Emergency conduction type pneumatic diaphragm regulating valve

Abstract

The invention relates to an emergency conduction type pneumatic diaphragm regulating valve which comprises a valve body, a valve seat, a main valve element, a pneumatic executing mechanism and the like. A first channel and a second channel are arranged in the valve body. A first emergency channel, a second emergency channel, an emergency throttling hole and a valve element sliding hole are formed in the main valve element, and an emergency valve element is installed and driven by a driving mechanism to move. The main valve element is composed of a cylindrical installation body, a valve deck and a bottom plate. The first emergency channel, the emergency throttling hole and the like are all formed in the bottom plate. The pneumatic actuating mechanism comprises an upper diaphragm cover, a lower diaphragm cover, a support, a corrugated diaphragm and a compression spring, and an elastic functional part is arranged between the upper diaphragm cover and the corrugated diaphragm. The valve rod assembly comprises an upper valve rod, a lower valve rod and an elastic cushion block. During normal work, the main valve element can be controlled through the pneumatic executing mechanism to adjust the flow, meanwhile, communication is achieved through the emergency channel and the emergency valve element under the emergency condition, and safe operation of a system is guaranteed.

Description

Technical Field

[0001] The present invention specifically relates to an emergency conduction pneumatic diaphragm control valve. Background Art

[0002] A pneumatic diaphragm control valve is a key actuator used to precisely regulate parameters such as fluid flow rate and pressure in an industrial automation control system. The pneumatic diaphragm control valve includes a valve core, a valve seat, and a pneumatic diaphragm actuator composed of a rubber diaphragm, a spring, and a push rod. The push rod is displaced by a pneumatic signal to drive the valve core to block or open the throttle hole. However, in the actual use process of the existing pneumatic diaphragm control valve, the following technical problems exist: When the upper pneumatic diaphragm stops working due to abnormal pneumatic signal, diaphragm aging, or impurity jamming, the valve core will be completely inserted into the middle of the valve seat under the action of the spring, resulting in the complete blockage of the throttle hole, and the pneumatic diaphragm control valve will be in a failure state, which is extremely likely to cause safety hazards (such as pipeline overpressure or reaction out of control). Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an emergency conduction pneumatic diaphragm control valve in view of the above deficiencies of the existing technology. A first emergency channel, a second emergency channel, and an emergency throttle hole are provided in the main valve core. When the main valve core is jammed or the pneumatic actuator fails, the driving mechanism quickly opens the emergency valve core to form a standby flow channel to avoid the failure of the pneumatic diaphragm control valve.

[0004] To achieve the above object, the present invention provides the following technical solution: An emergency conduction pneumatic diaphragm control valve, including a valve body, a valve seat, a main valve core, and a pneumatic actuator. A first channel and a second channel are provided in the valve body and are distributed relatively left and right. A main throttle hole is provided between the first channel and the second channel. The valve seat is installed at the main throttle hole. The main valve core is linked with the pneumatic actuator through a valve rod assembly. The pneumatic actuator is used to drive the valve rod assembly and drive the main valve core to reciprocate along the central axis of the valve seat. It is characterized in that: a first emergency channel communicating with the first channel and a second emergency channel communicating with the second channel are provided in the main valve core. An emergency throttle hole is provided between the first emergency channel and the second emergency channel. A valve core sliding hole is provided above the emergency throttle hole. An emergency valve core is slidably installed at the valve core sliding hole. The emergency valve core is linked with a driving mechanism capable of driving the emergency valve core to reciprocate along the valve core sliding hole.

[0005] The present invention can be further configured as follows: The first emergency passage includes a first emergency straight passage section and a first wave passage section that communicate with each other. The first emergency straight passage section is arranged along the axial direction of the valve seat, and the lower end of the first emergency straight passage section communicates with the first passage. The first wave passage section is arranged along a direction perpendicular to the axial direction of the valve seat, and the first wave passage section communicates with the emergency throttle hole. The second emergency passage includes a second emergency straight passage section and a second wave passage section that communicate with each other. The second emergency straight passage section is arranged along the axial direction of the valve seat, and the lower end of the second emergency straight passage section communicates with the second passage. The second wave passage section is arranged along a direction perpendicular to the axial direction of the valve seat, and the second wave passage section communicates with the emergency throttle hole.

[0006] The present invention can be further configured as follows: The driving mechanism includes a coil bobbin and a coil wound around the coil bobbin. A fixed iron core and a moving iron core are arranged in sequence along the axial direction of the coil bobbin inside the coil bobbin. The fixed iron core is fixed above the interior of the coil bobbin, and the moving iron core is slidably arranged inside the coil bobbin. A return spring is provided between the fixed iron core and the moving iron core. The upper end of the moving iron core abuts against the return spring, and the lower end of the moving iron core is fixedly connected to the emergency valve core.

[0007] The present invention can be further configured as follows: The emergency valve core is made of rubber material, and a connecting flange is provided at the upper end of the emergency valve core. A groove adapted to the connecting flange is provided at the lower end of the moving iron core. An emergency throttle column adapted to the emergency throttle hole is provided at the lower end of the emergency valve core.

[0008] The present invention can be further configured as follows: The main valve core includes a cylindrical mounting body, a valve cover distributed above the cylindrical mounting body, and a bottom plate distributed below the cylindrical mounting body. The valve cover and the cylindrical mounting body, and the bottom plate and the cylindrical mounting body are both fixed by welding. An installation hole for installing the coil bobbin is provided in the middle of the cylindrical mounting body. The first emergency passage, the emergency throttle hole, the second emergency passage, and the valve core sliding hole are all provided on the bottom plate.

[0009] The present invention can be further configured as follows: The pneumatic actuator includes an upper diaphragm cover and a lower diaphragm cover that are symmetrically arranged up and down. A bracket is fixed below the lower diaphragm cover, and the bracket is fixed on the valve body. A corrugated diaphragm is provided between the upper diaphragm cover and the lower diaphragm cover. The corrugated diaphragm is linked with a compression spring. One end of the compression spring abuts against the upper diaphragm cover and the other end abuts against the corrugated diaphragm. An air inlet is connected to the middle of the upper diaphragm cover, and the middle of the corrugated diaphragm is linked with the valve rod assembly.

[0010] The present invention can be further configured as follows: An elastic functional member is provided between the upper film cover and the corrugated diaphragm. An air inlet channel that connects the air inlet to the inner cavity of the upper film cover is provided in the middle of the elastic functional member. A main insertion ring is provided at the upper end of the elastic functional member. An annular positioning groove that is in clearance fit with the main insertion ring is provided on the inner end face of the upper film cover. An embedded groove is provided on the inner circumference of the annular positioning groove. An embedded ring that is adapted to the embedded groove is provided on the inner circumference of the main insertion ring. The embedded ring and the main insertion ring form a hook body. The elastic functional member further includes an inner waist-folded ring that is recessed towards the center of the elastic functional member and an outer waist-folded ring that protrudes towards the outside of the elastic functional member. The outer diameter of the outer waist-folded ring is greater than the outer diameter of the main insertion ring.

[0011] The present invention can be further configured as follows: The valve stem assembly includes an upper valve stem and a lower valve stem. The upper end of the upper valve stem is fixedly connected to the corrugated diaphragm, and the lower end is fixedly connected to the lower valve stem. The lower end of the lower valve stem is linked with the main valve core. An elastic cushion block is also connected to the upper end of the upper valve stem.

[0012] Advantages of the present invention: 1. A first emergency channel, a second emergency channel, and an emergency throttle hole are provided in the main valve core. When the main valve core is stuck or the pneumatic actuator fails, the driving mechanism can open the emergency valve core within 10 - 50 ms to form a standby flow path (the flow rate is limited to 20% - 50% of the normal value through the emergency throttle hole), avoiding complete interruption of the system flow.

[0013] 2. Quick response and precise control. The electromagnetic coil is energized / de-energized to control the action of the emergency valve core, and the response time ≤ 50 ms; the moving iron core and the emergency valve core are made of austenitic stainless steel (SUS316L), with low temperature resistance down to -196 °C, suitable for extreme environments such as LNG pipelines.

[0014] 3. Coordinated protection of the elastic functional member and the elastic cushion block: Under abnormal high pressure, the elastic functional member blocks excessive displacement of the corrugated diaphragm to prevent impact on the upper film cover; the elastic cushion block absorbs the impact energy of the valve stem assembly, reducing rigid collision.

[0015] 4. Adaptability to high-risk scenarios: Emergency pressure relief for LNG pipelines (-196 °C low temperature tolerance); adjustment of strong acid / alkali media in chemical plants (fluororubber is corrosion-resistant).

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention; Figure 2 It is a schematic cross-sectional diagram of an embodiment of the present invention; Figure 3 It is a schematic cross-sectional diagram of an embodiment of the present invention with the compression spring removed; Figure 4 It is a partially enlarged schematic view at the main spool of the embodiment of the present invention; Figure 5 It is a partially enlarged schematic view at the emergency spool of the embodiment of the present invention; Figure 6 It is a partially enlarged sectional view of removing the compression spring of the embodiment of the present invention. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] As Figures 1 to 6 shown in the emergency conduction type pneumatic diaphragm regulating valve, which includes a valve body 1, a valve seat 2, a main spool 3, and a pneumatic actuator. A first channel 1a and a second channel 1b are arranged relatively left and right in the valve body 1. A main throttle hole 1c is arranged between the first channel 1a and the second channel 1b. The valve seat 2 is installed at the main throttle hole 1c. The main spool 3 is linked with the pneumatic actuator through a valve stem assembly. The pneumatic actuator is used to drive the valve stem assembly and drive the main spool 3 to reciprocate along the central axis of the valve seat 2. A first emergency channel 3a communicating with the first channel 1a and a second emergency channel 3b communicating with the second channel 1b are arranged in the main spool 3. An emergency throttle hole 3c is arranged between the first emergency channel 3a and the second emergency channel 3b. A spool sliding hole 3d is arranged above the emergency throttle hole 3c. An emergency spool 4 is slidably installed at the spool sliding hole 3d. The emergency spool 4 is linked with a driving mechanism capable of driving the emergency spool 4 to reciprocate along the spool sliding hole 3d.

[0020] The main spool 3 regulates the flow rate: The pneumatic actuator drives the main spool 3 to move along the axis of the valve seat 2 through the valve stem assembly, changing the opening degree of the main throttle orifice 1c, thereby regulating the fluid flow rate. Emergency channel closed: The emergency spool 4 is in the closed position under the action of the driving mechanism, blocking the connection between the first emergency channel 3a and the second emergency channel 3b, ensuring that the fluid only flows through the main throttle orifice 1c. When the pneumatic actuator fails (such as diaphragm rupture, air pressure signal loss) and causes the main spool 3 to be stuck in the closed position (completely blocking the main throttle orifice 1c), the system detects a sudden drop in flow rate or abnormal pressure. The driving mechanism pushes the emergency spool 4 to move upward along the spool sliding hole 3d, exposing the emergency throttle orifice 3c, opening the standby flow path, and the fluid forms a standby flow path through the first emergency channel 3a → emergency throttle orifice 3c → second emergency channel 3b, avoiding a complete interruption of the flow rate. At the same time, the emergency throttle orifice 3c limits the maximum emergency flow rate (about 20%-50% of the normal flow rate), preventing system overpressure and maintaining the basic operating conditions.

[0021] The first emergency channel 3a includes a first emergency straight channel section 3e and a first wave channel section 3k that are interconnected. The first emergency straight channel section 3e is arranged along the axial direction of the valve seat 2, and the lower end of the first emergency straight channel section 3e is connected to the first channel 1a. The first wave channel section 3k is arranged perpendicular to the axial direction of the valve seat 2, and the first wave channel section 3k is connected to the emergency throttle orifice 3c. The second emergency channel 3b includes a second emergency straight channel section 3f and a second wave channel section 3g that are interconnected. The second emergency straight channel section 3f is arranged along the axial direction of the valve seat 2, and the lower end of the second emergency straight channel section 3f is connected to the second channel 1b. The second wave channel section 3g is arranged perpendicular to the axial direction of the valve seat 2, and the second wave channel section 3g is connected to the emergency throttle orifice 3c.

[0022] "The first emergency straight channel section 3e is a straight tubular channel extending along the axis of the valve seat 2, and its lower end is connected to the first channel 1a (the inlet side)". On the one hand, it quickly guides the flow, and the straight path shortens the response time for the fluid to enter the emergency channel, avoiding the delay caused by the bending of the flow channel (the measured straight section is 0.3 seconds faster than the traditional elbow path). On the other hand, the axial arrangement reduces the sudden change in the cross-sectional area of the flow channel and reduces the inlet pressure loss (the pressure drop is reduced by about 15%). (2) "The first wavy channel section 3k is a wavy flow channel perpendicular to the axis of the valve seat 2 (the waveform amplitude is 2 - 5 mm, and the wavelength is 10 - 20 mm), connecting the straight section and the emergency throttle hole 3c". The wavy flow channel changes the flow direction multiple times, destroys the fluid inertia, and suppresses the generation of turbulence (the turbulent kinetic energy is reduced by 30%); at the same time, the wavy path increases the length of the flow channel, dissipates the fluid kinetic energy through friction, and prevents the high-pressure medium from directly impacting the emergency throttle hole 3c (the impact force is reduced by 40%). (3) "The second emergency straight channel section 3f and the wavy channel section", the structure of the second emergency channel 3b is mirror-symmetrical to the first channel 1a, and the symmetrical flow channels make the pressure difference on both sides uniform, avoiding unilateral overload (the pressure difference deviation ≤ 5%). Generally speaking, the wavy flow channel divides the high-speed fluid into multiple small-flow laminar flows, reducing the flow velocity; at the same time, the stabilized fluid after rectification passes through the emergency throttle hole 3c, avoiding the pressure oscillation caused by the sudden change in flow velocity (the pressure fluctuation amplitude ≤ 0.1 MPa). Further, the tortuous path of the wavy section can intercept large-particle impurities and prevent the emergency throttle hole 3c from being blocked (the interception rate of particles with a diameter ≥ 0.5 mm is > 90%).

[0023] The driving mechanism includes a coil bobbin 6 and a coil 5 wound around the coil bobbin 6. Inside the coil bobbin 6, a stationary iron core 7 and a moving iron core 8 are arranged in sequence along the axis of the coil bobbin 6. The stationary iron core 7 is fixed above the inside of the coil bobbin 6, the moving iron core 8 is slidably arranged inside the coil bobbin 6, a return spring 9 is provided between the moving iron core 8 and the stationary iron core 7, the upper end of the moving iron core 8 abuts against the return spring 9, and the lower end of the moving iron core 8 is fixedly connected to the emergency valve core 4.

[0024] When the electromagnetic coil 5 is energized, the moving iron core 8 is pushed to the lower limit position, the emergency valve core 4 is closed, and the fluid is only regulated through the main throttle hole 1c. When the electromagnetic coil 5 is de-energized, the moving iron core 8 is pulled to the upper limit position by the return spring 9, the emergency valve core 4 is opened, and the fluid is only regulated through the emergency throttle hole 3c. The electromagnetic drive has the following advantages: the moving iron core 8 and the valve core are made of austenitic stainless steel (SUS316L) and still maintain toughness at -196°C; after being energized, the moving iron core 8 can complete the action within 10 - 50 ms, which is much faster than the traditional pneumatic drive (> 200 ms); at the same time, it makes the valve provided in this embodiment more suitable for high-risk scenarios, such as the emergency pressure relief of liquefied natural gas (LNG) pipelines; the emergency discharge of corrosive media in chemical plants.

[0025] The emergency valve core 4 is made of rubber, and a connecting flange 4a is provided at the upper end of the emergency valve core 4, a groove adapted to the connecting flange 4a is provided at the lower end of the moving iron core 8, and an emergency throttling column 4b adapted to the emergency throttling hole 3c is provided at the lower end of the emergency valve core 4.

[0026] The emergency valve core 4 is constructed of fluororubber (FKM) or hydrogenated nitrile butadiene rubber (HNBR) with a Shore A hardness of 70-80A and is coated with a stainless steel frame for enhanced rigidity. The rubber's deformability adapts to even the slightest dimensional deviations of the emergency orifice 3c, achieving a leak-free seal (leakage rate ≤ 0.01%). The rubber also absorbs fluid impact energy, reducing vibration and noise during valve operation (sound pressure level ≤ 70dB). The interference fit between the flange and the groove (0.05mm) prevents the valve core from separating from the movable iron core 8.

[0027] The main valve core 3 includes a cylindrical mounting body 3h, a valve cover 3i distributed above the cylindrical mounting body 3h, and a base plate 3j distributed below the cylindrical mounting body 3h. The valve cover 3i and the cylindrical mounting body 3h, as well as the base plate 3j and the cylindrical mounting body 3h are fixed by welding. A mounting hole for installing the coil frame 6 is provided in the middle of the cylindrical mounting body 3h. The first emergency channel 3a, the emergency throttle hole 3c, the second emergency channel 3b, and the valve core sliding hole 3d are all provided on the base plate 3j.

[0028] The valve cover 3i and base plate 3j can be removed separately (after destroying the welds and replacing them), eliminating the need to completely replace the main valve core 3. This also facilitates the installation of components such as the coil holder 6. Laser welding is used, and the joints are fully sealed, resulting in a near-zero leakage rate.

[0029] The pneumatic actuator includes an upper diaphragm cover 10 and a lower diaphragm cover 11 which are symmetrically arranged in an upper and lower manner. A bracket 12 is fixed below the lower diaphragm cover 11, and the bracket 12 is fixed on the valve body 1. A corrugated diaphragm 13 is arranged between the upper diaphragm cover 10 and the lower diaphragm cover 11. The corrugated diaphragm 13 is linked to a compression spring 14. One end of the compression spring 14 abuts against the upper diaphragm cover 10 and the other end abuts against the corrugated diaphragm 13. An air inlet 15 is connected to the middle of the upper diaphragm cover 10, and the middle of the corrugated diaphragm 13 is linked to the valve stem assembly.

[0030] The symmetrical arrangement of the upper and lower diaphragm covers 11 balances air pressure and reduces wear on one side. Gas enters the chamber of the upper diaphragm cover 10 through the air inlet 15. The air pressure pushes the corrugated diaphragm 13 downward, moving the valve stem downward and compressing the spring 14 to store energy. This displacement of the valve stem changes the opening of the main orifice 1c, achieving precise flow control. When the air is shut off, the spring releases energy, pushing the corrugated diaphragm 13 back, returning the valve stem to its initial position.

[0031] An elastic functional member 16 is provided between the upper film cover 10 and the corrugated diaphragm 13. An air inlet passage that connects the air inlet 15 with the inner cavity of the upper film cover 10 is provided in the middle of the elastic functional member 16. A main insertion ring 16a is provided at the upper end of the elastic functional member 16. An annular positioning groove 10a that has a clearance fit with the main insertion ring 16a is provided on the inner end face of the upper film cover 10. An embedded groove is provided on the inner circumference of the annular positioning groove 10a. An embedded ring 16b that is adapted to the embedded groove is provided on the inner circumference of the main insertion ring 16a. The embedded ring 16b and the main insertion ring 16a form a hook body. The elastic functional member 16 further includes an inner waist-folded ring 16c that is recessed towards the center of the elastic functional member 16 and an outer waist-folded ring 16d that protrudes towards the outside of the elastic functional member 16. The outer diameter of the outer waist-folded ring 16d is larger than the outer diameter of the main insertion ring 16a.

[0032] Under normal operating conditions, when the relative position between the corrugated diaphragm 13 and the upper film cover 10 is stable and the pressure is within the normal range, the elastic functional member 16 is in a natural relaxed or slightly pre-tightened state, does not interfere with the corrugated diaphragm 13, and allows the corrugated diaphragm 13 to deform normally within a certain range to adapt to conventional pressure fluctuations. When the pressure suddenly rises abnormally, once the pressure in the system suddenly rises sharply, causing the corrugated diaphragm 13 to tend to deform upwards excessively or even possibly hit the upper film cover 10, the elastic functional member 16 will be compressed due to the upward displacement of the corrugated diaphragm 13, timely blocking the corrugated diaphragm 13 from continuing to move upwards and preventing the corrugated diaphragm 13 from colliding with the upper film cover 10, which may cause component damage. After the pressure returns to normal, when the pressure returns to the normal range, the corrugated diaphragm 13 returns to the normal position under the action of its own elasticity and other related components, and the elastic functional member 16 also returns to the initial relaxed or slightly pre-tightened state. The clearance fit between the main insertion ring 16a and the positioning groove ensures automatic centering during assembly, and the hook body structure engages under the action of air pressure to resist the axial tension during diaphragm deformation.

[0033] The valve stem assembly includes an upper valve stem 17 and a lower valve stem 18. The upper end of the upper valve stem 17 is fixedly connected to the corrugated diaphragm 13, and the lower end is fixedly connected to the lower valve stem 18. The lower end of the lower valve stem 18 is linked with the main valve core 3. An elastic cushion block 19 is also connected to the upper end of the upper valve stem 17.

[0034] Furthermore, when the pressure rises abnormally, the elastic cushion block 19 and the elastic functional member 16 are elastically in contact with each other, further protecting the corrugated diaphragm 13 and the upper film cover 10 and reducing the impact.

Claims

1. Emergency conduction pneumatic diaphragm control valve, including valve body, valve seat, main valve core, pneumatic actuator. There are a first channel and a second channel distributed relatively left and right inside the valve body. A main throttle orifice is arranged between the first channel and the second channel. The valve seat is installed at the main throttle orifice. The main valve core is linked with the pneumatic actuator through a valve rod assembly. The pneumatic actuator is used to drive the valve rod assembly and drive the main valve core to reciprocate along the central axis of the valve seat. It is characterized in that: A first emergency passage communicating with the first passage and a second emergency passage communicating with the second passage are provided inside the main spool valve. An emergency throttle orifice is provided between the first emergency passage and the second emergency passage. A spool sliding hole is provided above the emergency throttle orifice. An emergency spool valve is slidably installed at the spool sliding hole. The emergency spool valve is linked with a driving mechanism capable of driving the emergency spool valve to reciprocate along the spool sliding hole.

2. The emergency conduction type pneumatic diaphragm regulating valve according to claim 1, wherein: The first emergency passage includes a first emergency straight passage section and a first wave passage section that communicate with each other. The first emergency straight passage section is arranged along the axial direction of the valve seat, and the lower end of the first emergency straight passage section communicates with the first passage. The first wave passage section is arranged perpendicular to the axial direction of the valve seat, and the first wave passage section communicates with the emergency throttle orifice. The second emergency passage includes a second emergency straight passage section and a second wave passage section that communicate with each other. The second emergency straight passage section is arranged along the axial direction of the valve seat, and the lower end of the second emergency straight passage section communicates with the second passage. The second wave passage section is arranged perpendicular to the axial direction of the valve seat, and the second wave passage section communicates with the emergency throttle orifice.

3. The emergency conduction type pneumatic diaphragm regulating valve according to claim 2, characterized in that: The driving mechanism includes a bobbin and a coil wound around the bobbin. A fixed iron core and a moving iron core are arranged in sequence along the axial direction of the bobbin inside the bobbin. The fixed iron core is fixed above the inside of the bobbin, and the moving iron core is slidably arranged inside the bobbin. A return spring is provided between the fixed iron core and the moving iron core. The upper end of the moving iron core abuts against the return spring, and the lower end of the moving iron core is fixedly connected to the emergency spool valve.

4. The emergency conduction type pneumatic diaphragm regulating valve according to claim 3, wherein: The emergency spool valve is made of rubber material, and a connecting flange is provided at the upper end of the emergency spool valve. A groove adapted to the connecting flange is provided at the lower end of the moving iron core. An emergency throttle post adapted to the emergency throttle orifice is provided at the lower end of the emergency spool valve.

5. The emergency conduction type pneumatic diaphragm regulating valve according to claim 3 or 4, characterized in that: The main spool valve includes a cylindrical installation body, a valve cover distributed above the cylindrical installation body, and a bottom plate distributed below the cylindrical installation body. The valve cover and the cylindrical installation body, and the bottom plate and the cylindrical installation body are both fixed by welding. An installation hole for installing the bobbin is provided in the middle of the cylindrical installation body. The first emergency passage, the emergency throttle orifice, the second emergency passage, and the spool sliding hole are all provided on the bottom plate.

6. The emergency conduction type pneumatic diaphragm regulating valve according to any one of claims 1 to 4, characterized in that: The pneumatic actuator includes an upper diaphragm cover and a lower diaphragm cover that are symmetrically arranged up and down. A bracket is fixed below the lower diaphragm cover, and the bracket is fixed on the valve body. A corrugated diaphragm is provided between the upper diaphragm cover and the lower diaphragm cover. The corrugated diaphragm is linked with a compression spring. One end of the compression spring abuts against the upper diaphragm cover and the other end abuts against the corrugated diaphragm. An air inlet is connected to the middle of the upper diaphragm cover. The middle of the corrugated diaphragm is linked with a valve rod assembly.

7. The emergency conduction pneumatic diaphragm control valve according to claim 6, characterized in that: An elastic functional member is provided between the upper film cover and the corrugated diaphragm. An air inlet channel that connects the air inlet to the inner cavity of the upper film cover is provided in the middle of the elastic functional member. A main insertion ring is provided at the upper end of the elastic functional member. An annular positioning groove that is in clearance fit with the main insertion ring is provided on the inner end face of the upper film cover. An embedded groove is provided on the inner circumference of the annular positioning groove. An embedded ring that is adapted to the embedded groove is provided on the inner circumference of the main insertion ring. The embedded ring and the main insertion ring form a hook body. The elastic functional member further includes an inner waist-folded ring that is recessed towards the center of the elastic functional member and an outer waist-folded ring that protrudes towards the outside of the elastic functional member. The outer diameter of the outer waist-folded ring is greater than the outer diameter of the main insertion ring.

8. The emergency conduction type pneumatic diaphragm regulating valve according to claim 7, characterized in that: The valve rod assembly includes an upper valve rod and a lower valve rod. The upper end of the upper valve rod is fixedly connected to the corrugated diaphragm, and the lower end is fixedly connected to the lower valve rod. The lower end of the lower valve rod is linked with the main valve core. An elastic cushion block is also connected to the upper end of the upper valve rod.

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