An eccentric c-valve

Abstract

The utility model discloses an eccentric C type valve, including valve body, spring seat and spring, the top of valve body is fixed with the valve cover through bolt, and the both ends of valve body are established with upper end passage and lower end passage respectively, and the top one side of valve cover is established with the mounting hole, and the valve rod is rotatably inserted in the mounting hole, and the bottom of valve rod passes valve cover and extends into the inside of valve body in proper order, and the bottom of valve rod is fixedly connected with the sphere, and the inner bottom wall of valve body is embedded with the sphere lower thrust pad, the utility model discloses the cooperation structure of setting valve seat, spring seat, spring and screw, and valve seat can move axially under the action of medium pressure or spring pre -tightening force, realizes the sealing compensation function, when the medium enters from left side or right side valve cavity, valve seat is automatically pressed tightly sphere under the action of pressure, or provides initial sealing force through spring, ensures the reliability of two -way sealing, simultaneously, the structure can break contact quickly when the sphere rotates, remarkably reduces the operating torque, improves the wear resistance and service life of valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an eccentric C-type valve. Background Technology

[0002] As the application fields of ball valves expand, customers are placing increasingly higher demands on valve quality and technology. Traditional ball valves have large sealing surfaces, high torque, and suffer significant wear over long-term use. This can lead to seizing or incomplete opening / closing due to factors such as the medium and temperature, causing valve leakage and ultimately resulting in significant property damage and personal injury.

[0003] For example, a two-way valve using a C-shaped ball core, with application number CN201520307454.3 and authorization announcement date of 20150826, includes a left valve body, a right valve body, and a C-shaped ball core; one side of the left valve body is fixedly connected to one side of the right valve body; the left and right valve bodies form a valve cavity; the left valve body has an inlet communicating with the valve cavity, and the right valve body has an outlet communicating with the valve cavity; the C-shaped ball core is disposed in the valve cavity, and the C-shaped ball core has a C-shaped channel that is always communicating with the outlet; the right valve body has a valve stem that drives the C-shaped ball core to rotate; the right valve body also has a support seat for supporting the C-shaped ball core. The beneficial effects of this utility model are: this utility model changes the original straight channel to a C-shaped channel. When the valve is half-open, the medium is discharged through the C-shaped channel, and at the same time, the valve cavity is flushed to wash away the medium deposited in the valve cavity. At any time, the C-shaped channel is connected to the outlet, and the medium will not be deposited in the valve cavity. It features a simple structure, long service life, and requires virtually no maintenance.

[0004] Type C ball valves typically employ a fixed seat and ball structure. While this reduces the sealing contact area and improves torque and wear issues to some extent, it still has the following drawbacks: Both the seat and ball are fixed structures, lacking an effective sealing compensation mechanism, leading to a decline in sealing performance with long-term use or changes in operating conditions; the sealing direction is unidirectional, making it difficult to meet the requirements of bidirectional sealing; the torque required for the initial sealing stage is still relatively high, which is detrimental to energy saving and actuator selection; and the structure does not consider online maintenance needs, requiring the entire valve to be removed from the pipeline for disassembly and repair, affecting continuous system operation. Therefore, there is an urgent need to design an eccentric Type C valve to solve these problems. Utility Model Content

[0005] The purpose of this invention is to provide an eccentric C-type valve to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An eccentric C-type valve includes a valve body, a spring seat, and a spring. A valve cover is bolted to the top of the valve body. The valve body has an upper channel and a lower channel at both ends. A mounting hole is formed on one side of the top of the valve cover, into which a valve stem is rotatably inserted. The bottom end of the valve stem passes through the valve cover and extends into the valve body, and is fixedly connected to a ball. A lower ball thrust pad is embedded in the inner bottom wall of the valve body. A lower ball bearing is provided at the top of the lower ball thrust pad. An upper ball bearing is fitted onto the bottom end of the valve stem. The ball is held between the lower ball bearing and the upper ball bearing. Between them, a valve seat is snapped into the upper channel, and multiple screws are arranged around the circumference of the valve seat. One end of each screw passes through a spring seat and a spring in sequence, and the screw is threaded into a threaded hole on the side wall of the upper channel. The spring seat is located on the back side of the valve seat, with one end of the spring seat in contact with the valve seat and the other end of the spring seat in contact with the inner wall of the upper channel. The spring is sleeved on the screw and is pre-compressed between the spring seat and the inner wall of the upper channel. Valve seat packing is filled between the valve seat and the inner wall of the upper channel. An O-ring is embedded in one end of the valve seat, and the O-ring is in contact with one side of the inner wall of the upper channel.

[0008] Furthermore, a valve stem bearing is also installed in the mounting hole, through which the valve stem passes and mates with the inner ring.

[0009] Furthermore, a valve stem thrust pad is inserted into the mounting hole above the valve stem bearing, the valve stem passes through the valve stem thrust pad, and the bottom end of the valve stem thrust pad contacts the top end of the valve stem bearing.

[0010] Furthermore, a packing gland fastener is inserted into the opening at one end of the mounting hole, and the packing gland fastener is installed on the top of the valve body by bolts.

[0011] Furthermore, the mounting hole is filled with a valve stem packing assembly, and the mounting hole is located between the packing gland fastener and the valve stem thrust pad, through which the valve stem passes.

[0012] Furthermore, the top end of the valve stem has an operating part for connecting the drive device, and the center of the ball is eccentrically set relative to the axis of the valve stem.

[0013] In the above technical solution, the eccentric C-type valve provided by this utility model has the following advantages:

[0014] (1) By setting a valve seat, spring seat, spring and screw in a matching structure, the valve seat can move axially under the action of medium pressure or spring preload, thus realizing the sealing compensation function. When the medium enters from the left or right valve cavity, the valve seat automatically presses the ball under pressure, or provides initial sealing force through the spring, ensuring the reliability of bidirectional sealing. At the same time, the structure can quickly disengage when the ball rotates, which significantly reduces the operating torque and improves the wear resistance and service life of the valve.

[0015] (2) Because the ball adopts an eccentric design, when the ball rotates, the ball and the valve seat can quickly disengage, avoiding the frictional resistance of traditional ball valves, thereby greatly reducing the operating torque. This design not only reduces the load on the actuator, which is beneficial to energy saving, but also extends the life of key valve components, and is especially suitable for applications that require frequent switching.

[0016] (3) This utility model enhances the sealing performance of the valve seat and valve stem by combining the valve seat packing, O-ring and multi-stage packing group, preventing medium leakage. The spring preload mechanism ensures the initial sealing under low pressure conditions, while the sealing compensation activated by the medium pressure enables the valve to adapt to bidirectional pressure changes, improving the stability and safety of the valve under complex conditions such as high temperature and high pressure.

[0017] (4) The valve of this utility model adopts an upper-mounted structure. The valve cover is connected to the valve body by bolts. After the valve cover is removed, the ball, valve seat and related components can be taken out directly from the top. There is no need to remove the entire valve from the pipeline. This greatly simplifies the maintenance process, reduces downtime, and improves the continuous operation efficiency of the system. It is suitable for harsh industrial environments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of an eccentric C-type valve according to the present invention.

[0020] Figure 2 This is a schematic diagram of the valve body, valve cover, and ball structure provided for an embodiment of an eccentric C-type valve according to this utility model.

[0021] Figure 3 This invention provides an embodiment of an eccentric C-type valve. Figure 2 Enlarged view of the structure of section A in the middle.

[0022] Figure 4 This invention provides an embodiment of an eccentric C-type valve. Figure 2 Enlarged view of the structure of section B in the middle.

[0023] Figure 5 This invention provides an embodiment of an eccentric C-type valve. Figure 2 Enlarged view of the structure of section C.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Valve body; 2. Valve cover; 3. Upper passage; 4. Lower passage; 5. Valve seat; 6. Ball; 7. Valve stem; 8. Screw; 9. Spring seat; 10. Spring; 11. O-ring; 12. Valve seat packing; 13. Lower ball bearing; 14. Lower ball thrust pad; 16. Valve stem packing assembly; 17. Packing gland fastener; 18. Valve stem thrust pad; 19. Valve stem bearing; 20. Upper ball bearing; 21. Mounting hole. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1-5 As shown in the figure, an eccentric C-type valve provided by this utility model embodiment includes a valve body 1, a spring seat 9, and a spring 10. A valve cover 2 is fixed to the top of the valve body 1 by bolts. An upper channel 3 and a lower channel 4 are respectively opened at both ends of the valve body 1. A mounting hole 21 is opened on one side of the top of the valve cover 2. A valve stem 7 is rotatably inserted into the mounting hole 21. The bottom end of the valve stem 7 passes through the valve cover 2 and extends into the interior of the valve body 1. The bottom end of the valve stem 7 is fixedly connected to a ball 6. A lower ball thrust pad 14 is embedded in the inner bottom wall of the valve body 1. A lower ball bearing 13 is provided at the top of the lower ball thrust pad 14. An upper ball bearing 20 is sleeved on the bottom end of the valve stem 7. The ball 6 is clamped in the lower ball bearing 13. Between the ball bearing 20 and the upper channel 3, a valve seat 5 is snapped into place. Multiple screws 8 are arranged around the circumference of the valve seat 5. One end of the screw 8 passes through the spring seat 9 and the spring 10 in sequence, and the screw 8 is threadedly connected to the threaded hole on the side wall of the upper channel 3. The spring seat 9 is located on the back side of the valve seat 5. One end of the spring seat 9 contacts the valve seat 5, and the other end of the spring seat 9 contacts the inner wall of the upper channel 3. The spring 10 is sleeved on the screw 8. The spring 10 is pre-compressed between the spring seat 9 and the inner wall of the upper channel 3. Valve seat packing 12 is filled between the valve seat 5 and the inner wall of the upper channel 3. An O-ring 11 is embedded in one end of the valve seat 5, and the O-ring 11 contacts one side of the inner wall of the upper channel 3.

[0028] Specifically, in this embodiment, the valve includes a valve body 1, a spring seat 9, and a spring 10. The valve body 1 serves as the main pressure-bearing housing of the valve, and a valve cavity is formed inside the valve body 1, connecting the upper channel 3 and the lower channel 4. The top of the valve body 1 is connected to the valve cover 2 by bolts, forming an upper-mounted structure for easy maintenance. During operation, the valve body 1 bears the pressure of the medium and supports all internal components. The spring seat 9 is located on the back side of the valve seat 5, with one end in contact with the valve seat 5 and the other end in contact with the inner wall of the upper channel 3. The spring seat 9 transmits the preload force of the spring 10 to the valve seat 5, ensuring that the valve seat 5 always tends to press against the ball 6. The spring 10 is sleeved on the screw 8 and pre-compressed between the spring seat 9 and the inner wall of the upper channel 3. The spring 10 provides... Under low-pressure conditions, the initial sealing force pushes the valve seat 5 to press the ball 6. When the medium pressure increases, the spring 10 allows the valve seat 5 to move further, enhancing the seal. The valve cover 2 is bolted to the top of the valve body 1, forming a sealing cavity. The mounting hole 21 on the valve cover 2 is used to install the valve stem 7 and related components. When maintenance is required, the valve cover 2 can be removed from the top to take out the internal components, enabling online maintenance without disassembling the entire valve and removing it from the pipeline. The valve body 1 has an upper channel 3 and a lower channel 4 at both ends, which serve as the inlet and outlet of the medium. During operation, the medium flows from the corresponding upper channel. The valve stem 7 enters through channel 3 or the lower channel 4, pushing the valve seat 5 to achieve a seal. The channel design allows for bidirectional media flow. A mounting hole 21 is provided on one side of the top of the valve cover 2. This mounting hole 21 is used to install the valve stem 7, bearing, and valve stem packing assembly 16. The design of the mounting hole 21 allows the valve stem 7 to rotate smoothly and accommodates the sealing components. The valve stem 7 is rotatably inserted into the mounting hole 21. The valve stem 7 is connected to an external drive device such as a handle or actuator, and its bottom end is fixedly connected to the ball 6. The valve stem 7 is inserted into the valve body 1 through the mounting hole 21, and rotates when the valve stem 7 rotates, causing the ball 6 to rotate. The seal of the valve stem 7 is ensured by the valve stem packing assembly 16 to prevent media leakage. The bottom end of the valve stem 7 passes through the valve cover 2 and extends into the valve body 1. The bottom end of the valve stem 7 is fixedly connected to the ball 6. A ball lower thrust pad 14 is embedded in the inner bottom wall of the valve body 1. The ball lower thrust pad 14 is located at the top of the ball lower bearing 13 and bears the axial thrust of the ball 6 to prevent the ball 6 from sinking or wearing the valve body 1. A ball lower bearing 13 is set at the top of the ball lower thrust pad 14. The ball lower bearing 13 is embedded in the inner bottom wall of the valve body 1 to support the bottom of the ball 6 and reduce the frictional resistance when the ball 6 rotates. The bearing material is usually a self-lubricating material to improve wear resistance. A ball upper bearing 20 is sleeved on the bottom end of the valve stem 7. The ball upper bearing 20 is sleeved on the bottom end of the valve stem 7 and located at the top of the ball 6. Together with the ball lower bearing 13, it supports the ball 6 to ensure stable rotation of the ball 6 and reduce friction.The ball 6 is clamped between the lower bearing 13 and the upper bearing 20. A valve seat 5 is engaged in the upper channel 3. The valve seat 5 and the ball 6 form a sealing pair. Under the action of medium pressure, the valve seat 5 can move axially. When there is medium pressure in the upper channel 3, the pressure pushes the valve seat 5 against the ball 6. When there is medium pressure in the lower channel 4, the pressure achieves sealing through the O-ring 11 and the valve seat 5 itself. The movement of the valve seat 5 is compensated by the spring 10 to ensure the initial seal under low pressure. Multiple screws 8 are arranged circumferentially along the valve seat 5. One end of the screw 8 passes through the spring seat 9 and the spring 10 in sequence, and the screw 8 is threadedly connected to the threaded hole on the side wall of the upper channel 3. The spring seat 9 is located on the back side of the valve seat 5, and one end of the spring seat 9 is in contact with the valve seat 5. The other end of the spring seat 9 contacts the inner wall of the upper channel 3. The spring 10 is sleeved on the screw 8 and pre-compressed between the spring seat 9 and the inner wall of the upper channel 3. Valve seat packing 12 fills the space between the valve seat 5 and the inner wall of the upper channel 3, enhancing the sealing performance and preventing medium leakage along the circumference of the valve seat 5. The packing material typically has wear-resistant and high-temperature resistant properties. An O-ring 11 is embedded at one end of the valve seat 5. The O-ring 11 is installed at the contact point between the valve seat 5 and the valve body 1, forming a static seal. When there is medium pressure in the right valve chamber, the O-ring 11 prevents medium leakage from around the valve seat 5, assisting in achieving bidirectional sealing. The O-ring 11 also contacts one side of the inner wall of the upper channel 3.

[0029] This utility model provides an eccentric C-type valve. Through the cooperative structure of valve seat 5, spring seat 9, spring 10 and screw 8, the valve seat 5 can move axially under the action of medium pressure or spring 10 preload, realizing the sealing compensation function. When the medium enters from the left or right valve cavity, the valve seat automatically presses the ball 6 under pressure, or provides initial sealing force through spring 10, ensuring the reliability of bidirectional sealing. At the same time, this structure can quickly disengage when the ball rotates, significantly reducing the operating torque and improving the wear resistance and service life of the valve.

[0030] In one embodiment provided by this utility model, such as Figure 1-2 and Figure 5As shown, a valve stem bearing 19 is also installed in the mounting hole 21. The valve stem 7 passes through its inner ring. The valve stem bearing 19 supports the rotation of the valve stem 7, reduces the rotational torque, and improves the valve response speed. The valve stem 7 passes through the valve stem bearing 19 and mates with its inner ring. A valve stem thrust pad 18 is inserted into the mounting hole 21 above the valve stem bearing 19. The valve stem thrust pad 18 is installed in the mounting hole 21, above the valve stem bearing 19, and bears the axial thrust of the valve stem 7, preventing axial movement of the valve stem 7 and reducing friction. The valve stem 7 passes through the valve stem thrust pad 18, and the bottom end of the valve stem thrust pad 18 contacts the top end of the valve stem bearing 19. A packing gland fastener 17 is inserted into the opening at one end of the mounting hole 21. The packing gland fastener 17 is bolted to the top of the valve body 1 to fix the packing gland 15 and the valve stem packing assembly 16. Adjusting the fastener can adjust the compression of the valve stem packing assembly 16 and optimize the sealing effect. The packing gland fastener 17 is bolted to the top of the valve body 1. The mounting hole 21 is filled with the valve stem packing assembly 16. The valve stem packing assembly 16 is installed in the mounting hole 21 and is located between the packing gland fastener 17 and the valve stem thrust pad 18. The valve stem packing assembly 16 wraps around the valve stem 7 to prevent the medium from leaking along the axial direction of the valve stem 7. When the valve is running, the valve stem packing assembly 16 is compressed by the gland to form a dynamic seal. The mounting hole 21 is located between the packing gland fastener 17 and the valve stem thrust pad 18, and the valve stem 7 passes through the valve stem packing assembly 16.

[0031] In another embodiment provided by this utility model, such as Figure 1-2 and Figure 5 As shown, the top of the valve stem 7 has an operating part for connecting the drive device, and the center of the ball 6 is eccentrically set relative to the axis of the valve stem 7.

[0032] Example 1

[0033] An eccentric C-type valve includes a valve body 1, a spring seat 9, and a spring 10. The valve body 1 serves as the main pressure-bearing housing of the valve, forming a valve cavity inside, connecting an upper channel 3 and a lower channel 4. The top of the valve body 1 is bolted to a valve cover 2, forming an upper-mounted structure for easy maintenance. During operation, the valve body 1 bears the pressure of the medium and supports all internal components. The spring seat 9 is located on the back side of the valve seat 5, with one end contacting the valve seat 5 and the other end contacting the inner wall of the upper channel 3. The spring seat 9 transmits the preload force of the spring 10 to the valve seat 5, ensuring that the valve seat 5 always tends to press against the ball 6. The spring 10 is sleeved on a screw 8 and pre-compressed between the spring seat 9 and the inner wall of the upper channel 3. The spring 10 provides... Under low-pressure conditions, the initial sealing force pushes the valve seat 5 to press the ball 6. When the medium pressure increases, the spring 10 allows the valve seat 5 to move further, enhancing the seal. The valve cover 2 is bolted to the top of the valve body 1, forming a sealing cavity. The mounting hole 21 on the valve cover 2 is used to install the valve stem 7 and related components. When maintenance is required, the valve cover 2 can be removed from the top to take out the internal components, enabling online maintenance without disassembling the entire valve and removing it from the pipeline. The valve body 1 has an upper channel 3 and a lower channel 4 at both ends, which serve as the inlet and outlet of the medium. During operation, the medium flows from the corresponding upper channel. The valve stem 7 enters through channel 3 or the lower channel 4, pushing the valve seat 5 to achieve a seal. The channel design allows for bidirectional media flow. A mounting hole 21 is provided on one side of the top of the valve cover 2. This mounting hole 21 is used to install the valve stem 7, bearing, and valve stem packing assembly 16. The design of the mounting hole 21 allows the valve stem 7 to rotate smoothly and accommodates the sealing components. The valve stem 7 is rotatably inserted into the mounting hole 21. The valve stem 7 is connected to an external drive device such as a handle or actuator, and its bottom end is fixedly connected to the ball 6. The valve stem 7 is inserted into the valve body 1 through the mounting hole 21, and rotates when the valve stem 7 rotates, causing the ball 6 to rotate. The seal of the valve stem 7 is ensured by the valve stem packing assembly 16 to prevent media leakage. The bottom end of the valve stem 7 passes through the valve cover 2 and extends into the valve body 1. The bottom end of the valve stem 7 is fixedly connected to the ball 6. A ball lower thrust pad 14 is embedded in the inner bottom wall of the valve body 1. The ball lower thrust pad 14 is located at the top of the ball lower bearing 13 and bears the axial thrust of the ball 6 to prevent the ball 6 from sinking or wearing the valve body 1. A ball lower bearing 13 is set at the top of the ball lower thrust pad 14. The ball lower bearing 13 is embedded in the inner bottom wall of the valve body 1 to support the bottom of the ball 6 and reduce the frictional resistance when the ball 6 rotates. The bearing material is usually a self-lubricating material to improve wear resistance. A ball upper bearing 20 is sleeved on the bottom end of the valve stem 7. The ball upper bearing 20 is sleeved on the bottom end of the valve stem 7 and located at the top of the ball 6. Together with the ball lower bearing 13, it supports the ball 6 to ensure stable rotation of the ball 6 and reduce friction.The ball 6 is clamped between the lower bearing 13 and the upper bearing 20. A valve seat 5 is engaged in the upper channel 3. The valve seat 5 and the ball 6 form a sealing pair. Under the action of medium pressure, the valve seat 5 can move axially. When there is medium pressure in the upper channel 3, the pressure pushes the valve seat 5 against the ball 6. When there is medium pressure in the lower channel 4, the pressure achieves sealing through the O-ring 11 and the valve seat 5 itself. The movement of the valve seat 5 is compensated by the spring 10 to ensure the initial seal under low pressure. Multiple screws 8 are arranged circumferentially along the valve seat 5. One end of the screw 8 passes through the spring seat 9 and the spring 10 in sequence, and the screw 8 is threadedly connected to the threaded hole on the side wall of the upper channel 3. The spring seat 9 is located on the back side of the valve seat 5, and one end of the spring seat 9 is in contact with the valve seat 5. The other end of the spring seat 9 contacts the inner wall of the upper channel 3. The spring 10 is sleeved on the screw 8 and pre-compressed between the spring seat 9 and the inner wall of the upper channel 3. Valve seat packing 12 fills the space between the valve seat 5 and the inner wall of the upper channel 3, enhancing the sealing performance and preventing medium leakage along the circumference of the valve seat 5. The packing material typically has wear-resistant and high-temperature resistant properties. An O-ring 11 is embedded at one end of the valve seat 5. The O-ring 11 is installed at the contact point between the valve seat 5 and the valve body 1, forming a static seal. When there is medium pressure in the right valve chamber, the O-ring 11 prevents medium leakage from around the valve seat 5, assisting in achieving bidirectional sealing. The O-ring 11 also contacts one side of the inner wall of the upper channel 3.

[0034] Example 2

[0035] This embodiment further defines the features of Embodiment 1. A valve stem bearing 19 is also installed within the mounting hole 21. The valve stem 7 passes through its inner ring, and the valve stem bearing 19 supports the rotation of the valve stem 7, reducing rotational torque and improving valve response speed. The valve stem 7 passes through the valve stem bearing 19 and engages with its inner ring. A valve stem thrust pad 18 is inserted into the mounting hole 21 above the valve stem bearing 19, bearing the axial thrust of the valve stem 7, preventing axial movement of the valve stem 7, and reducing friction. The valve stem 7 passes through the valve stem thrust pad 18, with the bottom end of the valve stem thrust pad 18 contacting the top end of the valve stem bearing 19. A packing gland fastener 17 is inserted into the opening of one end of the mounting hole 21, and the packing gland fastener 17 is secured by screws. A bolt is installed on the top of the valve body 1 to fix the packing gland 15 and the valve stem packing assembly 16. Adjusting the fastener can adjust the compression of the valve stem packing assembly 16 and optimize the sealing effect. The packing gland fastener 17 is installed on the top of the valve body 1 by bolts. The valve stem packing assembly 16 is filled inside the mounting hole 21. The valve stem packing assembly 16 is installed in the mounting hole 21 and is located between the packing gland fastener 17 and the valve stem thrust pad 18. The valve stem packing assembly 16 wraps around the valve stem 7 to prevent the medium from leaking along the axial direction of the valve stem 7. When the valve is running, the valve stem packing assembly 16 is compressed by the gland to form a dynamic seal. The mounting hole 21 is located between the packing gland fastener 17 and the valve stem thrust pad 18, and the valve stem 7 passes through the valve stem packing assembly 16. An operating part for connecting the drive device is formed at the top of the valve stem 7, and the center of the ball 6 is eccentrically set relative to the axis of the valve stem 7.

[0036] Working principle: When the valve is closed, the ball 6 blocks the flow of the medium. If the medium enters from the upper channel 3, the medium pressure acts on the valve seat 5, pushing the valve seat 5 to move axially and press against the ball 6, thus achieving a seal. At the same time, the spring 10 provides auxiliary force to ensure a low-pressure seal. If the medium enters from the lower channel 4, the medium pressure achieves a seal through the O-ring 11 and the valve seat 5. The contact surface between the ball 6 and the valve seat 5 also forms a seal. The preload of the spring 10 always maintains the initial seal, thus ensuring a reliable seal under pressure in any direction. Because the center of the ball 6 is eccentric to the axis of the valve stem 7, When the valve stem 7 begins to rotate, the ball 6 quickly disengages from the valve seat 5 to avoid sliding friction. The spring 10 allows the valve seat 5 to retract, further reducing resistance. The lower ball bearing 13, the upper ball bearing 20, and the valve stem bearing 19 work together to reduce rotational friction, significantly reducing the operating torque, making it suitable for frequent switching applications. When the valve requires maintenance, loosen the bolts on the valve cover 2, remove the valve cover 2, and then sequentially remove the valve stem 7, ball 6, valve seat 5, and related components from the top. This top-mounted design simplifies the maintenance process and reduces downtime without disassembling the valve from the pipeline.

[0037] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An eccentric C-type valve, comprising a valve body (1), a spring seat (9), and a spring (10), characterized in that, The valve body (1) is bolted to the top of a valve cover (2). The valve body (1) has an upper channel (3) and a lower channel (4) at both ends. A mounting hole (21) is provided on one side of the top of the valve cover (2). A valve stem (7) is rotatably inserted into the mounting hole (21). The bottom end of the valve stem (7) passes through the valve cover (2) and extends into the valve body (1). The bottom end of the valve stem (7) is fixedly connected to a ball (6). A ball lower thrust pad (14) is embedded in the inner bottom wall of the valve body (1). A ball lower bearing (13) is provided at the top of the ball lower thrust pad (14). An upper ball bearing (20) is sleeved on the bottom end of the valve stem (7). The ball (6) is clamped between the ball lower bearing (13) and the ball upper bearing (20). A [missing information] is inserted into the upper channel (3). A valve seat (5) is provided with multiple screws (8) arranged around the circumference of the valve seat (5). One end of the screw (8) passes through the spring seat (9) and the spring (10) in sequence, and the screw (8) is threadedly connected to the threaded hole on the side wall of the upper channel (3). The spring seat (9) is located on the back side of the valve seat (5). One end of the spring seat (9) is in contact with the valve seat (5), and the other end of the spring seat (9) is in contact with the inner wall of the upper channel (3). The spring (10) is sleeved on the screw (8). The spring (10) is pre-compressed between the spring seat (9) and the inner wall of the upper channel (3). The valve seat (5) and the inner wall of the upper channel (3) are filled with valve seat packing (12). One end of the valve seat (5) is embedded with an O-ring (11), and the O-ring (11) is in contact with one side of the inner wall of the upper channel (3).

2. The eccentric C-type valve according to claim 1, characterized in that, A valve stem bearing (19) is also installed in the mounting hole (21), through which the valve stem (7) passes and engages with the inner ring.

3. An eccentric C-type valve according to claim 2, characterized in that, A valve stem thrust pad (18) is inserted into the mounting hole (21) above the valve stem bearing (19). The valve stem (7) passes through the valve stem thrust pad (18), and the bottom end of the valve stem thrust pad (18) is in contact with the top end of the valve stem bearing (19).

4. An eccentric C-type valve according to claim 3, characterized in that, A packing gland fastener (17) is inserted into the opening at one end of the mounting hole (21), and the packing gland fastener (17) is installed on the top of the valve body (1) by bolts.

5. An eccentric C-type valve according to claim 4, characterized in that, The mounting hole (21) is filled with a valve stem packing assembly (16). The mounting hole (21) is located between the packing gland fastener (17) and the valve stem thrust pad (18). The valve stem (7) passes through the valve stem packing assembly (16).

6. An eccentric C-type valve according to claim 1, characterized in that, The valve stem (7) has an operating part for connecting the drive device at its top end, and the center of the ball (6) is eccentrically set relative to the axis of the valve stem (7).

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