KR20140033910A

KR20140033910A - Breaker valve assembly

Info

Publication number: KR20140033910A
Application number: KR1020120100439A
Authority: KR
Inventors: 이의명; 박재용
Original assignee: 박재용
Priority date: 2012-09-11
Filing date: 2012-09-11
Publication date: 2014-03-19

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a covalent pressure breaker valve structure, comprising: a covalent pressure breaker valve structure installed in a valve chamber (VR) to divert fluid flow, the valve chamber (VR) being inserted into and installed on both sides thereof. A valve sleeve that is provided, a valve spool which is installed to be interviewed and movable inside the valve sleeve 100 and has an open shape on both sides thereof, and a valve plug that is connected to the other end of the valve sleeve. It relates to a covalent pressure breaker valve structure characterized in that it comprises a.
According to the present invention, the valve spool has a fully open configuration so that the vertical operation of the valve is smooth and the operating speed is high, as well as the hydraulic pulsation can be reduced by such a high valve operating speed. .
In addition, the hydraulic pressure flowing into the valve sleeve is applied relatively uniformly through each step surface, so that the high pressure hydraulic pressure applied to the outer periphery of the valve spool operates relatively symmetrically with respect to the central axis of the valve spool. The friction between the outer circumferential surface of the valve sleeve and the inner circumferential surface of the valve sleeve enables smooth sliding motion and reduces the wear and scratch caused by the friction.

Description

Co-Pressure Breaker Valve Structure {Breaker Valve Assembly}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a covalent pressure breaker valve structure, comprising:

Inserted and installed in the valve chamber VR, both sides are open, the first stepped surface 111, the second stepped surface 112 and the third stepped surface 113 from one side to the other side along the outer peripheral surface 113 ) Are sequentially formed, and the first stepped surface 111, the second stepped surface 112, and the third stepped surface 113 are respectively two or more first through holes 121 and second through A hole 122 and a third through hole 123 are formed, and the inner circumferential surface thereof is disposed at positions corresponding to the first stepped surface 111, the second stepped surface 112, and the third stepped surface 113, respectively. A valve sleeve 100 having a first internal step surface 131, a second internal step surface 132, and a third internal step surface 133;

Interviewed inside the valve sleeve 100 is installed to be movable, both sides have an open form,

The first small diameter portion 210,

Large diameter portion 220 formed on the other side of the first small diameter portion 210,

A second small diameter portion 230 formed at the other side of the large diameter portion 220;

A first annular groove 240 and a second annular groove 250 formed on the outer circumferential surface of the first small diameter portion 210 in order from the one side to the other side, respectively;

A third annular groove 260 formed on an outer circumferential surface of the stepped portion where the first small diameter portion 210 and the large diameter portion 220 meet each other,

A valve spool 200 including at least two through holes 270 formed in the first annular groove 240;

The valve plug 300 is installed in contact with the other end of the valve sleeve 100, the one end portion connected to the valve sleeve 100 is formed with two or more plug passage hole 320 along the outer peripheral surface of the valve plug 300 ; Characterized in that comprises a,

The first stepped surface 111a communicates with the third chamber 44 through the passage P1,

The second stepped surface 111b communicates with the return passage P2 and the fluid outlet 22.

The third stepped surface 111c is in communication with the second chamber 46,

The plug recess groove 310 relates to a co-pressure breaker valve structure, characterized in that in communication with the return passage (58).

In general, a breaker (BREAKER) is exposed to the outside by hitting the head of the chisel (CHISEL) is a vertically reciprocating movement in a certain area by the power of the hydraulic or pneumatic acting intermittently act on the upper surface of the piston. It is a mechanism that allows the tip of the chisel to be crushed while the crushed object is in contact with it.

For example, as illustrated in FIG. 1, the breaker is filled with a compressed gas such as nitrogen gas and injected into the gas chamber 5 formed at the upper end of the piston 7 in the cylinder 1, and at the lower end of the piston 7 a chisel ( The head of 3) is mounted coaxially to be in contact with the piston 7, and the pressure state of the fluid supplied in this state is switched by the control valve installed in the valve chamber VR to lift the piston 7. In this case, the expansion force of nitrogen gas in the gas chamber 5 is converted into hammering energy striking the head of the chisel 3 through the piston 7, and the rock, concrete, etc., which are in contact with the tip thereof. And configured to crush the hardness crushed object.

Examples of such a breaker are well known, for example, Patent No. 10-0078639 ([A blow mechanism using gas and hydraulic pressure] as described in the prior art Patent Document 1) has a high-pressure fluid through-hole formed in the outer peripheral portion of the valve Without opening, the inlet of the passage connecting the rear annular chamber formed in the upper part of the piston and the through hole formed in the valve is directly opened and closed.When the piston reaches the top dead center while compressing the gas chamber, the outer peripheral surface of the spool (SPOOL) The high pressure fluid flows into the valve switching chamber formed by the inner circumferential surface, and the high pressure fluid directly pushes the spool in the valve to open the through hole formed in the valve, thereby immediately switching the rear annular chamber formed on the piston to the high pressure side. Configuration to maximize the energy and increase the hit energy at the same time .

2 and 3, the existing invention described in the above-mentioned Patent Document 1 has a "loading rod 1 and the above; which receives the lower end of the piston from one end and is coaxially disposed with the piston from the other end. The back head is used to form the gas chamber and the front head 10 for defining the stroke length and stroke direction of the copper piston and the striking rod, which accommodates the striking rod, and the cylinder 20 equipped with the piston and valve system. In the striking mechanism using the gas and hydraulic pressure provided with (30),

The striking mechanism is defined by (a) a first chamber 43 in which a piston chamber for accommodating a piston is connected to a pressure line via a lower fluid passage 47, and defined by an intermediate stepped portion 45 of the piston. A second chamber 46 operatively connected to the second chamber 46, a third chamber 44 operatively connected to the pressure line, defined by the stepped portion 42 formed on the piston, and at the top of the piston A piston 40 having large and small stepped portions along the longitudinal direction to be divided into a fourth chamber 60 defining a gas chamber formed to be separated from the third chamber,

(b) a valve chamber (50) disposed in parallel with said piston chamber for receiving a valve system;

(c) a switching passage P3 for converting the pressure line of the fluid into the discharge line and operatively connecting the valve chamber 50 with the second chamber 46;

(d) a discharge passage (p2) for discharging the waste fluid converted to the depressurized state after the piston lowering operation,

(e) a lower fluid passage (47) for supplying a high pressure fluid from the fluid inlet (21) to the first chamber (43);

(f) an upper fluid passage 48 branched from the lower fluid passage 47 for supplying a high pressure fluid from the fluid inlet 21 to the valve chamber 50 and the magnetic pressure space 81;

(g) a passage p1 for operatively communicating the valve chamber 50 with the third chamber 44 in accordance with the valve switching.

In particular in the construction of a valve structure consisting of a valve sleeve-valve spool-valve plug,

" (a) the outer diameter of the same size as the inner diameter of the valve chamber,

An inner diameter slightly larger than the diameter of the upper fluid passage 48,

A through hole (71) drilled in the lower central portion at the same size as the diameter of the upper fluid passage;

An annular stepped surface 72 formed on the inner circumferential surface of the lower end so as to accommodate the lower end of the spool as perturbation material;

First and second annular grooves 73 and 74 formed on the inner peripheral surface of the central portion,

And a hollow cylindrical valve 70 formed by forming an annular step surface 75 formed on the inner circumferential surface of the upper end to accommodate the large diameter portion of the spool as perturbation material.

Here, several through holes are formed on the first annular groove 73 at equal circumferential intervals, and one of the through holes 76 communicates with the third chamber 44 through a passage P1.

Several through holes are formed on the second annular groove 74 at equal intervals in the circumferential direction, and one of the through holes 77 is connected to the return passage P2, and is opposite to the through holes 77. Another through hole 78 is in communication with the fluid discharge port 22, a plurality of through holes are formed in the annular step surface 75 at equal intervals in the circumferential direction, one of the through holes 79 is the second It is connected with the conversion path P3 arranged to communicate with the chamber 46;

(b) the large neck portion 95,

Small diameter part 94,

An axial opening 91 formed at a lower end of the upper fluid passage 48 with a diameter the same as that of the upper fluid passage 48;

An upper blocking plate 99 having several axial holes 93 at circumferential equal intervals,

A cylindrical portion 96 projecting outward from the center of the blocking plate so as to be inserted into the axial hole 86 in the valve cover;

And a spool (90) mounted in the valve (77) with an annular groove (97, 98) formed on the outer circumferential surface of the small diameter portion and the outer circumferential surface of the step portion where the large diameter portion and the small diameter portion meet ;

And

(c) a cylindrical recess 81 whose inner diameter is the same as the outer diameter of the large diameter portion of the spool 90,

An axial hole 86 communicating with the center of the recess such that the protruding cylindrical portion 96 of the spool is fitted with perturbation material;

An annular groove 85 formed on the outer circumferential surface,

And a valve cover (80) having an inclined passage (83) connecting the annular groove (85) and the low pressure chamber (84 ); "

A configuration comprising a is disclosed.

However, in these examples, excessive expansion force by hydraulic pressure is applied to the outer circumferential surface and the sliding outer circumferential surface of the cylindrical switching valve spout so that their smooth interaction cannot be induced, and thus scratches are generated on the entire outer circumferential surface of the valve spline. As a result, it acts as a factor that hampers the hammering energy of the piston, thereby overlooking the problem of shortening the life of the breaker. In addition, in the process of opening and closing action, the valve spline does not respond smoothly to the flow of fluid and hydraulic pressure, so that the outer circumferential surface and the entire sliding surface of the inner circumferential surface of the valve sleeve are interlocked to generate scratches on the outer and inner circumferential surfaces of the sliding motion. It also ignores the disadvantage that the hammering function of the valve spline is restricted and the hammering function is weakened.

In particular, the area of the second pressure receiving surface determined by the upper blocking plate 99 is excessive compared to the area of the first pressure receiving surface determined by one end of the axial opening 91 side of the spool 90. Too large, (second pressure side surface >> first pressure surface) excessive pressure is required for the valve spool to rise, thereby increasing the operating pressure and lowering the speed of the valve spool, thereby completely opening the through hole 71 of the valve sleeve. There is a big disadvantage that the impact force and speed is lowered because it is not open because sufficient flow rate does not pass.

Patent Document 1: Registered Patent 10-0078639

The present invention solves the problems of the existing invention described above, the valve spool is open to both sides of the valve is fully open, smooth operation up and down the valve speed, as well as lower the hydraulic pulsation by such a fast valve operating speed An object of the present invention is to provide a covalent pressure breaker valve structure that can be used.

In addition, the hydraulic pressure flowing into the valve sleeve is applied relatively uniformly through each step surface, so that the high pressure hydraulic pressure applied to the outer periphery of the valve spool operates relatively symmetrically with respect to the central axis of the valve spool. It is an object of the present invention to provide a covalent pressure breaker valve structure capable of smooth sliding motion by reducing friction between the outer circumferential surface of the valve sleeve and the inner circumferential surface of the valve sleeve and reducing the occurrence of abrasion or scratches caused by friction.

In order to achieve the above object, the present invention, in the covalent pressure breaker valve structure provided in the valve chamber (VR) to redirect the fluid flow,

The first small diameter portion 210,

A valve spool 200 including two or more through-holes 270 formed in the first annular groove 240;

It is installed in contact with the other end of the valve sleeve 100, the one end portion connected to the valve sleeve 100 is formed with a plug recess groove 310 along its outer peripheral surface, the plug recess groove 310 ) Valve plug 300 having two or more plug through holes 320 are formed; Characterized in that comprises a,

The third stepped surface 111c is in communication with the second chamber 46,

The plug recess groove 310 is characterized in that it is in communication with the return passage (58).

In addition, the first hydraulic pressure surface 201 formed at the one end of the valve sleeve 100 and the second hydraulic pressure surface 202 formed at the other end of the valve sleeve 100 are the first hydraulic pressure surface 201. ) Is equal to or larger than that of the second pressure receiving surface 202.

In addition, the area of the first pressure receiving surface 201 is the area of the second pressure receiving surface 202, the ratio of the area (first pressure receiving surface 201 / second pressure receiving surface 202) is 1.0 to 1.5 It is characterized by having a ratio.

In addition, at least one of the first pressure receiving surface 201 or the second pressure receiving surface 202 is characterized in that a plurality of joining grooves 203 are formed, respectively.

In addition, the plug passage hole 320 is characterized in that it is formed to have a semi-circular shape open to the one end portion of the valve plug 300.

According to the present invention, the valve spool has a fully open configuration so that the vertical operation of the valve is smooth and the operating speed is high, as well as the hydraulic pulsation can be reduced by such a high valve operating speed. .

In addition, the hydraulic pressure flowing into the valve sleeve is applied relatively uniformly through each step surface, so that the high pressure hydraulic pressure applied to the outer periphery of the valve spool operates relatively symmetrically with respect to the central axis of the valve spool. The friction between the outer circumferential surface of the valve sleeve and the inner circumferential surface of the valve sleeve enables smooth sliding motion and reduces the wear and scratch caused by the friction.

1 is an exemplary cross-sectional view of a breaker according to the prior art.
2 is a cross-sectional view of the breaker with the valve structure of the present invention in the striking operation.
3 is a cross-sectional view of the breaker with the valve structure of the present invention in the ascending operation.
4 is a cross-sectional view of the breaker with the valve structure of the present invention in maximum raising operation.
5 is an exploded perspective view of a co-pneumatic breaker valve structure according to an embodiment of the present invention.
6 is a perspective view of a valve sleeve of a co-pneumatic breaker valve structure according to an embodiment of the present invention.
7 is a perspective view of a valve spool of a co-pneumatic breaker valve structure according to an embodiment of the present invention.
8: A perspective view of a valve plug of a co-pneumatic breaker valve structure according to one embodiment of the present invention.
9 is a cross-sectional view of a valve sleeve of a co-pneumatic breaker valve structure according to one embodiment of the present invention.
10 is a cross-sectional view of a valve spool of a co-pneumatic breaker valve structure according to an embodiment of the present invention.
11 is a cross-sectional view of a valve plug of a co-pneumatic breaker valve structure according to one embodiment of the present invention.
12 is a cross-sectional view of the co-pneumatic breaker valve structure in the striking operation according to an embodiment of the present invention.
13: Cross-sectional view in the ascending operation of the co-pneumatic breaker valve structure according to the embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the covalent pressure breaker valve structure according to an embodiment of the present invention. First, it should be noted that, in the drawings, the same components or parts are denoted by the same reference numerals whenever possible. In describing the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

The present invention includes a valve sleeve 100, a valve spool 200, and a valve plug 300 as shown in FIG. 5.

First, the valve sleeve 100 will be described. The valve sleeve 100 is inserted into the valve chamber VR as shown in FIGS. 5 and 12. 6 and 9, both sides of the valve sleeve 100 are open, and the first stepped surface 111, the second stepped surface 112, and the first stepped from one side to the other side along the outer circumferential surface thereof. The three stepped surfaces 113 are sequentially formed.

Meanwhile, as shown in FIGS. 5 and 12, the valve sleeve 100 is sequentially disposed on the first stepped surface 111, the second stepped surface 112, and the third stepped surface 113, respectively. At least one first through hole 121, a second through hole 122, and a third through hole 123 are formed on the inner circumferential surface of the first stepped surface 111, the second stepped surface 112, and The first internal stepped surface 131, the second internal stepped surface 132, and the third internal stepped surface 133 are formed at positions corresponding to the third stepped surface 113, respectively.

In this case, the first stepped surface 111, the second stepped surface 112, and the third stepped surface 113 may be used interchangeably with the valve structure of the patent document 1 in the co-pneumatic breaker valve structure of the present invention. In order to be able to make it possible, it is preferable to form sequentially in the position corresponding to each through hole 76, 77, 79 of the valve structure of the said patent document 1.

The first stepped surface 111, the second stepped surface 112, and the third stepped surface 113 allow the flow of fluid from each fluid passage formed in the valve room VR d. Since the through holes 76, 77, and 79 of the valve structure of Patent Document 1 perform the same or similar functions, the first stepped surface 111a is the same as that of the valve structure of Patent Document 1 in FIG. It is preferable to be in communication with the third chamber 44 through the passage (P1) shown.

In addition, the second stepped surface 111b communicates with the return passage P2 and the fluid outlet 22 shown in FIG. 2 as in the valve structure of Patent Document 1, and the third stepped surface 111c is It is preferable to make it communicate with the 2nd chamber 46 shown in FIG. 2 like the valve structure of the said patent document 1. As shown in FIG.

In this case, the detailed structure regarding the said passage P1, the 3rd chamber 44, the return passage P2, the fluid discharge port 22, and the 2nd chamber 46 is the valve which this invention disclosed in the said patent document 1 In order to be compatible with the structure, it has the same configuration and function as the hitting mechanism disclosed in Patent Document 1, and the detailed description because it belongs to a technique well known in the technical field to which the present invention belongs through Patent Document 1 Is omitted.

On the other hand, in the existing invention of Patent Document 1, since the fluid flows only through the respective through holes 76, 77 and 79, the pressure of the fluid is deflected only toward the respective through holes 76, 77 and 79. While there is a problem that is transmitted, in the present invention, the hydraulic pressure flowing into the valve sleeve 100 through the first stepped surface 111, the second stepped surface 112, and the third stepped surface 113 is relatively uniform. By acting so that it can be delivered to the valve spool 200 through the first through hole 121, the second through hole 122 and the third through hole 123, the outside of the valve spool 200 High pressure hydraulic pressure applied to the periphery can operate in a relatively symmetrical manner with respect to the central axis of the valve spool 200. Therefore, the friction between the outer circumferential surface of the valve spool 200 and the inner circumferential surface of the valve sleeve 100 enables smooth sliding motion and reduces the wear and scratch caused by the friction.

In addition, when considering that the first through-hole 121 formed in the valve sleeve 100 must flow through a large amount of fluid, the second through-hole 122 as shown in FIGS. 6 and 9. It is desirable to form larger than. In addition, the first through-hole 121 may be formed to be more than the second through-hole 122.

Next, the valve spool 200 will be described. As shown in FIGS. 12 and 13, the valve spool 200 is installed to be interviewed and movable inside the valve sleeve 100. As shown in FIGS. 7 and 10, the valve spool 200 has a form in which both sides are open, and are formed at the first small diameter portion 210 and the other side of the first small diameter portion 210. It comprises a large diameter portion 220 and a second small diameter portion 230 formed on the other side of the large diameter portion 220. In addition, the valve spool 200, as shown in Figure 7 and 10, the first annular groove 240 formed on the outer circumferential surface of the first small diameter portion 210 sequentially from the one side to the other direction, respectively ) And a second annular groove 250 and a third annular groove 260 formed on the outer circumferential surface of the stepped portion where the first small diameter portion 210 and the large diameter portion 220 meet each other. On the other hand, the valve spool 200, as shown in Figures 7 and 10, the first annular groove 240 is formed with two or more through holes 270 through which the working fluid can pass.

In this case, both ends of the valve spool 200 function as a hydraulic pressure surface having a main function when the valve spool 200 is operated, respectively, as shown in FIGS. 10 and 12. When divided into the first hydraulic pressure surface 201 formed at the one end and the second hydraulic pressure surface 202 formed at the other end of the valve spool 200, the area of the first hydraulic pressure surface 201 is It is preferable to be equal to or larger than the area of the second pressure receiving surface 202. Due to this feature, the area of the second pressure receiving surface determined by the upper blocking plate 99 is excessively large compared to the area of the first pressure receiving surface of the existing invention of Patent Document 1, and thus (the second pressure receiving surface >> 1st hydraulic pressure side) Excessive pressure is required to raise the valve spool, so the operating pressure rises and the speed of the valve spool decreases, so that the through hole 71 of the valve sleeve is not completely open and sufficient flow rate does not pass. By solving the problem that the impact force and the speed is lowered due to the relationship, the operation of the valve spool 200 is smooth and the operating speed is high, as well as the effect of reducing the hydraulic pulsation by such a high operating speed Will have In this case, the area of the first pressure receiving surface 201 is the area of the second pressure receiving surface 202, and the ratio of the area (first pressure receiving surface 201 / second pressure receiving surface 202) is 1.0 to 1.5. It is desirable to have a ratio.

On the other hand, at least one of the first hydraulic pressure surface 201 or the second hydraulic pressure surface 202, as shown in Figure 7, so that a plurality of recessed grooves 203 are formed, respectively, the buffer zone during operation and It is desirable to further have a lubricating effect by the incorporation of the working fluid.

Next, the valve plug 300 will be described. The valve plug 300 is installed in contact with the other end of the valve sleeve 100, as shown in Figs. As shown in FIGS. 8 and 11, the valve plug 300 has a plug recess groove 310 formed along the outer circumferential surface at one end portion of the valve plug 300 connected to the valve sleeve 100. In addition, two or more plug through holes 320 are formed in the plug recess groove 310.

In this case, the plug recess groove 310 is preferably in communication with the return passage 58 shown in Figs. 2 to 4 so that the present invention can be used compatible with the existing invention of Patent Document 1. In this case, the detailed structure of the said return path 58 has the same structure and function as the hitting mechanism disclosed in the said patent document 1 in order that this invention can be used compatible with the valve structure disclosed in the said patent document 1 In the technical field to which the present invention pertains, the detailed description is omitted.

In addition, the plug passage hole 320 has a semi-circular shape open to the one end of the valve plug 300, as shown in Figures 8 and 11 to facilitate the processing and smooth flow of the fluid. It is preferably formed so that.

The co-pneumatic breaker valve structure of the present invention having the above configuration has a similar operating principle as that of the existing invention of Patent Document 1, and can be installed and used interchangeably with the existing invention of Patent Document 1. This fully open configuration enables smooth valve up and down operation and a high operating speed, as well as a reduction in hydraulic pulsation due to such a high valve operating speed.

In addition, the hydraulic pressure flowing into the valve sleeve is applied relatively uniformly through each step surface, so that the high pressure hydraulic pressure applied to the outer periphery of the valve spool operates relatively symmetrically with respect to the central axis of the valve spool. By reducing friction between the outer circumferential surface of the valve and the inner circumferential surface of the valve sleeve, smooth sliding motion is possible and the occurrence of abrasion or scratch caused by the friction can be reduced.

In the above, the best embodiments have been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100: valve sleeve
111: first stepped surface 112: second stepped surface
113: third step surface
121: first through hole 122: second through hole
123: third through hole
131: first internal stepped surface 132: second internal stepped surface
133: third internal stepped surface
200: valve spool
201: first hydraulic pressure surface 202: second hydraulic pressure surface
203: recessed groove
210: first small diameter portion 220: large diameter portion
230: second small diameter part
240: first annular groove 250: second annular groove
260: third annular groove 270: through hole
300: valve plug
310: plug recess groove 320: plug through hole

Claims

In the co-pneumatic breaker valve structure installed in the valve chamber to redirect the fluid flow,

Inserted and installed in the valve chamber VR, both sides are open, the first stepped surface 111, the second stepped surface 112 and the third stepped surface 113 from one side to the other side along the outer peripheral surface 113 ) Are sequentially formed, and the first stepped surface 111, the second stepped surface 112, and the third stepped surface 113 are respectively two or more first through holes 121 and second through A hole 122 and a third through hole 123 are formed, and the inner circumferential surface thereof is disposed at positions corresponding to the first stepped surface 111, the second stepped surface 112, and the third stepped surface 113, respectively. A valve sleeve 100 having a first internal step surface 131, a second internal step surface 132, and a third internal step surface 133;

Interviewed inside the valve sleeve 100 is installed to be movable, both sides have an open form,
The first small diameter portion 210,
Large diameter portion 220 formed on the other side of the first small diameter portion 210,
A second small diameter portion 230 formed at the other side of the large diameter portion 220;
A first annular groove 240 and a second annular groove 250 formed on the outer circumferential surface of the first small diameter portion 210 in order from the one side to the other side, respectively;
A third annular groove 260 formed on an outer circumferential surface of the stepped portion where the first small diameter portion 210 and the large diameter portion 220 meet each other,
A valve spool 200 including at least two through holes 270 formed in the first annular groove 240;

It is installed in contact with the other end of the valve sleeve 100, the one end portion connected to the valve sleeve 100 is formed with a plug recess groove 310 along its outer peripheral surface, the plug recess groove 310 ) Valve plug 300 having two or more plug through holes 320 are formed; Characterized in that comprises a,

The first stepped surface 111a communicates with the third chamber 44 through the passage P1,
The second stepped surface 111b communicates with the return passage P2 and the fluid outlet 22.
The third stepped surface 111c is in communication with the second chamber 46,
The plug recess groove 310 is a co-pressure breaker valve structure, characterized in that in communication with the return passage (58).

The method according to claim 1,
The first hydraulic pressure surface 201 formed at the one end of the valve spool 200 and the second hydraulic pressure surface 202 formed at the other end of the valve sleeve 100 are formed of the first hydraulic pressure surface 201. Co-acting breaker valve structure, characterized in that the area is equal to or larger than the area of the second hydraulic pressure surface (202).

The method according to claim 2,
The area of the first pressure receiving surface 201 is the ratio of the area (the first pressure receiving surface 201 / the second pressure receiving surface 202) is 1.0 to 1.5. Covalent pressure breaker valve structure having a.

The method according to any one of claims 1 to 3,
At least one of the first hydraulic pressure surface (201) or the second hydraulic pressure surface (202), a plurality of mating groove portion 203 is formed, respectively.

The method according to claim 4,
The plug through hole 320,
Covalent pressure breaker valve structure characterized in that it is formed to have a semi-circular shape opened with respect to the one end of the valve plug (300).