JP2024048842A - Pressure reducing valve - Google Patents

Abstract

[Problem] To adjust the pressure of the secondary flow passage to a set pressure with high accuracy while improving workability. [Solution] A tool is inserted into a groove 94 formed on an operation end surface 88a of a fixed nut 88, and the female threaded portion 81 of the fixed nut 88 is threadedly advanced and retreated by the tool. Therefore, it is possible to perform the tightening work of a fixed member 86 from the same direction as the direction in which the male threaded portion 82 of an adjustment screw member 78 is threadedly advanced and retreated by the female threaded hole 75. Since the fixed nut 88 is threadedly engaged with the female threaded portion 81 on the inside of a peripheral wall 80, it is possible to easily advance and retreat the female threaded portion 81 of the fixed nut 88 by the tool while holding the peripheral wall 80 from the outside of the peripheral wall 80 with a tool or by hand. Therefore, it is easy to prevent the adjustment screw member 78 from rotating together with the fixed nut 88. Therefore, it is difficult for the position of the adjustment screw member 78 to be shifted. [Selected Figure] FIG. 3

Description

The present invention relates to a pressure reducing valve.

The pressure reducing valve reduces the pressure of the fluid supplied from the primary flow path and delivers it to the secondary flow path. The pressure reducing valve has a body. The 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 and 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 receiving member. The pressure reducing valve body opens and closes the pressure reducing valve hole. The pressure reducing piston can reciprocate integrally with the pressure reducing valve body. The pressure reducing piston receives the pressure of the secondary flow path and moves in a direction that closes the pressure reducing valve body. The pressure reducing spring biases the pressure reducing piston in a direction that opens the pressure reducing valve body. The spring receiving member receives the pressure reducing spring on the opposite side to the pressure reducing piston in the moving direction of the pressure reducing piston. The body has a female thread hole.

The pressure reducing valve also includes an adjustment screw member and a fixing member. The adjustment screw member has a male threaded portion. The male threaded portion screws into the female threaded hole. The male threaded portion abuts against the spring receiving member. The adjustment screw member adjusts the position of the spring receiving member by threading the male threaded portion back and forth relative to the female threaded hole, 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 closes when the pressure in the secondary flow path reaches the set pressure. When the adjustment of the spring force of the pressure reducing spring is completed, the adjustment screw member is fixed to the body by the fixing member. In this way, the pressure reducing valve reduces the pressure of the fluid supplied from the primary flow path and delivers it to the secondary flow path.

Figure 6 shows a portion of the pressure reducing valve 100 of Patent Document 1, for example. As shown in Figure 6, the adjustment screw member 101 protrudes from the body 102. Then, by performing a tightening operation of the nut 103, which is a fixing member, by screwing the nut 103 onto the adjustment screw member 101 until the nut 103 abuts against the body 102, the adjustment screw member 101 is fixed to the body 102 via the nut 103.

Japanese Patent Application Laid-Open No. 9-179634

However, in Patent Document 1, the adjustment screw member 101 protrudes from the end surface 103a of the nut 103. Therefore, when tightening the nut 103, it is necessary to tighten the nut 103 with a tool such as a wrench from a direction intersecting the direction in which the adjustment screw member 101 is screwed into the female threaded hole 104. Therefore, if sufficient working space cannot be secured in a direction intersecting the direction in which the adjustment screw member 101 is screwed into the female threaded hole 104, it may be difficult to tighten the nut 103. As a result, it becomes difficult to fix the adjustment screw member 101 to the body 102, which reduces workability.

In addition, if the adjustment screw member 101 rotates together with the nut 103 when the nut 103 is tightened, the adjustment screw member 101 will be displaced. This will change the spring force of the pressure reducing spring 105, and as a result, it will not be possible to accurately adjust the pressure in the secondary flow path to the set pressure. Therefore, when tightening the nut 103, it is necessary to hold the adjustment screw member 101, for example, with a tool or by hand so that the adjustment screw member 101 does not rotate together with the nut 103. However, in a configuration in which the adjustment screw member 101 protrudes from the end face 103a of the nut 103, it is difficult to tighten the nut 103 while holding the part of the adjustment screw member 101 protruding from the end face 103a of the nut 103 with a tool or by hand. Therefore, it is desired to be able to easily fix the adjustment screw member 101 to the body 102 and to make it difficult for the adjustment screw member 101 to be displaced, thereby improving workability while accurately adjusting the pressure in the secondary flow path to the set pressure.

The pressure reducing valve that solves the above problem comprises a body having a primary flow path, a secondary flow path, and a pressure reducing valve hole that communicates the primary flow path with the secondary flow path, a pressure reducing valve body that opens and closes the pressure reducing valve hole, a pressure reducing piston that is capable of reciprocating integrally with the pressure reducing valve body and that receives the pressure of the secondary flow path to move the pressure reducing valve body in a direction to close the valve, a pressure reducing spring that urges the pressure reducing piston in a direction to open the valve, a spring receiving member that receives the pressure reducing spring on the opposite side to the pressure reducing piston in the moving direction of the pressure reducing piston, a female threaded hole provided in the body, and an adjustment screw member that screws into the female threaded hole and has a male threaded portion that abuts against the spring receiving member, and that adjusts the position of the spring receiving member by screwing the male threaded portion back and forth relative to the female threaded hole to adjust the spring force of the pressure reducing spring, and a fixing member that fixes the adjustment screw member to the body, A pressure reducing valve that reduces the pressure of a fluid supplied from a flow path and delivers it to the secondary flow path, the adjustment screw member has an end wall and a peripheral wall extending cylindrically from the outer periphery of the end wall, a female thread is formed on the inner periphery of the peripheral wall, the male thread is columnar and protrudes from the center of the surface of the end wall opposite the peripheral wall, and a plurality of insertion holes are formed around the male thread in the end wall, the fixing member includes a connecting member that is inserted into each of the insertion holes and has a plurality of protrusions that protrude from the end wall and can abut against the body, and a fixing nut that is engaged with the connecting member while allowing rotation relative to the connecting member and screws into the female thread inside the peripheral wall, and a groove is formed on the operating end surface, which is the end surface of the fixing nut facing the opening of the peripheral wall, into which a tool can be inserted to screw the female thread in the fixing nut.

In the pressure reducing valve, an insertion groove is formed in the open end surface of the peripheral wall into which a tool can be inserted to thread the male thread portion into the female threaded hole, and the fixing nut is preferably disposed inside the peripheral wall such that the operating end surface is located closer to the end wall than the insertion groove.

This invention makes it possible to accurately adjust the pressure in the secondary flow path to a set pressure while improving workability.

FIG. 2 is a cross-sectional view showing a solenoid valve manifold in the embodiment. FIG. 2 is a plan view of the solenoid valve manifold. FIG. FIG. 4 is a plan view of the adjusting screw member and the fixing nut. FIG. FIG. 1 is a cross-sectional view for explaining a conventional technique.

One embodiment of a pressure reducing valve will be 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 a solenoid valve. The solenoid valve constitutes a solenoid valve manifold.

<Overall configuration of solenoid valve manifold 10>
1 and 2, the solenoid valve manifold 10 includes a solenoid valve 11, a manifold base 30, a spacer 40, and a pressure reducing valve 50. A plurality of solenoid valves 11 are arranged in parallel. The spacer 40 is interposed between the manifold base 30 and the solenoid valve 11. The manifold base 30, the spacer 40, and the pressure reducing valve 50 are arranged in parallel in the direction in which the solenoid valves 11 are arranged in parallel, corresponding to the plurality of solenoid valves 11 arranged in parallel. Therefore, the respective directions in which the manifold base 30, the spacer 40, and the pressure reducing valve 50 are arranged in parallel coincide with the direction in which the solenoid valves 11 are arranged in parallel.

<Solenoid valve 11>
As shown in Fig. 1, each solenoid valve 11 has a valve casing 12. The valve casing 12 is in the shape of a rectangular block. The valve casing 12 has a casing body 13, a first connection block 14, and a second connection block 15. The casing body 13 is in the shape of a rectangular block. The first connection block 14 is connected to a first end of the casing body 13 in the longitudinal direction. The second connection block 15 is connected to a second end of the casing body 13 in the longitudinal direction. The casing body 13 has a body facing surface 13a that faces the spacer 40.

The valve casing 12 has a valve hole 16. The valve hole 16 is formed in the casing body 13. The valve hole 16 is a circular hole. The valve hole 16 extends in the longitudinal direction of the casing body 13. A first end of the valve hole 16 opens into a first longitudinal end face of the casing body 13. A second end of the valve hole 16 opens into a second longitudinal end face of the casing body 13. Thus, the valve hole 16 penetrates the casing body 13 in the longitudinal 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 with the axial direction of the spool valve 17 coinciding with the axial direction of the valve hole 16. The spool valve 17 is accommodated in the valve hole 16 so as to be able to reciprocate.

Each solenoid valve 11 has a supply port P, a first output port A, a second output port B, a first exhaust port R1, and a second exhaust port R2. Therefore, each solenoid valve 11 in this embodiment is a five-port solenoid valve. The supply port P, the first output port A, the second output port B, the first exhaust port R1, and the second exhaust port R2 are formed in the casing body 13. The supply port P, the first output port A, the second output port B, the first exhaust port R1, and the second exhaust port R2 are each connected to the valve hole 16.

The first exhaust port R1, the first output port A, the supply port P, the second output port B, and the second exhaust port R2 are arranged in this order in the casing body 13 from the first end to the second end in the longitudinal direction of the casing body 13. The first ends of the supply port P, the first output port A, the second output port B, the first exhaust port R1, and the second exhaust 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 exhaust port R1, and the second exhaust port R2 are open to the body-facing surface 13a of the casing body 13.

Each solenoid valve 11 has a first piston 18 and a second piston 19. The first piston 18 is disk-shaped. The first piston 18 is connected to a first end of the spool valve 17. The first piston 18 moves integrally with the spool valve 17. The second piston 19 is disk-shaped. The second piston 19 is connected to a second end of the spool valve 17. The second piston 19 moves integrally with the spool valve 17.

A circular hole-shaped first piston accommodating recess 20 is formed in the first connecting block 14. The first piston 18 is accommodated in the first piston accommodating recess 20 so that it can reciprocate. A first pilot pressure chamber 21 is defined by the first piston accommodating recess 20 and the first piston 18. Pilot fluid is supplied to and discharged from the first pilot pressure chamber 21.

A circular hole-shaped second piston accommodating recess 22 is formed in the second connecting block 15. The second piston 19 is accommodated in the second piston accommodating recess 22 so that it can reciprocate. The second piston accommodating recess 22 and the second piston 19 define a second pilot pressure chamber 23. Pilot fluid is supplied to and discharged from the second pilot pressure chamber 23.

Each solenoid valve 11 is equipped with a first pilot valve V1 and a second pilot valve V2. Therefore, the solenoid valve 11 is a double solenoid type pilot solenoid valve. 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 a first position and a second position. For example, suppose that a voltage is applied to the first pilot valve V1 and that the voltage application to the second pilot valve V2 is stopped. Then, the first pilot valve V1 supplies compressed fluid from a fluid supply source (not shown) to the first pilot pressure chamber 21 as pilot fluid. Meanwhile, the second pilot valve V2 discharges the pilot fluid in the second pilot pressure chamber 23 to the atmosphere. This causes the spool valve 17 to move toward the second piston accommodating recess 22. As a result, the spool valve 17 switches to the first position in which the supply port P communicates with the first output port A and the second output port B communicates with the second exhaust port R2. In addition, when the spool valve 17 switches to the first position, the supply port P is blocked from the second output port B and the first output port A is blocked from the first exhaust port R1.

For example, suppose that the application of voltage to the first pilot valve V1 is stopped and that voltage is applied to the second pilot valve V2. Then, the second pilot valve V2 supplies compressed fluid from the fluid supply source to the second pilot pressure chamber 23 as pilot fluid. Meanwhile, the first pilot valve V1 exhausts the pilot fluid in the first pilot pressure chamber 21 to the atmosphere. This causes the spool valve 17 to move toward the first piston accommodating recess 20. As a result, the spool valve 17 switches to a second position that connects the supply port P to the second output port B and connects the first output port A to the first exhaust port R1. When the spool valve 17 switches to the second position, the supply port P is blocked from the first output port A and the second output port B is blocked from the second exhaust port R2.

In this way, pilot fluid is supplied to and discharged from the first pilot pressure chamber 21 in the first pilot valve V1, and pilot fluid is supplied to and discharged from the second pilot pressure chamber 23 in the second pilot valve V2. This causes the spool valve 17 to reciprocate within the valve hole 16 between the first and second positions. The communication between the ports is switched by the spool valve 17 switching between the first and second positions. Note that FIG. 1 shows the spool valve 17 in the second position.

<Manifold base 30>
Each manifold base 30 is in the shape of a rectangular block. Each manifold base 30 has a mounting surface 30a. The solenoid valve 11 is mounted on the mounting surface 30a via a spacer 40. The longitudinal direction of each manifold base 30 coincides with the longitudinal direction of the valve casing 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 exhaust flow path 34, and a second exhaust flow path 35. The supply flow path 31, the first output flow path 32, the second output flow path 33, the first exhaust flow path 34, and the second exhaust flow path 35 open to the mounting surface 30a.

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

<Spacer 40>
Each spacer 40 has a rectangular block shape. Each spacer 40 has a first opposing surface 40a facing the valve casing 12 and a second opposing surface 40b facing the manifold base 30. The longitudinal direction of each spacer 40 coincides with the longitudinal direction of the valve casing 12.

Each spacer 40 has an attachment surface 41. The attachment surface 41 is an end face located on one side of the spacer 40 in the longitudinal direction. Each spacer also has a first supply communication passage 42, a second supply communication passage 43, a first output communication passage 44, a second output communication passage 45, a first exhaust communication passage 46, and a second exhaust communication passage 47.

The first supply communication flow passage 42 has a first end connected to the supply flow passage 31 and a second end opening to the mounting surface 41. The second supply communication flow passage 43 has a first end connected to the supply port P and a second end opening to the mounting surface 41. The opening position of the second supply communication flow passage 43 relative to the mounting surface 41 is located closer to the first opposing surface 40a than the opening position of the first supply communication flow passage 42 relative to the mounting surface 41.

The first output communication flow path 44 communicates between the first output flow path 32 and the first output port A. The second output communication flow path 45 communicates between the second output flow path 33 and the second output port B. The first exhaust communication flow path 46 communicates between the first exhaust flow path 34 and the first exhaust port R1. The second exhaust communication flow path 47 communicates between the second exhaust flow path 35 and the second exhaust port R2.

The solenoid valve manifold 10 includes a first seal member 48 and a second seal member 49. The first seal member 48 provides a seal between each spacer 40 and each manifold base 30. The first seal member 48 is, for example, a thin gasket. The second seal member 49 provides a seal between each spacer 40 and each valve casing 12. The second seal member 49 is, for example, a thin gasket.

<Pressure reducing valve 50>
Each pressure reducing valve 50 includes a body 51. The body 51 has a body main body 52. The body main body 52 is in the shape of a rectangular block. The body 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 on one side of the body main body 52 in the longitudinal direction. The second surface 52b is a surface located on the other side of the body 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 width direction of the body main body 52.

Each body 51 is attached to each spacer 40. Specifically, each body 51 is attached to the mounting surface 41 of each spacer 40 with the first surface 52a of the body main body 52 facing the mounting surface 41 of each spacer 40. As shown in FIG. 2, the manifold base 30, the spacer 40, and the pressure reducing valve 50 are arranged in a row in the direction in which the solenoid valves 11 are arranged in a row, corresponding to the multiple solenoid valves 11 arranged in a row. The width direction of each body main body 52 coincides with the direction in which the solenoid valves 11 are arranged in a row. In FIG. 2, the width direction of each body main body 52 is indicated by the arrow X1.

As shown in FIG. 1, the body 51 has a primary side flow passage 53, a secondary side flow passage 54, and a pressure reducing valve hole 55. The primary side flow passage 53 and the secondary side flow passage 54 penetrate the body main body 52 in the longitudinal direction. The primary side flow passage 53 and the secondary side flow passage 54 open to the first surface 52a and the second surface 52b, respectively. The secondary side flow passage 54 is located closer to the connection surface 52c than the primary side flow passage 53. The primary side flow passage 53 communicates with the first supply communication flow passage 42. The secondary side flow passage 54 communicates with the second supply communication flow passage 43. The end of the primary side flow passage 53 opposite to the first supply communication flow passage 42 and the end of the secondary side flow passage 54 opposite to the second supply communication flow passage 43 are blocked by a blocking member 56. The blocking member 56 constitutes a part of the body 51.

As shown in FIG. 3, the 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 around the pressure reducing valve hole 55 on the primary flow path 53 side of the main body 52.

The pressure reducing valve 50 is equipped with 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 can reciprocate in a direction approaching and moving away from the valve seat 57. The pressure reducing valve body 58 is constructed by lining a metal spring bearing with rubber and integrating it into one body. The pressure reducing valve body 58 is housed in the body main body 52 via a hole 59 that opens on the surface of the body main body 52 opposite the connection surface 52c. The hole 59 is sealed by a plug 60.

The pressure reducing valve body 58 is opened by moving away from the valve seat 57. When the pressure reducing valve body 58 is opened, communication between the primary flow path 53 and the secondary flow path 54 is permitted via the pressure reducing valve hole 55. On the other hand, the pressure reducing valve body 58 is closed by seating on the valve seat 57. When the pressure reducing valve body 58 is closed, communication between the primary flow path 53 and the secondary flow path 54 via the pressure reducing valve hole 55 is blocked.

The pressure reducing valve 50 has a return spring 61. The return spring 61 is interposed between the pressure reducing valve body 58 and the plug 60. The return spring 61 biases the pressure reducing valve body 58 toward the valve seat 57. Therefore, the return spring 61 biases the pressure reducing valve body 58 in a direction in which the pressure reducing valve body 58 closes.

The main body 52 has a piston accommodating hole 62. A first end of the piston accommodating hole 62 opens to the connection surface 52c of the main body 52. A second end of the piston accommodating hole 62 communicates with the secondary flow passage 54. The axis of the piston accommodating 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 the piston accommodation hole 62. The pressure reducing piston 63 can reciprocate in the piston accommodation 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 face of the piston body 64 on the secondary side flow path 54 side. The tip of the piston shaft 65 passes through the inside of the pressure reducing valve hole 55 and abuts against the pressure reducing valve body 58. The pressure reducing piston 63 can reciprocate integrally with the pressure reducing valve body 58 with the tip of the piston shaft 65 abutting against the pressure reducing valve body 58. In addition, the end face of the piston body 64 on the secondary side flow path 54 side is a pressure receiving surface 63a that receives the pressure of the secondary side flow path 54. The pressure reducing piston 63 can reciprocate integrally with the pressure reducing valve body 58, and by receiving the pressure of the secondary side flow path 54, the pressure reducing valve body 58 moves in the direction of closing the valve. The gap between the piston body 64 and the piston housing hole 62 is sealed with a packing 66.

The body 51 has a case 67. The case 67 has a disk-shaped case end wall 68 and a cylindrical case peripheral wall 69. The case peripheral wall 69 extends cylindrically from the outer periphery of the case end wall 68. The case 67 has a flange 70. The flange 70 protrudes outward from the end of the case peripheral wall 69 opposite the case end wall 68. The flange 70 is annular. The case 67 is attached to the connection surface 52c by a screw 71 that penetrates the flange 70 and is screwed into the body main body 52. The inside of the case peripheral wall 69 is in communication with the inside of the piston accommodating hole 62. The case 67 is attached to the connection surface 52c of the body main body 52 with the axis of the case peripheral wall 69 coinciding with the axis of the piston accommodating hole 62.

The case 67 has a fitting recess 72. The fitting recess 72 is formed on the end face of the case end wall 68 that is located on the opposite side to the case peripheral wall 69. The fitting recess 72 is a circular hole. The case 67 has a through hole 73. The through hole 73 is formed on the bottom face of the fitting recess 72. The axis of the through hole 73 coincides with the axis of the fitting recess 72. The through hole 73 communicates between the inside of the fitting recess 72 and the inside of the case peripheral wall 69. The axis of the through hole 73 coincides with the axis of the case peripheral wall 69.

A nut 74 is fitted into the fitting recess 72. Therefore, the case 67 is provided with the nut 74. The nut 74 constitutes a part of the body 51. The nut 74 has a female threaded hole 75. Therefore, the pressure reducing valve 50 has a female threaded hole 75 provided in the body 51. The nut 74 is fitted into the fitting recess 72 with the axis of the female threaded hole 75 coinciding with the axis of the through hole 73.

The pressure reducing valve 50 is equipped with a pressure reducing spring 76. The pressure reducing spring 76 is housed inside the case 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 due to the biasing force of the pressure reducing spring 76, it presses the pressure reducing valve body 58. This causes the pressure reducing valve body 58 to move in a direction 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 biases the pressure reducing piston 63 in a direction in which the pressure reducing valve body 58 opens.

The pressure reducing valve 50 is provided with a spring receiving member 77. The spring receiving member 77 is disk-shaped. The spring receiving member 77 is housed inside the case 67. The spring receiving member 77 is capable of reciprocating inside the case 67. Inside the case 67, the spring receiving member 77 is disposed closer to the case end wall 68 than the pressure reducing piston 63. The spring receiving member 77 receives a pressure reducing spring 76. A first end of the pressure reducing spring 76 is supported by the spring receiving member 77. A second end of the pressure reducing spring 76 is supported by the pressure reducing piston 63. Therefore, the spring receiving member 77 receives the pressure reducing spring 76 on the side opposite the pressure reducing piston 63 in the direction of movement of the pressure reducing piston 63.

The pressure reducing valve 50 is equipped with an adjustment screw member 78. The adjustment screw member 78 has an end wall 79 and a peripheral wall 80. The end wall 79 is disk-shaped. The peripheral wall 80 extends cylindrically from the outer periphery of the end wall 79. An internal thread portion 81 is formed on the inner circumferential surface of the peripheral wall 80. The internal thread portion 81 extends from the open end of the peripheral wall 80 to just before the end wall 79. Therefore, almost the entire inner circumferential surface of the peripheral wall 80 is the internal thread portion 81.

The adjustment screw member 78 has a male threaded portion 82. The male threaded portion 82 is cylindrical. The male threaded portion 82 protrudes from the center of the surface of the end wall 79 opposite the peripheral wall 80. The male threaded portion 82 screws into the female threaded hole 75 of the nut 74. The tip of the male threaded portion 82 passes through the female threaded hole 75 and the through hole 73 and protrudes into the inside of the case 67. The tip of the male threaded portion 82 abuts against the spring receiving member 77. Therefore, the male threaded portion 82 screws into the female threaded hole 75 and abuts against the spring receiving member 77.

The adjustment screw member 78 adjusts the position of the spring receiving member 77 by threading the male threaded portion 82 into the female threaded hole 75. Specifically, when the adjustment screw member 78 rotates in the forward direction, the male threaded portion 82 threads into the female threaded hole 75. Then, the male threaded portion 82 threading into the female threaded hole 75 presses the spring receiving member 77, causing the spring receiving member 77 to move toward the pressure reducing piston 63. As a result, the distance between the spring receiving member 77 and the pressure reducing piston 63 becomes smaller, and the pressure reducing spring 76 is compressed, increasing the spring force of the pressure reducing spring 76.

On the other hand, for example, when the adjustment screw member 78 rotates in the opposite direction to the forward direction, the male threaded portion 82 retracts from the female threaded hole 75. Then, as the pressure reduction spring 76 attempts to expand, the spring receiving member 77 moves in a direction away from the pressure reduction piston 63. This increases the distance between the spring receiving member 77 and the pressure reduction piston 63, and as the pressure reduction spring 76 expands, the spring force of the pressure reduction spring 76 decreases.

In this way, the spring force of the pressure reduction spring 76 is adjusted by adjusting the position of the spring receiving member 77. Therefore, the adjustment screw member 78 adjusts the spring force of the pressure reduction spring 76. By adjusting the spring force of the pressure reduction spring 76, the biasing force of the pressure reduction spring 76 that biases the pressure reduction piston 63 in the direction in which the pressure reduction valve body 58 opens is adjusted.

The end wall 79 has multiple insertion holes 83 formed therein. In this embodiment, the end wall 79 has two insertion holes 83 formed therein. The two insertion holes 83 are formed around the male threaded portion 82 in the end wall 79. Each insertion hole 83 penetrates the end wall 79 in the thickness direction.

As shown in Figures 3 and 4, an insertion groove 84 is formed in the open end surface of the peripheral wall 80. As shown in Figure 4, two insertion grooves 84 are formed in the open end surface of the peripheral wall 80. The two insertion grooves 84 are arranged 180 degrees apart in the circumferential direction of the peripheral wall 80 on the open end surface of the peripheral wall 80. Each insertion groove 84 connects the outer peripheral surface of the peripheral wall 80 with the inner peripheral surface of the peripheral wall 80 and extends straight toward the axis of the peripheral wall 80.

As shown by the two-dot chain line in FIG. 4, a tool 85 can be inserted into each insertion groove 84. The tool 85 is, for example, a flat-head screwdriver. The tip of the flat-head screwdriver is inserted into each insertion groove 84, and the adjustment screw member 78 is rotated with the flat-head screwdriver to thread the male threaded portion 82 into the female threaded hole 75. Therefore, a tool 85 for threading the male threaded portion 82 into the female threaded hole 75 can be inserted into each insertion groove 84.

3, the pressure reducing valve 50 includes 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 protruding portions 90, a connection portion 91, and a locking portion 92. In this embodiment, the connecting member 87 has two protruding portions 90. Each of the protruding portions 90 is columnar. Each of the protruding portions 90 protrudes from the flat plate portion 89. The protruding portions 90 extend parallel to each other. The tip surface of each of the protruding portions 90 is flat.

The connection portion 91 is columnar. The connection portion 91 protrudes from the center of the surface of the flat portion 89 opposite the protrusions 90. The locking portion 92 is connected to the end of the connection portion 91 opposite the flat portion 89. The locking portion 92 is disc-shaped and extends parallel to the flat portion 89. The axis of the connection portion 91 coincides with the center of the locking portion 92. The connection portion 91 and the locking portion 92 as a whole have a T-shaped cross section.

The fixing nut 88 is cylindrical. The outer peripheral surface of the fixing nut 88 is male-threaded so that it can be screwed into the female-threaded portion 81. The fixing nut 88 is screwed into the female-threaded portion 81 on the inside of the peripheral wall 80 of the adjustment screw member 78.

The fixed nut 88 has a locking groove 93. The locking groove 93 opens to the first end face of the fixed nut 88 and also opens to the outer peripheral surface of the fixed nut 88. The locking groove 93 is formed of a narrow groove 93a and a wide groove 93b.

The connection portion 91 and the locking portion 92 can be slidably inserted into the locking groove 93 from the outer periphery of the fixed nut 88. Specifically, the connection portion 91 is slidably inserted into the narrow groove 93a, and the locking portion 92 is slidably inserted into the wide groove 93b. The locking portion 92 is locked to the inner surface of the wide groove 93b. The fixed nut 88 is locked to the connecting member 87 in a state in which rotation relative to the connecting member 87 is permitted. Each protrusion 90 is inserted into each insertion hole 83. The connecting member 87 can move integrally with the fixed nut 88 by being screwed forward and backward relative to the female thread portion 81 of the fixed nut 88. Each protrusion 90 can protrude from the end wall 79 of the adjustment screw member 78 and abut against the body 51. Each protrusion 90 can be in surface contact with the body 51. Specifically, the tip of each protrusion 90 can be in surface contact with a part of the outer surface of the case end wall 68 and a part of the end surface of the nut 74.

As shown in Figures 3 and 4, a groove 94 is formed in the operation end surface 88a, which is the end surface of the fixing nut 88 facing the opening of the peripheral wall 80. The groove 94 extends straight in the radial direction of the fixing nut 88. Both ends of the groove 94 open onto the outer peripheral surface of the fixing nut 88.

As shown by the two-dot chain line in FIG. 4, a tool 95 can be inserted into the recessed groove 94. The tool 95 is, for example, a flat-head screwdriver. The tip of the flat-head screwdriver is inserted into the recessed groove 94 and the fixing nut 88 is rotated with the flat-head screwdriver to screw the fixing nut 88 into and out of the female threaded portion 81. Therefore, the tool 95 for screwing the fixing nut 88 into and out of the female threaded portion 81 can be inserted into the recessed groove 94. As shown in FIG. 3 and FIG. 5, the fixing nut 88 is disposed inside the peripheral wall 80 so that the operating end surface 88a is located closer to the end wall 79 than each insertion groove 84.

The fixing member 86 fixes the adjustment screw member 78 to the body 51. Specifically, each protrusion 90 abuts against the body 51, pressing the body 51 with each protrusion 90 in surface contact with the body 51. The pressing force of each protrusion 90 against the body 51 restricts the rotation of the adjustment screw member 78. As a result, the adjustment screw member 78 is fixed to the body 51 via the fixing nut 88 and the connecting member 87 with its screw advance/retraction into the female threaded hole 75 in the male threaded portion 82 restricted.

The pressure reducing valve 50 is equipped with a pressure gauge 96. The pressure gauge 96 detects the pressure of the secondary flow path 54. The pressure gauge 96 is provided on the connection surface 52c of the main body 52. Therefore, the connection surface 52c is provided with the pressure gauge 96 that detects the pressure of the secondary flow path 54. The main body 52 is formed with a mounting hole 97 in which the pressure gauge 96 is mounted. A first end of the mounting hole 97 opens to the connection surface 52c. A second end of the mounting hole 97 communicates with the secondary flow path 54. The sensor portion of the pressure gauge 96 faces the secondary flow path 54 through the mounting hole 97. A part of the pressure gauge 96 protrudes from the mounting hole 97 to the outside. Therefore, the pressure gauge 96 protrudes from the connection surface 52c.

When viewed from the connection surface 52c in a plan view, the pressure gauge 96 is disposed adjacent to the adjustment screw member 78 in the longitudinal direction of the body main body 52 relative to the connection surface 52c. Therefore, when viewed from the connection surface 52c in a plan view, the adjustment screw member 78 is disposed adjacent to the pressure gauge 96 in the longitudinal direction of the body main body 52 relative to the connection surface 52c.

<Action>
Next, the operation of this embodiment will be described.
When the pressure in the secondary flow passage 54 falls below the set pressure, the pressure reducing spring 76 presses the pressure reducing piston 63 against the pressure in the secondary flow passage 54 received by the pressure receiving surface 63a of the pressure reducing piston 63. This causes the pressure reducing valve body 58 to move in a direction away from the valve seat 57. As a result, the pressure reducing valve body 58 is opened. When the pressure reducing valve body 58 is opened, the fluid from the supply flow passage 31 is supplied to the supply port P via the first supply communication flow passage 42, the primary flow passage 53, the pressure reducing valve hole 55, and the secondary flow passage 54. Therefore, the supply flow passage 31 supplies the fluid to the supply port P.

When fluid flows from the primary flow path 53 to the secondary flow path 54 through the pressure reducing valve hole 55, the pressure in the secondary flow path 54 increases. Then, the pressure received by the pressure receiving surface 63a of the pressure reducing piston 63 increases, causing the pressure reducing piston 63 to move toward the spring receiving member 77. Furthermore, the pressure reducing valve body 58 moves toward the valve seat 57 due to the biasing force of the return spring 61. Then, when the pressure in the secondary flow path 54 reaches the set pressure, the pressure reducing valve body 58 seats on the valve seat 57 and the valve is closed. As a result, the pressure in the secondary flow path 54 becomes 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 device via the first output port A, the first output communication passage 44, and the first output passage 32. Then, the pressurized fluid from the fluid pressure device is discharged to the outside via the second output passage 33, the second output communication passage 45, the second output port B, the second exhaust port R2, the second exhaust communication passage 47, and the second exhaust passage 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 device via the second output port B, the second output communication passage 45, and the second output passage 33. Then, the fluid from the fluid pressure device is discharged to the outside via the first output passage 32, the first output communication passage 44, the first output port A, the first exhaust port R1, the first exhaust communication passage 46, and the first exhaust passage 34.

The pressure reducing valve 50 reduces the pressure of the fluid supplied from the primary flow path 53 and outputs it to the secondary flow path 54. As a result, the pressure reducing valve 50 reduces and adjusts the pressure of the fluid output from the solenoid valve 11 to the set pressure. In this way, the pressure reducing valve 50 reduces and adjusts the pressure of the fluid output from the solenoid valve 11 to the set pressure.

<Adjustment of Spring Force of Pressure Reducing Spring 76>
The worker adjusts the spring force of the pressure reducing spring 76 so that the pressure reducing valve body 58 is in a closed state when the pressure in the secondary flow path 54 reaches a set pressure. Specifically, as shown in Fig. 5, first, in a state in which each protrusion 90 is separated from the body 51, a tool 85 is inserted into each insertion groove 84. Then, the adjustment screw member 78 is rotated by the tool 85. This causes the male threaded portion 82 to threadably advance and retract with respect to the female threaded hole 75. As a result, the position of the spring receiving member 77 is adjusted, and the spring force of the pressure reducing spring 76 is adjusted.

The worker adjusts the spring force of the pressure reducing spring 76 by rotating the adjustment screw member 78 while checking the pressure detected by the pressure gauge 96. In this way, the pressure reducing valve 50 reduces and adjusts the pressure of the fluid output from the solenoid valve 11 by reducing and adjusting the pressure in the secondary flow path 54 so that the pressure detected by the pressure gauge 96 becomes the set pressure.

Then, the fixing member 86 is tightened. Specifically, first, the peripheral wall 80 of the adjustment screw member 78 is held from the outside with a tool or by hand. In this state, a tool 95 is inserted into the groove 94 of the fixing nut 88. Then, the tool 95 is used to screw the fixing nut 88 into the female threaded portion 81. At this time, the fixing nut 88 is engaged with the connecting member 87 in a state in which rotation relative to the connecting member 87 is permitted. As a result, the connecting member 87 moves toward the body 51 together with the fixing nut 88 while each protrusion 90 is guided into each insertion hole 83.

As shown in FIG. 3, each protrusion 90 comes into contact with the body 51, so that each protrusion 90 is in surface contact with the body 51. The pressure of each protrusion 90 against the body 51 restricts the rotation of the adjustment screw member 78. This fixes the adjustment screw member 78 to the body 51 via the fixing nut 88 and the connecting member 87. By tightening the fixing member 86 in this way, the adjustment screw member 78 is fixed to the body 51 without shifting its position.

＜Effects＞
The above embodiment can provide the following effects.
(1) A tool 95 is inserted into a groove 94 formed on an operation end surface 88a of the fixing nut 88, and the fixing nut 88 is screwed forward and backward with respect to the female threaded portion 81 by the tool 95. Therefore, the fixing member 86 can be tightened from the same direction as the direction in which the male threaded portion 82 of the adjusting screw member 78 is screwed forward and backward with respect to the female threaded hole 75. Therefore, unlike the conventional technology, it is not necessary to tighten the fixing member 86 from a direction intersecting the direction in which the male threaded portion 82 of the adjusting screw member 78 is screwed forward and backward with respect to the female threaded hole 75. Therefore, even in an environment in which a sufficient working space cannot be secured in a direction intersecting the direction in which the male threaded portion 82 of the adjusting screw member 78 is screwed forward and backward with respect to the male threaded portion 82, the adjusting screw member 78 can be easily fixed to the body 51. Therefore, the workability is improved.

In addition, since the fixed nut 88 is screwed into the female threaded portion 81 on the inside of the peripheral wall 80, the tool 95 can be easily used to screw the fixed nut 88 into and out of the female threaded portion 81 while holding the peripheral wall 80 from the outside of the peripheral wall 80 with a tool or by hand. This makes it easier to prevent the adjustment screw member 78 from rotating together with the fixed nut 88. This makes it difficult for the adjustment screw member 78 to become misaligned. As a result, the pressure in the secondary flow passage 54 can be accurately adjusted to the set pressure while improving workability.

(2) The fixing nut 88 is disposed inside the peripheral wall 80 so that the operating end surface 88a is located closer to the end wall 79 than each insertion groove 84. This makes it possible to avoid a problem in which the tool 85 interferes with the fixing nut 88 when the tool 85 is inserted into each insertion groove 84 and threaded into and out of the female threaded hole 75 in the male threaded portion 82.

(3) When multiple pressure reducing valves 50 are arranged in a row in the direction in which the solenoid valves 11 are arranged in a row corresponding to multiple solenoid valves 11 arranged in a row, it is not possible to ensure sufficient working space in a direction intersecting the direction in which the male threaded portion 82 of the adjustment screw member 78 is screwed forward and backward. Even in such a case, according to this embodiment, the adjustment screw member 78 can be easily fixed to the body 51, improving workability.

<Example of change>
The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

- In an embodiment, for example, the outer peripheral surface of the peripheral wall 80 of the adjustment screw member 78 may have a two-face width shape having a pair of flat surfaces. Then, for example, a wrench may be fitted into the pair of flat surfaces to rotate the adjustment screw member 78 with the wrench. In such a case, the opening end surface of the peripheral wall 80 does not need to have an insertion groove 84 into which the tool 85 can be inserted. Note that, for example, if the insertion groove 84 is not formed on the opening end surface of the peripheral wall 80, it is not necessary for the fixing nut 88 to be disposed inside the peripheral wall 80 such that the operation end surface 88a is located closer to the end wall 79 than each insertion groove 84.

- In an embodiment, for example, the outer peripheral surface of the adjustment screw member 78 may have a knurled surface that has been knurled. Then, an operator may grip the knurled surface by hand and rotate the adjustment screw member 78. In such a case, the insertion groove 84 into which the tool 85 can be inserted may not be formed on the open end surface of the peripheral wall 80.

- In the embodiment, the groove 94 does not have to extend straight in the radial direction of the fixing nut 88, and may be, for example, a hexagonal hole shape. The tip of a hexagonal wrench may be inserted into the groove 94 and the fixing nut 88 may be rotated with the hexagonal wrench to thread the fixing nut 88 forward and backward relative to the female threaded portion 81.

In the embodiment, there is no particular limitation on the number of protrusions 90. The number of insertion holes 83 may be changed as appropriate depending on the number of protrusions 90.
In the embodiment, the nut 74 does not have to be provided on the case 67. For example, the female threaded hole 75 may be formed in the case end wall 68 of the case 67. In short, the pressure reducing valve 50 only needs to be configured to include the female threaded hole 75 provided in the body 51.

- In the embodiment, the pressure reducing valve 50 is not limited to a configuration in which the pressure gauge 96 is arranged adjacent to the adjustment screw member 78 in the longitudinal direction of the main body 52 and against the connection surface 52c.

- In the embodiment, for example, the solenoid valve manifold 10 may be configured to omit the spacer 40. In short, the position of the pressure reducing valve 50 is not particularly limited as long as it is configured to reduce the pressure of the fluid supplied from the primary flow path 53 and direct it to the secondary flow path 54, thereby reducing and adjusting 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 type pilot solenoid valve, but this is not limited thereto, and it may be, for example, a single solenoid type pilot solenoid valve equipped with only one pilot valve.

- In the embodiment, the solenoid valve 11 may be, for example, a four-port solenoid valve in which the second exhaust port R2 is omitted. In short, the solenoid valve 11 only needs to have at least one exhaust port. The solenoid valve 11 may also be a three-port solenoid valve having a supply port, an output port, and an exhaust port.

50...pressure reducing valve, 51...body, 53...primary flow path, 54...secondary flow path, 55...pressure reducing valve hole, 58...pressure reducing valve body, 63...pressure reducing piston, 75...female thread hole, 76...pressure reducing spring, 77...spring receiving member, 78...adjusting screw member, 79...end wall, 80...circumferential wall, 81...female thread portion, 82...male thread portion, 83...insertion hole, 84...insertion groove, 85...tool, 86...fixing member, 87...connecting member, 88...fixing nut, 88a...operating end surface, 90...projection portion, 94...recessed groove.

Claims (2)

a body having a primary flow passage, a secondary flow passage, and a pressure reducing valve hole communicating the primary flow passage and the secondary flow passage;
a pressure reducing valve body that opens and closes the pressure reducing valve hole;
a pressure reducing piston that is capable of reciprocating integrally with the pressure reducing valve body and that receives pressure from the secondary flow path to move the pressure reducing valve body in a valve closing direction;
a pressure reducing spring that biases the pressure reducing piston in a direction in which the pressure reducing valve body opens;
a spring receiving member that receives the pressure reducing spring on an opposite side to the pressure reducing piston in a moving direction of the pressure reducing piston;
A female threaded hole provided in the body;
an adjustment screw member having an externally threaded portion that is screwed into the female threaded hole and abuts against the spring receiving member, and the externally threaded portion is threadedly advanced or retreated relative to the female threaded hole to adjust the position of the spring receiving member and adjust the spring force of the pressure reducing spring;
a fixing member that fixes the adjustment screw member to the body,
A pressure reducing valve that reduces the pressure of a fluid supplied from the primary flow path and delivers the fluid to the secondary flow path,
The adjusting screw member has an end wall and a peripheral wall extending cylindrically from an outer periphery of the end wall,
A female thread portion is formed on the inner peripheral surface of the peripheral wall,
The male thread portion has a columnar shape protruding from a center portion of a surface of the end wall opposite to the peripheral wall,
A plurality of insertion holes are formed around the male thread portion in the end wall,
The fixing member is
a connecting member having a plurality of protrusions that are inserted into the respective insertion holes and protrude from the end walls and are capable of contacting the body;
a fixing nut that is engaged with the connecting member in a state in which rotation with respect to the connecting member is permitted and that is screwed into the female thread portion on the inside of the peripheral wall,
a pressure reducing valve characterized in that an operating end face, which is the end face of the fixing nut facing through the opening in the peripheral wall, is formed with a groove into which a tool can be inserted for threading the fixing nut into and out of the female thread portion. An insertion groove is formed on an open end surface of the peripheral wall into which a tool can be inserted for threading the male thread portion into and out of the female threaded hole,
The pressure reducing valve according to claim 1 , wherein the fixing nut is disposed inside the peripheral wall such that the operation end surface is located closer to the end wall than the insertion groove.

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