A primary-secondary collaborative ductile globe valve with a self-recovering valve stem

Abstract

The present invention discloses a primary-secondary collaborative resilient globe valve with a self-recoverable valve stem, which relates to the technical field of valves and aims to solve the problem of how to timely detect the valve stem fracture fault and automatically recover the valve stem function. The globe valve includes a main valve and a secondary valve. The main valve mainly consists of a main valve body, a main valve cover, a main valve stem, a main valve core, a valve stem fracture self-sensing mechanism, and a redundant valve stem mechanism. Through the provided valve stem fracture self-sensing mechanism, it can be automatically identified when the main valve stem fractures and causes the main valve core to fall to the valve seat. Through the provided redundant valve stem mechanism, after the valve stem fracture self-sensing mechanism identifies the fracture of the main valve stem, it can control the redundant valve stem to connect with the main valve core instead of the main valve stem, realizing the self-recovery of the valve stem function and ensuring the resilience at the structural level of the globe valve. Through the provided secondary valve, it can replace the main valve to conduct overcurrent control after the main valve stem fractures and before self-repair, enabling the globe valve to maintain its original function without loss and ensuring its resilience at the functional level.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a primary-secondary coordinated tough stop valve with a self-recoverable valve stem. Background Art

[0002] A valve is a pipe fitting that controls the direction, pressure, flow and other fluid properties of a fluid system. It is widely used in the control of various fluid media such as water, oil, and natural gas. However, after long-term use, the valve stem often breaks due to stress concentration, fatigue failure, and other reasons, and the valve core separates from the valve stem and falls off, causing the valve to lose its function. In addition, the valve stem and valve core are set in the valve cavity of the valve, and the failure of the valve stem to break is difficult to be directly detected, which increases the difficulty of valve monitoring and maintenance. In the past, maintenance of the valve stem generally required the valve to be disassembled as a whole, which was extremely inconvenient; and disassembling the valve for repair would also cause the fluid system to stop working, which consumed too much time and economic costs.

[0003] Currently, the solution to valve stem breakage failure is to add a quick-release structure to the valve. For example, the Chinese utility model patent with the authorization announcement number CN212107009U discloses a stop valve with a replaceable valve stem, including a valve tube, a through hole is provided in the valve tube, a round hole is provided at the top of the through hole, a stop ball is provided in the through hole, a cylindrical groove is provided at the top of the stop ball, and clamping grooves are provided on both sides of the cylindrical groove; a valve stem is provided in the cylindrical groove, a rectangular groove is symmetrically provided in the valve stem, a through groove is provided on one side of the rectangular groove, a limit plate is provided at the bottom of the rectangular groove, a clamping block is provided on one side of the limit plate, a plurality of springs are provided on the other side of the limit plate, and a rectangular plate is provided on the top of the limit plate. The utility model arranges the valve stem, the limit plate, the clamping block, the rectangular plate and the spring; the upper ends of the two rectangular plates are moved away from each other, so that the lower end of the rectangular plate drives the limit plate and the clamping block to move in the direction of the spring, and the clamping block is separated from the clamping groove. At this time, the valve stem can be moved upward to move the valve stem out of the round hole and the cylindrical groove, so as to ensure that the valve stem can be replaced in time after being damaged.

[0004] Although the above-mentioned stop valve with replaceable valve stem can be replaced in time after the valve stem is damaged, whether the valve stem is damaged still depends on additional monitoring of the valve. Not only is it difficult to detect the valve stem breakage failure in time, but it is still necessary to stop the operation to disassemble and maintain the valve, which has certain inconveniences in operation. In addition, the cost consumption caused by the shutdown is still high. Summary of the invention

[0005] The present invention provides a primary-secondary coordinated tough stop valve with a self-recoverable valve stem, which aims to solve the problem of how to timely detect a valve stem fracture failure and restore the valve stem function without disassembling the valve.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a primary-secondary coordinated tough stop valve with a self-recoverable valve stem, comprising a main valve and a secondary valve; the main valve comprises a main valve body, a main valve cover, a main valve stem, a main valve core, a valve stem fracture self-sensing mechanism and a redundant valve stem mechanism;

[0007] A main valve cavity is provided inside the main valve body, a valve seat is formed at the bottom of the main valve cavity, the main valve cavity is upwardly connected to the top surface of the main valve body, and a main valve top opening is formed on the top surface of the main valve body; the main valve cavity is divided into a first cavity section, a second cavity section and a third cavity section from top to bottom; a main valve first inlet connected to the third cavity section is provided at the bottom of the main valve body; a main valve first outlet connected to the third cavity section, as well as a main valve second inlet and a main valve second outlet respectively connected to the second cavity section are provided on the side of the main valve body;

[0008] The main valve cover is sealed at the top of the main valve;

[0009] The main valve stem is vertically arranged through the main valve cover, and the lower part of the main valve stem extends into the main valve cavity; the stem section of the main valve stem outside the main valve cavity is the main valve stem outer section;

[0010] The main valve core is movably arranged in the second cavity section and connected to the lower end of the main valve stem; the main valve stem can drive the main valve core to move up and down in the second cavity section, so that the first inlet of the main valve and the second outlet of the main valve are switched between a connected state and a cut-off state; a valve core flow channel is provided on the main valve core, and when the main valve core is matched with the valve seat, the valve core flow channel can connect the first inlet of the main valve with the first outlet of the main valve;

[0011] The valve stem fracture self-sensing mechanism comprises a push block chamber provided in the cavity wall of the main valve cavity, a limit block channel connecting the push block chamber with the second cavity section, a limit frame channel penetrating from the top surface of the push block chamber to the top surface of the main valve body, a push block having a groove and movably arranged in the push block chamber, a push block spring arranged in the push block chamber and between the cavity wall surface on the outer side of the push block chamber and the push block, a limit top block and a limit frame; the limit top block is movably arranged in the limit block channel, one end of which abuts against the main valve core and the other end abuts against the push block, and the push block spring is in a compressed state, and the lower opening of the limit frame channel is staggered with the notch of the groove; the lower part of the limit frame is embedded in the limit frame channel, and the lower end of the limit frame abuts against the top surface of the push block;

[0012] The redundant valve stem mechanism includes a telescopic upper platform, a telescopic lower platform, a telescopic assembly, a redundant valve stem, and a main valve core gripper. The telescopic upper platform is arranged on the outer section of the main valve stem. The telescopic lower platform is slidably arranged on the outer section of the main valve stem, is located below the telescopic upper platform, and is supported by a limiting frame. The telescopic assembly is arranged between the telescopic upper platform and the telescopic lower platform and is in a compressed state. The redundant valve stem is in a cylindrical shape, sleeved on the main valve stem, with its upper end connected to the telescopic lower platform and its lower end extending into the first cavity section. The main valve core gripper can be connected with the main valve core in a matching manner, is arranged in the first cavity section, and is connected to the lower end of the redundant valve stem.

[0013] The secondary valve has a secondary valve inlet, a secondary valve outlet, and a secondary valve stem. The secondary valve inlet is connected to the first outlet of the main valve through a main-secondary valve connecting pipe, and the secondary valve outlet is connected to the second inlet of the main valve. The secondary valve stem is connected to the main valve stem through a main-secondary valve linkage plate.

[0014] Further, the second cavity section has an ellipsoidal chamber, and the cross-sectional dimension of the ellipsoidal chamber is larger than the cross-sectional dimensions of other parts of the second cavity section. The second inlet and the second outlet of the main valve are respectively communicated with the ellipsoidal chamber.

[0015] Further, a limiting top block receiving bin is arranged on the top surface of the main valve core. When the main valve core cooperates with the valve seat, the inlet of the limiting top block receiving bin is correspondingly communicated with the limiting block channel.

[0016] Further, the telescopic assembly includes at least two telescopic mechanisms evenly distributed around the outer section of the main valve stem. The telescopic mechanism includes a telescopic upper connecting rod and a telescopic lower connecting rod. The proximal ends of the telescopic upper connecting rod and the telescopic lower connecting rod are movably connected through a hinge shaft with a torsion spring, and the distal ends of the telescopic upper connecting rod and the telescopic lower connecting rod are respectively hinged to the telescopic upper platform and the telescopic lower platform.

[0017] Further, adjacent two telescopic mechanisms are connected through a telescopic assembly self-locking mechanism. The telescopic assembly self-locking mechanism includes a limiting constraint cylinder and a limiting constraint rod.

[0018] The inner cavity of the limiting constraint cylinder is sequentially divided into a movable connection cavity section, a transition cavity section, and a limiting constraint cavity section from the cylinder opening inward. The cross-sectional dimension of the limiting constraint cavity section is larger than that of the transition cavity section, and a limiting end face is formed at the connection between the transition cavity section and the limiting constraint cavity section.

[0019] A radially telescopic self-locking elastic block is arranged on the side wall of the head end of the limiting constraint rod, and a spring for the elastic block is arranged between the self-locking elastic block and the limiting constraint rod.

[0020] The limiting and constraining cylinder is connected to one of the telescopic mechanisms, and its cylinder opening faces the other telescopic mechanism; the tail end of the limiting and constraining rod is connected to the other telescopic mechanism, and its head end is embedded in the movable connection cavity section; when the telescopic mechanism is fully extended, the two adjacent telescopic mechanisms approach relatively, the head end of the limiting and constraining rod passes through the transition cavity section and extends into the limiting and constraining cavity section, and under the elastic force of the bullet spring, the self-locking bullet extends and is stuck at the limiting end face.

[0021] Further, there are at least three self-locking bullets, which are evenly distributed around the axis of the limiting and constraining rod;

[0022] The limiting and constraining cylinder is provided with an unlocking port communicating with the limiting and constraining cavity section.

[0023] Further, an L-shaped groove is formed on the main valve core, there are at least two L-shaped grooves, which are evenly distributed around the axis of the main valve core, and a guiding and anti-rotation structure is provided between the side wall of the main valve core and the cavity wall of the main valve cavity;

[0024] The main valve core gripper has an L-shaped claw that can be embedded in and cooperate with the L-shaped groove; the number of L-shaped claws is equal to the number of L-shaped grooves and is arranged in one-to-one correspondence with them;

[0025] The telescopic upper platform is rotatably arranged on the outer section of the main valve rod; a gripper driving mechanism capable of driving the telescopic upper platform to rotate is arranged on the main valve body, and the gripper driving mechanism can drive the telescopic upper platform to drive the main valve core gripper to rotate after the L-shaped claw is embedded in the L-shaped groove, so that the L-shaped claw and the L-shaped groove are matched together.

[0026] Further, a lock block groove is formed at the rear side of the groove bottom surface of the L-shaped groove, a redundant valve rod lock block is movably arranged in the lock block groove, and a lock block spring is arranged between the redundant valve rod lock block and the groove bottom surface of the lock block groove; when the L-shaped claw is embedded in the L-shaped groove and cooperates with it, the redundant valve rod lock block extends into the L-shaped groove under the elastic force of the lock block spring and blocks at the rear side of the L-shaped claw.

[0027] Further, there are two valve rod fracture self-sensing mechanisms, which are symmetrically arranged on the main valve body;

[0028] The main valve further includes a main valve stroke limiting mechanism arranged on the main valve body for limiting the stroke of the main valve rod;

[0029] The main valve stroke limiting mechanism includes a stroke limiting ring arranged on the main valve body through a stroke limiting bracket, and a stroke limiting block is arranged on the stroke limiting ring directly below the telescopic upper platform.

[0030] Further, the secondary valve includes a secondary valve body, a secondary valve cover, a secondary valve gate plate and a secondary valve rod;

[0031] The interior of the secondary valve body is provided with a secondary valve cavity. The side of the secondary valve body is provided with a secondary valve inlet and a secondary valve outlet that are respectively communicated with the secondary valve cavity. The top of the secondary valve body is provided with a secondary valve top port that is communicated with the secondary valve cavity.

[0032] The secondary valve cover is sealingly arranged at the secondary valve top port.

[0033] The secondary valve gate is arranged in the secondary valve cavity.

[0034] The secondary valve stem is vertically arranged through the secondary valve cover and is connected to the secondary valve gate. The secondary valve stem can drive the secondary valve gate to move up and down, so that the secondary valve inlet and the secondary valve outlet can be switched between a communicating state and a cut-off state.

[0035] The beneficial effects of the present invention are as follows: The stop valve includes a main valve and a secondary valve. The main valve mainly consists of a main valve body, a main valve cover, a main valve stem, a main valve core, a valve stem fracture self-sensing mechanism, and a redundant valve stem mechanism. Through the set valve stem fracture self-sensing mechanism, when the main valve stem breaks and the main valve core drops to the valve seat, the position blocking the limit stop block is vacated, so that the push block spring can push the push block to a position where the notch of the drop groove is exactly aligned with the lower opening of the limit frame channel. Then, the limit frame can drop into the drop groove, realizing the automatic identification of the valve stem fracture fault, with timely response and high reliability. Through the set redundant valve stem mechanism, without disassembling the valve, when the limit frame drops into the drop groove and vacates the position blocking the telescopic lower platform, the telescopic assembly can drive the telescopic lower platform to drive the redundant valve stem and the main valve core gripper to move downward. Furthermore, the main valve core gripper can be matched and connected with the main valve core that has dropped to the valve seat, so that the redundant valve stem can replace the main valve stem to be connected with the main valve core, realizing the self-recovery of the valve stem function and ensuring the toughness of the stop valve at the structural level. Since the self-repair can be realized without disassembling the valve after the main valve stem breaks, the convenience and speed of repair are greatly improved. The secondary valve is connected to the main valve through the main and secondary valve connecting pipe, and the secondary valve stem is connected to the main valve stem through the main and secondary valve linkage plate. Therefore, after the main valve stem breaks and before self-repair, it can control the flow through instead of the main valve, so that the stop valve maintains its original function without loss, ensuring the toughness at the functional level. Moreover, after the main valve stem breaks, under normal working conditions, the stop valve can perform valve stem self-repair simultaneously without shutting down or stopping work, which is beneficial to ensuring production efficiency and greatly reducing the operation and maintenance cost.

[0036] The technical effects brought by or directly generated by other technical features of the present invention will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0038] Figure 2 is a sectional structural schematic diagram of the present invention;

[0039] Figure 3 is a sectional view along Figure 2 section line A-A in

[0040] Figure 4 is Figure 2 a partial enlarged view at position B in

[0041] Figure 5 is Figure 2 a partial enlarged view at position C in

[0042] Figure 6 is Figure 3 a partial enlarged view at position D in

[0043] Figure 7 a schematic sectional view of the main valve stem of the present invention after fracture and self-repair;

[0044] Figure 8 is along Figure 7 section line E-E in

[0045] Figure 9 a schematic sectional view of the self-locking mechanism of the telescopic assembly in the present invention before self-locking;

[0046] Figure 10 a schematic sectional view of the self-locking mechanism of the telescopic assembly in the present invention after self-locking;

[0047] The markings in the figure are: 100 - main valve, 110 - main valve body, 111 - valve seat, 112 - axial guide groove, 113 - first cavity section, 114 - second cavity section, 1141 - ellipsoidal cavity, 115 - third cavity section, 116 - first inlet of the main valve, 117 - first outlet of the main valve, 118 - second inlet of the main valve, 119 - second outlet of the main valve, 120 - main valve cover, 130 - main valve stem, 140 - main valve core, 141 - valve core flow channel, 142 - receiving bin for the limit top block, 143 - L-shaped groove, 144 - anti-rotation rib, 145 - lock block groove, 146 - redundant valve stem lock block, 147 - lock block spring, 150 - self-sensing mechanism for valve stem fracture, 151 - push block chamber, 152 - limit block channel, 153 - limit frame channel, 154 - dropping groove, 155 - push block, 156 - push block spring, 157 - limit top block, 158 - limit frame, 160 - redundant valve stem mechanism, 161 - telescopic upper platform, 162 - telescopic lower platform, 163 - telescopic mechanism, 1631 - telescopic upper connecting rod, 1632 - telescopic lower connecting rod, 1633 - hinge shaft, 164 - redundant valve stem, 165 - main valve core gripper, 1651 - L-shaped claw, 166 - self-locking mechanism for telescopic assembly, 1661 - limit constraint cylinder, 1662 - movable connection cavity section, 1663 - transition cavity section, 1664 - limit constraint cavity section, 1665 - limit end face, 1666 - limit constraint rod, 1667 - self-locking spring block, 1668 - spring block spring, 170 - main valve stroke limit mechanism, 171 - stroke limit support, 172 - stroke limit ring, 173 - stroke limit block, 200 - secondary valve, 210 - secondary valve body, 211 - secondary valve cavity, 212 - secondary valve inlet, 213 - secondary valve outlet, 214 - secondary valve top port, 220 - secondary valve cover, 230 - secondary valve gate plate, 240 - secondary valve stem, 310 - connecting pipe between main and secondary valves, 320 - linkage plate between main and secondary valves. Detailed implementation mode

[0048] The present invention will be further described below in conjunction with the drawings and embodiments. The same reference numerals in the drawings denote the same component, or components with the same function, or similar components. Although various aspects of the embodiments are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position and dimensional relationship based on the orientation or position relationship shown in the drawings. It is only for convenience of description and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0050] In the description of the present invention, the term "toughness" means: the ability of a device or component to restore its original function and use by itself after failure or damage; for example: after the main valve stem 130 breaks, the redundant valve stem 164 can be connected to the main valve core 140 through the main valve core gripper 165 to automatically restore the valve stem function. When the term "plurality" indicates a quantity, it usually means a quantity of three or more, for example: "a plurality of" usually means three or more. The expression of "mainly composed of... or constituted by..." is interpreted as that it can also contain structural components not mentioned in this sentence. The term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example: A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0051] Combined with Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 and Figure 8 As shown in

[0052] A primary-secondary collaborative toughness globe valve with self-restoring valve stem includes a main valve 100 and a secondary valve 200; the main valve 100 includes a main valve body 110, a main valve cover 120, a main valve stem 130, a main valve core 140, a valve stem fracture self-sensing mechanism 150, and a redundant valve stem mechanism 160;

[0053] The main valve cover 120 is hermetically arranged at the top opening of the main valve to seal the main valve cavity; the main valve cover 120 is generally connected and fixed to the main valve body 110 through connecting parts such as screws and bolts, and a sealing gasket is generally arranged between the main valve cover 120 and the main valve body 110 for sealing;

[0054] The main valve stem 130 is vertically arranged through the main valve cover 120, and the lower part of the main valve stem 130 extends into the main valve cavity to transmit the power of the actuator; the rod section of the main valve stem 130 outside the main valve cavity is the outer section of the main valve stem;

[0055] The main valve core 140 is movably arranged in the second cavity section 114 and is connected to the lower end of the main valve stem 130; the main valve stem 130 can drive the main valve core 140 to move up and down in the second cavity section 114, so that the first inlet of the main valve 116 and the second outlet of the main valve 119 are switched between the communicating state and the cut-off state; a valve core flow channel 141 is arranged on the main valve core 140. When the main valve core 140 cooperates with the valve seat 111, the valve core flow channel 141 can communicate the first inlet of the main valve 116 with the first outlet of the main valve 117;

[0056] The valve stem fracture self-sensing mechanism 150 includes a push block chamber 151 opened in the wall of the main valve cavity, a limit block channel 152 communicating the push block chamber 151 with the second cavity section 114, a limit frame channel 153 penetrating from the top surface of the push block chamber 151 to the top surface of the main valve body 110, a push block 155 having a falling groove 154 and movably arranged in the push block chamber 151, a push block spring 156 arranged in the push block chamber 151 and between the outer wall surface of the push block chamber 151 close to the outside and the push block 155, and a limit top block 157 and a limit frame 158; the limit block channel 152 is usually arranged in the side limit area of the main valve core 140, and the side limit area refers to the area where the main valve core 140 is always blocked and limited by the side during the up and down movement under normal working conditions; the limit top block 157 is movably arranged in the limit block channel 152, one end of which abuts against the main valve core 140, the other end abuts against the push block 155, and the push block spring 156 is in a compressed state, and the lower opening of the limit frame channel 153 is staggered from the notch of the falling groove 154, that is, the notch of the falling groove 154 is farther from the second cavity section 114 than the lower opening of the limit frame channel 153; the lower part of the limit frame 158 is embedded in the limit frame channel 153, and its lower end abuts against the top surface of the push block 155; in order to ensure that when the limit top block 157 is not blocked by the main valve core 140, it can be pushed out of the limit block channel 152 by the push block 155, a push block protrusion that can penetrate the limit block channel 152 is usually arranged on the side of the push block 155; under normal working conditions, a part of the push block protrusion extends into the limit block channel 152 and abuts against the limit top block 157; when the limit top block 157 is not blocked by the main valve core 140, the push block spring 156 pushes the push block 155 towards the main valve cavity, and then the push block protrusion penetrates the limit block channel 152 to push the limit top block 157 out;

[0057] The redundant valve rod mechanism 160 includes a telescopic upper platform 161, a telescopic lower platform 162, a telescopic assembly, a redundant valve rod 164, and a main valve core gripper 165; the telescopic upper platform 161 is arranged on the outer section of the main valve rod; the telescopic lower platform 162 is slidably arranged on the outer section of the main valve rod, and is located below the telescopic upper platform 161 and is supported by the limit frame 158; the telescopic lower platform 162 can directly press on the upper end of the limit frame 158, or press on the structural part connected to the upper end of the limit frame 158, or can be directly or indirectly connected to the limit frame 158 and be supported; the telescopic assembly is arranged between the telescopic upper platform 161 and the telescopic lower platform 162 and is in a compressed state; the telescopic assembly usually consists of one, two or more telescopic mechanisms 163, and the telescopic mechanism 163 can be a spring telescopic mechanism, a magnetic telescopic mechanism, a pneumatic telescopic mechanism, etc.; the redundant valve rod 164 is in a cylindrical shape, sleeved on the main valve rod 130, with its upper end connected to the telescopic lower platform 162 and its lower end extending into the first cavity section 113; the main valve core gripper 165 can be cooperatively connected with the main valve core 140, is arranged in the first cavity section 113 and is connected to the lower end of the redundant valve rod 164; the main valve core gripper 165 can be a gripper mechanism that can directly grab the main valve core 140, or can be a connection structure having a connection structure that can be connected to the main valve core 140, such as a snap connection structure, a plug connection structure, a threaded connection structure, a magnetic attraction connection structure, etc.;

[0058] The secondary valve 200 has a secondary valve inlet 212, a secondary valve outlet 213, and a secondary valve rod 240; the secondary valve inlet 212 is connected to the main valve first outlet 117 through the main-secondary valve connecting pipe 310, and the secondary valve outlet 213 is connected to the main valve second inlet 118; the secondary valve rod 240 is connected to the main valve rod 130 through the main-secondary valve linkage plate 320.

[0059] Under normal operating conditions, that is, when the main valve stem 130 is not broken, since the main valve core 140 always fits against the wall surface of the main valve cavity within its stroke, the limit top block 157 is blocked and limited by the main valve core 140, the push block spring 156 is in a compressed state, and the limit frame 158 is always supported by the top surface of the push block 155 and cannot fall. Therefore, the limit frame 158 always supports the telescopic lower platform 162, the redundant valve stem 164 of the redundant valve stem mechanism 160 and the main valve core gripper 165 are not released, and the main valve core gripper 165 is in the first cavity section 113 without interfering with the normal operation of the main valve 100. When a valve stem fracture fault occurs, that is, the main valve stem 130 breaks, the main valve core 140 is no longer connected to the main valve stem 130 and thus falls downward to the third cavity section 115 and mates with the valve seat 111; at this time, the main valve core 140 vacates the position blocking the limit top block 157, and then the limit top block 157 no longer blocks the push block 155. Under the elastic force of the push block spring 156, the push block 155 is pushed toward the position close to the main valve cavity. When the notch of the falling groove 154 corresponds exactly to the lower opening of the limit frame channel 153, the limit frame 158 is not supported and falls into the falling groove 154; at the same time, the limit frame 158 vacates the original position supporting the telescopic lower platform 162. The telescopic upper platform 161 is not moved downward due to being connected to the primary and secondary valve linkage plate 320, and the compressed telescopic assembly will drive the telescopic lower platform 162 to drive the redundant valve stem 164 and the main valve core gripper 165 to move downward relative to the telescopic upper platform 161. Furthermore, the main valve core gripper 165 is connected and mated with the main valve core 140 that has fallen to the valve seat 111, so that the redundant valve stem 164 can replace the main valve stem 130 to be connected to the main valve core 140, realizing the operation of automatically identifying and releasing the redundant valve stem 164 for self-repair after the main valve stem 130 breaks.

[0060] The overall toughness design of this globe valve mainly includes the structural toughness level and the functional toughness level. For the structural toughness: Firstly, through the valve stem fracture self-sensing mechanism 150 set, when the main valve stem 130 breaks and the main valve core 140 drops to the valve seat 111, the position blocking the limiting top block 157 is vacated, so that the push block spring 156 can push the push block 155 to a position where the notch of the dropping groove 154 is exactly aligned with the lower opening of the limiting frame channel 153. Then, the limiting frame 158 can drop into the dropping groove 154, realizing the automatic identification of the valve stem fracture fault. It not only responds in a timely manner, but also this fault is identified only through the mechanical structure and not through electrical components, with high reliability. Secondly, through the redundant valve stem mechanism 160 set, without manual disassembly, repair or replacement and other intervention operations, when the limiting frame 158 drops into the dropping groove 154 and vacates the position blocking the telescopic lower platform 162, the telescopic assembly drives the telescopic lower platform 162 to drive the redundant valve stem 164 and the main valve core gripper 165 to move downward. Then, the main valve core gripper 165 can be connected in cooperation with the main valve core 140 that has dropped to the valve seat 111. Thus, the redundant valve stem 164 can replace the main valve stem 130 to be connected with the main valve core 140, realizing the self-recovery of the valve stem function and ensuring the toughness of the globe valve at the structural level. For the functional toughness: The secondary valve 200 is connected to the main valve 100 through the main-secondary valve communication pipe 310, and the secondary valve stem 240 is connected to the main valve stem 130 through the main-secondary valve linkage plate 320. Therefore, after the main valve stem 130 breaks and before self-repair, the secondary valve 200 can replace the main valve 100 to conduct overcurrent control, so that the globe valve maintains its original function without loss, ensuring the toughness at the functional level. Moreover, after the main valve stem 130 breaks, under normal working conditions, the globe valve can simultaneously perform self-repair of the valve stem without stopping the machine or work, which is beneficial to ensuring production efficiency and greatly reducing the operation and maintenance costs.

[0061] Combined with Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, in some embodiments, the second cavity section 114 has an ellipsoidal chamber 1141, and the cross-sectional dimension of the ellipsoidal chamber 1141 is larger than the cross-sectional dimensions of other parts of the second cavity section 114; the main valve second inlet 118 and the main valve second outlet 119 are respectively communicated with the ellipsoidal chamber 1141. The ellipsoidal chamber 1141 is conducive to communicating the main valve second inlet 118 and the main valve second outlet 119 on the one hand, and can increase the area and spatial volume of the overcurrent section on the other hand to effectively reduce the fluid velocity, thereby reducing the impact on the main valve stem 130. On the other hand, the ellipsoidal chamber 1141 can increase the strength of the main valve body 110 and is convenient for processing and manufacturing.

[0062] Combined with Figure 3 、 Figure 6 and Figure 8As shown, in some embodiments, a limit top block receiving bin 142 is provided on the top surface of the main valve core 140; when the main valve core 140 cooperates with the valve seat 111, the inlet of the limit top block receiving bin 142 is correspondingly communicated with the limit block channel 152. The limit top block receiving bin 142 can receive the limit top block 157 pushed into the main valve cavity by the push block 155 when the main valve core 140 drops to the valve seat 111, vacating the position blocking the limit top block 157, so as to prevent the limit top block 157 from affecting the normal operation of the stop valve after self-repair.

[0063] Combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, in some embodiments, the telescopic assembly includes at least two telescopic mechanisms 163 evenly distributed around the outer section of the main valve stem; the telescopic mechanism 163 includes a telescopic upper connecting rod 1631 and a telescopic lower connecting rod 1632. The proximal ends of the telescopic upper connecting rod 1631 and the telescopic lower connecting rod 1632 are movably connected by a hinge shaft 1633 with a torsion spring, and the distal ends of the telescopic upper connecting rod 1631 and the telescopic lower connecting rod 1632 are respectively hinged to the telescopic upper platform 161 and the telescopic lower platform 162. The "proximal end" and "distal end" are determined according to the relative position relationship between the telescopic upper connecting rod 1631 and the telescopic lower connecting rod 1632. The telescopic mechanism 163 has the advantages of simple structure, convenient installation and maintenance, etc. It mainly drives the telescopic upper connecting rod 1631 and the telescopic lower connecting rod 1632 to expand and contract through the elastic force of the torsion spring; when the telescopic mechanism 163 is in a compressed state, the distance between the telescopic upper connecting rod 1631 and the telescopic lower connecting rod 1632 is relatively far, as Figure 1 shown; when the telescopic mechanism 163 is in an extended state, the distance between the telescopic upper connecting rod 1631 and the telescopic lower connecting rod 1632 is relatively close, as Figure 7 and Figure 8 shown.

[0064] Combined with Figure 1 , Figure 9 and Figure 10As shown, in some embodiments, two adjacent telescopic mechanisms 163 are connected by a telescopic component self-locking mechanism 166. The telescopic component self-locking mechanism 166 includes a limit constraint cylinder 1661 and a limit constraint rod 1666. The inner cavity of the limit constraint cylinder 1661 is sequentially divided into a movable connection cavity section 1662, a transition cavity section 1663, and a limit constraint cavity section 1664 from the cylinder opening inward. The cross-sectional dimension of the limit constraint cavity section 1664 is larger than that of the transition cavity section 1663, and a limit end face 1665 is formed at the connection between the transition cavity section 1663 and the limit constraint cavity section 1664. A self-locking elastic block 1667 that can radially expand and contract is arranged on the side wall of the head end of the limit constraint rod 1666, and a elastic block spring 1668 is arranged between the self-locking elastic block 1667 and the limit constraint rod 1666. The limit constraint cylinder 1661 is connected to one of the telescopic mechanisms 163, and its cylinder opening faces the other telescopic mechanism 163. The tail end of the limit constraint rod 1666 is connected to the other telescopic mechanism 163, and its head end is embedded in the movable connection cavity section 1662. When the telescopic mechanism 163 is fully extended, two adjacent telescopic mechanisms 163 approach relatively. The head end of the limit constraint rod 1666 passes through the transition cavity section 1663 and extends into the limit constraint cavity section 1664, and the self-locking elastic block 1667 extends and is stuck at the limit end face 1665 under the elastic force of the elastic block spring 1668. When the main valve stem 130 is intact, the telescopic component self-locking mechanism 166 remains in the open state, that is, the head end of the limit constraint rod 1666 is embedded in the movable connection cavity section 1662. At this time, the telescopic component self-locking mechanism 166 does not restrict the telescopic mechanism 163. After the main valve stem 130 breaks, the telescopic mechanism 163 gradually extends to drive the telescopic lower platform 162 to drive the redundant valve stem 164 and the main valve core gripper 165 to move downward. When the main valve core gripper 165 is cooperatively connected with the main valve core 140 that has fallen to the valve seat 111, at this time, the telescopic mechanism 163 is fully extended, and the telescopic component self-locking mechanism 166 forms a self-lock, ensuring that the telescopic mechanism 163 remains in the extended state, and both the telescopic lower platform 162 and the redundant valve stem 164 are fixed relative to the position of the telescopic upper platform 161. Thus, the redundant valve stem mechanism 160 can transmit the driving force of the actuator to the main valve core 140 for overcurrent control. By arranging the telescopic component self-locking mechanism 166, the reliability and stability of the redundant valve stem mechanism 160 are improved.

[0065] To ensure the convenience and firmness of the connection and facilitate the self-locking of the telescopic component self-locking mechanism 166 by using the change in the distance between two adjacent telescopic mechanisms 163 when the telescopic mechanism 163 extends, in some embodiments, the limit constraint cylinder 1661 is connected to the telescopic lower connecting rod 1632 of one of the telescopic mechanisms 163, and its cylinder opening faces the telescopic lower connecting rod 1632 of the other telescopic mechanism 163. The tail end of the limit constraint rod 1666 is connected to the telescopic lower connecting rod 1632 of the other telescopic mechanism 163.

[0066] Combined withFigure 9 and Figure 10 As shown in Figure 10 , in some embodiments, the limit constraint rod 1666 has a positioning cylinder nested and fitted with the limit constraint cylinder 1661, so as to facilitate the mating connection between the limit constraint rod 1666 and the limit constraint cylinder 1661.

[0067] In order to improve the stability and reliability of locking, in some embodiments, there are at least three self-locking elastic blocks 1667, which are evenly distributed around the axis of the limit constraint rod 1666; an unlocking port communicating with the limit constraint cavity section 1664 is provided on the limit constraint cylinder 1661, so as to facilitate a tool to extend in and press down the self-locking elastic blocks 1667 for unlocking operation.

[0068] Combined with Figure 2 and Figure 7 As shown in Figure 7 , in some embodiments, an L-shaped groove 143 is formed in the main valve core 140. There are at least two L-shaped grooves 143, which are evenly distributed around the axis of the main valve core 140. A guiding and anti-rotation structure is provided between the side wall of the main valve core 140 and the wall of the main valve cavity; the main valve core gripper 165 has an L-shaped claw 1651 that can be embedded in and cooperate with the L-shaped groove 143; the number of the L-shaped claws 1651 is equal to that of the L-shaped grooves 143 and they are arranged in one-to-one correspondence; the telescopic upper platform 161 is rotatably arranged on the outer section of the main valve rod; a gripper driving mechanism capable of driving the telescopic upper platform 161 to rotate is provided on the main valve body 110. After the L-shaped claw 1651 is embedded in the L-shaped groove 143, the gripper driving mechanism can drive the telescopic upper platform 161 to drive the main valve core gripper 165 to rotate, so that the L-shaped claw 1651 is engaged with the L-shaped groove 143. Among them, the width of the horizontal claw section of the L-shaped claw 1651 is generally smaller than the width of the vertical groove section of the L-shaped groove 143, so that it can be embedded into the L-shaped groove 143; usually, after the L-shaped claw 1651 is embedded in the L-shaped groove 143, it needs to rotate a certain angle to make its horizontal claw section embedded in the horizontal groove section of the L-shaped groove 143 to form a fit; usually, an inclined or arc-shaped guiding surface can be provided on the bottom surface of the L-shaped groove 143 to guide the L-shaped claw 1651 embedded therein, so that it can continuously achieve the actions of embedding and rotational fit. The gripper driving mechanism can be various, for example: a trigger type spring mechanism, a trigger type torsion spring mechanism, a servo motor, etc.; the gripper driving mechanism can be triggered by a trigger mechanism, and the triggering part of the trigger mechanism corresponds to the limit frame 158 that has fallen in place; after the limit frame 158 has fallen in place, the gripper driving mechanism drives the telescopic upper platform 161 to rotate, and then the telescopic upper platform 161 transmits the rotational action to the telescopic lower platform 162 through the telescopic mechanism 163, and then the telescopic lower platform 162 drives the redundant valve rod 164 to drive the main valve core gripper 165 to rotate.

[0069] The guiding and anti-rotation structure can prevent the main spool valve 140 from rotating and guide it up and down. It can be various structures such as a guide rail structure, a guide groove structure, a spline structure, etc. To simplify the structure and ensure the guiding and anti-rotation effects, in combination with Figure 2 、 Figure 3 and Figure 8 As shown, in some embodiments, the guiding and anti-rotation structure includes an axial guide groove 112 opened on the wall of the main valve cavity, and an anti-rotation rib 144 provided on the side wall of the main spool valve 140 and slidably engaged with the axial guide groove 112.

[0070] In combination with Figure 2 、 Figure 5 and Figure 7 As shown, in some embodiments, a lock block groove 145 is opened at the rear side of the bottom surface of the L-shaped groove 143. A redundant valve stem lock block 146 is movably arranged in the lock block groove 145, and a lock block spring 147 is arranged between the redundant valve stem lock block 146 and the bottom surface of the lock block groove 145; when the L-shaped claw 1651 is embedded in the L-shaped groove 143, the L-shaped claw 1651 can press the redundant valve stem lock block 146 downward into the lock block groove 145 and make the lock block spring 147 in a compressed state; when the embedded L-shaped claw 1651 rotates a certain angle in the L-shaped groove 143 to cooperate with it, a rear space will be vacated. At this time, the redundant valve stem lock block 146 extends into the L-shaped groove 143 under the elastic force of the lock block spring 147 and blocks behind the L-shaped claw 1651, thereby improving the stability of the connection between the redundant valve stem 164 and the main spool valve 140 through the main spool valve gripper 165 and ensuring the use effect after the valve stem self-repairs.

[0071] Combined with Figure 1 、 Figure 3 and Figure 8 As shown, in some embodiments, there are two valve stem fracture self-sensing mechanisms 150, which are symmetrically arranged on the main valve body 110 to improve the structural stability and reliability of the stop valve.

[0072] Combined with Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 and Figure 8As shown, in some embodiments, the main valve 100 further includes a main valve stroke limiting mechanism 170 disposed on the main valve body 110 for limiting the stroke of the main valve stem 130; the main valve stroke limiting mechanism 170 includes a stroke limiting ring 172 disposed on the main valve body 110 through a stroke limiting bracket 171, and a stroke limiting block 173 is disposed on the stroke limiting ring 172 directly below the telescopic upper platform 161. The structure of the main valve stroke limiting mechanism 170 is simple. By limiting the descending height of the telescopic upper platform 161, the working stroke of the main valve stem 130 and / or the redundant valve stem 164 can be limited to ensure that during the normal operation of the main valve 100, the main valve core 140 can always move in the second cavity section 114 for flow control. The number of the stroke limiting blocks 173 can be determined as needed. For example: Figure 1 In the embodiment, two symmetrically distributed stroke limiting blocks 173 are provided. In some embodiments, multiple stroke limiting blocks 173 evenly distributed on the stroke limiting ring 172 are usually provided.

[0073] Combined with Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, in some embodiments, the secondary valve 200 includes a secondary valve body 210, a secondary valve cover 220, a secondary valve gate 230 and a secondary valve stem 240; a secondary valve cavity 211 is provided inside the secondary valve body 210, a secondary valve inlet 212 and a secondary valve outlet 213 respectively communicating with the secondary valve cavity 211 are provided on the side of the secondary valve body 210, and a secondary valve top port 214 communicating with the secondary valve cavity 211 is provided on the top of the secondary valve body 210; the secondary valve cover 220 is sealingly disposed at the secondary valve top port 214; the secondary valve gate 230 is disposed in the secondary valve cavity 211; the secondary valve stem 240 is vertically disposed through the secondary valve cover 220 and is connected to the secondary valve gate 230; the secondary valve stem 240 can drive the secondary valve gate 230 to move up and down to switch the secondary valve inlet 212 and the secondary valve outlet 213 between a communicating state and a cut-off state. The secondary valve 200 is a gate valve, and its structure is relatively simple and clear, which is convenient for manufacturing, installation and maintenance, and has high reliability, which is beneficial to effectively controlling the fluid when the main valve 100 fails.

[0074] The description of the various embodiments of the present invention is presented herein for illustrative purposes only and is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used herein are chosen to best explain the principles of the embodiments, the practical application, or the technological advancement compared to the technologies found in the market, or to enable other skilled artisans in the field to understand the embodiments disclosed herein.

[0075] It should be understood that, for clarity, certain features of the invention described in the context of separate embodiments may also be provided in combination in a single embodiment. Conversely, for brevity, the various features of the invention described in the context of a single embodiment may also be provided separately or in any suitable sub-combination, or, where appropriate, in any other described embodiment of the invention. Certain features described in the context of various embodiments are not to be considered essential features of those embodiments unless the embodiment cannot function without those features.

[0076] All publications, patents, and patent applications mentioned herein are hereby incorporated by reference in their entirety as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference. Additionally, the citation or identification of any reference in this text should not be construed as an admission that such reference is available as prior art to the present invention. With respect to the use of section headings, the section headings should not be construed as necessarily limiting.

Claims

1. A primary and secondary coordinated tough stop valve with self-recoverable valve stem, characterized in that: The invention comprises a main valve (100) and a secondary valve (200); the main valve (100) comprises a main valve body (110), a main valve cover (120), a main valve stem (130), a main valve core (140), a valve stem fracture self-sensing mechanism (150) and a redundant valve stem mechanism (160); A main valve cavity is provided inside the main valve body (110), a valve seat (111) is formed at the bottom of the main valve cavity, the main valve cavity is connected upward to the top surface of the main valve body (110), and a main valve top opening is formed on the top surface of the main valve body (110); the main valve cavity is divided into a first cavity section (113), a second cavity section (114) and a third cavity section (115) from top to bottom; the second cavity section (114) has an ellipsoidal cavity (1141), and the ellipsoidal cavity (1141) is ) has a cross-sectional dimension greater than that of other parts of the second cavity section (114); the bottom of the main valve body (110) is provided with a main valve first inlet (116) connected to the third cavity section (115); the side of the main valve body (110) is provided with a main valve first outlet (117) connected to the third cavity section (115), and a main valve second inlet (118) and a main valve second outlet (119) respectively connected to the ellipsoidal chamber (1141); The main valve cover (120) is sealingly arranged at the top opening of the main valve; The main valve stem (130) is vertically arranged to pass through the main valve cover (120), and the lower part of the main valve stem (130) extends into the main valve cavity; the stem section of the main valve stem (130) outside the main valve cavity is the main valve stem outer section; The main valve core (140) is movably arranged in the second cavity section (114) and connected to the lower end of the main valve stem (130); the main valve stem (130) can drive the main valve core (140) to move up and down in the second cavity section (114), so that the first inlet (116) of the main valve and the second outlet (119) of the main valve are switched between a connected state and a cut-off state; a valve core flow channel (141) is provided on the main valve core (140); when the main valve core (140) cooperates with the valve seat (111), the valve core flow channel (141) can connect the first inlet (116) of the main valve with the first outlet (117) of the main valve; The valve stem fracture self-sensing mechanism (150) comprises a push block chamber (151) formed in the cavity wall of the main valve cavity, a limit block channel (152) connecting the push block chamber (151) with the second cavity section (114), a limit frame channel (153) extending from the top surface of the push block chamber (151) to the top surface of the main valve body (110), a push block (155) having a groove (154) and movably arranged in the push block chamber (151), and a push block (155) arranged in the push block chamber (151) and located between the cavity wall surface on the outside of the push block chamber (151) and the push block (155). The push block spring (156), the limit top block (157) and the limit frame (158) are arranged in the limit block channel (152); the limit top block (157) is movably arranged in the limit block channel (152), one end of which is in contact with the main valve core (140) and the other end of which is in contact with the push block (155), and the push block spring (156) is in a compressed state, and the lower opening of the limit frame channel (153) is staggered with the notch of the drop groove (154); the lower part of the limit frame (158) is embedded in the limit frame channel (153), and the lower end of the limit frame (158) is in contact with the top surface of the push block (155); The redundant valve stem mechanism (160) comprises a telescopic upper platform (161), a telescopic lower platform (162), a telescopic assembly, a redundant valve stem (164) and a main valve core gripper (165); the telescopic upper platform (161) is arranged on the outer section of the main valve stem; the telescopic lower platform (162) is slidably arranged on the outer section of the main valve stem and is located at the lower side of the telescopic upper platform (161) and is supported by a limit frame (158); the telescopic assembly is arranged between the telescopic upper platform (161) and the telescopic lower platform (162) and is in a compressed state; the redundant valve stem (164) is in a cylindrical shape. The main valve stem (130) is sleeved on the main valve stem (130), the upper end of which is connected to the telescopic lower platform (162), and the lower end of which extends into the first cavity section (113); the main valve core gripping clamp (165) is arranged in the first cavity section (113) and is connected to the lower end of the redundant valve stem (164); under normal working conditions of the stop valve, the main valve core gripping clamp (165) is in the first cavity section (113) and does not interfere with the normal operation of the main valve (100); when the main valve stem (130) is broken, the main valve core gripping clamp (165) can be connected to the main valve core (140) that has fallen to the valve seat (111); The secondary valve (200) comprises a secondary valve inlet (212), a secondary valve outlet (213) and a secondary valve stem (240); the secondary valve inlet (212) is connected to the first outlet (117) of the main valve via a primary-secondary valve connecting pipe (310), and the secondary valve outlet (213) is connected to the second inlet (118) of the main valve; the secondary valve stem (240) is connected to the main valve stem (130) via a primary-secondary valve linkage plate (320).

2. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 1, characterized in that: A limit block receiving chamber (142) is provided on the top surface of the main valve core (140); when the main valve core (140) is matched with the valve seat (111), the inlet of the limit block receiving chamber (142) is correspondingly connected to the limit block channel (152).

3. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 1, characterized in that: The telescopic assembly comprises at least two telescopic mechanisms (163) evenly distributed around the outer section of the main valve stem; the telescopic mechanism (163) comprises a telescopic upper connecting rod (1631) and a telescopic lower connecting rod (1632); the proximal ends of the telescopic upper connecting rod (1631) and the telescopic lower connecting rod (1632) are movably connected to each other via a hinge shaft (1633) with a torsion spring, and the distal ends of the telescopic upper connecting rod (1631) and the telescopic lower connecting rod (1632) are respectively hinged to the telescopic upper platform (161) and the telescopic lower platform (162).

4. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 3, characterized in that: Two adjacent telescopic mechanisms (163) are connected via a telescopic assembly self-locking mechanism (166), wherein the telescopic assembly self-locking mechanism (166) comprises a position limiting constraint cylinder (1661) and a position limiting constraint rod (1666); The inner cavity of the position-limiting and constraining cylinder (1661) is divided into a movable connection cavity section (1662), a transition cavity section (1663) and a position-limiting and constraining cavity section (1664) in sequence from the cylinder mouth inwards; the cross-sectional dimension of the position-limiting and constraining cavity section (1664) is larger than the cross-sectional dimension of the transition cavity section (1663); a position-limiting end surface (1665) is formed at the connection between the transition cavity section (1663) and the position-limiting and constraining cavity section (1664); A radially retractable self-locking spring block (1667) is provided on the side wall of the head end of the position limiting and restraining rod (1666), and a spring block spring (1668) is provided between the self-locking spring block (1667) and the position limiting and restraining rod (1666); The limit constraint tube (1661) is connected to one of the telescopic mechanisms (163), and its tube mouth faces the other telescopic mechanism (163); the tail end of the limit constraint rod (1666) is connected to the other telescopic mechanism (163), and its head end is embedded in the movable connection cavity section (1662); when the telescopic mechanism (163) is fully extended, the two adjacent telescopic mechanisms (163) are relatively close, and the head end of the limit constraint rod (1666) passes through the transition cavity section (1663) and extends into the limit constraint cavity section (1664), and under the elastic force of the spring block spring (1668), the self-locking spring block (1667) extends out and is stuck at the limit end surface (1665).

5. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 4, characterized in that: The number of the self-locking spring blocks (1667) is at least three and they are evenly distributed around the axis of the position limiting constraint rod (1666); The position limiting and restraining cylinder (1661) is provided with an unlocking port which is in communication with the position limiting and restraining cavity section (1664).

6. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 1, characterized in that: The main valve core (140) is provided with an L-shaped groove (143), the L-shaped grooves (143) being at least two and evenly distributed around the axis of the main valve core (140), and a guide anti-rotation structure being provided between the side wall of the main valve core (140) and the cavity wall of the main valve cavity; The main valve core gripper (165) has an L-shaped claw (1651) that can be embedded in the L-shaped groove (143) and cooperate therewith; the number of the L-shaped claws (1651) is equal to the number of the L-shaped grooves (143), and is arranged in a one-to-one correspondence therewith; The telescopic upper platform (161) is rotatably arranged on the outer section of the main valve stem; the main valve body (110) is provided with a gripping driving mechanism capable of driving the telescopic upper platform (161) to rotate; the gripping driving mechanism can drive the telescopic upper platform (161) to drive the main valve core gripping clamp (165) to rotate after the L-shaped claw (1651) is embedded in the L-shaped groove (143), so that the L-shaped claw (1651) and the L-shaped groove (143) are matched together.

7. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 6, characterized in that: A locking block groove (145) is provided at the rear side of the groove bottom surface of the L-shaped groove (143), and a redundant valve stem locking block (146) is movably arranged in the locking block groove (145), and a locking block spring (147) is arranged between the redundant valve stem locking block (146) and the groove bottom surface of the locking block groove (145); when the L-shaped claw (1651) is embedded in the L-shaped groove (143) and cooperates therewith, the redundant valve stem locking block (146) extends into the L-shaped groove (143) under the elastic force of the locking block spring (147) and is blocked at the rear side of the L-shaped claw (1651).

8. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 1, characterized in that: There are two valve stem fracture self-sensing mechanisms (150), which are symmetrically arranged on the main valve body (110); The main valve (100) further comprises a main valve stroke limiting mechanism (170) arranged on the main valve body (110) and used for limiting the stroke of the main valve stem (130); The main valve stroke limit mechanism (170) comprises a stroke limit ring (172) arranged on the main valve body (110) via a stroke limit bracket (171), and the stroke limit ring (172) is provided with a stroke limit block (173) located directly below the telescopic upper platform (161).

9. A primary-secondary coordinated tough stop valve with self-recoverable valve stem according to any one of claims 1 to 8, characterized in that: The secondary valve (200) comprises a secondary valve body (210), a secondary valve cover (220), a secondary valve gate (230) and a secondary valve stem (240); A secondary valve cavity (211) is provided inside the secondary valve body (210), a secondary valve inlet (212) and a secondary valve outlet (213) respectively connected to the secondary valve cavity (211) are provided on the side of the secondary valve body (210), and a secondary valve top port (214) connected to the secondary valve cavity (211) is provided on the top of the secondary valve body (210); The secondary valve cover (220) is sealingly arranged at the secondary valve top opening (214); The secondary valve gate (230) is arranged in the secondary valve chamber (211); The secondary valve stem (240) is vertically disposed through the secondary valve cover (220) and is connected to the secondary valve gate (230); the secondary valve stem (240) can drive the secondary valve gate (230) to move up and down, so that the secondary valve inlet (212) and the secondary valve outlet (213) are switched between a connected state and a cut-off state.

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