Low-torque high-performance ball valve

Abstract

The low-torque high-performance ball valve comprises a left valve body, a middle valve body and a right valve body, the left valve body, the middle valve body and the right valve body are assembled to form a valve cavity, a left valve seat, a valve ball and a right valve seat are arranged in the valve cavity, a valve rod mounting through hole is formed in the upper end of the middle valve body, a valve rod is arranged in the valve rod mounting through hole, and a valve rod is arranged in the valve rod mounting through hole. The lower end of the valve rod extends into the valve cavity to be connected with the upper end of the valve ball, the upper end of the valve rod is exposed out of the valve rod installation through hole, and a lubricating system is arranged between the valve rod and the middle valve body and comprises a valve rod axial oil hole, a valve rod radial through oil hole, a valve rod circumferential oil groove and a valve rod axial oil guide groove which are formed in the valve rod. An oil cup installation groove is formed in the upper end of the valve rod axial oil hole, an oil cup is arranged at the upper end of the valve rod, and the oil cup, the valve rod axial oil hole, the valve rod radial through oil hole, the valve rod axial oil guide groove and the valve rod circumferential oil groove are communicated. The technical scheme is reasonable in structural design, good in sealing performance, long in service life and good in practicability.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, specifically to a low-torque, high-performance ball valve. Background Technology

[0002] Small-diameter high-pressure ball valves are widely used in the petroleum and chemical industries, and their performance and reliability are crucial to the safety and production efficiency of pipelines and equipment. However, existing ball valve structures have shortcomings: unreasonable structural design often leads to problems such as stem dynamic seal leakage, static seal leakage between the central body and the left and right bodies, and increased torque during valve opening and closing after a period of use. These issues severely impact product reliability and performance, resulting in short service life and poor practicality. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a low-torque, high-performance ball valve with reasonable structural design, good sealing performance, long service life and good practicality.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a low-torque, high-performance ball valve, comprising a left valve body, a middle valve body, and a right valve body. The left, middle, and right valve bodies are assembled to form a valve cavity. A left valve seat, a valve ball, and a right valve seat are disposed within the valve cavity. A valve stem mounting through hole is provided at the upper end of the middle valve body. A valve stem is disposed within the valve stem mounting through hole. The lower end of the valve stem extends into the valve cavity and connects to the upper end of the valve ball. The upper end of the valve stem protrudes from the valve stem mounting through hole. A lubrication system is provided between the valve stem and the middle valve body. The lubrication system includes an axial oil hole, a radial through-hole, a circumferential oil groove, and a axial guide oil groove, all located within the valve stem. An oil cup mounting groove is located at the upper end of the axial oil hole. An oil cup is located at the upper end of the valve stem, and its lower end is mounted within the oil cup mounting groove. The oil cup communicates with the axial oil hole. The lower end of the axial oil hole communicates with the radial through-hole. The circumferential oil groove is located at the outer port of the radial through-hole. The upper end of the axial guide oil groove communicates with the circumferential oil groove.

[0005] The present invention is further configured as follows: a first bearing mounting groove is provided at the lower end of the valve stem mounting through hole in the valve body; a cap mounting groove, a packing groove, and a second bearing mounting groove are provided sequentially from top to bottom on the inner wall of the valve stem mounting through hole; a first bearing assembly is provided in the first bearing mounting groove; a cap is provided in the cap mounting groove; a packing layer is provided in the packing groove; the lower end face of the cap presses against the upper end face of the packing layer; a second bearing is provided in the second bearing mounting groove; a cap valve stem through hole is provided at the position of the cap aligned with the valve stem mounting through hole; a third bearing mounting groove is provided at the lower end of the inner wall of the cap valve stem through hole; a third bearing is provided in the third bearing mounting groove; and the inner wall of the third bearing is partially connected to the valve stem shaft guide oil groove and the valve stem circumferential oil groove.

[0006] The present invention is further configured such that: an inner cavity is provided inside the oil cup; a lubricating oil inlet is provided on the upper end surface of the oil cup, which communicates with the inner cavity of the oil cup; a lubricating oil outlet is provided on the lower end surface of the oil cup, which communicates with the inner cavity of the oil cup; a return spring and a ball are provided inside the inner cavity of the oil cup; and the ball presses against the lower port of the lubricating oil inlet under the elastic force of the return spring.

[0007] The present invention is further configured such that: an internal thread is provided on the inner wall surface of the oil cup mounting groove, and an external thread connection part is provided at the lower end of the oil cup, and the oil cup is connected and fixed to the internal thread in the oil cup mounting groove through the external thread connection part.

[0008] The present invention is further configured such that: an anti-blowout protrusion is integrally provided at the lower end of the valve stem, and the upper end face of the anti-blowout protrusion is connected to the lower end face of the first bearing assembly.

[0009] The present invention is further configured such that: a ring groove is provided at a local position of the valve stem, and a valve stem O-ring is provided in the ring groove, and the valve stem forms a seal with the inner wall surface of the valve stem mounting through hole through the valve stem O-ring.

[0010] The present invention is further configured such that: from the inside to the outside, the left valve body, the middle valve body and the right valve body are provided with a valve body O-ring, a metal spiral wound gasket and an all-metal sealing structure.

[0011] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model has a reasonable structural design. A lubrication system is provided at the top of the valve stem. The oil cup, the axial oil hole of the valve stem, the radial through oil hole of the valve stem, the circumferential oil groove of the valve stem, and the axial guide oil groove of the valve stem are connected. The inner wall of the third bearing is partially connected to the axial guide oil groove and the circumferential oil groove of the valve stem. The lubricating agent is added regularly, which significantly reduces the friction coefficient and reduces the wear of parts such as valve stem and packing. Due to the reduction of the friction coefficient, the friction force is reduced, the valve opening and closing torque is also greatly reduced, and the service life of valve packing and valve stem is greatly improved.

[0012] The first bearing assembly consists of an axial thrust bearing and several layers of gaskets. The gaskets can be self-lubricating polymer materials such as PTFE and PEEK, or they can be smooth metal gaskets, which simultaneously serve to seal and reduce frictional torque.

[0013] The left, middle, and right valve bodies adopt a three-piece forged steel split design. The sealing of the middle valve body and the left and right valve bodies is a static seal, consisting of three layers of sealing: the first layer is an all-metal sealing structure, formed by the raised sealing ring surfaces of the middle and left and right valve bodies; the second layer is a metal spiral wound gasket seal, formed by metal strips with graphite or PTFE and other materials; the third layer is a valve body O-ring seal, which has the advantages of good high-pressure sealing and high reliability.

[0014] The valve stem features an internal anti-blowout design, ensuring good safety performance.

[0015] This utility model has a reasonable structural design, good sealing performance, long service life and good practicality.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Enlarged schematic diagram of section I;

[0019] Figure 3 This is a schematic diagram of the valve stem structure in an embodiment of the present invention;

[0020] Figure 4 This is a partial cross-sectional view of an embodiment of the present utility model. Detailed Implementation

[0021] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] See Figures 1 to 4 This utility model discloses a low-torque, high-performance ball valve, comprising a left valve body 1, a middle valve body 2, and a right valve body 3. The left valve body 1, middle valve body 2, and right valve body 3 are assembled to form a valve cavity 4. A left valve seat 5, a valve ball 6, and a right valve seat 7 are disposed within the valve cavity 4. A valve stem mounting through hole 21 is provided at the upper end of the middle valve body 2, and a valve stem 8 is disposed within the valve stem mounting through hole 21. The lower end of the valve stem 8 extends into the valve cavity 4 and connects to the upper end of the valve ball 6. The upper end of the valve stem 8 protrudes from the valve stem mounting through hole 21. A lubrication system is provided between the valve stem 8 and the middle valve body 2. This lubrication system includes components disposed on the valve stem. The valve stem 8 contains an axial oil hole 81, a radial through oil hole 82, a circumferential oil groove 83, and a axial guide oil groove 84. The upper end of the axial oil hole 81 is provided with an oil cup mounting groove 85. An oil cup 9 is provided at the upper end of the valve stem 8, and the lower end of the oil cup 9 is installed in the oil cup mounting groove 85. The oil cup 9 communicates with the axial oil hole 81. The lower end of the axial oil hole 81 communicates with the radial through oil hole 82. The circumferential oil groove 83 is located at the outer port of the radial through oil hole 82. The upper end of the axial guide oil groove 84 communicates with the circumferential oil groove 83.

[0023] The left end of the left valve seat 5 is fixedly connected to the right end of the left valve body 1. Preferably, the left end of the left valve seat 5 is fixed to the right end of the left valve body 1 by welding or by bolts. The right end of the right valve seat 7 is fixedly connected to the left end of the right valve seat 7. Preferably, the right end of the right valve seat 7 is fixed to the left end of the right valve seat 7 by welding or by bolts. A valve ball connecting protrusion is integrally provided at the lower end of the valve stem 8. A connecting groove is provided at the upper end of the valve ball 6. The valve ball connecting protrusion is inserted into the connecting groove. The left valve body 1, the middle valve body 2, and the right valve body 3 are fixedly connected by bolts.

[0024] The valve body 2 has a first bearing mounting groove at the lower end of the valve stem mounting through hole 21. The inner wall of the valve stem mounting through hole 21 has a cap mounting groove, a packing groove and a second bearing mounting groove arranged from top to bottom. A first bearing assembly 10 is arranged in the first bearing mounting groove. A cap 11 is arranged in the cap mounting groove. A packing layer 12 is arranged in the packing groove. The lower end face of the cap 11 presses against the upper end face of the packing layer 12. A second bearing 13 is arranged in the second bearing mounting groove. The cap 11 is aligned with the valve stem mounting through hole and has a cap valve stem through hole. A third bearing mounting groove is arranged at the lower end of the inner wall of the cap valve stem through hole. A third bearing 14 is arranged in the third bearing mounting groove. The inner wall of the third bearing 14 is partially connected to the valve stem shaft guide oil groove 84 and the valve stem circumferential oil groove 83.

[0025] To make the structural design of this utility model more reasonable, as a preferred embodiment, the oil cup 9 is provided with an inner cavity 91. The upper end face of the oil cup 9 is provided with a lubricating oil inlet 92, which is connected to the inner cavity 91. The lower end face of the oil cup 9 is provided with a lubricating oil outlet 93, which is connected to the inner cavity 91. The inner cavity 91 is provided with a return spring 94 and a ball 95. The ball 95 is pressed against the lower port of the lubricating oil inlet 92 under the elastic force of the return spring 94.

[0026] The inner wall of the oil cup mounting groove 85 is provided with an internal thread, and the lower end of the oil cup 9 is provided with an external thread connection part. The oil cup 9 is connected and fixed to the internal thread in the oil cup mounting groove through the external thread connection part.

[0027] The lower end of the valve stem 8 is integrally provided with an anti-blowout protrusion 86, and the upper end face of the anti-blowout protrusion 86 is connected to the lower end face of the first bearing assembly 10.

[0028] A ring groove 87 is provided at a local position of the valve stem 8, and a valve stem O-ring seal 15 is provided in the ring groove 87. The valve stem 8 forms a seal with the inner wall surface of the valve stem mounting through hole 21 through the valve stem O-ring seal 15.

[0029] The left valve body 1, the middle valve body 2, and the right valve body 3 are provided with an O-ring 16, a metal spiral wound gasket 17, and an all-metal sealing structure 18, arranged sequentially from the inside to the outside.

[0030] In practical applications, a lubrication system is installed at the top of the valve stem. The oil cup, axial oil hole of the valve stem, radial through oil hole of the valve stem, circumferential oil groove of the valve stem, and axial guide oil groove of the valve stem are interconnected. The inner wall of the third bearing is partially connected to the axial guide oil groove and circumferential oil groove of the valve stem. Lubricating agent is added periodically, which significantly reduces the coefficient of friction and reduces the wear of parts such as valve stem and packing. Due to the reduction in the coefficient of friction, the friction force is reduced, the valve opening and closing torque is also greatly reduced, and the service life of valve packing and valve stem is greatly improved.

[0031] The first bearing assembly consists of an axial thrust bearing and several layers of gaskets. The gaskets can be self-lubricating polymer materials such as PTFE and PEEK, or they can be smooth metal gaskets, which simultaneously serve to seal and reduce frictional torque.

[0032] The left, middle, and right valve bodies adopt a three-piece forged steel split design. The sealing of the middle valve body and the left and right valve bodies is a static seal, consisting of three layers of sealing: the first layer is an all-metal sealing structure, formed by the raised sealing ring surfaces of the middle valve body and the left and right valve bodies; the second layer is a metal spiral wound gasket seal, formed by metal strips with graphite or PTFE and other materials; the third layer is a valve body O-ring seal, which has the advantages of good high-pressure sealing performance and high reliability.

[0033] The valve stem features an internal anti-blowout design, ensuring good safety performance.

[0034] This utility model has a reasonable structural design, good sealing performance, long service life, and good practicality. The above description of the specific embodiments of this utility model is only used to further illustrate this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made to this utility model by those skilled in the art based on the above description fall within the scope of protection of this utility model.

Claims

1. A low-torque, high-performance ball valve, comprising a left valve body (1), a middle valve body (2), and a right valve body (3), wherein the left valve body (1), the middle valve body (2), and the right valve body (3) are assembled to form a valve cavity (4), wherein a left valve seat (5), a valve ball (6), and a right valve seat (7) are disposed within the valve cavity (4), wherein a valve stem mounting through hole (21) is provided at the upper end of the middle valve body (2), wherein a valve stem (8) is disposed within the valve stem mounting through hole (21), wherein the lower end of the valve stem (8) extends into the valve cavity (4) and connects to the upper end of the valve ball (6), and the upper end of the valve stem (8) protrudes from the valve stem mounting through hole (21), characterized in that: A lubrication system is provided between the valve stem (8) and the middle valve body (2). The lubrication system includes an axial oil hole (81), a radial through oil hole (82), a circumferential oil groove (83), and a axial guide oil groove (84) provided in the valve stem (8). An oil cup mounting groove (85) is provided at the upper end of the axial oil hole (81). An oil cup (9) is provided at the upper end of the valve stem (8). The lower end of the oil cup (9) is installed in the oil cup mounting groove (85). The oil cup (9) communicates with the axial oil hole (81). The lower end of the axial oil hole (81) communicates with the radial through oil hole (82). The circumferential oil groove (83) is located at the outer port of the radial through oil hole (82). The upper end of the axial guide oil groove (84) communicates with the circumferential oil groove (83).

2. The low-torque, high-performance ball valve according to claim 1, characterized in that: The valve body (2) is provided with a first bearing mounting groove at the lower end of the valve stem mounting through hole (21). The inner wall of the valve stem mounting through hole (21) is provided with a pressure cap mounting groove, a packing groove and a second bearing mounting groove from top to bottom. A first bearing assembly (10) is provided in the first bearing mounting groove. A pressure cap (11) is provided in the pressure cap mounting groove. A packing layer (12) is provided in the packing groove. The lower end of the pressure cap (11) presses against the upper end of the packing layer (12). A second bearing (13) is provided in the second bearing mounting groove. A pressure cap valve stem through hole is provided at the position of the valve stem mounting through hole of the pressure cap (11). A third bearing mounting groove is provided at the lower end of the inner wall of the pressure cap valve stem through hole. A third bearing (14) is provided in the third bearing mounting groove. The inner wall of the third bearing (14) is partially connected to the valve stem shaft guide oil groove (84) and the valve stem circumferential oil groove (83).

3. The low-torque, high-performance ball valve according to claim 2, characterized in that: The oil cup (9) is provided with an inner cavity (91). A lubricating oil inlet (92) is provided on the upper end face of the oil cup (9), and the lubricating oil inlet (92) is connected to the inner cavity (91). A lubricating oil outlet (93) is provided on the lower end face of the oil cup (9), and the inner cavity (91) is connected to the lubricating oil outlet (93). A return spring (94) and a ball (95) are provided in the inner cavity (91). The ball (95) presses against the lower port of the lubricating oil inlet (92) under the elastic force of the return spring (94).

4. The low-torque, high-performance ball valve according to claim 3, characterized in that: The inner wall of the oil cup mounting groove (85) is provided with an internal thread, and the lower end of the oil cup (9) is provided with an external thread connection part. The oil cup (9) is connected and fixed to the internal thread in the oil cup mounting groove through the external thread connection part.

5. A low-torque, high-performance ball valve according to claim 4, characterized in that: The lower end of the valve stem (8) is integrally provided with an anti-blowout protrusion (86), and the upper end face of the anti-blowout protrusion (86) is connected to the lower end face of the first bearing assembly (10).

6. A low-torque, high-performance ball valve according to claim 5, characterized in that: A ring groove (87) is provided at a local position of the valve stem (8), and a valve stem O-ring (15) is provided in the ring groove (87). The valve stem (8) forms a seal with the inner wall of the valve stem mounting through hole (21) through the valve stem O-ring (15).

7. A low-torque, high-performance ball valve according to claim 1 or 6, characterized in that: The left valve body (1), the middle valve body (2) and the right valve body (3) are provided with valve body O-ring (16), metal spiral wound gasket (17) and all-metal sealing structure (18) from the inside to the outside.

Images