Large-diameter balanced y-shaped forged thermal insulation stop valve

Abstract

The utility model discloses a large -diameter balanced Y type forge heat -retention stop valve mainly by the following component installation constitutes: the valve body branch pipe is 45 degree bevel angle and is welded valve body main pipe, and the import and export of valve body branch pipe respectively welds import flange and export flange, and the upper port of valve body main pipe welds valve body upper flange, and the bottom mouth of valve body main pipe in valve body branch pipe welds valve seat, and the valve core is located in the valve body main pipe and is installed on the valve seat, and the lower valve rod bottom end inserts the valve core, and the balance seat is put into the valve body main pipe and makes the valve core insert the balance seat, and the balance seat bottom end forms the seal with the valve core, and the valve holder passes through the lower valve rod and is installed on the valve body upper flane, and the clearance of valve holder inner wall and lower valve rod forms the seal through the upper packing, and the upper valve rod is installed on the valve holder, and the upper valve rod bottom end is connected with lower valve rod top end, and the upper valve rod top end installs the impact hand wheel. The utility model adopts balanced structure, and the higher the pressure is, the better the sealing is, and the stability is good, and the reliability is good, and the valve opening and closing is easy, and the safety factor is high, and the service period is long, and the whole is beautiful.

Description

Technical Field

[0001] This utility model relates to valves, specifically to a large-diameter balanced Y-type forged insulated stop valve. Background Technology

[0002] Valves are essential equipment in the production pipelines of enterprises in the petroleum, chemical, fertilizer, nuclear power, pharmaceutical, and food industries. Y-type insulated gate valves are the main valves used to shut off the medium in case of external leakage. The performance of these valves—safety, stability, reliability, and sealing—directly affects the safety, output, and economic benefits of the entire production process. Especially under harsh operating conditions, higher requirements are placed on the sealing performance, safety factor, temperature and pressure resistance, corrosion resistance, and service life of Y-type insulated gate valves.

[0003] Currently, due to increased production capacity, the demand for large-diameter Y-type insulated gate valves has also increased. Domestically produced large-diameter Y-type insulated gate valves mainly encounter the following problems during production and use: 1. They are generally made of cast iron. Casting is prone to defects such as sand holes, air holes, cracks and loose structure in the shell. In addition, large-diameter Y-type insulated gate valves are 45° angled. During operation, due to the vibration of the pipeline medium flow rate, high temperature thermal expansion and pressure, medium leakage often occurs, resulting in an unsatisfactory sealing effect, which brings hidden dangers to production and affects normal production.

[0004] 2. The existing large-diameter Y-type insulated gate valve has a heavy valve core, which causes the center of gravity to be biased to one side after connecting with the lower valve stem, resulting in poor sealing effect. Moreover, due to the biased center of gravity, the friction coefficient between the lower valve stem and the packing seat on one side increases, making it difficult to open and close the valve, and the packing is easily damaged, causing external leakage.

[0005] 3. The existing large-diameter Y-type insulated gate valve requires the valve frame to store load force, which leads to two problems: first, the valve stem is not flexible and smooth in opening and closing; second, leakage problems are prone to occur between the valve body and the valve frame, which cannot guarantee the safety, stability and economic benefits of the production enterprise.

[0006] 4. Due to increased production capacity, the medium flow rate has accelerated. The materials of the valve seat and valve core of the existing large-diameter Y-type insulated gate valve cannot meet the requirements of the production process in terms of corrosion resistance and erosion resistance, resulting in a shortened service life. Summary of the Invention

[0007] The purpose of this utility model is to provide a large-diameter balanced Y-type forged insulated stop valve. This valve adopts a balanced structure, which provides better sealing under higher pressure, good stability, good reliability, easy opening and closing, high safety factor, long service life, and overall aesthetics.

[0008] The technical solution of this utility model is as follows: This large-diameter balanced Y-type forged insulated gate valve includes: an inlet flange, a valve body branch pipe, a valve seat, a valve core, a lower valve stem, a valve body main pipe, a valve body upper flange, a balance seat, a valve frame, an impact handwheel, an upper valve stem, and an outlet flange; the valve body is composed of a valve body main pipe welded at a 45° angle to the valve body branch pipe. Both the valve body branch pipe and the valve body main pipe are forged. The inlet and outlet flanges of the valve body branch pipe are welded respectively. The upper flange of the valve body is welded to the upper end of the valve body main pipe. The valve seat is welded to the bottom end of the valve body main pipe located inside the valve body branch pipe. The valve core is located inside the valve body main pipe and installed on the valve seat. The bottom end of the lower valve stem is inserted into the valve core and connected to the valve core through a gasket and a pressure cap. The balance seat is connected to the valve body main pipe. The upper end of the lower valve stem is inserted downwards into the main valve body, allowing the valve core to be inserted into the balance seat. The bottom end of the balance seat and the valve core are sealed by the lower packing, the lower packing gland, the connecting bolts, and the No. 4 lock nut. The top end of the balance seat is fitted to the main valve body through a metal spiral wound gasket. The valve frame passes through the lower valve stem and is installed on the upper flange of the valve body through the No. 1 connecting bolt and the No. 1 lock nut. The gap between the inner wall of the valve frame and the lower valve stem is sealed by the upper packing through the through pin, pressure plate, ball head bolt, and the No. 2 lock nut. The upper valve stem passes through the valve frame and is installed on the valve frame through the valve stem nut and the anti-reverse screw. The bottom end of the upper valve stem is connected to the top end of the lower valve stem through the retaining ring, the retaining sleeve, and the retaining ring. The top end of the upper valve stem is fitted with the impact handwheel through the gasket and the No. 3 lock nut.

[0009] Furthermore, insulation sleeves are wrapped around the valve body branch pipes and valve body main pipes.

[0010] Furthermore, the insulation jacket is equipped with a steam inlet connector, a steam outlet connector, and a drain connector.

[0011] The advantages of this utility model are: 1. This utility model replaces the original packing seat of the valve with a balance seat, solving the problem of the valve core's center of gravity being biased to one side; moreover, through the pressure of the balance seat's own cavity, it maintains the pressure balance inside and outside the valve core, so that there is no medium resistance when the valve opens and closes, easily solving the problem of valve core opening and closing, while dispersing the friction between the lower valve stem and the balance seat, thus improving the service life of the valve; 2. The valve stem switches flexibly and smoothly, and the valve frame has no load, completely solving the problem of easy leakage between the valve body and the valve frame, ensuring the safety, stability and economic benefits of the production enterprise; 3. This utility model changes the material of the valve seat and valve core to U3 steel and S32205, which have better corrosion resistance and erosion resistance, thus improving the service life of the valve; 4. The valve of this utility model adopts a balanced structure, which provides better sealing and performance at higher pressures, has a high safety factor, a long service life, and an overall aesthetically pleasing appearance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the original large-diameter Y-type insulated stop valve for high temperature and high pressure. Figure 2This is a schematic diagram of the structure of the large-diameter Y-type heat-insulating stop valve of this utility model; In the diagram: 1-Inlet flange; 2-Valve body branch pipe; 3-Valve seat; 4-Valve core; 5-Lower valve stem; 6-Gasket; 7-Pressure cap; 8-Steam inlet connector; 9-Insulation sleeve; 10-Valve body main pipe; 11-Valve body upper flange; 12-Metal spiral wound gasket; 13-Balance seat; 14-No. 1 connecting bolt; 15-No. 1 lock nut; 16-Upper packing; 17-Valve bracket; 18-Through pin; 19-Pressure plate; 20- 21-2-Ball head bolt; 22-Valve stem nut; 23-Anti-reverse screw; 24-Impact handwheel; 25-Gasket; 26-3-2-2-2-2-3-2-3-3-3-3-4 ... Detailed Implementation

[0013] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0014] like Figure 2 As shown, this large-diameter balanced Y-type forged insulated gate valve includes: an inlet flange 1, a valve body branch pipe 2, a valve seat 3, a valve core 4, a lower valve stem 5, a valve body main pipe 10, a valve body upper flange 11, a balance seat 13, a valve frame 17, an impact handwheel 24, an upper valve stem 30, and an outlet flange 35. The valve body is formed by welding the valve body main pipe 10 at a 45° angle to the valve body branch pipe 2. Both the valve body branch pipe 2 and the valve body main pipe 10 are forged. The inlet flange 1 and outlet flange 35 are welded to the inlet and outlet of the valve body branch pipe 2, respectively. The upper flange 11 is welded to the upper end of the valve body main pipe 10. The valve seat 3 is welded to the bottom end of the valve body main pipe 10 located inside the valve body branch pipe 2. The valve core 4 is located inside the valve body main pipe 10 and installed on the valve seat 3. The bottom end of the lower valve stem 5 is inserted into the valve core and connected to the valve core 4 through a gasket 6 and a pressure cap 7. The balance seat 13 is inserted downward into the valve body main pipe 10 through the upper end of the lower valve stem 5. The valve core 4 is inserted into the balance seat 13. The bottom end of the balance seat 13 and the valve core 4 are sealed by the lower packing 34, the lower packing gland 33, the connecting bolt 32, and the fourth locking nut 31. The top end of the balance seat 13 is engaged with the valve body main pipe 10 by the metal spiral wound gasket 12. The valve frame 17 passes through the lower valve stem 5 and is installed on the upper flange 11 of the valve body by the first connecting bolt 14 and the first locking nut 15. The gap between the inner wall of the valve frame 17 and the lower valve stem 5 is sealed by the through pin 18, the pressure plate 19, the ball head bolt 21, and the second locking nut 20, and the upper packing 16 is installed. The upper valve stem 30 passes through the valve frame and is installed on the valve frame 17 by the valve stem nut 22 and the anti-reverse screw 23. The bottom end of the upper valve stem 30 is connected to the top end of the lower valve stem 5 by the retaining ring 27, the retaining sleeve 28, and the retaining ring 29. The top end of the upper valve stem 30 is installed with the impact handwheel 24 by the gasket 25 and the third locking nut 26.

[0015] Furthermore, insulation sleeves 9 are wrapped around the valve body branch pipe 2 and the valve body main pipe 10.

[0016] Furthermore, the insulation jacket 9 is equipped with a steam inlet connector 8, a steam outlet connector 36, and a drain connector 37.

Claims

1. Large-diameter balanced Y-type forged insulated stop valve, characterized by: It includes: an inlet flange (1), a valve body branch pipe (2), a valve seat (3), a valve core (4), a lower valve stem (5), a valve body main pipe (10), a valve body upper flange (11), a balance seat (13), a valve frame (17), an impact handwheel (24), an upper valve stem (30), and an outlet flange (35); the valve body is composed of a valve body main pipe (10) welded at a 45° angle to the valve body branch pipe (2). Both the valve body branch pipe (2) and the valve body main pipe (10) are forged. The inlet and outlet of the valve body branch pipe (2) are welded with an inlet flange. The valve body is welded to the upper port of the valve body main pipe (10) and the outlet flange (35). The valve body upper flange (11) is welded to the upper port of the valve body main pipe (10) located in the valve body branch pipe (2). The valve seat (3) is welded to the bottom port of the valve body main pipe (10). The valve core (4) is located in the valve body main pipe (10) and installed on the valve seat (3). The bottom end of the lower valve stem (5) is inserted into the valve core and connected to the valve core (4) through the gasket (6) and the pressure cover (7). The balance seat (13) is inserted downward into the valve body main pipe (10) through the upper end of the lower valve stem (5) so that the valve core (4) is inserted. The balance seat (13) is sealed to the valve core (4) at its bottom end via the lower packing (34), the lower packing gland (33), the connecting bolt (32), and the fourth locking nut (31). The top end of the balance seat (13) is fitted to the valve body main pipe (10) via a metal spiral wound gasket (12). The valve frame (17) passes through the lower valve stem (5) and is mounted on the upper flange (11) of the valve body via the first connecting bolt (14) and the first locking nut (15). The gap between the inner wall of the valve frame (17) and the lower valve stem (5) is clear. The upper packing (16) is installed through the through pin (18), pressure plate (19), ball head bolt (21), and No. 2 lock nut (20) to form a seal. The upper valve stem (30) passes through the valve frame and is installed on the valve frame (17) through the valve stem nut (22) and the anti-reverse screw (23). The bottom end of the upper valve stem (30) is connected to the top end of the lower valve stem (5) through the retaining ring (27), the retaining sleeve (28), and the retaining ring (29). The top end of the upper valve stem (30) is installed with the impact handwheel (24) through the gasket (25) and No. 3 lock nut (26).

2. The large-diameter balanced Y-type forged insulated stop valve according to claim 1, characterized in that: An insulation sleeve (9) is wrapped around the valve body branch pipe (2) and the valve body main pipe (10).

3. The large-diameter balanced Y-type forged insulated stop valve according to claim 2, characterized in that: The insulation jacket (9) is equipped with a steam inlet connector (8), a steam outlet connector (36), and a drain connector (37).

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