Four-way stop valve

Abstract

A four-way stop valve comprises stop valves, each stop valve mainly comprises an executing mechanism, a support, a valve rod and a valve seat sealing face, the three stop valves are arranged in the space at an angle of 60 degrees to form a four-way umbrella-shaped stop valve, the four-way valve comprises three branch flow channels and a main body flow channel, and the branch flow channels and the main body flow channel are communicated through a spherical cavity in the middle; a spherical crown type scraper is arranged at the end of the valve rod, a sealing face is arranged on the portion, behind the spherical crown type scraper, of the valve rod, the profile curve of the spherical crown type scraper is matched with the notch in the spherical cavity, and the inner concave face of the spherical crown type scraper is matched with a spherical crown of the corresponding part of the inner surface of the spherical cavity. The inner surface of the spherical crown type scraper and the inner surface of the spherical cavity form a complete sphere; a guide groove is formed in the other end of the valve rod, and the guide groove and the guide pin move in a matched mode. According to the utility model, not only can a good sealing effect be ensured, but also the functions of reversing, shunting, collecting and the like of media can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of valve manufacturing technology, specifically relating to a four-way shut-off valve. Background Technology

[0002] With the rapid development of science and technology, the sealing requirements for valves are becoming increasingly stringent. Existing valve seat seals are generally located at the end of the closing element, causing the medium to directly erode the sealing surface, leading to seal failure and leakage. Furthermore, in some devices, the medium frequently cokes and adheres to the valve seat sealing surface and its surroundings, becoming trapped between the sealing surfaces during closure. This incomplete closure results in leakage and seal failure. Current technologies focus on improving the sealing structure to enhance sealing performance, but do not address the issue of improving the sealing location. Utility Model Content

[0003] This utility model provides a four-way shut-off valve that, in addition to ensuring a good sealing effect during operation, can also realize the functions of media reversal, diversion, and convergence.

[0004] Therefore, the technical solution adopted is as follows:

[0005] A four-way shut-off valve includes a shut-off valve, which mainly comprises an actuator, a bracket, a valve stem, and a valve seat sealing surface. Three of the shut-off valves are arranged at a 60-degree angle in space to form a four-way umbrella-shaped shut-off valve. The four-way configuration includes three branch flow channels and one main flow channel, which are connected by a central spherical cavity. The end of the valve stem is a spherical crown-shaped scraper, with a sealing surface on the valve stem behind the scraper. The contour curve of the scraper matches the notch on the spherical cavity, and the concave surface of the scraper matches the corresponding part of the spherical crown on the inner surface of the cavity. When the sealing surface on the valve stem and the valve seat sealing surface are tightly fitted to form a seal, the inner surface of the scraper and the inner surface of the cavity form a complete sphere. The other end of the valve stem is provided with a guide groove, which is adapted to the movement of a guide pin mounted on the bracket.

[0006] A guide bearing is installed at the end of the guide pin.

[0007] The concave surface of the spherical scraper is coated with a hard alloy coating.

[0008] The three branch channels, the spherical cavity, and the outer wall of the main channel are provided with heat insulation sleeves.

[0009] This invention is mainly used in shut-off valves for media containing coking particles that are prone to coking. In conventional shut-off valves, the valve stem tip is generally flat or conical. The valve stem head, shaped like a spherical crown, forms a complete spherical surface with the main spherical channel when closed, becoming part of it. The valve stem tip and channel are in a mating state, serving both a guiding function and preventing the medium from entering and eroding the sealing surface, thus ensuring a reliable seal. This invention provides reliable sealing, high precision, smooth medium flow, and extends the valve's service life. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the planar structure of this utility model;

[0011] Figure 2 This is a partial schematic diagram of the rotary guide spherical crown type scraper valve head of this utility model;

[0012] Figure 3 This is a schematic diagram of a spherical crown-type scraper valve head;

[0013] Figure 4 This is a three-dimensional structural diagram of the present invention;

[0014] In the diagram: 1. Handwheel; 2. Gearbox; 3. Bracket; 4. Guide pin; 5. Guide bearing; 6. Guide groove; 7. Valve stem; 8. Valve stem sealing surface; 9. Spherical scraper; 10. Branch flow channel; 11. Valve seat sealing surface; 12. Main spherical channel; 13. Insulation sleeve. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0016] Reference Figure 1 , Figure 2 , Figure 3 A four-way shut-off valve includes a shut-off valve, which mainly comprises an actuator, a bracket, a valve stem, and a valve seat sealing surface. Three of the shut-off valves are arranged at a 60-degree angle in space to form a four-way umbrella-shaped shut-off valve. The four-way configuration includes three branch flow channels and one main flow channel, which are connected by a central spherical cavity. The end of the valve stem 7 is a spherical crown-shaped scraper 9. A sealing surface 8 is provided on the valve stem behind the spherical crown-shaped scraper 9. The contour curve of the spherical crown-shaped scraper matches the notch on the spherical cavity, and the concave surface of the spherical crown-shaped scraper matches the corresponding part of the spherical crown on the inner surface of the spherical cavity. When the sealing surface on the valve stem and the sealing surface of the valve seat are tightly fitted to form a seal, the inner surface of the spherical crown-shaped scraper and the inner surface of the spherical cavity form a complete sphere. The other end of the valve stem is provided with a guide groove, which is adapted to the movement of a guide pin mounted on the bracket. A guide bearing 5 is installed at the end of the guide pin 4. The limit bearing reduces friction, so the valve stem only lifts and does not rotate.

[0017] In this invention, the sealing surface is positioned behind the closing element to avoid or reduce the direct scouring of the sealing surface by the medium.

[0018] In this invention, the three branch channels form a spherical cavity when closed. The opening and closing of different branches can reverse, divert, and converge the medium. Each passage forms a 60-degree angle in space, which satisfies both the requirement of non-interference in the operating space and the layout of the spherical cavity of the casting body and the branch channels.

[0019] The valve body of this utility model is integrally cast, and the butt-welded flange connection adopts the BW type. The valve stem and valve disc are a whole. Each channel has an independent operating mechanism to control the flow or cut-off of the medium, and it will not be affected by other flow control systems. It is convenient and flexible to operate and maintain.

[0020] The concave surface of the spherical scraper 9 is coated with a hard alloy coating. This prevents media from eroding the surface, and in the closed state, it prevents media from eroding the sealing surface.

[0021] The three branch flow channels, the spherical cavity, and the outer wall of the main flow channel are equipped with heat insulation sleeves 13. When the medium is in a slurry state, hot steam can be passed through to prevent crystallization. The hot steam passing through the heat insulation sleeve ensures that the medium temperature will not drop, causing crystallization or coking, thus ensuring reliable valve sealing.

[0022] In the working process of this utility model, when the valve is opened or closed, the actuator drives the valve stem to move. The valve stem only rises and falls without rotating. The spherical crown-shaped scraper scrapes and cleans the deposits around the valve seat, ensuring the cleanliness of the area around the valve seat. When the valve stem is raised and the guide pin reaches the top of the guide groove, the valve stem stops rising and reaches the fully open state. At this time, the spherical crown-shaped valve head connects with the branch flow channel, and the medium flows through smoothly, reducing flow resistance. Similarly, when closing, the actuator drives the valve stem to move, and the movement trajectory follows the guide groove on the valve stem. The guide pin drives the guide bearing to slide in the guide groove. The spherical crown-shaped scraper scrapes and cleans the deposits around the valve seat again in the opposite direction of the rising motion, ensuring the cleanliness of the area around the valve seat again. When the valve stem sealing surface and the valve seat sealing surface are in contact, the closed state is reached. At this time, the spherical crown-shaped valve head and the spherical cavity of the valve body form an integral spherical surface. The front end of the valve stem also forms part of this spherical cavity, hence the name spherical crown-shaped valve head. The medium flowing through the middle cavity cannot reach the sealing surface, thus achieving a reliable seal. The length of the "shovel" shape formed by this spherical crown valve head depends on the eccentricity between the center of the valve stem and the cavity. The greater the eccentricity, the longer the shovel shape, and vice versa.

[0023] See Figure 3The bottom of the spherical scraper 9 is a shovel-shaped scraper structure, and the concave surface of the shovel is part of the spherical inner surface of the main spherical channel 11. The shovel shape is relatively sharp, which can play a self-cleaning role during the opening and closing process, scraping away the medium adhering to the valve seat to ensure that there is no residue between the sealing surfaces during the closing process, and the sealing is reliable.

Claims

1. A four-way gate valve, comprising a gate valve, the gate valve mainly including an actuator, a bracket, a valve stem, and a valve seat sealing surface, characterized in that, The three shut-off valves are arranged in a 60-degree spatial arrangement to form a four-way umbrella-shaped shut-off valve. The four-way valve includes three branch flow channels and one main flow channel. The branch flow channels and the main flow channel are connected by a central spherical cavity (12). The end of the valve stem (7) is a spherical crown scraper (9). A sealing surface (8) is provided on the valve stem behind the spherical crown scraper (9). The contour curve of the spherical crown scraper (9) is adapted to the notch on the spherical cavity (12). The concave surface of the spherical crown scraper (9) is adapted to the corresponding part of the spherical crown on the inner surface of the spherical cavity (12). When the sealing surface (8) on the valve stem (7) is tightly fitted with the valve seat sealing surface (11) of the shut-off valve to form a seal, the inner surface of the spherical crown scraper (9) and the inner surface of the spherical cavity (12) form a complete sphere. The other end of the valve stem (7) is provided with a guide groove (6). The guide groove (6) is adapted to the movement of the guide pin (4) installed on the bracket.

2. A four-way shut-off valve according to claim 1, characterized in that, The end of the guide pin (4) is fitted with a guide bearing (5).

3. A four-way shut-off valve according to claim 1, characterized in that, The concave surface of the spherical scraper (9) is provided with a hard alloy coating.

4. A four-way shut-off valve according to claim 1, characterized in that, The three branch channels, the spherical cavity (12), and the outer wall of the main channel are provided with heat insulation sleeves (13).

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