Large-caliber cast steel two-piece type fixed ball valve

Abstract

The utility model discloses a large-caliber cast steel two-piece type fixed ball valve, which comprises a cast steel valve body, a cast steel valve cover, a ball body and a valve rod, wherein the ball body is positioned in the valve body and is provided with a through hole; the cast steel valve body and the cast steel valve cover are connected and fixed through a first bolt and a first nut; the upper portion of the ball body is connected with the valve rod through a third bearing, and the lower portion of the ball body is connected with a supporting shaft through a second bearing. The cast steel valve body is fixedly connected with the supporting shaft through a first screw. And the valve rod is connected with the gear box through a flat key. The fixed ball valve provided by the utility model has the advantages of stable sealing performance and long service life, is suitable for high-pressure and large-diameter occasions, and meets the requirements of the market on large-channel-diameter valves.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of valve, especially a large-diameter cast steel two-piece fixed ball valve. BACKGROUND

[0002] Cast steel ball valve appeared in the 1950s, with the rapid development of science and technology, production process and product structure are constantly improved, in the short decades, has rapidly developed into a major valve. At the same time, compared with forged steel ball valve, cast steel ball valve has the advantages of low cost, small machining allowance, short machining time and so on. At the same time, with the continuous growth of economic volume, industry, agriculture, transportation industry and people's clothing, food, housing and other aspects of the demand for oil, chemical, fine chemical, natural gas is increasing. The equipment and pipeline of the exploitation and refining production of petrochemical and natural gas industry are constantly increasing to match the rapid increase of production capacity, which requires large channel aperture, high life, high performance and low cost valve to meet the market demand.

[0003] Therefore, based on the advantages of cast steel ball valve and the increasing demand for large channel aperture valve in the market, our company has accumulated a large amount of ball valve design, production, assembly and testing experience after 20 years of continuous development, and independently developed a large-diameter cast steel two-piece fixed ball valve to fill the technical gap of large channel aperture ball valve. CONTENT OF THE UTILITY MODEL

[0004] In order to meet the market demand for large channel aperture valve, the utility model provides a cast steel two-piece fixed ball valve with stable sealing performance, long service life and applicability to high pressure and large aperture occasions.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0006] A large-diameter cast steel two-piece fixed ball valve, comprising: a cast steel valve body, a cast steel valve cover and a ball body with a through hole in the valve body, a valve stem;

[0007] The cast steel valve body and the cast steel valve cover are connected and fixed by a No. 1 bolt and a No. 1 nut;

[0008] The upper part of the ball body is connected with the valve stem through a No. 3 bearing, and the lower part of the ball body is connected with a support shaft through a No. 2 bearing;

[0009] The cast steel valve body and the support shaft are fixedly connected through a No. 1 screw;

[0010] The valve stem is connected with a gear box through a square key.

[0011] Preferably, graphite gaskets and O-rings are arranged between the cast steel valve body and the cast steel valve cover and the support shaft.

[0012] Preferably, the gear box and the cast steel valve body are sequentially provided with a top flange and a packing box.

[0013] The top flange is fixed on the gear box through No.

[0014] The top flange and the packing box are connected through No.

[0015] The packing box and the cast steel valve body are connected through No.

[0016] Preferably, the top flange and the gear box are provided with a No.

[0017] The top flange and the packing box are provided with a No.

[0018] The lower end of the packing box and the cast steel valve body are provided with a No.

[0019] Preferably, the ball and the cast steel valve body are provided with an anti-static spring.

[0020] The valve rod and the packing box are provided with an anti-static spring and an anti-static ball.

[0021] Preferably, the packing box and the top flange and the cast steel valve body are provided with a graphite gasket.

[0022] Preferably, the lower end of the packing box is connected with the ball through a No.

[0023] Preferably, the cast steel valve body and the ball are provided with a metal valve seat.

[0024] The metal valve seat is provided with a soft valve seat.

[0025] The soft valve seat is in contact with the ball.

[0026] Preferably, the metal valve seat and the cast steel valve body are provided with a valve seat spring.

[0027] Preferably, the cast steel valve body and the metal valve seat are sealed through an O-shaped sealing ring and a carbon fiber woven packing.

[0028] The utility model has the advantages of:

[0029] (1) The utility model provides a large -diameter cast steel two -piece fixed ball valve, including valve body and valve cover, the ball body with the hole is arranged in the valve body, the ball body top is connected with the valve stem through the bearing, the ball body below is connected with the support shaft through the rolling bearing, the cast steel valve body is fixedly connected with the support shaft through screw, the ball body is fixed through the support shaft, the ball body does not deviate from the axis of the support shaft when rotating, the ball body and the support shaft are connected through the sliding bearing, the force generated on the ball body by the pressure before the valve is all transmitted to the rolling bearing, reduces the friction, eliminates the excessive torque caused by the huge sealing load formed by the import pressure to push the ball body and the valve seat, the valve torque is small, makes the valve seat deformation small. The bearing and gasket are used at the valve rod and support shaft connection place, reduce the friction torque of the support shaft, the valve rod can be stable and flexible during long -term operation, improve the service life of the valve.

[0030] (2) The utility model proposes a kind of large -diameter cast steel two -piece fixed ball valve, our company is independently developed by long time to a large number of ball valve design, production, assembly, experience accumulation of testing, it is applicable to 30 and 32 of big aperture ball valve, the fixed ball valve, sealing performance is stable, service life is long, it is applicable to high pressure, big aperture occasion, fill the technical blank of big channel aperture ball valve, it is of great significance to market and our company development. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the structure schematic diagram of the utility model a kind of large -diameter cast steel two -piece fixed ball valve;

[0032] The mark of each component in the drawing is as follows:

[0033] 1, cast steel valve body;2, cast steel valve cover;3, ball body;4, valve rod;5, support shaft;6, stuffing box;7, top flange;8, metal valve seat;9, soft valve seat;10, lug;11, No. 1 bolt;12, No. 1 nut;13, No. 1 screw;14, No. 2 screw;15, No. 3 screw;16, No. 1 O-ring;17, No. 2 O-ring;18, No. 3 O-ring;19, No. 4 O-ring;20, No. 5 O-ring;21, No. 6 O-ring;22, carbon fiber woven packing;23, No. 1 graphite gasket;24, No. 2 graphite gasket;25, No. 3 graphite gasket;26, No. 4 graphite gasket;27, No. 1 gasket;28, No. 2 gasket;29, No. 1 bearing;30, No. 2 bearing;31, No. 3 bearing;32, square key;33, oil injection valve one;34, oil injection valve two;35, oil injection valve three;36, exhaust valve;37, blowdown cock;38, No. 1 pin;39, No. 2 pin;40, No. 2 bolt;41, valve seat spring;42, anti-static spring one;43, anti-static spring two;44, anti-static ball;45, gear box;46, No. 3 bolt;47, No. 3 nut;48, No. 3 pin. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0035] Example:

[0036] This embodiment describes the structure of a large-diameter cast steel two-piece fixed ball valve.

[0037] like Figure 1 As shown, a large-diameter cast steel two-piece fixed ball valve includes: a cast steel valve body 1, a cast steel valve cover 2, and a ball 3 with a through hole located inside the valve body 1, and a valve stem 4. The cast steel valve body 1 and the cast steel valve cover 2 are fixedly connected by a No. 1 bolt 11 and a No. 1 nut 12, making the product easy to install, disassemble, and interchange. The upper part of the ball 3 is connected to the valve stem 4 through a bearing 31, and the lower part of the ball 3 is connected to a support shaft 5 through a second bearing 30. The cast steel valve body 1 and the support shaft 5 are fixedly connected by a No. 1 screw 13.

[0038] In this embodiment, the bearing is a sliding bearing. By using a support shaft to fix the ball, the ball does not deviate from the axis of the support shaft when rotating. The ball and the support shaft are connected by a sliding bearing. The force generated by the pressure before the valve on the ball is all transferred to the bearing, which reduces friction and eliminates the excessive torque caused by the huge sealing load formed by the inlet pressure pushing the ball and the valve seat.

[0039] The valve stem 4 is connected to the gearbox 45 via a key 32, and the torque conversion of the gearbox allows the valve to be easily operated by a single person.

[0040] In this embodiment, the valve stem has a stepped structure design, which, with the positioning of the stuffing box, ensures that the product meets the safety design requirements for preventing blowout.

[0041] Furthermore, an antistatic spring 42 is provided between the ball 3 and the valve body 4, and an antistatic spring 43 and an antistatic ball 44 are provided between the valve stem 4 and the stuffing box 6. By providing antistatic springs and antistatic balls, static electricity can be prevented from igniting flammable media, ensuring overall safe operation under special working conditions.

[0042] In order to improve the sealing of the valve, a graphite gasket 23 is arranged at the joint between the side wall of the cast steel valve body 1 and the cast steel valve cover 2, and a graphite gasket 26 is arranged at the joint between the support shaft 5 and the cast steel valve body 1. An O-ring 21 is arranged at the joint between the side wall of the cast steel valve body 1 and the support shaft 5, and an O-ring 16 is arranged at the joint between the side wall of the cast steel valve body 1 and the valve cover 2. A gasket 28 is also arranged at the joint between the support shaft 5 and the ball 3.

[0043] Further, a top flange 7 and a stuffing box 6 are arranged between the gear box 45 and the cast steel valve body 1.

[0044] The top flange 7 is fixed to the gear box 45 by a third bolt 46 and a third nut 47.

[0045] The top flange 7 is connected to the stuffing box 6 by a third screw 15.

[0046] The stuffing box 6 is connected to the cast steel valve body 1 by a second screw 14.

[0047] Further, a third pin 48 is arranged between the top flange 7 and the gear box 45, a second pin 39 is arranged between the top flange 7 and the upper end of the stuffing box 6, and a first pin 38 is arranged between the lower end of the stuffing box 6 and the cast steel valve body 1. By arranging the pins, the positioning accuracy of the connection between the components can be improved.

[0048] Further, a second graphite gasket 24 is arranged at the joint between the stuffing box 6 and the cast steel valve body 1, and a third graphite gasket 25 is arranged at the joint between the stuffing box 6 and the top flange 7. A fourth O-ring 19 is arranged at the joint between the side wall of the stuffing box 6 and the cast steel valve body 1, and a fifth O-ring 20 is arranged at the joint between the side wall of the stuffing box 6 and the valve stem 1. A gasket 27 is arranged at the joint between the valve stem 4 and the stuffing box 6.

[0049] Further, the lower end of the stuffing box 6 is connected to the ball 3 by a first bearing 29.

[0050] By using bearings and gaskets at the valve stem and the support shaft, the friction torque between the valve stem and the support shaft can be reduced, the valve stem can operate smoothly and flexibly for a long time, the pure torque operation can be achieved, and the service life of the valve can be improved.

[0051] Further, the cast steel valve body 1 and the ball 3 are provided with a metal valve seat 8, and the metal valve seat 8 is provided with a soft valve seat 9, and the soft valve seat 9 is in surface contact with the ball 3. A valve seat spring compensation structure is adopted, the initial pre-tightening sealing specific pressure is provided by the spring, the soft valve seat is arranged at the ball valve and the metal valve seat; when a fire occurs, the soft valve seat fails, the metal surfaces of the ball valve and the metal valve seat are in contact, the sealing effect is achieved, and leakage of the medium is avoided.

[0052] Further, the metal valve seat 8 and the cast steel valve body 1 are further provided with a valve seat spring 41.

[0053] Further, the cast steel valve body 1 and the metal valve seat 8 are sealed by a No. 2 O-ring 17, a No. 3 O-ring 18 and a carbon fiber woven packing 22. When a fire occurs, the O-ring seal fails, the woven packing seals, and leakage of the medium is avoided.

[0054] The valve cavity adopts an automatic pressure relief design. When the liquid medium remaining in the valve cavity vaporizes due to temperature rise, causing the pressure in the cavity to abnormally rise, the medium in the cavity can automatically relieve pressure by relying on its own force to push the metal valve seat 8, thereby ensuring the safety of the valve and the production pipeline.

[0055] An oil injection valve one 33, an oil injection valve two 34 and an oil injection valve three 35 are arranged at the valve stem 4 and the cast steel valve body 1, which can temporarily seal in an emergency. The cast steel valve body 1 is further provided with an exhaust valve 36. The exhaust valve adopts a special thread and has good sealing performance.

[0056] The cast steel valve body 1 is provided with a blowdown cock 37.

[0057] The cast steel valve body 1 is provided with a lug 10 fixed by a No. 2 bolt.

[0058] In this embodiment, since the installation and working principle of the ball valve belong to the skilled person in the art, only the structure of the large-diameter ball valve developed and designed in this embodiment is introduced, and no more is described.

[0059] In this embodiment, the ball is fixed by a support shaft, the ball and the support shaft are connected by a sliding bearing, the force generated by the pressure before the valve on the ball is completely transmitted to the bearing, the friction is reduced, and the excessive torque caused by the huge sealing load formed by the inlet pressure pushing the ball and the valve seat is eliminated. The valve stem with a stepped gradually changing diameter is positioned and acted by the packing box, the top flange and the gear box, so that the product completely meets the safety design requirements of the anti-blowing of the valve stem.

[0060] The large-diameter cast steel two-piece fixed ball valve is independently developed by the company after 20 years of continuous development and accumulation of a large amount of ball valve design, production, assembly and testing experience, especially suitable for 30" and 32" large aperture, so that the company's ball valve business has been expanded, increasing the company's brand awareness and brand value, while the design of the large-diameter ball valve fills the technical gap of large-diameter ball valves on the market, and the design and development of the ball valve are of great significance to the market and the company. The fixed ball valve has stable sealing performance, long service life and is suitable for high-pressure and large-diameter occasions.

[0061] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process conversion using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A large-diameter cast steel two-piece fixed ball valve, characterized in that, include: Cast steel valve body (1), cast steel valve cover (2), and a ball (3) with a through hole located inside the cast steel valve body (1), and valve stem (4); The cast steel valve body (1) and the cast steel valve cover (2) are connected and fixed by bolt No. 1 (11) and nut No. 1 (12); The ball (3) is connected to the valve stem (4) above by a bearing (31) No. 3, and the ball (3) is connected to the support shaft (5) below by a bearing (30) No. 2; The cast steel valve body (1) and the support shaft (5) are fixedly connected by a No. 1 screw (13); The valve stem (4) is connected to the gearbox (45) via a square key (32).

2. The large-diameter cast steel two-piece fixed ball valve according to claim 1, characterized in that: Graphite gaskets and O-rings are provided between the cast steel valve body (1), the cast steel valve cover (2), and the support shaft (5).

3. The large-diameter cast steel two-piece fixed ball valve according to claim 1, characterized in that: A top flange (7) and a stuffing box (6) are sequentially provided between the gearbox (45) and the cast steel valve body (1). The top flange (7) is fixed to the gearbox (45) by bolts No. 3 (46) and nuts No. 3 (47); The top flange (7) is connected to the stuffing box (6) by a No. 3 screw (15); The stuffing box (6) is connected to the cast steel valve body (1) by a No. 2 screw (14).

4. A large-diameter cast steel two-piece fixed ball valve according to claim 3, characterized in that: A No. 3 pin (48) is provided between the top flange (7) and the gearbox (45). A second pin (39) is provided between the top flange (7) and the upper end of the stuffing box (6). A pin (38) is provided between the lower end of the stuffing box (6) and the cast steel valve body (1).

5. A large-diameter cast steel two-piece fixed ball valve according to claim 3, characterized in that: An antistatic spring (42) is provided between the ball (3) and the valve stem (4). An antistatic spring 2 (43) and an antistatic ball (44) are provided between the valve stem (4) and the stuffing box (6).

6. A large-diameter cast steel two-piece fixed ball valve according to claim 3, characterized in that: A graphite gasket is provided between the stuffing box (6), the top flange (7), and the cast steel valve body (1).

7. A large-diameter cast steel two-piece fixed ball valve according to claim 3, characterized in that: The lower end of the stuffing box (6) is connected to the ball (3) via a bearing (29).

8. A large-diameter cast steel two-piece fixed ball valve according to claim 1, characterized in that: A metal valve seat (8) is provided between the cast steel valve body (1) and the ball (3). A soft valve seat (9) is provided on the metal valve seat (8). The soft valve seat (9) is in contact with the ball (3).

9. A large-diameter cast steel two-piece fixed ball valve according to claim 8, characterized in that: A valve seat spring (41) is also provided between the metal valve seat (8) and the cast steel valve body (1).

10. A large-diameter cast steel two-piece fixed ball valve according to claim 9, characterized in that: The cast steel valve body (1) and the metal valve seat (8) are sealed by an O-ring and carbon fiber braided packing (22).

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