Adapter and attachment structure of frow control valve using the same

Abstract

To provide an adapter which facilitates work of attaching a flow control valve, having a dial part at a tip part of a second body which is provided protruding in a first body, to an attachment hole of a plate, and to provide an attachment structure of the flow control valve.SOLUTION: An adapter 1 attaches a flow control valve 50, having a first body 51 and a second body 55 protruding from an intermediate part of the first body and having a dial part 60 at a tip, to an attachment hole of a plate 70. The adapter 1 has: a ring part 2 for allowing the dial part to penetrate to the surface side through the attachment hole with its lower surface placed in contact with a periphery of the attachment hole on a surface of the plate; first and second holding leg parts 7, 8 which hang from lower surfaces of both radial ends of the ring part to sandwich the flow control valve from both sides; and a lock arm which connects the leg parts. A base end of the lock arm is rotatably connected to a lower end of the first holding leg part and a tip of the lock arm has an engaged part which may be engaged with or disengaged from an engaging part provided at a lower end of the second holding leg part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Various types of flow control valves have been known in the past, each having a flow rate adjusting portion at the tip of a second body protruding from the middle of a first body. As described in Patent Documents 1 and 2, for example, these conventional flow control valves are configured to have 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 top end of the second cylindrical portion, and a flow rate adjusting handle (flow rate adjusting portion) disposed at the tip of the third cylindrical portion.

[0003] Such a flow control valve is used in a state where it is attached to, for example, a plate, and this attachment can be achieved, for example, by using a nut. However, the work of fastening the nut requires the use of a tool, and the preparation of the tool and the fastening work tend to be cumbersome. Therefore, a method that makes it easy to attach the flow control valve to the plate is desired. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Re-tabled publication No. 2011 / 024275 [Patent Document 2] Design Registration No. 1520214 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the technical object of the present invention is to provide an adapter that can easily perform the installation work when attaching a flow control valve having a flow adjustment portion at the tip of a second body that protrudes from the middle portion of a first body to a plate, and an installation structure for a flow control valve using the adapter. [Means for solving the problem]

[0006] In order to solve the above problem, the adapter of the present invention is an adapter for mounting a flow control valve, which has a first body with input / output ports at both ends, and a second body protruding upward from a longitudinal intermediate portion of the first body and having a flow rate adjustment portion at its upper end, through a mounting hole in a plate, the adapter comprising: a ring portion whose underside abuts against the periphery of the mounting hole on the surface of the plate to pass the flow rate adjustment portion through the mounting hole to the surface side; first retaining legs and second retaining legs that hang down from the undersides of both radial ends of the ring portion and protrude through the mounting hole to the back side of the plate, for clamping the second body of the flow control valve from both sides; and a locking arm that connects the first and second retaining legs to each other, wherein the base end of the locking arm is rotatably connected to the tip end of the first retaining leg, and the tip end of the locking arm has an engaged portion that can be engaged with and disengaged from an engaging portion provided at the tip end of the second retaining leg.

[0007] In this case, preferably, the ring portion is provided with a pair of mating protrusions protruding from the underside of both radial ends thereof, and the mating protrusions have side surfaces for abutting against the inner surface of the mounting hole.

[0008] Preferably, the side surface of the fitting protrusion is provided with a protrusion for engaging with an engaging groove provided on the inner surface of the mounting hole of the plate.

[0009] Preferably, the fitting projection has a tip end surface at its tip end, and the flow control valve can be positioned above the tip end surface of the fitting projection by abutting the flow control valve against the tip end surface.

[0010] Preferably, the ring portion further has a pair of spring locking pieces hanging down from the underside of both radial ends thereof, each of the pair of spring locking pieces inclining radially outward toward the tip side and being elastically deformable radially inward.

[0011] Preferably, the spring locking piece has a step portion facing its base end side for abutting against the back surface of the plate, the step portion being formed in a staircase pattern on an outer surface of the spring locking piece facing radially outward. Preferably, the pair of spring locking pieces is disposed radially outward of the first and second holding legs, respectively, and guide plates extending downward are connected to the respective tip ends of the pair of spring locking pieces, the guide plates inclined radially inward as they extend downward from the respective tip ends of the pair of spring locking pieces, and lower ends of the guide plates are connected to the holding leg of the first or second holding leg that the guide plate is adjacent to.

[0012] Preferably, the locking arm comprises an arm main body connected to the tip of the first retaining leg, an arm bending portion protruding from the tip of the arm main body, and the engaged portion provided at the tip of the arm bending portion, wherein the engaged portion has a protrusion protruding from the tip of the arm bending portion, and the engaging portion of the second retaining leg has a recess formed on the outer surface of the second retaining leg with which the protrusion can engage, and an inclined guide surface is provided on the outer surface of the second retaining leg further to the tip than the recess, which is inclined radially outward toward the recess and which guides the movement of the protrusion.

[0013] Preferably, a stopper portion protruding radially inward is provided on the inner surface of each of the first and second holding legs, and the stopper portion has an abutment surface for supporting the flow control valve sandwiched between the first and second holding legs from below.

[0014] Further, a mounting structure for a flow control valve according to the present invention is a mounting structure for a flow control valve in which a flow control valve having a flow rate adjusting portion is mounted to a mounting hole in a plate via an adapter, the flow control valve comprising: a first body having input / output ports at both ends thereof; and a second body projecting upward from a longitudinal intermediate portion of the first body and having the flow rate adjusting portion at its upper end; the plate has the mounting hole through which the flow rate adjusting portion can be inserted; the adapter comprises a ring portion abutting against the periphery of the mounting hole on the surface of the plate; first and second holding legs hanging down from the undersides of both radial ends of the ring portion and holding the flow control valve from both sides; and a lock arm that interconnects the holding legs, wherein a base end of the lock arm is rotatably connected to a tip end of the first holding leg, the tip end of the lock arm has an engaged portion that can be engaged with and disengaged from an engaging portion provided at the tip end of the second holding leg, the ring portion abuts against the surface of the plate, the first and second holding legs protrude through the mounting hole to the back side of the plate, the flow rate adjustment portion penetrates through the mounting hole to the surface side, the second body of the flow control valve is sandwiched between the first and second holding legs, and the first and second holding legs are interconnected by the lock arm. [Effects of the Invention]

[0015] As described above, according to the present invention, it is possible to provide an adapter that allows easy installation work when installing a flow control valve having a flow adjustment portion at the tip of a second body that protrudes from the middle portion of a first body into an installation hole in a plate, and an installation structure for a flow control valve that uses the adapter. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view of a mounting structure for a flow control valve according to an embodiment of the present invention; [Figure 2] FIG. 2 is a front view of the mounting structure for the flow control valve. [Figure 3] FIG. 2 is a perspective view of a flow control valve. [Figure 4] FIG. [Figure 5] FIG. 2 is a perspective view of the adapter as seen from diagonally below. [Figure 6] FIG. 10 is a front view of the adapter with the lock arm in an open state. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is a front view of the adapter with the locking arm in a closed state. [Figure 10] FIG. 10 is a perspective view of the adapter from which the ring portion is omitted, as viewed obliquely from above. [Figure 11] FIG. 2 is a perspective view of the adapter as seen from diagonally below. [Figure 12] 12 is a cross-sectional view of the mounting structure of the flow control valve taken along the line XII-XII in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0017] The adapter and the mounting structure for a flow control valve using the adapter according to the present invention will be described below. In this embodiment, the adapter is included in the mounting structure for the flow control valve, so the adapter will be described in the description of the mounting structure for the flow control valve.

[0018] First, an outline of the mounting structure of the flow control valve will be given. As shown in Figures 1 and 2, the mounting structure of the flow control valve is such that the flow control valve 50, which has a first body 51 extending in the longitudinal direction and a second body 55 protruding upward from the middle of the first body 51 in the longitudinal direction and having a dial portion 60 (flow rate adjusting portion) at its upper end, is mounted through a mounting hole 71 in a plate 70.

[0019] 3, the flow control valve 50 includes a first body 51 having input / output ports 52a, 52b at both ends thereof, a second body 55 that protrudes upward from a longitudinal intermediate portion of the first body 51 and extends downward from the lower end of the first body 51, and has a dial portion 60 at its upper end, and a pair of cylindrical mounting portions 66, 67 that are disposed on both sides of the upper end of the second body 55 and extend in a direction perpendicular to the longitudinal direction. In this embodiment, the pair of mounting portions 66, 67 are provided so as to straddle both the longitudinal intermediate portion of the first body 51 and the upper end of the second body 55.

[0020] The second body 55 has a cylindrical large-diameter portion 57 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. The large-diameter portion 57 and the small-diameter portion 58 are arranged coaxially. The small-diameter portion 58 extends from the lower end of the first body 51. A downward-facing contact surface 56 is formed in an annular shape on the outer peripheral surface of the lower end of the large-diameter portion 57 (see FIG. 12). The dial portion 60 is formed in a cylindrical shape and is arranged at the upper end of the large-diameter portion 57 so as to be rotatable about its axis. The outer diameter of the dial portion 60 is slightly smaller than that of the large-diameter portion 57. For convenience 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-rear direction."

[0021] 4, the plate 70 is a plate-like member with a constant thickness, and has a circular mounting hole 71 in the center thereof through which the dial part 60 can be inserted. In this embodiment, an engagement groove 72 is formed on an inner surface 71a of the mounting hole 71.

[0022] Next, the adapter 1 will be described. As shown in Figures 5 to 12, the adapter 1 includes a ring portion 2 whose underside 2b abuts against the periphery of a mounting hole 71 in a front surface 70a of a plate 70, allowing the dial portion 60 (flow rate adjusting portion) to penetrate through the mounting hole 71 to the front surface 70a, a first holding leg 7 and a second holding leg 8 that hang down from the underside 2b at both radial ends of the ring portion 2 and protrude through the mounting hole 71 to the back surface 70b of the plate 70, for clamping the flow rate control valve 50 from both sides, a lock arm 40 that interconnects the first and second holding legs 7, 8, and a spring locking piece 20 that abuts against 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.

[0023] The ring portion 2 is formed in an annular shape, and has an insertion hole 2a that penetrates between its upper surface 2c and 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 has a size that allows the second body 55 of the flow control valve 50 to be inserted therethrough.

[0024] The ring portion 2 is provided with a pair of fitting protrusions 4, 5 that protrude from the underside 2b at both radial ends thereof. The fitting protrusions 4, 5 have side surfaces 4a, 5a for abutting against the inner surface 71a of the mounting hole 71. In this embodiment, the side surfaces 4a, 5a face radially outward and curve along the inner surface 71a of the mounting hole 71. By abutting these fitting protrusions 4, 5 against the inner surface 71a of the mounting hole 71, the adapter 1 can be positioned radially relative to the plate 70.

[0025] Tip surfaces 4b, 5b are formed at the tips of these fitting protrusions 4, 5. In this embodiment, the tip surfaces 4b, 5b are formed as flat surfaces extending in the left-right direction. These tip surfaces 4b, 5b protrude downward from the back surface 70b of the plate 70 when the lower surface 2b of the ring portion 2 abuts against the front surface 70a of the plate 70 (see FIG. 1). When the flow control valve 50 is inserted into the adapter 1 and the pair of mounting portions 66, 67 of the first body 51 abut against these tip surfaces 4b, 5b, the dial portion 60 moves to a positioning position P (see FIG. 12) where it protrudes toward the front surface 70a of the plate 70, and the flow control valve 50 is positioned upward relative to the plate 70.

[0026] Of these mating protrusions 4, 5, the mating protrusion 5 located on the rear side has a protrusion 5c on its side surface 5a that protrudes radially outward, and this protrusion 5c can engage with an engagement groove 72 (see Figure 4) formed in the mounting hole 71 of the plate 70, thereby preventing the adapter 1 from rotating circumferentially relative to the plate 70.

[0027] In this embodiment, the first retaining leg 7 and the second retaining leg 8 are disposed on the underside 2b of the ring portion 2 at positions circumferentially shifted by 90 degrees from the pair of fitting protrusions 4, 5. Since the first and second retaining legs 7, 8 are formed symmetrically, only the first retaining leg 7 will be described, and the second retaining leg 8 will be assigned the same reference numeral as the first retaining leg 7 and its description will be omitted.

[0028] The first retaining leg 7 includes an upper leg 9 extending downward from the underside 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 in a rectangular parallelepiped shape with its width in the front-to-rear direction shorter than its length in the up-to-down direction. The inner surface 9a of the upper leg 9 is curved along the same plane as the inner surface of the insertion hole 2a. Two protrusions 9b protruding radially inward are provided at both circumferential sides of the lower end of the inner surface 9a of the upper leg 9, spaced apart circumferentially. The tip of each of these protrusions 9b is provided with a flat portion 9c extending along the front-to-rear direction and a curved portion 9d formed at the radially inner end of the flat portion 9c. These protrusions 9b, 9b are arranged opposite the protrusions 9b, 9b provided on the second holding leg 8, and these four curved portions 9d clamp the large diameter portion 57 of the flow control valve 50 arranged between the first and second holding legs 7, 8.

[0029] The lower leg 11 is formed in the shape of a rectangular parallelepiped, with its width in the front-to-rear direction being shorter than its length in the up-down direction. The lower leg 11 has the same width as the upper leg 9, but its thickness in the left-to-right direction is greater than that of the upper leg 9, and its length in the up-to-down direction is greater than that of the upper leg 9. The upper leg 9 is connected to the upper end of the lower leg 11 on the inner side in the left-to-right direction. Therefore, the outer side of the lower leg 11 in the left-to-right direction is located outside the upper leg 9.

[0030] The inner surface 11a of the lower leg 11 has a curved surface 11b that curves along the outer circumferential surface of the small diameter portion 58 of the second body 55 of the flow control valve 50. In this embodiment, with the small diameter portion 58 of the second body 55 inserted between the curved surfaces 11b, 11b of the first and second holding legs 7, 8, the small diameter portion 58 is sandwiched between these curved surfaces 11b, 11b.

[0031] A stopper portion 13 that protrudes radially inward is provided below the curved surface 11b of the lower leg portion 11. An abutment surface 13a that extends in the front-rear direction and faces upward is formed on the upper surface of this stopper portion 13. This abutment surface 13a can support the flow control valve 50 that is sandwiched between the first and second holding legs 7, 8 from below.

[0032] In this embodiment, an upwardly facing contact surface 11c (see FIG. 12) is also formed in an annular shape at the upper end of the inner surface 11a of the lower leg 11. This contact surface 11c can support from below against a contacted surface 56 (see FIG. 12) formed on the large diameter portion 57 of the second body 55 of the flow control valve 50 sandwiched between the first and second holding legs 7, 8.

[0033] The ring portion 2 is provided with a pair of spring locking pieces 20, 20 hanging down from the underside 2b of both radial ends thereof. Each of the pair of spring locking pieces 20, 20 is inclined radially outward toward the tip end and is elastically deformable radially inward. In this embodiment, the pair of spring locking pieces 20 are formed in a plate shape and disposed radially outward of the upper leg portions 9, 9 of the first and second retaining legs 7, 8, respectively. The spring locking 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 greater than the inner diameter of the mounting hole 71.

[0034] Each of the spring locking pieces 20 is provided with a step portion 24 that faces upward and abuts against the back surface 70b of the plate 70. In this embodiment, an abutment surface 24a that can abut against the back surface 70b of the plate 70 is formed at the top of the step portion 24. In this embodiment, the step portion 24 is formed in a stepped pattern with multiple steps on the outer surface 20a of the spring locking piece 20 that is radially outward.

[0035] A guide plate 21 extending downward is connected to the lower end of each of these spring locking pieces 20. These guide plates 21 are formed in a plate shape and are inclined radially inward as they extend downward. The lower ends of these guide plates 21 are connected to the adjacent holding leg 7, 8 of the first or second holding leg 7, 8. In this embodiment, the guide plate 21 is elastically deformable in the radial direction with its lower end as a fulcrum.

[0036] Next, the lock arm 40 will be described. The base end of the lock arm 40 is rotatably connected to the tip end of the first holding leg 7, and the tip end of the lock arm 40 has an engaged portion 43 that can be engaged with and disengaged from an engaging portion 15 provided at the tip end of the second holding leg 8. In this embodiment, the lock arm 40 includes an arm main body 41 connected to the tip end of the first holding leg 7, an arm bending portion 42 that protrudes from the inner surface of the tip end of the arm main body 41, and an engaged portion 43 provided at the tip end of the arm bending portion 42. The base end of the arm main body 41 is connected to the first holding leg 7 via a bendable plate-shaped connecting portion 44.

[0037] The engaging portion 15 has a recess 15a formed on the outer surface of the lower end of the second holding leg 8, and an inner surface 15b below this recess 15a is formed in a flat shape along the left-right direction (radial direction). In addition, an inclined guide surface 16 that is inclined radially outward toward the recess 15a side and that guides the movement of the protrusion 45 is provided on the outer surface of the second holding leg 8 below the recess 15a.

[0038] The engaged portion 43 has a protrusion 45 that protrudes from the tip of the arm bending portion 42 toward the inner surface of the arm bending portion 42 and can engage with the inner surface 15b of the recess 15a. When the lock arm 40 is rotated from the open state to the closing direction, the protrusion 45 moves on the inclined guide surface 16 and engages with the recess 15a.

[0039] Next, a method for attaching the flow control valve 50 to the plate 70 using the adapter 1 will be described with reference to FIG. 12 . First, the adapter 1 is attached to the plate 70. That is, the first and second retaining legs 7, 8 of the adapter 1 are inserted into the mounting hole 71 of the plate 70 from the front surface 70a side of the plate 70. Then, when these retaining legs 7, 8 are inserted into the mounting hole 71, the outer surfaces of the pair of guide plates 21 slide along the inner surface 71a of the mounting hole 71, causing the guide plates 21 to deform radially inward, and the pair of spring locking pieces 20, 20 also deform radially inward. Therefore, the pair of spring locking pieces 20, 20 are inserted into the mounting hole 71.

[0040] When the lower surface 2b of the ring portion 2 abuts against the surface 70a of the plate 70, the pair of fitting protrusions 4, 5 are fitted into the mounting hole 71, and the abutment surface 24a of one of the multiple step portions 24 abuts against the back surface 70b of the plate 70. Therefore, the adapter 1 is positioned radially and upwardly relative to the plate 70. Furthermore, the outer surface of one of the multiple step portions 24 urges the inner surface 71a of the mounting hole 71 radially outward, thereby suppressing radial rattle of the adapter 1 relative to the plate 70. Furthermore, the protruding portion 5c of the fitting protrusion 5 engages with the engaging groove 72 of the plate 70, thereby preventing the adapter 1 from rotating about its axis relative to the plate 70.

[0041] Next, the flow control valve 50 is attached to the adapter 1. In this case, the flow control valve 50 is inserted between the first and second holding legs 7, 8 from the tip sides thereof, and moved to a positioning position P where the dial portion 60 protrudes from the surface 70a side of the plate 70. Then, the second body 55 of the flow control valve 50 is sandwiched between the first and second holding legs 7, 8, and the first and second holding legs 7, 8 are connected to each other by the lock arm 40, completing the attachment of the flow control valve 50 to the plate 70.

[0042] In this manner, the mounting structure of the flow control valve 50 mounted to the plate 70 using the adapter 1 has the ring portion 2 abutting against the surface 70a of the plate 70, the first and second retaining legs 7, 8 protruding toward the back surface 70b of the plate 70 through the mounting hole 71, the dial portion 60 penetrating through the mounting hole 71 toward the surface 70a of the plate 70, the second body 55 of the flow control valve 50 being sandwiched between the first and second retaining legs 7, 8, and the first and second retaining legs 7, 8 being interconnected by the lock arm 40. Therefore, no tools are required when mounting the flow control valve 50, and the mounting work is easy. Therefore, it is possible to provide an adapter 1 that facilitates the mounting work of the flow control valve 50 to the plate 70, and a mounting structure for the flow control valve 50 using the adapter 1.

[0043] In the embodiment described above, the flow control valve 50 is positioned upward relative to the adapter 1 by abutting the mounting portions 66, 67 of the first body 51 against the tip surfaces 4b, 5b of the fitting protrusions 4, 5, but this is not limited to this. If the plate 70 is thicker, the mounting portions 66, 67 may be abutted against the back surface 70b of the plate 70, thereby positioning the flow control valve 50 upward relative to the adapter 1. [Explanation of symbols]

[0044] 1 adapter 2 Ring section 2b Bottom side 4, 5 Mating protrusion 4a, 5a side 4b, 5b Tip surface 5c protrusion 7 First holding leg 8 Second holding leg 13 Stopper part 13a Contact surface 15 Engagement part 15a Recess 16 Inclined guide surface 20 Spring locking piece 20a Exterior 21 Guide plate 24 Step section 40 Lock Arm 41 Arm body 42 Arm bending part 43 Engaged part 45 Protrusion 50 Flow control valve 51 First Body 52a, 52b input / output ports 55 Second Body 60 Dial section (flow rate adjustment section) 70 plates 70a surface 70b back side 71 Mounting hole 71a Inner surface 72 Engagement groove

Claims

1. An adapter for mounting a flow control valve having a first body with input / output ports at both ends and a second body projecting upward from a longitudinal intermediate portion of the first body and having a flow rate adjusting portion at an upper end thereof, through a mounting hole in a plate, the adapter has a ring portion whose underside abuts against the periphery of the mounting hole on the surface of the plate and allows the flow rate adjustment portion to pass through the mounting hole to the surface side; first holding legs and second holding legs that hang down from the underside of both radial ends of the ring portion and protrude through the mounting hole to the back surface side of the plate to hold the second body of the flow rate control valve from both sides; and a lock arm that connects the first and second holding legs to each other, a base end of the lock arm is rotatably connected to a tip end of the first holding leg, and the tip end of the lock arm has an engaged portion that can be engaged with and disengaged from an engaging portion provided at the tip end of the second holding leg; An adapter characterized by:

2. The ring portion is provided with a pair of fitting protrusions protruding from the lower surface at both radial ends thereof, The fitting protrusion has a side surface for abutting against the inner surface of the mounting hole.

2. The adapter of claim 1.

3. a protrusion for engaging with an engaging groove formed on the inner surface of the mounting hole of the plate is provided on the side surface of the fitting protrusion; 3. The adapter of claim 2.

4. The fitting protrusion has a tip surface at its tip, The flow control valve can be positioned above the tip end surface of the fitting protrusion by abutting the flow control valve against the tip end surface.

4. An adapter according to claim 2 or 3.

5. The ring portion further includes a pair of spring locking pieces that hang down from the lower surface of both radial ends of the ring portion, Each of the pair of spring locking pieces is inclined radially outward toward the tip end side and is elastically deformable radially inward.

2. The adapter of claim 1.

6. The spring locking piece has a step portion facing a base end side thereof for contacting the back surface of the plate, The step portion is formed in a stepped manner on an outer surface of the spring locking piece facing radially outward.

6. The adapter of claim 5.

7. the pair of spring locking pieces are disposed radially outward of the first and second holding legs, respectively; A guide plate extending downward is connected to each tip of the pair of spring locking pieces, The guide plates are inclined radially inward downward from the tip ends of the pair of spring locking pieces, and lower ends of the guide plates are connected to the adjacent one of the first or second holding legs.

7. The adapter of claim 6.

8. the lock arm includes an arm main body connected to a tip end of the first holding leg, an arm bent portion protruding from the tip end of the arm main body, and the engaged portion provided at the tip end of the arm bent portion, the engaged portion has a protrusion that protrudes from a tip end of the arm bent portion, the engaging portion of the second holding leg has a recess formed on an outer surface of the second holding leg and capable of engaging with the protrusion, An outer surface of the second holding leg portion on the tip side of the recessed portion is provided with an inclined guide surface that is inclined radially outward toward the recessed portion and that guides movement of the protrusion.

2. The adapter of claim 1.

9. a stopper portion protruding radially inward is provided on an inner surface of each of the first and second holding legs, The stopper portion has an abutment surface for supporting the flow control valve sandwiched between the first and second holding legs from below.

2. The adapter of claim 1.

10. A mounting structure for a flow control valve in which a flow control valve having a flow rate adjusting portion is mounted in a mounting hole of a plate via an adapter, the flow control valve includes a first body having input / output ports at both ends thereof, and a second body projecting upward from a longitudinal intermediate portion of the first body and having the flow rate adjusting portion at an upper end thereof, the plate has the mounting hole through which the flow rate adjusting portion can be inserted, the adapter has a ring portion that abuts against the periphery of the mounting hole on the surface of the plate, first and second holding legs that hang down from the underside of both radial ends of the ring portion and hold the flow control valve from both sides, and a lock arm that interconnects the first and second holding legs, a base end of the lock arm is rotatably connected to a tip end of the first holding leg, and the tip end of the lock arm has an engaged portion that can be engaged with and disengaged from an engaging portion provided at the tip end of the second holding leg, the ring portion abuts against the front surface of the plate, the first and second holding legs protrude through the mounting hole to the rear surface side of the plate, the flow rate adjusting portion penetrates through the mounting hole to the front surface side, the second body of the flow rate control valve is sandwiched between the first and second holding legs, and the first and second holding legs are connected to each other by the lock arm.

4. The flow control valve mounting structure according to claim 1, wherein:

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