High-temperature and high-pressure control valve

Abstract

The utility model relates to the technical field of control valves, in particular to a high-temperature and high-pressure control valve, which comprises a valve body, a valve seat, a valve core and a valve core, a bonnet is arranged at the top of the valve body; a valve rod is movably mounted on the valve cover; the sleeve assembly is arranged in the inner cavity of the valve body, and the bottom of the sleeve assembly is connected with the valve seat; the valve element assembly comprises a large valve element connected with an inner cavity of the sleeve assembly in a sliding mode and a small valve element arranged in a containing cavity in the top of the large valve element, and the small valve element is fixedly connected with the valve rod. The labyrinth disc assembly is brazed at the lower part of the large valve core; and an inner ring of the guide sealing ring is connected with the upper end of the side wall of the large valve element in an interference fit mode, and an outer ring of the guide sealing ring is connected with an inner cavity of the sleeve assembly in a sealed mode. As a guide sealing part between the valve core component and the upper guide sleeve, the guide sealing ring made of the metal material is very hard and wear-resistant, can keep stable guide under high-temperature and high-pressure working conditions, can play a role in auxiliary sealing, and makes up leakage between the small valve core and the valve seat.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a high-temperature and high-pressure control valve. Background Art

[0002] The existing pilot control valve mainly includes two valve cores. The large valve core and the valve seat form the valve seal, and the small valve core and the sealing surface on the large valve core form the valve internal seal. A spring is also provided inside to provide internal power and internal stability. When the valve needs to be opened, the actuator drives the small valve core to move upward, the sealing surface at the small valve core opens, the pressure difference before and after the valve is eliminated, and the opening of the small valve core drives the opening of the valve seal. When the valve needs to be closed, the actuator pushes the small valve core downward, and then pushes the disc spring. When the small valve core and the sealing surface of the large valve core come into contact, the large valve core moves downward to the sealing surface of the valve seat to form the valve seal;

[0003] However, the large valve core in the existing guide control valve is in direct contact with the sleeve and is extremely prone to wear and leakage under high temperature and high pressure environments, resulting in high maintenance costs; the valve also has no pressure reduction or noise reduction effect and is also very prone to flash evaporation and cavitation. Utility Model Content

[0004] The purpose of this utility model is to solve the shortcomings of the prior art and provide a high-temperature and high-pressure control valve, comprising:

[0005] A valve body, wherein a valve seat is provided at the bottom of the inner cavity of the valve body, and the valve seat is fixedly connected to the valve body; a valve cover is provided at the top of the valve body, and the valve cover is connected to the valve body by bolts; a valve stem is movably installed on the valve cover;

[0006] a sleeve assembly, wherein the sleeve assembly is disposed in the inner cavity of the valve body, and the bottom of the sleeve assembly is connected to the valve seat;

[0007] The valve core assembly comprises a large valve core slidably connected to the inner cavity of the sleeve assembly, a small valve core arranged in the accommodating cavity at the top of the large valve core, and the small valve core is fixedly connected to the valve stem;

[0008] a labyrinth disc assembly, brazed to the lower portion of the large valve core;

[0009] A guide sealing ring, wherein the inner ring of the guide sealing ring is connected to the upper end of the side wall of the large valve core through interference fit, and the outer ring of the guide sealing ring is sealed to the inner cavity of the sleeve assembly.

[0010] Furthermore, the sleeve includes an upper sleeve and a lower sleeve arranged at the bottom of the upper sleeve; the lower sleeve is provided with a plurality of noise reduction holes.

[0011] Furthermore, the inner cavity of the large valve core is provided with a small valve core valve seat, and the small valve core valve seat is fixed to the inner cavity of the large valve core by welding. The area between the top of the small valve core valve seat and the top of the large valve core is an accommodating cavity for accommodating the small valve core, and the bottom of the accommodating cavity extends upward to form a guide column, and the top of the guide column is through-connected with the bottom of the small valve core valve seat.

[0012] Furthermore, a butterfly spring is sleeved on the outer wall of the guide column, and two ends of the butterfly spring respectively abut against the top of the small valve core base and the bottom of the small valve core.

[0013] Furthermore, a pressure plate placement groove is provided on the top of the large valve core, and the pressure plate is arranged in the pressure plate placement groove and fixed to the large valve core by bolts.

[0014] Furthermore, at least two annular grooves are provided on the top of the side wall of the large valve core, and the thickness of the grooves matches the thickness of the guide sealing ring.

[0015] Furthermore, the outer wall of the installed guide sealing ring extends beyond the side wall of the large valve core.

[0016] Furthermore, the valve body is provided with a medium inlet and a medium outlet, the medium inlet is connected to the outside world and the lower sleeve; the medium outlet is connected to the outside world and the bottom of the large valve core.

[0017] Furthermore, the guide sealing ring is made of a wear-resistant and high-temperature resistant metal material.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The valve core components of a high-temperature and high-pressure control valve of the utility model include a small valve core, a large valve core, a disc spring, a guide sealing ring and a fastening screw, etc. Each part forms an integral part. A stable multi-guide structure is formed between the large valve core and the metal sealing guide ring, the upper sleeve, the lower sleeve and the valve seat, thereby improving the operating stability of the valve core.

[0020] 2. The utility model provides a high-temperature and high-pressure control valve with a labyrinth disc assembly at the lower part of the large valve core. The labyrinth disc assembly is composed of multiple layers of labyrinth discs. Each layer of labyrinth discs contains multiple groups of labyrinth flow channels, which can not only achieve flow regulation but also play the role of multi-stage pressure reduction and noise reduction to protect the valve internals, and can reduce flash evaporation and cavitation to a certain extent.

[0021] 3. The utility model provides a metal guide sealing ring for a high-temperature and high-pressure control valve. As a guide sealing part between the valve core component and the upper guide sleeve, it is very hard and wear-resistant. It can maintain stable guidance under high-temperature and high-pressure working conditions, and can also play an auxiliary sealing role to compensate for leakage between the small valve core and the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 This is an overall schematic diagram of a high-temperature and high-pressure control valve of the utility model;

[0024] Figure 2 This is a schematic diagram of a valve core assembly of a high-temperature and high-pressure control valve of the utility model;

[0025] Figure 3 This is a schematic diagram of a large valve core of a high-temperature and high-pressure control valve of the utility model;

[0026] Figure 4 This is a schematic diagram of a guide sealing ring of a high-temperature and high-pressure control valve of the utility model;

[0027] Figure 5 This is a schematic diagram of a labyrinth disc of a high-temperature and high-pressure control valve of the utility model.

[0028] Reference numerals

[0029] 1: valve body;

[0030] 2: Valve cover;

[0031] 3: valve stem;

[0032] 4: Sleeve assembly;

[0033] 41: Upper sleeve; 42: Lower sleeve; 43: Noise reduction hole;

[0034] 5: Valve core assembly;

[0035] 51: Large valve core; 52: Small valve core; 53: Butterfly spring;

[0036] 511: small valve core valve seat; 512: guide column;

[0037] 6: Maze disc assembly;

[0038] 7: Guide sealing ring;

[0039] 8: Press plate. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] See also Figure 1-5 The technical solution of a high-temperature and high-pressure control valve provided in this embodiment includes the following:

[0042] A valve body 1, wherein a valve seat is provided at the bottom of the inner cavity of the valve body 1, and the valve seat is fixedly connected to the valve body 1; a valve cover 2 is provided on the top of the valve body 1, and the valve cover 2 is connected to the valve body 1 by bolts; a valve stem 3 is movably mounted on the valve cover 2;

[0043] a sleeve assembly 4, wherein the sleeve assembly 4 is disposed in the inner cavity of the valve body 1, and the bottom of the sleeve assembly 4 is in contact with the valve seat;

[0044] The valve core assembly 5 includes a large valve core 51 slidably connected to the inner cavity of the sleeve assembly 4, and a small valve core 52 disposed in the accommodating cavity at the top of the large valve core 51. The small valve core 52 is fixedly connected to the valve stem 3;

[0045] The labyrinth disc assembly 6 is brazed to the lower part of the large valve core 51 and is composed of multiple layers of labyrinth discs. Each layer of labyrinth discs contains multiple groups of labyrinth flow channels, which can not only achieve flow regulation but also play a role in reducing pressure and noise, preventing cavitation and erosion, protecting the valve trim, reducing damage to the valve trim, and extending the service life of the valve;

[0046] The guide sealing ring 7 has an inner ring that is interference-fitted with the upper end of the side wall of the large valve core 51 , and an outer ring that is sealed with the inner cavity of the sleeve assembly 4 .

[0047] Specifically, the sleeve includes an upper sleeve 41 and a lower sleeve 42 provided at the bottom of the upper sleeve 41 ; the lower sleeve 42 is provided with a plurality of noise reduction holes 43 .

[0048] In a specific implementation, when the valve is opened, the small valve core 52 moves upward under the drive of the valve stem 3, opening the sealing surface where the lower end face of the small valve core 52 contacts the upper end face of the guide column 512. After the upper end face of the small valve core 52 contacts the pressure plate 8, it stops moving upward relative to the large valve core 51. At this time, under the continued action of the valve stem 3, the large valve core 51 begins to move upward, opening the valve channel.

[0049] Specifically, the inner cavity of the large valve core 51 is provided with a small valve core valve seat 511, and the small valve core valve seat 511 is fixed to the inner cavity of the large valve core 51 by welding. The area between the top of the small valve core valve seat 511 and the top of the large valve core 51 is an accommodating cavity for accommodating the small valve core 52, and the bottom of the accommodating cavity extends upward to form a guide column 512, and the top of the guide column 512 is through-connected with the bottom of the small valve core valve seat 511.

[0050] Specifically, a butterfly spring 53 is sleeved on the outer wall of the guide column 512 , and two ends of the butterfly spring 53 respectively abut against the top of the small valve core base 511 and the bottom of the small valve core 52 .

[0051] Specifically, a pressure plate placement groove is provided on the top of the large valve core 51 , and the pressure plate 8 is arranged in the pressure plate placement groove and fixed to the large valve core 51 by bolts.

[0052] Specifically, at least two annular grooves are provided on the top of the side wall of the large valve core 51 , the thickness of the grooves matches the thickness of the guide sealing ring 7 , and the outer wall of the installed guide sealing ring 7 extends beyond the side wall of the large valve core 51 .

[0053] In specific implementation, compared with the traditional valve core and sleeve that are prone to wear and tear, the outer diameter of the guide sealing ring 7 of this design exceeds the large valve core 51. The outer diameter of the guide sealing ring 7 and the sleeve assembly 4 can achieve sealing while also guiding sliding. The guide sealing ring 7 made of hard metal is more wear-resistant and has a longer service life.

[0054] Specifically, the valve body 1 is provided with a medium inlet ( Figure 1 Right channel) and media outlet ( Figure 1 The left channel, the medium inlet is connected to the outside and the lower sleeve 42; the medium outlet is connected to the outside and the bottom of the large valve core 51.

[0055] In a specific implementation, when the valve is opened, the medium enters the noise reduction hole 43 from the medium inlet, flows through the labyrinth disc assembly 6, and then flows into the medium outlet from the inner cavity below the large valve core 51.

[0056] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A high temperature and high pressure control valve, characterized in that: include: A valve body, wherein a valve seat is provided at the bottom of the inner cavity of the valve body, and the valve seat is fixedly connected to the valve body; a valve cover is provided at the top of the valve body, and the valve cover is connected to the valve body by bolts; a valve stem is movably installed on the valve cover; a sleeve assembly, wherein the sleeve assembly is disposed in the inner cavity of the valve body, and the bottom of the sleeve assembly is connected to the valve seat; The valve core assembly comprises a large valve core slidably connected to the inner cavity of the sleeve assembly, a small valve core arranged in the accommodating cavity at the top of the large valve core, and the small valve core is fixedly connected to the valve stem; a labyrinth disc assembly, brazed to the lower portion of the large valve core; A guide sealing ring, wherein the inner ring of the guide sealing ring is connected to the upper end of the side wall of the large valve core through interference fit, and the outer ring of the guide sealing ring is sealed to the inner cavity of the sleeve assembly.

2. The high-temperature and high-pressure control valve according to claim 1, characterized in that: The sleeve comprises an upper sleeve and a lower sleeve arranged at the bottom of the upper sleeve; the lower sleeve is provided with a plurality of noise reduction holes.

3. The high-temperature and high-pressure control valve according to claim 1, characterized in that: The inner cavity of the large valve core is provided with a small valve core valve seat, and the small valve core valve seat and the inner cavity of the large valve core are fixed by welding. The area between the top of the small valve core valve seat and the top of the large valve core is an accommodating cavity for accommodating the small valve core, and the bottom of the accommodating cavity extends upward to form a guide column, and the top of the guide column is through-connected with the bottom of the small valve core valve seat.

4. The high-temperature and high-pressure control valve according to claim 3, characterized in that: The outer wall of the guide column is sleeved with a butterfly spring, and the two ends of the butterfly spring respectively abut against the top of the small valve core base and the bottom of the small valve core.

5. The high-temperature and high-pressure control valve according to claim 3, characterized in that: A pressure plate placement groove is provided on the top of the large valve core, and the pressure plate is arranged in the pressure plate placement groove and fixed to the large valve core by bolts.

6. The high-temperature and high-pressure control valve according to claim 1, characterized in that: At least two annular grooves are provided on the top of the side wall of the large valve core, and the thickness of the grooves matches the thickness of the guide sealing ring.

7. The high-temperature and high-pressure control valve according to claim 3, characterized in that: The outer wall of the installed guide sealing ring extends beyond the side wall of the large valve core.

8. The high-temperature and high-pressure control valve according to claim 2, characterized in that: The valve body is provided with a medium inlet and a medium outlet. The medium inlet is connected with the outside world and the lower sleeve; the medium outlet is connected with the outside world and the bottom of the large valve core.

9. The high-temperature and high-pressure control valve according to claim 1, characterized in that: The guide sealing ring is made of a wear-resistant and high-temperature resistant metal material.

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