Zero-leakage full-sealing corrugated pipe rotary valve
By designing a multi-stage sealing structure and using a zero-leakage, fully sealed bellows rotary valve made of PTFE material, the leakage problem of bellows valves under high sealing requirements has been solved, achieving zero leakage and extended service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-22
- Publication Date
- 2026-03-13
AI Technical Summary
Existing bellows valves pose a risk of leakage under high sealing requirements, especially in the case of toxic media, where their safety and reliability are insufficient.
A zero-leakage, fully sealed bellows rotary valve was designed, employing a multi-stage sealing structure, including a packing section seal at the upper shaft and a bellows seal. The bellows is subjected to constant force to avoid alternating stress. PTFE material is used to reduce the coefficient of friction, and a stable connection is achieved through cross roller bearings and bolt fixing.
It achieves a zero-leakage sealing effect, extends the service life of the bellows, and improves the safety and reliability of the valve.
Smart Images
Figure CN223991998U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve technology, specifically to a zero-leakage, fully sealed bellows rotary valve. Background Technology
[0002] A valve is a device used in fluid systems to control the direction, pressure, and flow rate of a fluid. Valves allow the media (liquid, gas, powder) within piping and equipment to flow or stop and control their flow rate.
[0003] Valves are control components in pipeline fluid transport systems. They are used to change the cross-sectional area of the passage and the direction of medium flow, and have functions such as guiding, stopping, throttling, checking, diverting, or overflowing and relieving pressure. Valves used for fluid control range from the simplest shut-off valves to various valves used in extremely complex automatic control systems. Their types and specifications are numerous, and their nominal diameters range from extremely small instrument valves to industrial pipeline valves with diameters up to 10 meters. Valves can be used to control the flow of various types of fluids, including water, steam, oil, gas, slurry, various corrosive media, liquid metals, and radioactive fluids. Valve operating pressures range from 0.0013 MPa to ultra-high pressures of 1000 MPa, and operating temperatures range from ultra-low temperatures of -270℃ to high temperatures of 1430℃. Valves can be controlled by various transmission methods, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic-hydraulic, electro-hydraulic, pneumatic-hydraulic, spur gear, bevel gear drive, etc. They can operate according to predetermined requirements under the action of pressure, temperature or other forms of sensor signals, or simply open or close without relying on sensor signals. Valves rely on drive or automatic mechanisms to make the opening and closing parts move up and down, slide, swing or rotate, thereby changing the size of their flow channel area to achieve their control function.
[0004] With the development of society and the rapid development of modern large-scale machinery, petroleum, chemical, new energy, nuclear industry and other industries, the requirements for the sealing reliability of valves are getting higher and higher. Bellows valves have zero leakage and have a broad market, and will surely be used extensively.
[0005] The research on valves that are not only easy to install and robust, but also economical, energy-saving, and environmentally friendly is particularly important. In existing technologies, bellows valves are commonly used in applications requiring high sealing or handling toxic media. However, bellows themselves are elastic, and bellows valves generally lack an upper sealing structure, leaving the bellows constantly under media pressure. The inherent danger and safety risks of this are self-evident. Summary of the Invention
[0006] The technical problem solved by this utility model is to provide a zero-leakage, fully sealed bellows rotary valve to solve the problems mentioned in the background art.
[0007] The technical problem solved by this utility model is achieved by the following technical solution: a zero-leakage fully sealed bellows rotary valve, including a valve seat, a centering shell installed on the upper part of the valve seat, an installation hole provided on the upper part of the centering shell, a stuffing box installed in the installation hole, a pressing block provided on the upper end of the stuffing box for pressing the stuffing box, a first central hole provided in the middle of the valve seat, an upper bushing installed on the top of the first central hole, a lower bushing installed on the bottom of the central hole, a pipe provided at the lower part of the valve seat, and a ball core provided in the middle of the pipe.
[0008] Furthermore, both the stuffing box and the clamping block are provided with a second central hole, and both the upper bushing and the lower bushing are provided with a third central hole.
[0009] Furthermore, an upper shaft is provided on the second central hole, the top of the upper shaft passes through the second central hole and is located outside the second central hole, a handle is provided at the top of the upper shaft, a step is provided at the upper end of the upper shaft, a PTFE gasket is installed on the step, and a limit block is provided on the upper part of the PTFE gasket.
[0010] Furthermore, the limiting block passes through the upper shaft and presses against the upper part of the PTFE pad, and is fixed to the centering shell by bolts.
[0011] Furthermore, the top of the upper shaft is connected to the upper end of the lower shaft via a cross roller bearing, and the lower end of the lower shaft passes through the third central hole and is inserted into the groove of the ball core.
[0012] Furthermore, a bellows is provided on the outside of the lower shaft. The bellows is a metal bellows with flanges at both ends. One end of the bellows is welded to the upper shaft 1, and the other end of the bellows is welded to the valve seat.
[0013] Furthermore, the lower shaft is curved in the middle, and both ends of the lower shaft are set as concentric cranks, with a flange provided at the end of the curved part of the lower shaft.
[0014] Furthermore, the flange support at the lower part of the lower shaft is located on the upper surface of the upper bushing.
[0015] Furthermore, a pressure gauge is installed on the side wall of the centering housing.
[0016] Furthermore, a sealing ring I is fixedly installed between the valve seat and the centering housing mating surface by bolt I, and a sealing ring II is fixedly installed between the valve seat and the upper mating surface of the pipeline by bolt II.
[0017] Furthermore, both the upper and lower bushings are made of PTFE material.
[0018] Compared with the prior art, the beneficial effects of this utility model are: the advantages of this utility model are simple structure, convenient use, and multi-level sealing. The first-level seal is the sealing of the packing part at the upper shaft, and the second-level seal is the sealing of the bellows. The bellows is subjected to constant force instead of alternating stress, thus extending the service life of the bellows. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of this utility model.
[0020] Figure 2 This is a schematic diagram of the upper shaft of this utility model.
[0021] In the diagram: 1-Upper shaft; 2-Bellwall; 3-Valve seat; 4-Upper bushing; 5-Stuffing gland; 6-Pipe; 7-Ball core; 8-Centering housing; 9-Clamping block; 10-Lower bushing; 11-Handle; 12-Limit block; 13-PTFE gasket; 14-Pressure gauge; 15-Lower shaft; 16-Cross roller bearing. Detailed Implementation
[0022] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection between the internal parts of two components.
[0023] like Figure 1 , Figure 2 As shown, a zero-leakage, fully sealed bellows rotary valve includes a valve seat 3. A centering shell 8 is mounted on the upper part of the valve seat 3. An installation hole is provided on the upper part of the centering shell 8. A stuffing box 5 is installed in the installation hole. A clamping block 9 is provided on the upper end of the stuffing box 5 for clamping the stuffing box 5. A first central hole is provided in the middle of the valve seat 3. An upper bushing 4 is installed on the top of the first central hole. A lower bushing 10 is installed on the bottom of the central hole. A pipe 6 is provided at the lower part of the valve seat 3. A ball core 7 is provided in the middle of the pipe 6.
[0024] Furthermore, both the stuffing box 5 and the clamping block 9 are provided with a second central hole, and both the upper bushing 4 and the lower bushing 10 are provided with a third central hole.
[0025] Furthermore, an upper shaft 1 is provided on the second central hole, and the top of the upper shaft 1 passes through the second central hole and is located outside the second central hole. A handle 11 is provided at the top of the upper shaft 1. Rotating the handle 11 by 90° will open and close the bellows rotary valve. A step is provided at the upper end of the upper shaft 1, and a PTFE gasket 13 is installed on the step. A limit block 12 is provided on the upper part of the PTFE gasket 13.
[0026] Furthermore, the limiting block 12 passes through the upper shaft 1 and presses against the upper part of the PTFE pad 13, and is fixed to the centering shell 8 by bolts.
[0027] Furthermore, the top of the upper shaft 1 is connected to the upper end of the lower shaft 15 via a cross roller bearing 16, and the lower end of the lower shaft 15 passes through the third central hole and is inserted into the groove of the ball core 7.
[0028] Furthermore, a bellows 2 is provided on the outside of the lower shaft 15. The bellows 2 is a metal bellows with flanges at both ends. One end of the bellows 2 is welded to the upper shaft 1, and the other end of the bellows 2 is welded to the valve seat 3.
[0029] Furthermore, the lower shaft 15 is curved in the middle, and both ends of the lower shaft 15 are set as concentric cranks. The ends of the curved part of the lower shaft 15 are provided with flanges, and the flanges at the lower part of the lower shaft 15 are supported on the upper surface of the upper bushing 4.
[0030] Furthermore, a pressure gauge 14 is installed on the side wall of the centering shell 8 to provide real-time feedback on the internal pressure of the shell and to observe whether there is any leakage inside.
[0031] Furthermore, a sealing ring I is fixedly installed between the valve seat 3 and the centering housing 8 by bolt I, and a sealing ring II is fixedly installed between the valve seat 3 and the upper mating surface of the pipe 6 by bolt II.
[0032] Furthermore, both the upper bushing 4 and the lower bushing 10 are made of PTFE material to reduce the coefficient of friction.
[0033] This utility model discloses a zero-leakage bellows rotary valve, comprising an upper shaft 1, a bellows 2, a valve seat 3, an upper bushing 4, a stuffing box 5, a pipe 6, a ball core 7, a centering housing 8, a clamping block 9, a lower bushing 10, a handle 11, a limit block 12, a PTFE gasket 13, and a pressure gauge 14. The centering housing 8 is mounted on the upper part of the valve seat 3, and the valve seat 3 is installed on the upper part of the pipe 6. The lower part of the lower shaft 15 is inserted into the groove of the ball core 7. The upper bushing 4 is installed at the top of the center hole of the valve seat 3, and the lower bushing 10 is installed at the bottom of the center hole of the valve seat 3. The lower end of the lower shaft 15 is inserted into the center holes of the upper bushing 4 and the lower bushing 10. The pressure gauge 14 is installed on the side wall of the centering housing 8, providing real-time feedback on the pressure inside the housing.
[0034] The lower shaft 15 is curved and has concentric ends, resembling a crank. The curved part has a flange at one end.
[0035] Bellows 2 is a bellows with flanges at both ends. One end is welded to the upper shaft 1 as a whole. The other end is welded to the valve seat 3 as a whole.
[0036] The stuffing box 5 is installed in the hole in the upper part of the centering housing 8. It is tightened with the clamping block 9. The top of the upper shaft 1 passes through the center hole of the stuffing box 5 and the clamping block 9. The handle 11 is installed at the top of the upper shaft 1.
[0037] A PTFE pad 13 is installed at the upper step of the upper shaft 1. The limiting block 12 passes through the upper shaft 1 and presses against the upper part of the PTFE pad 13, and is fixed to the centering housing 8 with bolts.
[0038] The advantages of this utility model are its simple structure, ease of use, and multi-stage sealing. The first stage of sealing is the sealing of the packing part at the upper shaft, and the second stage of sealing is the sealing of the bellows. The bellows is subjected to constant force instead of alternating stress, thus extending the service life of the bellows.
[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A zero-leakage, fully-sealed bellows rotary valve comprising a valve seat (3), characterized in that: The upper part of the valve seat (3) is provided with a centering shell (8), the upper part of the centering shell (8) is provided with a mounting hole, the mounting hole is provided with a packing gland (5), the upper end of the packing gland (5) is provided with a pressing block (9), the middle of the valve seat (3) is provided with a first center hole, the top of the first center hole is provided with an upper bushing (4), the bottom of the center hole is provided with a lower bushing (10), the lower part of the valve seat (3) is provided with a pipeline (6), and the middle of the pipeline (6) is provided with a ball core (7).
2. A zero-leak, fully-sealed bellows rotary valve as in claim 1, wherein: The packing gland (5) and the pressing block (9) are provided with a second center hole, and the upper bushing (4) and the lower bushing (10) are provided with a third center hole.
3. A zero-leak, fully-sealed bellows rotary valve as defined in claim 2, wherein: The second center hole is provided with an upper shaft (1), the top of the upper shaft (1) penetrates the second center hole and is arranged outside the second center hole, the top end of the upper shaft (1) is provided with a handle (11), the upper end of the upper shaft (1) is provided with a step, the step is provided with a fluorine pad (13), and the upper part of the fluorine pad (13) is provided with a limiting block (12).
4. A zero-leak, fully-sealed bellows rotary valve as defined in claim 3, wherein: The limiting block (12) is pressed on the upper part of the fluorine pad (13) through the upper shaft (1) and is fixedly connected with the centering shell (8) through bolts.
5. A zero-leak, fully-sealed bellows rotary valve as defined in claim 3, wherein: The top of the upper shaft (1) is connected and arranged with the upper end of a lower shaft (15) through a cross roller bearing (16), and the lower end of the lower shaft (15) penetrates the third center hole and is inserted into a groove of the ball core (7).
6. A zero-leak, fully-sealed bellows rotary valve as defined in claim 5, wherein: The lower shaft (15) is provided with a bellows (2) outside, the bellows (2) is a metal bellows with flanges at both ends, one end of the bellows (2) is welded with the upper shaft (1) in an integrated manner, and the other end of the bellows (2) is welded with the valve seat (3) in an integrated manner.
7. A zero-leak, fully-sealed bellows rotary valve as in claim 6, wherein: The lower shaft (15) is curved in the middle, the two ends of the lower shaft (15) are provided in a concentric crank shape, the end of the curved part of the lower shaft (15) is provided with a flange plate, and the flange plate at the lower part of the lower shaft (15) is supported on the upper surface of the upper bushing (4).
8. A zero-leak, fully-sealed bellows rotary valve as in claim 1, wherein: The side wall of the centering shell (8) is provided with a pressure gauge (14).
9. A zero-leak, fully-sealed bellows rotary valve as in claim 1, wherein: The combination surface between the valve seat (3) and the centering shell (8) is fixedly provided with a sealing ring I through bolts I, and the combination surface between the upper part of the valve seat (3) and the pipeline (6) is fixedly provided with a sealing ring II through bolts II.
10. A zero-leak, fully-sealed bellows rotary valve as defined in claim 1, wherein: The upper bushing (4) and the lower bushing (10) are made of fluorine material.