JP2017009026A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve which can be installed at a midway position of piping, and can keep a posture after the installation.SOLUTION: A check valve 1 is equipped with a valve box 2 equipped with an inflow port 11 and an outflow port 15; a valve body 3 stored in the valve box 2; and a flange 5 projecting out to an outer peripheral side from the valve box 2. A first end surface 8 of the flange 5 is equipped with a first inside annular surface 34, a first annular recessed portion 33, and a first outside annular surface 35 from the inside toward the outside. A tenth ring 6 is attached to the first annular recessed portion 33. The check valve 1 sandwiches the flange 5 between a primary side pipe 61 and a secondary side pipe 62 of a water pipe 60, and is installed while the valve body 2 is inserted in the secondary side pipe 62. While the check valve 1 is installed, the tenth ring 6 is elastically deformed, and the first inside annular surface 34 and the first outside annular surface 35 of the flange 5 abut on an annular end surface 61a of the primary side pipe 61. Thereby, an installation posture of the check valve 1 is maintained.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a check valve installed in the middle of a water supply pipe.

  Such a check valve is described in Patent Document 1. The check valve of Patent Document 1 has a valve box having a liquid inlet and a liquid outlet, and a valve body that is housed in the valve box and opens and closes the fluid inlet. The check valve includes an annular flange protruding from the valve box to the outer peripheral side, and an annular rubber packing attached to the flange from the outer peripheral side and covering the front and rear end surfaces of the flange.

  The check valve has a flange between the primary side pipe (upstream side pipe) and the secondary side pipe (downstream side pipe) constituting the water pipe, and a valve box is inserted in the water pipe. Installed coaxially. The rubber packing is interposed between the first end face of the flange facing the primary side pipe and the primary side pipe, and in an elastically deformed state, seals between them in a liquid-tight manner. The rubber packing is interposed between the second end face of the flange facing the secondary side pipe and the secondary side pipe, and in a state of being elastically deformed, the space between them is liquid-tightly sealed. To do.

Japanese Patent No. 11-67998

  In a pipe buried in the ground, misalignment may occur between the primary side pipe and the secondary side pipe due to earth pressure or the like. In such a case, if a check valve is installed while aligning the primary side pipe and the secondary side pipe, a biased force in a direction crossing the axial direction of the pipe acts on the check valve.

  Here, in a state where the check valve is installed in the middle of the piping, rubber packing is interposed between the flange and the primary side piping and between the flange and the secondary side piping. Therefore, if a biased force is applied to the check valve, the rubber packing may not be elastically deformed uniformly, and the check valve axis may face a different direction from the piping axis.

  If the check valve axis and the piping axis are in different directions, the flow of liquid will be non-uniform, so the flow rate will be reduced compared to when the check valve is mounted in a predetermined position. Sometimes. Moreover, since the flow of the liquid becomes uneven, the check valve may vibrate. When the check valve vibrates, abnormal noise may be generated or the check valve may be damaged due to the vibration.

  The subject of this invention is providing the non-return valve which can maintain the installation attitude | position installed in the middle position of piping in view of such a point.

In order to solve the above problems, a check valve according to the present invention includes a valve box having a liquid inlet and a liquid outlet, a valve body housed in the valve box for opening and closing the liquid inlet, and the valve An annular flange projecting outward from the box, and the valve box is inserted into the liquid circulation pipe with the flange interposed between the primary pipe and the secondary pipe constituting the liquid circulation pipe The check valve installed in a state has an annular first elastic member that elastically deforms between the flange and the primary side pipe and seals the flange and the primary side pipe in a liquid-tight manner. The first end surface facing the primary side pipe in the flange has a surface facing the primary side pipe when the first elastic member is elastically deformed between the primary side pipe and the flange. A first abutting portion capable of abutting is provided.

  According to the present invention, the first elastic member is elastically deformed when the check valve is installed in a state where the flange is sandwiched between the primary side pipe and the secondary side pipe and the valve box is inserted into the liquid circulation pipe. The gap between the first end face of the flange and the primary side pipe is sealed in a liquid-tight manner. Further, when the first elastic member is elastically deformed, the first abutting portion of the flange abuts the primary side pipe on the surface, so that the abutment position of the check valve with respect to the primary side pipe is determined by the abutment. Stipulated in Furthermore, even when a biased force in the direction intersecting the axial direction of the liquid flow pipe acts on the installed check valve, the first abutting portion of the flange and the primary side pipe are in contact with each other. The stop valve can be maintained in the installed position.

  In the present invention, an annular second elastic member that elastically deforms between the flange and the secondary side pipe and seals the flange and the secondary side pipe in a liquid-tight manner is provided. The second end surface facing the secondary side pipe is a second end surface that can contact the secondary side pipe when the second elastic member is elastically deformed between the secondary side pipe and the flange. It is desirable to provide a contact portion. In this way, when the check valve is installed in the middle of the liquid flow pipe, the second elastic member is elastically deformed to liquid tightly seal between the second end face of the flange and the secondary pipe. . Further, when the second elastic member is elastically deformed, the second abutting portion of the flange abuts on the surface of the secondary side pipe, so that the check valve is installed in a predetermined posture with respect to the secondary side pipe by this abutment. Stipulated in Furthermore, even when a biased force acting in the direction intersecting the axial direction of the liquid flow pipe acts on the installed check valve, the second abutting portion of the flange and the secondary side pipe are in contact with each other. The stop valve can be reliably maintained in the installed position.

  In the present invention, in order to provide the first contact portion on the first end surface of the flange, the first end surface is a first annular recess surrounding the valve box, and a first annular recess located on the inner peripheral side of the first annular recess. A first inner annular surface, and a first outer annular surface located on the outer peripheral side of the first annular recess, wherein the first elastic member is attached to the first annular recess, and the first inner annular surface The first outer annular surface may be the first contact portion.

  In the present invention, in order to provide the second contact portion on the second end surface of the flange, the second end surface is positioned on the inner peripheral side of the second annular recess and the second annular recess surrounding the valve box. A second inner annular surface, and a second outer annular surface located on the outer peripheral side of the second annular recess, wherein the second elastic member is attached to the second annular recess, The annular surface and the second outer annular surface may be the second contact portion.

  In the present invention, in order to liquid-tightly seal between the flange and the primary side pipe and between the flange and the secondary side pipe, the first elastic member and the second elastic member are respectively O-rings. be able to.

  In the present invention, the O-ring may have a rectangular cross section. If it does in this way, it will be easy to ensure the contact area which each O-ring and each piping closely_contact | adhere.

  In the present invention, the flange is preferably made of metal. In this way, it is possible to prevent the flange from being deformed even when a biased force acting in a direction intersecting the axial direction of the liquid flow pipe acts on the installed check valve. Accordingly, the installation posture of the check valve can be reliably maintained.

  According to the present invention, the installation posture of the check valve can be maintained in a predetermined posture.

It is the perspective view and side view of a check valve of the present invention. It is sectional drawing of a non-return valve. It is a disassembled perspective view of a check valve. It is sectional drawing of the state which installed the check valve in the middle position of the water pipe. It is sectional drawing of the non-return valve of the modifications 1,2.

  Hereinafter, a check valve according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1A is a perspective view of a check valve to which the present invention is applied, and FIG. 1B is a side view of the check valve. 2A is a cross-sectional view of the check valve in a state where the valve body is in the closed position, and FIG. 2B is a cross-sectional view of the check valve in a state where the valve body is in the open position. FIG. 3 is an exploded perspective view of the check valve.

  The check valve of this example is installed in the middle of the water pipe. As shown in FIG. 1, the check valve 1 includes a valve box 2, a valve body 3 housed inside the valve box 2, and a coil spring 4. Further, the check valve 1 includes an annular flange 5 protruding from the valve box 2 to the outer peripheral side, and a first O ring 6 and a second O ring 7 attached to the front and back surfaces of the flange 5, respectively. In the following description, the direction of the axis L of the check valve 1 is the front-rear direction X, the side opposite to the side where the flange 5 is located is the front X1 (front side) of the check valve 1, and the side where the flange 5 is located is non-returned. Let it be the rear X2 (rear side) of the valve 1. The first O-ring 6 is attached to the first end face 8 facing the rear X 2 of the flange 5, and the second O-ring 7 is attached to the second end face 9 facing the front X 1 of the flange 5.

  As shown in FIG. 2, the valve box 2 is arranged coaxially with an annular valve seat portion 12 having an inflow port (liquid inflow port) 11 and a space between the valve seat portion 12 at a front X1 of the valve seat portion 12. And the three ribs 14 that connect the valve seat 12 and the bottom 13. The three ribs 14 are provided around the axis L at equal angular intervals. Between each rib 14 in the circumferential direction, there is an outlet (liquid outlet) 15.

  The valve seat portion 12 includes a tubular portion 17 and an annular valve seat packing 18 fixed to the inner peripheral side of the tubular portion 17. The valve seat packing 18 is a valve seat with which the valve body 3 abuts, and defines an opening edge on the front side of the inlet 11 in the valve seat portion 12. The three ribs 14 extend in the direction of the axis L from the front end edge of the cylindrical portion 17. The flange 5 protrudes in the radial direction from the rear end portion of the cylindrical portion 17 to the outer peripheral side.

  The bottom portion 13 includes a circular end plate portion 21 that faces the inflow port 11, an annular tapered wall portion 22 that extends from the outer periphery of the end plate portion 21 toward the rear X 2 toward the outer periphery, and a central portion of the end plate portion 21. A support shaft 23 that protrudes from the shaft and extends coaxially with the tapered wall portion 22 is provided. The distal end of the support shaft 23 is located closer to the valve seat portion 12 than the rear end edge of the tapered wall portion 22. The front end side portions of the three ribs 14 are continuous with the outer peripheral surface of the tapered wall portion 22. A step portion is provided at an intermediate position in the front-rear direction X of the inner peripheral surface of the tapered wall portion 22. The step is provided with an annular rearward surface 25.

  As shown in FIGS. 2 and 3, the valve body 3 includes a valve portion 27 that contacts the valve seat (valve seat packing 18) and seals the inlet 11, and a shaft portion 28 that protrudes forward X1 from the valve portion 27. Is provided. The valve portion 27 includes a circular plate portion 29 that is smaller than the inner diameter of the inflow port 11, an annular tapered plate portion 30 that expands from the outer peripheral edge of the circular plate portion 29 toward the outer periphery toward the front X 1, and the tapered plate portion 30. The cylindrical plate part 31 of the fixed width | variety extended from the outer peripheral edge part to the front X1 is provided. The shaft portion 28 protrudes from the central portion of the circular plate portion 29 and extends in the direction of the axis L forward X1. The end plate portion 21, the tapered plate portion 30, the cylindrical plate portion 31, and the shaft portion 28 are coaxial. The shaft portion 28 includes a center hole 28a. The center hole 28a extends from the front end surface of the shaft portion 28 along the axis L to the rear X2.

  The valve body 3 is accommodated in the valve box 2 in a state where the support shaft 23 of the valve box 2 is inserted into the center hole 28 a of the shaft portion 28. The support shaft 23 supports the valve body 3 so as to be movable in the direction of the axis L. In the valve box 2, the valve body 3 moves in the direction of the axis L between a closed position 3 </ b> A that blocks the inlet 11 and an open position 3 </ b> B that is separated from the inlet 11 forward X <b> 1. 2A, the closed position 3A is a position where the circular plate portion 29 of the valve portion 27 is inserted into the inflow port 11 and the tapered plate portion 30 is in contact with the valve seat packing 18 of the valve seat portion 12. As shown in FIG. is there. In the open position 3B, as shown in FIG. 2B, the valve portion 27 is separated from the valve seat packing 18, and the front end edge of the cylindrical plate portion 31 is at the rear end edge of the tapered wall portion 22 of the bottom portion 13. It is the position where it abuts.

  Here, in a state where the valve body 3 is inserted into the valve box 2, the three ribs 14 can contact the outer peripheral surface 3 a of the valve body 3. More specifically, the three ribs 14 can come into contact with the outer peripheral surface 3 a of the cylindrical plate portion 31 of the valve portion 27. The three ribs 14 guide the valve body 3 moving between the closed position 3 </ b> A and the open position 3 </ b> B from the outer peripheral side of the valve body 3.

  The coil spring 4 is located on the outer peripheral side of the shaft portion 28 of the valve body 3. The rear end portion of the coil spring 4 contacts the valve portion 27 from the front X1. The front end portion of the coil spring 4 abuts the rearward surface 25 of the tapered wall portion 22 of the valve box 2 from the rear X2. Thereby, the coil spring 4 biases the valve body 3 to the closed position 3A. Here, since the coil spring 4 contacts the valve body 3, the valve body 3 does not rotate around the axis L while the valve body 3 moves between the closed position 3A and the open position 3B.

  The flange 5 is formed on the first end surface 8 facing the rear X 2 on the first annular recess 33, the first inner annular surface 34 positioned on the inner peripheral side of the first annular recess 33, and on the outer peripheral side of the first annular recess 33. A first outer annular surface 35 is provided concentrically. The first inner annular surface 34 and the first outer annular surface 35 are flat surfaces without irregularities, and are orthogonal to the axis L. The first O-ring 6 is attached to the first annular recess 33. Further, the flange 5 has a second end surface 9 facing the front X <b> 1, a second annular recess 36, a second inner annular surface 37 positioned on the inner peripheral side of the second annular recess 36, and an outer periphery of the second annular recess 36. A second outer annular surface 38 located on the side is provided concentrically. The second inner annular surface 37 and the second outer annular surface 38 are flat surfaces without irregularities, and are orthogonal to the axis L. The second O-ring 7 is attached to the second annular recess 36. An annular groove 39 is provided in a portion adjacent to the valve box 2 on the second end surface 9 of the flange 5 (inner peripheral side of the second inner annular surface 37).

  Here, when viewed from the direction of the axis L, the first annular recess 33 of the first end surface 8 and the second annular recess 36 of the second end surface 9 are provided at overlapping positions. In addition, when viewed from the direction of the axis L, the first inner annular surface 34 of the first end surface 8 and the second inner annular surface 37 of the second end surface 9 are provided to overlap each other, and the first outer annular surface of the first end surface 8 is provided. The surface 35 is provided at a position where the second outer annular surface 38 of the second end surface 9 overlaps.

(Check valve assembly method)
As shown in FIG. 3, the valve box 2 and the flange 5 are composed of two members, a valve box main body 41 and an inlet defining member 42. The valve box body 41 is made of POM (polyacetal resin), and the inlet regulating member 42 is made of POM (polyacetal resin) or bronze alloy. In this example, the inlet defining member 42 is made of a bronze alloy.

  The valve box body 41 includes a cylindrical plate portion 43 having a constant width, three ribs 14, and a bottom portion 13. The three ribs 14 extend from the front edge of the cylindrical plate portion 43 to the front X1. The bottom portion 13 connects the front end portions of the three ribs 14. The valve box body 41 includes an annular protrusion 44 that protrudes radially outward from the rear end of the cylindrical plate portion 43.

The inflow port defining member 42 includes an annular plate portion 46 in which the inflow port 11 is formed in the center, and a cylindrical packing support portion 47 that protrudes forward X1 from the opening edge of the inflow port 11 in the annular plate portion 46. The rear plate X of the annular plate portion 46 is the first end face 8 of the flange 5 and includes a first annular recess 33, a first inner annular surface 34, and a first outer annular surface 35 (see FIG. 2). Further, the front X1 of the annular plate portion 46 is the second end surface 9 of the flange 5, and the second annular recess 36, the second inner annular surface 37, the second outer annular surface 38, and the annular groove 39 are formed. Prepare. The packing support part 47 supports the valve seat packing 18 on the outer peripheral side thereof. In a state where the valve seat packing 18 is supported by the packing support portion 47, as shown in FIG. 2, the valve seat packing 18 protrudes forward X 1 from the front end edge of the packing support portion 47.

  When assembling the check valve 1, first, the valve body 3 and the coil spring 4 are housed inside the valve box body 41. More specifically, the coil spring 4 is arranged on the outer peripheral side of the shaft portion 28 of the valve body 3, and the support shaft 23 is inserted into the center hole 28 a of the shaft portion 28 of the valve body 3 in this state. In parallel with this, the valve seat packing 18 is supported by the packing support portion 47 of the inlet defining member 42.

  Next, the valve seat packing 18 and the packing support part 47 are inserted into the cylindrical plate part 43 from the rear X2 of the valve box body 41, and the annular protrusion of the valve box body 41 is inserted into the annular groove 39 of the annular plate part 46. 44 is inserted from the front X1. As a result, the valve seat packing 18 is fixed to the inside of the cylindrical portion 17 while being sandwiched from both sides in the radial direction by the packing support portion 47 of the inlet defining member 42 and the cylindrical plate portion 43 of the valve box body 41. Further, the annular plate portion 46 and the annular protrusion 44 of the inflow port defining member 42 constitute the flange 5 that protrudes from the valve seat portion 12 to the outer peripheral side.

  Thereafter, the first O-ring 6 and the second O-ring 7 are attached. That is, the first O-ring 6 is fixed to the first annular recess 33 and the second O-ring 7 is fixed to the second annular recess 36.

(Installation of check valve in water pipe)
As shown in FIG. 4, in the check valve 1, the flange 5 is sandwiched between the primary side pipe 61 and the secondary side pipe 62 constituting the water pipe 60, and the valve box 2 is inserted into the secondary side pipe 62. Installed in a state. In the installation posture in which the check valve 1 is installed in the water pipe 60, the axis L is coaxial with the primary side pipe 61 and the secondary side pipe 62 and extends along the flowing water direction S. Further, the bottom portion 13 of the valve box 2 is located downstream of the valve seat portion 12 in the flowing water direction S.

  When the check valve 1 is installed, the primary side pipe 61 and the secondary side pipe 62 are fastened by a cap nut 63 that is screwed onto the outer peripheral side of these connecting portions. When the cap nut 63 is tightened and the primary side pipe 61 and the secondary side pipe 62 approach each other, the first O-ring 6 is elastically deformed, and between the check valve 1 (flange 5) and the primary side pipe 61. Seal liquid-tight. Further, the second O-ring 7 is elastically deformed to seal the space between the check valve 1 (flange 5) and the secondary side pipe 62 in a liquid-tight manner.

  In a state where the first O-ring 6 is elastically deformed, the first O-ring 6 is accommodated in the first annular recess 33, and the first inner annular surface 34 and the first outer annular surface 35 of the first end surface 8 of the flange 5 are the primary side. It contacts the annular end surface 61 a on the downstream side of the pipe 61. Accordingly, the installation posture of the check valve 1 with respect to the primary side pipe 61 is defined as a predetermined posture in which the axis L is the same as the axis of the primary side pipe 61. Similarly, when the second O-ring 7 is elastically deformed, the second O-ring 7 is accommodated in the second annular recess 36, and the second inner annular surface 37 and the second outer annular surface 38 of the second end surface 9 of the flange 5 are It contacts the annular end surface 62 a on the upstream side of the secondary side pipe 62. Thereby, the installation posture of the check valve 1 with respect to the secondary side pipe 62 is defined as a predetermined posture in which the axis L is the same as the axis of the secondary side pipe 62.

Here, in the water pipe 60 buried in the ground, misalignment may occur between the primary side pipe 61 and the secondary side pipe 62 due to earth pressure or the like. That is, the axis of the primary side pipe 61 and the axis of the secondary side pipe 62 may not match. In such a case, if the check valve 1 is installed while the primary side pipe 61 and the secondary side pipe 62 are aligned, the check valve 1 is biased in a direction crossing the axial direction of the water pipe 60. The power works. Here, when the rubber packing mounted on the flange 5 covers the first end surface 8 and the second end surface 9 of the flange 5 as in the conventional case, the direction intersecting the axial direction of the water pipe 60 is biased. When the force is applied, the rubber packing may not be elastically deformed uniformly, and the axis L of the check valve 1 may face a different direction from the axis of the water pipe 60. When the axis L of the check valve 1 and the axis of the water pipe 60 are in different directions, the liquid flow becomes uneven. Compared to the case where the check valve 1 is attached in a predetermined posture. The flow rate may decrease. Further, vibration may occur in the check valve 1. When vibration is generated in the check valve 1, abnormal noise may be generated or the check valve 1 may be damaged due to the vibration.

  With respect to such a problem, in this example, the flange 5 of the check valve 1 is configured such that the first inner annular surface 34 and the first outer annular surface 35 of the first end surface 8 are annular end surfaces of the primary pipe 61. It is a contact portion that can contact the surface 61a. Therefore, even when a biased force acting in the direction intersecting the axial direction of the water pipe 60 is applied to the installed check valve 1, the check valve 1 remains in the installed posture in contact with the annular end surface 61a of the primary pipe 61. Can be maintained. Further, the flange 5 of the check valve 1 is abutted so that the second inner annular surface 37 and the second outer annular surface 38 of the second end surface 9 can come into contact with the annular end surface 62a of the secondary pipe 62. Has become a department. Therefore, even when a biased force acting in the direction intersecting the axial direction of the water pipe 60 is applied to the installed check valve 1, the installed posture remains in contact with the annular end surface 62 a of the secondary pipe 62. Can be maintained. Therefore, even when the misalignment occurs between the primary side pipe 61 and the secondary side pipe 62, the installation posture of the check valve 1 installed between them does not change.

  In this example, the flange 5 is made of metal. Therefore, even when a biased force in the direction intersecting the axial direction of the water pipe 60 acts on the installed check valve 1, it is possible to prevent the flange 5 from being deformed. Therefore, the installation posture of the check valve 1 can be reliably maintained. Therefore, the amount of water flow does not decrease due to the installation posture of the check valve 1. Further, since no vibration is generated in the check valve 1 due to the installation posture of the check valve 1, it is possible to prevent the generation of noise and damage to the check valve 1.

(Modification)
FIG. 5A is a cross-sectional view of the check valve of the first modification, and FIG. 5B is a cross-sectional view of the check valve of the second modification. The check valve 1A of Modification 1 shown in FIG. 5A is the same as the check valve 1 except for the cross-sectional shape of the first O-ring 6 and the cross-sectional shape of the second O-ring 7. . Therefore, the same reference numerals are assigned to the corresponding components, and description thereof is omitted. In the check valve 1 </ b> A of this example, a first O-ring 6 </ b> A having a rectangular cross section is attached to the first annular recess 33 of the first end surface 8 of the flange 5. A second O-ring 7 </ b> A having a rectangular cross section is attached to the second annular recess 36 of the second end surface 9 of the flange 5.

  According to this example, it is easy to ensure a close contact area where the first O-ring 6 and the primary side pipe 61 are in close contact. In addition, it is easy to ensure a close contact area where the second O-ring 7 and the secondary side pipe 62 are in close contact. Therefore, a liquid-tight state can be reliably established between the check valve 1A and the primary side pipe 61 and between the check valve 1A and the secondary side pipe 62.

  In the check valve 1B of Modification 2 shown in FIG. 5B, the first end surface 8 'of the flange 5 is a flat surface. That is, the first annular recess 33 is not provided on the first end face 8 ′. An annular rubber 51 having a constant thickness is fixed to the first end face 8 'by baking. The other configuration of the check valve 1B of the second modification is the same as that of the check valve 1 described above. Therefore, the same reference numerals are assigned to the corresponding components, and description thereof is omitted.

In this example, when the check valve 1B is arranged in the water pipe 60, the second O-ring 7 is elastically deformed so that the second inner annular surface 37 and the second outer annular surface 38 of the second end surface 9 of the flange 5 are formed. It contacts the annular end surface 62 a on the upstream side of the secondary side pipe 62. Therefore, even when a biased force acting in the direction intersecting the axial direction of the water pipe 60 is applied to the installed check valve 1, the installed posture remains in contact with the annular end surface 62 a of the secondary pipe 62. Can be maintained. Further, the rubber 51 is elastically deformed between the flange 5 and the annular end surface 61a on the downstream side of the primary side pipe 61, thereby sealing the space between them.

  Instead of baking the annular rubber 51 with the first end surface 8 side of the flange 5 as a flat surface, the annular rubber 51 may be baked and fixed with the second end surface 9 as a flat surface. In this case, when the check valve 1B is arranged in the water pipe 60, the first O-ring 6 is elastically deformed, and the first inner annular surface 34 and the first outer annular surface 35 of the first end surface 8 of the flange 5 are obtained. Comes into contact with the annular end surface 61 a on the downstream side of the primary pipe 61. Therefore, even when a biased force acting in the direction intersecting the axial direction of the water pipe 60 is applied to the installed check valve 1, the check valve 1 remains in the installed posture in contact with the annular end surface 61a of the primary pipe 61. Can be maintained.

1 · 1A · 1B ··· Check valve 2 ··· Valve box 3 ··· Valve body 5 ··· Flange 6 ··· 1st O-ring (first elastic member)
7 ... 2nd O-ring (2nd elastic member)
8 ... 1st end surface 9 ... 2nd end surface 11 ... Inflow port (liquid inflow port)
15 ... Outlet (liquid outlet)
33 ... 1st annular recessed part 34 ... 1st inner side annular surface (1st contact part)
35 ... 1st outer side annular surface (1st contact part)
36: second annular recess 37: second inner annular surface (second contact portion)
38 ... 2nd outer side annular surface (2nd contact part)
60 ... Water pipe (liquid distribution pipe)
61 ... Primary side piping 62 ... Secondary side piping

Claims (7)

A valve box having a liquid inlet and a liquid outlet, a valve body that is accommodated in the valve box and opens and closes the liquid inlet, and an annular flange that protrudes outward from the valve box, In the check valve installed in a state where the flange is inserted between the primary side pipe and the secondary side pipe constituting the liquid flow pipe and the valve box is inserted into the liquid flow pipe,
An annular first elastic member that elastically deforms between the flange and the primary pipe and seals the flange and the primary pipe in a liquid-tight manner;
A first end face of the flange facing the primary pipe is in contact with the primary pipe when the first elastic member is elastically deformed between the primary pipe and the flange. A check valve comprising a possible first contact portion. In claim 1,
An annular second elastic member that elastically deforms between the flange and the secondary pipe and seals the flange and the secondary pipe in a liquid-tight manner;
The second end face of the flange facing the secondary pipe is in contact with the secondary pipe when the second elastic member is elastically deformed between the secondary pipe and the flange. A check valve comprising a second abutable portion. In claim 2,
The first end surface includes a first annular recess surrounding the valve box, a first inner annular surface located on the inner peripheral side of the first annular recess, and a first outer side located on the outer peripheral side of the first annular recess. With an annular surface,
The first elastic member is attached to the first annular recess,
The check valve according to claim 1, wherein the first inner annular surface and the first outer annular surface are the first contact portions. In claim 3,
The second end surface includes a second annular recess surrounding the valve box, a second inner annular surface positioned on the inner peripheral side of the second annular recess, and a second outer side positioned on the outer peripheral side of the second annular recess. With an annular surface,
The second elastic member is attached to the second annular recess,
The check valve according to claim 1, wherein the second inner annular surface and the second outer annular surface are the second contact portions. In claim 2,
The check valve according to claim 1, wherein each of the first elastic member and the second elastic member is an O-ring. In claim 5,
The check valve is characterized in that the O-ring has a rectangular cross section. In any one of claims 1 to 6,
The check valve according to claim 1, wherein the flange is made of metal.

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