Cast ball valve capable of conveniently controlling and adjusting flow

Abstract

A cast ball valve convenient to control and adjust flow comprises a valve braking assembly, a valve rod, a valve seat part, a ball valve and a valve body, the valve braking assembly comprises a driving rod, the upper end of the valve rod is fixedly connected with the driving rod, the ball valve comprises a ball body, the ball body is arranged in the valve body and comprises a spiral guide ball arranged at the upper end of the ball body, and a spiral groove is formed in the periphery of the lower end of the valve rod. Lifting connection between the spiral groove and the spiral guide ball is achieved through cooperation of the spiral groove and the spiral guide ball. The sealing part is fixedly connected to the valve body, the valve seat part is arranged on the ball body, and the valve seat part comprises a first valve seat and a second valve seat; when the valve is completely opened and closed, the left side of the ball makes contact with the sealing part at the P1 position, and the first valve seat, the second valve seat and the sealing part make contact with the P2 position and the P3 position respectively to form sealing fit. In the process from opening to closing of the valve, the ball body and the valve body are not in direct contact to form clearance fit. According to the cast ball valve convenient to control and adjust the flow, in the long-time opening and closing process of the valve, the valve seat and the sealing part do not make continuous contact.

Description

Technical Field

[0001] The invention relates to the field of ball valves, and in particular to a casting ball valve which is convenient for controlling and adjusting flow. Background Art

[0002] Cast ball valve is a type of ball valve. A ball valve is a valve that controls the flow and direction of fluid by rotating the ball. A cast ball valve is a ball valve whose valve body is manufactured by casting. Casting is a manufacturing method that pours liquid metal into a specific mold cavity, waits for the metal to cool and solidify, and then obtains a part (valve body) with the desired shape and size.

[0003] Ball valves are commonly used in the oil, gas and chemical industries to transport a variety of corrosive, toxic, high-temperature and high-pressure chemical media. For safety reasons, ball valves are often installed in places where it is difficult for personnel to directly operate; the traditional ball valve can achieve a relatively narrow range of effective flow regulation between the state of nearly fully closed and fully open. In addition, since the sealing part of the valve body and the valve seat of the ball are always connected, the valve seat and the sealing part of the traditional ball valve will continue to rub during the long-term opening and closing of the valve, which may cause damage to the valve seat, increase the torque of operating the ball valve or shorten the life of the ball valve.

[0004] Therefore, the present invention provides a cast ball valve which is convenient for controlling and adjusting flow rate and in which the valve seat and the sealing part do not continuously contact each other during the long-term opening and closing process of the valve. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a cast ball valve that is easy to control and adjust the flow rate and in which the valve seat and the sealing part will not be in continuous contact during the long-term opening and closing of the valve, thereby solving the problems in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: a cast ball valve for controlling and adjusting flow, comprising a valve brake assembly, a valve stem, a valve seat, a ball valve and a valve body, the valve brake assembly comprising a driving rod, the upper end of the valve stem and the driving rod are fixedly connected, the ball valve comprises a ball and a valve body, the ball is arranged in the valve body, the ball comprises a spiral guide ball arranged at the upper end of the ball, a spiral groove is arranged on the outer periphery of the lower end of the valve stem, and the lower end of the valve stem is connected to the lifting and lowering of the ball through the cooperation between the spiral groove and the spiral guide ball; the valve body also comprises a sealing part, the sealing part is fixedly connected to the valve body, the valve seat is arranged on the ball and rotates synchronously with the ball; the valve seat comprises a first valve seat and a second valve seat; when the valve is fully opened, the left opening of the ball is sealed with the sealing part; when the valve is fully closed, the first valve seat and the second valve seat are respectively sealed with the sealing part; when the valve is opened to closed, there is no direct contact between the ball and the valve body to form a clearance fit.

[0007] Preferably, the sphere further comprises a valve seat portion, the valve seat portion is mounted on the valve seat portion, and the valve seat portion comprises a first valve seat seating surface and a second valve seat seating surface, which are respectively arranged at the first valve seat and the second valve seat.

[0008] Preferably, the valve stem further comprises an annular groove, which is arranged on the outer periphery of the middle section of the valve stem, and a protrusion is provided on the annular groove to contact and cooperate with the compression spring detection assembly.

[0009] Preferably, the compression spring detection mechanism includes a rolling assembly, a slider, a guide push rod, a reset spring, a support seat, a shell and a pressure gauge, the rolling assembly includes a ball, a flange and a rolling groove, the ball protrudes from the rolling groove to approach the valve stem, the opening and closing of the protrusion contacts the ball so that the ball drives the slider to slide laterally in the sliding guide groove and compress the reset spring, and the reset spring rebounds to drive the slider to slide laterally in the sliding guide groove; the support seat is provided with a flow gap, the shell is provided with an air outlet, and the outer end of the air outlet is connected to the pressure gauge.

[0010] Preferably, the valve brake assembly is arranged above the valve stem, and includes an upper plate, a lower plate, a control element, a piston and a cylindrical guide rail. An elastic member and a top plug are arranged between the control element and the piston. The control element presses the elastic member through the top plug and drives the piston to move along the cylindrical guide rail between the upper plate and the lower plate to drive the drive rod and the valve stem to rise and fall.

[0011] Preferably, it further includes a second valve stem, which includes an elastic buffer, an end cover and a sealing member. The second valve stem is arranged at the lower end of the sphere and passes through the valve tube and the end cover. The end cover is fixedly connected to the bottom of the valve tube; the sealing member is arranged between the end cover and the second valve stem, and the elastic buffer member is sleeved on the outer periphery of the second valve stem, and the upper and lower ends are respectively fixedly connected to the upper end of the second valve stem and the sealing member.

[0012] Preferably, when the valve is fully opened, the left opening of the ball is in sealing cooperation with the sealing portion, and the right opening of the ball has no direct contact with the sealing portion, forming a clearance fit.

[0013] Preferably, it further comprises a first valve stem bracket and a second valve stem bracket, wherein the valve stem bracket is mounted on the outer surface of the valve stem and supports the height of the valve stem.

[0014] Preferably, the valve body further comprises a sealing seat portion, the sealing portion is fixedly mounted on the sealing seat portion, and the sealing seat portion comprises a first sealing seat surface and a second sealing seat surface.

[0015] Preferably, the valve stem bracket further comprises a first stuffing piece and a second stuffing piece, wherein the first stuffing piece is arranged in a groove at an upper end of the first valve stem bracket, and the second stuffing piece is arranged between the second valve stem bracket and the valve body.

[0016] The beneficial effects of the present invention are as follows: 1. When the valve brake assembly is driven, the ball valve rotates forward and reverse through the spiral guide groove connected to the end of the valve stem, thereby rising and falling, and performing a spiral motion, thereby achieving stable opening, and closing even under high pressure to control fluid flow and prevent fluid leakage; Second, the structural design of the ball valve of the present invention minimizes the flow of the medium through the curved portion on the surface of the ball, in addition to the main flow path of the medium through the opening set in the ball. Therefore, in terms of the flow control of the valve, the consideration of the flow of the medium formed by the flow path other than the main flow path is greatly reduced, thereby improving the reliability of the flow control; 3. The medium flows more smoothly when passing through the streamlined curved part of the sphere, thereby reducing the energy loss of the medium when passing through the ball valve; Fourth, in the present invention, the valve seat portion and the sealing portion are in contact only when the valve is closed, and when the valve is changed from a closed state to an open state, the valve seat portion and the sealing portion are separated. Therefore, when the ball valve is adjusted, the friction generated in the valve seat portion and the sealing portion and the torque of the ball unit operating the valve can be greatly reduced, and the service life of the valve can be extended; 5. The first and second packing members and the bellows are provided to prevent the medium from leaking through the gap between the outer surface of the valve tube and the close contact surface of the valve stem bracket during the opening and closing process of the ball valve, thereby enhancing the sealing performance.

[0017] 6. The set compression spring detection component can reflect the rotation amplitude of the ball during the opening and closing of the valve, so as to better adjust and control the flow of the medium.

[0018] 7. The second valve stem structure can reduce the impact of the medium on the ball during the flow of the medium, enhance the stability of the ball, and relieve the axial pressure on the ball when the valve stem moves downward, thereby increasing the service life of the valve stem and the ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0020] Figure 1 This is a schematic diagram of the structure of a ball valve in an open state that is convenient for controlling and adjusting flow rate according to the present invention; Figure 2 This is a schematic diagram of the structure of a ball valve in a closed state that is convenient for controlling and adjusting flow rate according to the present invention; Figure 3 for Figure 2 Exploded view of the main parts of the ball valve in the structure; Figure 4 for Figure 1 Sectional view of the structure in the AA direction; Figure 5 A cross-sectional view showing that the sphere is further rotated by a predetermined angle and is converted to an open state; Figure 6 for Figure 2 Sectional view of the structure in the BB direction; Figure 7 for Figure 1 Schematic diagram of the specific structure at A1 in the structure; Figure 8 for Figure 6 A schematic diagram of the enlarged structure at A3 in the structure; Fig. 9 for Figure 1 A schematic diagram of the specific structure at A2 in the structure; Fig.10 for Fig. 9 Schematic diagram of the enlarged structure at B1 in the structure; Fig.11 for Fig. 9 Schematic diagram of the enlarged structure at B2 in the structure.

[0021] In the figure: 10-valve brake assembly; 101-driving rod; 102-piston; 103-elastic member; 104-cylindrical guide; 105-upper plate; 105a-first port; 106-lower plate; 106a-second port; 107-driving rod limit ring; 108-top plug; 109-control element; 20-valve stem; 201-spiral groove; 202-annular groove; 203-valve stem shoulder; 204-bump; 30-first valve stem support; 301-first positioning portion; 302-second valve stem support; 303-second positioning portion; 304-first filler member; 305-second filler member; 40-ball valve; 401-ball; 402-spiral guide ball; 403-valve seat portion; 403a-first valve seat seat surface; 403b-second valve seat seat surface; 404-valve seat portion; 404a-first valve seat; 404a1-first valve seat fastening member; 404b-second valve seat; 404b1-second valve seat fastening member; 50-valve body; 501-first flange; 502-valve tube; 503-second flange; 504-sealing portion; 504a-first sealing portion; 504a1-first sealing fastener; 504b-second sealing portion; 504b1-second sealing fastener; 505-sealing seat portion; 505a-first sealing seat surface; 505b-second sealing seat surface; 60- bellows; 70-second valve stem; 701-elastic buffer; 702-end cover; 703-sealing member; 80-compression spring detection assembly; 801-rolling assembly; 801a-ball; 801b-flange; 801c-rolling groove; 802-slider; 803-guide push rod; 804-compression spring; 805-support seat; 806-flow gap; 807-air outlet; 808-housing; 809-barometer; 810-sliding guide groove; 811-flow channel; P1-first contact point; P2-second contact point; P3-third contact point; S1-first flow; S2-second flow. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0024] The directions and positions mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only directions or positions with reference to the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but are not intended to limit the scope of protection of the present invention.

[0025] Example: The present invention provides a ball valve that is easy to control and adjust flow, which is mainly used to minimize the fluid flow into the space outside the main flow path of the valve when the valve is opened. When the valve is opened and closed for a long time, the valve seat and the sealing part will not be in continuous contact.

[0026] See also Figure 1 and Figure 2In an embodiment of the present invention, a ball valve for controlling and adjusting flow includes a valve brake assembly 10, a valve stem 20, a valve stem bracket, a ball valve 40 and a valve body 50. The valve brake assembly 10 includes a drive rod 101, a piston 102, an elastic member 103, a cylindrical guide rail 104, an upper plate 105, a lower plate 106, a drive rod limiting ring 107, a top plug 108 and a control element 109. The upper end of the drive rod 101 passes through the lower plate 106 and is connected and fixed to the piston 102. The elastic member 103 and the top plug 108 are arranged between the control element 109 and the piston 102. The control element 109 presses the elastic member 103 through the top plug 108 and drives the piston 102 to move along the cylindrical guide rail 104 between the upper plate 105 and the lower plate 106, so as to drive the drive rod 101 to rise and fall. The drive rod limiting ring 107 is embedded in the lower plate 106 to limit the axial displacement of the drive rod 101. The lower end of the driving rod 101 is tightly connected with the upper end of the valve stem by means of threads. A valve stem bracket is sleeved on the outer periphery of the valve stem 20. The valve stem bracket includes a first valve stem bracket 30 and a second valve stem bracket 302. The upper end of the first valve stem bracket 30 is connected and fixed to the lower plate 106 of the valve brake assembly 10 by a group of studs. As for the number of a group of studs, a suitable number can be selected according to the actual size. No specific restriction is set here. Specifically, in the present embodiment, one group is two. The first valve stem bracket 30 includes a first positioning portion 301. The first and second valve stem brackets form a limiting fit through the first positioning portion 301. The second valve stem bracket 302 includes a second positioning bracket 303. The lower end of the second valve stem bracket 303 is limitedly connected to the valve body 50 through the second positioning bracket 303. The ball valve 40 is arranged inside the valve body 50, and the lower end of the valve stem 20 is connected to the upper end of the ball valve 40.

[0027] Specifically, the valve brake assembly 10 moves downward through the control element 109, compressing the elastic member 103 to make the piston 102 threadedly connected to the drive rod 101 slide along the cylindrical guide rail 104 fixed between the upper plate 105 and the lower plate 106, driving the drive rod 101 to move axially, and at the same time controlling the valve stem 20 connected to the drive rod 101 to move axially, so as to achieve the purpose of switching the valve. As for the control method of the control element 109, it can be a switch control type, a sensor type or an actuator type, etc., and there is no specific limitation here. Specifically in this embodiment, , the control element 109 is an actuator type control element. In addition, the piston 102 divides the valve brake assembly 10 into two upper and lower chambers. The upper plate 105 and the lower plate 106 are both provided with a first port 105a and a second port 106a. The two chambers can also be connected to the outside through the first and second ports to form pneumatic or hydraulic pressure to achieve valve braking; the valve stem 20 also includes an annular groove 202 provided on the outer periphery of the valve stem 20, and a group of staggered compression spring detection components 80 are provided on the first valve stem bracket 30, and extend into it to cooperate with the annular groove 202, such as Figure 1 When the valve stem 20 moves downward to open the valve, the upper end of the annular groove 202 contacts the compression spring detection assembly 80. Figure 2 When the valve stem 20 moves upward to close the valve, the lower end of the annular groove 202 contacts the compression spring detection assembly 80. In this process, the compression spring detection assembly 80 abuts against the annular groove 202 to limit the stroke of the valve stem 20. A seat groove is formed at the upper end of the first valve stem bracket 30, and a normally sealed first stuffing piece 304 is provided in the seat groove to prevent the medium in the valve from leaking through the gap between the upper part of the valve stem 20 and the valve stem bracket; a second stuffing piece 303 is provided at the contact between the lower end of the second valve stem bracket 302 and the valve body 50, which prevents the medium in the valve from leaking through the gap between the outer surface of the gas pipe 23 and the close contact surface of the second valve stem bracket 302 when the ball valve 20 is switched to the open mode; in addition, a bellows 60 is also provided between the second valve stem bracket 302 and the valve stem 20, and the bellows 60 is sleeved on the outer periphery of the valve stem 20, with the upper end fixed between the first and second valve stem brackets, and the lower end connected and fixed to the valve stem 20.

[0028] See also Figure 3The ball valve 40 includes a ball 401, a spiral guide ball 402, a valve seat portion 403 and a valve seat portion 404. The valve body 50 includes a first flange 501, a valve tube 502, a second flange 503, a sealing portion 504 and a sealing seat portion 505. The ball 401 is provided with an opening coaxially with the valve body 50. A group of spiral guide balls 402 are provided on the inner wall of the upper port of the ball 401. The valve stem 20 also includes a spiral groove 201 and a valve stem shoulder 203 provided at the lower end. The ball 401 also includes a valve seat portion 403 vertically arranged with the ball opening. The ball valve 40 also includes a valve seat portion 404. The valve seat portion 404 includes a first valve seat 404a and a second valve seat 404b, and the first and second valve seats are fixedly mounted on the first valve seat seating surface 403a and the second valve seat seating surface 403b respectively by a plurality of screws. The valve body is provided with a sealing seat portion 505, and the sealing seat portion 505 includes a first sealing seat surface 505a and a second sealing seat surface 505b, which are respectively arranged on the first and second flanges. The valve body 50 also includes a sealing portion 504, and the sealing portion 504 includes a first sealing portion 504a and a second sealing portion 504b. The first and second sealing portions are fixedly mounted on the first and second sealing seat surfaces by a plurality of screws.

[0029] Specifically, the ball 401 is coupled with the spiral groove 201 through the spiral guide ball 402 to achieve connection with the valve stem 20. When the valve brake 10 is driven, the valve stem 20 moves axially through the driving rod 101. When the rise and fall of the valve stem 20 is converted into the rotational movement of the ball 401, the ball 401 can be rotated by a predetermined angle in the forward or reverse direction to achieve the opening and closing of the valve. The valve seat portion 404 is fixedly mounted on the valve seat seating portion 403 of the ball 401 and can rotate with the ball 401. When the valve is closed, the valve seat seating portion 403 of the ball 401 is in a coaxial position with the valve body 50. At this time, the valve seat portion 404 is in close contact with the sealing portion 504. During the valve opening process, the ball 401 rotates driven by the valve stem 20, and the valve seat portion 404 rotates together with it, and gradually separates from the sealing portion 504 to the coaxial position between the opening side of the ball 401 and the valve body 50, and the valve is opened.

[0030] See also Figures 4 to 6 and Figure 8The first and second valve seats are fixed to the first valve seat seating surface 403a and the second valve seat seating surface 403b on the ball 401 by the first valve seat fastening component 404a1 and the second valve seat fastening component 404b1 respectively, and the first and second sealing parts are fixed to the first sealing seat surface 505a and the second sealing seat surface 505b of the valve body 50 by the first sealing fastener 504a1 and the second sealing fastener 504b1 respectively; when the valve is fully opened, the ball 401 abuts against the first sealing part 504a to form a first contact point P1, and in the process of the valve from opening to closing (or closing to opening), the main flow of the medium flowing into the valve through the opening of the ball 401 is the first flow S1, and the flow flowing between the ball and the valve body is the second flow S2, and when the valve is fully closed, the first valve seat 404a abuts against the first sealing part 504a, and the second valve seat 404b abuts against the second sealing part 504b, respectively forming a second contact point P3 and a third contact point P2.

[0031] Specifically, when the valve is fully opened, the left side of the ball 401 is in close contact with the first sealing seat 504a on the first flange 501 to form a P1 contact point, and a gap is left between the right side and the second sealing seat 504b on the second flange 503, so that a passage is completely formed, and the medium flows into the ball valve from the first flange 501; when the valve is switched to a closed state, according to the structural design of the ball 401, in addition to the main flow path through the opening in the ball 401, the space through which the medium can flow is the space between the curved part of the ball 401 and the valve body 50, and this space is formed by a certain gap between the ball 401 and the valve body 50 during the rotation process, and this space can be minimized by flow rate, such as Figure 5 As shown, during the rotation of the ball 401, there is always a distance L1 between the farthest end of the valve seat on the ball and the center of the ball and the valve body 50, and there is always a distance L2 between the outer surface of the ball 401 and the center of the ball and the sealing part 504. Therefore, in terms of the flow control of the valve, in addition to the first flow S1 through the main flow path, the second flow S2 formed through the flow path must also be considered. The flow outside the main flow path is greatly reduced, and the reliability of flow control can be further improved. In addition, when the fluid passes through the streamlined curved part, it can flow more smoothly, reducing the friction loss of the fluid through the ball 401, thereby reducing the energy loss of the fluid through the ball 401; when the valve is completely closed, the first valve seat 404a and the second valve seat 404b are in close contact with the first sealing part 504a and the second sealing part 504b respectively, forming a third contact point P3 and a second contact point P2, completely blocking the medium.

[0032] See also Figure 7The second valve stem 70 includes an elastic buffer 701, an end cover 702 and a sealing member 703. The upper end of the second valve stem 70 is fixedly connected to the lower end of the ball 401, and the two are coaxially arranged. The diameter of the two end parts of the second valve stem 70 is greater than the diameter of the middle part. The middle part of the second valve stem 70 passes through the valve tube 502 and the end cover 702, and its lower end is limitedly matched with the end cover 702. The sealing member 703 is arranged between the end cover 702 and the second valve stem 70. The elastic buffer 701 is sleeved on the outer periphery of the middle part of the second valve stem 70, and the upper and lower ends are respectively abutted against the upper end of the second valve stem 70 and the sealing member 703. The end cover 702 is fixedly connected to the valve tube 502 by bolts.

[0033] Specifically, when the valve stem 20 moves downward and drives the ball 401 to rotate, even if the linear motion of the valve stem 20 is converted into the rotation of the ball 401 in this process, the valve stem 20 will exert a downward force on the ball 401 when it moves downward. When the ball 401 rotates, the downward force exerted by the valve stem 20 on the ball 401 drives the second valve stem 70 to slide downward in the end cover 702 along the direction of the force and compress the elastic buffer 701. When the ball 401 stops rotating, the second valve stem 70 is reset by the elastic force generated by the compression of the elastic buffer 701, and the ball 401 is stable. When the valve stem 20 drives the ball 401 to rotate to Figure 5 In the position shown, when the medium quickly flows into the ball valve, an impact force is generated on the ball 401 , and the second valve stem 70 serves to stabilize the ball 401 .

[0034] See also Figures 9 to 11 The compression spring detection assembly 80 is staggered up and down and arranged on both sides of the first valve stem bracket 30. The compression spring detection assembly 80 includes a rolling assembly 801, a slider 802, a guide push rod 803, a compression spring 804, a support seat 805, a shell 808, a barometer 809, a sliding guide groove 810 and a flow passage 811. The rolling assembly 801 includes a ball 801a, a flange 801b and a rolling groove 801c. The ball 801a is arranged on the side of the slider 802 close to the valve stem 20, and is limited in the rolling groove 801c by the flange 801b, and a part of it protrudes out of the shell. The body 808, the guide push rod 803 and the compression spring 804 are coaxially sleeved on one end of the slider 802 close to the sliding guide groove 810, the inner diameter of the flow channel 811 is equivalent to the outer diameter of the guide push rod 803, and the guide push rod 803 can slide laterally in the flow channel 811; the inner end of the support seat 805 extends into the flow channel 811, and the support seat 805 is provided with a flow gap 806 connected to the flow channel 811, and the shell 808 is provided with an air outlet 807 connected to the flow gap 806, and the outer end of the air outlet 807 is connected to the pressure gauge 809.

[0035] Specifically, Fig.10 and Fig.11 When the valve is fully opened, the state of the compression spring detection assembly 80 on the left side is as described in B1, the protrusion 204 abuts against the ball 801a, driving the slider 802 to slide leftward in the sliding guide groove 810, compressing the compression spring 804, and the guide push rod 803 slides leftward in the flow channel 811, pushing the gas in the flow channel 811 along the flow gap 806 to the air outlet 807, so that the pressure gauge 809 displays a value, and the value is displayed as the maximum value at this time; the state of the compression spring detection assembly 80 on the right side is as described in B2, at this time, the protrusion 204 is separated from the ball 801a, the slider 802 and the guide push rod 803 are both in the initial position, the gas in the flow channel 811 is saturated, and no gas is compressed to the air outlet 807 through the flow gap 806. At this time, the pressure gauge 80 9 is the minimum value, that is, 0, and at this time, the upper end of the annular groove 202 abuts against the upper end of the shell 808 to form a limit; when the valve is turned from fully open to fully closed, that is, when the ball 401 rotates from 90° to 0° (or 0° to 90°), the middle value is taken, that is, when the ball 401 rotates to 45°, the valve stem 20 moves upward, the protrusion 204 separates from the left ball 801a, and the value of the barometer 809 is the minimum value, that is, 0; the protrusion abuts against the ball 801a on the right, and the value of the barometer 809 is the maximum value; when the valve is fully closed, the valve stem 20 moves upward until the protrusion 204 is separated from the left and right balls, and all components in the left and right compression spring detection assemblies are in the initial position, so the values ​​of the barometers are all minimum values, that is, 0.

[0036] When the valve turns from fully open to fully closed (or fully closed to fully open), that is, the ball 401 turns from 90° to 0° (or 0° to 90°), the specific position of the rotation of the ball 401 can be judged according to the value of the barometer 809: when the value of the barometer on the left is the largest and the value of the barometer on the right is 0, the ball 401 is 90°, that is, the valve is fully open; when the value of the barometer on the left gradually changes from the maximum value to 0, and the value of the barometer on the right gradually changes from 0 to the maximum value, the ball 401 gradually turns from 90° to 45°; when the value of the barometer on the right gradually changes from the maximum value to 0 and the value of the barometer on the left is always 0, the ball gradually turns from 45° to 0°, and the valve is fully closed; therefore, the rotation amplitude of the ball 401 can be adjusted according to the value of the barometer 809 to control the circulation of the medium.

[0037] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A cast ball valve for controlling and adjusting flow, comprising a valve brake assembly (10), a valve stem (20), a valve seat portion (404), a ball valve (40) and a valve body (50), wherein the valve brake assembly (10) comprises a drive rod (101), the upper end of the valve stem (20) and the drive rod (101) are fixedly connected, the ball valve (40) comprises a ball body (401), and the ball body (401) is arranged in the valve body (50), characterized in that: The sphere (401) comprises a spiral guide ball (402) arranged at the upper end of the sphere (401); a spiral groove (201) is arranged on the outer periphery of the lower end of the valve stem (20); the lower end of the valve stem (20) is connected to the sphere (401) in a lifting manner through the cooperation between the spiral groove (201) and the spiral guide ball (402); the valve body (50) further comprises a sealing portion (504), the sealing portion (504) is fixedly connected to the valve body (50); the valve seat portion (404) is arranged on the sphere (401); The valve seat portion (404) rotates synchronously with the ball (401), and includes a first valve seat (404a) and a second valve seat (404b); when the valve is fully opened, the left opening of the ball (401) is sealed and matched with the sealing portion (504); when the valve is fully closed, the first valve seat (404a) and the second valve seat (404b) are respectively sealed and matched with the sealing portion (504); when the valve is in the process of opening and closing, there is no direct contact between the ball (401) and the valve body (50), and a clearance fit is formed.

2. A cast ball valve for easy flow control and regulation according to claim 1, characterized in that: The ball valve (40) further comprises a valve seat seating portion (403), the valve seat portion (404) being mounted on the valve seat seating portion (403), the valve seat seating portion (403) comprising a first valve seat seating surface (403a) and a second valve seat seating surface (403b), which are respectively arranged at the first valve seat (404a) and the second valve seat (404b).

3. A cast ball valve for easy flow control and regulation according to claim 1, characterized in that: The valve stem (20) further comprises an annular groove (202), the annular groove (202) being arranged on the outer periphery of the middle section of the valve stem (20), and a protrusion (204) being provided on the annular groove (202) for contacting and cooperating with the compression spring detection assembly (80).

4. A cast ball valve for convenient flow control and regulation according to claim 3, characterized in that: The compression spring detection mechanism (80) comprises a rolling assembly (801), a slider (802), a guide push rod (803), a return spring (804), a support seat (805), a housing (808) and a pressure gauge (809). The rolling assembly (801) comprises a ball (801a), a flange (801b) and a rolling groove (801c). The ball (801a) protrudes from the rolling groove (801c) to be close to the valve stem (20). The protrusion (204) opens and closes the ball to abut against the rolling assembly. The ball (801a) causes the ball (801a) to drive the slider (802) to slide laterally in the sliding guide groove (810) and compress the return spring (804), and the return spring (804) rebounds to drive the slider (802) to slide laterally in the sliding guide groove (810); the support seat (805) is provided with a flow gap (806), the shell (808) is provided with an air outlet (807), and the outer end of the air outlet (807) is connected to the pressure gauge (809).

5. A cast ball valve for convenient flow control and regulation according to claim 1, characterized in that: The valve brake assembly (10) is arranged above the valve stem (20), and comprises an upper plate (105), a lower plate (106), a control element (109), a piston (102) and a cylindrical guide rail (104). An elastic member (103) and a top plug (108) are arranged between the control element (109) and the piston (102). The control element (109) presses the elastic member (103) through the top plug (108) and drives the piston (102) to move along the cylindrical guide rail (104) between the upper plate (105) and the lower plate (106), so as to drive the driving rod (101) and the valve stem (20) to rise and fall.

6. A cast ball valve for controlling and adjusting flow according to claim 1, characterized in that: It also includes a second valve stem (70), the second valve stem (70) includes an elastic buffer (701), an end cover (702) and a sealing member (703), the second valve stem (70) is arranged at the lower end of the sphere (401), and passes through the valve tube (502) and the end cover (702), and the end cover (702) is fixedly connected to the bottom of the valve tube (502); the sealing member (703) is arranged between the end cover (702) and the second valve stem (70), the elastic buffer (701) is sleeved on the outer periphery of the second valve stem (70), and the upper and lower ends are respectively fixedly connected to the upper end of the second valve stem (70) and the sealing member (703).

7. A cast ball valve for convenient flow control and regulation according to claim 1, characterized in that: When the valve is fully opened, the left opening of the ball (401) is in sealing cooperation with the sealing portion (504), and the right opening of the ball (401) has no direct contact with the sealing portion (504), forming a clearance cooperation.

8. A cast ball valve for convenient flow control and regulation according to claim 1, characterized in that: It also includes a first valve stem support (30) and a second valve stem support (302), wherein the valve stem support is installed on the outer surface of the valve stem (20) and supports the height around the valve stem (20).

9. A cast ball valve for convenient flow control and regulation according to claim 8, characterized in that: The valve body (50) further comprises a sealing seat portion (505), the sealing portion (504) is fixedly mounted on the sealing seat portion (505), and the sealing seat portion (505) comprises a first sealing seat surface (505a) and a second sealing seat surface (505b).

10. A cast ball valve for convenient flow control and regulation according to claim 8, characterized in that: The valve stem support further comprises a first stuffing piece (304) and a second stuffing piece (305), wherein the first stuffing piece (304) is arranged in a groove at an upper end of the first valve stem support (30), and the second stuffing piece (305) is arranged between the second valve stem support (302) and the valve body (50).

Images