JP2002130526A - Operation valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a flow rate of pressure oil supplied to a hydraulic actuator and to improve assemblability while reducing control force of a lever. SOLUTION: While a small-diameter part 1b side is locked with a retainer 4, a sleeve 2 is contacted on an end surface opposed to an end surface of the retainer side of a spring 3. By so ding, complicated process is not required in which a passage conformed to a shape of the large-diameter part 1a of the spool 1 is previously made within a body 5. The spools 1 and 2, spring 3 and retainer 4 can be assembled into the body 5 from a single direction, which leads to easy assembly work of an operation valve 18. Furthermore, such complicated process that a plug is screwed in a pressure oil discharge port of the body 5 is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a control valve. More specifically, the present invention relates to an operation valve capable of increasing the flow rate of pressure oil supplied to a hydraulic actuator and improving assemblability while reducing the operation force of a lever.

[0002]

2. Description of the Related Art An operation valve is used to supply hydraulic oil to a hydraulic actuator in response to operation of a lever.

In this operating valve, there is a demand to increase the flow rate of the pressure oil supplied to the hydraulic actuator while reducing the operating force of the lever.

[0004] Various operating valves have been developed to meet such demands.

[0005] For example, a spool of an operation valve is formed to have a large diameter portion and a small diameter portion having different diameters, and the large diameter portion of the spool is connected to a pressure oil discharge port side of a body from which pressure oil is discharged. There is a prior art in which a spool is arranged such that the small diameter portion is located on the side on which the operating force acts.

In this prior art, since the pressure oil acts on the pressure receiving surface on the small diameter portion side of the spool, the operating force becomes smaller as the diameter of the small diameter portion of the spool is made smaller.

In this prior art, since the pressure oil is pressed by the pressure receiving surface on the large diameter side of the spool and is discharged from the pressure oil discharge port of the body, the pressure oil is discharged from the pressure oil discharge port of the body. The flow rate of the pressure oil increases as the pressure receiving area on the large-diameter portion side of the spool increases.

That is, the flow area of the pressure oil discharged from the pressure oil discharge port of the body is increased by forming the area of the pressure receiving surface of the spool for pressing the pressure oil large.

In this way, it is possible to increase the flow rate of the pressure oil supplied to the hydraulic actuator while reducing the operating force of the lever.

The above prior art is disclosed, for example, in Japanese Utility Model Laid-Open Publication No. Sho 58-66410 as shown in FIG.

In the operating valve 71 shown in FIG.
0, cartridge 61, retaining ring 72, springs 62, 69,
Retainers 63, 64, push rod 73, sleeve 7
4 is formed at the upper part of the body 65 in FIG. In the operation valve 71, a pressure oil discharge port 67 through which pressure oil is discharged is formed at a lower portion of the body 65 in the drawing. Further, in the operation valve 71, a passage 70 is formed in the body 65 in a direction from the insertion port 66 of the body 65 to the pressure oil discharge port 67 of the body 65. And the operating valve 71
In this embodiment, the spool 60 is formed so as to include a large-diameter portion 60a and a small-diameter portion 60b having different diameters. Operation valve 71
The spool 60 is arranged so that the large-diameter portion 60a side of the spool 60 is located on the pressure oil discharge port 67 side of the body 65, and the small-diameter portion 60b side of the spool 60 is located on the insertion port 66 side of the body 65. A part of the large diameter portion 60 a of the spool 60 is slidably accommodated by a cartridge 61.

The spool 60, the cartridge 61, the retaining ring 72, the springs 62 and 69, the retainers 63 and 64, the push rod 73, and the sleeve 74 are housed in a passage 70 in the body 65.

A plug 6 is connected to a pressure oil discharge port 67 of the body 65.
8 is screwed.

That is, the spool 60, the cartridge 61,
The springs 62, 69, the retainers 63, 64, and the push rod 73 are stopped by a plug 68 so as not to fall out of the body 65 in a downward direction in the figure from a passage 70 in the body 65.

An operating valve for increasing the flow rate of pressure oil supplied to a hydraulic actuator while reducing the operating force of a lever is disclosed in Japanese Patent Laid-Open No. 11-2369 as shown in FIG.
No. 05 also discloses.

Also in the operation valve 56 shown in FIG. 6, the spool 50 is formed so as to include a large diameter portion 50a and a small diameter portion 50b having different diameters. In the operation valve 56, the spool is arranged such that the large-diameter portion 50 a of the spool 50 is positioned on the pressure oil discharge port 55 side of the body 53 from which the pressure oil is discharged, and the small-diameter portion 50 b of the spool 50 is positioned on the side on which the operating force acts. 50 are arranged. Further, in the operation valve 56, the body 53 is divided into upper and lower two parts, an upper body 53a that houses the small diameter part 50b side of the spool 50 and a lower body 53b that houses the large diameter part 50a side of the spool 50.

A pressure oil discharge port 55 into which the spool 50 is inserted and from which pressure oil is discharged is formed in a lower portion of the lower body 53b in the drawing. In the lower body 53b, a passage 57 conforming to the shape of the large diameter portion 50a of the spool 50 is formed along the direction in which the spool 50 is inserted into the pressure oil discharge port 55.
Has been processed in advance. Therefore, the spool 50 is inserted only from the pressure oil discharge port 55 of the lower body 53b.

In the operation valve 56, first, the spool 5 is inserted into the passage 57 from the pressure oil discharge port 55 in the lower part of the lower body 53b in the drawing.
Insert 0. Here, the small diameter portion 50b of the spool 50 projects from the upper part of the lower body 53b. Next, spool 5
The springs 51 and 58 and the retainer 52 are arranged on the side of the small diameter portion 50b of the spool 50, and the retainer 52 is brought into contact with the end faces of the springs 51 and 58, and the small diameter portion 5 of the spool 50 is retained by the retainer 52.
The 0b side is locked. Here, a pusher 59 is in contact with the upper surface of the retainer 52. Next, the upper body 53a is assembled into the lower body 53b from the upper side in the figure.

That is, in the operation valve 56, the lower body 53
b, the spool 50 is incorporated in the passage 57 from the lower side, and the springs 51, 58, the retainer 52, the pusher 5 are mounted on the small diameter portion 50b of the spool 50 from above the lower body 53b.
9. The upper body 53a is incorporated.

[0020]

Problems to be Solved by the Invention
No. 0, when assembling the operation valve 71, the body 6
A complicated process of screwing the plug 68 into the pressure oil discharge port 67 of the fifth embodiment becomes necessary.

In Japanese Patent Application Laid-Open No. 11-236905, when assembling the operation valve 56, a passage 5 is formed in the lower body 53b so as to conform to the shape of the large diameter portion 50a of the spool 50.
7 requires a complicated process of processing it in advance.

In the operating valve 56, the springs 51, 5 are attached to the small diameter portion 50b of the spool 50 from above the lower body 53b.
8. In addition to incorporating the retainer 52, the pusher 59, and the upper body 53a, the spool 50 is incorporated into the passage 57 from below the lower body 53b. , 58,
Since it is necessary to incorporate the retainer 52, the pusher 59, the upper body 53a, and the spool 50, the operation of assembling the operation valve 56 becomes complicated.

Accordingly, the operation valves disclosed in these publications have a problem that the assemblability is reduced.

An object of the present invention is to increase the flow rate of pressure oil supplied to a hydraulic actuator and to improve the assemblability while reducing the operating force of a lever.

[0025]

According to the first aspect of the present invention, in order to achieve the above object, a spool (1), a sleeve (2), a spring (3), and a retainer (4) are provided. Is formed in the body (5), and a pressure oil is discharged to the opposite side of the insertion port (6) of the body (5). A discharge port (7) is formed in the body (5), and a passage (17) is formed in the direction from the insertion port (6) of the body (5) to the pressure oil discharge port (7) of the body (5). (5)
Formed in the spool (1) and the sleeve (2)
And the spring (3) and the retainer (4) are accommodated in a passage (17) in the body (5), and the spool (1)
Are formed to have a large diameter portion (1a) side and a small diameter portion (1b) side having different diameters, and the large diameter portion (1) of the spool (1) is formed.
a) side is located on the side of the pressure oil discharge port (7) of the body (5), and the small diameter portion (1b) side of the spool (1) is located on the side of the insertion port (6) of the body (5). The spool (1) is arranged, and the large-diameter portion (1
a) side is slidably received by the sleeve (2), and the retainer (4) is disposed on the small-diameter portion (1b) side of the spool (1), and the retainer (4) is connected to the spring (3). An operation valve for discharging pressure oil from a pressure oil discharge port (7) of the body (5) by moving the spool (1) in accordance with the expansion and contraction operation of the spring (3). The small diameter portion (1b) side of the spool (1) is locked by the retainer (4), and the end face of the spring (3) facing the retainer (4) side is brought into contact with the sleeve (2). It is characterized by contact. The first invention will be described with reference to FIG.

According to the first aspect, the small diameter portion 1b of the spool 1 is locked by the retainer 4 and the end face of the spring 3 facing the end face of the spring 4 is brought into contact with the sleeve 2. This eliminates the need for a complicated step of forming a passage in the body 5 in advance according to the shape of the large diameter portion 1a of the spool 1. In addition, since the spool 1, the sleeve 2, the spring 3, and the retainer 4 can be incorporated into the body 5 from one direction, the assembling work of the operation valve 18 is simplified. Further, a complicated step of screwing a plug into the pressure oil discharge port 7 of the body 5 is not required.

Therefore, in the first invention, it is possible to increase the flow rate of the pressure oil supplied to the hydraulic actuator and to improve the assemblability while reducing the operating force of the lever.

According to a second aspect of the present invention, in order to achieve the above object, the first spring (42) and the spool (4
0), a shaft (41), a sleeve (2), a second spring (3), and a retainer (4) are formed in the body (5) with an insertion opening (6) through which the body (5) is inserted. At the same time, a pressure oil discharge port (7) for discharging pressure oil is formed in the body (5) on the opposite side of the insertion port (6) of the body (5), and the insertion port ( A passage (17) is formed in the body (5) in the direction from 6) to the pressure oil discharge port (7) of the body (5), and the first spring (42), the spool (40), The shaft (41), the sleeve (2), the second spring (3), and the retainer (4) are accommodated in a passage (17) in the body (5), and the diameter of the spool (40) is reduced. The shaft (41)
The spool (40) is formed so as to be larger than the diameter of the body (5), the spool (40) is located on the side of the pressure oil discharge port (7) of the body (5), and the shaft (41) is located on the body (5). The spool (40) and the shaft (41) are arranged so as to be located on the side of the insertion port (6), and the spool (40) and the shaft (41) are brought into contact with each other.
The end surface of the first spring (42) is brought into contact with the end surface of the spool (40) facing the shaft (41) side, and the spool (40) is slidably received by the sleeve (2). Then, the retainer (4) is disposed on the shaft (41), and the retainer (4) is brought into contact with an end face of the second spring (3), and the first spring (42)
By moving the spool (40) and the shaft (41) according to the expansion and contraction operation of the second spring (3) and the second spring (3), the pressure oil is discharged from the pressure oil discharge port (7) of the body (5). In the discharge operation valve, the shaft (41) is locked by the retainer (4), and an end surface of the second spring (3) facing the end surface on the retainer (4) side is abutted against the sleeve (2). Contact and keep it from coming off (4
4) is provided along the inner wall of the passage (17) in the body (5), and the stopper (44) is applied to an end face of the first spring (42) facing the spool (40) side. It is characterized by contact.

The second invention will be described with reference to FIG.

According to the second aspect, the head 41c of the shaft 41 is locked by the retainer 4, and the end face of the second spring 3 facing the end face on the retainer 4 side is brought into contact with the sleeve 2 and is prevented from coming off. 44 is provided along the inner wall of the passage 17 of the body 5 so that the stopper 44 abuts on the end face of the first spring 42 that faces the end face on the spool 40 side. This eliminates the need for a complicated process of forming a passage in the body 5 according to the shape of the spool 40 in advance. Further, since the spring 42, the spool 40, the shaft 41, the sleeve 2, the spring 3, and the retainer 4 can be incorporated into the body 5 from one direction, the assembly work of the operation valve 18 is simplified. Further, a complicated step of screwing a plug into the pressure oil discharge port 7 of the body 5 is not required.

Therefore, in the second invention, the same effects as in the first invention can be obtained.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an operation valve according to the present invention will be described below.

FIG. 1 shows an operating valve 1 according to a first embodiment of the present invention.
8 is a sectional view of FIG.

In the upper part of the body 5 in the figure, a spool 1, a sleeve 2, an operation spring 3, a pressure setting spring 8, a retainer 4, a collar 9, a lower part 10b of a piston 10, and a seal 14 are provided inside the body 5. An insertion slot 6 for insertion is formed.

On the other hand, a pressure oil discharge port 7 through which pressure oil is discharged is formed in a lower portion of the body 5 in the drawing.

A passage 17 is formed inside the body 5 in a direction from the insertion port 6 to the pressure oil discharge port 7.

In the passage 17, the spool 1, the sleeve 2, the operating spring 3, the operating spring 3 or the operating spring 3 or the pressure setting spring 8, the retainer 4, the lower part 10b of the piston 10 and the seal 14 are arranged in this order. Pressure setting spring 8, retainer 4, piston lower part 10b of piston 10,
The seal 14 is housed. The collar 9 may be housed between the time when the sleeve 2 is housed and the time when the seal 14 is housed.

A pump oil passage 11 for supplying pressure oil from a pump (not shown) into the passage 17 is formed inside the body 5.

A tank oil passage 16 for discharging the pressure oil in the passage 17 to a tank (not shown) is formed inside the body 5.

The spool 1 is formed to have a large diameter portion 1a and a small diameter portion 1b having different diameters.

The spool 1 is arranged such that the large-diameter portion 1a is located on the pressure oil discharge port 7 side of the body 5 and the small-diameter portion 1b is located on the insertion port 6 side of the body 5.

The large diameter portion 1a side of the spool 1 is slidably accommodated by a sleeve 2. This eliminates the need for a complicated process of forming a passage in the body 5 according to the shape of the large-diameter portion 1a of the spool 1 in advance as in the related art. Also, a spool 1, a sleeve 2, an operation spring 3, a pressure setting spring 8, a retainer 4, a piston 10, a seal 1,
4. Since the collar 9 can be incorporated into the body 5 from one direction, the operation of assembling the operation valve 18 is simplified.

A hydraulic chamber 15 is formed by the surface of the portion where the large diameter portion 1a and the small diameter portion 1b of the spool 1 are joined and the inner wall surface of the sleeve 2.

On the peripheral surface of the small diameter portion 1b of the spool 1, a step portion 1e is formed along the peripheral surface. The lowered retainer 4 comes into contact with the step portion 1e. A spring seat 1d is formed below the step portion 1e along the peripheral surface of the small diameter portion 1b of the spool 1 in the figure.

The lower end surface of the pressure setting spring 8 is in contact with the spring seat 1d of the spool 1.

An operation spring 3 is arranged around the small diameter portion 1b of the spool 1.

The lower end surface of the operating spring 3 is in contact with the upper end surface of the sleeve 2.

A piston lower part 10b of the piston 10 is arranged around the operating spring 3.

A collar 9 is arranged around a lower portion 10b of the piston 10.

The lower surface of the retainer 4 is in contact with the upper end surfaces of the operating spring 3 and the pressure setting spring 8.

The retainer 4 locks the head 1c on the small diameter portion 1b side of the spool 1.

As a result, the spool 1 moves upward in the drawing as the retainer 4 is raised.

The piston 10 is in contact with the upper surface of the retainer 4.

The retainer 4 descends as the piston 10 is pressed downward in the drawing.

When the retainer 4 is lowered, it comes into contact with the step portion 1e on the small diameter portion 1b side of the spool 1.

Therefore, as the retainer 4 is lowered, the spool 1 moves downward in the figure.

A seal 14 is in contact with the upper surface of the piston lower part 10b of the piston 10.

The seal 14 is arranged along the insertion opening 6 of the body 5.

The upper part 10a of the piston 10 projects from the insertion opening 6 of the body 5.

The mounting plate 12 is mounted on the upper part of the body 5 so that the upper part 10a of the piston 10 is inserted into the mounting hole 12a.

The tilting device 13 is attached to the upper part of the body 5 so as to contact the upper part 10a of the piston 10.

Next, the structure of the retainer 4 will be described in detail.

FIG. 2A is a top view of the retainer 4.
FIG. 2B is a sectional view taken along line AA of FIG.

The spool 4 has a small-diameter portion 1 b of the spool 1.
A large diameter hole 4b having a diameter larger than that of the head 1c on the side is formed so as to be unevenly distributed from the center of the retainer 4.

The large diameter hole 4b of the retainer 4 is formed with a notch 4a located substantially at the center of the retainer 4.

Next, a procedure for locking the small-diameter portion 1b of the spool 1 by the retainer 4 will be described.

FIGS. 3A and 3B are views showing a state where the small diameter portion 1b side of the spool 1 is locked by the retainer 4. FIG.

First, as shown in FIG. 3A, the retainer 4 is lowered while the upper end surfaces of the operating spring 3 and the pressure setting spring 8 are in contact with the lower surface of the retainer 4. Then, the operating spring 3 and the pressure setting spring 8 are compressed downward in the drawing, and the small diameter portion 1b of the spool 1 is inserted into the large diameter hole 4b of the retainer 4.
Side head 1c is inserted.

Next, as shown in FIG. 3B, the retainer 4 is moved in the radial direction, and the head 1c on the small diameter portion 1b side of the spool 1 is locked by the notch 4a of the retainer 4. As a result, the retainer 4 can be assembled so as to be substantially concentric with the spool 1, and the retainer 4 can prevent the spool 1 from falling down in the drawing.

That is, the head 1c on the small-diameter portion 1b side of the spool 1 is locked by the retainer 4, and the lower end surface of the operating spring 3 is in contact with the upper end surface of the sleeve 2. Using a plug, spool 1, operating spring 3, pressure setting spring 8, retainer 4, piston 1
There is no need to keep 0 from falling out. That is, the complicated step of screwing a plug into the pressure oil discharge port 7 of the body 5 is not required.

Next, the operation of the operation valve 18 of the first embodiment will be described.

The tilting operation of the lever is performed, and the tilting device 13 is moved.
When the piston 10 is pressed downward in the drawing, the retainer 4 is lowered, and the operating spring 3 and the pressure setting spring 8
Are compressed downward in the figure.

When the retainer 4 is further lowered, it comes into contact with the step portion 1e of the small diameter portion 1b of the spool 1.

The spool 1 is moved downward in the figure by the lowering of the retainer 4 abutting on the step portion 1e of the small diameter portion 1b of the spool 1 and the hydraulic pressure acting in the hydraulic chamber 15.

As a result, the pressure oil supplied to the passage 17 of the body 5 via the pump oil passage 11 is pressed by the pressure receiving surface on the large diameter portion 1a side of the spool 1 and discharged from the pressure oil discharge port 7 of the body 5. Is done.

As described above, according to the first embodiment, the head 1c on the small diameter portion 1b side of the spool 1 by the retainer 4
And the lower end surface of the spring 3 is in contact with the upper end surface of the sleeve 2. This eliminates the need for a complicated step of forming a passage in the body 5 in advance according to the shape of the large diameter portion 1a of the spool 1. Further, the spool 1, the sleeve 2, the operating spring 3, the pressure setting spring 8, the retainer 4, the piston 10, the seal 14, and the collar 9 can be incorporated into the body 5 from one direction, so that the assembling work of the operating valve 18 is simplified. Become. Further, a complicated step of screwing a plug into the pressure oil discharge port 7 of the body 5 is not required.

Therefore, in the first embodiment, it is possible to increase the flow rate of the pressure oil supplied to the hydraulic actuator and to improve the assemblability while reducing the operating force of the lever.

In the operation valve 18 shown in FIG. 1, the spool 1 is formed so that the large diameter portion 1a and the small diameter portion 1b are integrated, but the spool 1 is formed by the large diameter portion 1a and the small diameter portion 1b. They may be formed separately.

FIG. 4 shows a control valve 1 according to a second embodiment of the present invention.
It is sectional drawing of 8 '. Note that the same components as those in FIG. 1 described above are denoted by the same reference numerals, and description of these components will be omitted as appropriate. 4 corresponds to the large diameter portion 1a of the spool 1 in FIG. Further, the shaft 41 in FIG. 4 corresponds to the small diameter portion 1b of the spool 1 in FIG.

In the operation valve 18 'shown in FIG.
And the upper end surface of the spool 40 are in contact with each other.

A spring 42 is disposed below the spool 40 in the drawing.

In the operation valve 18 ', a stopper 44 is provided along the lower inner wall of the passage 17 of the body 5 in the figure.

Accordingly, the spool 4 is provided on the upper end surface of the spring 42.
0 is in contact with the lower end surface of the spring 42, and
4 is in contact.

For this reason, in the operation valve 18 ', before the spool 40 is accommodated by the passage 17, first, the stopper 44 is accommodated, and then the spring 42 is accommodated.

According to the operation valve 18 ', the spring 42 expands and contracts in accordance with the movement of the spool 40.

That is, according to the expansion and contraction of the spring 42, the spool 4
By moving 0, the lower end surface of the shaft 41 and the upper end surface of the spool 40 are always in contact, so that the spool 40 is moved according to the movement of the shaft 41.

As described above, in the second embodiment, the head 41c of the shaft 41 is locked by the retainer 4, the lower end of the spring 3 is brought into contact with the upper end of the sleeve 2, and the lower end of the spool 40 is A stopper 44 is provided along the inner wall of the passage 17 of the body 5 so that the stopper 44 contacts the lower end surface of the spring 42. This eliminates the need for a complicated process of forming a passage in the body 5 according to the shape of the spool 40 in advance. Also, a spring 42, a spool 40, a shaft 4
The operating valve 18 can be assembled into the body 5 from one direction, including the sleeve 1, the operating spring 3, the pressure setting spring 8, the retainer 4, the piston 10, the seal 14, and the collar 9.
Assembly work is simplified. Further, a complicated step of screwing a plug into the pressure oil discharge port 7 of the body 5 is not required.

Therefore, also in the second embodiment, similarly to the first embodiment, while reducing the lever operating force,
The flow rate of the pressure oil supplied to the hydraulic actuator can be increased, and the assemblability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an operation valve according to a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams illustrating a configuration example of a retainer.

FIGS. 3A and 3B are views showing a state in which a small-diameter portion side of a spool is locked by a retainer.

FIG. 4 is a sectional view of an operation valve according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a conventional technique.

FIG. 6 is a diagram showing a conventional technique different from FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spool 2 ... Sleeve 3 ... Operating spring 4 ... Retainer 5 ... Body 6 ... Insertion port 7 ... Pressure oil discharge port 17 ... Passageway

Claims (2)

[Claims] An insertion opening (6) through which a spool (1), a sleeve (2), a spring (3), and a retainer (4) are inserted into a body (5) is formed in the body (5). At the same time, a pressure oil discharge port (7) through which pressure oil is discharged to the opposite side of the insertion port (6) of the body (5) is connected to the body (5)
And a passage (17) is formed in the body (5) in a direction from the insertion port (6) of the body (5) to the pressure oil discharge port (7) of the body (5), and the spool ( 1), the sleeve (2), the spring (3), and the retainer (4) are accommodated in a passage (17) in the body (5), and the spool (1) has a large diameter portion ( 1a) and a small-diameter portion (1b), and the large-diameter portion (1a) of the spool (1) is on the side of the pressure oil discharge port (7) of the body (5). 1) Small diameter part (1b)
The spool (1) is arranged such that a side of the spool (1) is positioned on an insertion port (6) side of the body (5),
Of the spool (1) is slidably accommodated by the sleeve (2), the retainer (4) is disposed on the small-diameter portion (1b) side of the spool (1), and the retainer (4) is Pressure oil is discharged from the pressure oil discharge port (7) of the body (5) by bringing the spool (1) into contact with the end face of the spring (3) and moving the spool (1) in accordance with the expansion and contraction operation of the spring (3). In the operation valve for discharging, the small-diameter portion (1b) side of the spool (1) is locked by the retainer (4), and the end surface of the spring (3) facing the retainer (4) side is connected to the sleeve. (2) An operation valve, which is brought into contact with (2). 2. A first spring (42) and a spool (4).
0), a shaft (41), a sleeve (2), a second spring (3), and a retainer (4) are formed in the body (5) with an insertion opening (6) through which the body (5) is inserted. At the same time, a pressure oil discharge port (7) for discharging pressure oil is formed in the body (5) on the opposite side of the insertion port (6) of the body (5), and the insertion port ( A passage (17) is formed in the body (5) in the direction from 6) to the pressure oil discharge port (7) of the body (5), and the first spring (42), the spool (40), The shaft (41), the sleeve (2), the second spring (3), and the retainer (4) are accommodated in a passage (17) in the body (5), and the diameter of the spool (40) is reduced. The spool (40) is formed so as to be larger than the diameter of the shaft (41). 0) is located on the side of the pressure oil discharge port (7) of the body (5), and the shaft (41) is located on the side of the insertion port (6) of the body (5). A shaft (41) is arranged, and the spool (40) is brought into contact with the shaft (41);
The end surface of the first spring (42) is brought into contact with the end surface of the spool (40) facing the shaft (41) side, and the spool (40) is slidably received by the sleeve (2). Then, the retainer (4) is disposed on the shaft (41), and the retainer (4) is brought into contact with an end face of the second spring (3), and the first spring (42)
By moving the spool (40) and the shaft (41) according to the expansion and contraction operation of the second spring (3) and the second spring (3), the pressure oil is discharged from the pressure oil discharge port (7) of the body (5). In the operation valve for discharging, the shaft (41) is locked by the retainer (4), and an end surface of the second spring (3) facing the end surface on the retainer (4) side is brought into contact with the sleeve (2). The first spring (42) is provided along the inner wall of the passage (17) in the body (5) together with the first spring (42).
An operating valve characterized in that the stopper (44) is brought into contact with an end surface facing an end surface of the spool (40).