Final 21 Collect water 22 Assist 22a Elbow pipe (tubular member)
22b Cheese (tubular member)
22c Inspection cylinder 24 Differential port 26 Receiving port 40 Pipe fitting (pipe structure with backflow prevention valve, pipe fitting with backflow prevention valve)
41 Elbow pipe (Fitting body)
42 outlet 43 receiving port 44 pipe

Claims (8)

A substantially disc-shaped valve seat having an outer peripheral part formed in a flat plate shape, an inner part formed with a shaft hole through which a shaft can be inserted and a flow hole through which fluid flows;
A valve body having a shaft inserted into the shaft hole, and a substantially disc-shaped valve body formed on one end side of the shaft and covering the flow hole of the valve seat as viewed from the axial direction;
With
The backflow prevention valve which is arrange | positioned in the inside of the said tubular member in the state by which the said outer peripheral part of the said valve seat was pinched | interposed between the receiving port and the outlet of a tubular member. A seal member provided on a surface of the valve body facing the valve seat or a surface of the valve seat facing the valve body;
The backflow prevention valve according to claim 1. A fitting body in which a receiving port or a differential port is formed on one end side and a receiving port is formed on the other end side;
The backflow prevention valve according to claim 1 or 2, which is disposed in the receiving port of the pipe joint body,
A pipe fitting with a backflow prevention valve. An inflow body and an outflow opening are formed, and a substantially bottomed cylindrical main body extending in the vertical direction;
One end is connected to the outlet of the main body, and the other end is an elbow tube with an upward receptacle or outlet formed thereon.
A downward opening inserted into the upward receiving port of the elbow pipe or a downward receiving port into which the upward opening of the elbow pipe is inserted; a lateral or oblique lateral receiving port or opening; and an upward receiving port or A cheese with a gap,
An inspection tube connected to the cheese's upward receptacle or outlet and extending vertically.
The sandwiched between the upward receiving port of the elbow tube and the downward opening of the cheese, or sandwiched between the upward opening of the elbow tube and the downward receiving port of the cheese. A check valve described in
With. A first tubular member having a receptacle;
A second tubular member having a slot inserted into the receptacle;
The backflow prevention valve according to claim 1 or 2, sandwiched between a receiving port of the first tubular member and a differential port of the second tubular member,
A tube structure with a backflow prevention valve. A tubular member having a receptacle;
A tube inserted into the receptacle;
The backflow prevention valve according to claim 1 or 2, sandwiched between the receiving port of the tubular member and the pipe,
A tube structure with a backflow prevention valve. The valve seat and the valve body are formed in a substantially horizontal disk shape,
The axis of the valve body is an axis extending in the vertical direction,
Around the circulation hole in the valve seat, a tapered surface is formed so as to spread upward.
A pipe joint with a check valve according to claim 3. The valve seat and the valve body are formed in a substantially horizontal disk shape,
The axis of the valve body is an axis extending in the vertical direction,
Around the circulation hole in the valve seat, a tapered surface is formed so as to spread upward.
It is described in claim 1.

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