Two-piece cast ball valve

Abstract

The utility model discloses a cast two piece formula ball valve, including the valve body and the valve cover through the valve body sealed connection, the valve body and valve cover all install the valve seat, set up the valve ball between two valve seats, the top of valve ball is provided with arc valve stem groove and pressure relief hole, the bottom end of valve stem is placed in valve stem groove, and valve stem is sealedly connected with valve body, and the filler is equipped between valve stem and valve body, and the top of filler is equipped with pressure jacket, disc spring, lock nut in proper order, and pressure jacket, disc spring, lock nut are in proper order and are installed on valve stem, and handle positioning surface is opened to the upper portion both sides of valve stem symmetrically, and handle fixed screw hole is opened to the top surface of valve stem. The utility model discloses simple structure, clever design, reasonable layout, through the sealing structure of valve ball and valve seat, and multiple sealing measures are set up at the valve body connecting place and between valve stem and valve body, can effectively improve the sealing performance, reduce the risk of medium leakage, is applicable to various strict sealing requirement working scene.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a cast two-piece ball valve. Background Technology

[0002] Ball valves, as a common type of valve, are widely used in industrial production and daily life. They achieve the cutoff and flow of media through the rotation of a ball, and have advantages such as simple structure, convenient operation, and good sealing performance. Among them, two-piece ball valves, due to their structure consisting of two main parts, have unique advantages in terms of ease of maintenance and parts replacement, and are widely used in many fields such as chemical, petroleum, natural gas, water treatment, and food processing.

[0003] However, existing two-piece ball valves still exhibit some problems in practical use. For example, in some traditional designs, the sealing structure between the ball and the valve seat is not stable enough under complex operating conditions, easily leading to media leakage and affecting the normal operation of the system. Furthermore, the connection and sealing design between the valve stem and the valve body are prone to wear under frequent operation, resulting in poor stem rotation or even seal failure. In addition, the assembly and disassembly of some two-piece ball valves are cumbersome, requiring significant time and manpower, which is detrimental to improving work efficiency. Utility Model Content

[0004] To solve the above problems, this utility model provides a cast two-piece ball valve.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a cast two-piece ball valve, including a valve body and a valve cover connected by a valve body seal, valve seats are installed in both the valve body and the valve cover, a valve ball is set between the two valve seats, an arc-shaped valve stem groove and a pressure relief hole are opened on the top of the valve ball, the bottom end of the valve stem is placed in the valve stem groove, the valve stem is sealed to the valve body, a packing is provided between the valve stem and the valve body, a pressure sleeve, a disc spring and a locking nut are sequentially provided on the top of the packing, the pressure sleeve, the disc spring and the locking nut are sequentially fitted on the valve stem, a handle positioning surface is symmetrically opened on both sides of the upper part of the valve stem, and a handle fixing threaded hole is opened on the top surface of the valve stem.

[0006] Furthermore, the valve body and valve cover are fixedly connected by bolts and nuts.

[0007] Furthermore, the valve stem has a stepped cylindrical structure.

[0008] Furthermore, the lower shoulder surface of the valve stem is sealed to the valve body via a valve stem sealing gasket.

[0009] Furthermore, the lock nut is threadedly connected to the valve stem.

[0010] Furthermore, the inner cavity of the valve ball is connected to the pressure relief hole and the valve stem groove.

[0011] Furthermore, the valve ball and valve stem are made of 316L stainless steel.

[0012] This utility model features a simple structure, ingenious design, and reasonable layout. Through the sealing structure between the valve ball and valve seat, and multiple sealing measures at the valve body connection and between the valve stem and valve body, it effectively improves sealing performance and reduces the risk of media leakage. It is suitable for various working scenarios with stringent sealing requirements. The use of high-strength materials in the valve ball and valve stem significantly reduces friction and wear between components, improving durability and service life, and lowering maintenance and replacement costs. The positioning structure between the valve body and valve cover, along with the standardized connection method, makes assembly and disassembly of the valve ball more convenient and faster, improving work efficiency and facilitating equipment installation, commissioning, and daily maintenance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] The components are: 1. Valve body; 2. Valve cover; 3. Valve seat; 4. Valve ball; 5. Valve stem; 6. Valve body seal; 7. Packing; 8. Disc spring; 9. Locking nut; 10. Valve stem gasket; 11. Pressure sleeve; 12. Pressure relief hole. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 The technical solution of this utility model has been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] A cast two-piece ball valve includes a valve body 1 and a valve cover 2 connected by a valve body seal 6. The valve body 1 and valve cover 2 are fixedly connected by bolts and nuts. A valve seat 3 is installed inside both the valve body 1 and the valve cover 2. A valve ball 4 is placed between the two valve seats 3. The top of the valve ball 4 has an arc-shaped valve stem groove and a pressure relief hole 12. The inner cavity of the valve ball 4 communicates with the pressure relief hole 12 and the valve stem groove. The valve stem 5 has a stepped cylindrical structure. The valve ball 4 and valve stem 5 are made of 316L stainless steel. The bottom end of the valve stem 5... The valve stem 5 is placed in the valve stem groove. The lower shoulder surface of the valve stem 5 is sealed to the valve body 1 by the valve stem sealing gasket 10. A packing 7 is provided between the valve stem 5 and the valve body 1. A pressure sleeve 11, a disc spring 8, and a locking nut 9 are sequentially provided on the top of the packing 7. The pressure sleeve 11, the disc spring 8, and the locking nut 9 are sequentially fitted onto the valve stem 5. The locking nut 9 is threadedly connected to the valve stem 5. Handle positioning surfaces are symmetrically opened on both sides of the upper part of the valve stem 5. A handle fixing threaded hole is opened on the top surface of the valve stem 5.

[0017] First, install the valve seat 3 into the grooves on the inner side of the valve body 1 and the valve cover 2 respectively. Then, install the valve stem seal 10 from top to bottom along the valve stem 5 onto the upper end face of the lower shoulder of the valve stem 5. The valve stem 5 is then inserted into the inner cavity of the valve body 1 from bottom to top. After adjusting the correct direction of the valve stem 5, align the valve stem groove at the upper end of the valve ball 4 with the protrusion at the lower end of the valve stem 5. Install the valve ball 4 into the valve body 1. Then, install the valve body seal 6 into the groove at the end face of the valve body 1. After aligning the holes of the valve cover 2 and the valve body 1, connect them together by tightening bolts and nuts to ensure that the valve body seal 6 is compressed to form a good seal and prevent media leakage.

[0018] Place the packing 7 and pressure sleeve 11 onto the valve stem 5 from bottom to top, and insert them into the sealing groove at the upper end of the valve body 1. Install the disc spring 8 on the pressure sleeve 11 in a double-overlapping manner. Tighten the lock nut 9 to the valve stem 5 to the specified torque to complete the overall valve assembly. Subsequently, according to the opening and closing methods required by different actual working conditions, corresponding actuators can be added to the existing valve body 1 and valve stem 5 to drive the valve stem 5 to rotate and achieve the opening and closing function.

[0019] The embodiments described above are merely preferred embodiments of this utility model, and not all feasible embodiments of this utility model. For those skilled in the art, any obvious modifications made without departing from the principles and spirit of this utility model should be considered to be included within the scope of protection of the claims of this utility model. Although this utility model has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of this utility model. In particular, as long as there is no technical conflict, the features in the embodiments disclosed in this utility model can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, this utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cast two-piece ball valve, characterized in that, The valve body (1) and valve cover (2) are connected by a valve body seal (6). A valve seat (3) is installed in both the valve body (1) and the valve cover (2). A valve ball (4) is set between the two valve seats (3). An arc-shaped valve stem groove and a pressure relief hole (12) are opened on the top of the valve ball (4). The bottom end of the valve stem (5) is placed in the valve stem groove. The valve stem (5) is sealed to the valve body (1). A packing (7) is provided between the valve stem (5) and the valve body (1). A pressure sleeve (11), a disc spring (8), and a locking nut (9) are sequentially provided on the top of the packing (7). The pressure sleeve (11), the disc spring (8), and the locking nut (9) are sequentially fitted onto the valve stem (5). A handle positioning surface is symmetrically opened on both sides of the upper part of the valve stem (5). A handle fixing thread hole is opened on the top surface of the valve stem (5).

2. The cast two-piece ball valve according to claim 1, characterized in that, The valve body (1) and valve cover (2) are fixedly connected by bolts and nuts.

3. The cast two-piece ball valve according to claim 1, characterized in that, The valve stem (5) is a stepped cylindrical structure.

4. The cast two-piece ball valve according to claim 1, characterized in that, The lower shoulder surface of the valve stem (5) is sealed to the valve body (1) by a valve stem sealing gasket (10).

5. The cast two-piece ball valve according to claim 1, characterized in that, The locking nut (9) is threadedly connected to the valve stem (5).

6. The cast two-piece ball valve according to claim 1, characterized in that, The inner cavity of the valve ball (4) is connected to the pressure relief hole (12) and the valve stem groove.

7. The cast two-piece ball valve according to claim 1, characterized in that, The valve ball (4) and valve stem (5) are made of 316L.

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