Adapter and flow control valve mounting structure using same

Abstract

The invention provides an adapter and a flow control valve mounting structure, which can easily mount a flow control valve in a mounting hole of a plate. An adapter mounts a flow control valve in a hole of a plate, the flow control valve having a first body and a second body, the second body being provided protruding from an intermediate portion of the first body, and having a dial portion at a tip portion. The adapter is provided with a ring part, a first holding leg part, a second holding leg part and a locking arm, and the ring part is used for enabling the lower surface to abut against the periphery of a mounting hole in the surface of the plate and enabling the dial part to penetrate towards the surface side through the mounting hole. A first holding leg part and a second holding leg part for hanging from the lower surfaces of both radial end parts of the ring part and clamping the flow control valve from both sides; the lock arm connects the first holding leg and the second holding leg to each other. The base end portion of the lock arm is rotatably connected to the lower end portion of the first holding leg portion, and the front end portion of the lock arm has an engaged portion capable of engaging and disengaging with an engaging portion provided at the lower end portion of the second holding leg portion.

Description

Technical Field

[0001] The present invention relates to an adapter for mounting a flow control valve having a flow adjustment portion at the front end of a second body protruding from the middle portion of a first body on a plate, and a mounting structure of the flow control valve using the adapter. Background Art

[0002] Flow control valves with a flow adjustment section at the front end of a second body protruding from the middle of a first body have been known in various configurations. Such conventional flow control valves, such as those described in Patent Documents 1 and 2, include a first cylindrical portion (first body); a second cylindrical portion extending downward from the middle of the first cylindrical portion; a third cylindrical portion (second body) protruding upward from the upper end of the second cylindrical portion; and a flow adjustment handle (flow adjustment section) disposed at the front end of the third cylindrical portion.

[0003] However, such flow control valves can be mounted on a plate, for example, using nuts. However, tightening the nuts requires tools, making tool preparation and tightening operations often complicated. Therefore, a method for easily mounting a flow control valve on a plate is desired.

[0004] Prior art literature

[0005] Patent Literature

[0006] [Patent Document 1] Japanese Patent Application No. 2011-024275

[0007] [Patent Document 2] Japanese Design Registration No. 1520214 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] Therefore, the technical problem of the present invention is to provide an adapter and an installation structure of a flow control valve using the adapter, which can easily perform its installation operation when the flow control valve is installed on a plate, and the flow control valve has a flow adjustment part at the front end portion of the second body protruding from the middle portion of the first body.

[0010] Means to solve the problem

[0011] In order to solve the above problems, the adapter of the present invention is used to install a flow control valve having a first body and a second body through the mounting hole of the plate, the first body being provided with input and output ports at both ends; the second body being protruded upward from the middle portion in the longitudinal direction of the above-mentioned first body, and having a flow adjustment portion at the upper end, the adapter is characterized in that the above-mentioned adapter has a ring portion, a first retaining leg portion, a second retaining leg portion and a locking arm, the ring portion being used to make the lower surface abut against the periphery of the above-mentioned mounting hole in the surface of the above-mentioned plate, so that the above-mentioned flow adjustment portion is directed to the above-mentioned surface through the above-mentioned mounting hole. side penetration; the first holding leg and the second holding leg are used to hang down from the above-mentioned lower sides of the two end portions in the radial direction of the above-mentioned ring portion, and clamp the above-mentioned second body of the above-mentioned flow control valve from both sides while protruding to the back side of the above-mentioned plate through the above-mentioned mounting hole; the locking arm connects the above-mentioned first holding leg and the second holding leg to each other, the base end of the above-mentioned locking arm is rotatably connected to the front end portion of the above-mentioned first holding leg, and the front end portion of the above-mentioned locking arm has a clamping portion, which can be engaged and disengaged with respect to the clamping portion provided at the front end portion of the above-mentioned second holding leg.

[0012] In this case, it is preferable that the ring portion is provided with a pair of fitting protrusions protruding from the lower surface at both ends in the radial direction, and the fitting protrusions have side surfaces for abutting against the inner surface of the mounting hole.

[0013] Furthermore, it is preferable that a protrusion for engaging with an engagement groove provided on the inner surface of the mounting hole of the plate is provided on one of the side surfaces of the pair of fitting protrusions.

[0014] Furthermore, it is preferable that the fitting protrusion has a front end surface at a front end portion thereof, and the front end surface of the fitting protrusion can cause the flow control valve to abut against it to perform upward positioning of the flow control valve.

[0015] In addition, preferably, a pair of spring locking pieces are provided on the ring portion and hang down from the lower side of the two radial ends thereof, and each of the pair of spring locking pieces is inclined radially outward toward the front end side and can be elastically deformed radially inward.

[0016] In addition, preferably, the spring locking piece is provided with a stepped portion for contacting the back surface of the plate toward its base end, the stepped portion forming a plurality of steps in a stepped manner on an outer surface facing the radially outward side of the spring locking piece. In addition, preferably, the pair of spring locking pieces are arranged radially outward of each of the first retaining leg and the second retaining leg, and downwardly extending guide plates are connected to the respective front ends of the pair of spring locking pieces. These guide plates are inclined radially inward downward from the respective front ends of the pair of spring locking pieces, and the lower ends of these guide plates are connected to the retaining legs adjacent to these guide plates.

[0017] In addition, preferably, the above-mentioned locking arm has an arm main body, an arm bending part and the above-mentioned engaged part, the arm main body is connected to the front end part of the above-mentioned first holding leg; the arm bending part protrudes from the front end part of the above-mentioned arm main body; the above-mentioned engaged part is arranged at the front end part of the above-mentioned arm bending part, and the above-mentioned engaged part has a protrusion protruding from the front end part of the above-mentioned arm bending part, and the above-mentioned engaging part of the above-mentioned second holding leg has a recess, which is formed on the outside of the above-mentioned second holding leg and can engage the above-mentioned protrusion, and an inclined guide surface is provided on the outside of the above-mentioned second holding leg on the front end side compared with the above-mentioned recess, and the inclined guide surface is inclined radially outward toward the side of the above-mentioned recess to guide the movement of the above-mentioned protrusion.

[0018] In addition, preferably, a stop portion protruding radially inward is provided on the respective inner surfaces of the first retaining leg and the second retaining leg, and the stop portion has a contact surface for supporting the flow control valve clamped between the first retaining leg and the second retaining leg from below.

[0019] In addition, regarding the installation structure of the flow control valve of the present invention, the above-mentioned flow control valve with a flow adjustment part is installed in the installation hole of the plate through an adapter, and is characterized in that the above-mentioned flow control valve has a first main body and a second main body, and the first main body is provided with input and output ports at both ends; the second main body is protruded upward from the middle part in the longitudinal direction of the above-mentioned first main body, and has the above-mentioned flow adjustment part at the upper end; the above-mentioned plate has the above-mentioned installation hole that can be inserted with the above-mentioned flow adjustment part, and the above-mentioned adapter has a ring part, a first holding leg and a second holding leg and a locking arm, and the ring part abuts against the periphery of the above-mentioned installation hole in the surface of the above-mentioned plate; the first holding leg and the second holding leg hang down from the bottom of the radial end parts of the above-mentioned ring part, clamping the above-mentioned flow control valve from both sides. The cam is connected to the front end of the first holding leg by the base end of the first holding leg, and the front end of the second holding leg has a clamping portion, which can be engaged or disengaged with respect to the clamping portion provided at the front end of the second holding leg, and the ring portion abuts against the surface of the plate; the first holding leg and the second holding leg protrude toward the back side of the plate through the mounting hole; the flow adjustment portion passes through the mounting hole toward the surface side; the second body of the flow control valve is clamped between the first holding leg and the second holding leg; the first holding leg and the second holding leg are connected to each other by the locking arm.

[0020] Effects of the Invention

[0021] As described above, according to the present invention, an adapter and an installation structure of a flow control valve using the adapter can be provided, which can easily perform installation operations when the flow control valve is installed in the installation hole of a plate, and the flow control valve has a flow adjustment portion at the front end portion of a second body protruding from the middle portion of a first body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a perspective view of a mounting structure of a flow control valve according to one embodiment of the present invention.

[0023] Figure 2 This is a front view of the installation structure of the flow control valve.

[0024] Figure 3 This is a three-dimensional diagram of a flow control valve.

[0025] Figure 4 is a top view of the board.

[0026] Figure 5 This is a perspective view of the adapter viewed diagonally from below.

[0027] Figure 6 This is a front view of the adapter with the locking arm open.

[0028] Figure 7 is a top view of the adapter.

[0029] Figure 8 is the rear view of the adapter.

[0030] Figure 9 This is a front view of the adapter with the locking arm closed.

[0031] Figure 10 This is a perspective view of the adapter with the ring portion omitted, as seen from obliquely above.

[0032] Figure 11 This is a perspective view of the adapter viewed diagonally from below.

[0033] Figure 12 is with Figure 2 A sectional view of the installation structure of the flow control valve corresponding to the view taken along the XII-XII arrow line. DETAILED DESCRIPTION

[0034] Modes for carrying out the invention

[0035] Hereinafter, the adapter of the present invention and the mounting structure of the flow control valve using the adapter will be described. In addition, in this embodiment, since the adapter is included in the mounting structure of the flow control valve, the adapter will be described in the description of the mounting structure of the flow control valve.

[0036] First, the installation structure of the flow control valve is summarized. Figure 1 and Figure 2 As shown, a flow control valve 50 having a first body 51 and a second body 55 is installed through a mounting hole 71 of a plate 70, wherein the first body 51 extends in the length direction; the second body 55 protrudes upward from the middle portion in the length direction of the first body 51 and has a dial portion (flow adjustment portion) 60 at the upper end portion.

[0037] Flow control valve 50, such as Figure 3 As shown, the apparatus comprises a first body 51 having input / output ports 52a and 52b provided at both ends; a second body 55 projecting upward from the longitudinal middle portion of the first body 51 and extending downward from the lower end of the first body 51, with a dial portion 60 at its upper end; and a pair of cylindrical mounting portions 66 and 67 arranged on either side of the upper end of the second body 55 and extending in a direction perpendicular to the longitudinal direction. In this embodiment, the pair of mounting portions 66 and 67 are provided so as to span both the longitudinal middle portion of the first body 51 and the upper end of the second body 55.

[0038] The second body 55 has a large diameter portion 57 formed in a cylindrical shape; and a small diameter portion 58 connected to the lower end of the large diameter portion 57 and having a smaller diameter than the large diameter portion 57. These large diameter portion 57 and small diameter portion 58 are arranged on the same axis. The small diameter portion 58 extends from the lower end of the first body 51. On the outer peripheral surface of the lower end of the large diameter portion 57, a contact surface 56 facing downward is formed in an annular shape (see Figure 12 The dial portion 60 is cylindrical and rotatably disposed about the axis at the upper end of the large-diameter portion 57. The outer diameter of the dial portion 60 is slightly smaller than that of the large-diameter portion 57. For ease of explanation, the longitudinal direction may be referred to as the "left-right direction," and the direction perpendicular to the longitudinal direction and the up-down direction may be referred to as the "front-back direction."

[0039] Plate 70, such as Figure 4 As shown, it is a plate-like member with a constant thickness, and a circular mounting hole 71 is provided in its center portion for inserting the dial portion 60. In this embodiment, an engaging groove 72 is provided on the inner surface 71a of the mounting hole 71.

[0040] Next, the adapter 1 is described. The adapter 1, such as Figures 5 to 12 As shown, the adapter 1 includes a ring portion 2 for abutting the lower surface 2b around the mounting hole 71 in the surface 70a of the plate 70, allowing the dial portion (flow rate adjustment portion) 60 to pass through the mounting hole 71 toward the surface 70a; first and second retaining legs 7, 8, which extend downward from the lower surface 2b at both radial ends of the ring portion 2 and project toward the back surface 70b of the plate 70 through the mounting hole 71 to clamp the flow control valve 50 from both sides; a locking arm 40 for connecting the first and second retaining legs 7, 8 to each other; and a spring locking piece 20 for abutting the back surface 70b of the plate 70 to attach the adapter 1 to the plate 70. In this embodiment, the adapter 1 is integrally molded from, for example, a synthetic resin material.

[0041] The ring portion 2 is formed into an annular shape and has an insertion hole 2a extending through the upper surface 2c and the lower surface 2b. In this embodiment, the inner diameter of the insertion hole 2a is smaller than the inner diameter of the mounting hole 71 and is large enough to insert the second body 55 of the flow control valve 50.

[0042] The ring portion 2 is provided with a pair of engaging protrusions 4 and 5 projecting from the lower surface 2b at both radial ends. These engaging protrusions 4 and 5 have side surfaces 4a and 5a for contacting the inner surface 71a of the mounting hole 71. In this embodiment, the side surfaces 4a and 5a are curved radially outward along the inner surface 71a of the mounting hole 71. The contact of these engaging protrusions 4 and 5 with the inner surface 71a of the mounting hole 71 allows for radial positioning of the adapter 1 relative to the plate 70.

[0043] Front end surfaces 4b, 5b are formed at the front ends of these engaging protrusions 4, 5. In this embodiment, the front end surfaces 4b, 5b are formed into a flat surface extending in the left-right direction. When the lower surface 2b of the ring portion 2 abuts against the surface 70a of the plate 70, the front end surfaces 4b, 5b protrude downward relative to the back surface 70b of the plate 70 (see FIG. Figure 1 ). When the flow control valve 50 is inserted into the adapter 1, the pair of mounting portions 66 and 67 of the first body 51 come into contact with the front end surfaces 4b and 5b, and the dial portion 60 moves to the positioning position P protruding toward the surface 70a of the plate 70 (see Figure 12 ) state, the flow control valve 50 is positioned upward relative to the plate 70.

[0044] On the side surface 5a of the fitting protrusion 5 arranged on the rear side of these fitting protrusions 4 and 5, a protrusion 5c protruding outward in the radial direction is provided, and this protrusion 5c can be engaged with the engaging groove 72 formed in the mounting hole 71 of the plate 70 (refer to Figure 4 ) engages to prevent the adapter 1 from rotating in the circumferential direction relative to the plate 70.

[0045] In this embodiment, the first holding leg 7 and the second holding leg 8 are arranged on the lower surface 2b of the ring portion 2 at positions offset 90 degrees in the circumferential direction relative to the pair of engaging protrusions 4 and 5. Furthermore, since the first holding leg 7 and the second holding leg 8 are formed to be bilaterally symmetrical, the first holding leg 7 will be described below, and the second holding leg 8 will be assigned a reference numeral corresponding to the first holding leg 7, and its description will be omitted.

[0046] The first retaining leg 7 includes an upper leg 9 extending downward from the lower surface of the ring portion 2; and a lower leg 11 connected to the lower end of the upper leg 9 and having a larger cross-sectional area than the upper leg 9. The upper leg 9 is formed into a rectangular parallelepiped with a width in the front-to-back direction shorter than the length in the top-to-bottom direction. The inner surface 9a of the upper leg 9 is curved along the same surface as the inner surface of the insertion hole portion 2a. Two protrusions 9b protruding radially inward are provided at intervals on both sides of the circumference of the lower end of the inner surface 9a of the upper leg 9. A flat surface 9c extending in the front-to-back direction and a curved portion 9d formed at the radially inner end of the flat surface 9c are provided at the front end of each of these protrusions 9b, 9b. These protrusions 9 b and 9 b are arranged to face the protrusions 9 b and 9 b provided on the second holding leg 8 , and these four bent portions 9 d sandwich the large diameter portion 57 of the flow control valve 50 arranged between the first holding leg 7 and the second holding leg 8 .

[0047] The lower leg portion 11 is formed into a rectangular parallelepiped shape, with its front-to-back width being shorter than its vertical length. The lower leg portion 11 has the same width as the upper leg portion 9, but its horizontal thickness is greater than that of the upper leg portion 9. Furthermore, its vertical length is greater than that of the upper leg portion 9. Furthermore, the upper leg portion 9 is connected to the upper end portion of the lower leg portion 11 on the inner side in the horizontal direction. Therefore, the outer side portion of the lower leg portion 11 in the horizontal direction is located outward of the upper leg portion 9.

[0048] The inner surface 11a of the lower leg portion 11 has a curved surface 11b that curves along the outer peripheral surface of the small-diameter portion 58 of the second body 55 in the flow control valve 50. In this embodiment, when the small-diameter portion 58 of the second body 55 is inserted between the respective curved surfaces of the first holding leg portion 7 and the second holding leg portion 8, the two sides of the small-diameter portion 58 are sandwiched between these curved surfaces 11b, 11b.

[0049] A stopper portion 13 is provided below the curved surface 11b of the lower leg 11, protruding radially inward. A contact surface 13a is formed on the upper surface of this stopper portion 13, extending in the front-to-back direction and facing upward. This contact surface 13a supports the flow control valve 50 held between the first retaining leg 7 and the second retaining leg 8 from below.

[0050] In this embodiment, an upward-facing abutting surface 11c is also formed in an annular shape on the upper end portion of the inner surface 11a of the lower leg portion 11 (see FIG. Figure 12 This abutment surface 11c can be supported from below relative to the abutment surface 56 of the large diameter portion 57 of the second body 55 of the flow control valve 50 sandwiched between the first holding leg 7 and the second holding leg 8 (see Figure 12 ).

[0051] The ring portion 2 is provided with a pair of spring retaining pieces 20, 20, which are suspended from the lower surface 2b of its radial end portions. Each of the pair of spring retaining pieces 20, 20 is inclined radially outward toward the front end and can be elastically deformed radially inward. In this embodiment, the pair of spring retaining pieces 20 are formed in a plate shape and are arranged radially outward of the upper legs 9, 9 of the first retaining leg 7 and the second retaining leg 8. In addition, these spring retaining pieces 20 are inclined so that the distance between their upper ends is smaller than the inner diameter of the mounting hole 71, and the distance between their lower ends is larger than the inner diameter of the mounting hole 71.

[0052] Furthermore, each of these spring locking pieces 20 is provided with a stepped portion 24 for contacting upward with the back surface 70b of the plate 70. In this embodiment, a contact surface 24a is formed on the upper portion of the stepped portion 24, which is capable of contacting the back surface 70b of the plate 70. In this embodiment, the stepped portion 24 is formed with a plurality of steps in a stepped manner on the outer surface 20a of the radially outer side of the spring locking piece 20.

[0053] A guide plate 21 extending downward is connected to each of the lower ends of the spring locking pieces 20. The guide plates 21 are plate-shaped and tilted radially inwardly downward. The lower ends of the guide plates 21 are connected to the retaining legs 7 and 8 adjacent to the guide plates 21, 21. In this embodiment, the guide plates 21 can be elastically deformed in the radial direction with their lower ends serving as a fulcrum.

[0054] Next, the locking arm 40 will be described. The base end of the locking arm 40 is rotatably connected to the front end of the first retaining leg 7. The front end of the locking arm 40 includes an engaged portion 43 that can be engaged or disengaged with the engaging portion 15 provided at the front end of the second retaining leg 8. In this embodiment, the locking arm 40 includes an arm body 41 connected to the front end of the first retaining leg 7; an arm bend 42 that protrudes from the inner surface of the front end of the arm body 41; and an engaged portion 43 provided at the front end of the arm bend 42. The base end of the arm body 41 is connected to the first retaining leg 7 via a bendable, plate-shaped connecting portion 44.

[0055] The engaging portion 15 has a recessed portion 15a formed on the outer surface of the lower end portion of the second retaining leg 8. The inner surface 15b on the lower side of the recessed portion 15a is formed into a flat surface along the left-right direction (radial direction). In addition, an inclined guide surface 16 is provided on the outer surface of the second retaining leg 8 below the recessed portion 15a, which is inclined radially outward toward the recessed portion 15a to guide the movement of the protrusion 45.

[0056] The engaged portion 43 includes a protrusion 45 that projects from the front end of the arm bend 42 toward the inner surface of the arm bend 42 and engages with the inner surface 15b of the recess 15a. When the lock arm 40 is rotated from the open position to the closed position, the protrusion 45 moves on the inclined guide surface 16 and engages with the recess 15a.

[0057] Next, refer to Figure 12Next, we will explain how to mount the flow control valve 50 on the plate 70 using the adapter 1. First, mount the adapter 1 on the plate 70. Specifically, insert the first retaining leg 7 and the second retaining leg 8 of the adapter 1 into the mounting hole 71 of the plate 70 from the surface 70a of the plate 70. Then, as these retaining legs 7 and 8 are inserted into the mounting hole 71, the outer surfaces of the pair of guide plates 21 slide against the inner surfaces 71a of the mounting hole 71. Simultaneously, these guide plates 21 deform radially inward, and the pair of spring retaining plates 20 also deform radially inward. Consequently, the pair of spring retaining plates 20 are inserted into the mounting hole 71.

[0058] When the lower surface 2b of the ring portion 2 abuts the surface 70a of the plate 70, the pair of engaging protrusions 4 and 5 engage with the mounting hole 71. Furthermore, any abutting surface 24a of the plurality of stepped portions 24 abuts the back surface 70b of the plate 70. This positions the adapter 1 radially and upwardly relative to the plate 70. Furthermore, any outer surface between the plurality of stepped portions 24 biases the inner surface 71a of the mounting hole 71 radially outward, thereby suppressing radial movement of the adapter 1 relative to the plate 70. Furthermore, the engagement of the protrusion 5c of the engaging protrusion 5 with the engaging groove 72 of the plate 70 prevents axial rotation of the adapter 1 relative to the plate 70.

[0059] Next, the flow control valve 50 is mounted on the adapter 1. In this case, the flow control valve 50 is inserted between the first holding leg 7 and the second holding leg 8 from the front end side of the adapter 1, and the dial portion 60 is moved to a positioning position P where it protrudes from the surface 70a of the plate 70. Then, the second body 55 of the flow control valve 50 is sandwiched between the first holding leg 7 and the second holding leg 8, and the first holding leg 7 and the second holding leg 8 are connected to each other by the lock arm 40, completing the mounting of the flow control valve 50 on the plate 70.

[0060] In this manner, the mounting structure of the flow control valve 50 mounted on the plate 70 using the adapter 1 is as follows: the ring portion 2 abuts against the surface 70a of the plate 70, the first retaining leg 7 and the second retaining leg 8 protrude toward the back surface 70b of the plate 70 through the mounting hole 71, the dial portion 60 penetrates through the mounting hole 71 toward the surface 70a of the plate 70, the second body 55 of the flow control valve 50 is clamped between the first retaining leg 7 and the second retaining leg 8, and the first retaining leg 7 and the second retaining leg 8 are connected to each other by the locking arm 40. Therefore, no tools are required for mounting the flow control valve 50, and the mounting operation is also easy. Therefore, it is possible to provide an adapter 1 that facilitates mounting the flow control valve 50 on the plate 70, and a mounting structure for the flow control valve 50 using the adapter 1.

[0061] Furthermore, in the above-described embodiment, the flow control valve 50 is positioned upward relative to the adapter 1 by causing the mounting portions 66 and 67 of the first body 51 to abut against the front end surfaces 4 b and 5 b of the fitting protrusions 4 and 5 , but the present invention is not limited thereto. If the plate 70 is thicker, the flow control valve 50 may be positioned upward relative to the adapter 1 by causing the mounting portions 66 and 67 to abut against the back surface 70 b of the plate 70.

[0062] Explanation of symbols

[0063] 1: Adapter

[0064] 2: Ring

[0065] 2b: Below

[0066] 4, 5: Fitting protrusion

[0067] 4a, 5a: Side

[0068] 4b, 5b: front end

[0069] 5c: protrusion

[0070] 7: First holding leg

[0071] 8: Second holding leg

[0072] 13: Stopper

[0073] 13a: abutment surface

[0074] 15: snap-fit portion

[0075] 15a: concave part

[0076] 16: Inclined guide surface

[0077] 20: Spring locking piece

[0078] 20a: Outside

[0079] 21: Guide plate

[0080] 24: Step

[0081] 40: Locking arm

[0082] 41: Arm body

[0083] 42: arm bend

[0084] 43: Engaged portion

[0085] 45: protrusion

[0086] 50: Flow control valve

[0087] 51: First Subject

[0088] 52a, 52b: Input and output ports

[0089] 55: Second Subject

[0090] 60: Dial (flow adjustment)

[0091] 70: Board

[0092] 70a: Surface

[0093] 70b: Back

[0094] 71: Mounting hole

[0095] 71a:Inner surface

[0096] 72: Engagement slot.

Claims

1. An adapter for mounting a flow control valve having a first body and a second body through a mounting hole in a plate, wherein the first body has input and output ports at both ends; the second body protrudes upward from a longitudinally intermediate portion of the first body and has a flow adjustment portion at its upper end, the adapter being characterized by: The adapter comprises a ring portion, a first holding leg portion, a second holding leg portion, and a locking arm, wherein the ring portion is used to abut against the periphery of the above-mentioned mounting hole in the surface of the above-mentioned plate so that the above-mentioned flow adjustment portion passes through the above-mentioned mounting hole toward the above-mentioned surface side; the first holding leg portion and the second holding leg portion are used to hang down from the above-mentioned lower surface of both ends of the above-mentioned ring portion in the radial direction, and clamp the above-mentioned second body of the above-mentioned flow control valve from both sides while protruding toward the back side of the above-mentioned plate through the above-mentioned mounting hole; the locking arm connects the above-mentioned first holding leg portion and the second holding leg portion to each other, The base end of the locking arm is rotatably connected to the front end of the first holding leg. The front end of the locking arm has an engaged portion that can be engaged with or disengaged from the engaging portion provided at the front end of the second holding leg.

2. The adapter according to claim 1, wherein: The ring portion is provided with a pair of engaging protrusions protruding from the lower surface of both ends in the radial direction. The fitting protrusion has a side surface for contacting the inner surface of the mounting hole.

3. The adapter according to claim 2, wherein: A protrusion for engaging with an engagement groove provided on the inner surface of the mounting hole of the plate is provided on one of the side surfaces of the pair of fitting protrusions.

4. The adapter according to claim 2 or 3, characterized in that: The engaging protrusion has a front end surface at its front end portion. The front end surface of the fitting protrusion can cause the flow control valve to abut against it, thereby positioning the flow control valve upward.

5. The adapter according to claim 1, wherein: The ring portion is also provided with a pair of spring locking pieces hanging down from the lower sides of the two radial ends thereof. Each of the pair of spring locking pieces is inclined radially outward toward the front end side and can be elastically deformed radially inward.

6. The adapter according to claim 5, wherein: The spring locking piece is provided with a step portion for contacting the back surface of the plate toward its base end side. The step portion has a plurality of steps formed in a stepped manner on an outer surface facing radially outward of the spring locking piece.

7. The adapter according to claim 6, wherein: The pair of spring locking pieces are arranged on the radially outer sides of the first holding leg and the second holding leg, A guide plate extending downward is connected to the front end of each of the pair of spring locking pieces. The guide plates are inclined radially inwardly downward from respective front end portions of the pair of spring locking pieces, and lower end portions of the guide plates are connected to the holding legs adjacent to the guide plates.

8. The adapter according to claim 1, wherein: The locking arm comprises an arm main body, an arm bent portion, and the engaged portion, wherein the arm main body is connected to the front end portion of the first holding leg; the arm bent portion protrudes from the front end portion of the arm main body; the engaged portion is provided at the front end portion of the arm bent portion, The engaged portion includes a protrusion protruding from the front end of the arm bending portion. The engaging portion of the second holding leg has a recess formed on the outer surface of the second holding leg and capable of engaging with the protrusion. An inclined guide surface is provided on the outer surface of the second holding leg on the front end side relative to the recess. The inclined guide surface is inclined radially outward toward the recess to guide movement of the protrusion.

9. The adapter according to claim 1, wherein: A stopper protruding radially inward is provided on the inner surface of each of the first holding leg and the second holding leg. The stopper has a contact surface for supporting, from below, the flow control valve held between the first holding leg and the second holding leg.

10. A flow control valve mounting structure, wherein the flow control valve having a flow adjustment portion is mounted in a mounting hole of a plate via an adapter, characterized in that: The flow control valve comprises a first body and a second body, wherein the first body is provided with input and output ports at both ends; the second body is provided to protrude upward from the middle portion in the longitudinal direction of the first body and has the flow adjustment portion at the upper end. The plate has the mounting hole through which the flow rate adjustment portion can be inserted. The adapter comprises a ring portion, a first holding leg portion, a second holding leg portion, and a locking arm. The ring portion abuts against the periphery of the mounting hole in the surface of the plate. The first holding leg portion and the second holding leg portion hang down from the lower side of both radial ends of the ring portion to clamp the flow control valve from both sides. The locking arm connects the first holding leg portion and the second holding leg portion to each other. The base end portion of the locking arm is rotatably connected to the front end portion of the first holding leg, and the front end portion of the locking arm has an engaged portion that can be engaged with and disengaged from the engaging portion provided at the front end portion of the second holding leg. The above-mentioned ring portion abuts against the above-mentioned surface of the above-mentioned plate; the above-mentioned first holding leg and the second holding leg protrude toward the back side of the above-mentioned plate through the above-mentioned mounting hole; the above-mentioned flow adjustment portion passes through the above-mentioned mounting hole toward the above-mentioned surface side; the above-mentioned second body of the above-mentioned flow control valve is clamped between the above-mentioned first holding leg and the second holding leg; the above-mentioned first holding leg and the second holding leg are connected to each other by the above-mentioned locking arm.

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