JP2016008690A - Attachment structure of check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure of a check valve easily attached to a pipeline, and saving labor of manufacturing.SOLUTION: In a check valve, a valve casing 1 having a flange part 3 is attached so as to be held through an annular seal body 36 provided between a pair of flanges 33, 34 connected to each other, on an upstream side in a fluid circulation direction. In the valve casing 1, a valve body 15 is energized in a seating direction to a valve seat 4, through a shaft 10 and energization means 12. Also, a flexible pipe body 30 fitted to the outside of the check valve is formed by a fluorine resin.

Description

  The present invention relates to a check valve mounting structure that can prevent water hammer and mechanical vibration.

The check valve is disposed, for example, on the downstream side of the pump, and is opened by the pump pressure to flow the fluid downstream. When the pump is stopped, the flow path is closed by the urging force of a spring provided on the valve.
As an example, the check valve of Patent Document 1 has been proposed.
Such a check valve includes a shaft support member that serves as a valve body and a valve seat, and a valve box that fits the shaft support member, and has a structure that prevents water hammer by a quick spring movement. That is, the built-in spring closes the flow path quickly by pushing down the valve body perpendicularly to the flow path.

JP 2005-36889 A

This check valve structure has a valve box made of a cast product formed in a cylindrical shape, and a valve body and a shaft support member arranged inside thereof, and prevents water hammer when the valve is closed as much as possible. To do. However, a cylindrical valve box made of a cast article is heavy and structurally expensive.
The shaft support member of the valve body is screwed and fastened to both openings of the valve box. For this reason, the number of manufacturing processes such as grooving of the threaded portion is increased, the number of parts is increased, and there is a disadvantage that the cost is excessive.
Furthermore, when attaching a valve body and a shaft support member to the valve box, they must be screwed and fastened, which is cumbersome.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a check valve mounting structure that eliminates these drawbacks, has a low manufacturing cost, is simple in structure, and is easy to mount.

In the first aspect of the present invention, a flange portion (3) is provided on the outer periphery of one end of the cylindrical portion (2), and a valve seat (4) is provided on the other end opening of the cylindrical portion (2). Valve casing (1),
It has an insertion part (6) of the shaft (10) in the center, and has a connection part (7) radially outward from the insertion part (6), and the end of the connection part (7) is the valve casing. A shaft support (5) connected to the inner circumference of (1);
A shaft (10) having one end inserted and fixed to the insertion portion (6) of the shaft support portion (5) and the other end protruding,
A valve body (15) whose shaft (10) is liquid-tightly inserted into the central hole and detachably seated on the valve seat (4),
An urging means (12) for urging the valve body (15) in the seating direction, and a check valve comprising:
Inside the flexible tube body (30) having metal flanges (33) (33) at both ends, the check valve is disposed,
The flexible tube body (30) is formed of a fluororesin,
There are small flanges (31) at both ends in the axial direction, and the metal flange (33) is arranged on the outer periphery of the small flange (31),
The flange (3) of the valve casing (1) is brought into contact with the small flange (31), and the flange (3) is opposed to the metal flange (33). ), And a check valve mounting structure that is mounted so as to be clamped via a seal body (36).

The invention according to claim 2 is provided with a flange part (3) on the outer periphery of one end of the cylindrical part (2) and a valve seat (4) at the other end opening of the cylindrical part (2). A valve casing (1);
It has an insertion part (6) of the shaft (10) in the center, and has a connection part (7) radially outward from the insertion part (6), and the end of the connection part (7) is the valve casing. A shaft support (5) connected to the inner circumference of (1);
A shaft (10) having one end inserted and fixed to the insertion portion (6) of the shaft support portion (5) and the other end protruding,
A valve body (15) whose shaft (10) is liquid-tightly inserted into the central hole and detachably seated on the valve seat (4),
An urging means (12) for urging the valve body (15) in the seating direction, and a check valve comprising:
Inside the flexible tube body (30) having metal flanges (33) (33) at both ends, the check valve is disposed,
The flexible tube body (30) is made of stainless steel, has annular groove rings (32) at both ends in the axial direction, and a metal flange (33) is arranged on the outer periphery of the groove ring (32). And
The flange (3) of the valve casing (1) abuts the grooved ring (32) via an annular seal body (37), and the flange (3) is connected to a metal flange (33). This is a check valve mounting structure that is mounted so as to be sandwiched between a flange (34) of an opposing pipe (35) via a seal body (36).

The invention according to claim 3 is the check valve mounting structure according to claim 1 or 2,
The valve body (15) has a valve body (15a) and a sandwiching body (15c),
The valve body (15a) is formed with a cylindrical portion (15b) having the central hole, and the sandwiching body (15c) is formed with a cylindrical portion (15d) having the central hole,
An inner screw (16) is formed on the cylindrical portion (15b) of the valve body (15a), and an outer screw (19) is formed on the cylindrical portion (15d) of the clamping body (15c),
Installation of a check valve that constitutes the valve body (15) by screwing them together with the valve seat abutting member (18) interposed between the valve body (15a) and the clamping body (15c) It is a structure.

According to a fourth aspect of the present invention, in the check valve mounting structure according to the first or second aspect,
The valve body (15) has a valve body (15a) and a sandwiching body (15c),
The valve body (15a) is integrally formed with a cylindrical portion having the center hole,
The valve seat abutting member (18) is disposed on the valve body (15a), the valve seat abutting member (18) is pressed by the clamping body (15c), and the locking ring is adjacent to the clamping body (15c). This is a check valve mounting structure provided with (15e) and fixed by a locking ring (15e) to constitute the valve body (15).

The invention according to claim 5 is the check valve mounting structure according to any one of claims 1 to 4,
The outer diameter of the cylindrical portion (2) of the valve casing (1) is smaller than the inner diameter of the end of the flexible tube body (30), and the valve casing (1) is formed of the flange. (33) When sandwiched between (34), an annular passage (42) is formed between the tubular portion (2) and the flexible tube body (30),
A check valve having a bypass passage (9) communicating the passage (42) and the inner periphery of the cylindrical portion (2), the bypass passage (9) being provided to be openable and closable. This is the mounting structure.

The invention according to claim 6 provides the check valve mounting structure according to claim 5,
A bypass plug (41) screwed into a plug insertion hole (8) having an inlet / outlet (9a) that penetrates the flange portion (3) in the radial direction and opens into the cylindrical portion (2). In addition, an inlet / outlet (9b) communicating with the passage (42) is provided at the root of the plug insertion hole (8) and the cylindrical portion (2) so that the inlets / outlets (9a) and (9b) communicate with each other. The check valve mounting structure is characterized in that the bypass passage (9) is formed in an L shape.

In the first aspect of the invention, the flange 3 of the outer flange shape of the valve casing 1 has an annular seal body 36 between the flange 33 of the flexible pipe main body 30 made of fluororesin and the flange 34 of the pipe 35. It is attached so that it may be pinched | interposed through.
Therefore, the valve casing 1 can be disposed in the flexible tube main body 30 very easily and can be easily attached and detached.
Further, since the flexible tube main body 30 is molded from a fluororesin, its manufacture is easy, the corrosion resistance is excellent, and the check valve mounting structure is good in terms of maintenance and cost.

In the above configuration, the flange portion 3 of the outer flange shape of the valve casing 1 is sandwiched between the flange 33 of the stainless steel flexible tube body 30 and the flange 34 of the pipe 35 via the annular seal bodies 36 and 37. It is attached as is done.
Therefore, the valve casing 1 can be disposed in the flexible tube main body 30 very easily and can be easily attached and detached.
Further, since the flexible tube main body 30 is made of stainless steel, the check valve mounting structure has a long life and good maintainability.

In any of the above configurations, when the valve body 15 is formed by screwing and fastening the divided body, the valve seat contact member 18 is prevented from being detached from the valve body 15 due to water pressure, and the check When the valve is disassembled, it can be prevented from being lost. Further, the valve seat 15 can be mounted on the valve body 15 without applying an excessive force to the valve seat contact member 18.
In addition to the method of screwing and fastening the valve body 15, a method of pressing the clamping body 15c and the valve seat abutting member 18 against the valve main body 15a by a locking ring 15e can be employed.

In any one of the configurations described above, an annular passage 42 is formed between the outer periphery of the tubular portion 2 of the valve casing 1 and the inner periphery of the end portion of the flexible tube body 30, and the passage 42 and the tubular portion 2 A bypass path 9 that communicates with the inner periphery is provided, and the bypass path 9 is formed to be openable and closable.
In this way, the bypass passage 9 and the passage 42 can be formed by processing the valve casing 1, so that it is not necessary to change the design of the flexible tube main body 30.

In the above-described configuration, the bypass plug 41 is screwed into a plug insertion hole (8) having an inlet / outlet 9a that passes through the flange portion 3 in the radial direction and opens into the cylindrical portion 2, and the plug insertion hole ( An entrance / exit 9b communicating with the passage 42 is provided at the root of 8), and the bypass passage 9 is formed in an L shape so as to communicate the entrances / exits 9a, 9b.
According to this structure, the flow path of the bypass path 9 formed in the flange portion 3 of the valve casing 1 is shortened. Therefore, it is difficult to cause clogging in the bypass passage 9, and it is possible to provide a device that does not require maintenance.

The exploded sectional view showing the 1st example of the check valve used for the present invention. It is a longitudinal cross-sectional view which shows the state by which the non-return valve used for this invention was inserted in the flexible tube main body 30, Comprising: II-II arrow sectional drawing of FIG. III-III arrow line view of FIG. The principal part longitudinal cross-sectional view explaining the bypass structure of this invention. The longitudinal cross-sectional view explaining the effect | action of this invention. The longitudinal cross-sectional view which shows 2nd Example of the non-return valve used for this invention. The longitudinal cross-sectional view which shows the other example of the non-return valve used for this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded cross-sectional view of the check valve of the present invention, and FIG. 2 is a vertical cross-sectional view after the check valve is attached to a pipe.

(Structure of valve casing 1)
This check valve has a valve casing 1 and a shaft 10 in which a shaft support portion 5 is integrally provided, and a valve body 15 is attached to the valve casing 1 via a biasing means 12. The present invention is particularly characterized by the structure of the valve casing 1 of the check valve.
In this embodiment, as shown in FIG. 1, the valve casing 1 is integrally provided with an outer flange-shaped flange portion 3 on the outer periphery of one end of a cylindrical portion 2 having a circular cross section. A valve seat 4 is provided on the end face of the other end opening of the cylindrical portion 2. Further, a shaft support portion 5 is integrally formed on the inner periphery of the cylindrical portion 2.
As shown in FIG. 2, the outer diameter of the cylindrical portion 2 is formed smaller than the inner diameter of the end portion of the flexible tube main body 30 to which the check valve is fitted, and the cylindrical portion 2 and the flexible tube main body are formed. A slight gap is formed between 30 and the passage 42.

  The shaft support portion 5 has an insertion portion 6 of the shaft 10 at the center, and the insertion portion 6 and the inner periphery of the tubular portion 2 of the valve casing 1 have two connecting portions 7 as shown in FIG. Are connected together. The connecting portion 7 is provided 180 degrees apart in the circumferential direction on the outer side in the radial direction from the insertion portion 6. However, the number of the connection parts 7 is not restricted to this.

(Structure of bypass 9)
Next, the bypass path 9 provided integrally with the valve casing 1 will be described.
The collar part 3 is formed with a large thickness, and the flat part of the collar part 3 is formed flat. The flange portion 3 is formed with a plug insertion hole 8 penetrating in the radial direction from the outer periphery thereof, and the tip thereof opens to the inner periphery of the cylindrical portion 2 to form one entrance / exit 9a.
Further, the other inlet / outlet 9b opens at the root of the plug insertion hole 8 and the cylindrical portion 2. And the entrances and exits 9a and 9b communicate with each other in an L shape to form a bypass path 9 (see FIGS. 1 and 4).

Further, the plug insertion hole 8 is provided with a bypass plug locking portion 40 in which an internal screw is threaded. The bypass plug 41 is screwed to it. The bypass plug 41 is formed with an external screw at an axial intermediate portion thereof. By opening the bypass plug 41 in the axial direction, the bypass path 9 is opened and closed. In this example, only one bypass passage 9 and one bypass plug 41 are provided, but a plurality of bypass passages 9 and a plurality of bypass stoppers 41 may be provided apart from each other in the circumferential direction.
In addition, although the cylindrical part 2 and the collar part 3 of the valve casing 1 are desirably manufactured integrally, they are manufactured separately, and the valve casing 1 is formed by joining them by welding or the like during assembly. It is also possible.

(Valve, urging means, shaft structure)
In this embodiment, a coil spring (hereinafter referred to as a spring 12) is used as the biasing means 12 of the valve body 15.
The valve body 15 includes a valve main body 15a, a sandwiching body 15c, and a valve seat contact member 18.
As shown in FIG. 1, the valve main body 15a has a cylindrical portion 15b formed in a cylindrical shape, and a central hole through which the shaft 10 is inserted penetrates the inner periphery thereof. Is formed. The outer periphery of the lower part is formed in a disk shape, and an annular groove 17 is formed on the lower surface side thereof, on which an annular rubber valve seat abutting member 18 is seated. As an example, the valve seat contact member 18 can be used by giving rubber elasticity to a fluororesin such as PTFE (polytetrafluoroethylene).
The outer diameter of the upper portion of the cylindrical portion 15b matches the inner diameter of the spring 12.
The inner diameter of the valve seat abutting member 18 is aligned with the outer periphery of the lower portion of the cylindrical portion 15 b, and the outer diameter thereof is substantially aligned with the outer diameter of the valve seat 4 of the valve casing 1.

The sandwiching body 15c has a cylindrical portion 15d formed in a cylindrical shape, an outer flange is formed at one end thereof, and the diameter thereof is smaller than the outer diameter of the valve seat contact member 18. An outer screw 19 is formed on the outer periphery of the cylindrical portion 15d. Further, a hole having the same diameter as the central hole of the valve body 15a is penetrated through the inner periphery thereof. Further, an annular step portion 20 in which a sealing O-ring 21 is disposed is formed on the inner periphery of the other end portion of the sandwiching body 15c.
With the valve seat abutting member 18 disposed on the valve body 15a, the clamping body 15c is screwed and fastened to constitute the valve body 15. The inner diameter of the central hole through which the shaft 10 provided in the valve body 15 is inserted matches the inner diameter of the insertion portion 6 of the valve casing 1 and the axes thereof coincide.
The valve body 15 is formed so as to be slidable in the axial direction of the shaft 10.

The shaft 10 is formed with a shaft portion 10a formed in the shape of an elongated round bar, and a step portion 10b that matches the inner diameter of the spring 12 at one end portion in the longitudinal direction, and radially outward at the tip portion. A bulging seat portion 10c is formed. A tool fitting portion 10d is provided on the top of the seat portion 10c. A screw portion 10e is formed on the outer periphery of the shaft portion 10a at the other end.
The outer diameter of the shaft portion 10 a of the shaft 10 matches the inner diameter of the central hole of the shaft 10 of the valve body 15 and the inner diameter of the insertion portion 6 of the valve casing 1. The valve body 15 comes into liquid-tight contact with the shaft 10 through the O-ring 21.

(Structure of flexible tube body 30)
Next, the structure of the flexible tube body 30 that is fitted with a check valve and serves as a valve box will be described.
The flexible tube body 30 of this embodiment is formed by injection molding of a fluororesin. The fluororesin flexible tube body 30a can be manufactured using, for example, PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), or the like.
The flexible tube body 30a made of fluororesin is formed in a cylindrical shape, and its axial middle portion is formed in a drum shape that bulges outward, and small flanges 31 are integrally formed at both ends in the axial direction. Has been. The shape of the intermediate portion is not limited to the drum shape, but can be changed to a bellows shape, a saddle shape, or the like.
As shown in FIG. 2, metal flanges 33 connected to the pipes are fitted on the outer circumferences of the pair of small flanges 31, respectively. As shown in FIG. 3, the flange 33 has a large number of bolt holes formed at equal intervals on the outer side in the radial direction.

(Check valve assembly procedure)
A procedure for assembling the check valve will be described.
First, in a state where the valve seat contact member 18 is disposed in the annular groove 17 of the valve main body 15a, the clamping body 15c is screwed and fastened to constitute the valve body 15. At that time, an O-ring 21 is attached in advance to the step portion 20 of the sandwiching body 15c.
Next, the spring 12 is inserted from the tip of the threaded portion 10e of the shaft 10, and then the valve body 15a of the valve body 15 is inserted so as to face upward in FIG.
And the front-end | tip of the thread part 10e of the shaft 10 is inserted in the insertion part 6 of the valve casing 1, and the valve casing 1 and the valve body 15 are fixed with the nut 11. FIG. The valve body 15 is urged by a spring 12 in a direction in which the valve body 15 contacts the valve seat 4.
Further, a bypass plug locking portion 40 is attached to the plug insertion hole 8 provided in the flange portion 3 of the valve casing 1 by welding. The bypass stopper locking portion 40 has a hole that matches the diameter of the stopper insertion hole 8, and the inner periphery thereof is threaded. A bypass plug 41 is screwed there.

(How to attach the check valve to the flexible tube body 30)
As shown in FIG. 2, the check valve of the present invention is attached to the upstream side in the water flow direction of a flexible tube main body 30a made of fluororesin (hereinafter referred to as the flexible tube main body 30a).
First, the flange 3 of the assembled valve casing 1 of the check valve is brought into contact with the small flange 31 of the flexible tube main body 30a. Next, the flange 3 is sandwiched between the flange 33 of the flexible tube main body 30a and the flange 34 of the pipe 35 opposed thereto via an annular seal body 36.
In such an attachment structure, the check valve can be attached only by clamping the flange 3 without processing the flange 33 of the flexible tube main body 30a as in the prior art. Therefore, there is an effect that the time for the check valve mounting work and the removal work at the time of maintenance is greatly shortened. In addition, since the fluororesin itself has a sealing property, it is not necessary to interpose a sealing body in a portion adjacent to the small flange 31 of the flexible tube main body 30a.

(About bypass 9)
The outer diameter of the cylindrical portion 2 of the valve casing 1 is formed smaller than the inner diameter of the end portion of the flexible tube main body 30a that serves as a valve box of the check valve. Therefore, when the cylindrical portion 2 of the check valve is inserted into one end portion of the flexible tube main body 30a, an annular gap is generated between the outer periphery of the cylindrical portion 2 and the inner periphery of the flexible tube main body 30a. A passage 42 is formed there. The passage 42 and the bypass passage 9 of the collar portion 3 communicate with each other with the bypass plug 41 open (FIG. 4). Normally, as shown in FIG. 2, the bypass plug 41 is in a closed state.
In this way, by forming the bypass passage 9 integrally with the valve casing 1 of the check valve, the bypass passage 9 can be easily provided for the flexible tube which is difficult to secure the bypass passage due to its structure. .
Then, water is bypassed between the inside of the flexible tube main body 30a and the upstream opening end thereof via the bypass passage 9 and the passage 42. When priming water before driving the pump or draining water from the flexible tube body 30a, as shown in FIG. 4, the bypass plug 41 is opened to bypass the water.

(Operation of check valve mounted using the present invention)
FIG. 5 illustrates the operation of the valve body 15.
A pump (not shown) is connected to the upstream area or downstream side of the pipe 35.
The valve body 15 is moved to the downstream side in the axial direction against the spring 12 by the liquid pressure from there, and the gap between the opening of the valve seat 4 and the valve body 15 is opened. In this example, the fluid 43 flows from the bottom to the top as shown by the arrows in FIG.
Next, when the pump stops, the liquid pressure on the pump side decreases, the spring 12 extends, and the valve body 15 is closed. At this time, the flexible tube main body 30a extends and absorbs the water hammer.
Furthermore, the pulsating flow when the pump is operated, various mechanical vibrations and the like are reliably absorbed by the flexible tube main body 30a, and the pressure resistance of the piping is improved. Further, the flexible tube main body 30a expands and contracts and deforms in the radial direction due to an earthquake or the like, and effectively absorbs the external force.

(Second embodiment of a check valve used in the mounting structure of the present invention)
FIG. 6 shows a second embodiment of the check valve used in the present invention. This example is different from the check valve of the first embodiment in that a flexible tube body 30 serving as a valve box is made of a stainless steel tube. It was formed by. Other structures and operational effects are the same as those of the first embodiment.
The portions excluding both ends of the stainless steel tube are formed in a bellows shape to constitute a flexible tube main body 30b made of stainless steel. Both ends are connected to a pair of annular groove rings 32 by welding or the like. Each of the groove-like rings 32 is fitted with a flange 33 connected to the pipe 35. On the inner periphery of the flange 33, a recess that matches the outer periphery of the grooved ring 32 is provided.
In this embodiment, the flexible tube main body 30b, the groove ring 32, and the flange 33 are made of stainless steel.

(Other examples of valve body and shaft used in the present application)
The structures of the valve body 15 and the shaft 10 used in the present application are not limited to those of the above embodiments.
For example, as shown in FIG. 7, the cylindrical portion is provided only on the valve body 15a, and the valve seat abutting member 18 is disposed on the valve body 15a, and is held from below in the drawing by the clamping body 15c, You can fix them by 15e. In this structure, the cylindrical portion of the valve body 15 is not divided and the center hole has no seam, so that the sliding contact between the valve body 15 and the shaft 10 becomes smooth. Further, since the structure of the valve body 15 becomes simple, its manufacture becomes easy.
In this example, the O-ring 21 can also be arranged by providing the groove 22 on the outer periphery of the shaft portion 10a of the shaft 10. In this case, as shown in FIG. 7, the position where the groove 22 is provided in the shaft 10 is such that the O-ring 21 is not detached even when the valve body 15 slides up and down the shaft 10 shaft. An O-ring 21 is disposed on the shaft portion 10a on the inner periphery of the portion.

DESCRIPTION OF SYMBOLS 1 Valve casing 2 Cylindrical part 3 collar part 4 Valve seat 5 Shaft support part 6 Insertion part 7 Connection part 8 Plug insertion hole 9 Bypass path
9a doorway
9b doorway

10 shaft
10a Shaft
10b Step
10c seat
10d Tool insertion part
10e Screw part
11 Nut
12 Energizing means

15 Disc
15a Valve body
15b Tube
15c sandwich
15d tube
15e Locking ring
16 Internal thread
17 Annular groove
18 Valve seat contact material
19 External thread
20 steps
21 O-ring
22 groove

30 Flexible tube body
30a Flexible tube body made of fluororesin
30b Flexible tube body made of stainless steel
31 Small flange
32 Grooved ring
33 Flange
34 Flange
35 Piping
36 Seal body
37 Seal body

40 Bypass stopper
41 Bypass plug
42 Passage
43 Fluid

Claims (6)

A valve casing (1) provided with a flange (3) on the outer periphery of one end of the cylindrical part (2), and provided with a valve seat (4) at the other end opening of the cylindrical part (2);
It has an insertion part (6) of the shaft (10) in the center, and has a connection part (7) radially outward from the insertion part (6), and the end of the connection part (7) is the valve casing. A shaft support (5) connected to the inner circumference of (1);
A shaft (10) having one end inserted and fixed to the insertion portion (6) of the shaft support portion (5) and the other end protruding,
A valve body (15) whose shaft (10) is liquid-tightly inserted into the central hole and detachably seated on the valve seat (4),
An urging means (12) for urging the valve body (15) in the seating direction, and a check valve comprising:
Inside the flexible tube body (30) having metal flanges (33) (33) at both ends, the check valve is disposed,
The flexible tube body (30) is formed of a fluororesin,
There are small flanges (31) at both ends in the axial direction, and the metal flange (33) is arranged on the outer periphery of the small flange (31),
The flange (3) of the valve casing (1) is brought into contact with the small flange (31), and the flange (3) is opposed to the metal flange (33). ), And a check valve mounting structure that is mounted so as to be clamped via a seal body (36). A valve casing (1) provided with a flange (3) on the outer periphery of one end of the cylindrical part (2), and provided with a valve seat (4) at the other end opening of the cylindrical part (2);
It has an insertion part (6) of the shaft (10) in the center, and has a connection part (7) radially outward from the insertion part (6), and the end of the connection part (7) is the valve casing. A shaft support (5) connected to the inner circumference of (1);
A shaft (10) having one end inserted and fixed to the insertion portion (6) of the shaft support portion (5) and the other end protruding,
A valve body (15) whose shaft (10) is liquid-tightly inserted into the central hole and detachably seated on the valve seat (4),
An urging means (12) for urging the valve body (15) in the seating direction, and a check valve comprising:
Inside the flexible tube body (30) having metal flanges (33) (33) at both ends, the check valve is disposed,
The flexible tube body (30) is made of stainless steel, has annular groove rings (32) at both ends in the axial direction, and a metal flange (33) is arranged on the outer periphery of the groove ring (32). And
The flange (3) of the valve casing (1) abuts the grooved ring (32) via an annular seal body (37), and the flange (3) is connected to a metal flange (33). A check valve mounting structure that is mounted so as to be sandwiched between a flange (34) of an opposing pipe (35) via a seal body (36). In the check valve mounting structure according to claim 1 or 2,
The valve body (15) has a valve body (15a) and a sandwiching body (15c),
The valve body (15a) is formed with a cylindrical portion (15b) having the central hole, and the sandwiching body (15c) is formed with a cylindrical portion (15d) having the central hole,
An inner screw (16) is formed on the cylindrical portion (15b) of the valve body (15a), and an outer screw (19) is formed on the cylindrical portion (15d) of the clamping body (15c),
Installation of a check valve that constitutes the valve body (15) by screwing them together with the valve seat abutting member (18) interposed between the valve body (15a) and the clamping body (15c) Construction. In the check valve mounting structure according to claim 1 or 2,
The valve body (15) has a valve body (15a) and a sandwiching body (15c),
The valve body (15a) is integrally formed with a cylindrical portion having the center hole,
The valve seat abutting member (18) is disposed on the valve body (15a), the valve seat abutting member (18) is pressed by the clamping body (15c), and the locking ring is adjacent to the clamping body (15c). A check valve mounting structure provided with (15e) and fixed by a locking ring (15e) to constitute the valve body (15). In the check valve mounting structure according to any one of claims 1 to 4,
The outer diameter of the cylindrical portion (2) of the valve casing (1) is smaller than the inner diameter of the end of the flexible tube body (30), and the valve casing (1) is formed of the flange. (33) When sandwiched between (34), an annular passage (42) is formed between the tubular portion (2) and the flexible tube body (30),
A check valve having a bypass passage (9) communicating the passage (42) and the inner periphery of the cylindrical portion (2), the bypass passage (9) being provided to be openable and closable. Mounting structure. In the check valve mounting structure according to claim 5,
A bypass plug (41) screwed into a plug insertion hole (8) having an inlet / outlet (9a) that penetrates the flange portion (3) in the radial direction and opens into the cylindrical portion (2). In addition, an inlet / outlet (9b) communicating with the passage (42) is provided at the root of the plug insertion hole (8) and the cylindrical portion (2) so that the inlets / outlets (9a) and (9b) communicate with each other. A check valve mounting structure, wherein the bypass passage (9) is formed in an L shape.

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