Differential pressure type metal hard sealing C-shaped ball valve

Abstract

The utility model discloses a differential pressure type metal hard sealing C-shaped ball valve, which belongs to the technical field of valves and comprises a valve body, a valve cover is fixed at the end of the valve body, a movable valve seat capable of being movably adjusted is arranged in the valve cover, and a C-shaped ball is mounted in the valve body. A controllable valve seat cavity A and a controllable valve seat cavity B which are respectively communicated with the first liquid conveying channel and the second liquid conveying channel are arranged in the valve cover; a first liquid inlet valve and a second liquid inlet valve are respectively mounted at the end parts of the first liquid conveying channel and the second liquid conveying channel; hydraulic oil enters a cavity A of the controllable valve seat through the first liquid inlet valve and the first liquid conveying channel, so that the movable valve seat is hydraulically pushed to move forwards to be tightly pressed on the spherical surface of the C-shaped ball, sealing specific pressure is generated, valve closing sealing is achieved, the movable valve seat is hydraulically driven to move back and forth to be adjusted, and sealing is achieved. Therefore, friction between sealing pairs is greatly reduced in the opening and closing process of the valve, operation torque is reduced, and the service life of the sealing pairs is effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a differential pressure metal hard seal C-type ball valve. Background Technology

[0002] The C-type ball valve is a high-performance industrial valve. Its core feature is its unique C-shaped ball structure design. Compared with traditional ball valves, the C-type ball valve has a C-shaped flow channel inside the ball. When the valve is opened, the flow channel and the pipeline form an almost straight flow path, which greatly reduces fluid resistance. It is particularly suitable for media with high flow rate, high viscosity or containing solid particles. It is suitable for conveying media containing solid particles and is widely used in petroleum, chemical, papermaking, power and other industries.

[0003] When using existing C-type ball valves, the metal-to-metal friction generated during the opening and closing process of the metal sealing pair reduces the service life of the sealing surface and increases the operating torque of the valve. This is especially true for valves under automatic control, which requires a larger actuator and results in higher costs.

[0004] Therefore, it is necessary to provide a differential pressure metal hard seal C-type ball valve to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a differential pressure metal hard seal C-type ball valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following solution to the aforementioned technical problems: A differential pressure metal hard-seal C-type ball valve includes a valve body, a valve cover fixed to the end of the valve body, a movable and adjustable valve seat disposed inside the valve cover, a C-type ball installed inside the valve body for opening and closing cooperation with the movable valve seat, a first infusion channel and a second infusion channel being opened inside the valve cover, and a controllable valve seat chamber A and a controllable valve seat chamber B respectively communicating with the first infusion channel and the second infusion channel, respectively, with a first inlet valve and a second inlet valve installed at the ends of the first infusion channel and the second infusion channel, and the movable valve seat is reciprocated and adjusted along the pipeline axis by hydraulic control.

[0007] As a further embodiment of this utility model, the sealing surface of the movable valve seat is coated with a coating and the coating thickness is set to be greater than 0.3mm.

[0008] As a further embodiment of this utility model, the rotation center of the C-shaped ball is offset from the center of the movable valve seat by a certain distance, so that the rotation radius of the C-shaped ball is divided into long radius rotation and short radius rotation. When closed, the short radius enters the valve seat first, and the valve becomes tighter and tighter, thus achieving forced sealing.

[0009] As a further embodiment of this utility model, a rubber sealing ring is fixed on the side of the movable valve seat, and multiple rubber sealing rings are provided.

[0010] As a further embodiment of this utility model, a valve stem for controlling the C-shaped ball is installed on the valve body, and an upper support shaft for auxiliary support of the C-shaped ball is installed on the movable valve seat.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: When the valve is in the closed position, under the control of the hydraulic system, hydraulic oil is input into the first delivery channel through the first inlet valve. The hydraulic oil enters the controllable valve seat chamber A through the first inlet valve and the first delivery channel, thereby hydraulically pushing the movable valve seat forward and pressing it tightly onto the C-shaped ball surface, generating a sealing pressure to achieve valve closure and sealing. When the valve is open, under the control of the hydraulic system, hydraulic oil is input into the second delivery channel through the second inlet valve. The hydraulic oil enters the controllable valve seat chamber B through the second inlet valve and the second delivery channel, thereby hydraulically pushing the movable valve seat backward, causing the movable valve seat to disengage from the C-shaped ball surface. At this time, the valve is opened. By hydraulically driving the reciprocating movement of the movable valve seat, the friction between the sealing pairs is greatly reduced during the opening and closing process, achieving near-zero friction during opening and closing. At the same time, the valve is always in the no-stroke operation, greatly reducing the operating torque and greatly extending the service life of the sealing pairs. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0013] Figure 1 This is a schematic diagram of the internal structure of the valve body of this utility model;

[0014] Figure 2 This is a schematic diagram of the C-shaped eccentric sphere structure of this utility model.

[0015] The attached diagram lists the components represented by each number as follows:

[0016] 1. Valve cover; 2. First inlet valve; 3. Movable valve seat; 4. Second inlet valve; 5. Valve body; 6. Upper support shaft; 7. Valve stem; 8. C-shaped ball; 9. Rubber sealing ring; 10. First infusion channel; 11. Second infusion channel; 12. Controllable valve seat chamber A; 13. Controllable valve seat chamber B. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments.

[0018] Please see Figure 1-2This utility model provides a differential pressure metal hard-seal C-type ball valve, including a valve body 5, a valve cover 1 fixed to the end of the valve body 5, a movable and adjustable valve seat 3 disposed inside the valve cover 1, a C-type ball 8 installed inside the valve body 5 to cooperate with the movable valve seat 3 for opening and closing, a first infusion channel 10 and a second infusion channel 11 opened inside the valve cover 1, and a controllable valve seat chamber A12 and a controllable valve seat chamber B13 respectively communicating with the first infusion channel 10 and the second infusion channel 11. The first infusion channel 10... A first inlet valve 2 and a second inlet valve 4 are respectively installed at the ends of the second infusion channel 11. The movable valve seat 3 is adjusted by reciprocating along the pipeline axis through hydraulic control. When the valve is in the closed position, under the control of the hydraulic system, hydraulic oil is input into the first infusion channel 10 through the first inlet valve 2. The hydraulic oil enters the controllable valve seat chamber A12 through the first inlet valve 2 and the first infusion channel 10, thereby hydraulically pushing the movable valve seat 3 forward and pressing it tightly against the surface of the C-shaped ball 8 to generate a sealing pressure and achieve valve closure sealing. When the valve is open... Upon startup, under the control of the hydraulic system, hydraulic oil is input into the second delivery channel 11 through the second inlet valve 4. The hydraulic oil then enters the controllable valve seat chamber B13 through the second inlet valve 4 and the second delivery channel 11, thereby hydraulically pushing the movable valve seat 3 backward, causing it to disengage from the C-shaped ball 8. This opens the valve. The reciprocating movement of the movable valve seat 3, driven by hydraulic pressure, significantly reduces friction between the sealing surfaces during opening and closing, achieving near-zero friction during operation. The valve is always in a no-stroke operation, which greatly reduces the operating torque and extends the service life of the sealing pair. The movement of the movable valve seat 3 and the opening and closing of the valve are controlled by PLC programming. Before the valve is opened, the movable valve seat 3 automatically retracts, and after the valve is closed, the movable valve seat 3 automatically moves forward to seal. The movable valve seat 3 is made of A182F51 stainless steel. A182F51 is an austenitic + ferritic biaxial stainless steel with high strength, good toughness and high surface hardness, which can meet the requirements of long-term resistance of flow components to media erosion.

[0019] Further as Figure 1 As shown, it is worth noting that the sealing surface of the movable valve seat 3 is coated with a coating and the coating thickness is set to be greater than 0.3mm; the sealing surface of the movable valve seat 3 is coated with a WC or CrC-based wear-resistant and corrosion-resistant coating with high hardness and good wear resistance using HVOF spraying technology.

[0020] Further as Figure 2As shown, it is worth noting that the rotation center of the C-type ball 8 is offset from the center of the movable valve seat 3 by a certain distance, so that the rotation radius of the C-type ball 8 is divided into long radius rotation and short radius rotation. When closed, the short radius enters the valve seat first, and the closure becomes tighter and tighter, thus achieving a forced seal. By offsetting the rotation center of the C-type ball 8 from the center of the movable valve seat 3 by a certain distance, the rotation radius of the C-type ball 8 is divided into long radius rotation and short radius rotation. The movement trajectory of the C-type ball 8 is a dual vector motion, namely rotation + translation. When closed, the short radius enters the movable valve seat 3 first. As the closure continues, the spherical rotation radius of the C-type ball 8 gradually increases, and the closure becomes tighter and tighter, thus achieving a forced seal, improving the sealing effect, and ensuring high sealing stability.

[0021] Further as Figure 1 As shown, it is worth noting that a rubber sealing ring 9 is fixed on the side of the movable valve seat 3, and multiple rubber sealing rings 9 are provided; in actual operation, the multiple rubber sealing rings 9 are provided to further improve the overall sealing effect when the valve is closed.

[0022] This solution has the following working process: When the valve is in the closed position, under the control of the hydraulic system, hydraulic oil is input into the first delivery channel 10 through the first inlet valve 2. The hydraulic oil then enters the controllable valve seat chamber A12 through the first inlet valve 2 and the first delivery channel 10, thereby hydraulically pushing the movable valve seat 3 forward and pressing it tightly against the surface of the C-shaped ball 8, generating a sealing pressure and achieving valve closure and sealing. When the valve is open, under the control of the hydraulic system, hydraulic oil is input into the second delivery channel 11 through the second inlet valve 4. The hydraulic oil then enters the controllable valve seat chamber A12 through the second inlet valve 4 and the second delivery channel 11. Channel 11 enters the controllable valve seat chamber B13, thereby hydraulically pushing the movable valve seat 3 backward, causing the movable valve seat 3 to disengage from the spherical surface of the C-type ball 8. At this time, the valve is opened. By offsetting the center of rotation of the C-type ball 8 from the center of the movable valve seat 3 by a certain distance, the rotation radius of the C-type ball 8 is divided into long radius rotation and short radius rotation. The movement trajectory of the C-type ball 8 is a dual vector motion, namely rotation + translation. When closing, the short radius enters the movable valve seat 3 first. As the closing continues, the spherical rotation radius of the C-type ball 8 gradually increases, becoming tighter and tighter, thereby achieving forced sealing.

[0023] Further as Figure 1 As shown, it is worth noting that the valve body 5 is equipped with a valve stem 7 that controls the C-type ball 8, and the movable valve seat 3 is equipped with an upper support shaft 6 that provides auxiliary support for the C-type ball 8.

[0024] In summary: Under the control of the hydraulic system, hydraulic oil enters the controllable valve seat chamber A12 through the first inlet valve 2 and the first delivery channel 10, thereby hydraulically pushing the movable valve seat 3 forward and pressing it tightly against the surface of the C-shaped ball 8, generating a sealing pressure and achieving valve closure. When the valve is opened, under the control of the hydraulic system, hydraulic oil is input into the second delivery channel 11 through the second inlet valve 4. The hydraulic oil then enters the controllable valve seat chamber B13 through the second inlet valve 4 and the second delivery channel 11, thereby hydraulically pushing the movable valve seat 3 backward, allowing the movable valve seat 3 to close and seal. When valve seat 3 disengages from the surface of C-shaped ball 8, the valve is opened. The reciprocating movement of movable valve seat 3 is adjusted by hydraulic drive, thereby greatly reducing the friction between the sealing surfaces during the opening and closing of the valve, achieving near-zero friction during opening and closing. At the same time, the valve is always in a no-stroke operation, which greatly reduces the operating torque and greatly extends the life of the sealing surfaces. The movement of movable valve seat 3 and the opening and closing of the valve are controlled by PLC programming, so that movable valve seat 3 automatically retracts before the valve is opened and automatically moves forward to seal after the valve is closed.

Claims

1. A differential pressure metal hard-seal C-type ball valve comprising a valve body (5), characterized in that, The end of the valve body (5) is fixed with a valve cover (1), the inside of the valve cover (1) is provided with a movable valve seat (3) which can be adjusted, the inside of the valve body (5) is provided with a C-shaped ball (8) which is open and closed with the movable valve seat (3), the inside of the valve cover (1) is provided with a first liquid channel (10) and a second liquid channel (11), the inside of the valve cover (1) is provided with a controllable valve seat chamber A (12) and a controllable valve seat chamber B (13) which are communicated with the first liquid channel (10) and the second liquid channel (11) respectively, the end of the first liquid channel (10) and the second liquid channel (11) is provided with a first liquid inlet valve (2) and a second liquid inlet valve (4) respectively, the movable valve seat (3) is adjusted by hydraulic control and reciprocating movement along the pipeline axis direction.

2. The differential pressure metal hard-seat C-type ball valve according to claim 1, wherein, The sealing surface of the movable valve seat (3) is coated with a coating, and the coating spraying thickness is greater than 0.3mm.

3. The differential pressure metal hard seat C-type ball valve according to claim 1, wherein, The center of rotation of the C-shaped ball (8) is offset from the center of the movable valve seat (3) by a certain distance, so that the rotation radius of the C-shaped ball (8) is divided into long radius rotation and short radius rotation, when closed, the short radius enters the valve seat first, and the closer it is, the tighter it is, so as to realize forced sealing.

4. The differential pressure metal hard-seat C-type ball valve according to claim 3, wherein, The side of the movable valve seat (3) is fixed with a rubber sealing ring (9), and the rubber sealing ring (9) is provided with a plurality of.

5. The differential pressure metal hard seat C-type ball valve according to claim 1, wherein, The valve body (5) is provided with a valve rod (7) for controlling the C-shaped ball (8), and the movable valve seat (3) is provided with an upper support shaft (6) for auxiliary supporting the C-shaped ball (8).

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