Pilot valve
By designing a power-driven main valve stem and pilot valve stem in the pilot valve and setting the elastic element outside the valve body, the problem of insufficient vibration and stability of the valve disc under high-temperature medium in the prior art is solved, and higher reliability and adaptability are achieved.
Patent Information
- Application Number
- CN202421314967.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-06-11
AI Technical Summary
When existing pilot valves are used in high-temperature media, the performance of elastic components is degraded, resulting in valve disc vibration, insufficient stability, and the secondary valve disc jam is difficult to detect and deal with.
A pilot valve is designed, the main valve stem and the pilot valve stem are directly driven by a power drive mechanism, and the elastic element is arranged outside the valve body, and uniform force is achieved through multiple elastic elements between the first flange and the second flange. The main valve disc and the secondary valve disc are designed to adapt to the turbulent medium structure.
It improves the reliability and adaptability of the valve, reduces vibration phenomena, enhances maintainability and operating life, and is easy to deal with abnormal situations.
Smart Images
Figure CN222559188U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of valve technology, and more specifically, relates to a pilot valve. Background Art
[0002] At present, valves with pilot structures are designed and manufactured in accordance with standards such as "Pilot Pressure Reducing Valve" (GB / T12246-2006) and "Pilot Safety Valve" (GB / T 28778-2023); each manufacturer designs and manufactures according to the "Practical Valve Design Manual" and internal enterprise standards.
[0003] The shortcomings of existing valves are: the main valve disc and the valve stem are movably connected, the auxiliary valve disc and the main valve disc are pre-tightened by an elastic element, and the elastic element works in a high-temperature medium, which easily leads to the following problems: the main valve disc is not stable enough under fluid impact; the performance of the elastic element degrades or even fails at high temperatures, the valve disc is prone to vibrate, driving the entire valve body and pipeline to vibrate, and in severe cases causing the high-pressure pipeline to burst; when the auxiliary valve disc is stuck, it is difficult to detect and handle it online.
[0004] To solve this problem, the usual approach is to increase the rigidity of valve components, use labyrinth valve cages, reduce fitting clearances, and perform regular repairs or replacements. This approach not only greatly increases costs, but also fails to effectively solve the actual problem. Utility Model Content
[0005] The purpose of the embodiments of the present application is to provide a pilot valve to solve the technical problem in the prior art that the valve disc is prone to vibration due to the elastic element in the high-temperature medium and the stability and reliability are not high.
[0006] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a pilot valve, including: a valve body, a main valve disc, a main valve stem and a valve cage, the valve cage is arranged in the valve body, the main valve disc is slidably arranged in the valve cage, one end of the main valve stem is fixed on the main valve disc, and the other end extends out of the valve body, a mounting sleeve is provided on the outer side of the valve body, the main valve stem sliding seal is arranged in the mounting sleeve, the other end of the main valve stem extends out of the mounting sleeve and is provided with a first flange, a mounting channel is provided in the main valve stem, a pilot valve stem is slidingly sealed in the mounting channel, one end of the pilot valve stem is in the mounting channel and is provided with a secondary valve disc, the other end of the pilot valve stem extends out of the mounting channel and is provided with a second flange, and an elastic element is provided between the second flange and the first flange.
[0007] In one embodiment, a plurality of elastic elements are arranged circumferentially spaced apart between the first flange and the second flange.
[0008] In one embodiment, the elastic element is disposed between the first flange and the second flange via a first bolt.
[0009] In one embodiment, the main valve stem and the mounting sleeve are connected in a sliding seal via a first sealing assembly; the pilot valve stem and the main valve stem are connected in a sliding seal via a second sealing assembly.
[0010] In one embodiment, the first sealing assembly includes a first packing seal and a first compression ring, the first compression ring is provided with a third flange, the mounting sleeve is provided with a fourth flange, and a second bolt is provided between the third flange and the fourth flange.
[0011] In one embodiment, the second sealing assembly includes a second packing seal and a second compression ring, and the second compression ring is threadedly connected to the main valve stem.
[0012] In one embodiment, a boss surface is provided on the pilot valve stem, a limiting convex ring is radially protruded in the installation channel, and the boss surface is located below the lower surface of the limiting convex ring.
[0013] In one embodiment, a balancing hole is provided on the main valve stem.
[0014] In one embodiment, a fifth flange is disposed at the lower end of the mounting sleeve, a sixth flange is disposed on the outer side of the valve body, and the fifth flange is connected to the sixth flange.
[0015] The beneficial effects of the pilot valve provided by the present application are as follows: compared with the prior art, the pilot valve of the present application has good controllability because both the main valve stem and the pilot valve stem are directly driven by the power drive mechanism, the main valve flap and the auxiliary valve flap are more conveniently designed to adapt to the turbulent structure of the medium, the elastic element is arranged outside the valve body, the performance can be guaranteed for a long time, and abnormalities are easy to handle, so the reliability and adaptability of the valve are improved.
[0016] The pilot valve has a simple structure, which not only effectively solves the vibration phenomenon that is easy to occur in the pilot valve, but also improves the reliability of the valve operation, improves the maintainability, and prolongs the service life of the valve, without any change in other functions or operating methods of the valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1A schematic cross-sectional structure diagram of a pilot valve provided in an embodiment of the present application.
[0019] Among them, the reference numerals in the figure are:
[0020] 1. Pilot valve stem; 2. Elastic element; 3. Main valve stem; 4. Auxiliary valve disc; 5. Main valve disc; 6. Balancing hole; 7. First sealing assembly; 8. Second sealing assembly; 9. Valve cage; 10. Valve body; 11. Sealing ring; 12. Boss surface; 13. Mounting sleeve; 14. First flange; 15. Second flange; 16. Limiting convex ring; 17. Third flange; 18. Fourth flange; 19. Fifth flange; 20. Sixth flange. DETAILED DESCRIPTION
[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0023] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0025] like Figure 1As shown, a pilot valve provided in an embodiment of the present application is now described. The pilot valve comprises: a valve body 10, a main valve disc 5, a main valve stem 3 and a valve cage 9. The valve cage 9 is arranged in the valve body 10, and the main valve disc 5 is slidably arranged in the valve cage 9. The main valve disc 5 slides up and down to close and open the valve cage 9, thereby realizing the opening and closing of the pilot valve. One end of the main valve stem 3 is fixed on the main valve disc 5, and the other end extends out of the valve body 10. The outer side of the valve body 10 is provided with a mounting sleeve 13. The main valve stem 3 is provided with a sliding seal in the mounting sleeve 13. The other end of the main valve stem 3 extends out of the mounting sleeve 13 and is provided with a first flange 14. A mounting channel is provided in the main valve stem 3. The mounting channel is a through hole and communicates with the valve body 10. A pilot valve stem 1 is provided in the mounting channel. One end of the pilot valve stem 1 is in the mounting channel and is provided with a secondary valve disc 4. The other end of the pilot valve stem 1 extends out of the mounting channel and is provided with a second flange 15. The pilot valve stem 1 is connected to the power drive mechanism. An elastic element 2 is provided between the second flange 15 and the first flange 14. A balancing hole 6 is provided on the side wall of the main valve stem 3 located in the mounting sleeve 13, and the balancing hole 6 is connected to the mounting channel. A sealing ring 11 is provided on the main valve disc 5, and the sealing ring 11 realizes the sliding sealing connection between the main valve disc 5 and the cage 9.
[0026] Valve closing process: The force of the power drive mechanism acts downward on the pilot valve stem 1, and first drives the main valve stem 3 to move downward through the elastic element 2. When the end of the main valve disc 5 abuts against the valve cage 9, the main valve stem 3 stops moving; the pilot valve stem 1 starts to move downward until the auxiliary valve disc 4 abuts against the main valve disc 5. The pressure of the medium also acts on the auxiliary valve disc 4 and the main valve disc 5, which helps to improve the sealing performance.
[0027] Valve opening process: The force of the power drive mechanism acts upward on the pilot valve stem 1. Due to the action of the elastic element 2, the pilot valve stem 1 and the auxiliary valve disc 4 move upward first, and the main valve stem 3 remains stationary temporarily; after the balance hole 6 balances the pressure, the main valve stem 3 and the main valve disc 5 move upward with the pilot valve stem 1, and the valve opens.
[0028] In this embodiment, a plurality of elastic elements 2 are arranged at intervals between the first flange 14 and the second flange 15, and the plurality of elastic elements 2 are arranged at equal arc distances so that the force is applied evenly; the elastic element 2 is a spring. The elastic element 2 is arranged between the first flange 14 and the second flange 15 through a first bolt. The spring is sleeved on the screw of the bolt, and the two ends are respectively abutted on the first flange 14 and the second flange 15; the elastic force can be adjusted by adjusting the nut of the bolt, and the assembly and disassembly is convenient.
[0029] In this embodiment, the installation channels in the installation sleeve 13 and the main valve stem 3 are both countersunk holes, and the main valve stem 3 and the installation sleeve 13 are connected in a sliding seal through the first sealing assembly 7; the pilot valve stem 1 and the main valve stem 3 are connected in a sliding seal through the second sealing assembly 8. Specifically, the first sealing assembly 7 includes a first packing seal and a first pressure ring, a third flange 17 is provided on the first pressure ring, a fourth flange 18 is provided on the upper end of the installation sleeve 13, and a second bolt is provided between the third flange 17 and the fourth flange 18. The first pressure ring can be pressed by the second bolt to tighten the first packing seal, and the sliding seal between the main valve stem 3 and the installation sleeve 13 is realized by the first packing seal. The second sealing assembly 8 includes a second packing seal and a second pressure ring, and the second pressure ring is threadedly connected to the main valve stem 3.
[0030] In this embodiment, the pilot valve stem 1 includes a large diameter section and a small diameter section, and a boss surface 12 is formed at the connection between the large diameter section and the small diameter section. A limiting convex ring 16 is radially protruded in the installation channel. The aperture of the limiting convex ring 16 is sufficient for the small diameter section to pass through, but not for the large diameter section to pass through, so that the boss surface 12 is located below the lower surface of the limiting convex ring 16. The purpose of this design is to prevent the pilot valve stem 1 from completely separating from the main valve stem 3 and to drive the main valve stem 3 to move upward.
[0031] In this embodiment, the longitudinal section of the mounting sleeve 13 is I-shaped, a fifth flange 19 is provided at the lower end of the mounting sleeve 13, a sixth flange 20 is provided on the outer side of the valve body 10, and the fifth flange 19 and the sixth flange 20 are connected by a third bolt.
[0032] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A pilot valve, comprising: A valve body (10), a main valve disc (5), a main valve stem (3) and a valve cage (9), wherein the valve cage (9) is arranged in the valve body (10), the main valve disc (5) is slidably arranged in the valve cage (9), one end of the main valve stem (3) is fixed to the main valve disc (5), and the other end extends out of the valve body (10), characterized in that: a mounting sleeve (13) is provided on the outer side of the valve body (10), the main valve stem (3) is slidingly sealed in the mounting sleeve (13), and the main The other end of the valve stem (3) extends out of the mounting sleeve (13) and is provided with a first flange (14); a mounting channel is provided in the main valve stem (3); a pilot valve stem (1) is provided in the mounting channel as a sliding seal; one end of the pilot valve stem (1) is in the mounting channel and is provided with a secondary valve flap (4); the other end of the pilot valve stem (1) extends out of the mounting channel and is provided with a second flange (15); an elastic element (2) is provided between the second flange (15) and the first flange (14).
2. The pilot valve according to claim 1, characterized in that: A plurality of elastic elements (2) are arranged at intervals circumferentially between the first flange (14) and the second flange (15).
3. The pilot valve according to claim 2, characterized in that: The elastic element (2) is arranged between the first flange (14) and the second flange (15) via a first bolt.
4. The pilot valve according to claim 1, characterized in that: The main valve stem (3) and the mounting sleeve (13) are connected in a sliding and sealing manner via a first sealing component (7); and the pilot valve stem (1) and the main valve stem (3) are connected in a sliding and sealing manner via a second sealing component (8).
5. The pilot valve according to claim 4, characterized in that: The first sealing assembly (7) comprises a first packing seal and a first pressure ring, the first pressure ring is provided with a third flange (17), the mounting sleeve (13) is provided with a fourth flange (18), and a second bolt is provided between the third flange (17) and the fourth flange (18).
6. The pilot valve according to claim 5, characterized in that: The second sealing assembly (8) comprises a second packing seal and a second compression ring, and the second compression ring is threadedly connected to the main valve stem (3).
7. The pilot valve according to any one of claims 1 to 6, characterized in that: The pilot valve stem (1) is provided with a boss surface (12), a limiting convex ring (16) is radially protruded in the installation channel, and the boss surface (12) is located below the lower surface of the limiting convex ring (16).
8. The pilot valve according to claim 7, characterized in that: The main valve stem (3) is provided with a balancing hole (6).
9. The pilot valve according to claim 8, characterized in that: A fifth flange (19) is provided at the lower end of the mounting sleeve (13), a sixth flange (20) is provided on the outer side of the valve body (10), and the fifth flange (19) and the sixth flange (20) are connected.