CN210920241U - Pressure regulating valve - Google Patents

Abstract

The utility model provides a pressure regulating valve, include: the valve body is provided with a valve cavity for fluid to pass through; the valve core assembly is movably arranged in the valve body, the valve cavity is respectively communicated with the input end and the output end, the pressure of the input end acts on a first surface and a second surface which are arranged opposite to each other of the valve core assembly, and the pressure acting on the first surface and the pressure acting on the second surface are equal; the pressure at the output acts on the spool assembly and moves the spool assembly to balance the pressure differential between the input and the valve cavity and between the output and the valve cavity. The utility model discloses the output pressure who has improved the pressure regulating valve among the prior art receives input pressure to influence great problem.

Description

Pressure regulating valve

Technical Field

The utility model relates to the technical field of valves, particularly, relate to a pressure regulating valve.

Background

The pneumatic conveying system of the dosing machine adopts different fluid pressures for solid particle seasonings and liquid seasonings of materials, the output pressure of the existing pressure regulating valve is controllable, but the change of the input pressure has great influence on the output pressure and seriously influences the consistency of quantitative discharging precision.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a pressure regulating valve to improve the problem that the output pressure of the pressure regulating valve in the prior art is affected by the input pressure.

In order to achieve the above object, the present invention provides a pressure regulating valve, including: the valve body is provided with a valve cavity for fluid to pass through; the valve core assembly is movably arranged in the valve body, the valve cavity is respectively communicated with the input end and the output end, the pressure of the input end acts on a first surface and a second surface which are arranged opposite to each other of the valve core assembly, and the pressure acting on the first surface and the pressure acting on the second surface are equal; the pressure at the output acts on the spool assembly and moves the spool assembly to balance the pressure differential between the input and the valve cavity and between the output and the valve cavity.

Further, the valve chamber has a valve port, the first surface and the second surface are closer to the input end than the valve port in the direction of fluid flow through the valve chamber, and the contact area of the fluid acting on the first surface and the second surface is the same before entering the valve port.

Further, the valve cavity comprises an input cavity, an output cavity and a valve port located between the input cavity and the output cavity, the input cavity is communicated with the input end, the output cavity is communicated with the output end, the first surface and the second surface are located in the input cavity, and the areas of the first surface and the second surface are the same.

Further, the input chamber includes a first chamber and a second chamber, the first chamber being a first surface movable space, the second chamber being a second surface movable space.

Furthermore, the valve core assembly is provided with a large-diameter section, the inner wall of the valve body is provided with an expanding section, the large-diameter section is accommodated in the expanding section and is in sealing connection with the expanding section, the inner wall of the valve body is provided with a protrusion extending towards the large-diameter section, a valve port is formed between the protrusion and the end face of the large-diameter section, far away from the valve port, is a first surface, and the part, located on the outer side of the protrusion, of the end face, close to the valve port, of.

Further, the protrusion is annular, and the second surface is an annular surface.

Furthermore, the output cavity is divided into a first valve cavity, a second valve cavity and a third valve cavity which are communicated in sequence by the valve core assembly, the first valve cavity is set to be a space in which the valve core assembly can move upwards, the second valve cavity is communicated with the input cavity and is set to be a space in which fluid passes, the first valve cavity and the second valve cavity are communicated through a first flow passage, the first flow passage is arranged in the valve core assembly or between the valve core assembly and the valve body, the third valve cavity is set to be a space in which the valve core assembly can move downwards, and the third valve cavity and the second valve cavity are communicated through a second flow passage.

Furthermore, the pressure regulating valve also comprises an elastic component, the elastic component is connected with the valve core component and drives the valve core component to move, and when the pressure at the output end is high, the elastic component can enable the valve core component to move downwards and reduce the opening degree of the valve port; when the pressure of the output end is small, the elastic component can enable the valve core component to move upwards and increase the opening degree of the valve port.

Furthermore, the elastic component comprises an elastic separating part, the edge of the elastic separating part is connected with the valve body and divides the valve cavity into two parts, and the middle part of the elastic separating part is connected with the valve core component and is arranged at the lower part of the valve port.

Furthermore, the elastic assembly comprises an elastic separation part, a first elastic part and a second elastic part, the first elastic part, the valve core assembly and the second elastic part are respectively arranged in the valve cavity from top to bottom, and the elastic separation part is arranged between the second elastic part and the valve core assembly.

Further, the elasticity of the first elastic part to the valve core assembly is smaller than the elasticity of the second elastic part to the valve core assembly.

Use the technical scheme of the utility model, through be provided with first surface and the second surface that carries on the back mutually on the case subassembly, the fluid that flows into the valve chamber from the input can be used on first surface and the second surface simultaneously, and the pressure that acts on first surface and second surface equals, thus, the principle that the effort offsets balance each other has been utilized, two pressure size equals, opposite direction, offset each other, thereby can not drive the case subassembly when making the pressure of input change and remove, the pressure variation of having avoided the input is to the influence of case subassembly, make pressure regulating valve's aperture remain unchanged, the effect that the aperture of pressure regulating valve does not receive the pressure variation influence of input promptly has been realized. Meanwhile, the pressure of the output end can also act on the valve core assembly, and different from the input end, the pressure change of the output end can drive the valve core assembly to move, so that the opening of the pressure regulating valve correspondingly changes along with the pressure change of the output end, specifically, when the pressure of the output end is greater than a preset value, the pressure of the output end can be gradually reduced to the preset value by driving the valve core assembly to move towards the direction of reducing the opening, along with the continuous reduction of the pressure of the output end, the valve core assembly can continuously move to enable the opening of a valve port to be increased to the original position, and the pressure of the output end is recovered to the; when the pressure of output is less than the default, its drive case subassembly moves to the direction of aperture increase, can make the pressure of output can increase gradually to the default, and along with the pressure of output constantly increases, the case subassembly can constantly move and make the valve port aperture reduce to the original position, and the pressure of output just also resumes the default.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of the pressure regulating valve of the present invention at the beginning;

FIG. 2 is a schematic diagram showing the structure of the pressure regulating valve of FIG. 1 when the opening degree is changed;

FIG. 3 shows an enlarged view at P in FIG. 2; and

fig. 4 shows a schematic view of the pressure control valve of fig. 2 from another perspective.

Wherein the figures include the following reference numerals:

10. a valve body; 11. an input chamber; 12. an output cavity; 121. a first valve chamber; 122. a second valve cavity; 123. a third valve cavity; 13. a diameter expanding section; 14. a protrusion; 15. a first flow passage; 16. a second flow passage; 17. a first reducing section; 18. a second reducing section; 20. a valve core assembly; 21. a large diameter section; 22. a first small diameter section; 23. a second minor diameter section; 24. a limiting section; 30. an input end; 40. an output end; 51. an elastic partition portion; 52. a first elastic part; 53. a second elastic part; 60. and (4) an intermediate piece.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to improve the great problem of pressure regulating valve's among the prior art output pressure receives input pressure to influence, the utility model provides a pressure regulating valve.

1-4, the pressure regulating valve comprises a valve body 10 and a valve core assembly 20, wherein the valve body 10 is provided with a valve cavity for fluid to pass through; the valve core assembly 20 is movably arranged in the valve body 10, the valve cavity is respectively communicated with the input end 30 and the output end 40, the pressure of the input end 30 acts on a first surface and a second surface which are opposite to each other and are equal to each other; the pressure at the outlet 40 acts on the spool assembly 20 and moves the spool assembly 20 to balance the pressure differential between the inlet 30 and the valve chamber and between the outlet 40 and the valve chamber.

In the present embodiment, the first surface and the second surface that are opposite to each other are disposed on the valve core assembly 20, the fluid flowing into the valve cavity from the input end 30 can simultaneously act on the first surface and the second surface, and the pressures acting on the first surface and the second surface are equal to each other, thus, the principle that the acting forces counteract each other and balance is utilized, the two pressures are equal in magnitude, opposite in direction, and mutually counteract each other, so that the valve core assembly 20 is not driven to move when the pressure of the input end 30 changes, the influence of the pressure change of the input end 30 on the valve core assembly 20 is avoided, the opening degree of the pressure regulating valve is kept unchanged, and the effect that the opening degree of the pressure regulating valve is not influenced by the pressure change of the input end 30 is realized. Meanwhile, the pressure of the output end 40 also acts on the valve core assembly 20, and different from the input end 30, the pressure change of the output end 40 drives the valve core assembly 20 to move, so that the opening of the pressure regulating valve correspondingly changes along with the pressure change of the output end 40, specifically, when the pressure of the output end 40 is greater than a preset value, the pressure regulating valve drives the valve core assembly 20 to move towards the direction of opening reduction, namely, the pressure of the output end 40 can be gradually reduced to the preset value, along with the continuous reduction of the pressure of the output end 40, the valve core assembly 20 can continuously move, so that the opening of a valve port is increased to a home position, and the pressure of the output end 40; when the pressure of the output end 40 is smaller than the preset value, the valve core assembly 20 is driven by the pressure of the output end 40 to move towards the direction of increasing the opening degree, so that the pressure of the output end 40 can be gradually increased to the preset value, along with the continuous increase of the pressure of the output end 40, the valve core assembly 20 can continuously move to enable the opening degree of the valve port to be reduced to the original position, and the pressure of the output end 40 is also recovered to the preset value.

In the present embodiment, the valve chamber has a valve port, and the opening degree of the valve port is controlled by changing the distance between the valve core assembly 20 and the valve port, the first surface and the second surface are closer to the input end 30 than the valve port in the direction of fluid passing through the valve chamber, and the contact area of the fluid acting on the first surface and the contact area of the fluid acting on the second surface before entering the valve port are the same, so as to ensure that the pressure of the fluid input from the input end 30 acting on the first surface and the second surface is equal.

In this embodiment, the valve cavity includes an input cavity 11, an output cavity 12 and a valve port located between the input cavity 11 and the output cavity 12, the input cavity 11 communicates with the input end 30 through the valve port, so that the opening degree of the valve port changes the fluid flow entering the output cavity 12 from the input cavity 11, and the pressure of the output end 40 is adjusted, the output cavity 12 communicates with the output end 40, the first surface and the second surface are located in the input cavity 11, and the areas of the first surface and the second surface are the same.

Alternatively, the input chamber 11 includes a first chamber and a second chamber, which communicate with each other, the first chamber being surrounded by the first surface and the valve body 10 as a first surface movable space, and the second chamber being surrounded by the second surface and the valve body 10 as a second surface movable space.

In the embodiment, the valve core assembly 20 has a large diameter section 21, the inner wall of the valve body 10 has an expanded diameter section 13, the large diameter section 21 is accommodated in the expanded diameter section 13 and is in sealing connection with the expanded diameter section 13 through a sealing member such as a sealing ring, the inner wall of the valve body 10 has a protrusion 14 extending towards the large diameter section 21, a valve port is formed between the protrusion 14 and the end surface of the large diameter section 21, gaps are formed between the two end surfaces of the large diameter section 21 and the two end surfaces of the expanded diameter section 13, the clearance is a first cavity and a second cavity, the end surface of the large diameter section 21 far away from the valve port is a first surface, the part of the end surface of the large diameter section 21 near the valve port, which is positioned outside the bulge 14, is a second surface, this achieves the effect that the pressure on the first and second surfaces cancel each other out, while the pressure in the output chamber 12 does not affect the first and second surfaces, by locating the first and second surfaces in the input chamber 11.

Optionally, the protrusion 14 is annular, the second surface is an annular surface, and gaps are formed between the inner wall of the protrusion 14 and the valve core assembly 20 and between the outer wall of the protrusion 14 and the inner wall of the diameter-expanding section 13, so as to allow fluid to pass through.

In this embodiment, the valve core assembly 20 further has a third surface, a fourth surface and a fifth surface located in the output chamber 12, where the third surface and the fourth surface are disposed opposite to each other, and the pressure in the output chamber 12 acts on the third surface and the fourth surface at the same time, so as to cancel each other out.

The output chamber 12 of this embodiment is divided by the spool assembly 20 into a first valve chamber 121, a second valve chamber 122 and a third valve chamber 123 which are sequentially communicated from top to bottom, the first valve chamber 121 is set as a space where the spool assembly 20 can move up, the end surface of one end of the spool assembly 20 extending into the first valve chamber 121 is a third surface, the second valve chamber 122 is communicated with the input chamber 11 through the valve port and is set as a space where fluid passes, the position of the second surface is close to that of the second surface, the fourth surface is also located on the end surface of the large diameter section 21 close to the valve port, the difference is that the fourth surface is a part inside the protrusion 14, that is, the second surface and the fourth surface are separated by the protrusion 14, the second surface is located in the input chamber 11, the fourth surface is located in the second valve chamber 122, the third valve chamber 123 is set as a space where the spool assembly 20 can move down, the end surface of one end of the spool assembly 20, the pressure of the output end 40 acts on the fifth surface directly or by being driven by other components, so that the valve core component 20 is moved, and the opening of the valve port is adjusted.

In the present embodiment, the first valve chamber 121 and the second valve chamber 122 are communicated through the first flow passage 15, and the first flow passage 15 is opened in the valve core assembly 20, more specifically, the first flow passage 15 is located at the center of the valve core assembly 20 and is opened along the axial direction of the valve core assembly 20, although the first flow passage 15 may also be provided between the valve core assembly 20 and the valve body 10. Similarly, the third valve chamber 123 and the second valve chamber 122 are communicated through the second flow passage 16, and the second flow passage 16 is a through hole with a smaller diameter, so that the fluid at the outlet of the second valve chamber 122 directly enters the third valve chamber 123 and acts on the spool assembly 20, and the spool assembly 20 does not generate a sharp oscillation phenomenon when the pressure of the output end 40 changes.

As shown in fig. 1 and 4, the valve core assembly 20 of this embodiment further includes a first small diameter section 22 and a second small diameter section 23 respectively located at two ends of the large diameter section 21, wherein one end of the first small diameter section 22 extends into the first valve chamber 121, the third surface is located on the first small diameter section 22, the second small diameter section 23 extends into the third valve chamber 123 through the second valve chamber 122, and the fifth surface is located on the second small diameter section 23, and accordingly, the valve body 10 further includes a first reduced diameter section 17 and a second reduced diameter section 18 respectively located at two ends of the enlarged diameter section 13, wherein the first small diameter section 22 is located in the first reduced diameter section 17, and the side walls thereof are sealed by a sealing member such as a sealing ring, so as to ensure that the fluid can only enter the first valve chamber 121 through the first flow passage 15, and thus the fluid in the first valve chamber 121 acts on the first small diameter section 22, and the cross-sectional area of the first small diameter section 22 is the area of the third surface, the position indicated at a in fig. 3; the second reduced diameter section 23 is located in the second reduced diameter section 18, and a gap is formed between the second reduced diameter section 23 and the second reduced diameter section 18, through which the fluid in the second valve chamber 122 acts on a part of the end surface of the large diameter section 21, and the cross-sectional area of the second reduced diameter section 18 is the area of the fourth surface, i.e., the position indicated by B in fig. 3.

Meanwhile, the step surface between the large-diameter section 21 and the first reducing section 17 is matched to realize the limit when the pressure regulating valve is opened, when the valve port is opened by the large-diameter section 21, the large-diameter section 21 moves towards the direction close to the first reducing section 17, and along with the increase of the opening degree of the valve port, the distance between the large-diameter section 21 and the first reducing section 17 is gradually reduced until the two are mutually abutted, so that the limited movement range of the valve core assembly 20 is obtained.

Optionally, a groove is formed in the end surface of the large-diameter section 21 close to the second small-diameter section 23, an abutting part is accommodated in the groove, the abutting part is mainly used for being matched with the protrusion 14, and the abutting part can be set to be an elastic part or other types of parts as required, so that the fluid pressure at the valve port can be stably applied to the valve core assembly 20. And sealing elements such as sealing rings can be arranged between the abutting part and the side wall of the groove, so that a gap between the abutting part and the side wall of the groove is sealed, and fluid overflow is avoided.

In this embodiment, the pressure regulating valve further includes an elastic component, the elastic component is connected to the valve core component 20 and drives the valve core component 20 to move, when the pressure of the output end 40 is high, the elastic component enables the valve core component 20 to move down and reduce the opening of the valve port, and when the pressure of the output end 40 is low, the elastic component enables the valve core component 20 to move up and increase the opening of the valve port. The elastic component mainly plays a role in balancing the position of the valve core component 20, the original position of the opening degree of the valve port can be changed by adjusting the elastic force of the elastic component on the valve core component 20, the preset value of the pressure of the output end 40 is also changed, and when the pressure of the output end 40 is changed, the pressure of the output end 40 and the elastic component jointly act on the valve core component 20, so that the adjustment on the valve core component 20 is realized.

The elastic assembly of the present embodiment includes an elastic separating portion 51, a first elastic portion 52 and a second elastic portion 53, both the first elastic portion 52 and the second elastic portion 53 are preferably springs, the elastic separating portion 51 is preferably an elastic membrane, the first elastic portion 52, the valve core assembly 20 and the second elastic portion 53 are respectively disposed in the valve cavity from top to bottom, the first elastic portion 52 is disposed in the first valve cavity 121 and abutted against the first small diameter section 22, both the second elastic portion 53 and the elastic separating portion 51 are disposed in the third valve cavity 123, the elastic separating portion 51 is disposed between the second elastic portion 53 and the second small diameter section 23, the second elastic portion 53 is abutted against the second small diameter section 23 through the elastic separating portion 51, the middle portion of the elastic separating portion 51 is connected with the second small diameter section 23, the outer edge of the elastic separating portion 51 is connected with the inner wall of the valve body 10, thus, the elastic separating portion 51 is formed by the first elastic portion 52, the second elastic portion 53, when the pressure regulating valve is stable, the pressure of the elastic separating part 51, the elastic force of the first elastic part 52 and the elastic force of the second elastic part 53 are balanced, the position of the valve core assembly 20 is kept stable, the opening degree of the valve port is unchanged, when the power of an external load is reduced, the pressure of the output end 40 is increased, the balance of the valve core assembly 20 is broken, the elastic separating part 51, the first elastic part 52 and the second elastic part 53 are automatically regulated, the middle part of the elastic separating part 51 and the valve core assembly 20 move downwards, the distance between the end surface of the large-diameter section 21 and the bulge 14 is reduced, the opening degree of the valve port is reduced, the pressure of the output end 40 is reduced until the preset value is recovered, and at the moment, the valve core assembly 20 reaches new balance. Through the arrangement mode, on one hand, the opening degree of the valve port of the pressure regulating valve is not influenced by the pressure of the input end 30, the influence of the pressure of the input end 30 on the pressure of the output end 40 is avoided, on the other hand, the opening degree of the valve port can be timely and automatically changed when the pressure of the output end 40 changes, the opening degree of the valve port is matched with the pressure of the output end 40, and the pressure of the output end 40 is guaranteed to be stable.

Of course, it is also possible to provide only the elastic partition 51, the edge of the elastic partition 51 is connected to the valve body 10 and divides the valve chamber into two parts, the middle part of the elastic partition 51 is connected to the valve core assembly 20 and is arranged at the lower part of the valve port, and when the fluid pressure is high, the elastic partition 51 rebounds to reduce the opening degree of the valve port. In this case, the requirement for the material of the elastic partition 51 is high, so that it should be avoided that the elastic partition 51 is broken due to an excessive pressure, and the elastic partition 51 has a rebound property to move the valve element assembly 20.

In this embodiment, the valve core assembly 20 further has a limiting section 24, the limiting section 24 is located at one end of the second small diameter section 23 close to the third valve cavity 123, the limiting section 24 extends into the third valve cavity 123, the second small diameter section 23 is connected with the elastic separating portion 51 through the limiting section 24, and the movement of the elastic separating portion 51 drives the whole valve core assembly 20 to move through the limiting section 24. The limiting section 24 is stepped, and the limiting section 24 extends into a section of the third valve cavity 123, that is, the diameter of the section of the limiting section 24 close to the elastic separating portion 51 is larger than the diameter of the hole through which the limiting section 24 passes on the valve body 10, so that when the valve core assembly 20 moves towards the direction of increasing opening, the limiting section 24 can be abutted against the valve body 10, and the purpose of controlling the movement range of the valve core assembly 20 is achieved.

In the present embodiment, the elastic force of the first elastic portion 52 on the valve core assembly 20 is smaller than the elastic force of the second elastic portion 53 on the valve core assembly 20, but the relationship between the first elastic portion 52 and the second elastic portion 53 may be adjusted according to circumstances.

In the present embodiment, the pressure regulating valve further includes at least one intermediate member 60, the intermediate member 60 being disposed between the first elastic portion 52 and the spool assembly 20, the elastic force of the first elastic portion 52 acting on the spool assembly 20 through the intermediate member 60, and/or the intermediate member 60 being disposed between the second elastic portion 53 and the elastic partition portion 51, the elastic force of the second elastic portion 53 acting on the elastic partition portion 51 through the intermediate member 60. The two intermediate members 60 are provided in the present embodiment, the intermediate member 60 is a tubular structure with one end closed, the first elastic portion 52 or the second elastic portion 53 extends into the intermediate member 60 through the open end, so that the intermediate member 60 plays a certain role in guiding and stabilizing the first elastic portion 52 or the second elastic portion 53, and the closed end of the intermediate member 60 abuts against the valve core assembly 20 or the elastic partition portion 51, so that the elastic force of the first elastic portion 52 or the second elastic portion 53 can be better applied to the valve core assembly 20 or the elastic partition portion 51.

Optionally, the valve body 10 of the present embodiment is separately disposed, specifically, the valve body 10 includes a body portion, a valve port portion, an outlet portion, and a plug portion, where the body portion serves as a base of the valve body 10, other components of the pressure regulating valve are all accommodated in the body portion, the input end 30 and the output end 40 are both opened on the body portion, the body portion has a cylindrical accommodating cavity, the valve port portion and the outlet portion are both disposed in the accommodating cavity and are sleeved outside the valve core assembly 20, the valve port portion is formed with a second reducing section 18 and a protrusion 14, the outlet portion is formed with a first reducing section 17 and an expanding section 13, a side surface of the expanding section 13 is provided with a through hole, and the through hole communicates with the output end 40 and a gap between the expanding section 13 and the large. Sealing elements such as sealing rings can be arranged between the valve port part and the body part and between the outlet part and the body part so as to ensure that fluid cannot overflow from the gap. The two plug parts are respectively arranged at two ends of the body part, the main function of the plug part is to plug the openings at the two ends of the body part, the first elastic part 52 and the second elastic part 53 abut against the plug part, the plug part and the body part can be in threaded connection, when the valve body is assembled, after the components such as the valve core assembly 20 and the like are installed in the valve body 10, the plug part is screwed on the body part through threads, the plug part is adjusted, the elastic force of the first elastic part 52 and the second elastic part 53 is changed, and the pressure regulating valve is initially regulated, so that the valve port is located at the initial opening degree. A sealing member such as a gasket may be provided between the plug portion and the body portion.

Further alternatively, the body portion includes two detachable portions, namely, an upper case and a lower case, the upper case and the lower case are butted to form an accommodating cavity for accommodating the valve core assembly 20, and the upper case and the lower case can be connected by fasteners such as bolts and screws, so as to facilitate the installation of the valve core assembly 20 into the valve body 10. The elastic partition portion 51 is also installed between the upper and lower cases, the outer edge of the elastic partition portion 51 is clamped between the upper and lower cases, and the middle portion of the elastic partition portion 51 is connected to the spool assembly 20, so that the elastic partition portion 51 is deformed to act on the spool assembly 20 while being stabilized in the valve body 10.

It should be noted that, a plurality in the above embodiments means at least two.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

1. the problem that the output pressure of the pressure regulating valve in the prior art is greatly influenced by the input pressure is solved;

2. the principle that acting forces are mutually offset and balanced is utilized, the opening degree of a valve port of the pressure regulating valve is not influenced by input pressure, and the influence of the input pressure on output pressure is avoided;

3. when the output pressure changes, the opening degree of the valve port can be timely and automatically changed, so that the opening degree of the valve port is matched with the output pressure, and the stability of the output pressure is ensured;

4. the second flow passage is communicated with the second valve cavity and the third valve cavity, so that the phenomenon that the fluid at the outlet of the second valve cavity directly acts on the valve core assembly is avoided, and the valve core assembly does not generate rapid oscillation when the pressure of the output end is changed;

5. the whole structure is simple, and the use and the operation are convenient.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A pressure regulating valve, comprising:

a valve body having a valve cavity for passage of fluid therethrough;

the valve core assembly is movably arranged in the valve body, the valve cavity is respectively communicated with an input end and an output end, the pressure of the input end acts on a first surface and a second surface which are opposite to each other, and the pressure acting on the first surface and the pressure acting on the second surface are equal; the pressure of the output acts on the spool assembly and moves the spool assembly to balance the pressure differential between the input and the valve cavity and between the output and the valve cavity.

2. The pressure-regulating valve of claim 1, wherein the valve chamber has a valve port, the first and second surfaces are closer to the input end than the valve port in a direction of fluid flow through the valve chamber, and the contact area of fluid acting on the first surface is the same as the contact area of fluid acting on the second surface before entering the valve port.

3. The pressure regulator valve of claim 2, wherein the valve chamber comprises an input chamber, an output chamber, and a valve port located between the input chamber and the output chamber, the input chamber being in communication with the input end, the output chamber being in communication with the output end, the first surface and the second surface being located within the input chamber, and the first surface and the second surface being the same area.

4. The pressure-regulating valve of claim 3, wherein the input chamber comprises a first chamber and a second chamber, the first chamber being the first surface movable volume and the second chamber being the second surface movable volume.

5. The pressure regulating valve according to claim 3, wherein the valve core assembly has a large diameter section, the inner wall of the valve body has a diameter expanding section, the large diameter section is accommodated in the diameter expanding section and is in sealed connection with the diameter expanding section, the inner wall of the valve body has a protrusion extending toward the large diameter section, the protrusion and an end surface of the large diameter section form the valve port therebetween, an end surface of the large diameter section, which is far away from the valve port, is the first surface, and a portion, which is on an end surface of the large diameter section, which is close to the valve port and is located outside the protrusion, is the second surface.

6. The pressure-regulating valve of claim 5, wherein said protrusion is annular and said second surface is an annular surface.

7. The pressure regulating valve according to claim 3, wherein the output chamber is partitioned by the spool assembly into a first valve chamber, a second valve chamber and a third valve chamber which are communicated in sequence, the first valve chamber is provided as a space where the spool assembly can move up, the second valve chamber is communicated with the input chamber and provided as a space where fluid passes, the first valve chamber is communicated with the second valve chamber through a first flow passage, the first flow passage is provided in the spool assembly or between the spool assembly and the valve body, the third valve chamber is provided as a space where the spool assembly can move down, and the third valve chamber is communicated with the second valve chamber through a second flow passage.

8. The pressure regulating valve according to claim 2, further comprising an elastic assembly, wherein the elastic assembly is connected to the valve core assembly and drives the valve core assembly to move, and when the pressure at the output end is high, the elastic assembly can move the valve core assembly downwards and reduce the opening degree of the valve port; when the pressure of the output end is small, the elastic assembly can enable the valve core assembly to move upwards and increase the opening degree of the valve port.

9. The pressure-regulating valve of claim 8, wherein the resilient assembly includes a resilient partition having an edge connected to the valve body and dividing the valve chamber into two portions, and a middle portion connected to the spool assembly and disposed below the valve port.

10. The pressure regulating valve according to claim 8, wherein the elastic assembly includes an elastic separating portion, a first elastic portion and a second elastic portion, the first elastic portion, the valve core assembly and the second elastic portion are respectively disposed in the valve cavity from top to bottom, and the elastic separating portion is disposed between the second elastic portion and the valve core assembly.

11. The pressure-regulating valve according to claim 10, wherein the first elastic portion has a smaller elastic force on the spool assembly than the second elastic portion.

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