Single-seat regulating valve

Abstract

The utility model discloses a single-seat regulating valve, which is different from a single-seat regulating valve with an integrated bottom, is convenient for a worker to operate when a valve body needs to be polished or electrolyzed, and is beneficial to improving the machining precision and increasing the industrial production efficiency. The valve comprises a valve body, a valve cover is inserted into the top of the valve body, and a first flow channel, a main flow channel and a second flow channel which are arranged in the valve body are connected and communicated, and is characterized in that a concave part at the bottom of the valve body is a processing sealing surface, the main flow channel extends outwards from the interior of the valve body and penetrates through the processing sealing surface, and a bottom flange is arranged at a port of the main flow channel; the bottom flange is of a solid blanking cap structure, the valve body and the bottom flange are sleeved with each other and are fixed through side bolts and nuts, and a tooth-shaped pad is arranged at the joint of the valve body and the bottom flange.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valve devices, in particular to a single-seat regulating valve. Background Art

[0002] Single-seat control valves are generally cast cavity valve bodies with S-shaped flow channels. They have the advantages of smooth fluid flow, low erosion, and weak vibration. They are usually used in high-end chemical industries such as biopharmaceuticals, new material research and development, and electronic special materials. Therefore, the media inside the single-seat control valves are mostly organic solvents, high-purity reagents, etc., and all parts inside the single-seat control valves that come into contact with the media have very high requirements on the surface and need to avoid reacting with the media. Therefore, after the single-seat control valve is manufactured and formed, it is necessary to perform electrolysis, internal polishing and other processes on the inside to meet the industrial needs of corrosion resistance and impurity-free. However, most of the existing single-seat control valves have an integrated bottom, which brings great inconvenience to the staff when the valve body needs to be polished or electrolyzed, resulting in reduced processing accuracy and affecting the efficiency of industrial production. Utility Model Content

[0003] In view of the disadvantage that most of the existing single-seat regulating valves have an integrated bottom design, which brings great inconvenience to the staff when the valve body needs to be polished or electrolyzed, resulting in reduced processing accuracy, the utility model provides a single-seat regulating valve, which is different from the single-seat regulating valve with an integrated bottom. It is convenient for the staff to operate when the valve body needs to be polished or electrolyzed, which is conducive to improving processing accuracy and increasing industrial production efficiency.

[0004] The utility model provides the following technical solutions:

[0005] It includes a valve body, a valve cover is inserted into the top of the valve body, and the first flow channel, the main flow channel and the second flow channel arranged inside the valve body are connected to each other. It is characterized in that: the bottom of the valve body is concave, and the concave surface is a machined sealing surface. The main flow channel extends outward from the inside of the valve body to pass through the machined sealing surface. A bottom flange is provided at the opening of the main flow channel. The bottom flange is a solid plugging cover structure. The valve body and the bottom flange are nested with each other and fixed by side bolts and nuts. A toothed pad is provided at the connection between the valve body and the bottom flange.

[0006] It is further characterized by:

[0007] In the valve cover, a packing structure is arranged around the valve stem, and the packing structure includes a packing seat, a packing spring, a packing, and a packing gland. The packing is a "V"-shaped packing. The gap formed between the valve stem and the valve cover first narrows and then widens from top to bottom. The packing seat is installed at the gap change location. The packing spring and the packing are arranged in sequence above the packing seat. The packing gland is press-fitted onto the packing. A packing pressure plate is provided on the packing gland, and the packing pressure plate fixes the packing gland with bolts and nuts.

[0008] A valve stem is provided inside the valve cover, and a valve core is provided inside the valve body. At the connection between the valve body and the valve cover, the head of the valve stem is inserted into the tail end of the valve core. An adapted guide sleeve is installed at the tail end of the valve core, and its head extends into the main flow channel of the valve body. The guide sleeve is fixedly installed inside the valve cover;

[0009] A toothed pad is provided at the connection between the valve body and the valve cover.

[0010] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0011] The setting of the bottom flange makes it easy to work on the inside of the valve body by simply removing the bottom flange when electrolysis or polishing is required. The main flow channel at the bottom is convenient for the staff to operate and can process in place, thus improving the processing accuracy.

[0012] The concave surface at the bottom of the valve body is directly used as the processing sealing surface, which not only facilitates the processing of the staff but also avoids accidental wear during the assembly process, which is conducive to ensuring the processing accuracy;

[0013] Toothed pads increase the sealing performance of the joints between components, while packing springs and V-shaped packings enhance valve sealing performance.

[0014] The guide sleeve can serve as a guide fitting surface to ensure the coaxiality of the valve core and the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the overall structure of the utility model.

[0016] Description of reference numerals:

[0017] 1. Valve body; 2. Valve cover; 3. Bottom flange; 4. Valve core; 5. Valve stem; 6. Guide sleeve; 7. Toothed gasket; 8. Packing seat; 9. Packing spring; 10. Packing; 11. Packing gland; 12. Packing pressure plate; 13. Spring base gasket; 14. Dust ring; 15. First flow channel; 16. Second flow channel; 17. Main flow channel. DETAILED DESCRIPTION

[0018] The utility model provides Figure 1A single-seat regulating valve is shown, which includes a valve body 1. A valve cover 2 is inserted into and installed on the top of the valve body 1. A first flow channel 15, a main flow channel 17, and a second flow channel 16 are provided inside the valve body 1 and are connected and communicated. The bottom of the valve body 1 is concave, and the concave surface is a machined sealing surface. The main flow channel 17 extends outward from the interior of the valve body 1 and penetrates the machined sealing surface (vertically downward as shown in the figure). A bottom flange 3 is provided at the opening of the main flow channel 17. The bottom flange 3 has a solid plugging cover structure. The valve body 1 and the bottom flange 3 are nested together and fixed by side bolts and nuts. A toothed gasket 7 is provided at the connection between the valve body 1 and the bottom flange 3. The toothed gasket 7 improves the sealing performance of the bottom of the valve body.

[0019] A valve stem 5 is provided inside the valve cover 2, and a valve core 4 is provided inside the valve body 1. At the connection between the valve body 1 and the valve cover 2, the head of the valve stem 5 is inserted into the tail end of the valve core 4. An adapted guide sleeve 6 is installed at the tail end of the valve core 4, and its head extends into the main flow channel 17 of the valve body 1. The guide sleeve 6 is fixedly installed inside the valve cover 2;

[0020] In the valve cover 2, a packing structure is arranged around the valve stem 5. The packing structure includes a packing seat 8, a packing spring 9, a packing 10, and a packing gland 11. The packing is a "V"-shaped packing. The gap formed between the valve stem 5 and the valve cover 2 first narrows and then widens from top to bottom. The packing seat 8 is installed at the gap change location. The packing spring 9 and the packing 10 are arranged in sequence above the packing seat 8. The packing spring and the V-shaped packing enhance the sealing performance of the valve. The packing gland 11 is press-fitted onto the packing 10. A packing pressure plate 12 is provided on the packing gland 11. The packing pressure plate 12 fixes the packing gland 11 with bolts and nuts.

[0021] A toothed gasket 7 is provided at the connection between the valve body 1 and the valve cover 2 to enhance the sealing performance.

Claims

1. A single-seat regulating valve comprising a valve body, a valve cover inserted into the top of the valve body, a first flow channel, a main flow channel, and a second flow channel provided inside the valve body, which are connected and communicated, characterized in that: The bottom of the valve body is concave, and its concave surface is a machined sealing surface. The main channel extends outward from the inside of the valve body and passes through the machined sealing surface. A bottom flange is provided at the opening of the main channel. The bottom flange is a solid plugging cover structure. The valve body and the bottom flange are nested with each other and fixed by side bolts and nuts. A toothed pad is provided at the connection between the valve body and the bottom flange.

2. The single-seat regulating valve according to claim 1, characterized in that: In the valve cover, a valve stem is provided inside the valve cover, and a packing structure is provided around the valve stem. The packing structure includes a packing seat, a packing spring, a packing, and a packing gland. The packing is a "V"-shaped packing. The gap formed between the valve stem and the valve cover first narrows and then widens from top to bottom. The packing seat is installed at the gap change location. The packing spring and packing are arranged in sequence above the packing seat. The packing gland is pressed onto the packing. A packing pressure plate is provided on the packing gland, and the packing pressure plate fixes the packing gland by bolts and nuts.

3. A single-seat regulating valve according to claim 1 or 2, characterized in that: A valve stem is provided inside the valve cover, and a valve core is provided inside the valve body. At the connection between the valve body and the valve cover, the rod head of the valve stem is inserted into the tail end of the valve core. An adaptive guide sleeve is installed at the tail end of the valve core, and its head extends into the main flow channel of the valve body. The guide sleeve is fixedly installed inside the valve cover.

4. The single-seat regulating valve according to claim 3, characterized in that: A toothed pad is provided at the connection between the valve body and the valve cover.

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