TW202414140A - Pressure reducing valve - Google Patents

Abstract

The pressure reducing valve includes a spring support member for receiving a pressure reducing spring, a screw-in adjustment member for adjusting the position of the spring support member, and a fixing member for fixing the screw-in adjustment member. The screw-in adjustment member includes an external threaded portion that is screwed into an internal threaded hole provided in a main body and abuts against the spring support member, an end wall, and a peripheral wall having an internal threaded hole formed on the inner peripheral surface. The external threaded portion protrudes from the end wall, and a plurality of insertion holes are formed around the external threaded portion. The fixing member includes a connecting member and a fixing nut, wherein the connecting member has a plurality of protrusions that can be inserted through the insertion hole and protrude from the end wall to abut against the main body, and the fixing nut is engaged with the connecting member while being allowed to rotate on the connecting member, and is screwed with the internal thread hole on the inner side of the peripheral wall. The fixing nut has an operating end surface exposed to the outside, and a groove is formed on the operating end surface for inserting a tool.

Description

Pressure Reducing Valve

The present disclosure relates to a pressure reducing valve.

The pressure reducing valve reduces the pressure of the fluid supplied from the primary flow path and guides it to the secondary flow path. The pressure reducing valve has a main body. The main body has a primary flow path, a secondary flow path, and a pressure reducing valve hole. The pressure reducing valve hole connects the primary flow path with the secondary flow path. The pressure reducing valve has a pressure reducing valve body, a pressure reducing piston, a pressure reducing spring, and a spring support member. The pressure reducing valve body opens and closes the pressure reducing valve hole. The pressure reducing piston can move back and forth in a manner that is integrated with the pressure reducing valve body. The pressure relief piston moves the pressure relief valve body in the closing direction by receiving the pressure of the secondary flow path. The pressure relief spring biases the pressure relief piston in the opening direction of the pressure relief valve body. The spring support member receives the pressure relief spring on the opposite side of the pressure relief piston in the moving direction of the pressure relief piston. An internal threaded hole is provided in the main body.

The pressure reducing valve is equipped with a threaded adjustment member and a fixed member. The threaded adjustment member has an external threaded portion. The external threaded portion is threaded with the internal threaded hole. The external threaded portion is in contact with the spring support member. The threaded adjustment member is screwed in and out of the internal threaded hole by the external threaded portion to adjust the position of the spring support member, thereby adjusting the spring force of the pressure reducing spring. Specifically, the spring force of the pressure reducing spring is adjusted so that the pressure reducing valve body is in a closed valve state when the pressure of the secondary side flow path reaches the set pressure. When the adjustment of the spring force of the pressure reducing spring is completed, the threaded adjustment member is fixed to the main body by the fixed member. In this way, the pressure reducing valve reduces the pressure of the fluid supplied from the primary flow path and directs it to the secondary flow path.

FIG6 shows a portion of a pressure reducing valve 100 of, for example, Japanese Patent Publication No. 9-179634. As shown in FIG6, a threaded adjustment member 101 protrudes outward from a main body 102. By performing a tightening operation of a nut 103, that is, screwing the nut 103 as a fixing member into the threaded adjustment member 101 until it abuts against the main body 102, the threaded adjustment member 101 is fixed to the main body 102 through the nut 103.

Problems to be solved by the invention In the above-mentioned publication, the screw-in adjustment member 101 protrudes from the end face 103a of the nut 103. Therefore, when tightening the nut 103, it is necessary to tighten the nut 103 in a direction intersecting with the direction of screwing in and out of the internal threaded hole 104 in the screw-in adjustment member 101 using a tool such as a wrench. Therefore, if sufficient working space cannot be ensured in the direction intersecting with the direction of screwing in and out of the internal threaded hole 104 in the screw-in adjustment member 101, the tightening operation of the nut 103 may be difficult. As a result, it is difficult to fix the screw-in adjustment member 101 on the main body 102, so the workability is reduced.

Furthermore, when the nut 103 is tightened, if the threaded adjustment member 101 rotates together with the nut 103, the threaded adjustment member 101 will be displaced. In this way, since the elastic force of the pressure reducing spring 105 will change, the pressure of the secondary side flow path cannot be accurately adjusted to the set pressure. Therefore, when the nut 103 is tightened, in order to prevent the threaded adjustment member 101 from rotating together with the nut 103, it is necessary to hold the threaded adjustment member 101, for example, with a tool or by hand. However, in the structure in which the threaded adjustment member 101 protrudes from the end face 103a of the nut 103, it is difficult to tighten the nut 103 while holding the portion of the threaded adjustment member 101 protruding outward from the end face 103a of the nut 103 with a tool or by hand. Therefore, it is currently desired to easily fix the screw-in adjustment member 101 on the main body 102 and to prevent the screw-in adjustment member 101 from being easily displaced, thereby improving workability and accurately adjusting the pressure of the secondary side flow path to the set pressure.

Means used to solve the problem A pressure reducing valve of a type disclosed in the present invention comprises a main body, a pressure reducing valve body, a pressure reducing piston, a pressure reducing spring, a spring supporting member, an internal threaded hole, a threaded adjusting member, and a fixing member; the main body comprises a primary flow path, a secondary flow path, and a pressure reducing valve hole connecting the primary flow path with the secondary flow path; the pressure reducing valve body switches the pressure reducing valve hole; the pressure reducing piston can move back and forth in a manner of being integrated with the pressure reducing valve body, and by bearing the pressure of the secondary flow path, the pressure reducing valve body moves in a valve closing direction; the pressure reducing spring The pressure reducing piston will be compressed in the opening direction of the pressure reducing valve body; the spring supporting member will bear the pressure reducing spring on the side opposite to the pressure reducing piston in the moving direction of the pressure reducing piston; the internal threaded hole is arranged in the main body; the threaded adjustment member will adjust the position of the spring supporting member, thereby adjusting the spring force of the pressure reducing spring; the fixing member will fix the threaded adjustment member on the main body; the pressure reducing valve will reduce the pressure of the fluid supplied from the primary side flow path and guide it to the secondary side flow path. The screw-in adjustment member has an external threaded portion, which is screwed into the internal threaded hole and abuts against the spring support member. The position of the spring support member is adjusted by screwing the external threaded portion into and out of the internal threaded hole. The screw-in adjustment member further has an end wall and a peripheral wall extending in a cylindrical shape from the outer peripheral portion of the end wall; the inner peripheral surface of the peripheral wall is formed with an internal threaded hole. The external threaded portion is columnar and protrudes from the central portion of the surface of the end wall on the side opposite to the peripheral wall. A plurality of insertion holes are formed around the external threaded portion in the end wall. The fixing member includes a connecting member and a fixing nut; the connecting member has a plurality of protrusions, which can be inserted through the insertion hole and protrude from the end wall to abut against the main body; the fixing nut is engaged with the connecting member while being allowed to rotate on the connecting member, and is screwed with the internal threaded hole on the inner side of the peripheral wall. The fixing nut has an operating end surface exposed to the outside when viewed from the direction facing the opening of the peripheral wall, and the operating end surface is formed with a groove for inserting a tool, and the tool is used to screw the fixing nut in and out of the internal threaded hole.

Effect of the invention According to this invention, workability can be improved and the pressure of the secondary flow path can be accurately adjusted to the set pressure.

An embodiment of a pressure reducing valve is described below with reference to FIGS. 1 to 5. The pressure reducing valve of this embodiment is used to adjust the pressure of a fluid output from an electromagnetic valve. The electromagnetic valve forms an electromagnetic valve manifold.

<Overall structure of electromagnetic valve manifold 10> As shown in FIG. 1 and FIG. 2, the electromagnetic valve manifold 10 has a plurality of electromagnetic valves 11, a plurality of manifold bases 30, a plurality of spacers 40, and a plurality of pressure reducing valves 50. The electromagnetic valves 11 are arranged in parallel in a single direction. The spacer 40 is sandwiched between the manifold base 30 and the electromagnetic valve 11. The manifold base 30, the spacer 40, and the pressure reducing valve 50 are arranged side by side in the parallel direction of the electromagnetic valve 11 corresponding to the electromagnetic valve 11. Therefore, the parallel direction of the manifold base 30, the spacer 40, and the pressure reducing valve 50 is consistent with the parallel direction of the electromagnetic valve 11.

<Solenoid valve 11> As shown in FIG. 1 , each solenoid valve 11 has a valve housing 12. The valve housing 12 is in the shape of a rectangular block. The valve housing 12 has a housing body 13, a first connecting block 14, and a second connecting block 15. The housing body 13 is in the shape of a rectangular block. The first connecting block 14 is connected to the first end of the housing body 13 in the long side direction. The second connecting block 15 is connected to the second end of the housing body 13 in the long side direction. The housing body 13 has a main body facing surface 13a, which faces the spacer 40.

The valve housing 12 has a valve hole 16. The valve hole 16 is formed in the housing body 13. The valve hole 16 is a circular hole. The valve hole 16 extends in the long side direction of the housing body 13. The first end of the valve hole 16 opens toward the first end face of the housing body 13 in the long side direction. The second end of the valve hole 16 opens toward the second end face of the housing body 13 in the long side direction. Therefore, the valve hole 16 passes through the housing body 13 in the long side direction.

Each solenoid valve 11 has a spool valve 17. The spool valve 17 is accommodated in the valve hole 16. The spool valve 17 is accommodated in the valve hole 16 in a state where the axial direction of the spool valve 17 coincides with the axial direction of the valve hole 16. The spool valve 17 is accommodated in the valve hole 16 so as to be movable back and forth.

Each solenoid valve 11 has a supply port P, a first output port A, a second output port B, a first discharge port R1, and a second discharge port R2. Therefore, each solenoid valve 11 of the present embodiment is a 5-port solenoid valve. The supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 are formed on the housing body 13. The supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 are respectively connected to the valve hole 16.

Arranged in order from the first end toward the second end in the long side direction of the shell body 13 are: the first discharge port R1, the first output port A, the supply port P, the second output port B, and the second discharge port R2. The first ends of the supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 are connected to the valve hole 16. The second ends of the supply port P, the first output port A, the second output port B, the first discharge port R1, and the second discharge port R2 are open toward the main body facing surface 13a of the shell body 13.

Each electromagnetic valve 11 has a first piston 18 and a second piston 19. The first piston 18 is in the shape of a disk. The first piston 18 is connected to the first end of the spool valve 17. The first piston 18 moves in a manner integral with the spool valve 17. The second piston 19 is in the shape of a disk. The second piston 19 is connected to the second end of the spool valve 17. The second piston 19 moves in a manner integral with the spool valve 17.

The first connecting block 14 is formed with a first piston receiving recess 20 in the shape of a circular hole. The first piston receiving recess 20 receives the first piston 18 which can move back and forth. The first piston receiving recess 20 and the first piston 18 define a first pilot pressure action chamber 21. The pilot fluid is supplied and discharged in the first pilot pressure action chamber 21.

The second connecting block 15 is formed with a second piston receiving recess 22 in the shape of a circular hole. The second piston receiving recess 22 receives the second piston 19 which can move back and forth. The second piston receiving recess 22 and the second piston 19 define a second pilot pressure action chamber 23. The pilot fluid is supplied and discharged in the second pilot pressure action chamber 23.

Each solenoid valve 11 includes a first pilot valve V1 and a second pilot valve V2. Therefore, the solenoid valve 11 is a double solenoid type pilot type solenoid valve. The voltage is applied to the first pilot valve V1 and the second pilot valve V2 by an external control device such as a programmable logic controller (PLC) not shown.

The spool valve 17 can be switched between the first position and the second position. For example, it is set to apply voltage to the first pilot valve V1, and stop applying voltage to the second pilot valve V2. Then, through the first pilot valve V1, the compressed fluid from the unillustrated fluid supply source is supplied to the first pilot pressure chamber 21 as a pilot fluid. On the other hand, through the second pilot valve V2, the pilot fluid in the second pilot pressure chamber 23 is discharged to the atmosphere. In this way, the spool valve 17 moves toward the second piston accommodating recess 22. As a result, the spool valve 17 switches to the first position, so that the supply port P is connected to the first output port A, and the second output port B is connected to the second discharge port R2. When the spool valve 17 is switched to the first position, the connection between the supply port P and the second output port B is blocked, and the connection between the first output port A and the first discharge port R1 is also blocked.

In addition, for example, it is set to stop applying voltage to the first pilot valve V1 and simultaneously apply voltage to the second pilot valve V2. Then, the compressed fluid from the fluid supply source is supplied to the second pilot pressure action chamber 23 as the pilot fluid through the second pilot valve V2. On the other hand, the pilot fluid in the first pilot pressure action chamber 21 is discharged to the atmosphere through the first pilot valve V1. In this way, the spool valve 17 moves toward the first piston accommodating recess 20. As a result, the spool valve 17 switches to the second position, so that the supply port P is connected to the second output port B, and the first output port A is connected to the first discharge port R1. When the spool valve 17 is switched to the second position, the connection between the supply port P and the first output port A is blocked, and the connection between the second output port B and the second discharge port R2 is also blocked.

Therefore, the first pilot valve V1 supplies and discharges the pilot fluid to the first pilot pressure chamber 21, and the second pilot valve V2 supplies and discharges the pilot fluid to the second pilot pressure chamber 23, so that the spool valve 17 moves back and forth between the first position and the second position in the valve hole 16. By switching the spool valve 17 between the first position and the second position, the connection between the ports can be switched. FIG. 1 shows the state where the spool valve 17 is located at the second position.

<Manifold base 30> Each manifold base 30 is in the shape of a long square block. Each manifold base 30 has a mounting surface 30a. The mounting surface 30a mounts the solenoid valve 11 through the spacer 40. The long side direction of each manifold base 30 is consistent with the long side direction of the valve housing 12.

Each manifold base 30 has a supply flow path 31 , a first output flow path 32 , a second output flow path 33 , a first discharge flow path 34 , and a second discharge flow path 35 . The supply flow path 31 , the first output flow path 32 , the second output flow path 33 , the first discharge flow path 34 , and the second discharge flow path 35 are all open toward the mounting surface 30 a .

The end of the supply flow path 31 on the side opposite to the mounting surface 30a is connected to a fluid supply source (not shown) through, for example, piping. The end of the first output flow path 32 on the side opposite to the mounting surface 30a and the end of the second output flow path 33 on the side opposite to the mounting surface 30a are connected to a fluid pressure machine (not shown) through, for example, piping. The end of the first discharge flow path 34 on the side opposite to the mounting surface 30a and the end of the second discharge flow path 35 on the side opposite to the mounting surface 30a are connected to the atmosphere.

<Spacers 40> Each spacer 40 is in the shape of a long square block. Each spacer 40 has a first facing surface 40a facing the valve housing 12 and a second facing surface 40b facing the manifold base 30. The long side direction of each spacer 40 is consistent with the long side direction of the valve housing 12.

Each spacer 40 has a mounting surface 41. The mounting surface 41 is an end surface located at one end in the longitudinal direction of the spacer 40. Each spacer has a first supply communication flow path 42, a second supply communication flow path 43, a first output communication flow path 44, a second output communication flow path 45, a first discharge communication flow path 46, and a second discharge communication flow path 47.

In the first supply communication flow path 42, the first end is connected to the supply flow path 31, and the second end is open to the mounting surface 41. In the second supply communication flow path 43, the first end is connected to the supply port P, and the second end is open to the mounting surface 41. The opening position of the second supply communication flow path 43 in the mounting surface 41 is closer to the first opposing surface 40a than the opening position of the first supply communication flow path 42 in the mounting surface 41.

The first output communication channel 44 connects the first output channel 32 and the first output port A. The second output communication channel 45 connects the second output channel 33 and the second output port B. The first discharge communication channel 46 connects the first discharge channel 34 and the first discharge port R1. The second discharge communication channel 47 connects the second discharge channel 35 and the second discharge port R2.

The solenoid valve manifold 10 includes a first sealing member 48 and a second sealing member 49. The first sealing member 48 seals between the spacer 40 and the manifold base 30. The first sealing member 48 is, for example, a thin plate-shaped gasket. The second sealing member 49 seals between the spacer 40 and the valve housing 12. The second sealing member 49 is, for example, a thin plate-shaped gasket.

<Pressure reducing valve 50> Each pressure reducing valve 50 has a main body 51. The main body 51 has a main body 52. The main body 52 is in the shape of a rectangular block. The main body 52 has a first surface 52a, a second surface 52b, and a connecting surface 52c. The first surface 52a is a surface located at one end of the main body 52 in the longitudinal direction. The second surface 52b is a surface located at the other end of the main body 52 in the longitudinal direction. The connecting surface 52c is a surface that connects the first surface 52a and the second surface 52b and extends in the longitudinal direction and the width direction of the main body 52.

Each main body 51 is mounted on each spacer 40. Specifically, each main body 51 is mounted on the mounting surface 41 of each spacer 40 in a state where the first surface 52a of the main body 52 faces the mounting surface 41 of each spacer 40. As shown in FIG2 , a plurality of manifold bases 30, a plurality of spacers 40, and a plurality of pressure reducing valves 50 are arranged side by side in the parallel direction of the electromagnetic valves 11, respectively corresponding to a plurality of parallel electromagnetic valves 11. The width direction of each main body 52 is consistent with the parallel direction of the electromagnetic valves 11. The width direction of each main body 52 in FIG2 is indicated by an arrow X1.

As shown in FIG1 , the main body 51 has a primary flow path 53, a secondary flow path 54, and a pressure reducing valve hole 55. The primary flow path 53 and the secondary flow path 54 respectively penetrate the main body 52 in the long side direction. The primary flow path 53 and the secondary flow path 54 respectively open to the first surface 52a and the second surface 52b. The secondary flow path 54 is located closer to the connecting surface 52c than the primary flow path 53. The primary flow path 53 is connected to the first supply communication flow path 42. The secondary flow path 54 is connected to the second supply communication flow path 43. The end portion of the primary flow path 53 on the side opposite to the first supply communication flow path 42 and the end portion of the secondary flow path 54 on the side opposite to the second supply communication flow path 43 are respectively closed by a closing member 56. The closing member 56 constitutes a part of the main body 51.

As shown in FIG3 , a pressure reducing valve hole 55 is formed in the main body 52 . The pressure reducing valve hole 55 connects the primary flow path 53 and the secondary flow path 54 . The main body 52 has a valve seat 57 . The valve seat 57 is formed in the main body 52 around a portion of the pressure reducing valve hole 55 that opens to the primary flow path 53 .

The pressure reducing valve 50 includes a pressure reducing valve body 58. The pressure reducing valve body 58 opens and closes the pressure reducing valve hole 55. The pressure reducing valve body 58 is disposed in the primary flow path 53. The pressure reducing valve body 58 moves back and forth in the direction of contacting and separating from the valve seat 57. The pressure reducing valve body 58 is formed by integrating a metal spring bearing with rubber lining. The pressure reducing valve body 58 is housed in the main body 52 through a hole 59 opened on the surface of the main body 52 on the side opposite to the connecting surface 52c. The hole 59 is sealed by a plug 60.

The pressure reducing valve body 58 is in an open state when it leaves the valve seat 57. When the pressure reducing valve body 58 is in an open state, the communication between the primary flow path 53 and the secondary flow path 54 through the pressure reducing valve hole 55 is allowed. On the other hand, when the pressure reducing valve body 58 is seated in the valve seat 57, it is in a closed state. When the pressure reducing valve body 58 is in a closed state, the communication between the primary flow path 53 and the secondary flow path 54 through the pressure reducing valve hole 55 is blocked.

The pressure reducing valve 50 has a return spring 61. The return spring 61 is sandwiched between the pressure reducing valve body 58 and the plug 60. The return spring 61 will bias the pressure reducing valve body 58 toward the valve seat 57. Therefore, the return spring 61 will bias the pressure reducing valve body 58 to move the pressure reducing valve body 58 in the closing direction.

The main body 52 has a piston receiving hole 62. A first end of the piston receiving hole 62 opens toward the connecting surface 52c of the main body 52. A second end of the piston receiving hole 62 communicates with the secondary side flow path 54. The axis of the piston receiving hole 62 coincides with the axis of the pressure reducing valve hole 55.

The pressure reducing valve 50 is provided with a pressure reducing piston 63. The pressure reducing piston 63 is accommodated in a piston accommodating hole 62. The pressure reducing piston 63 can move back and forth in the piston accommodating hole 62. The pressure reducing piston 63 has a piston body 64 and a piston shaft 65. The piston shaft 65 protrudes from the end surface of the piston body 64 facing the secondary side flow path 54. The front end of the piston shaft 65 passes through the inner side of the pressure reducing valve hole 55 and abuts against the pressure reducing valve body 58. The pressure reducing piston 63 moves back and forth in a manner integral with the pressure reducing valve body 58 while the front end of the piston shaft 65 abuts against the pressure reducing valve body 58. The end surface of the piston body 64 facing the secondary side flow path 54 is a pressure receiving surface 63a that receives the pressure of the secondary side flow path 54. The pressure reducing piston 63 moves back and forth in a manner that is integrated with the pressure reducing valve body 58 and receives the pressure of the secondary side flow path 54, thereby moving the pressure reducing valve body 58 in the closing direction. The piston body 64 and the piston receiving hole 62 are sealed by a gasket 66.

The main body 51 has a box body 67. The box body 67 has a disc-shaped box body end wall 68 and a cylindrical box body peripheral wall 69. The box body peripheral wall 69 extends cylindrically from the outer periphery of the box body end wall 68. The box body 67 has a flange 70. The flange 70 protrudes outward from the end of the box body peripheral wall 69 on the side opposite to the box body end wall 68. The flange 70 is annular. The box body 67 is installed on the connecting surface 52c by screwing the screw 71 passing through the flange 70 into the main body 52. The interior of the box body peripheral wall 69 is connected to the piston receiving hole 62. The box body 67 is installed on the connecting surface 52c of the main body 52 in a state where the axis of the box body peripheral wall 69 is consistent with the axis of the piston receiving hole 62.

The housing 67 has a fitting recess 72. The fitting recess 72 is formed on an end surface of the housing end wall 68 on the side opposite to the housing peripheral wall 69. The fitting recess 72 is in the shape of a circular hole. The housing 67 has a through hole 73. The through hole 73 is formed on the bottom surface of the fitting recess 72. The axis of the through hole 73 is consistent with the axis of the fitting recess 72. The through hole 73 connects the inner side of the fitting recess 72 with the inner part of the housing peripheral wall 69. The axis of the through hole 73 is consistent with the axis of the housing peripheral wall 69.

The nut 74 is embedded in the fitting recess 72. Therefore, the nut 74 is provided in the housing 67. The nut 74 constitutes a part of the main body 51. The nut 74 has an internal threaded hole 75. Therefore, the pressure reducing valve 50 has the internal threaded hole 75 provided in the main body 51. The nut 74 is fitted into the fitting recess 72 in a state where the axis of the internal threaded hole 75 is aligned with the axis of the through hole 73.

The pressure reducing valve 50 has a pressure reducing spring 76. The pressure reducing spring 76 is housed inside the housing 67. The pressure reducing spring 76 biases the pressure reducing piston 63 toward the pressure reducing valve body 58. When the pressure reducing piston 63 moves toward the pressure reducing valve body 58 under the biasing force of the pressure reducing spring 76, the pressure reducing valve body 58 is squeezed. In this way, the pressure reducing valve body 58 moves away from the valve seat 57. As a result, the pressure reducing valve body 58 is in an open state. Therefore, the pressure reducing spring 76 will bias the pressure reducing piston 63 toward the opening direction of the pressure reducing valve body 58.

The pressure reducing valve 50 is provided with a spring support member 77. The spring support member 77 is in the shape of a disk. The spring support member 77 is housed inside the box body 67. The spring support member 77 can move back and forth inside the box body 67. Inside the box body 67, the spring support member 77 is configured to be closer to the box end wall 68 than the pressure reducing piston 63. The spring support member 77 receives the pressure reducing spring 76. The first end of the pressure reducing spring 76 is supported by the spring support member 77. The second end of the pressure reducing spring 76 is supported by the pressure reducing piston 63. Therefore, the spring support member 77 receives the decompression spring 76 on the side opposite to the decompression piston 63 in the moving direction of the decompression piston 63.

The pressure reducing valve 50 is provided with a threaded adjustment member 78. The threaded adjustment member 78 has an end wall 79 and a peripheral wall 80. The end wall 79 is in the shape of a circular plate. The peripheral wall 80 extends cylindrically from the outer peripheral portion of the end wall 79. An internal threaded hole portion 81 is formed on the inner peripheral surface of the peripheral wall 80. The internal threaded hole portion 81 extends from the opening end of the peripheral wall 80 to the front of the end wall 79. Therefore, the inner peripheral surface of the peripheral wall 80 is substantially all the internal threaded hole portion 81.

The screw-in adjustment member 78 has an external threaded portion 82. The external threaded portion 82 is cylindrical. The external threaded portion 82 protrudes from the central portion of the surface of the end wall 79 on the side opposite to the peripheral wall 80. The external threaded portion 82 is screwed into the internal threaded hole 75 of the nut 74. The front end of the external threaded portion 82 protrudes into the interior of the housing 67 through the internal threaded hole 75 and the through hole 73. The front end of the external threaded portion 82 abuts against the spring support member 77. Therefore, the external threaded portion 82 abuts against the spring support member 77 while being screwed into the internal threaded hole 75.

The screw-in adjustment member 78 is screwed in and out of the internal threaded hole 75 by the external threaded portion 82 to adjust the position of the spring support member 77. Specifically, when the screw-in adjustment member 78 is rotated in the positive direction, the external threaded portion 82 is screwed into the internal threaded hole 75. Then, the external threaded portion 82 screwed into the internal threaded hole 75 squeezes the spring support member 77, thereby moving the spring support member 77 toward the decompression piston 63. In this way, since the distance between the spring support member 77 and the decompression piston 63 is reduced, the elastic force of the decompression spring 76 is increased by the compression of the decompression spring 76.

On the other hand, when the screw-engaged adjustment member 78 is rotated in the reverse direction, for example, the outer threaded portion 82 is screwed out of the inner threaded hole 75. Then, the pressure reducing spring 76 is extended, thereby moving the spring support member 77 away from the pressure reducing piston 63. In this way, since the distance between the spring support member 77 and the pressure reducing piston 63 is increased, the elastic force of the pressure reducing spring 76 is reduced by the extension of the pressure reducing spring 76.

As described above, by adjusting the position of the spring support member 77, the spring force of the decompression spring 76 is adjusted. Therefore, screwing the adjustment member 78 adjusts the spring force of the decompression spring 76. By adjusting the spring force of the decompression spring 76, the spring force of the decompression valve body 58 in the decompression spring 76 to decompress the decompression piston 63 in the valve opening direction is adjusted.

The end wall 79 is formed with a plurality of insertion holes 83. The end wall 79 in the present embodiment is formed with two insertion holes 83. The two insertion holes 83 are formed around the external threaded portion 82 in the end wall 79. Each insertion hole 83 penetrates the end wall 79 in the thickness direction.

As shown in Fig. 3 and Fig. 4, an insertion groove 84 is formed on the opening end surface of the peripheral wall 80. As shown in Fig. 4, two insertion grooves 84 are formed on the opening end surface of the peripheral wall 80. On the opening end surface of the peripheral wall 80, the two insertion grooves 84 are arranged to be 180 degrees in the circumferential direction of the peripheral wall 80. Each insertion groove 84 connects the outer peripheral surface of the peripheral wall 80 and the inner peripheral surface of the peripheral wall 80, and extends straight toward the central axis of the peripheral wall 80.

As shown by the two-point chain in FIG. 4 , the insertion groove 84 allows a tool 85 to be inserted. The tool 85 is, for example, a flat head screwdriver. The front end of the flat head screwdriver is inserted into the insertion groove 84, and the flat head screwdriver is used to rotate the screw-engagement adjustment member 78 so that the external threaded portion 82 is screwed in and out of the internal threaded hole 75. Therefore, the insertion groove 84 allows the tool 85 that screws the external threaded portion 82 in and out of the internal threaded hole 75 to be inserted.

As shown in FIG. 3 , the pressure reducing valve 50 has a fixing member 86 . The fixing member 86 includes a connecting member 87 and a fixing nut 88 .

The connecting member 87 has a flat plate portion 89, a plurality of protrusions 90, a connecting portion 91, and a snap-fit portion 92. The connecting member 87 in this embodiment has two protrusions 90. Each protrusion 90 is columnar. Each protrusion 90 protrudes from the flat plate portion 89. The plurality of protrusions 90 extend parallel to each other. The front end surface of each protrusion 90 is flat.

The connecting portion 91 is columnar. The connecting portion 91 protrudes from the central portion of the surface of the flat plate portion 89 on the side opposite to the protruding portion 90. The engaging portion 92 is connected to the end of the connecting portion 91 on the side opposite to the flat plate portion 89. The engaging portion 92 is circular and extends parallel to the flat plate portion 89. The axis of the connecting portion 91 coincides with the center of the engaging portion 92. The connecting portion 91 and the engaging portion 92 are T-shaped in cross section as a whole.

The fixing nut 88 is cylindrical. The outer peripheral surface of the fixing nut 88 is an outer thread that can be screwed into the inner thread hole 81. The fixing nut 88 is screwed into the inner thread hole 81 on the inner side of the peripheral wall 80 of the screw-engaged adjustment member 78.

The fixing nut 88 has an engagement groove 93. The engagement groove 93 opens toward the first end surface of the fixing nut 88 and also opens toward the outer peripheral surface of the fixing nut 88. The engagement groove 93 is formed by a narrow groove 93a and a wide groove 93b.

The connecting portion 91 and the engaging portion 92 can be slidably inserted into the engaging groove 93 from the opening formed on the outer peripheral surface of the fixing nut 88. Specifically, the connecting portion 91 is slidably inserted into the narrow groove 93a, and the engaging portion 92 is slidably inserted into the wide groove 93b. The engaging portion 92 is engaged with the inner surface of the wide groove 93b. The fixing nut 88 is engaged with the connecting member 87 while being allowed to rotate on the connecting member 87. Each protrusion 90 is inserted into the corresponding insertion hole 83. The connecting member 87 is screwed in and out of the internal threaded hole 81 by the fixing nut 88 so as to be able to move in a manner integral with the fixing nut 88. A plurality of protrusions 90 can protrude from the end wall 79 of the threaded adjustment member 78 and abut against the main body 51. Each protrusion 90 can be in surface contact with the main body 51. Specifically, the front end of each protrusion 90 can be in surface contact with a portion of the outer surface of the box end wall 68 and a portion of the end surface of the nut 74.

As shown in Fig. 3 and Fig. 4, the fixing nut 88 has an operation end face 88a exposed to the outside when viewed from the direction of the opening facing the peripheral wall 80, and the operation end face 88a is formed with a groove 94. The groove 94 extends straight in the radial direction of the fixing nut 88. Both ends of the groove 94 are opened on the outer peripheral surface of the fixing nut 88, respectively.

As shown by the two-dot chain in FIG. 4 , the groove 94 allows a tool 95 to be inserted. The tool 95 is, for example, a flat-head screwdriver. The front end of the flat-head screwdriver is inserted into the groove 94 and the fixing nut 88 is rotated by the flat-head screwdriver so that the fixing nut 88 is screwed in and out of the internal threaded hole 81. Therefore, the groove 94 allows the tool 95 for screwing the fixing nut 88 in and out of the internal threaded hole 81 to be inserted. As shown in FIG. 3 and FIG. 5 , the fixing nut 88 is arranged on the inner side of the peripheral wall 80 in such a manner that the operating end face 88a is closer to the end wall 79 than each insertion groove 84.

The fixing member 86 fixes the screw-on adjustment member 78 to the main body 51. Specifically, each protrusion 90 abuts against the main body 51, so that each protrusion 90 presses the main body 51 while in contact with the surface of the main body 51. The squeezing force exerted on the main body 51 by each protrusion 90 restricts the rotation of the screw-on adjustment member 78. In this way, the screw-on adjustment member 78 is fixed to the main body 51 through the fixing nut 88 and the connecting member 87 in a state where the screwing in and screwing out of the external threaded portion 82 on the internal threaded hole 75 is restricted.

The pressure reducing valve 50 is provided with a pressure gauge 96. The pressure gauge 96 detects the pressure of the secondary side flow path 54. The pressure gauge 96 is provided on the connecting surface 52c of the main body 52. Therefore, the connecting surface 52c is provided with a pressure gauge 96 for detecting the pressure of the secondary side flow path 54. The main body 52 is formed with a mounting hole 97 for mounting the pressure gauge 96. The first end of the mounting hole 97 opens toward the connecting surface 52c. The second end of the mounting hole 97 is connected to the secondary side flow path 54. The sensing portion of the pressure gauge 96 is exposed toward the secondary side flow path 54 through the mounting hole 97. A portion of the pressure gauge 96 protrudes from the mounting hole 97 to the outside. Therefore, the pressure gauge 96 protrudes from the connecting surface 52c.

When viewed from the side facing the connection surface 52c, the pressure gauge 96 is arranged on the connection surface 52c in a state of being adjacent to the screw-fit adjustment member 78 in the long-side direction of the main body 52. Therefore, when viewed from the side facing the connection surface 52c, the screw-fit adjustment member 78 is arranged on the connection surface 52c in a state of being adjacent to the screw-fit adjustment member 78 in the long-side direction of the main body 52.

<Function> Next, the function of this implementation method is explained.

When the pressure of the secondary flow path 54 is lower than the set pressure, the pressure reducing spring 76 resists the pressure of the secondary flow path 54 acting on the pressure receiving surface 63a of the pressure reducing piston 63 to squeeze the pressure reducing piston 63. In this way, the pressure reducing valve body 58 moves away from the valve seat 57. As a result, the pressure reducing valve body 58 is in an open state. When the pressure reducing valve body 58 is in an open state, the fluid from the supply flow path 31 is supplied to the supply port P through the first supply communication flow path 42, the primary flow path 53, the pressure reducing valve hole 55, and the secondary flow path 54. Therefore, the supply flow path 31 supplies the fluid to the supply port P.

When the fluid flows from the primary flow path 53 to the secondary flow path 54 through the pressure reducing valve hole 55, the pressure of the secondary flow path 54 gradually increases. In addition, the pressure acting on the pressure receiving surface 63a of the pressure reducing piston 63 increases, so that the pressure reducing piston 63 moves toward the spring support member 77. Furthermore, the pressure reducing valve body 58 moves toward the valve seat 57 under the pressure of the return spring 61. Then, when the pressure of the secondary flow path 54 reaches the set pressure, the pressure reducing valve body 58 is seated in the valve seat 57 and is in a closed state. In this way, the pressure of the secondary-side flow path 54 is set to the set pressure.

When the spool valve 17 is switched to the first position, the fluid supplied to the supply port P is output to the fluid pressure machine through the first output port A, the first output communication flow path 44, and the first output flow path 32. Then, the pressure fluid from the fluid pressure machine is discharged to the outside through the second output flow path 33, the second output communication flow path 45, the second output port B, the second discharge port R2, the second discharge communication flow path 47, and the second discharge flow path 35.

On the other hand, when the spool valve 17 is switched to the second position, the fluid supplied to the supply port P is output to the fluid pressure machine through the second output port B, the second output communication flow path 45, and the second output flow path 33. Then, the fluid from the fluid pressure machine is discharged to the outside through the first output flow path 32, the first output communication flow path 44, the first output port A, the first discharge port R1, the first discharge communication flow path 46, and the first discharge flow path 34.

The pressure reducing valve 50 reduces the pressure of the fluid supplied from the primary flow path 53 and guides it to the secondary flow path 54. In this way, the fluid output from the solenoid valve 11 is adjusted and reduced to a set pressure by the pressure reducing valve 50. As described above, the pressure reducing valve 50 reduces the pressure of the fluid output from the solenoid valve 11 to a set pressure.

<Adjustment of the elastic force of the pressure reducing spring 76> The operator will adjust the elastic force of the pressure reducing spring 76 so that the pressure reducing valve body 58 is in a closed state when the pressure of the secondary side flow path 54 becomes the set pressure. Specifically, as shown in FIG. 5, the tool 85 is first inserted into the insertion groove 84 in a state where each protrusion 90 is separated from the main body 51. Then, the screw-engaging adjustment member 78 is rotated by the tool 85. In this way, the external threaded portion 82 is screwed in and out of the internal threaded hole 75. As a result, the elastic force of the pressure reducing spring 76 is adjusted by adjusting the position of the spring support member 77.

The operator sets the spring force of the pressure reducing spring 76 by rotating the screw-engaging adjusting member 78 while checking the pressure detected by the pressure gauge 96. In this way, the pressure reducing valve 50 reduces the pressure of the secondary side flow path 54 so that the pressure detected by the pressure gauge 96 becomes the set pressure, thereby reducing the pressure of the fluid output from the solenoid valve 11.

Next, the operator performs the tightening operation of the fixing member 86. Specifically, first, the peripheral wall 80 of the screw-fitted adjustment member 78 is held from the outside with a tool or by hand. In this state, the tool 95 is inserted into the groove 94 of the fixing nut 88. Then, the fixing nut 88 is screwed into the internal threaded hole 81 by the tool 95. At this time, the fixing nut 88 is engaged with the connecting member 87 while being allowed to rotate on the connecting member 87. In this way, the connecting member 87 is guided into the insertion holes 83 corresponding to each protrusion 90 while moving toward the main body 51 together with the fixing nut 88.

As shown in FIG. 3 , each protrusion 90 is in surface contact with the main body 51 by abutting against the main body 51. Then, the rotation of the screw-on adjustment member 78 is restricted by the squeezing force exerted on the main body 51 by each protrusion 90. In this way, the screw-on adjustment member 78 is fixed to the main body 51 through the fixing nut 88 and the connecting member 87. By performing such a tightening operation of the fixing member 86, the screw-on adjustment member 78 can be fixed to the main body 51 without causing the screw-on adjustment member 78 to shift in position.

<Effects> The above implementation method can achieve the following effects.

(1) The fixing nut 88 can be screwed into and out of the internal thread hole 81 by inserting a tool 95 into a groove 94 formed on the operating end surface 88a of the fixing nut 88. Therefore, the fixing member 86 can be tightened in the same direction as the direction in which the external thread portion 82 of the screw-engaged adjusting member 78 is screwed into and out of the internal thread hole 75. Therefore, it is not necessary to tighten the fixing member 86 in a direction that intersects with the direction in which the external thread portion 82 of the screw-engaged adjusting member 78 is screwed into and out of the internal thread hole 75 as in the conventional art. Therefore, even in an environment where sufficient working space cannot be ensured in the direction intersecting the screwing and unscrewing directions of the external threaded portion 82 of the screw-engaged adjustment member 78 with respect to the internal threaded hole 75, the screw-engaged adjustment member 78 can be easily fixed to the main body 51. Therefore, workability is improved.

In addition, since the fixing nut 88 is screwed with the internal thread hole 81 on the inner side of the peripheral wall 80, the fixing nut 88 can be easily screwed in and out of the internal thread hole 81 with the tool 95 while the peripheral wall 80 is held from the outside with a tool or hand. Therefore, the problem of the screwed adjustment member 78 rotating together with the fixing nut 88 can be easily avoided. Therefore, the screwed adjustment member 78 is not prone to positional displacement. In the above manner, the workability can be improved, and the pressure of the secondary side flow path 54 can be accurately adjusted to the set pressure.

(2) The fixing nut 88 is arranged on the inner side of the peripheral wall 80 in such a manner that the operating end surface 88a is closer to the end wall 79 than each insertion groove 84. In this way, when the tool 85 is inserted into the insertion groove 84 and the external threaded portion 82 is screwed into and out of the internal threaded hole 75, the tool 85 can be prevented from interfering with the fixing nut 88.

(3) When a plurality of pressure reducing valves 50 are arranged in parallel in the direction of parallel arrangement of the electromagnetic valves 11, the outer threaded portion 82 of the screw-in adjustment member 78 may not have sufficient working space in the direction intersecting the screw-in and screw-out directions of the inner threaded hole 75. However, in this case, the screw-in adjustment member 78 can be easily fixed to the main body 51 according to the present embodiment, so that the workability is improved.

<Modifications> The above implementation method can also be modified and implemented as follows. The above implementation method and the following modification examples can be combined and implemented within the scope of technical non-contradiction.

・In the embodiment, for example, the outer peripheral surface of the peripheral wall 80 of the screw-engaged adjustment member 78 may be in a shape having a pair of flat surfaces. In addition, for example, a pair of flat surfaces may be inserted with a wrench, and the screw-engaged adjustment member 78 may be rotated by the wrench. In this case, the insertion groove 84 into which the tool 85 can be inserted may not be formed on the opening end surface of the peripheral wall 80. For example, as long as the insertion groove 84 is not formed on the opening end surface of the peripheral wall 80, it is not necessary to arrange the fixing nut 88 on the inner side of the peripheral wall 80 in a manner that the operating end surface 88a is closer to the end wall 79 than the insertion groove 84.

In the embodiment, for example, the outer peripheral surface of the screw-fitting adjustment member 78 may have a rolled surface. In addition, the worker may hold the rolled surface with his hand to rotate the screw-fitting adjustment member 78. In this case, the insertion groove 84 for inserting the tool 85 may not be formed on the opening end surface of the peripheral wall 80.

In the embodiment, the groove 94 may not extend straight in the radial direction of the fixing nut 88, and may be in the shape of a hexagonal hole, for example. In addition, the front end of a hexagonal wrench may be inserted into the groove 94, and the fixing nut 88 may be rotated by the hexagonal wrench, so that the fixing nut 88 is screwed in and out of the internal threaded hole 81.

In the embodiment, the number of the protrusions 90 is not particularly limited. The number of the insertion holes 83 may be appropriately changed according to the number of the protrusions 90.

In the embodiment, the nut 74 may not be provided in the case 67. In addition, for example, the internal threaded hole 75 may be formed in the case end wall 68 of the case 67. In other words, the pressure reducing valve 50 only needs to have the internal threaded hole 75 provided in the main body 51.

In the embodiment, the pressure reducing valve 50 is not limited to the configuration in which the pressure gauge 96 is arranged on the connecting surface 52 c in a state of being closely connected to the screw-engaged adjustment member 78 in the longitudinal direction of the main body 52 .

In the embodiment, the solenoid valve manifold 10 may be configured to omit the spacer 40, for example. In short, the pressure reducing valve 50 is not particularly limited in configuration as long as it can reduce the pressure of the fluid supplied from the primary flow path 53 and guide it to the secondary flow path 54, thereby reducing the pressure of the fluid output from the solenoid valve 11 to a set pressure.

In the embodiment, the solenoid valve 11 is a double solenoid pilot type solenoid valve, but the present invention is not limited thereto. For example, a single solenoid pilot type solenoid valve having only one pilot valve may be used.

・In the embodiment, the solenoid valve 11 may be a 4-port solenoid valve in which the second discharge port R2 is omitted. In short, the solenoid valve 11 only needs to have at least one discharge port. In addition, the solenoid valve 11 may also be a 3-port solenoid valve having a supply port, an output port, and a discharge port.

50: Pressure reducing valve 51: Main body 53: Primary flow path 54: Secondary flow path 55: Pressure reducing valve hole 58: Pressure reducing valve body 63: Pressure reducing piston 75: Internal threaded hole 76: Pressure reducing spring 77: Spring support member 78: Screw-in adjustment member 79: End wall 80: Peripheral wall 81: Internal threaded hole 82: External threaded portion 83: Insertion hole 84: Insertion groove 85: Tool 86: Fixing member 87: Connecting member 88: Fixing nut 88a: Operation end surface 90: Protrusion 94: Groove

FIG. 1 is a cross-sectional view of a solenoid valve manifold showing an embodiment. FIG. 2 is a top view of the solenoid valve manifold of FIG. 1 . FIG. 3 is a cross-sectional view of a pressure reducing valve of FIG. 1 . FIG. 4 is a top view of a screw-in adjustment member and a fixing nut of FIG. 2 . FIG. 5 is a cross-sectional view of the pressure reducing valve of FIG. 1 . FIG. 6 is a cross-sectional view for explaining the known technology.

50: Pressure reducing valve

51: Subject

75: Internal thread hole

76: Pressure reducing spring

77: Spring support member

78: Screw-on adjustment member

79: End wall

80: surrounding wall

81: Internal thread hole

82: External thread part

83: Insert through hole

86:Fixed components

87: Connecting components

88:Fixing nut

88a: Operation end surface

90: protrusion

94: Groove

Claims (2)

A pressure reducing valve comprises a main body, a pressure reducing valve body, a pressure reducing piston, a pressure reducing spring, a spring supporting member, an internal threaded hole, a threaded adjustment member, and a fixing member. The main body has a primary flow path, a secondary flow path, and a pressure reducing valve hole connecting the primary flow path with the secondary flow path. The pressure reducing valve body switches the pressure reducing valve hole. The pressure reducing piston can move back and forth in a manner integrated with the pressure reducing valve body, and by bearing the pressure of the secondary flow path, the pressure reducing valve body moves in a closing direction. The decompression spring will pressurize the decompression piston toward the opening direction of the decompression valve body. The spring support member will bear the decompression spring on the opposite side of the decompression piston in the moving direction of the decompression piston. The internal threaded hole is provided in the main body. The threaded adjustment member will adjust the position of the spring support member to adjust the spring force of the decompression spring. The fixing member will fix the threaded adjustment member on the main body. The decompression valve will decompress the pressure of the fluid supplied from the primary flow path and guide it to the secondary flow path. The screw-in adjustment member has an external threaded portion, which is screwed into the internal threaded hole and abuts against the spring support member at the same time. The external threaded portion is screwed in and out of the internal threaded hole to adjust the position of the spring support member. The screw-in adjustment member further has an end wall and a peripheral wall extending in a cylindrical shape from the outer peripheral portion of the end wall. The inner peripheral surface of the peripheral wall is formed with an internal threaded hole. The external threaded portion is columnar and protrudes from the central portion of the surface of the end wall on the side opposite to the peripheral wall. A plurality of insertion holes are formed around the external threaded portion in the end wall. The fixing member includes a connecting member and a fixing nut. The connecting member has a plurality of protrusions, which can be inserted through the insertion holes and protrude from the end wall to abut against the main body. The fixing nut is engaged with the connecting member while being allowed to rotate on the connecting member, and is screwed with the internal thread hole on the inner side of the peripheral wall. The fixing nut has an operating end surface exposed to the outside when viewed from the direction facing the opening of the peripheral wall, and the operating end surface is formed with a groove for inserting a tool, and the tool is used to screw the fixing nut in and out of the internal thread hole. A pressure reducing valve as described in claim 1, wherein the opening end surface of the peripheral wall is formed with an insertion groove for inserting a tool, the tool being used to screw the external threaded portion into and out of the internal threaded hole, and the fixing nut is arranged on the inner side of the peripheral wall in such a manner that the operating end surface is closer to the end wall than the insertion groove.

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