An electric vacuum regulating valve for uranium enrichment plants

Abstract

The present invention belongs to the technical field of uranium enrichment process, and specifically discloses an electric vacuum regulating valve for a uranium enrichment plant, comprising a valve body, a valve core, a valve stem, a bellows, a bellows welding plate, an actuator, a bracket and a middle flange; the valve core and the bellows are located in the valve body, the valve core is connected to the inner surface of the valve body, the bellows is located above the valve core, and the bellows is fixedly connected to the valve core; the middle flange is located above the valve body, and the middle flange is fixedly connected to the valve body; the bellows welding plate is located between the middle flange and the valve body and above the bellows, and the bellows welding plate is fixedly connected to the bellows; the bracket is located above the middle flange, and the bracket is fixedly connected to the middle flange; the actuator is located above the bracket, and the actuator is fixedly connected to the bracket; the valve stem is located inside the bellows, the top of the valve stem extends to the internal through hole of the bracket, and the bottom of the valve stem is located in the opening of the valve core. The present invention has good sealing performance and high adjustment accuracy, and can perform medium leakage detection.

Description

Technical Field

[0001] The invention belongs to the technical field of uranium enrichment process, and in particular relates to an electric vacuum regulating valve used in a uranium enrichment plant. Background Art

[0002] Driven by the actuator, the electric vacuum regulating valve changes the flow area between the valve core and the valve seat to achieve the purpose of regulating the medium flow and stabilizing the pressure behind the valve.

[0003] The existing vacuum regulating valve stem and valve core are directly connected by threads, which requires extremely high machining accuracy of the stem and valve core. The valve core is prone to positional deviation when in contact with the valve seat, resulting in poor sealing performance when the valve is closed.

[0004] Moreover, the conventional bellows structure has a large heat dissipation area, which can easily cause the material temperature to drop and cause condensation and crystallization, which is not conducive to the normal operation of the bellows and the smooth transportation of the medium.

[0005] At the same time, the vacuum regulating valve needs to set the minimum flow capacity of the valve under various complex working conditions during operation. Currently, there is no valve that can adjust the minimum flow capacity.

[0006] In addition, the life of the bellows is closely related to its compression. The compression range of the bellows of the bellows valve currently used has been determined at the beginning of the design and cannot be changed. This cannot adapt to the changing working conditions on the uranium enrichment process pipeline;

[0007] Finally, the reliability of the bellows in the uranium enrichment process pipeline is crucial. When conducting the bellows life test in the early stage, it is necessary to be able to detect the medium leakage when the bellows ruptures. However, there is currently no vacuum regulating valve that can conduct leak detection in a timely and convenient manner during the life test.

[0008] Therefore, it is urgent to develop an electric vacuum regulating valve for uranium enrichment plants that can effectively overcome the above technical problems. Summary of the invention

[0009] The object of the present invention is to provide an electric vacuum regulating valve for a uranium enrichment plant, which can meet the internal sealing requirements of the valve channel and the external sealing requirements of the valve under the uranium enrichment process, has high regulating accuracy, and can detect the rupture and leakage of the bellows during the valve life test.

[0010] The technical solution to achieve the purpose of the present invention is:

[0011] An electric vacuum regulating valve for a uranium enrichment plant, the electric vacuum regulating valve comprising: a valve body, a valve core, a valve stem, a bellows, a bellows welding plate, an actuator, a bracket and a middle flange; the valve core and the bellows are both located in the valve body, the valve core is connected to the inner surface of the valve body, the bellows is located above the valve core, and the bellows is fixedly connected to the valve core; the middle flange is located above the valve body, and the middle flange is fixedly connected to the valve body; the bellows welding plate is located between the middle flange and the valve body and above the bellows, and the bellows welding plate is fixedly connected to the bellows; the bracket is located above the middle flange, and the bracket is fixedly connected to the middle flange; the actuator is located above the bracket, and the actuator is fixedly connected to the bracket; the valve stem is located inside the bellows, the top of the valve stem extends to the internal through hole of the bracket, and the bottom of the valve stem is located in the opening of the valve core.

[0012] Furthermore, the bellows is fixedly connected to the valve core by welding, and the bellows welding plate is fixedly connected to the bellows by welding.

[0013] Furthermore, the electric vacuum regulating valve also includes: an adaptive connecting ball head, a disc spring and a locking nut, the adaptive connecting ball head is located below the valve stem, the adaptive connecting ball head is fixedly connected to the valve stem, the locking nut is sleeved on the valve stem and located above the valve core, and the locking nut is fixedly connected to the valve stem and the valve core respectively; the disc spring is sleeved on the valve stem and located between the locking nut and the adaptive connecting ball head, and the disc spring is respectively engaged and connected with the locking nut and the adaptive connecting ball head.

[0014] Furthermore, the adaptive connecting ball head is fixedly connected to the valve stem via threads, and the locking nut is fixedly connected to the valve stem and the valve core via threads respectively.

[0015] Furthermore, the electric vacuum regulating valve also includes: a valve position locking screw, a limit retaining ring, and a valve position adjusting nut. The limit retaining ring is clamped on the annular groove on the upper part of the valve stem, and the valve position adjusting nut is sleeved on the valve stem and is located below the limit retaining ring. The inner hole of the valve position adjusting nut and the valve stem are clearance-matched, and the valve position adjusting nut is movably connected to the bracket; the valve position locking screw passes through the side wall of the bracket, and the valve position locking screw is movably connected to the bracket, and the free end of the valve position locking screw is tightened against the valve position adjusting nut to lock the installation position of the valve position adjusting nut.

[0016] Furthermore, the electric vacuum regulating valve also includes: a valve position indicating rod, a valve position indicating plate, and a valve position indicating block. The valve position indicating plate has a valve position scale. The valve position indicating plate is fixedly installed in an indicating groove on the side wall of the bracket. The valve position indicating block is sleeved on the top end of the valve stem. The valve position indicating block is fixedly connected to the valve stem. The valve position indicating rod is located between the valve position indicating block and the bracket. One end of the valve position indicating rod is fixedly connected to the valve position indicating block, and the other end of the valve position indicating rod extends to the middle position of the indicating groove on the side wall of the bracket.

[0017] Furthermore, the output shaft of the actuator is fixedly connected to the valve stem and the valve position indicating block.

[0018] Furthermore, the electric vacuum regulating valve also includes: a lock nut and a locking nut, which are sequentially sleeved on the output shaft of the actuator from top to bottom, and the locking nut is located above the valve position indicating block. The lock nut and the locking nut are respectively movably connected to the output shaft of the actuator, the locking nut is engaged with the valve position indicating block, and the lock nut is engaged with the locking nut to lock the position of the valve position indicating block.

[0019] Furthermore, the electric vacuum regulating valve also includes: a leak detection plug and a leak detection hole. The leak detection hole is arranged on the outer periphery of the middle flange. The leak detection hole is connected to the annular hole at the bottom of the middle flange. The annular hole is through-connected to the inner cavity of the bellows. The leak detection plug matches the leak detection hole. The leak detection plug and the leak detection hole are detachably connected through a sealing thread.

[0020] Furthermore, the electric vacuum regulating valve also includes: a shaft sleeve baffle, a shaft sleeve, and a shaft sleeve. The shaft sleeve is sleeved on the valve stem and located on the internal boss of the middle flange. The shaft sleeve is sleeved on the valve stem and located in the shaft sleeve. The shaft sleeve baffle is located at the upper end of the shaft sleeve. The shaft sleeve baffle, the shaft sleeve and the middle flange are fixedly connected.

[0021] Furthermore, the electric vacuum regulating valve also includes: a large sealing ring, which is located between the middle flange and the valve body, and is respectively joined and connected to the middle flange and the valve body.

[0022] Furthermore, the electric vacuum regulating valve also includes: a sealing gasket, which is located between the bellows welding platen and the valve body, and the sealing gasket is respectively engaged and connected with the bellows welding platen and the valve body.

[0023] Furthermore, the electric vacuum regulating valve also includes: a small sealing ring, which is located between the bellows welding platen and the middle flange, and the small sealing ring is respectively engaged and connected with the bellows welding platen and the middle flange.

[0024] Furthermore, the electric vacuum regulating valve also includes: a valve stem sealing ring, which is located between the bottom of the valve stem and the middle flange, and the valve stem sealing ring is respectively engaged with the valve stem and the middle flange.

[0025] The beneficial technical effects of the present invention are:

[0026] 1. The electric vacuum regulating valve for a uranium enrichment plant provided by the present invention solves the external sealing requirement of the valve through the sealing connection between the bellows, the valve core and the bellows welding pressure plate, and meets the sealing requirement of the channel in the uranium hexafluoride medium through the adaptive valve core and valve seat sealing structure composed of the valve core, the adaptive connecting ball head, the disc spring, the locking nut and the valve stem.

[0027] 2. The electric vacuum regulating valve for uranium enrichment plants provided by the present invention reduces the heat dissipation area of ​​the valve through the built-in bellows sealing structure composed of a valve body, a valve core, a bellows, a sealing gasket, a large sealing ring, a small sealing ring and a bellows welding plate, so that the uranium hexafluoride medium in the valve maintains a certain temperature and does not condense into a solid state in the gap of the bellows to cause the bellows to deform and leak. At the same time, this structure makes the outer surface of the valve body easier to heat and insulate, effectively avoiding the problem that the conventional bellows valve has a high height in the axial direction of the valve stem, a large heat dissipation area and is difficult to achieve external valve wrapping and insulation.

[0028] 3. The electric vacuum regulating valve for uranium enrichment plant provided by the present invention can set the minimum valve opening K through the valve position adjustment structure composed of a limit retaining ring and a valve position adjustment nut. V value, meeting the requirements of the valve flow capacity under the uranium enrichment process.

[0029] 4. The electric vacuum regulating valve for uranium enrichment plant provided by the present invention realizes real-time indication of valve opening during operation through a valve position indication structure composed of a valve position indication rod, a valve position indication plate, and a valve position indication block. At the same time, the valve can adjust the compression range of the bellows by adjusting the position of the anti-loosening nut and the locking nut according to the different depths of the output shaft of the actuator screwed into the valve stem, so as to adapt to different internal pressure conditions.

[0030] 5. The electric vacuum regulating valve for a uranium enrichment plant provided by the present invention can detect medium leakage during the bellows life test through a bellows life test leak detection structure consisting of an annular hole, a leak detection hole and a leak detection plug opened on the middle flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of an electric vacuum regulating valve used in a uranium enrichment plant provided by the present invention;

[0032] Figure 2 This is a partial enlarged view of an adaptive valve core sealing structure in an electric vacuum regulating valve used in a uranium enrichment plant provided by the present invention;

[0033] Figure 3 This is a partial enlarged view of the sealing structure of a bellows assembly in an electric vacuum regulating valve used in a uranium enrichment plant provided by the present invention;

[0034] Figure 4 This is a partial enlarged view of the small screws, shaft sleeve baffle, shaft sleeve, and shaft sleeve of an electric vacuum regulating valve used in a uranium enrichment plant provided by the present invention.

[0035] In the figure: 1-valve body; 2-valve core; 3-adaptive connecting ball head; 4-disc spring; 5-locking nut; 6-valve stem; 7-bellows; 8-sealing gasket; 9-leak detection plug; 10-large sealing ring; 11-small sealing ring; 12-leak detection hole; 13-bellows welding pressure plate; 14-valve position locking screw; 15-valve position indicator rod; 16-valve position indicator plate; 17-actuator; 18-bracket; 19-locking screw; 20-anti-loosening nut; 21-locking nut; 22-valve position indicator block; 23-middle flange; 24-limit retaining ring; 25-valve body locking screw; 26-valve position adjustment nut; 27-small screw; 28-shaft sleeve baffle; 29-shaft sleeve; 30-shaft sleeve; 31-valve stem sealing ring. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0037] like Figure 1 As shown, the present invention provides an electric vacuum regulating valve for a uranium enrichment plant, comprising: a valve body 1, a valve core 2, an adaptive connecting ball head 3, a disc spring 4, a locking nut 5, a valve stem 6, a bellows 7, a sealing gasket 8, a leak detection plug 9, a large sealing ring 10, a small sealing ring 11, a leak detection hole 12, a bellows welding pressing plate 13, a valve position locking screw 14, a valve position indicating rod 15, a valve position indicating plate 16, an actuator 17, a bracket 18, a locking screw 19, a locking nut 20, a locking nut 21, a valve position indicating block 22, a middle flange 23, a limit retaining ring 24, a valve body locking screw 25, a valve position adjusting nut 26, a small screw 27, a shaft sleeve baffle 28, a shaft sleeve 29, a shaft sleeve 30 and a valve stem sealing ring 31.

[0038] like Figure 1 As shown, the valve core 2 is located in the lower recess of the valve body 1, and the conical surface of the valve core 2 is connected with the inner surface of the valve body 1; the bellows 7 is located in the valve body 1 and above the valve core 2, and the valve core 2 and the bottom end of the bellows 7 are fixedly connected by welding to achieve sealing; the middle flange 23 is located above the valve body 1, the bellows welding plate 13 is located between the middle flange 23 and the valve body 1 and above the bellows 7, and the bellows welding plate 13 and the top of the bellows 7 are fixedly connected by welding to achieve sealing; the middle flange 23 and the valve body 1 are fastened together by the valve body locking screws 25, and the bellows welding plate 13 is fixedly placed between the middle flange 23 and the valve body 1. The longitudinal section of the bracket 18 is an I-shaped, the bracket 18 is located above the middle flange 23, and the bracket 18 and the middle flange 23 are fastened together by the valve body locking screws 25. The actuator 17 is located above the bracket 18, and the actuator 17 and the bracket 18 are fixedly connected by the locking screws 19. The valve stem 6 is located inside the bellows 7 , the top of the valve stem 6 extends into the inner through hole of the bracket 18 , and the bottom of the valve stem 6 is located in the opening of the valve core 2 .

[0039] like Figure 2 As shown, the adaptive connection ball head 3 is a hemispherical shape with an opening facing upwards. The adaptive connection ball head 3 is located below the valve stem 6. The outer side of the bottom end of the valve stem 6 is provided with an external thread, and the inner side of the opening of the adaptive connection ball head 3 is provided with an internal thread. The valve stem 6 with an external thread is fastened to the adaptive connection ball head 3 with an internal thread through threads. The locking nut 5 is sleeved on the valve stem 6 and is located on the valve core 2; the inner side of the locking nut 5 is provided with an internal thread, and the locking nut 5 with an internal thread is fastened to the valve stem 6 with an external thread through threads; the outer side of the locking nut 5 is provided with an external thread, and the inner side of the opening of the valve core 2 is provided with an internal thread, and the locking nut 5 with an external thread is fastened to the valve core 2 with an internal thread through threads. A disc spring 4 is provided between the locking nut 5 and the adaptive connection ball head 3, and the disc spring 4 is sleeved on the valve stem 6. The disc spring 4 is respectively engaged and connected with the locking nut 5 and the adaptive connection ball head 3. The valve core 2, the adaptive connecting ball head 3, the disc spring 4, the locking nut 5 and the valve stem 6 form an adaptive sealing structure.

[0040] During the closing process of the valve, the valve core 2 can rotate along the contact point due to point contact with the adaptive connecting ball head 3, thereby eliminating the deviation of the valve stem 6 caused by machining and assembly processes during the closing process, so that the conical sealing surface of the valve core 2 is tightly fitted with the conical sealing surface in contact with the valve body 1, thereby achieving reliable sealing.

[0041] like Figure 3 As shown, a large sealing ring 10 is provided between the middle flange 23 and the valve body 1 , and the large sealing ring 10 is respectively joined and connected with the middle flange 23 and the valve body 1 to achieve sealing between the middle flange 23 and the valve body 1 .

[0042] A sealing gasket 8 is provided between the bellows welding plate 13 and the valve body 1 , and the sealing gasket 8 is respectively joined and connected to the bellows welding plate 13 and the valve body 1 to achieve sealing between the bellows welding plate 13 and the valve body 1 .

[0043] A small sealing ring 11 is provided between the bellows welding plate 13 and the middle flange 23. The small sealing ring 11 is respectively connected to the bellows welding plate 13 and the middle flange 23 to achieve sealing between the bellows welding plate 13 and the middle flange 23. Figure 3 As shown, the sealing gasket 8, the large sealing ring 10 and the small sealing ring 11 form a sealing structure of the bellows assembly.

[0044] like Figure 1 As shown, a stem sealing ring 31 is provided between the bottom of the valve stem 6 and the middle flange 23 , and the stem sealing ring 31 is respectively engaged and connected with the valve stem 6 and the middle flange 23 to achieve sealing between the valve stem 6 and the middle flange 23 .

[0045] The valve core 2, the bellows 7 and the bellows welding plate 13 are welded to form a new bellows assembly. The built-in bellows structure reduces the heat dissipation area of ​​the valve, making it difficult for the working medium to condense into a solid state in the gap of the bellows, thereby causing the bellows to deform and leak, and the outer surface of the valve body is easier to heat and insulate.

[0046] like Figure 1 As shown, the upper part of the valve stem 6 located in the internal through hole of the bracket 18 is processed with an annular groove, and the limit retaining ring 24 is an open elastic part, which is clamped on the annular groove of the valve stem 6. The valve position adjustment nut 26 is sleeved on the valve stem 6 and is located below the limit retaining ring 24. The inner hole of the valve position adjustment nut 26 and the valve stem 6 are clearance-matched. The lower outer side of the valve position adjustment nut 26 is provided with an external thread, and the inner side of the through hole of the bracket 18 is provided with an internal thread. The valve position adjustment nut 26 with an external thread is connected to the bracket 18 with an internal thread through a thread, and the valve position adjustment nut 26 can move up and down along the axial direction of the valve stem 6 by rotation. The valve position locking screw 14 passes through the side wall of the bracket 18 at the corresponding position on the upper part of the valve position adjusting nut 26. The valve position locking screw 14 is provided with an external thread, and the side wall of the bracket 18 is provided with an internal thread at the penetration position. The valve position locking screw 14 with the external thread and the bracket 18 with the internal thread are connected together by threads. The free end of the valve position locking screw 14 is tightened against the upper outer side of the valve position adjusting nut 26 to lock the installation position of the valve position adjusting nut 26.

[0047] The minimum opening of the valve is determined by the fitting position of the limit retainer 24 and the valve position adjustment nut 26. The Kv value indication position of the bracket 18 is calibrated. When the valve position adjustment nut 26 rotates to the corresponding Kv indication position of the bracket 18, it is the Kv value of the valve at this minimum opening. After the valve position adjustment nut 26 is adjusted to the actual required position, the position of the valve position adjustment nut 26 is locked by the valve position locking screw 14.

[0048] like Figure 1 As shown, an indicator groove is provided on the side wall of the bracket 18, and a valve position indicator plate 16 with a valve position scale is installed on the indicator groove; a valve position indicator block 22 is sleeved on the top end of the valve stem 6, and the valve position indicator block 22 and the valve stem 6 are fixed by a locking nut 21.

[0049] The valve position indicating rod 15 is located between the valve position indicating block 22 and the bracket 18. One end of the valve position indicating rod 15 is provided with an external thread. One end of the valve position indicating rod 15 with the external thread is threadedly connected to the valve position indicating block 22 with the internal thread hole, that is, the valve position indicating rod 15 with the external thread is screwed into the internal thread hole of the valve position indicating block 22; the other end of the valve position indicating rod 15 extends into the middle position of the indicating groove on the side wall of the bracket 18.

[0050] The output shaft of the actuator 17 is provided with an external thread, the top opening of the valve stem 6 is provided with an internal thread, and the central through hole of the valve position indicating block 22 is provided with an internal thread. The output shaft with external thread of the actuator 17 is connected to the top opening with internal thread of the valve stem 6 and the central through hole with internal thread of the valve position indicating block 22 through a thread, that is, the output shaft with external thread of the actuator 17 is screwed into the central through hole with internal thread of the valve position indicating block 22 and the top opening with internal thread of the valve stem 6.

[0051] The output shaft with external threads of the actuator 17 is sleeved with a lock nut 20 and a locking nut 21 in sequence from top to bottom. The locking nut 21 is located above the valve position indicating block 22. The lock nut 20 and the locking nut 21 are respectively movably connected to the output shaft of the actuator 17 through threads. The locking nut 21 is engaged with the valve position indicating block 22, and the lock nut 20 is engaged with the locking nut 21.

[0052] When the threaded output shaft of the actuator 17 is screwed into the internal thread at the top of the valve stem 6, the locking nut 21 is rotated to make the locking nut 21 fit tightly with the valve position indicator block 22, and then the anti-loosening nut 20 is rotated to make the anti-loosening nut 20 fit tightly with the locking nut 21. During the operation of the valve, the working position of the valve is judged by observing the position of the valve position indicator rod 15 on the valve position indicator plate 16 with valve position scale. At the same time, the valve position indicator rod 15 passes through the middle position of the indicator groove processed on the bracket 18, which can prevent the rotation of the output shaft with external thread of the actuator 17 when the valve is working.

[0053] According to the different internal pressures of the valve, the output shaft with external threads of the actuator 17 is screwed into the depth of the valve stem 6 with internal threads to adjust, and after being screwed to the required position, the locking nut 21 is rotated to make it fit tightly with the valve position indicator block 22, and then the anti-loosening nut 20 is rotated to make the anti-loosening nut 20 fit tightly with the locking nut 21. In this way, the bellows 7 works under different compression states to adapt to different internal working pressures of the valve.

[0054] like Figure 1 As shown, an annular hole is opened at the bottom of the middle flange 23, and the annular hole is connected with the inner cavity of the bellows 7. A leak detection hole 12 is opened on the outer periphery of the middle flange 23, and the leak detection hole 12 is connected with the annular hole. The leak detection plug 9 matches the leak detection hole 12, and the leak detection plug 9 and the leak detection hole 12 are connected by a detachable sealing threaded connection.

[0055] When conducting a valve life test, the leak detection plug 9 is removed. When the bellows 7 ruptures, the airflow enters the leak detection hole 12 along the annular hole of the middle flange 23, and the internal pressure of the bellows is led out through the leak detection hole 12. The bellows leakage can be detected at the leak detection hole 12.

[0056] The partial enlarged view of the small screw 27, the shaft sleeve baffle 28, the shaft sleeve 29, and the shaft sleeve 30 is shown in FIG. Figure 4 shown.

[0057] The shaft sleeve 30 is sleeved on the valve stem 6. The shaft sleeve 30 is located on the internal boss of the middle flange 23. The shaft sleeve 29 is installed in the shaft sleeve 30 to guide the movement of the valve stem 6. The shaft sleeve baffle 28 is installed on the upper end of the shaft sleeve 30 to prevent the shaft sleeve 29 from coming out of the installation groove. The small screw 27 passes through the shaft sleeve baffle 28 and the shaft sleeve 30 and is screwed into the internal boss of the middle flange 23, thereby fastening the shaft sleeve baffle 28, the shaft sleeve 30 and the middle flange 23 together.

[0058] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. An electric vacuum regulating valve for a uranium enrichment plant, characterized in that: The electric vacuum regulating valve comprises: a valve body (1), a valve core (2), a valve stem (6), a bellows (7), a bellows welding plate (13), an actuator (17), a bracket (18) and a middle flange (23); the valve core (2) and the bellows (7) are both located in the valve body (1); the valve core (2) is joined to the inner surface of the valve body (1); the bellows (7) is located above the valve core (2); the bellows (7) and the valve core (2) are fixedly connected; the middle flange (23) is located above the valve body (1); the middle flange (23) and the valve body (1) are fixedly connected; the bellows welding plate (18) and the middle flange (23) are connected to the valve body (1); 3) located between the middle flange (23) and the valve body (1) and above the bellows (7), the bellows welding plate (13) being fixedly connected to the bellows (7); the bracket (18) being located above the middle flange (23), the bracket (18) being fixedly connected to the middle flange (23); the actuator (17) being located above the bracket (18), the actuator (17) being fixedly connected to the bracket (18); the valve stem (6) being located inside the bellows (7), the top of the valve stem (6) extending into the internal through hole of the bracket (18), and the bottom of the valve stem (6) being located inside the opening of the valve core (2); The bellows (7) and the valve core (2) are fixedly connected by welding, and the bellows welding pressure plate (13) and the bellows (7) are fixedly connected by welding; The electric vacuum regulating valve further comprises: an adaptive connecting ball head (3), a disc spring (4) and a first locking nut (5); the adaptive connecting ball head (3) is located below the valve stem (6); the adaptive connecting ball head (3) is fixedly connected to the valve stem (6); the first locking nut (5) is sleeved on the valve stem (6) and located above the valve core (2); the first locking nut (5) is respectively fixedly connected to the valve stem (6) and the valve core (2); the disc spring (4) is sleeved on the valve stem (6) and located between the first locking nut (5) and the adaptive connecting ball head (3); the disc spring (4) is respectively engaged and connected to the first locking nut (5) and the adaptive connecting ball head (3); The electric vacuum regulating valve further comprises: a large sealing ring (10), the large sealing ring (10) being located between the middle flange (23) and the valve body (1), and the large sealing ring (10) being respectively joined and connected to the middle flange (23) and the valve body (1); The electric vacuum regulating valve further comprises: a sealing gasket (8), the sealing gasket (8) being located between the bellows welding pressure plate (13) and the valve body (1), the sealing gasket (8) being respectively joined and connected to the bellows welding pressure plate (13) and the valve body (1); The electric vacuum regulating valve further comprises: a small sealing ring (11), the small sealing ring (11) being located between the bellows welding pressure plate (13) and the middle flange (23), and the small sealing ring (11) being respectively joined and connected to the bellows welding pressure plate (13) and the middle flange (23).

2. The electric vacuum regulating valve for a uranium enrichment plant according to claim 1, characterized in that: The adaptive connecting ball head (3) is fixedly connected to the valve stem (6) via threads, and the first locking nut (5) is fixedly connected to the valve stem (6) and the valve core (2) via threads.

3. The electric vacuum regulating valve for a uranium enrichment plant according to claim 1, characterized in that: The electric vacuum regulating valve further comprises: a valve position locking screw (14), a limit retaining ring (24), and a valve position adjusting nut (26); the limit retaining ring (24) is clamped on the annular groove on the upper part of the valve stem (6); the valve position adjusting nut (26) is sleeved on the valve stem (6) and is located below the limit retaining ring (24); the inner hole of the valve position adjusting nut (26) and the valve stem (6) are clearance-matched; the valve position adjusting nut (26) is movably connected to the bracket (18); the valve position locking screw (14) passes through the side wall of the bracket (18); the valve position locking screw (14) is movably connected to the bracket (18); the free end of the valve position locking screw (14) is pressed against the valve position adjusting nut (26) to lock the installation position of the valve position adjusting nut (26).

4. The electric vacuum regulating valve for a uranium enrichment plant according to claim 1, characterized in that: The electric vacuum regulating valve further comprises: a valve position indicating rod (15), a valve position indicating plate (16), and a valve position indicating block (22); the valve position indicating plate (16) has a valve position scale, the valve position indicating plate (16) is fixedly mounted in an indicating groove on a side wall of a bracket (18), the valve position indicating block (22) is sleeved on a top end of the valve stem (6), and the valve position indicating block (22) is fixedly connected to the valve stem (6); the valve position indicating rod (15) is located between the valve position indicating block (22) and the bracket (18), one end of the valve position indicating rod (15) is fixedly connected to the valve position indicating block (22), and the other end of the valve position indicating rod (15) extends into a middle position of the indicating groove on the side wall of the bracket (18).

5. The electric vacuum regulating valve for a uranium enrichment plant according to claim 4, characterized in that: The output shaft of the actuator (17) is fixedly connected to the valve stem (6) and the valve position indicating block (22).

6. The electric vacuum regulating valve for a uranium enrichment plant according to claim 5, characterized in that: The electric vacuum regulating valve further comprises: a locking nut (20) and a second locking nut (21), the locking nut (20) and the second locking nut (21) being sleeved on the output shaft of the actuator (17) in sequence from top to bottom, the second locking nut (21) being located above the valve position indicating block (22), the locking nut (20) and the second locking nut (21) being movably connected to the output shaft of the actuator (17) respectively, the second locking nut (21) being engaged and connected to the valve position indicating block (22), and the locking nut (20) and the second locking nut (21) being engaged and connected to lock the position of the valve position indicating block (22).

7. The electric vacuum regulating valve for a uranium enrichment plant according to claim 1, characterized in that: The electric vacuum regulating valve further comprises: a leak detection plug (9) and a leak detection hole (12); the leak detection hole (12) is arranged on the outer periphery of the middle flange (23); the leak detection hole (12) is communicated with an annular hole at the bottom of the middle flange (23); the annular hole is connected to the inner cavity of the bellows (7); the leak detection plug (9) matches the leak detection hole (12); the leak detection plug (9) and the leak detection hole (12) are detachably connected via a sealing thread.

8. The electric vacuum regulating valve for a uranium enrichment plant according to claim 1, characterized in that: The electric vacuum regulating valve further comprises: a shaft sleeve baffle (28), a shaft sleeve (29), and a shaft sleeve (30); the shaft sleeve (30) is sleeved on the valve stem (6) and located on an internal boss of the middle flange (23); the shaft sleeve (29) is sleeved on the valve stem (6) and located in the shaft sleeve (30); the shaft sleeve baffle (28) is located at an upper end of the shaft sleeve (30); and the shaft sleeve baffle (28), the shaft sleeve (30) and the middle flange (23) are fixedly connected.

9. The electric vacuum regulating valve for a uranium enrichment plant according to claim 1, characterized in that: The electric vacuum regulating valve further comprises: a valve stem sealing ring (31), the valve stem sealing ring (31) being located between the bottom of the valve stem (6) and the middle flange (23), and the valve stem sealing ring (31) being respectively joined to the valve stem (6) and the middle flange (23).

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