Primary and secondary synergistic flexible stop valve with valve rod capable of being self-recovered

Abstract

The invention discloses a primary and secondary synergistic flexible stop valve with a self-recovery valve rod, relates to the technical field of valves, and aims to solve the problems of how to find a breakage fault of the valve rod in time and how to recover the function of the valve rod automatically. The stop valve comprises a main valve and a secondary valve, wherein the main valve mainly comprises a main valve body, a main valve cover, a main valve rod, a main valve core, a valve rod fracture self-sensing mechanism and a redundant valve rod mechanism; through the arranged valve rod breakage self-sensing mechanism, automatic identification can be achieved when the main valve rod is broken and the main valve element falls to the valve seat; through the arranged redundant valve rod mechanism, after the valve rod fracture self-sensing mechanism recognizes that the main valve rod is fractured, the redundant valve rod can be controlled to replace the main valve rod to be connected with the main valve element, self-recovery of the function of the valve rod is achieved, and the toughness of the structural layer of the stop valve is guaranteed; the secondary valve can replace the main valve to carry out overflowing control after the main valve rod is broken and before self-repairing, so that the stop valve keeps the original function without losing, and the toughness of the functional level of the stop valve is ensured.

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; 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; The main valve cover is sealed at the top of the main valve; 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; 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; 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; The redundant valve stem mechanism comprises a telescopic upper platform, a telescopic lower platform, a telescopic assembly, a redundant valve stem and a main valve core grabbing clamp; 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, and is located at the lower side of the telescopic upper platform, and is supported by a limit 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 cylindrical, which is sleeved on the main valve stem, and its upper end is connected to the telescopic lower platform, and its lower end extends into the first cavity section; the main valve core grabbing clamp can be connected with the main valve core, which is arranged in the first cavity section and connected to the lower end of the redundant valve stem; 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.

[0007] Furthermore, the second cavity section has an ellipsoidal cavity, the cross-sectional dimension of the ellipsoidal cavity is larger than the cross-sectional dimension of other parts of the second cavity section; the second inlet of the main valve and the second outlet of the main valve are respectively connected to the ellipsoidal cavity.

[0008] Furthermore, a limit top block receiving chamber is provided on the top surface of the main valve core; when the main valve core cooperates with the valve seat, the inlet of the limit top block receiving chamber is correspondingly connected to the limit block channel.

[0009] Furthermore, 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 to each other 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.

[0010] Furthermore, two adjacent telescopic mechanisms are connected via a telescopic assembly self-locking mechanism, and the telescopic assembly self-locking mechanism includes a limit constraint cylinder and a limit constraint rod; The inner cavity of the position-limiting and constraining cylinder is divided into a movable connection cavity section, a transition cavity section and a position-limiting and constraining cavity section in sequence from the cylinder mouth inward, the cross-sectional dimension of the position-limiting and constraining cavity section is larger than the cross-sectional dimension of the transition cavity section, and a position-limiting end surface is formed at the connection between the transition cavity section and the position-limiting and constraining cavity section; A radially retractable self-locking spring block is arranged on the side wall of the limit constraint rod head end, and a spring block spring is arranged between the self-locking spring block and the limit constraint rod; The limit constraint cylinder is connected to one of the telescopic mechanisms, and its cylinder mouth faces the other telescopic mechanism; the tail end of the limit constraint 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 are relatively close, and the head end of the limit constraint rod passes through the transition cavity section and extends into the limit constraint cavity section, and under the elastic force of the spring block, the self-locking spring block extends out and is stuck at the limit end face.

[0011] Furthermore, the number of the self-locking spring blocks is at least three and they are evenly distributed around the axis of the limit constraint rod; The position limiting and restraining cylinder is provided with an unlocking port which is in communication with the position limiting and restraining cavity section.

[0012] Furthermore, the main valve core is provided with an L-shaped groove, the number of the L-shaped grooves being at least two and being evenly distributed around the axis of the main valve core, and a guide anti-rotation structure being provided between the side wall of the main valve core and the cavity wall of the main valve cavity; The main valve core gripper has an L-shaped claw that can be embedded in and matched with the L-shaped groove; the number of the L-shaped claws is equal to the number of the L-shaped grooves and is arranged one by one; The telescopic upper platform is rotatably arranged on the outer section of the main valve stem; the main valve body is provided with a gripping driving mechanism capable of driving the telescopic upper platform to rotate, and the gripping driving mechanism can drive the telescopic upper platform to drive the main valve core gripping 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.

[0013] Furthermore, a locking block groove is opened on the rear side of the bottom surface of the L-shaped groove, and a redundant valve stem locking block is movably arranged in the locking block groove, and a locking block spring is arranged between the redundant valve stem locking block and the bottom surface of the locking block groove; when the L-shaped claw is embedded in the L-shaped groove and cooperates with it, the redundant valve stem locking block extends into the L-shaped groove under the elastic force of the locking block spring and is blocked at the rear side of the L-shaped claw.

[0014] Furthermore, there are two valve stem fracture self-sensing mechanisms, which are symmetrically arranged on the main valve body; The main valve further comprises a main valve travel limiting mechanism arranged on the main valve body for limiting the travel of the main valve stem; The main valve stroke limit mechanism comprises a stroke limit ring arranged on the main valve body through a stroke limit bracket, and the stroke limit ring is provided with a stroke limit block located directly below the telescopic upper platform.

[0015] Further, the secondary valve comprises a secondary valve body, a secondary valve cover, a secondary valve gate and a secondary valve stem; A secondary valve cavity is provided inside the secondary valve body, a secondary valve inlet and a secondary valve outlet are provided on the side of the secondary valve body respectively connected to the secondary valve cavity, and a secondary valve top port is provided on the top of the secondary valve body connected to the secondary valve cavity; The secondary valve cover is sealed at the top of the secondary valve; The secondary valve gate is arranged in the secondary valve cavity; 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 are switched between a connected state and a cut-off state.

[0016] The beneficial effects of the present invention are as follows: the stop valve comprises a main valve and a secondary valve, and the main valve is mainly composed 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; by means of the valve stem fracture self-sensing mechanism, when the main valve stem breaks and causes the main valve core to fall to the valve seat, the position of the blocking limit top block is given up, so that the push block spring can push the push block to a position where the notch of the slot corresponds to the lower opening of the limit frame channel, and then the limit frame can fall into the slot, thereby realizing automatic identification of the valve stem fracture fault, with timely response and high reliability; by means of the redundant valve stem mechanism, when the limit frame falls into the slot and gives up the position of blocking the telescopic lower platform without disassembling the valve, the telescopic lower platform is driven by the telescopic assembly to drive the redundant valve stem and the main valve core clamp to move downward, thereby making the main The valve core clamp is connected to the main valve core that has fallen to the valve seat, so that the redundant valve stem can replace the main valve stem to be connected to the main valve core, thereby realizing self-recovery of the valve stem function and ensuring the toughness of the stop valve structure. Since the main valve stem can be self-repaired without disassembling the valve after it breaks, the convenience and speed of repair are greatly improved. The secondary valve is connected to the main valve through the main-secondary valve connecting pipe, and the secondary valve stem is connected to the main valve stem through the main-secondary valve linkage plate. Therefore, after the main valve stem breaks and before self-repair, the secondary valve can replace the main valve to perform flow control, so that the stop valve maintains its original function without losing its original function and ensures its toughness at the functional level. Moreover, after the main valve stem breaks, the stop valve can perform self-repair of the valve stem at the same time under normal working conditions without shutting down or stopping work, which is beneficial to ensuring production efficiency and greatly reducing operation and maintenance costs.

[0017] The technical effects brought about or directly produced by other technical features of the present invention will be described in detail in the subsequent specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional structural schematic diagram of the present invention; Figure 3 is along Figure 2 Sectional view along line AA; Figure 4 yes Figure 2 A partial enlarged view of point B in the middle; Figure 5 yes Figure 2 A partial enlarged view of point C in the middle; Figure 6 yes Figure 3 A partial enlarged view of point D in the middle; Figure 7 It is a schematic cross-sectional structure diagram of the main valve stem of the present invention after it is broken and self-repaired; Figure 8 is along Figure 7 Sectional view along line EE; Fig. 9 It is a schematic cross-sectional view of the self-locking mechanism of the telescopic assembly before self-locking in the present invention; Fig.10 It is a schematic cross-sectional view of the self-locking mechanism of the telescopic assembly after self-locking in the present invention; In the figure, the markings 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 chamber, 115-third cavity section, 116-first inlet of main valve, 117-first outlet of main valve, 118-second inlet of main valve, 119-second outlet of main valve, 120-main valve cover, 130-main valve stem, 140-main valve core, 141-valve core flow channel, 142-main valve core flow channel, 143-main valve core flow channel, 144-main valve core flow channel, 145-main valve core flow channel, 146-main valve core flow channel, 147-main valve core flow channel, 148-main valve core flow channel, 149-main valve core flow channel, 150-main valve core flow channel, 151-main valve core flow channel, 152-main valve core flow channel, 153-main valve core flow channel, 154-main valve core flow channel, 155-main valve core flow channel, 156-main valve core flow channel, 157-main valve core flow channel, 158-main valve core flow channel, 159-main valve core flow channel, 160-main valve core flow channel, 161- 2-limiting top block receiving bin, 143-L-shaped groove, 144-anti-rotation ridge, 145-locking block groove, 146-redundant valve stem locking block, 147-locking block spring, 150-valve stem fracture self-sensing mechanism, 151-push block chamber, 152-limiting block channel, 153-limiting frame channel, 154-drop groove, 155-push block, 156-push block spring, 157-limiting top block, 158-limiting frame, 160-redundant valve stem mechanism, 161-telescopic upper platform, 16 2-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 clamp, 1651-L-shaped claw, 166-telescopic assembly self-locking mechanism, 1661-limiting constraint cylinder, 1662-movable connection cavity section, 1663-transition cavity section, 1664-limiting constraint cavity section, 1665-limiting end face, 1666-limiting constraint rod, 1667 -Self-locking spring block, 1668-spring block spring, 170-main valve stroke limit mechanism, 171-stroke limit bracket, 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, 220-secondary valve cover, 230-secondary valve gate, 240-secondary valve stem, 310-main and secondary valve connecting pipe, 320-main and secondary valve linkage plate. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The same reference numerals in the accompanying drawings represent the same component, or components with the same function, or similar components. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings need not be drawn to scale unless otherwise specified.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positions, and dimensional relationships based on the directions or position relationships shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the referred device or component must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0021] In the description of the present invention, the term "toughness" refers to the ability of a device or component to restore its original function and purpose 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 "multiple" indicates a quantity, it usually refers to a quantity of three or more, for example, "multiple" usually refers to three or more. The expression "mainly composed of..." is interpreted as also containing structural components not mentioned in the sentence. The term "and / or" is only a kind of association relationship describing the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] Combination Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8 As shown, a primary-secondary coordinated tough stop valve with a self-recoverable 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; 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 upwardly connected 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; a main valve first inlet 116 communicating with the third cavity section 115 is provided at the bottom of the main valve body 110; a main valve first outlet 117 communicating with the third cavity section 115, and a main valve second inlet 118 and a main valve second outlet 119 respectively communicating with the second cavity section 114 are provided on the side of the main valve body 110; The main valve cover 120 is sealed at the top of the main valve to close the main valve cavity. The main valve cover 120 is generally connected and fixed to the main valve body 110 by screws, bolts and other connecting parts. A sealing gasket is generally provided between the main valve cover 120 and the main valve body 110 for sealing. 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 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, and 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 includes a push block chamber 151 opened 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 chamber wall surface disposed in the push block chamber 151 and located on the outer side of the push block chamber 151 and the push block 155 is connected to the push block chamber 151. The push block spring 156, the limit top block 157 and the limit frame 158 are arranged between the blocks 155; 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 by the side during the up and down movement of the main valve core 140 under normal working conditions; 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 is in contact with the push block 155 The lower end of the limit frame 158 is embedded in the limit frame channel 153, and the lower end thereof is in contact with the top surface of the push block 155; in order to ensure that the limit top block 157 is not blocked by the main valve core 140, it can be pushed by the push block 155. 55 pushes out the limit block channel 152, and a push block protrusion that can penetrate the limit block channel 152 is usually provided on the side of the push block 155; under normal working conditions, the push block protrusion part 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 toward the main valve cavity, and then the push block protrusion penetrates the limit block channel 152 to push out the limit top block 157; The redundant valve stem mechanism 160 includes 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 the limit frame 158; the telescopic lower platform 162 can be directly pressed on the upper end of the limit frame 158, or on the structural part connected to the upper end of the limit frame 158, and can also be directly or indirectly connected to the limit frame 158 and 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 or two The main valve stem 130 is composed of one 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 stem 164 is cylindrical, which is sleeved on the main valve stem 130, and its upper end is connected to the telescopic lower platform 162, and its lower end extends into the first cavity section 113; the main valve core grasping clamp 165 can be connected with the main valve core 140, which is arranged in the first cavity section 113 and connected to the lower end of the redundant valve stem 164; the main valve core grasping clamp 165 can be a grasping mechanism that can directly grasp the main valve core 140, or it can be 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 connection structure, etc.; The secondary valve 200 has 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 through the main-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 through the main-secondary valve linkage plate 320.

[0023] When the stop valve is under normal working conditions, that is, when the main valve stem 130 is not broken, since the main valve core 140 is always in contact with the wall surface of the main valve cavity within its stroke, the limit top block 157 is blocked by the main valve core 140 and is limited, 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 clamp 165 are not released, and the main valve core clamp 165 is in the first cavity section 113 and does not interfere with the normal operation of the main valve 100. When a valve stem fracture failure 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 cooperates with the valve seat 111; at this time, the main valve core 140 gives up the position of blocking the limit top block 157, and then the limit top block 157 no longer blocks the push block 155, and under the elastic force of the push block spring 156, the push block 155 is pushed to a position close to the main valve cavity, and when the notch of the drop groove 154 corresponds to the lower mouth of the limit frame channel 153, the limit frame 158 is not supported and falls into the drop groove 154; at the same time, the limit frame 158 The position originally supporting the telescopic lower platform 162 will be given up. The telescopic upper platform 161 will not move downward due to the connection of the primary and secondary valve linkage plate 320. The telescopic assembly in a compressed state will drive the telescopic lower platform 162 to drive the redundant valve stem 164 and the main valve core clamp 165 to move downward relative to the telescopic upper platform 161, thereby making the main valve core clamp 165 cooperate and connect with the main valve core 140 that falls to the valve seat 111, so that the redundant valve stem 164 can replace the main valve stem 130 to connect with the main valve core 140, thereby realizing the operation of automatically identifying and releasing the redundant valve stem 164 for self-repair after the main valve stem 130 is broken.

[0024] The overall toughness design of the stop valve mainly includes the structural toughness level and the functional toughness level. As for the structural toughness: First, by setting the valve stem fracture self-sensing mechanism 150, when the main valve stem 130 breaks and causes the main valve core 140 to fall to the valve seat 111, the position of the blocking limit top block 157 is released, so that the push block spring 156 can push the push block 155 to the position where the notch of the slot 154 corresponds to the lower mouth of the limit frame channel 153, and then the limit frame 158 can fall into the slot 154, realizing the automatic identification of the valve stem fracture fault, which not only responds promptly, but also the fault is only identified through the mechanical structure instead of the electrical components, and the reliability is high; secondly, by setting The redundant valve stem mechanism 160 does not require manual intervention such as disassembly, maintenance or replacement. When the limit frame 158 falls into the slot 154 to make way for 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 clamp 165 to move downward, so that the main valve core clamp 165 can be connected to the main valve core 140 that falls 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, thereby realizing the self-recovery of the valve stem function and ensuring the toughness of the stop valve structure. As for functional resilience: the secondary valve 200 is connected to the main valve 100 through the main-secondary valve connecting 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 perform flow control, so that the stop valve maintains its original function without losing it, ensuring the resilience at the functional level; moreover, after the main valve stem 130 breaks, the stop valve can simultaneously perform valve stem self-repair under normal working conditions without shutting down or stopping work, which is beneficial to ensuring production efficiency and greatly reducing operation and maintenance costs.

[0025] Combination 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 dimension of other parts of the second cavity section 114; the second inlet 118 of the main valve and the second outlet 119 of the main valve are respectively connected to the ellipsoidal chamber 1141. On the one hand, the ellipsoidal chamber 1141 is conducive to connecting the second inlet 118 of the main valve and the second outlet 119 of the main valve, and on the other hand, it can increase the area and spatial volume of the flow cross section to effectively reduce the speed of the fluid, thereby reducing the impact on the main valve stem 130, and on the other hand, the ellipsoidal chamber 1141 can increase the strength of the main valve body 110 and facilitate processing and manufacturing.

[0026] Combination Figure 3 , Figure 6 and Figure 8As shown, in some embodiments, a limit top 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 top block receiving chamber 142 is correspondingly connected to the limit block channel 152. When the main valve core 140 falls to the valve seat 111 and leaves the position to block the limit top block 157, the limit top block receiving chamber 142 can receive the limit top block 157 pushed into the main valve cavity by the push block 155, so as to prevent the limit top block 157 from affecting the normal operation of the stop valve after self-repair.

[0027] Combination 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 link 1631 and a telescopic lower link 1632, the proximal ends of the telescopic upper link 1631 and the telescopic lower link 1632 are movably connected to each other through a hinge shaft 1633 with a torsion spring, and the distal ends of the telescopic upper link 1631 and the telescopic lower link 1632 are hinged to the telescopic upper platform 161 and the telescopic lower platform 162 respectively. The "proximal end" and "distal end" are determined according to the relative positional relationship between the telescopic upper link 1631 and the telescopic lower link 1632. The telescopic mechanism 163 has the advantages of simple structure, easy installation and maintenance, etc. It mainly drives the telescopic upper link 1631 and the telescopic lower link 1632 to telescope through the elastic force of the torsion spring; when the telescopic mechanism 163 is in a compressed state, the distance between the telescopic upper link 1631 and the telescopic lower link 1632 is relatively far, such as Figure 1 When the telescopic mechanism 163 is in the extended state, the distance between the telescopic upper link 1631 and the telescopic lower link 1632 is relatively close, as shown in FIG. Figure 7 and Figure 8 shown.

[0028] Combination Figure 1 , Fig. 9 and Fig.10As shown, in some embodiments, two adjacent telescopic mechanisms 163 are connected by a telescopic assembly self-locking mechanism 166, and the telescopic assembly 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 divided into a movable connection cavity section 1662, a transition cavity section 1663 and a limit constraint cavity section 1664 from the cylinder mouth inward, and the cross-sectional size of the limit constraint cavity section 1664 is larger than the cross-sectional size of the transition cavity section 1663, and a limit end surface 1665 is formed at the connection between the transition cavity section 1663 and the limit constraint cavity section 1664; a radially retractable self-locking spring block 1666 is provided on the side wall of the head end of the limit constraint rod 1666. 667, a spring block spring 1668 is arranged between the self-locking spring block 1667 and the limiting constraint rod 1666; the limiting 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 limiting 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 limiting constraint rod 1666 passes through the transition cavity section 1663 and extends into the limiting 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 limiting end face 1665. When the main valve stem 130 is intact, the telescopic assembly self-locking mechanism 166 remains in an open state, that is, the head end of the limit constraint rod 1666 is embedded in the movable connection cavity section 1662, and the telescopic assembly self-locking mechanism 166 does not restrict the telescopic mechanism 163. When the main valve stem 130 is broken, 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 connected with the main valve core 140 that has fallen to the valve seat 111, the telescopic mechanism 163 is fully extended at this time, and the telescopic assembly self-locking mechanism 166 forms a self-locking, ensuring that the telescopic mechanism 163 remains in the extended state, and the telescopic lower platform 162 and the redundant valve stem 164 are both fixed relative to the telescopic upper platform 161, so that the redundant valve stem mechanism 160 can transmit the driving force of the actuator to the main valve core 140 to control the flow. The reliability and stability of the redundant valve stem mechanism 160 are improved by setting the telescopic assembly self-locking mechanism 166.

[0029] In order to ensure the convenience and stability of the connection, and to facilitate the change in the distance between two adjacent telescopic mechanisms 163 when the telescopic mechanism 163 is extended to drive the telescopic assembly self-locking mechanism 166 to complete self-locking, in some embodiments, the limit constraint cylinder 1661 is connected to the telescopic lower link 1632 of one of the telescopic mechanisms 163, and its cylinder mouth faces the telescopic lower link 1632 of the other telescopic mechanism 163; the tail end of the limit constraint rod 1666 is connected to the telescopic lower link 1632 of the other telescopic mechanism 163.

[0030] Combination Fig. 9 and Fig.10 As shown, in some embodiments, the limiting constraint rod 1666 has a positioning tube that is nested and matched with the limiting constraint tube 1661, so that the limiting constraint rod 1666 and the limiting constraint tube 1661 can be matched and connected.

[0031] In order to improve the stability and reliability of locking, in some embodiments, the self-locking spring blocks 1667 are at least three and are evenly distributed around the axis of the limiting constraint rod 1666; the limiting constraint cylinder 1661 is provided with an unlocking port connected to the limiting constraint cavity section 1664, so that a tool can be inserted to press down the self-locking spring block 1667 to perform the unlocking operation.

[0032] Combination Figure 2 and Figure 7 As shown, in some embodiments, an L-shaped groove 143 is provided on the main valve core 140, and there are at least two L-shaped grooves 143, which are evenly distributed around the axis of the main valve core 140, and a guiding anti-rotation structure is provided between the side wall of the main valve core 140 and the cavity wall of the main valve cavity; the main valve core grasping clamp 165 has an L-shaped claw 1651 that can be embedded in the L-shaped groove 143 and cooperate with it; the number of L-shaped claws 1651 is equal to the number of L-shaped grooves 143, and is arranged one by one corresponding to each other; the telescopic upper platform 161 is rotatably arranged on the outer section of the main valve stem; a grasping clamp driving mechanism that can drive the telescopic upper platform 161 to rotate is provided on the main valve body 110, and the grasping clamp driving mechanism can drive the telescopic upper platform 161 to drive the main valve core grasping 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. 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 in the L-shaped groove 143; usually after the L-shaped claw 1651 is embedded in the L-shaped groove 143, it needs to be rotated a certain angle so that the horizontal claw section can be embedded in the horizontal groove section of the L-shaped groove 143 to form a fit; usually, an inclined or arc-shaped guide surface can be set on the bottom surface of the L-shaped groove 143 to guide the L-shaped claw 1651 embedded therein, so that it can realize the embedding and rotation fit actions in a continuous manner. The gripping driving mechanism can be of various types, for example: a triggered spring mechanism, a triggered torsion spring mechanism, a servo, etc.; the gripping 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 into place; after the limit frame 158 has fallen into place, the gripping 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 stem 164 to drive the main valve core gripping clamp 165 to rotate.

[0033] The guide anti-rotation structure can prevent the main valve core 140 from rotating and guide it up and down. It can be a guide rail structure, a guide groove structure, a spline structure, etc. In order to simplify the structure and ensure the guiding and anti-rotation effects, the guide anti-rotation structure is combined with the guide rail structure. Figure 2 , Figure 3 and Figure 8 As shown, in some embodiments, the guide anti-rotation structure includes an axial guide groove 112 opened on the cavity wall of the main valve cavity, and an anti-rotation ridge 144 provided on the side wall of the main valve core 140 and slidably matched with the axial guide groove 112.

[0034] Combination Figure 2 , Figure 5 and Figure 7 As shown, in some embodiments, a locking block groove 145 is opened on the rear side of the 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 bottom surface of the locking 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 locking block 146 downward into the locking block groove 145, and make the locking 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, it will make room on the rear side, at this time, 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 blocks the rear side of the L-shaped claw 1651, thereby improving the stability of the redundant valve stem 164 connected to the main valve core 140 through the main valve core clamp 165, and ensuring the use effect of the valve stem after self-repair.

[0035] Recombination 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.

[0036] Recombination 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 and is located directly below the telescopic upper platform 161. The main valve stroke limiting mechanism 170 has a simple structure and can limit the working stroke of the main valve stem 130 and / or the redundant valve stem 164 by limiting the descending height of the telescopic upper platform 161, thereby ensuring that during the normal operation of the main valve 100, the main valve core 140 can always move in the second chamber section 114 to perform flow control. The number of stroke limiting blocks 173 can be determined as needed, for example: Figure 1 In the embodiment, two symmetrically distributed travel limit blocks 173 are provided. In some embodiments, a plurality of travel limit blocks 173 evenly distributed on the travel limit ring 172 are generally provided.

[0037] Recombination 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, and 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 sealed at the secondary valve top port 214; the secondary valve gate 230 is arranged in the secondary valve cavity 211; the secondary valve stem 240 is vertically passed 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. The secondary valve 200 is a gate valve, which has a relatively simple and clear structure, is easy to manufacture, install and maintain, and has high reliability, which helps to ensure that the stop valve can effectively control the fluid when the main valve 100 fails.

[0038] The description of 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 selected to best explain the principles, practical applications, or technological advances of the embodiments, or to enable other persons skilled in the art to understand the embodiments disclosed herein, compared to the technology found on the market.

[0039] It should be understood that certain features of the invention described in the context of separate embodiments for the sake of clarity may also be provided in combination in a single embodiment. Conversely, various features of the invention described in the context of a single embodiment for the sake of brevity may also be provided individually or in any suitable sub-combination, or in any other described embodiment of the invention where appropriate. Certain features described in the context of various embodiments are not considered essential features of those embodiments unless the embodiments would not function without those features.

[0040] All publications, patents, and patent applications mentioned herein are incorporated herein by reference in their entirety, to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated as being incorporated herein by reference. In addition, the citation or identification of any reference herein should not be construed as an admission that such reference is available as prior art to the present invention. To the extent that section headings are used, 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 upwardly connected 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; a main valve first inlet (116) communicating with the third cavity section (115) is provided at the bottom of the main valve body (110); a main valve first outlet (117) communicating with the third cavity section (115), and a main valve second inlet (118) and a main valve second outlet (119) respectively communicating with the second cavity section (114) are provided on the side of the main valve body (110); 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 on the telescopic upper platform (161) and the redundant valve stem (164) is supported by a limit frame (158); The redundant valve stem (164) is in a cylindrical shape and is sleeved on the main valve stem (130). The upper end of the redundant valve stem (164) is connected to the telescopic lower platform (162) and the lower end of the redundant valve stem (164) extends into the first cavity section (113). The main valve core gripper (165) can be connected to the main valve core (140) and is arranged in the first cavity section (113) and connected to the lower end of the redundant valve stem (164). 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: The second cavity section (114) has an ellipsoidal cavity (1141), the cross-sectional dimensions of the ellipsoidal cavity (1141) being larger than the cross-sectional dimensions of other parts of the second cavity section (114); the second inlet (118) of the main valve and the second outlet (119) of the main valve are respectively connected to the ellipsoidal cavity (1141).

3. 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).

4. 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).

5. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 4, 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).

6. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 5, 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).

7. 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.

8. A primary and secondary coordinated tough stop valve with self-recoverable valve stem according to claim 7, 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).

9. 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).

10. A primary-secondary coordinated tough stop valve with self-recoverable valve stem according to any one of claims 1 to 9, 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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