Valve sleeve assembly and pilot valve

Abstract

The valve sleeve assembly comprises a valve sleeve and a screw plug, the valve sleeve is provided with a first liquid passing hole, a second liquid passing hole and a valve cavity, a pressure adjusting opening is formed in the end, close to the valve cavity, of the first liquid passing hole, the screw plug is provided with a threaded section, a sealing section, a pressure adjusting section and a boss section, the threaded section is in threaded connection with the inner wall of the valve cavity, and the sealing section is in threaded connection with the inner wall of the valve cavity. The sealing section is in sliding sealing connection with the inner wall of the valve cavity, the pressure adjusting section is used for being in sealing fit with the pressure adjusting opening, and the boss section is used for stretching into the first liquid passing hole. The valve sleeve assembly can be used in a pilot valve, the boss section extends into the first liquid passing hole through the adjusting plug to achieve the effects of throttling and reducing the flow speed of liquid, and a certain gap is formed between the pressure adjusting section and the pressure adjusting opening or the pressure adjusting section and the pressure adjusting opening are in complete sealing contact to achieve the effects of throttling and adjusting the pressure of a pilot valve cavity. Through two-stage throttling, the flow speed of liquid is slowed down when the plug rotates, then the pressure increasing speed of a pilot valve cavity is slowed down, and more accurate pressure adjusting operation is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic equipment technical field, specifically, relate to a valve sleeve subassembly and pilot valve. BACKGROUND

[0002] The overflow valve is a kind of pressure regulating device of hydraulic system, and is widely applied in mine spray pump station and other hydraulic equipment, and the pressure of high-pressure water required by the dust removal spray of its working face is regulated by the overflow valve.The pressure regulation of overflow valve is mainly by the rotation of pressure regulating nut on pilot valve, so that a certain pressure is established in pilot valve chamber, thereby the setting pressure of overflow valve is controlled.

[0003] In prior art, pilot valve only adjusts pressure by the rotation of pressure regulating nut, and it is difficult to realize accurate pressure regulation;Pilot valve chamber is usually a complete deep hole, and corresponding pilot valve sealing surface is located inside the deep hole, which is difficult to process, and once the sealing surface is damaged, it will lead to the decrease of pressure regulating accuracy or even valve body failure, so the pilot valve needs to be replaced, and the replacement and maintenance are not convenient. UTILITY MODEL CONTENTS

[0004] The utility model mainly aims at providing a valve sleeve subassembly and pilot valve to solve at least one of the technical problems in related art, such as the difficulty of pilot valve in realizing accurate pressure regulation, the difficulty of pilot valve sealing surface in processing and the inconvenience of replacement and maintenance.

[0005] In order to achieve the above-mentioned purpose, according to the utility model, a valve sleeve subassembly is provided, which comprises a valve sleeve and a screw plug, the valve sleeve is provided with a first liquid passage, a second liquid passage and a valve chamber, the first liquid passage is provided with a pressure regulating port at one end close to the valve chamber, the screw plug is provided with a threaded section, a sealing section, a pressure regulating section and a boss section, the threaded section is threadedly connected with the inner wall of the valve chamber, the sealing section is slidingly and sealingly connected with the inner wall of the valve chamber, the pressure regulating section is used for sealing cooperation with the pressure regulating port, and the boss section is used for extending into the first liquid passage.

[0006] Further, the valve sleeve comprises a first valve sleeve and a second valve sleeve, the first valve sleeve is provided with a first valve chamber, the second valve sleeve is provided with a second valve chamber, the first liquid passage and the second liquid passage, and the first valve sleeve and the second valve sleeve are detachably connected to communicate the first valve chamber with the second valve chamber to form the valve chamber.

[0007] Further, the threaded section is threadedly connected with the first valve chamber, and the sealing section is slidingly and sealingly connected with the second valve chamber.

[0008] Further, one of the first valve sleeve and the second valve sleeve is provided with a recessed portion, and the other of the first valve sleeve and the second valve sleeve is provided with a protruding portion, the protruding portion is inserted with the recessed portion and is detachably connected through a fastener.

[0009] Further, the first liquid passing hole is an equal cross-section through hole structure, and the boss section is an equal cross-section boss structure.

[0010] Further, the cross-sectional area of the boss section is equal to 30% to 99% of the cross-sectional area of the first liquid passing hole.

[0011] Further, the cross-sectional shape of the boss section and the first liquid passing hole is the same, and the cross-sectional shape is circular, elliptical or polygonal.

[0012] Further, a locking nut is further included, the locking nut is threadedly connected on the threaded section, and the locking nut is used for abutting against the valve sleeve to limit the position of the screw plug.

[0013] Further, the first valve sleeve is provided with a threaded portion to be detachably connected with a valve body of a pilot valve.

[0014] The utility model also provides a pilot valve, including energy accumulator, valve body, first valve sleeve assembly and second valve sleeve assembly, first valve sleeve assembly and second valve sleeve assembly all adopt valve sleeve assembly, energy accumulator, first valve sleeve assembly and second valve sleeve assembly install on valve body, valve body is equipped with liquid inlet pipeline and pressure relief pipeline, liquid inlet pipeline connects energy accumulator with first valve sleeve assembly, and pressure relief pipeline connects energy accumulator with second valve sleeve assembly.

[0015] The valve sleeve assembly in the utility model can be used in a pilot valve, the screw plug is threadedly connected with the inner wall of the valve cavity through the threaded section and is slidingly and sealingly connected with the inner wall of the valve cavity through the sealing section, when the screw plug is screwed in or out, the sealing section, the pressure regulating section and the boss section move accordingly, the boss section extends into the first liquid passing hole to achieve the effect of throttling and slowing down the liquid flow rate, the pressure regulating section and the pressure regulating port form a certain gap or completely sealing contact to achieve the effect of throttling and regulating the pressure of the pilot valve chamber, the liquid flow rate is slowed down when the screw plug rotates through two-stage throttling, and then the increasing speed of the pressure of the pilot valve chamber is slowed down, so that more accurate pressure regulating operation is facilitated.

[0016] The pilot valve in the utility model, through the valve sleeve assembly, realizes the adjustment of the pilot valve chamber pressure, through the boss section into the first liquid hole, the pressure regulating section and the pressure regulating port form a certain gap, realizes the two-stage throttling and the effect of slowing down the liquid flow rate, is favorable for realizing more accurate pressure regulating operation;The first valve sleeve assembly and the second valve sleeve assembly in the pilot valve can realize the adjustment of the liquid inlet end pressure and the pressure relief end pressure respectively, and can realize more accurate pilot valve pressure regulating operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application, and do not constitute any improper limitation to the present application. In the drawings:

[0018] Figure 1 The cross-sectional view of the valve sleeve assembly provided for the embodiment of the utility model;

[0019] Figure 2 The three-dimensional schematic view of the valve sleeve assembly provided for the embodiment of the utility model;

[0020] Figure 3 The cross-sectional view of the pilot valve provided for the embodiment of the utility model.

[0021] Among them, the above drawings include the following reference signs:

[0022] 1, valve sleeve;101, first liquid hole;1011, pressure regulating port;102, second liquid hole;103, valve cavity;1031, first valve cavity;1032, second valve cavity;11, first valve sleeve;111, groove part;112, threaded part;12, second valve sleeve;121, protruding part;2, screw plug;21, threaded section;22, sealing section;23, pressure regulating section;24, boss section;3, locking nut;4, fastener;

[0023] 01, accumulator;02, valve body;021, liquid inlet pipeline;022, pressure relief pipeline;03, first valve sleeve assembly;04, second valve sleeve assembly. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0025] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0026] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of providing an appropriate understanding. Technical, methods, and apparatuses known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the description as appropriate. In all examples shown and discussed herein, any specific value is to be interpreted as merely exemplary and not as a limitation. Thus, other examples of example embodiments can have different values. It is noted that like references and designations can indicate like items in the drawings, and once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0027] The utility model provides a valve sleeve subassembly, including valve sleeve 1 and screw plug 2, valve sleeve 1 is equipped with first liquid hole 101, second liquid hole 102 and valve cavity 103, first liquid hole 101 is equipped with pressure regulating port 1011 near one end of valve cavity 103, screw plug 2 is equipped with threaded section 21, sealing section 22, pressure regulating section 23 and boss section 24, threaded section 21 is connected with the inner wall of valve cavity 103 threadedly, sealing section 22 is connected with the inner wall of valve cavity 103 sliding seal, pressure regulating section 23 is used to seal with pressure regulating port 1011, boss section 24 is used to extend into first liquid hole 101.

[0028] Exemplarily, in combination with Figure 1 and Figure 2As shown, the inside of the valve sleeve 1 is provided with a valve cavity 103, in this embodiment, the valve cavity 103 is open at one end along the positive direction of the X axis in the drawing, so that the screw plug 2 enters the valve cavity 103 from the opening, so that the threaded segment 21 is threadedly connected with the inner wall of the valve cavity 103; the sealing segment 22 can be connected with the inner wall of the valve cavity 103 in a sliding sealing manner through a gap sealing fit, a sealing ring sealing fit, etc.; the valve sleeve 1 is provided with a first liquid passage hole 101 and a second liquid passage hole 102, preferably, a plurality of second liquid passage holes 102 are uniformly and spaced apart around the axial direction of the valve sleeve 1, the first liquid passage hole 101 is coaxial with the valve cavity 103, so that when the screw plug 2 is screwed in, the pressure regulating segment 23 is sealingly fitted with the pressure regulating port 1011, and at the same time, the boss segment 24 extends into the first liquid passage hole 101; preferably, the pressure regulating segment 23 is a conical structure, the pressure regulating port 1011 is a conical groove structure, and the pressure regulating segment 23 and the pressure regulating port 1011 can be sealingly fitted with each other in a conical surface (the specific structure of the pressure regulating segment 23 and the pressure regulating port 1011 can be designed with reference to the sealing structure in the prior art, for example, it can also be a spherical surface sealing, etc., which is not limited here); preferably, the first liquid passage hole 101 is a circular cross-section through hole, the boss segment 24 is a circular cross-section boss, and the size of the boss segment 24 is slightly smaller than the size of the first liquid passage hole 101, so as to ensure that after the boss segment 24 extends into the first liquid passage hole 101, the liquid can flow relatively uniformly around the boss segment 24.

[0029] In one embodiment, the first liquid passage 101 can be a tapered through hole, and the boss section 24 can be a tapered boss. As the gland 2 is screwed in, the boss section 24 first extends into the first liquid passage 101, and a certain gap is formed between the outer tapered surface of the boss section 24 and the inner tapered surface of the first liquid passage 101 (the taper of the boss section 24 and the first liquid passage 101 can be equal or not equal), at this time, there is still a certain gap between the pressure regulating section 23 and the pressure regulating port 1011, so that the liquid flow rate is slowed down through two-stage throttling (one stage is the boss section 24 and the first liquid passage 101, and the other stage is the pressure regulating section 23 and the pressure regulating port 1011); as the gland 2 continues to be screwed in, when the pressure regulating section 23 and the pressure regulating port 1011 are in sealing fit, there is still a certain gap between the first liquid passage 101 and the boss section 24, so that the first liquid passage 101 and the boss section 24 can still achieve throttling effect when the gland 2 is screwed out next time. In another embodiment, the boss section 24 is a multi-section boss subsection with gradually decreasing cross-sectional area, and the first liquid passage 101 is a multi-section through hole subsection with gradually decreasing cross-sectional area. For example, the boss section 24 includes two cylindrical boss subsections (for these two cylindrical boss subsections, each cylindrical boss subsection is of equal cross-section structure, but the cross-sectional areas of the two cylindrical boss subsections are not equal), and the two cylindrical boss subsections are connected by a tapered boss subsection (the cross-sectional area of one end of the tapered boss subsection is equal to the cross-sectional area of one cylindrical boss subsection, and the cross-sectional area of the other end is equal to the cross-sectional area of the other cylindrical boss subsection), and correspondingly, the first liquid passage 101 includes two cylindrical through hole subsections, and the two cylindrical through hole subsections are connected by a tapered through hole subsection. Thus, in this embodiment, the pressure regulating section 23 and the pressure regulating port 1011 can form one-stage throttling, and the boss section 24 and the first liquid passage 101 achieve three-stage throttling through three boss subsections and three through hole subsections, and the entire valve sleeve assembly achieves four-stage throttling (it can also be understood as two-stage throttling in total, one stage of throttling is formed by the pressure regulating section 23 and the pressure regulating port 1011, which can be completely sealed or throttled; the other stage of throttling is formed by the boss section 24 and the first liquid passage 101, which can be single-section or multi-section, and can be equal cross-section or variable cross-section, but for this stage of throttling, there should be a certain gap regardless of the position of the gland 2 to ensure the throttling effect).

[0030] When the screw plug 2 is rotated out, the pressure regulating section 23 is not in sealed contact with the pressure regulating port 1011, and the boss section 24 does not extend into the first liquid passage hole 101, the flow area between the first liquid passage hole 101 and the second liquid passage hole 102 is large, the pilot valve chamber pressure is small, and the liquid flow rate is fast; as the screw plug 2 is rotated in until the boss section 24 extends into the first liquid passage hole 101 (at this time, the pressure regulating section 23 gradually approaches the pressure regulating port 1011 but is still not in sealed contact), the extension of the boss section 24 makes the flow area in the first liquid passage hole 101 smaller, the liquid flow rate slows down, and the speed at which the pilot valve chamber pressure increases slows down, achieving a throttling effect; as the screw plug 2 continues to be rotated in, the pressure regulating section 23 gradually approaches the pressure regulating port 1011 until they are in complete sealed contact, precise adjustment of the pilot valve chamber pressure is achieved through this process, and after the pressure is adjusted, the screw plug 2 can be fixed by an external locking device or other means to ensure stable pressure.

[0031] The valve sleeve assembly in the utility model can be used in a pilot valve, the screw plug 2 is connected with the inner wall of the valve cavity 103 through the threaded section 21, and is connected with the inner wall of the valve cavity 103 through the sealing section 22; when the screw plug 2 is rotated in or out, the sealing section 22, the pressure regulating section 23 and the boss section 24 move, the boss section 24 extends into the first liquid passage hole 101 to achieve the effects of throttling and slowing down the liquid flow rate, and the pressure regulating section 23 and the pressure regulating port 1011 form a certain gap or complete sealed contact to achieve the effects of throttling and adjusting the pilot valve chamber pressure; two-stage throttling makes the liquid flow rate slow down when the screw plug 2 is rotated, and then the speed at which the pilot valve chamber pressure increases slows down, facilitating more accurate pressure adjustment operation.

[0032] Further, the valve sleeve 1 comprises a first valve sleeve 11 and a second valve sleeve 12, the first valve sleeve 11 is provided with a first valve cavity 1031, the second valve sleeve 12 is provided with a second valve cavity 1032, the first liquid passage hole 101 and the second liquid passage hole 102, and the first valve sleeve 11 and the second valve sleeve 12 are detachably connected to communicate the first valve cavity 1031 and the second valve cavity 1032 to form the valve cavity 103.

[0033] In combination with FIGS. 1-3, Figure 1 and Figure 2 As shown in the drawings, the valve sleeve 1 is formed by detachable connection of the first valve sleeve 11 and the second valve sleeve 12, the first valve cavity 1031 is formed in the first valve sleeve 11, the second valve cavity 1032 is formed in the second valve sleeve 12, and the first valve cavity 1031 and the second valve cavity 1032 are communicated to form the valve cavity 103 after insertion (in the prior art, the first valve sleeve 11 and the second valve sleeve 12 are mostly integrated, which makes it difficult to machine the deep hole of the valve cavity 103). In an optional embodiment, the first valve sleeve 11 and the second valve sleeve 12 are detachably connected by threaded cooperation (not shown in the drawings).

[0034] In this way, the valve cavity 103 can be divided into a first valve cavity 1031 and a second valve cavity 1032, facilitating the machining of the pilot valve chamber sealing surface and avoiding the difficulty of deep hole machining; in addition, when the sealing surface is damaged, only the second valve sleeve 12 needs to be disassembled and replaced, facilitating the disassembly and maintenance of the pilot valve.

[0035] Further, the threaded segment 21 is threadedly connected with the first valve cavity 1031, and the sealing segment 22 is slidingly and sealingly connected with the second valve cavity 1032.

[0036] In combination Figure 1 As shown, the inner wall of the first valve cavity 1031 is provided with internal threads, thereby being threadedly connected with the threaded segment 21, so that the screw plug 2 can be screwed in or out, and the upper portion of the sealing segment 22 is provided with an annular groove for setting a sealing ring, which is slidingly and sealingly connected with the inner wall of the second valve cavity 1032.

[0037] In this way, the sealing surface (at least including the sealing contact surface of the sealing segment 22 slidingly connected with the second valve cavity 1032 and the sealing contact surface of the pressure regulating segment 23 connected with the pressure regulating port 1011) is located in the second valve cavity 1032, and the first valve cavity 1031 is mainly used for setting threads, so that when the sealing surface is damaged, the second valve sleeve 12 can be directly disassembled and replaced, thereby improving the convenience of disassembly and maintenance of the pilot valve.

[0038] Further, one of the first valve sleeve 11 and the second valve sleeve 12 is provided with a groove portion 111, and the other is provided with a protruding portion 121, and the protruding portion 121 is inserted into the groove portion 111 and is detachably connected through the fastener 4.

[0039] In combination Figure 1 As shown, the first valve sleeve 11 and the second valve sleeve 12 are inserted into each other through a groove portion 111 and a protruding portion 121. In this embodiment, the groove portion 111 is arranged at the reverse end of the first valve sleeve 11 along the X axis, and the protruding portion 121 is arranged at the forward end of the second valve sleeve 12 along the X axis, the first valve cavity 1031 is a cavity that penetrates the first valve sleeve 11 through the center of the groove portion 111, and the second valve cavity 1032 is a cavity that extends from the center of the protruding portion 121 to the reverse direction of the X axis. The protruding portion 121 and the groove portion 111 are provided with mounting holes corresponding to each other, so that the protruding portion 121 and the groove portion 111 are detachably connected through the fastener 4. In this embodiment, the fastener 4 is an internal hexagonal recessed end fastening screw, so as to avoid the end of the fastener 4 protruding from the valve sleeve assembly, thereby preventing installation.

[0040] Thus, by inserting and connecting the groove part 111 and the protrusion part 121 and by the fastener 4, the first valve sleeve 11 and the second valve sleeve 12 are conveniently installed by inserting and aligning and then fixedly installed by the fastener 4, which is more convenient. When disassembling, the fastener 4 is disassembled, and then the protrusion part 121 and the groove part 111 are separated, which is more convenient.

[0041] Further, the first liquid passing hole 101 is an equal cross-section through hole structure, and the boss section 24 is an equal cross-section boss structure.

[0042] Illustratively, the first liquid passing hole 101 is a quadrilateral cross-section through hole structure (the cross sections are all quadrilaterals with equal sizes), the boss section 24 is a circular cross-section boss structure (the cross sections are all circles with equal sizes), and the gap formed by the boss section 24 extending into the first liquid passing hole 101 is also an equal cross-section.

[0043] In this way, compared with the variable cross-section through hole structure and the variable cross-section boss structure, the equal cross-section through hole structure and the equal cross-section boss structure are relatively simple and convenient to process.

[0044] Preferably, the cross-sectional area of the boss section 24 is equal to 30% to 99% of the cross-sectional area of the first liquid passing hole 101.

[0045] In this embodiment, the boss section 24 is an equal cross-section boss structure, the first liquid passing hole 101 is an equal cross-section through hole structure, the cross-sectional area of the boss section 24 is equal to 30% to 99% of the cross-sectional area of the first liquid passing hole 101, and the specific cross-sectional area ratio can be designed according to actual needs. In this way, the throttling effect can be guaranteed, and the boss section 24 and the first liquid passing hole 101 can be prevented from being sealed together.

[0046] Preferably, the cross-sectional shape of the boss section 24 is the same as that of the first liquid passing hole 101, and the cross-sectional shape is circular, elliptical, or polygonal.

[0047] The boss section 24 and the first liquid passing hole 101 are both equal cross-section structures, and the cross-sectional shape of the boss section 24 is the same as that of the first liquid passing hole 101 (the cross sections of the two are similar figures), which can be circular, elliptical, or polygonal (such as triangular, quadrilateral, etc.).

[0048] In this way, the gap between the boss section 24 and the first liquid passing hole 101 is relatively uniform, the liquid flow rate is relatively uniform, the throttling effect is good, and these cross-sectional shapes are relatively simple and easy to process and manufacture.

[0049] Further, a locking nut 3 is provided, which is threadedly connected to the threaded section 21 and used to abut against the valve sleeve 1 to limit the position of the screw plug 2.

[0050] As shown in Figure 1 The inner ring of the lock nut 3 is provided with an internal thread to connect with the external thread of the threaded section 21, and the lock nut 3 is located on the side of the first valve sleeve 11 close to the positive direction of the X axis, so that after the screw plug 2 is installed into the first valve cavity 1031 along the negative direction of the X axis, the lock nut 3 can be rotated to abut against the first valve sleeve 11 after the pressure is adjusted, thereby limiting the rotation of the screw plug 2.

[0051] In this way, the screw plug 2 can be limited by abutting against the valve sleeve 1 through the lock nut 3, and the screw plug 2 can be locked and limited by the lock nut 3 after the pressure is adjusted, so as to avoid the shaking of the screw plug 2 and ensure the stability of the liquid pressure.

[0052] Further, the first valve sleeve 11 is provided with a threaded portion 112 to be detachably connected with the valve body 02 of the pilot valve.

[0053] As shown in Figure 1 , Figure 2 and Figure 3 The outer surface of the first valve sleeve 11 is provided with a threaded portion 112, and the valve body 02 of the pilot valve is provided with a mounting groove matched with the valve sleeve assembly, and an internal thread is correspondingly formed in the mounting groove to enable the first valve sleeve 11 to be threadedly connected therein, thereby realizing the function of detachable connection.

[0054] In this way, when the pilot valve has a problem such as damage of the sealing surface, the valve sleeve assembly can be rotated and detached, and the first valve sleeve 11 and the second valve sleeve 12 can be separated, so that the second valve sleeve 12 can be replaced, and the whole maintenance and replacement process is relatively convenient.

[0055] The utility model also provides a pilot valve, including energy accumulator 01, valve body 02, first valve sleeve assembly 03 and second valve sleeve assembly 04, first valve sleeve assembly 03 and second valve sleeve assembly 04 all adopt the valve sleeve assembly, energy accumulator 01, first valve sleeve assembly 03 and second valve sleeve assembly 04 are installed in valve body 02, valve body 02 is equipped with liquid inlet pipeline 021 and pressure relief pipeline 022, liquid inlet pipeline 021 connects first valve sleeve assembly 03 with energy accumulator 01, and pressure relief pipeline 022 connects second valve sleeve assembly 04 with energy accumulator 01.

[0056] As shown in Figure 1 , Figure 2 and Figure 3As shown, the P port and the R port of the pilot valve are identified in the figure, and the P port and the R port are respectively provided with the first valve sleeve assembly 03 and the second valve sleeve assembly 04. Exemplarily, in the use process, first, the first valve sleeve assembly 03 corresponding to the liquid inlet end P port is adjusted, the pressure is adjusted to the target pressure by rotating the screw plug 2 of the first valve sleeve assembly 03; if the pressure is higher than the target pressure, then the second valve sleeve assembly 04 corresponding to the pressure relief end R port can be adjusted, and the pressure is adjusted to the target pressure by rotating the screw plug 2 of the second valve sleeve assembly 04.

[0057] The pilot valve in the utility model, through adopting the valve sleeve assembly, realizes the adjustment of the pilot valve chamber pressure, through the boss section 24 extending into the first liquid passing hole 101, the pressure regulating section 23 and the pressure regulating port 1011 form a certain gap, realize two stage throttling and slow down the effect of liquid flow rate, be favorable to realize more accurate pressure regulating operation;The first valve sleeve assembly 03 and the second valve sleeve assembly 04 in the pilot valve can realize the adjustment of the liquid inlet end pressure and the pressure relief end pressure respectively, and more accurate pilot valve pressure regulating operation can be realized.

[0058] In the description of the utility model, it is understood that the orientation words such as "front, back, top, bottom, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is usually based on the orientation or position relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, in the case where no opposite statement is made, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it can not be understood as the limitation to the protection scope of the utility model;The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0059] For the convenience of description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the figure. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the figure. For example, if the device in the figure is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0060] In addition, it needs to be explained that the use of "first", "second" and the like to limit the parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning if there is no further declaration, and therefore cannot be understood as limiting the protection scope of the utility model.

[0061] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A valve sleeve assembly, characterized by, The valve sleeve is provided with a first liquid passing hole, a second liquid passing hole and a valve cavity, the first liquid passing hole is provided with a pressure regulating hole near one end of the valve cavity, the screw block is provided with a threaded section, a sealing section, a pressure regulating section and a boss section, the threaded section is threadedly connected with the inner wall of the valve cavity, the sealing section is slidingly and sealingly connected with the inner wall of the valve cavity, the pressure regulating section is used for sealingly cooperating with the pressure regulating hole, and the boss section is used for extending into the first liquid passing hole.

2. The valve sleeve assembly of claim 1, wherein, The valve sleeve comprises a first valve sleeve and a second valve sleeve, the first valve sleeve is provided with a first valve cavity, and the second valve sleeve is provided with a second valve cavity, the first liquid passing hole and the second liquid passing hole, the first valve sleeve is detachably connected with the second valve sleeve, so that the first valve cavity and the second valve cavity are communicated to form the valve cavity.

3. The valve sleeve assembly of claim 2, wherein, The threaded section is threadedly connected with the first valve cavity, and the sealing section is slidingly and sealingly connected with the second valve cavity.

4. The valve sleeve assembly of claim 2, wherein, One of the first valve sleeve and the second valve sleeve is provided with a recessed section, and the other of the first valve sleeve and the second valve sleeve is provided with a protruding section, the protruding section is inserted into the recessed section and detachably connected through a fastener.

5. The valve cage assembly of claim 1, wherein, The first liquid passing hole is an equal-section through hole structure, and the boss section is an equal-section boss structure.

6. The valve sleeve assembly of claim 5, wherein, The cross-sectional area of the boss section is equal to 30% to 99% of the cross-sectional area of the first liquid passing hole.

7. The valve sleeve assembly of claim 5, wherein, The cross-sectional shape of the boss section is the same as that of the first liquid passing hole, and the cross-sectional shape is circular, elliptical or polygonal.

8. The valve cage assembly of claim 1, wherein, A locking nut is further included, the locking nut is threadedly connected with the threaded section, and the locking nut is used for abutting against the valve sleeve to limit the screw block.

9. The valve cage assembly of claim 2, wherein, The first valve sleeve is provided with a threaded section to detachably connect with a valve body of a pilot valve.

10. A pilot valve characterized by The energy accumulator, the first valve sleeve assembly and the second valve sleeve assembly are mounted on the valve body, the valve body is provided with a liquid inlet pipeline and a pressure relief pipeline, the liquid inlet pipeline connects the first valve sleeve assembly and the energy accumulator, and the pressure relief pipeline connects the second valve sleeve assembly and the energy accumulator.

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