CN100501210C - Wear-resistant hard-sealed metal ball valve - Google Patents

Abstract

The invention provides a wear-resistant hard sealing metallic ball valve. Wherein, a ball is provided in a valve body, the ball is connected with a main shaft and a fixed shaft; at the upper end of the valve body, a stuffing box is provided; the entrance end of the valve body is provided with an end cover assembly; a cylinder actuator is provided on the upper end of the valve body through a cylinder support; the main shaft is connected with the cylinder actuator; in the end cover of the end cover assembly, a base is provided; the circular recess of the base is provided with a compression spring, the upper end of which is provided with a pressure ring; in the cavity of the base, a valve seat is provided; the seal surface between the valve seat and the ball is a spherical seal surface; the eccentric section at the lower end of the main shaft is connected with the upper end of the ball in eccentric fitting way; all the main shaft, the fixed shaft and the valve seat employ double sealing; a plurality of flushing ports are provided on the valve body for flushing the ball, the valve seat, the main shaft and the fixed shaft. The valve is resistant to high temperature, high pressure, corrosion and abrasive, is of high air tightness and flexible movement, and is widely applicable for coal and chemical industry.

Description

Wear-resistant hard-sealed metal ball valve

technical field

The invention relates to a ball valve, in particular to a wear-resistant and hard-sealed metal ball valve used in the coal chemical industry.

Background technique

Ball valves are widely used in various fields such as petroleum, coal chemical industry, steel, metallurgy, and electric power. Compared with other valves used to control the on-off of pipeline media, ball valves have the advantages of small fluid resistance, convenient operation, rapid opening and closing, unrestricted flow direction, and compact structure. However, because the valve seat of ordinary ball valves is generally made of polymer synthetic materials such as rubber and polytetrafluoroethylene, the service temperature is lower than 200 ° C, and the wear resistance is very poor, which limits the scope of use of ball valves. It is also difficult for existing hard-sealed ball valves to meet the requirements of harsh working conditions in terms of corrosion resistance and erosion. The wear-resistant hard-sealed metal ball valve can greatly improve the overall performance of the ball valve.

Affected by the rising prices of international crude oil and natural gas, the domestic coal chemical industry has developed rapidly in recent years. Large-scale coal chemical plants have been invested and constructed throughout the country. Wear-resistant hard-sealed metal ball valves are used in coal chemical process plants to transport coal powder and It is an important equipment for vaporizing slag water, and its performance plays a key role in the operation of the whole device. Due to the high temperature and high pressure of the working condition, and the medium also contains ash and slag and other highly abrasive solid particles, the wear-resistant hard-sealed ball valve needs to have comprehensive properties such as high temperature resistance, high pressure resistance, corrosion resistance, and wear resistance. In addition, it also has the characteristics of good sealing performance of the valve seat and flexible movement.

Contents of the invention

The object of the present invention is to provide a wear-resistant metal hard-sealed ball valve with high temperature resistance, high pressure resistance, corrosion resistance, abrasion resistance, good sealing performance and flexible action.

The technical solution to achieve the purpose of the present invention: a wear-resistant hard-sealed metal ball valve, a ball is arranged in the valve body, the upper and lower ends of the valve body are respectively provided with a main shaft and a fixed shaft connected to the ball, and the upper end of the valve body is provided with a stuffing box. There is packing between the stuffing box and the main shaft, and the packing gland set on the upper end of the packing is connected to the valve body. The inlet end of the valve body is provided with an end cover assembly. The end cover of the end cover assembly is provided with a base. The groove is provided with a compression spring, the upper end of the compression spring is provided with a compression ring, and a valve seat is provided in the cavity of the base, and the sealing surface between the valve seat and the sphere is a spherical sealing surface.

A flushing port is provided on the valve body at a position corresponding to the ball, the main shaft, the fixed shaft and the valve seat.

The lower end of the main shaft of the ball valve is provided with an eccentric section, which is connected with the eccentric hole provided at the upper end of the sphere, and when the main shaft rotates, it drives the sphere to rotate.

The main shaft, the fixed shaft and the valve seat are connected by double seals.

The surface of the main shaft and fixed shaft of the ball valve is sprayed with ceramic material; the spherical sealing surface between the valve seat and the ball is sprayed with hard alloy.

Compared with the prior art, the present invention has the following advantages: (1) A soft-hard spherical sealing form is adopted between the sphere and the valve seat, a compression spring is arranged on the base of the end cap assembly, and the sealing surface between the sphere and the valve seat is a ball seal. Type sealing surface, under the action of spring pre-tightening force, a certain sealing specific pressure is generated to achieve sealing, which not only ensures that the valve seat will not be damaged due to high pressure, nor will it be damaged due to slight scratches on the valve seat. It causes damage to the seal and improves the sealing performance of the ball valve; the base of the end cover assembly is embedded inside the end cover, which not only ensures the long-term stable operation of the valve, but also reduces the cost of the valve and improves the economy. (2) The main shaft, fixed shaft and valve seat are all sealed with double channels to prevent solid particles from entering the above-mentioned sealing pair, effectively reducing wear and prolonging the service life. (3) The eccentric section at the lower end of the main shaft is eccentrically connected with the upper end of the sphere. When the double-acting cylinder drives the main shaft to rotate, the sphere will rotate accordingly, preventing damage to the main shaft and improving work efficiency. (4) There are multiple flushing ports designed on the valve body, which are used for flushing the ball, valve seat, main shaft and fixed shaft, so as to ensure flexible action and long-term operation of the valve. (5) The spherical surface of the valve seat and the ball is sprayed and hardened to improve the impact resistance and wear resistance of the valve; the ball valve switches frequently, and the valve stem is severely worn. After the surface of the main shaft and fixed shaft is sprayed with ceramic materials, the ball valve is improved. wear resistance and service life.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the front view of the sphere of the present invention;

Fig. 3 is a top view of a sphere of the present invention;

Fig. 4 is the main shaft front view of the present invention;

Fig. 5 is the main shaft bottom view of the present invention;

Figure 6 is a sectional view of the valve seat assembly of the present invention;

Fig. 7 is a cross-sectional view of the end cap assembly of the present invention.

In the figure: 1. valve body; 2. end cover assembly; 3. main shaft; 4. sphere; 5. actuator; 6. cylinder bracket; 7. packing gland; 8. stuffing box; .Fixed shaft sleeve; 11. Fixed shaft; 12. Graphite sealing ring; 13. Valve seat assembly; 14. Packing; 15. Gasket; 16. Gasket; 17. Gasket; 18. Bolt; 19. Bolt; 20. bolt; 21. key; 22. bolt; 23. long bolt; 24. bolt; 25. graphite sealing ring; 26. graphite sealing ring; 27. eccentric hole; 28. eccentric section; 29. V-shaped packing; 30 .Spring; 31. Pressure ring; 32. Valve seat; 33. Spherical sealing surface; 34. End cover; 35. Base; 36. Inlet; 37. Outlet; 38. Ball channel; 39, 40, 41, 42. Flush the mouth.

Detailed ways

The content of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1, 2 and 3, the left and right ends of the valve body 1 are respectively an outlet 36 and an inlet 37, and the upper and lower ends of the valve body 1 are provided with through holes for installing the main shaft 3 and the fixed shaft 11. A ball 4 is arranged in the cavity of the valve body 1, and a ball channel 38 located in the same axial direction as the inlet 36 and the outlet 37 is arranged in the axial direction of the ball 4. The radial upper end of the ball 4 is provided with an eccentric hole 27, and the radial lower end is provided with a center hole. A fixed shaft sleeve 10 is placed in the center hole of the sphere 4, and two graphite sealing rings 12 are placed in the fixed shaft sleeve 10. The fixed shaft 11 passes through the valve body 1 and is in sealing connection with the fixed shaft sleeve 10. The connection between the fixed shaft 11 and the valve body 1 Between them are fixedly connected by bolts 24 by means of sealing gasket 15 , and a vertical through hole is provided on the fixed shaft 11 , and the vertical through hole is connected with the flushing port 39 . The lower end of the main shaft 3 is provided with an eccentric section 28 that matches the eccentric hole 27 on the sphere 4. After adding two graphite seal rings 26 into the main shaft sleeve 9, it is placed on the top of the eccentric section 28 of the main shaft 3. After assembly, the main shaft 3 The eccentric section 28 of the sphere is inserted into the eccentric hole 27 on the sphere 4, so that when the main shaft 3 rotates, the sphere 4 is driven to rotate, the main shaft sleeve 9 is located between the main shaft 3 and the valve body 1, and the main shaft 3 and the main shaft sleeve 9 are connected by graphite The sealing ring 26 is sealed and connected, and the side wall of the main shaft sleeve 9 is provided with a stepped through hole, and the corresponding valve body 1 is also provided with a through hole, and the through hole is connected with the flushing port 42 . A stuffing box 8 is provided on the upper end of the valve body 1 and the spindle bushing 9 , and the valve body 1 and the stuffing box 8 are sealed and connected by means of a gasket 17 . Packing 14 is filled between the stuffing box 8 and the main shaft 3, and the upper end of the stuffing box 8 is provided with a stuffing gland 7, and the stuffing box 8 and the valve body 1 are connected by means of bolts 20, and the stuffing gland 7 is connected with the stuffing box 8 and the valve body 1 are connected by means of long bolts 23, and the packing 14 is compressed by the packing gland 7 through the long bolts 23. The surfaces of the main shaft 3 and the fixed shaft 11 are sprayed with ceramic materials. The side of the inlet 36 of the valve body 1 is tightly connected with the end cover assembly 2 by means of the gasket 16 and the bolt 18 .

As shown in 6 and 7, the base 35 is welded inside the end cover 34 of the end cover assembly 2, and an annular groove is provided on the inner side wall of the cavity of the base 35, and the compression spring 30 is placed in the annular groove. Both the side walls of the base 35 and the end cover 34 are provided with a coaxial oblique hole communicating with the annular groove of the base 35 , and the coaxial oblique hole is connected with the flushing port 41 . A pressure ring 31 is placed on the upper end of the compression spring 30, a V-shaped packing 29 is placed on the through hole of the side wall of the pressure ring 31, a valve seat 32 is arranged in the cavity of the base 35 and the upper end of the pressure ring 31, and a graphite sealing ring is also installed at the tail of the valve seat 32. 25. The valve seat 32 and the base 35 are sealed by means of a graphite seal ring 25, the pressure ring 31 and the valve seat 32 are sealed by means of a V-shaped packing 29, and the base 35 and the valve seat 32 are sealed by means of a graphite seal ring 25 sealed connections. An annular groove is provided on the outer wall of the upper end of the valve seat 32, and a coaxial oblique hole communicating with the annular groove of the valve seat 32 is formed on the side wall of the base 35 and the end cover 34, and the coaxial oblique hole is connected with the flushing port 40 . The sealing surface between the valve seat 32 and the sphere 4 is a spherical sealing surface 33, and the surface is sprayed with hard alloy.

The cylinder bracket 6 is arranged on the upper end of the valve body 1 , the double-acting cylinder actuator 5 is arranged on the upper end of the cylinder bracket 6 , and the double-acting cylinder actuator 5 is arranged on the upper end of the valve body 1 through the cylinder bracket 6 . The valve body 1 and the double-acting cylinder actuator 5 are connected and fixed to the cylinder bracket 6 through bolts 19 and 22, and the upper end of the main shaft 3 passing through the cylinder bracket 6 is connected to the double-acting cylinder actuator 5 through a double key 21.

Working process: During normal operation, the ball valve is installed in the middle of the system pipe, the medium flows in from the inlet 36, flows through the ball channel 38, and flows out of the valve from the outlet 37. When the system requires the valve to be closed, the valve is closed by controlling the movement of the piston at one end of the double-acting cylinder actuator 5 to drive the main shaft 3 and the sphere 4 to rotate. When the system requires the valve to be opened, the main shaft 3 and the sphere 4 are driven to reversely rotate by controlling the piston movement at the other end of the double-acting cylinder actuator 5 to realize the opening of the valve. Simultaneously, the valve flushing ports 39, 40, 41, 42 lead into cleaning media to clean the main shaft 3, the fixed shaft 11, the spheroid 4 and the valve seat 32, so as to ensure the flexible action of the valve.

Claims (9)

1. A wear-resistant hard-sealed metal ball valve. A ball is arranged in the valve body. The upper and lower ends of the valve body are respectively provided with a main shaft and a fixed shaft connected to the ball. The upper end of the valve body is provided with a stuffing box. There is packing between them, the packing gland at the upper end of the packing is connected with the valve body, the inlet end of the valve body is provided with an end cover assembly, the cylinder type actuator is set on the upper end of the valve body through the cylinder bracket, and the main shaft is connected with the cylinder type actuator. It is characterized in that: the end cover of the end cover assembly is provided with a base, the annular groove of the base is provided with a compression spring, the upper end of the compression spring is provided with a compression ring, and a valve seat is provided in the cavity of the base, and the gap between the valve seat and the ball is The sealing surface of the valve is a spherical sealing surface, and a flushing port is provided on the valve body at the position corresponding to the ball, the main shaft, the fixed shaft and the valve seat. 2. The wear-resistant hard-sealed metal ball valve as claimed in claim 1, characterized in that: both the end cover and the base are provided with a coaxial inclined hole communicating with the annular groove provided with the pressure spring on the base, and the coaxial inclined hole is The hole is connected to the flush port. 3. The wear-resistant hard-sealed metal ball valve as claimed in claim 1, characterized in that: both the end cover and the base are provided with a coaxial inclined hole communicating with the annular groove provided on the valve seat, and the coaxial inclined hole Connect to flush port. 4. The wear-resistant hard-sealed metal ball valve according to claim 1, characterized in that: the valve body and the spindle sleeve in the valve body are provided with coaxial horizontal holes, and the coaxial horizontal holes are connected to the flushing port. 5. The wear-resistant hard-sealed metal ball valve according to claim 1, characterized in that: the fixed shaft is provided with a vertical through hole, and the vertical through hole is connected with the flushing port. 6. The wear-resistant hard-sealed metal ball valve as claimed in claim 1, characterized in that: the lower end of the main shaft is provided with an eccentric section, which is connected with the eccentric hole provided at the upper end of the ball, and when the main shaft rotates, it drives the ball to rotate. 7. The wear-resistant hard-sealed metal ball valve according to claim 1, characterized in that: the main shaft, the fixed shaft and the valve seat are connected by double seals. 8. The wear-resistant hard-sealed metal ball valve as claimed in claim 1 or 7, characterized in that: the pressure ring is provided with V-shaped packing, the pressure ring and the valve seat are sealed and connected by means of V-shaped packing, and the base and the valve seat The connections are sealed by means of graphite sealing rings. 9. The wear-resistant hard-sealed metal ball valve according to claim 1, characterized in that: the surface of the main shaft and the fixed shaft are sprayed with ceramic materials; the spherical sealing surface between the valve seat and the ball is sprayed with hard alloy.

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