Control valve

Abstract

To achieve downsizing of a control valve.SOLUTION: A control valve includes: a body block 11 formed with a primary side passage to which a fluid is supplied and a secondary side passage which discharges the fluid; a square cylinder 12 which is attached to the body block 11, incorporates a valve drive mechanism, and has a square end surface; a valve member disposed between the body block 11 and the cylinder 12; a fastening member 62 which fastens the body block 11 and the cylinder 12 to each other in a manner that a first flange provided at the body block 11 and a second flange provided at the cylinder 12 are sandwiched therebetween; and fixing pins 74 each of which is press-fitted into a mounting hole 71, which communicates with a communication hole 72 formed at the fastening member 62 and is formed at a corner part of the cylinder 12, and the communication hole 72.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a control valve including a main body block in which a primary flow path and a secondary flow path are formed, and a cylinder in which a valve drive mechanism is provided. [Background technology]

[0002] Fluid supply devices that supply fluid from a fluid pressure source to fluid pressure equipment, etc., use control valves to open and close flow paths and control pressure. Control valves used for such applications include a flow path block (i.e., a main body block) with a primary flow path and a secondary flow path, and a drive block (i.e., a cylinder) attached to the main body block. A primary piping that is connected to the fluid pressure source is connected to the primary flow path, and a secondary piping that supplies fluid to the fluid pressure equipment, etc., is connected to the secondary flow path. A valve member is provided between the main body block and the cylinder to open and close the communication between the primary flow path and the secondary flow path and to change the opening degree, and the valve member is driven by a valve drive mechanism provided in the cylinder.

[0003] As in the flow control valve described in Patent Document 1, the cylinder is usually attached to the main body block by a screw member and a plate located at the bottom end of the main body block. On the other hand, the control valve described in Patent Document 2 has a fastening block located on the bottom surface of the flow path block, and the drive block is attached to the flow path block by a pin attached to the fastening block. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-322275 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-31842 Summary of the Invention [Problem to be solved by the invention]

[0005] In the flow control valve described in Patent Document 1, if the cylinder has a rectangular cross-section and a circular cylinder bore formed therein, spaces are formed between the cylinder bore and the cylinder's outer surface at the four corners. A screw is attached to this space along the length of the cylinder, and the tip of the screw is threadedly coupled to a plate attached to the lower end of the main body block, thereby fastening the cylinder to the main body block with the screw. When the cylinder is attached to the main body block using the screw and plate, the head of the screw is larger in diameter than the threaded portion, and space for the head of the screw must be secured between the cylinder bore and the cylinder's outer surface. Furthermore, a plate or nut must be attached to the lower end of the cylinder body. Therefore, there is a limit to how compact the cylinder can be in a control valve in which the cylinder and main body block are fastened with the screw.

[0006] In the control valve described in Patent Document 2, the drive block is attached to the flow path block without using a screw member. However, in a configuration in which a fastening member is placed on the bottom surface of the flow path block and the drive block and flow path block are fixed together by a pin attached to the fastening member, it is difficult to create a manifold type in which multiple drive blocks are attached to a single flow path block.

[0007] When the drive block and the flow path block are each made of resin and fastened together with screw members, stress is applied to the entire portions of the drive block and the flow path block that receive the fastening force from the screw members. When stress is applied to resin members, creep occurs, whereby distortion increases over time. Therefore, when fastening force is applied to the resin drive block and the flow path block with screw members, distortion increases throughout the entire thickness portion where the fastening force is applied, weakening the tightening force of the screw members and potentially causing fluid leakage.

[0008] An object of the present invention is to achieve a compact control valve. [Means for solving the problem]

[0009] The control valve of the present invention comprises a main body block having a primary side flow path to which a fluid is supplied and a secondary side flow path to which the fluid is discharged, a cylinder attached to the main body block and incorporating a valve drive mechanism, a communication section connecting the primary side flow path and the secondary side flow path, a valve member arranged between the main body block and the cylinder and changing the communication opening of the communication section by the valve drive mechanism, a fastening member sandwiching a first flange provided on the main body block and a second flange provided on the cylinder to fasten the main body block and the cylinder, and a fixing pin communicating with a communication hole formed in the fastening member and press-fitted into the communication hole and an attachment hole formed in the cylinder.

[0010] The control valve of the present invention comprises a main body block having a primary side flow path to which a fluid is supplied and a secondary side flow path to which the fluid is discharged, a cylinder attached to the main body block and incorporating a valve drive mechanism, a communication section connecting the primary side flow path and the secondary side flow path, a valve member arranged between the main body block and the cylinder and changing the communication opening of the communication section by the valve drive mechanism, and a fastening member that fastens the main body block and the cylinder by sandwiching a first flange provided on the main body block and a second flange provided on the cylinder, and the fastening member has a plurality of fastening adapters that can be combined with each other by engagement between an engaging claw and an engaging section with which the engaging claw engages. [Effects of the Invention]

[0011] The cylinder is attached to the main body block by butting a first flange on the main body block against a second flange on the cylinder, and a fastening member is attached to the flanges by sandwiching the butted flanges. When a fixing pin is press-fitted into a mounting hole formed in a corner of the cylinder, the fastening member is fixed to the flange portion by the press-fitted fixing pin. The main body block and the cylinder are fastened together by the fastening member. Compared to fastening the main body block and the cylinder with a screw member provided in the corner of the cylinder, attaching a headless fixing pin to the corner of the cylinder allows for a smaller space in the corner, thereby enabling the control valve to be made smaller.

[0012] If the fastening member is formed of multiple fastening adapters that engage with each other, the fastening member can be attached to the flanges by sandwiching both flanges by combining the fastening adapters. Assembling the fastening members by engaging them makes the control valve easier to assemble while still being compact. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view showing the appearance of a control valve according to an embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. 3 is a right side view of FIG. 2. [Figure 4] FIG. 4 is an enlarged cross-sectional view taken along the line AA in FIG. [Figure 5] FIG. 5 is an enlarged cross-sectional view of a main part in FIG. 4. [Figure 6] FIG. 2 is an exploded perspective view of a valve drive mechanism incorporated in a cylinder. [Figure 7] FIG. 10 is a perspective view showing the upper end of the cylinder and a pin press-fitted into a mounting hole in the upper end. [Figure 8] FIG. 2 is an exploded perspective view showing a cylinder, a main body block, and a fastening member that fastens them together. [Figure 9] FIG. 2 is a front view showing a main body block of a manifold type control valve. [Figure 10] FIG. 10 is a front view of a control valve according to another embodiment. [Figure 11] 11A is a perspective view showing the upper end of the cylinder in FIG. 10, and FIG. 11B is a cross-sectional view taken along line BB in FIG. [Figure 12] FIG. 11 is an exploded view of the control valve shown in FIG. 10. [Figure 13] FIG. 10 is a front view of a control valve according to still another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 to 4, a control valve 10a includes a main body block 11 and a cylinder 12. The end faces of the main body block 11 and the cylinder 12 are rectangular in plan view, and the outer circumferential surfaces are formed by four flat surfaces. The main body block 11 is made of PFA (polytetrafluoroethylene resin), and the cylinder 12 is made of PPS (polyphenylene sulfide). A primary-side joint 13 protrudes from the front face 11a of the main body block 11, and a secondary-side joint 14 protrudes from the back face 11b, with both joints 13 and 14 being coaxial. In FIGS. 2 to 4, nuts 15 and 16 for fastening hoses or the like are shown screwed onto the respective joints 13 and 14; the nuts 15 and 16 are omitted in FIG. 1. Legs 17 and 18 protrude from the lower ends of the side faces 11c and 11d of the main body block 11. The material of the main body block 11 may be a fluororesin such as PTFE (polytetrafluoroethylene), other resins, or metal. The material of the cylinder 12 may be a resin other than PPS or a metal.

[0015] The control valve 10a can be placed on a base (not shown) with the legs 17, 18 on the lower side. However, the control valve 10a can also be configured without the legs 17, 18. In the specification, the vertical relationship of the control valve 10a is shown based on the state in which the legs 17, 18 are placed on the lower side.

[0016] As shown in Fig. 4, a primary-side flow path 21 is formed in the main body block 11, and has a main flow path 21a extending in the left-right direction of the main body block 11 in Fig. 4. The main flow path 21a communicates with a primary-side port 13a provided in the joint portion 13, and a primary-side piping connected to a liquid supply source such as a pump is connected to the primary-side port 13a. A secondary-side flow path 22 is formed in the main body block 11, and has a main flow path 22a extending in the left-right direction of the main body block 11 in Fig. 4. The main flow path 22a communicates with a secondary-side port 14a provided in the joint portion 14, and a secondary-side piping connected to a liquid discharger is connected to the secondary-side port 14a.

[0017] Main flow path 21a communicates with the surface of connecting portion 23 of main body block 11 via communicating flow path 21b, which extends perpendicular to main flow path 21a. Main flow path 22a communicates with the surface of connecting portion 23 of main body block 11 via communicating flow path 22b, which extends perpendicular to main flow path 22a and is parallel to communicating flow path 21b.

[0018] 5, the valve member 25 is a diaphragm valve and has a valve disc 26 that opens and closes the valve seat 24, which is a communication portion, an annular portion 27 arranged in the connecting portion 23, and an elastically deformable portion 28 between the valve disc 26 and the annular portion 27, and is made of fluororesin. The valve seat 24 provided in the connecting portion 23 and a communication chamber 29 formed between the valve member 25 and the main body block 11 constitute a communication portion that communicates between the primary side flow path 21 and the secondary side flow path 22, and the communication flow path 21b of the primary side flow path 21 opens to the surface of the connecting portion 23 at the valve seat 24. The valve member 25 is arranged on the surface of the connecting portion 23 of the main body block 11.

[0019] As shown in Figure 4, a cylinder bore 31 is formed in the cylinder 12, and the cylinder bore 31 has a circular cross section. A piston 32 is fitted inside the cylinder bore 31 so as to be able to move back and forth in a linear direction. A piston rod 33 attached to the piston 32 passes through a through-hole 35 formed in a connecting portion 34 at the lower end of the cylinder 12 and protrudes toward the main body block 11. A mounting hole 36 is formed in the protruding end of the piston rod 33, and a protrusion 37 of the valve body 26 is inserted into the mounting hole 36, attaching the valve body 26 to the piston rod 33.

[0020] A cover member 38 is attached to the open end of the cylinder bore 31. The cover member 38 has a cylindrical portion 38a and an end plate portion 38b provided at the end of the cylindrical portion 38a. A male thread 41 is formed on the cylindrical portion 38a, and the male thread 41 is threadedly coupled to a female thread 42 formed on the open end of the cylinder bore 31. As shown in FIG. 1 , an engagement hole 43 is formed on the outer surface of the end plate portion 38b of the cover member 38. By engaging a jig (not shown) with the engagement hole 43 and rotating the cover member 38, the cover member 38 can be threadedly coupled to the female thread 42 or the cover member 38 can be removed from the cylinder 12.

[0021] A spring chamber 45 is formed between a spring receiving member 44 arranged on the inner surface of the end plate portion 38b and the inner surface of the piston 32, and a spring member 46 made of a compression coil spring is arranged in the spring chamber 45. The spring member 46 applies a spring force to the valve body 26 via the piston 32 in a direction toward the valve seat portion 24, i.e., in a direction to close the flow path. When the spring member 46 is abutted against the spring receiving member 44 to screw the cover member 38 to the cylinder 12, the spring receiving member 44 slips against the inner surface of the end plate portion 38b, preventing the spring member 46 from twisting.

[0022] A fluid chamber 47 is formed between the piston 32 and the connecting portion 34 of the cylinder 12, and an operation port 48 communicating with this fluid chamber 47 is provided in an operation portion 49, which is provided on the front surface 12a of the cylinder 12. An air supply passage (not shown) is connected to the operation port 48, and compressed air from a compressed air supply source is supplied to the fluid chamber 47. When compressed air is supplied to the fluid chamber 47, the valve element 26 is driven in a direction away from the valve seat against the spring force of the spring member 46 and moves to a first position spaced apart from the valve seat portion 24, thereby opening the primary-side flow path 21 and the secondary-side flow path 22, i.e., establishing a communication state. When the compressed air in the fluid chamber 47 is discharged to the outside, the spring force of the spring member 46 moves the valve element 26 to a second position closer to the valve seat portion 24 than the first position, thereby closing the primary-side flow path 21 and the secondary-side flow path 22, i.e., establishing a communication state. In this way, the degree of communication opening of the communication part is changed by moving the valve body 26 constituting the valve member 25 closer or farther from the valve seat part 24 .

[0023] As shown in Figure 4, a seal member 51 is attached to the piston 32 to seal between the spring chamber 45 and the fluid chamber 47. Furthermore, a seal member 52 is attached between the piston rod 33 and the cylinder 12 to seal the fluid chamber 47. The piston 32, the spring member 46, etc. constitute a valve drive mechanism 50 for opening and closing the valve member 25, and the cylinder 12 and the valve drive mechanism 50 incorporated therein constitute an actuator for driving the valve member 25. The valve member 25 is moved up and down by the valve drive mechanism 50, thereby changing the degree of communication opening of the communication part. Figure 6 shows an exploded view of the piston 32, the spring member 46, etc. that constitute the valve drive mechanism 50, and the cylinder 12 that houses them.

[0024] A flange 53 is provided on the connecting portion 23 of the main body block 11, and is a first flange. As shown in FIG. 5 , if the linear reciprocating direction of the piston rod 33 is defined as the vertical direction, the flange 53 extends vertically, and has an abutting surface 54 on the upper surface and a fastening surface 55 on the lower surface at both end faces. The fastening surface 55 is an inclined surface that slopes upward from the inside to the outside in the radial direction. A flange 56 is provided on the connecting portion 34 of the cylinder 12 opposite the flange 53, and is a second flange. The flange 56 extends vertically, and has a fastening surface 57 on the upper surface and abutting surface 58 on the lower surface at both end faces. The fastening surface 57 is an inclined surface that slopes downward from the inside to the outside in the radial direction. When the cylinder 12 is assembled to the main body block 11, the abutting surface 54 of the flange 53 abuts against the abutting surface 58 of the flange 56.

[0025] A protrusion 59 is provided radially inward of the flange 53, and a recess 60 is formed between the protrusion 59 and the flange 53, and the outer peripheral fixing portion 27a of the annular portion 27 of the valve member 25 fits into the recess 60. A tightening ring 61 is disposed inside the flange 56, and the annular portion 27 of the valve member 25 is sandwiched between the protrusion 59 and the tightening ring 61.

[0026] The control valve 10a has a fastening member 62 that fastens the main body block 11 and the cylinder 12. The fastening member 62 consists of a first fastening adapter 62a and a second fastening adapter 62b. The fastening adapters 62a and 62b are made of metal or resin. As shown in FIG. 8, each fastening adapter 62a and 62b has a long piece 64a and short pieces 64b extending perpendicularly from both ends thereof. The outer surface is flat and the inner surface is arc-shaped. The inner surfaces of the fastening adapters 62a and 62b are formed with concave surfaces 65 that abut against the outer peripheral surfaces of the flanges 53 and 56. A first pressing portion 66 and a second pressing portion 67 are connected to the concave surface 65 and provided on both sides of each fastening adapter 62a and 62b. The pressing portion 66 has a fastening surface 68 that presses against the fastening surface 55 of the flange 53, and the pressing portion 67 has a fastening surface 69 that presses against the fastening surface 57 of the flange 56, and the fastening surfaces 68, 69 are formed on the inner surfaces of the fastening adapters 62a, 62b. The fastening surfaces 68, 69 are inclined surfaces that correspond to the fastening surfaces 55, 57. The fastening member 62 is composed of at least two fastening adapters.

[0027] As shown in Figure 1, mounting holes 71 are formed extending vertically at the four corners of cylinder 12, which has a rectangular end face in a plan view, and each mounting hole 71 passes through cylinder 12. Communication holes 72 are formed in fastening adapters 62a, 62b corresponding to the mounting holes 71, and a communication hole 73 is also formed in main body block 11. The longitudinal center of fixing pin 74 is press-fitted into communicating hole 72, the lower end of fixing pin 74 is press-fitted into communicating hole 73, and the upper end of fixing pin 74 is press-fitted into fixing hole 71. Fixing pin 74 is attached to cylinder 12 by utilizing the space between cylinder bore 31 and the outer surface of cylinder 12 at the four corners of cylinder 12, making it possible to reduce the size of cylinder 12 while maintaining the inner diameter of cylinder bore 31.

[0028] If a screw is used to fasten the cylinder 12 and the main body block 11, the head, which has a larger diameter than the main body of the screw, must be positioned between the cylinder bore 31 and the outer surface of the cylinder. When using a screw connection, the screw diameter must be sized to maintain sufficient strength for the connection, so there is a limit to how small the screw can be. Furthermore, to connect using a screw, it is necessary to combine it with a female thread, and to provide a female thread in a plastic member, the diameter of the female thread must be large so that the female thread maintains sufficient strength. When providing a female thread in a metal such as a nut or plate, the main body block 11 and the cylinder 12 must be fixed by sandwiching them between a nut or plate.

[0029] In contrast, when the cylinder 12 and the main body block 11 are fastened together using the fixing pin 74 without using a screw member, the fixing pin 74 only needs to hold the fastening adapters 62a, 62b so that they do not come off the control valve 10a, and a fixing pin 74 with a smaller diameter than when screws are used can be used for fastening. This allows the dimension between the cylinder bore 31 and the outer surface of the cylinder 12 to be reduced, thereby enabling the cylinder 12 to be made more compact. At least two communication holes 72 need only be formed in the fastening adapters 62a, 62b.

[0030] 1 and 8, the fastening adapter 62a has two adjacent communication holes 72 along the same outer surface of the control valve 10a, and the fastening adapter 62b has two other adjacent communication holes 72 along the same outer surface on the opposite side of the fastening adapter 62a. The fastening member 62 is separated into the two fastening adapters 62a, 62b, but the two fastening adapters 62a, 62b may be made of resin and connected to each other by a hinge member so that they can be opened and closed freely.

[0031] As shown in FIG. 1, the outer shape of the cylinder 12 is rectangular in plan view. However, if the outer shape of the cylinder 12 were instead pentagonal in plan view, the cylinder 12 would have five corners. In this case, the cylinder 12 and the main body block 11 could be fastened together using five fixing pins 74. As such, the end face shape or cross-sectional shape of the cylinder 12 constituting the control valve 10a is not limited to a rectangular shape, but can be a polygonal shape such as a triangle. Polygonal shapes also include shapes in which all or some of the corners are rounded or chamfered. Furthermore, the outer shape of the cylinder 12 in plan view is not limited to a rectangular shape, and may be a circle or a shape combining straight lines and curves, such as a D-cut.

[0032] 7 is a perspective view showing the upper end of the cylinder 12, and each fixing pin 74 is press-fitted from the upper opening of a mounting hole 71 formed in the cylinder 12. The fixing pin 74 is press-fitted in a state in which the fastening adapters 62a, 62b sandwich the flanges 53, 56, and the fastening surface 68 of the pressing portion 66 is pressed against the fastening surface 55 of the flange 53, and the fastening surface 69 of the pressing portion 67 is pressed against the fastening surface 57 of the flange 56.

[0033] The fixing pin 74 passes through the communicating holes 72 of the fastening adapters 62a, 62b, with its upper end supported in the mounting hole 71 and its lower end supported in the communicating hole 73. The fixing pin 74 may be supported at only either its upper end or its lower end. If the lower end of the fixing pin 74 is supported in the communicating hole 72, the main body block 11 does not need to be provided with the communicating hole 73. If the upper end of the fixing pin 74 is supported in the mounting hole 71 and the lower end is supported in the communicating hole 73, the fastening adapters 62a, 62b can be held more reliably than if only one of the upper end or the lower end is supported. In this case, if the fastening adapters 62a, 62b are made of a transparent or translucent resin, the presence or absence of the fixing pin 74 can be determined visually or by image recognition, preventing incorrect assembly.

[0034] The fastening adapters 62a, 62b, fixed by the fixing pins 74, press against the entire outer circumferential surfaces of the flanges 53, 56. Even if the body block 11 and the cylinder 12 are made of fluororesin, which is prone to deformation due to creep, the flanges 53, 56 are enveloped and covered by the fastening adapters 62a, 62b, so that the seating force holding the valve member 25 is maintained for a long period of time, even if creep occurs. Furthermore, although the annular portion 27 of the valve member 25 receives a tightening force from the flanges 53, 56, the thin outer circumferential fixing portion 27a causes almost no decrease in elastic force due to creep caused by changes over time or temperature. As a result, even if the body block 11 and the cylinder 12 are made of fluororesin, which is prone to deformation due to creep, deformation of the valve member 25 does not occur, and the durability of the control valve 10a can be improved.

[0035] As shown in Figure 4, a breather hole 75 communicating with the spring chamber 45 is provided in the cylinder 12, and when the piston 32 reciprocates, outside air flows into the spring chamber 45 and internal air is exhausted from the spring chamber 45 through the breather hole 75. Furthermore, breather holes 76 are formed in the fastening adapters 62a, 62b, and the breather holes 76 communicate with the space formed between the valve member 25 and the connecting portion 34 of the cylinder 12. To communicate this space with the breather hole 76, a plurality of breather grooves 77 are formed radially in the tightening ring 61, and a breather groove 78 is also formed between the abutment surface 54 of the flange 53 and the abutment surface 58 of the flange 56.

[0036] To assemble the control valve 10a, the components constituting the valve drive mechanism 50 are installed inside the cylinder 12, as shown in FIG. 6. The cylinder 12 with the valve drive mechanism 50 installed is then transported to the main body block 11, as shown by the arrow in FIG. 8, and the flange 53 of the main body block 11 is butted against the flange 56 of the cylinder 12. In this state, two fastening adapters 62a, 62b are attached to the flanges 53, 56, sandwiching them between them. The fastening adapters 62a, 62b are pressed against the flanges 53, 56 to bring them closer together, aligning the communication hole 72 with the mounting hole 71 and the communication hole 73. This applies a fastening force to the two flanges 53, 56 in a direction that brings them closer together. In this state, the fixing pin 74 is press-fitted through the mounting hole 71, and the fastening member 62 is fastened to the main body block 11 and the cylinder 12 by the fixing pin 74. In this way, the control valve 10a is assembled.

[0037] FIG. 9 is a front view of the main body block of the manifold-type control valve 10b. This main body block 80 has a rectangular parallelepiped shape. A coupling portion 13, which has a primary port formed therein, protrudes from the front surface 80a of the main body block 80. A nut 15 is attached to the coupling portion 13. A primary flow path 21, which communicates with the primary port of the coupling portion 13, is formed in the main body block 80 in the longitudinal direction. Three coupling portions (not shown), each having a secondary port formed therein, protrude from the side surface 80b of the main body block 80. Each coupling portion has a secondary flow path communicating with the secondary port. A nut 16 is attached to each coupling portion. Three flanges 53 protrude from the top surface of the main body block 80. The flanges 56 of the cylinders 12 shown in FIG. 4 abut against each flange 53. Valve members 25 are respectively disposed between the main body block 80 and the three cylinders 12. This results in a manifold-type control valve 10b including a main body block 80 having a common primary flow path and multiple secondary flow paths. Note that the main body block 80 may also have multiple primary flow paths and a common secondary flow path.

[0038] In this way, even in a manifold-type control valve having a plurality of at least either primary flow paths or secondary flow paths and having a plurality of cylinders 12 attached to a single main body block 80, the plurality of cylinders 12 can be attached to the main body block 80 using the fixing pins 74. A manifold-type control valve 10b equipped with a plurality of compact cylinders 12 is obtained.

[0039] Figure 10 is a front view of a control valve 10c according to another embodiment. Figure 11(A) is a perspective view showing the upper end of the cylinder of Figure 10, and Figure 11(B) is a cross-sectional view taken along line BB in Figure 10. Figure 12 is an exploded view of the control valve 10c. In these figures, components common to the control valve 10c described above are designated by the same reference numerals.

[0040] In the control valve 10c, the piston 32 incorporated inside the cylinder 12, the flow passage formed in the main body block 11, and the valve member 25 attached to the piston rod 33 are the same as those of the control valve 10a shown in Fig. 4. As shown in Fig. 10, the operating part 49 extends to the upper end of the cylinder 12, and a breather hole 75 is opened in the operating part 49 adjacent to the operating port 48. Note that the operating part 49 in the control valve 10a may also be extended to the upper end surface of the cylinder 12, similar to the control valve 10c.

[0041] In the control valve 10a described above, the fastening member 62 that fastens the main body block 11 and the cylinder 12 is of a pin-fixed type, in which the fastening member 62 is fixed to the main body block 11 and the cylinder 12 by a fixing pin 74, whereas in the control valve 10c, the fastening member 62 is formed by engaging and assembling multiple fastening adapters. Because the fixing pin 74 is not used, no mounting hole 71 is formed in the upper end surface of the cylinder 12, as shown in Figure 11(A).

[0042] The fastening member 62 shown in Fig. 12 is assembled by combining a first fastening adapter 62a and a second fastening adapter 62b. Fig. 11(B) shows the abutment surface 54 of the flange 53 of the main body block 11, and flat surfaces 81 and 82 are provided on the outer circumferential surface of the flange 53, and are parallel to each other. The flat surface 81 is parallel to the side surface 11c of the main body block 11, and the flat surface 82 is parallel to the opposite side surface 11d. The length of the flat surfaces 81 and 82 in the left-right direction in Fig. 11(B) is slightly longer than one-third the diameter of the flange 53.

[0043] 12 , a flat surface 81 is provided on the flange 56 of the cylinder 12 in correspondence with the flat surface 81 of the flange 53. Furthermore, a similar flat surface is provided on the flange 56 of the cylinder 12 in correspondence with the flat surface 82 of the flange 53. When the flanges 53 and 56 are butted together, the flat surface 81 of the flange 53 and the flat surface 81 of the flange 56 are adjacent to each other. Similarly, the flat surface 82 of the flange 53 and the flat surface of the flange 56 are adjacent to each other.

[0044] The outer peripheral surface of each flange 53, 56 has a convex arcuate surface 83 on the front side of the main body block 11 and a convex arcuate surface 84 on the back side. The arcuate surfaces 83, 84 have the same circumferential length. Figure 12 shows a portion of each of the arcuate surfaces 83, 84. As such, the outer peripheral surface of each flange 53, 56 is composed of two flat surfaces 81, 82 and two arcuate surfaces 83, 84.

[0045] As shown in Figure 12, both fastening adapters 62a, 62b have the same shape and include fastening pieces 85 that fasten the flanges 53, 56. The fastening pieces 85 are provided with grooves 86 into which the flanges 53, 56 fit, with bottom surfaces 86a of the grooves 86 facing the arcuate surfaces 83, 84 of the flanges 53, 56. An engaging claw 87 is provided at one end of the fastening piece 85, and the engaging claw 87 extends in a direction perpendicular to the fastening piece 85. A groove-shaped engaging portion 88 is provided at the other end of the fastening piece 85. A protrusion 87a is provided at the tip of the engaging claw 87, and the engaging portion 88 is formed by a groove portion 88a into which the tip of the engaging claw 87 fits and an engaging portion 88b with which the protrusion 87a engages.

[0046] The engagement claw 87 of the first fastening adapter 62a is the first engagement claw, and the engagement portion 88 is the first engagement portion, and the engagement claw 87 of the second fastening adapter 62b is the second engagement claw, and the engagement portion 88 is the second engagement portion. When the first engagement claw 87 shown in FIG. 12 is engaged with the second engagement portion 88 and the second engagement claw 87 is engaged with the first engagement portion 88, the two fastening adapters 62a and 62b are combined with each other as shown in FIG. 11(B). The arc surface 83 fits into the recessed groove 86 of the first fastening adapter 62a, and the arc surface 84 fits into the recessed groove 86 of the second fastening adapter 62b. Furthermore, the engagement claw 87 of the first fastening adapter 62a contacts the flat surface 81, and the engagement claw 87 of the second fastening adapter 62b contacts the flat surface 82. As a result, an engagement type fastening member 62 consisting of two fastening adapters 62a, 62b is assembled, and the main body block 11 and the cylinder 12 are fastened together.

[0047] As shown in FIG. 12, a fastening surface 55 consisting of an inclined surface is formed on flange 53, and a fastening surface 57 consisting of an inclined surface is formed on flange 56. Similar to fastening adapters 62a and 62b shown in FIG. 4, a fastening force is applied to both flanges 53 and 56 by fastening member 62.

[0048] Although the control valve 10c is formed by two fastening adapters 62a and 62b, the fastening member 62 may be formed by three or more fastening adapters.

[0049] FIG. 13 is a front view of a control valve 10d according to yet another embodiment. In this control valve 10d, the shape of the engaging portion 88 with which the tip of the engaging claw 87 engages differs from that of the control valve 10c. The engaging portion 88 is a bottomed hole that accommodates the engaging claw 87, and the engaging claw 87 is inserted through an insertion hole 88c. This gives the control valve 10d a more aesthetically pleasing appearance than the control valve 10c. Furthermore, when the engaging claw 87 is inserted through the insertion hole 88c, the tip of the engaging claw 87 enters the groove 88a, and the protrusion 87a engages with the engaging portion 88b, the engaging claw 87 engages with the engaging portion 88. The bottomed hole shape of the engaging portion 88 prevents the engaging claw 87 from being operated from the outside, preventing the engaging claw 87 from being disengaged from the engaging portion 88 due to incorrect operation. The two fastening adapters 62a, 62b in this control valve 10d have the same shape.

[0050] As described above, the two fastening adapters 62a, 62b of the control valves 10c, 10d have the same shape. However, it is also possible to provide engaging claws 87 at both ends of the fastening piece of one fastening adapter and engaging portions 88 at both ends of the fastening piece of the other fastening adapter. In this case, however, the shapes of the two fastening adapters are different, resulting in a larger number of parts. Therefore, as shown in Figures 12 and 13, making the two fastening adapters 62a, 62b the same shape facilitates assembly of the fastening member 62 and parts management. Furthermore, if the fastening member 62 has an engaging assembly structure as in the control valves 10c, 10d, the fixing pin 74 used in the control valve 10a described above is not necessary.

[0051] The present invention is not limited to the above-described embodiment and can be modified in various ways without departing from the spirit and scope of the present invention. For example, the control valve shown in the figure is an on-off valve that connects the primary flow path and the secondary flow path when the valve member 25 is in the first position and blocks the connection when the valve member 25 is in the second position. Other control valves that can be used include a control valve that controls the flow rate and pressure of fluid flowing from the primary flow path to the secondary flow path by changing the valve element aperture when the valve member 25 is in the first position and the second position, and a suck-back valve that changes the communication aperture and the volume of the communication chamber 29 by moving the valve member 25 up and down. The difference between these control valves and on-off valves is that the primary flow path and the secondary flow path are connected even when the valve member 25 is in the second position. Although the valve member 25 is a diaphragm valve, a poppet-type valve may be provided on the piston rod 33. Furthermore, the main body block 80 only needs to have multiple flanges 53, and may have multiple primary side flow paths and multiple secondary side flow paths, or may have one primary side flow path and one secondary side flow path. [Explanation of symbols]

[0052] 11 Body block 12 cylinders 21 Primary flow path 22 Secondary flow path 25 Valve member 26 Valve body 27 Circular section 27a Outer fixed part 28 Elastic deformation part 31 Cylinder hole 32 piston 33 Piston rod 34 Connecting part 38 Lid member 43 Communication hole 44 Spring support member 46 Spring member 48 Operation Port 50 Valve drive mechanism 53 Flange (first flange) 55 Fastening surface 56 Flange (second flange) 57 Fastening surface 61 Clamping ring 62 Fastening members 62a First fastening adapter 62b Second fastening adapter 66 First pressing portion 67 Second pressing part 68, 69 Fastening surface 71 Mounting hole 72, 73 communication hole 74 Fixing pin 81, 82 flat surface 83, 84 Arc surface 87 Engagement claw 88 Engagement part

Claims

1. a main body block having a primary flow path to which a fluid is supplied and a secondary flow path to which the fluid is discharged; a cylinder attached to the main body block and incorporating a valve drive mechanism capable of linear reciprocating motion; a communication portion that communicates the primary flow path and the secondary flow path; a valve member disposed between the main body block and the cylinder, the valve member changing the degree of communication opening of the communication portion by the valve drive mechanism; a fastening member that fastens the main body block and the cylinder by sandwiching a first flange provided on the main body block and a second flange provided on the cylinder; a fixing pin that communicates with a communication hole formed in the fastening member and is press-fitted into an attachment hole formed in the cylinder and the communication hole; and the main body block and the cylinder are arranged along the direction in which the valve drive mechanism linearly reciprocates, The communication hole and the mounting hole extend in a direction in which the valve drive mechanism linearly reciprocates.

2. 2. The control valve according to claim 1, The end face of the cylinder is polygonal; The mounting hole is formed in a corner of the cylinder.

3. 3. The control valve according to claim 1 or 2, The fastening member has at least two fastening adapters; The fastening adapter has at least two of the communication holes.

4. 2. The control valve according to claim 1, The end surface of the cylinder is rectangular, and the mounting holes are formed at the four corners of the cylinder, The fastening member has a first fastening adapter in which two adjacent communication holes are formed along the same outer surface, and a second fastening adapter in which other two communication holes are formed.

5. In the control valve according to claim 1, a second communication hole is formed in the main body block, the second communication hole being in communication with the communication hole formed in the fastening member and extending in the direction in which the valve drive mechanism linearly reciprocates; The fixing pin is press-fitted into the mounting hole, the communication hole, and the second communication hole.

6. The control valve according to any one of claims 1 to 5, The fastening member has a first pressing portion provided with an inclined surface that presses the inclined surface of the first flange, and a second pressing portion provided with an inclined surface that presses the inclined surface of the second flange, and when the fastening member clamps the first flange and the second flange, it applies a fastening force in a direction that brings the first flange and the second flange closer together.

7. The control valve according to any one of claims 1 to 6, The cylinder has a cylinder hole in which a piston is movably mounted, The valve member is a diaphragm valve having an annular portion sandwiched between the main body block and the cylinder, a valve body attached to a piston rod of the piston and opening and closing the communicating portion, and an elastically deformable portion between the annular portion and the valve body.

8. The control valve according to any one of claims 1 to 7, The main body block has a plurality of at least either the primary side flow paths or the secondary side flow paths, and is formed into a manifold type control valve having a plurality of the cylinders attached to a plurality of the first flanges provided on the main body block, respectively.

9. 8. The control valve according to claim 7, The main body block has a plurality of at least one of the primary flow passages and the secondary flow passages.

10. The control valve according to any one of claims 1 to 9, The valve member changes the degree of communication opening of the valve seat between a position where the communication portion is opened and a position where the communication portion is closed.

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