Steam extraction check valve

Abstract

The utility model provides a steam extraction check valve which comprises a steam extraction check valve body and a round shell above the steam extraction check valve body, a reinforcing plate is arranged on the side edge of the round shell, and the other side of the round shell is connected with an inlet flange. The inlet flange is provided with a sealing groove and a pipe opening connecting hole, and connection sealing performance is guaranteed. The in-valve guide rod guides the base valve clack to move, and the limiting check ring prevents the valve clack from excessively rising. The buffering damping piston enables the valve to be opened and closed more stably, and impact and abrasion are reduced. The reset spring assists the valve in timely responding to the steam flow direction change. The left and right inlet flanges are symmetrical to adapt to multidirectional steam inlets. U-shaped positioning holes and positioning flanges of the mounting plate facilitate mounting and positioning. The steam extraction check valve is stable in structure, good in sealing performance, reliable in performance, convenient to install and maintain and capable of effectively preventing steam from flowing back and guaranteeing safe operation of a steam system.

Description

Technical Field

[0001] The utility model relates to the field of check valves, and more specifically, to a steam extraction check valve. Background Art

[0002] The steam extraction check valve is mainly used to prevent the reverse flow of steam medium, ensuring the normal operation of the system and the safety of equipment. Traditional steam extraction check valves mostly adopt a base valve flap structure. During the opening or closing process of the valve, the movement of the valve flap mainly depends on the medium pressure and the spring return force. However, the existing technologies generally have the following several defects:

[0003] Firstly, when the valve is opened, due to the fast flow rate and large thrust of the steam, the base valve flap in the traditional structure is likely to rapidly rise due to the instantaneous impact force, resulting in a violent collision between the valve flap and the valve cover or other components. This not only generates a large amount of noise but may also cause damage to the sealing surface or structural fatigue, affecting the service life of the valve. Secondly, the surface of the inlet flange in the existing technologies is mostly a flat structure, without a special sealing positioning structure or sealing groove. As a result, the sealing gasket is prone to offset, uneven extrusion, or even detachment during installation and use, affecting the reliability of the seal. Especially in high-temperature and high-pressure steam conditions, the sealing gasket is more likely to experience seal failure due to heat expansion or compression deformation, causing steam leakage. This not only wastes energy but may also pose safety hazards. Finally, in terms of installation, the existing steam extraction check valves usually adopt a fixed installation structure, lacking a flexible adjustment function. During on-site installation, it is prone to problems such as difficult alignment and large installation errors, affecting the sealing performance and operation stability of the valve.

[0004] The existing steam extraction check valves have obvious deficiencies in terms of structural design, buffering performance, response speed, and installation adaptability. There is an urgent need for an improved steam extraction check valve that can effectively relieve the impact force, improve the response speed, and enhance the sealing reliability during the opening and closing processes. Therefore, a steam extraction check valve is proposed. Content of the Utility Model

[0005] The purpose of the present utility model is to address the problems raised in the existing background art. To achieve the above-mentioned utility model purpose, the present utility model provides the following technical solution: A steam extraction check valve, comprising a steam extraction check valve body, and a circular housing provided above the steam extraction check valve body. It is characterized in that a reinforcement plate is fixed on the side edge of the circular housing, and the other side is connected to the inlet flange, and the reinforcement plate and the inlet flange are symmetrically arranged. The inlet flange is provided with a flange sealing groove, the outer edge of the inlet flange is embedded with pipe connection holes, a rotation limit pin is provided at the center of the front end of the circular housing, a guide rod is embedded inside the steam extraction check valve body and the valve seat of the valve body, and a base valve flap is installed on the bottom rod of the guide rod.

[0006] As a preferred technical solution of the present invention, a mounting plate is installed at the rear of the circular shell, U-shaped positioning holes are embedded on the four sides of the mounting plate, and mounting bolt holes are provided at the four corners of the mounting plate.

[0007] As a preferred technical solution of the present invention, a valve body seat is installed below the steam extraction check valve body, and the base valve disc is located inside the valve body seat.

[0008] As a preferred technical solution of the present invention, a buffer damping piston is connected to the top of the base valve disc, and the buffer damping piston is located in the steam extraction check valve body.

[0009] As a preferred technical solution of the present invention, a limit retaining ring is installed on the top of the guide rod, and the limit retaining ring is located at the top inside the base valve disc.

[0010] As a preferred technical solution of the present invention, a return spring is provided inside the steam extraction check valve body, and a spring seat is installed at the bottom of the return spring.

[0011] As a preferred technical solution of the present invention, a left inlet flange is connected to the left pipe opening of the base valve disc, and a right inlet flange is provided in the right pipe opening, and the left inlet flange and the right inlet flange are symmetrically arranged.

[0012] As a preferred technical solution of the present invention, the left inlet flange and the right inlet flange are both provided with flow channel inner walls.

[0013] As an optimal technical solution of the present invention, a positioning flange is installed below the valve body and valve seat.

[0014] Compared with existing technologies, this invention offers the following advantages: the reinforcement plates fixed to the sides of the circular housing are symmetrically arranged with the inlet flange, enhancing the structural strength of the circular housing. Under conditions of high-speed steam flow and pressure fluctuations, this effectively prevents deformation or damage to the circular housing due to uneven forces, thereby improving the overall stability and reliability of the valve and extending its service life.

[0015] The guide rod embedded within the extraction check valve body and valve seat of this utility model provides precise guidance for the movement of the base disc. A limit ring mounted on top of the guide rod, located at the uppermost position within the base disc, accurately limits the rise of the base disc, preventing it from rising out of its normal operating position due to excessive movement, ensuring normal opening and closing of the valve.

[0016] The inlet flange of this utility model is provided with a flange sealing groove, which can be placed with a sealing gasket when connecting to the external pipeline. This design can effectively improve the sealing of the connection part, prevent steam leakage, reduce energy loss, and also avoid the safety hazards that may be caused by steam leakage.

[0017] In the utility model, the buffer damping piston connected to the top end of the base valve flap plays an important buffering role during the opening and closing processes of the valve. When the valve is opened, the buffer damping piston moves in the medium inside the extraction check valve body, generating resistance to prevent the base valve flap from rising rapidly due to excessive steam thrust and reducing the impact force on the valve components. When the valve is closed, it can also slow down the descending speed of the base valve flap, making the closing process smoother, reducing the impact force and noise at the moment of closing, and reducing component wear.

[0018] The return spring and spring seat inside the extraction check valve body of the utility model cooperate well. The return spring has an appropriate elastic coefficient, which can be compressed when the steam flows in the forward direction and quickly release the elastic force to push the base valve flap to close when the steam flows in the reverse direction. This spring design ensures that the valve can respond promptly and accurately to changes in the steam flow direction, improving the working efficiency and reliability of the valve.

[0019] The left inlet flange connected inside the left pipe opening of the base valve flap and the right inlet flange inside the right pipe opening of the utility model are symmetrically arranged, and both have a flow channel inner wall inside. This design enables the valve to adapt to steam inlet requirements in different directions, increasing the installation flexibility and applicability of the valve, and it can be applied to various complex steam system layouts.

[0020] The mounting plate installed at the tail of the circular shell of the utility model has U-shaped positioning holes embedded on its four sides and mounting bolt holes at its four corner ends. The U-shaped positioning holes facilitate certain position adjustments during installation, enabling the valve to accurately align with the installation position; the mounting bolt holes are used to fix the mounting plate in the corresponding position using bolts, simplifying the installation process and improving the installation efficiency.

[0021] The positioning flange installed below the valve seat of the valve body of the utility model can be used for positioning and cooperation with other components, ensuring the accurate installation position of the valve in the entire system and improving the installation accuracy and convenience. Description of the Drawings

[0022] Figure 1 is the structural schematic diagram provided for the utility model;

[0023] Figure 2 is the internal sectional structural schematic diagram provided for the utility model;

[0024] Figure 3 is the structural schematic diagram of the U-shaped positioning hole provided for the utility model;

[0025] Figure 4 is the front view structural schematic diagram provided for the utility model;

[0026] Figure 5 is the left view structural schematic diagram provided for the utility model;

[0027] Figure 6 This is the top view structural schematic diagram provided by the present utility model.

[0028] Labels in the figure:

[0029] 1. Extraction check valve body; 2. Circular housing; 3. Reinforcement plate; 4. Inlet flange; 5. Flange sealing groove; 6. Pipe connection hole; 7. Mounting plate; 8. U-shaped positioning hole; 9. Mounting bolt hole; 10. Rotation limit pin; 11. Valve body seat; 12. Guide rod; 13. Base valve flap; 14. Buffer damping piston; 15. Limit retaining ring; 16. Return spring; 17. Spring seat; 18. Left inlet flange; 19. Right inlet flange; 20. Inner wall of flow channel; 21. Positioning flange. Specific embodiments

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0031] Therefore, the following detailed description of the embodiments of the present utility model is not intended to limit the scope of the claimed present utility model, but merely represents some embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments may be combined with each other. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] Embodiment 1: An extraction check valve includes an extraction check valve body 1 and a circular housing 2 provided above the extraction check valve body 1. It is characterized in that a reinforcement plate 3 is fixed on the side of the circular housing 2, and the other side is connected to an inlet flange 4, and the reinforcement plate 3 and the inlet flange 4 are symmetrically arranged. The inlet flange 4 is provided with a flange sealing groove 5, and a pipe connection hole 6 is embedded on the outer edge of the inlet flange 4. A rotation limit pin 10 is provided at the center of the front end of the circular housing 2. A guide rod 12 is embedded inside the extraction check valve body 1 and the valve body seat 11, and a base valve flap 13 is installed on the bottom rod of the guide rod 12.

[0033] At the tail of the circular shell 2, there is an installation plate 7. U-shaped positioning holes 8 are embedded on the four sides of the installation plate 7, and installation bolt holes 9 are provided at the four corner ends of the installation plate 7. Below the extraction check valve body 1, there is a valve body seat 11, and the base valve flap 13 is located inside the valve body seat 11. At the top of the base valve flap 13, there is a buffer damping piston 14, and the buffer damping piston 14 is located inside the extraction check valve body 1. At the top of the guide rod 12, there is a limit retaining ring 15, and the limit retaining ring 15 is located at the uppermost part inside the base valve flap 13. Inside the extraction check valve body 1, there is a return spring 16, and at the bottom of the return spring 16, there is a spring seat 17.

[0034] Inside the left pipe opening of the base valve flap 13, there is a left inlet flange 18 connected, and inside the right pipe opening, there is a right inlet flange 19. The left inlet flange 18 and the right inlet flange 19 are symmetrically arranged. Inside both the left inlet flange 18 and the right inlet flange 19, there is a flow channel inner wall 20. Below the valve body seat 11, there is a positioning flange 21.

[0035] Working principle of the extraction check valve: The extraction check valve is mainly used to prevent steam backflow and ensure the safe and stable operation of the system. When the steam flows forward, the valve opens. The steam enters from the inlet flange 4, and the flange sealing groove 5 on the inlet flange 4 ensures the sealing performance of the connection part and prevents steam leakage. The pipe connection hole 6 is used for connection and fixation with the external pipeline.

[0036] The steam enters the extraction check valve body 1 and the valve body seat 11 along the flow channel inner wall 20, generating an upward thrust on the base valve flap 13. Under the action of the steam thrust, the base valve flap 13 moves upward along the guide rod 12. The guide rod 12 plays a role in guiding the movement direction of the base valve flap 13 to ensure its smooth rise. At this time, the base valve flap 13 overcomes the elastic force of the return spring 16 and compresses the return spring 16, and the spring seat 17 provides support for the return spring 16.

[0037] The buffer damping piston 14 connected to the top of the base valve flap 13 plays a buffering role during the upward movement, avoiding the base valve flap 13 rising rapidly due to excessive steam thrust and generating a violent impact, reducing damage to the valve components, and also making the valve opening process more stable.

[0038] When the base valve flap 13 rises to a certain position, the limit retaining ring 15 at the top of the guide rod 12 restricts the further rise of the base valve flap 13 to prevent it from deviating from the normal working position.

[0039] When there is a tendency of steam backflow, the reverse steam pressure acts on the base valve flap 13. After losing the action of the forward steam thrust, the return spring 16 starts to release its elastic force, pushing the base valve flap 13 to move downward along the guide rod 12 until the base valve flap 13 fits tightly with the valve body seat 11 to prevent steam backflow.

[0040] The rotation limit pin 10 at the center of the front end of the circular housing 2 plays a certain limiting role in the movement of the circular housing 2, ensuring the stability of the entire valve structure and preventing unnecessary rotation of the circular housing 2 during the steam flow process, which may affect the normal operation of the valve. The mounting plate 7 at the tail of the circular housing 2 is installed and positioned through the U-shaped positioning hole 8 and the mounting bolt hole 9. The U-shaped positioning hole 8 facilitates a certain position adjustment during installation, and the mounting bolt hole 9 is used to fix the mounting plate 7 in the corresponding position with bolts.

[0041] The positioning flange 21 installed below the valve body valve seat 11 can be used for positioning and installation with other components. The reinforcement plate 3 on the side of the circular housing 2 is symmetrically arranged with the inlet flange 4. The reinforcement plate 3 enhances the structural strength of the circular housing 2 and improves the overall stability and reliability of the valve.

[0042] Working process of the extraction check valve: When the steam has not entered the extraction check valve, the return spring 16 is in a natural extended state, pushing the base valve flap 13 tightly against the valve body valve seat 11. At this time, the extraction check valve is in a closed state, preventing the flow of steam. The circular housing 2 maintains a stable position through the rotation limit pin 10, and the reinforcement plate 3 and the inlet flange 4 are symmetrically distributed, providing stable support for the circular housing 2.

[0043] Steam flows into the extraction check valve from the external pipeline through the inlet flange 4. A sealing gasket is usually placed in the flange sealing groove 5 on the inlet flange 4 to ensure the sealing performance at the connection after connecting with the external pipeline and prevent steam leakage. The pipe connection hole 6 is used for bolt connection to firmly fix the inlet flange 4 to the external pipeline.

[0044] Steam enters the extraction check valve body 1 and the valve body valve seat 11 along the inner wall 20 of the flow channels inside the left inlet flange 18 and the right inlet flange 19. As the steam flow rate and pressure increase, the steam generates an upward thrust on the base valve flap 13.

[0045] When the steam thrust is greater than the elastic force of the return spring 16, the base valve flap 13 begins to move upward along the guide rod 12. The guide rod 12 plays a role in precisely guiding the movement direction of the base valve flap 13, ensuring its smooth upward movement and avoiding swaying or deviation.

[0046] During the upward movement of the buffer damping piston 14 connected to the top of the base valve flap 13, it moves in the medium inside the extraction check valve body 1. Due to the resistance of the medium, the buffer damping piston 14 provides a buffering effect for the upward movement of the base valve flap 13, preventing the base valve flap 13 from rising rapidly due to excessive steam thrust, reducing the impact force on the valve components, and extending the service life of the valve.

[0047] The base valve flap 13 continues to rise until the limit retaining ring 15 at the top of the guide rod 12 contacts the uppermost part inside the base valve flap 13, restricting the further rise of the base valve flap 13. At this time, the valve reaches the maximum opening state, and steam can pass through the extraction check valve smoothly.

[0048] When there is a reverse flow trend of steam, the reverse steam pressure acts rapidly on the base valve flap 13. After losing the forward steam thrust, the return spring 16 begins to release the stored elastic potential energy, generating a downward thrust. Under the combined action of the reverse steam pressure and the elastic force of the return spring 16, the base valve flap 13 moves rapidly downward along the guide rod 12. The base valve flap 13 gradually approaches the valve body seat 11 until the two are closely fitted to form a seal, effectively preventing the reverse flow of steam. During the closing process, the buffer damping piston 14 also plays a buffering role, making the closing process smoother and reducing the impact force and noise at the moment of closing.

[0049] The rotation limit pin 10 at the front end of the circular housing 2 restricts the rotation of the circular housing 2, ensuring its stable position during the steam flow process and preventing unnecessary rotation due to the impact of steam, thus guaranteeing the stability and reliability of the entire valve structure.

[0050] The mounting plate 7 at the tail of the circular housing 2 is installed and positioned through the U-shaped positioning hole 8 and the mounting bolt hole 9. The U-shaped positioning hole 8 facilitates fine adjustment during installation to ensure the accurate installation position of the circular housing 2. The mounting bolt hole 9 is used for installing bolts to firmly fix the mounting plate 7 on the corresponding mounting base.

[0051] The positioning flange 21 below the valve body seat 11 cooperates with other components to achieve the precise installation and positioning of the valve in the entire system, ensuring the connection accuracy and stability between the valve and other pipelines and equipment.

[0052] The above embodiments are only used to illustrate the present invention rather than to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above respective embodiments, the present invention is not limited to the above specific implementation manners. Therefore, any modification or equivalent replacement to the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention are covered within the scope of the claims of the present invention.

Claims

1. A steam extraction check valve, comprising a steam extraction check valve body (1), and a circular shell (2) arranged above the steam extraction check valve body (1), characterized in that: A reinforcing plate (3) is fixed on the side of the circular shell (2), and the other side is connected to the inlet flange (4), and the reinforcing plate (3) and the inlet flange (4) are symmetrically arranged, wherein the inlet flange (4) is provided with a flange sealing groove (5), and the outer edge of the inlet flange (4) is embedded with a pipe mouth connecting hole (6), and a rotation limit pin (10) is provided at the center of the front end of the circular shell (2), and a guide rod (12) is embedded inside the steam extraction check valve body (1) and the valve body valve seat (11), and a base valve disc (13) is installed on the bottom rod of the guide rod (12).

2. The steam extraction check valve according to claim 1, characterized in that: A mounting plate (7) is installed at the rear of the circular shell (2), U-shaped positioning holes (8) are embedded on the four sides of the mounting plate (7), and mounting bolt holes (9) are provided at the four corner ends of the mounting plate (7).

3. The steam extraction check valve according to claim 2, characterized in that: A valve body seat (11) is installed below the steam extraction check valve body (1), and the base valve disc (13) is located inside the valve body seat (11).

4. The steam extraction check valve according to claim 3, characterized in that: The top end of the base valve disc (13) is connected to a buffer damping piston (14), and the buffer damping piston (14) is located in the steam extraction check valve body (1).

5. The steam extraction check valve according to claim 4, characterized in that: A limit retaining ring (15) is installed on the top of the guide rod (12), and the limit retaining ring (15) is located at the top inside the base valve disc (13).

6. The steam extraction check valve according to claim 5, characterized in that: A return spring (16) is provided inside the steam extraction check valve body (1), and a spring seat (17) is installed at the bottom of the return spring (16).

7. The steam extraction check valve according to claim 6, characterized in that: A left inlet flange (18) is connected to the left pipe opening of the base valve disc (13), while a right inlet flange (19) is provided in the right pipe opening. The left inlet flange (18) and the right inlet flange (19) are symmetrically arranged.

8. The steam extraction check valve according to claim 7, characterized in that: The left inlet flange (18) and the right inlet flange (19) are both provided with flow channel inner walls (20).

9. The steam extraction check valve according to claim 8, characterized in that: A positioning flange (21) is installed below the valve body seat (11).

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