A multi-stage pressure reducing gate valve for extreme pressure conditions

Abstract

The present invention relates to the technical field of pressure relief valves, and specifically relates to a multi-stage pressure relief gate valve for extreme pressure conditions, including a first valve seat and a plurality of second valve seats. A gate plate is arranged in the first valve seat. The second valve seat includes a tee pipe and an elbow pipe. The tee pipe is composed of a first horizontal pipe, a second horizontal pipe, and a first vertical pipe. A balance piston and a first spring are coaxially arranged in the second horizontal pipe. An adjusting sleeve is sleeved outside the second horizontal pipe. A limiting cylinder at the axis of the adjusting sleeve is inserted into the second horizontal pipe. A triggering mechanism is arranged on the adjusting sleeve. An upstream pressure relief cavity is arranged on the first horizontal pipe. A pressure relief valve core and a locking slider are arranged in the upstream pressure relief cavity. This technical solution adopts a series connection of one first valve seat and multiple second valve seats, and adjusts the maximum pressure relief effect in each second valve seat by adjusting the adjusting sleeve on each second valve seat, so as to achieve precise pressure relief adjustment under different pressure conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure relief valves, and specifically relates to a multi-stage pressure relief gate valve for extreme pressure conditions. Background Art

[0002] In industrial production and engineering applications, liquid transportation systems under extreme pressure conditions pose extremely high requirements for the pressure relief ability and stability of valves. Traditional pressure relief valves can usually only handle a limited pressure range. When the pressure exceeds the designed range, it is easy to cause system failures, and even cause equipment damage and safety hazards. Therefore, it is particularly important to design a multi-stage pressure relief valve that can operate stably under extreme pressure conditions.

[0003] Chinese Patent CN118499539B discloses a multi-stage pressure relief gate valve for extreme pressure conditions, including a first pressure relief valve body and a second pressure relief valve body. Through the design of a multi-stage pressure relief structure, efficient pressure relief in a high-pressure environment is achieved. However, the structures of each valve body of this device are different, and the degrees of pressure relief are different. Therefore, the accuracy requirements for its installation and assembly are relatively high, and a large number of components are required for maintenance and replacement, which also requires higher technical requirements for installers. Under extreme pressure conditions, the quality requirements for each component are relatively high. Once a problem occurs, it is also relatively difficult to troubleshoot damaged components. Summary of the Invention

[0004] In view of the above problems, it is necessary to provide a multi-stage pressure relief gate valve for extreme pressure conditions for the above technical problems.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] A multi-stage pressure reducing gate valve for extreme pressure conditions, comprising a first valve seat and a plurality of second valve seats. A gate plate is arranged in the first valve seat. The second valve seat includes a tee pipe and an elbow pipe. The tee pipe is composed of a first horizontal pipe and a second horizontal pipe arranged coaxially and a first vertical pipe extending radially along the first horizontal pipe. The first vertical pipe is communicated with the elbow pipe. Connecting flanges are arranged on the first horizontal pipe and the elbow pipe. Adjacent two second valve seats are connected through the connecting flange on the first horizontal pipe and the connecting flange on the elbow pipe of another second valve seat. A balance piston and a first spring are arranged coaxially in the second horizontal pipe. The elastic force of the first spring pushes the balance piston to insert into the first horizontal pipe to block the connection between the first vertical pipe and the first horizontal pipe. An adjusting sleeve is coaxially sleeved outside the second horizontal pipe. A limiting cylinder is arranged at the axis of the adjusting sleeve. The limiting cylinder is inserted into the second horizontal pipe. The adjusting sleeve drives the limiting cylinder to move along the axis direction of the second horizontal pipe to limit the moving range of the balance piston towards the second horizontal pipe. A triggering mechanism is arranged on the adjusting sleeve. An upstream pressure reducing cavity is arranged on the first horizontal pipe. A pressure reducing valve core and a locking slider for locking the pressure reducing valve core are arranged in the upstream pressure reducing cavity. The triggering mechanism releases the locking of the locking slider on the pressure reducing valve core when the balance piston contacts the limiting cylinder.

[0007] Preferably, an inner sleeve is arranged coaxially in the second horizontal pipe. The inner sleeve extends from the end of the second horizontal pipe far away from the first horizontal pipe towards the first horizontal pipe. A first guiding rod is coaxially installed at one end of the balance piston facing the inner sleeve. A limiting head is arranged at the end of the first guiding rod inserted into the inner sleeve. A plurality of side limiting grooves extending along the axis direction of the first guiding rod are arranged on the circumferential side of the limiting head. Limiting strips matching the side limiting grooves are arranged on the inner wall of the inner sleeve. The limiting head is slidably installed in the inner sleeve through the side limiting grooves. A slope for guiding the fluid to move into the first vertical pipe is arranged on one side of the balance piston facing the first horizontal pipe.

[0008] Preferably, the upstream pressure reducing cavity extends radially along the first horizontal pipe. A second guiding rod is coaxially arranged on the pressure reducing valve core in the upstream pressure reducing cavity. The second guiding rod extends towards the side far away from the first horizontal pipe. A second spring is arranged in the upstream pressure reducing cavity. The elastic force of the second spring pushes the pressure reducing valve core to move towards the first horizontal pipe. A positioning convex block protruding from the inner wall of the upstream pressure reducing cavity is arranged at the connection between the upstream pressure reducing cavity and the first horizontal pipe. When the second spring pushes the pressure reducing valve core to fit on the upper side of the positioning convex block, the locking slider fits on the upper side of the pressure reducing valve core to lock the position of the pressure reducing valve core.

[0009] Preferably, a sliding cavity extending along the axis of the second horizontal pipe is arranged on one side of the upstream pressure reducing cavity close to the second horizontal pipe. A sliding block is slidably installed in the sliding cavity. A locking slider is slidably installed on the side of the sliding block facing the upstream pressure reducing cavity. The locking slider and the sliding block are elastically connected by a third spring. The elastic force of the third spring makes the locking slider move towards the upstream pressure reducing cavity and insert into the upstream pressure reducing cavity. An inclined surface is arranged on the upper side of the end of the locking slider facing the upstream pressure reducing cavity. When the pressure reducing valve core moves downward and contacts the inclined surface of the locking slider, the locking slider is pushed to compress the third spring and enter the sliding cavity.

[0010] Preferably, the outer part of the second horizontal pipe is provided with threads, the inner wall of the adjusting sleeve is provided with threads, the adjusting sleeve is spirally installed at the second horizontal pipe, the outer part of the second horizontal pipe is provided with a pressure indicating scale extending along the axis of the second horizontal pipe, scales are arranged on the pressure indicating scale, and the pressure indicating scale is attached to the outer wall of the adjusting sleeve.

[0011] Preferably, the triggering mechanism includes a U-shaped rod. The U-shaped rod has two horizontal first rod bodies and a second rod body. The axis of the first rod body is on the same straight line as the axis of the second horizontal pipe. A plugging sleeve extending horizontally to the outside of the sliding cavity is arranged on the side of the sliding block far from the upstream pressure reducing cavity. The second rod body is fixedly connected with the plugging sleeve. The first rod body is coaxially inserted into the limiting cylinder of the adjusting sleeve. The limiting cylinder has an inner cavity larger than the diameter of the first rod body. A limiting ring is coaxially arranged on the part of the first rod body located in the limiting cylinder. The outer wall of the limiting ring fits the inner wall of the limiting cylinder. A guiding ring is coaxially arranged at the end of the limiting cylinder far from the first horizontal pipe. The inner wall of the guiding ring fits the outer wall of the first rod body. A fourth spring is arranged in the limiting cylinder. The fourth spring elastically connects the guiding ring and the limiting ring. The elastic force of the fourth spring makes the limiting ring fit the top end of the limiting cylinder and makes the top end of the first rod body pass through the opening at the top end of the limiting cylinder and enter the inner sleeve.

[0012] Preferably, the length of the locking slider protruding from the inner wall of the upstream pressure reducing cavity is not less than the length of the first rod body protruding from the top end of the inner sleeve.

[0013] Preferably, the diameter of the second rod body is equal to the inner diameter of the plugging sleeve. A threaded rod extending radially along the second rod body is arranged at the top end of the second rod body. A waist-shaped hole extending along the axis of the plugging sleeve is arranged on the plugging sleeve. The width of the waist-shaped hole is the same as the diameter of the threaded rod. The threaded rod moves in the waist-shaped hole. A locking nut is spirally installed on the threaded rod. When the locking nut fits the outer wall of the plugging sleeve, the second rod body and the plugging sleeve are locked, and the first rod body and the locking slider move synchronously.

[0014] Preferably, the bottom end of the elbow pipe is arranged parallel to the axis of the first vertical pipe.

[0015] Preferably, fitting rings are coaxially arranged at the bottom ends of the elbow pipe and the first longitudinal pipe. The outer diameter of the fitting ring is larger than the outer diameters of the elbow pipe and the first longitudinal pipe and is equal to the inner diameter of the U-shaped connecting pipe. The fitting rings of the elbow pipe and the first longitudinal pipe are respectively inserted at both ends of the U-shaped connecting pipe; fifth springs are respectively sleeved outside the elbow pipe and the first longitudinal pipe. The fifth springs elastically connect the top end of the U-shaped connecting pipe and the upper side of the fitting ring, and the elastic force of the fifth springs moves the U-shaped connecting pipe upward.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] First, the present invention uses one first valve seat and multiple second valve seats in series. By adjusting the adjusting sleeves on each second valve seat, it drives the limiting cylinder to move along the axis direction of the second horizontal pipe to limit the moving range of the balance piston in the direction of the second horizontal pipe, so as to adjust the maximum pressure reduction effect in each second valve seat. At the same time, the pressure value at which the triggering mechanism is triggered is flexibly adjusted, and then the unlocking timing of the pressure reducing valve core is controlled, realizing precise pressure reduction adjustment under different pressure conditions.

[0018] Second, through the threaded connection between the adjusting sleeve and the second horizontal pipe and the setting of the pressure indicating scale in the present invention, the operator can conveniently and accurately adjust the triggering pressure value of the triggering mechanism. This enables the multi-stage pressure reducing gate valve to adapt to different extreme pressure conditions. The U-shaped rod structure of the triggering mechanism and its connection with the locking slider ensure the accuracy and reliability of the triggering action. When the balance piston contacts the first rod body, it can quickly and accurately transmit the force to the locking slider to unlock the pressure reducing valve core.

[0019] Third, through the ingenious design of the fifth spring and the U-shaped connecting pipe in the present invention, automatic adjustment of the pressure in the first longitudinal pipe is realized. When the pressure increases abnormally, without external intervention, the device can automatically respond and reduce the pressure by changing the flow area, improving the stability and reliability of the system and effectively coping with the pressure fluctuations in the first longitudinal pipe under extreme pressure conditions. Description of the Drawings

[0020] Figure 1 is a three-dimensional view of a multi-stage pressure reducing gate valve for extreme pressure conditions;

[0021] Figure 2 is a side view of a multi-stage pressure reducing gate valve for extreme pressure conditions;

[0022] Figure 3 is Figure 2 the sectional view taken along the A-A line of

[0023] Figure 4 is Figure 3 the partial enlarged view at B of

[0024] Figure 5 is Figure 3 the partial enlarged view at position C of

[0025] Figure 6 a three-dimensional sectional view of a multi-stage pressure reducing gate valve for extreme pressure conditions;

[0026] Figure 7 is Figure 6 the partial enlarged view at position D of

[0027] Figure 8 is Figure 6 the partial enlarged view at position E of

[0028] Figure 9 is Figure 6 the partial enlarged view at position F of

[0029] Figure 10 a three-dimensional structural decomposition of a multi-stage pressure reducing gate valve for extreme pressure conditions Figure One ;

[0030] Figure 11 a three-dimensional structural decomposition of a multi-stage pressure reducing gate valve for extreme pressure conditions Figure Two .

[0031] The reference numerals in the figure are: 1, the first valve seat; 11, the gate plate; 2, the second valve seat; 21, the tee pipe; 211, the first horizontal pipe; 212, the second horizontal pipe; 213, the first vertical pipe; 214, the inner sleeve; 215, the pressure indicating scale; 22, the elbow pipe; 221, the fitting ring; 222, the fifth spring; 23, the connecting flange; 24, the balance piston; 241, the first spring; 242, the first guide rod; 243, the limit head; 244, the side limit groove; 25, the adjusting sleeve; 251, the limit cylinder; 252, the guide ring; 253, the fourth spring; 26, the trigger mechanism; 261, the U-shaped rod; 262, the first rod body; 263, the second rod body; 264, the limit ring; 265, the threaded rod; 266, the locking nut; 27, the upstream pressure reducing cavity; 271, the pressure reducing valve core; 272, the second guide rod; 273, the second spring; 274, the positioning convex block; 28, the locking slider; 281, the sliding cavity; 282, the sliding block; 283, the third spring; 284, the inserted sleeve; 285, the kidney-shaped hole; 29, the U-shaped connecting pipe. Detailed implementation manners

[0032] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0033] Refer to Figures 1 to 11 :

[0034] A multi-stage pressure reducing gate valve for extreme pressure conditions, comprising a first valve seat 1 and a plurality of second valve seats 2. A gate plate 11 is arranged in the first valve seat 1. The second valve seat 2 includes a tee pipe 21 and an elbow pipe 22. The tee pipe 21 (combined Figure 1 , Figure 3 and Figure 4 ) consists of a first horizontal pipe 211 and a second horizontal pipe 212 arranged coaxially and a first vertical pipe 213 extending radially along the first horizontal pipe 211. The first vertical pipe 213 is communicated with the elbow pipe 22. Connecting flanges 23 are arranged on the first horizontal pipe 211 and the elbow pipe 22. Adjacent two second valve seats 2 are connected by the connecting flange 23 on the first horizontal pipe 211 and the connecting flange 23 on the elbow pipe 22 of another second valve seat 2; A balance piston 24 and a first spring 241 are coaxially arranged in the second horizontal pipe 212. The elastic force of the first spring 241 pushes the balance piston 24 to insert into the first horizontal pipe 211 to block the connection between the first vertical pipe 213 and the first horizontal pipe 211. An adjusting sleeve 25 is coaxially sleeved outside the second horizontal pipe 212. A limiting cylinder 251 is arranged at the axis of the adjusting sleeve 25. The limiting cylinder 251 is inserted into the second horizontal pipe 212. The adjusting sleeve 25 drives the limiting cylinder 251 to move along the axis direction of the second horizontal pipe 212 to limit the moving range of the balance piston 24 towards the second horizontal pipe 212; A triggering mechanism 26 is arranged on the adjusting sleeve 25. An upstream pressure reducing cavity 27 (as shown in Figure 5 ) is arranged on the first horizontal pipe 211. A pressure reducing valve core 271 and a locking slider 28 for locking the pressure reducing valve core 271 are arranged in the upstream pressure reducing cavity 27. The triggering mechanism 26 releases the locking of the locking slider 28 on the pressure reducing valve core 271 when the balance piston 24 contacts the limiting cylinder 251.

[0035] This application is connected to a pipeline through a fixed first valve seat 1, and then several second valve seats 2 can be installed according to actual usage requirements. Adjacent second valve seats 2 are connected through the connecting flange 23 on the first horizontal pipe 211 to the connecting flange 23 on the elbow pipe 22 of another second valve seat 2, realizing multi-stage regulation of the pressure in the pipeline. Inside the first valve seat 1, the gate plate 11 is in a specific position to control the flow of liquid. Initially, in the second valve seat 2, the balance piston 24 is pushed by the elastic force of the first spring 241 and inserted into the first horizontal pipe 211 to block the connection between the first vertical pipe 213 and the first horizontal pipe 211. When liquid enters the first horizontal pipe 211, the pressure in the pipeline gradually increases. As the pressure increases, the pressure acting on the balance piston 24 overcomes the elastic force of the first spring 241, causing the balance piston 24 to move towards the second horizontal pipe 212 and release the connection channel between the first horizontal pipe 211 and the first vertical pipe 213. The balance piston 24 reduces the pressure on the first vertical pipe 213, thereby reducing the pressure at the input end of the next second valve seat 2. As the pressure in the pipeline increases, the liquid pushes the balance piston 24 to compress the first spring 241, causing the balance piston 24 to move towards the second horizontal pipe 212, increasing the flow of liquid into the first vertical pipe 213, and thus reducing the pressure in the first horizontal pipe 211. At this time, the pressure reducing valve core 271 in the upstream pressure reducing cavity 27 is locked by the locking slider 28. When the balance piston 24 moves to contact the limit cylinder 251, the pressure reducing effect of the second valve seat 2 reaches the maximum, and the trigger mechanism 26 on the adjusting sleeve 25 is triggered. The trigger mechanism 26 immediately releases the locking of the locking slider 28 on the pressure reducing valve core 271. After the pressure reducing valve core 271 is unlocked, under the action of the pipeline pressure, the liquid pushes the pressure reducing valve core 271 to move, enabling the liquid in the first horizontal pipe 211 to be reduced in pressure through the upstream pressure reducing cavity 27. The liquid passing through the second valve seat 2 enters the elbow pipe 22 through the first vertical pipe 213, and then enters the next-level second valve seat 2 through the connecting flange 23 to continue the above pressure reducing process. Multiple second valve seats 2 are connected in series. By adjusting the adjusting sleeve 25 on each second valve seat 2, it drives the limit cylinder 251 to move along the axis of the second horizontal pipe 212 to limit the moving range of the balance piston 24 towards the second horizontal pipe 212, thereby adjusting the maximum pressure reducing effect in each second valve seat 2. At the same time, the pressure value at which the trigger mechanism 26 is triggered is flexibly adjusted, and then the unlocking timing of the pressure reducing valve core 271 is controlled to achieve precise pressure reducing regulation under different pressure conditions. In this embodiment, each second valve seat 2 has the same structure, greatly reducing the accuracy requirements for installation and assembly, reducing the installation difficulty caused by large differences in components during the installation process, and also facilitating the operation of installers and reducing the excessive requirements for the technical level of installers. The series connection of multiple second valve seats 2 forms a multi-stage pressure reducing structure. Each stage can effectively regulate the liquid pressure and gradually reduce the pressure, enabling more stable and efficient pressure reduction under extreme pressure conditions.

[0036] In order to achieve the purpose of guiding the water entering the first horizontal pipe 211 into the first vertical pipe 213, the following features are specifically set:

[0037] An inner sleeve 214 is coaxially arranged in the second horizontal pipe 212. The inner sleeve 214 extends from the end of the second horizontal pipe 212 far from the first horizontal pipe 211 towards the first horizontal pipe 211. One end of the balance piston 24 facing the inner sleeve 214 is coaxially installed with a first guide rod 242. A limit head 243 is arranged at the end of the first guide rod 242 inserted into the inner sleeve 214. A plurality of side limit grooves 244 extending along the axis direction of the first guide rod 242 are arranged on the peripheral side of the limit head 243 (in combination Figure 4 and Figure 11 ), and limit strips matching the side limit grooves 244 are arranged on the inner wall of the inner sleeve 214. The limit head 243 is slidably installed in the inner sleeve 214 through the side limit grooves 244; on the side of the balance piston 24 facing the first horizontal pipe 211, there is an inclined surface for guiding the fluid to move into the first vertical pipe 213.

[0038] In this embodiment, when the liquid enters the first horizontal pipe 211, the pressure in the pipeline increases, and the pressure acts on the balance piston 24. Since there is an inclined surface on the side of the balance piston 24 facing the first horizontal pipe 211, a component force is generated by the liquid pressure on the inclined surface, and this component force promotes the liquid to have a flowing tendency towards the first vertical pipe 213. At the same time, the pressure overcomes the elastic force of the first spring 241, causing the balance piston 24 to move towards the second horizontal pipe 212. As the balance piston 24 moves towards the second horizontal pipe 212, the blockage at the connection between the first horizontal pipe 211 and the first vertical pipe 213 is gradually released. Under the action of its own pressure and the guiding action of the inclined surface of the balance piston 24, the liquid smoothly flows into the first vertical pipe 213, thereby achieving the purpose of guiding the water entering the first horizontal pipe 211 into the first vertical pipe 213. During the movement of the balance piston 24, the first guide rod 242 coaxially installed on the balance piston 24 moves while being inserted into the inner sleeve 214. The limit head 243 arranged at one end thereof cooperates with the limit strips on the inner wall of the inner sleeve 214 through the side limit grooves 244 on the peripheral side and slides in the inner sleeve 214. This structure ensures the stability of the balance piston 24 during the movement, enabling it to move only along the axis direction of the first guide rod 242, and ensuring that the inclination direction of the inclined surface on the balance piston 24 remains unchanged all the time, so as to stably guide the flow direction of the liquid. The design of the inclined surface on the side of the balance piston 24 facing the first horizontal pipe 211 cleverly utilizes the component force of the liquid pressure to actively guide the liquid to flow towards the first vertical pipe 213, improving the efficiency of the liquid flowing from the first horizontal pipe 211 into the first vertical pipe 213 and reducing the flow resistance of the liquid in the valve seat.

[0039] In order to solve the problem of how the upstream pressure reducing chamber 27 reduces the pressure in the first horizontal pipe 211, the following features are specifically set:

[0040] The upstream pressure reducing chamber 27 extends radially along the first horizontal pipe 211. A second guide rod 272 is coaxially arranged on the pressure reducing valve core 271 in the upstream pressure reducing chamber 27. The second guide rod 272 extends towards the side away from the first horizontal pipe 211. A second spring 273 is arranged in the upstream pressure reducing chamber 27. The elastic force of the second spring 273 pushes the pressure reducing valve core 271 to move towards the first horizontal pipe 211. At the connection between the upstream pressure reducing chamber 27 and the first horizontal pipe 211, a positioning convex block 274 protruding from the inner wall of the upstream pressure reducing chamber 27 is provided. When the second spring 273 pushes the pressure reducing valve core 271 to fit on the upper side of the positioning convex block 274, the locking slider 28 fits on the upper side of the pressure reducing valve core 271 to lock the position of the pressure reducing valve core 271.

[0041] In the initial state, the second spring 273 in the upstream pressure reducing chamber 27 pushes the pressure reducing valve core 271 to move towards the first horizontal pipe 211 with its elastic force until the pressure reducing valve core 271 fits on the upper side of the positioning convex block 274. At this time, the locking slider 28 fits on the upper side of the pressure reducing valve core 271 to lock the position of the pressure reducing valve core 271, so that the pressure reducing valve core 271 remains at the position blocking the connection between the upstream pressure reducing chamber 27 and the first horizontal pipe 211, preventing the liquid in the first horizontal pipe 211 from entering the upstream pressure reducing chamber 27. When the balance piston 24 moves to contact the limit cylinder 251, the trigger mechanism 26 acts to release the locking of the locking slider 28 on the pressure reducing valve core 271. At this time, the liquid pressure overcomes the elastic force of the second spring 273 and pushes the pressure reducing valve core 271 to drive the second guide rod 272 to move towards the side away from the first horizontal pipe 211. As the pressure reducing valve core 271 moves, a channel is formed between the first horizontal pipe 211 and the upstream pressure reducing chamber 27, and the liquid flows into the upstream pressure reducing chamber 27. In this process, due to the change in the channel area and the flow resistance of the liquid in the chamber, the liquid pressure is reduced.

[0042] In order to achieve the purpose of locking the locking slider 28 on the pressure reducing valve core 271 and relocking it during the reset process of the pressure reducing valve core 271, the following features are specifically set:

[0043] A sliding chamber 281 extending along the axis of the second horizontal pipe 212 is provided on the side of the upstream pressure reducing chamber 27 close to the second horizontal pipe 212. A sliding block 282 is slidably installed in the sliding chamber 281. The locking slider 28 is slidably installed on the side of the sliding block 282 facing the upstream pressure reducing chamber 27. The locking slider 28 and the sliding block 282 are elastically connected by a third spring 283. The elastic force of the third spring 283 makes the locking slider 28 move towards the upstream pressure reducing chamber 27 and insert into the upstream pressure reducing chamber 27. A slope is provided on the upper side of the end of the locking slider 28 facing the upstream pressure reducing chamber 27. When the pressure reducing valve core 271 moves downward to contact the slope of the locking slider 28, it pushes the locking slider 28 to compress the third spring 283 and enter the sliding chamber 281.

[0044] In the initial state of this embodiment, the elastic force of the third spring 283 pushes the locking slider 28 into the upstream pressure reducing chamber 27, fitting against the upper side of the pressure reducing valve core 271 to maintain the locking of the pressure reducing valve core 271 and prevent its movement, ensuring that the passage between the upstream pressure reducing chamber 27 and the first horizontal pipe 211 is in a blocked state. When the balance piston 24 moves to contact the limit cylinder 251, the trigger mechanism 26 causes the sliding block 282 to move away from the upstream pressure reducing chamber 27 in the sliding chamber 281 and drives the locking slider 28 into the sliding chamber 281. The pressure reducing valve core 271 disengages from the locking slider 28, and the liquid enters the upstream pressure reducing chamber 27 to start the pressure reducing process. As the pressure reducing process progresses, when the pressure difference between the upstream pressure reducing chamber 27 and the first horizontal pipe 211 decreases, the second spring 273 pushes the pressure reducing valve core 271 to reset downward. There is a situation where the locking slider 28 may re-enter the upstream pressure reducing chamber 27 due to the decrease in pressure in the first horizontal pipe 211. When the pressure reducing valve core 271 moves downward and contacts the inclined surface on the upper side of the end of the locking slider 28 facing the upstream pressure reducing chamber 27, due to the guiding effect of the inclined surface, the pressure reducing valve core 271 generates a horizontal component force on the locking slider 28, which compresses the third spring 283 and causes the locking slider 28 to move into the sliding chamber 281. When the pressure reducing valve core 271 continues to move downward until it fits against the positioning convex block 274, the locking slider 28 is pushed by the elastic force of the third spring 283 to re-enter the upstream pressure reducing chamber 27, fitting against the upper side of the pressure reducing valve core 271, and locking the pressure reducing valve core 271 again to restore to the initial locking state. Through the cooperation of the third spring 283 and the inclined surface on the locking slider 28, this embodiment realizes the reliable locking and unlocking functions of the locking slider 28 on the pressure reducing valve core 271. During the reset process of the pressure reducing valve core 271, the re-locking can be directly achieved through the action of the inclined surface and the third spring 283, ensuring the orderly progress of the pressure reducing process and improving the reliability of the device operation.

[0045] In order to enable the trigger mechanism 26 to cooperate with the adjusting sleeve 25 to change the trigger pressure value and directly release the locking of the locking slider 28 on the pressure reducing valve core 271 after triggering, the following features are specifically set:

[0046] The second horizontal pipe 212 is externally provided with threads, the inner wall of the adjusting sleeve 25 is provided with threads, the adjusting sleeve 25 is spirally installed at the second horizontal pipe 212, the second horizontal pipe 212 is externally provided with a pressure indicating scale 215 extending along the axis direction of the second horizontal pipe 212, the pressure indicating scale 215 is provided with graduations, and the pressure indicating scale 215 fits against the outer wall of the adjusting sleeve 25.

[0047] The triggering mechanism 26 includes a U-shaped rod 261. The U-shaped rod 261 has two horizontal first rod bodies 262 and a second rod body 263. The axis of the first rod body 262 is collinear with the axis of the second horizontal pipe 212. On the side of the sliding block 282 away from the upstream pressure reduction chamber 27, there is an insertion sleeve 284 horizontally extending outside the sliding chamber 281. The second rod body 263 is fixedly connected to the insertion sleeve 284. The first rod body 262 is coaxially inserted into the limiting cylinder 251 of the adjusting sleeve 25. The limiting cylinder 251 has an inner cavity larger than the diameter of the first rod body 262. A limiting ring 264 is coaxially arranged at the part of the first rod body 262 located in the limiting cylinder 251. The outer wall of the limiting ring 264 is in contact with the inner wall of the limiting cylinder 251. A guiding ring 252 is coaxially arranged at one end of the limiting cylinder 251 away from the first horizontal pipe 211. The inner wall of the guiding ring 252 is in contact with the outer wall of the first rod body 262. A fourth spring 253 is arranged in the limiting cylinder 251. The fourth spring 253 elastically connects the guiding ring 252 and the limiting ring 264. The elastic force of the fourth spring 253 makes the limiting ring 264 fit against the top end of the limiting cylinder 251 and makes the top end of the first rod body 262 pass through the opening at the top end of the limiting cylinder 251 and enter the inner sleeve 214.

[0048] The length by which the locking slider 28 protrudes from the inner wall of the upstream pressure reduction chamber 27 is not less than the length by which the first rod body 262 protrudes from the top end of the limiting cylinder 251.

[0049] In this embodiment, since the adjusting sleeve 25 is helically installed on the second horizontal pipe 212 through threads, and a pressure indicating scale 215 is provided outside the second horizontal pipe 212. When it is necessary to change the trigger pressure value of the trigger mechanism 26, the adjusting sleeve 25 can be rotated. As the adjusting sleeve 25 moves along the axis direction of the second horizontal pipe 212, the limiting cylinder 251 connected to the adjusting sleeve 25 also moves accordingly. Since the first rod body 262 is inserted into the limiting cylinder 251 and is connected to the guiding ring 252 through the limiting ring 264 and the fourth spring 253, the movement of the limiting cylinder 251 will change the position of the top end of the first rod body 262 in the inner sleeve 214. And the position of the first rod body 262 determines the position at which the balance piston 24 moves to trigger the trigger mechanism 26, thereby realizing the function of adjusting the trigger pressure value according to actual needs. By observing the scale on the pressure indicating scale 215, the position of the adjusting sleeve 25 can be intuitively understood, and thus the currently set trigger pressure value can be determined. When the pressure in the pipeline increases, the balance piston 24 moves, and the first guiding rod 242 and the limiting head 243 of the balance piston 24 move in the inner sleeve 214. When the limiting head 243 contacts the top end of the first rod body 262, the continuously moving balance piston 24 will push the first rod body 262 to move away from the first horizontal pipe 211 through the limiting head 243. Since the first rod body 262 is connected to the second rod body 263 through the U-shaped rod 261, and the second rod body 263 is fixedly connected to the insertion sleeve 284 on the sliding block 282, the movement of the first rod body 262 will drive the sliding block 282 and the locking slider 28 connected thereto to move, so that the locking slider 28 moves and releases the locking of the pressure reducing valve core 271. In this embodiment, through the threaded connection between the adjusting sleeve 25 and the second horizontal pipe 212 and the setting of the pressure indicating scale 215, the operator can conveniently and accurately adjust the trigger pressure value of the trigger mechanism 26. This enables the multi-stage pressure reducing gate valve to adapt to different extreme pressure conditions. When the balance piston 24 contacts the first rod body 262, it can quickly and accurately transmit the force to the locking slider 28 to unlock the pressure reducing valve core 271, avoiding abnormal pressure reduction caused by untimely or inaccurate triggering and ensuring the stability and efficiency of the pressure reduction process. The length of the locking slider 28 protruding from the inner wall of the upstream pressure reducing chamber 27 is not less than the length of the first rod body 262 protruding from the top end of the inner sleeve 214. This design ensures that when the limiting head 243 pushes the first rod body 262 completely into the limiting cylinder 251, the locking slider 28 also completely enters the sliding chamber 281 to release the locking of the pressure reducing valve core 271.

[0050] When the adjusting sleeve 25 moves, the U-shaped rod 261 will also move with it, thus changing the distance from the locking slider 28. In order to maintain the connection relationship between the second rod body 263 of the U-shaped rod 261 and the insertion sleeve 284 of the sliding block 282 following the movement of the adjusting sleeve 25, and to maintain the effect that when the limit head 243 pushes the first rod body 262 completely into the limit cylinder 251, the locking slider 28 also completely enters the sliding cavity 281, the following features are specifically set:

[0051] The diameter of the second rod body 263 is equal to the inner diameter of the insertion sleeve 284. A threaded rod 265 extending radially along the second rod body 263 is provided at the top of the second rod body 263. A waist-shaped hole 285 extending along the axis direction of the insertion sleeve 284 is provided on the insertion sleeve 284 (as Figure 8 shown). The width of the waist-shaped hole 285 is the same as the diameter of the threaded rod 265. The threaded rod 265 moves within the waist-shaped hole 285. A locking nut 266 is spirally installed on the threaded rod 265. When the locking nut 266 fits against the outer wall of the insertion sleeve 284, the second rod body 263 and the insertion sleeve 284 are locked, and the first rod body 262 and the locking slider 28 move synchronously.

[0052] In this embodiment, during the installation stage, the second rod body 263 is inserted into the insertion sleeve 284. At this time, the threaded rod 265 is aligned with the waist-shaped hole 285 and inserted. By rotating the adjusting sleeve 25, the relative position between the U-shaped rod 261 and the locking slider 28 is adjusted to meet different pressure trigger requirements. During the adjustment process, the threaded rod 265 moves within the waist-shaped hole 285. When the appropriate position is reached, the locking nut 266 is tightened on the threaded rod 265 to make it fit against the outer wall of the insertion sleeve 284, thereby locking the second rod body 263 and the insertion sleeve 284 and ensuring that the first rod body 262 and the locking slider 28 can move synchronously. Through the design of the waist-shaped hole 285 and the threaded rod 265 in this embodiment, the connection between the second rod body 263 and the insertion sleeve 284 can adapt to the position change caused by the movement of the adjusting sleeve 25. The operator can flexibly adjust the relative position between the U-shaped rod 261 and the locking slider 28 within a certain range according to actual needs to ensure that when the limit head 243 pushes the first rod body 262 completely into the limit cylinder 251, the locking slider 28 also completely enters the sliding cavity 281 with precise effect under different trigger pressure settings, improving the adaptability of the device to different working conditions.

[0053] In order to achieve the purpose of decompressing the first longitudinal pipe 213 when the pressure in the first longitudinal pipe 213 is relatively high, the following features are specifically set:

[0054] The bottom end of the elbow pipe 22 is arranged parallel to the axis of the first longitudinal pipe 213.

[0055] At the bottom ends of the elbow pipe 22 and the first longitudinal pipe 213, there are fitting rings 221 coaxially arranged. The outer diameter of the fitting ring 221 is larger than the outer diameters of the elbow pipe 22 and the first longitudinal pipe 213 and is equal to the inner diameter of the U-shaped connecting pipe 29. The fitting rings 221 of the elbow pipe 22 and the first longitudinal pipe 213 are respectively inserted at both ends of the U-shaped connecting pipe 29; fifth springs 222 are respectively sleeved outside the elbow pipe 22 and the first longitudinal pipe 213. The fifth springs 222 elastically connect the top end of the U-shaped connecting pipe 29 and the upper side of the fitting ring 221, and the elastic force of the fifth springs 222 makes the U-shaped connecting pipe 29 move upward.

[0056] In this embodiment, the liquid entering the first longitudinal pipe 213 enters the second valve seat 2 at the next level through the U-shaped connecting pipe 29 and the elbow pipe 22. When the pressure in the first longitudinal pipe 213 gradually increases, the pressure acts on the U-shaped connecting pipe 29. As the pressure continues to rise, the pressure acting on the U-shaped connecting pipe 29 gradually overcomes the elastic force of the fifth spring 222, and the U-shaped connecting pipe 29 begins to move downward. During the downward movement of the U-shaped connecting pipe 29, the flow area between it and the first longitudinal pipe 213 gradually increases, the volume inside the U-shaped connecting pipe 29 also increases, the fluid flow rate decreases, and the pressure also decreases accordingly, thus realizing the pressure reduction of the pressure in the first longitudinal pipe 213. Through the ingenious design of the fifth spring 222 and the U-shaped connecting pipe 29, the automatic adjustment of the pressure in the first longitudinal pipe 213 is realized. When the pressure increases abnormally, without external intervention, the device can automatically respond, reduce the pressure by changing the flow area, improve the stability and reliability of the system, and effectively cope with the pressure fluctuation in the first longitudinal pipe 213 under extreme pressure conditions.

[0057] Working principle: The staff connects a fixed first valve seat 1 to the pipeline, and then several second valve seats 2 can be installed according to actual usage requirements. The trigger pressure values of the trigger mechanisms 26 of each second valve seat 2 are adjusted through the adjusting sleeves 25 on each second valve seat 2 to realize the multi-stage adjustment of the pressure in the pipeline. When the liquid enters the first horizontal pipe 211, as the pressure in the pipeline increases, the liquid pushes the balance piston 24 to compress the first spring 241, causing the balance piston 24 to move towards the second horizontal pipe 212 direction, increasing the flow rate of the liquid into the first longitudinal pipe 213, thereby reducing the pressure in the first horizontal pipe 211. At this time, the pressure reducing valve core 271 in the upstream pressure reducing chamber 27 is locked by the locking slider 28. When the balance piston 24 moves to contact the limit cylinder 251, the pressure reducing effect of the second valve seat 2 reaches the maximum, and when the trigger mechanism 26 on the adjusting sleeve 25 is triggered, the locking of the pressure reducing valve core 271 by the locking slider 28 is immediately released. Under the action of the pressure in the pipeline, the liquid pushes the pressure reducing valve core 271 to move, so that the liquid in the first horizontal pipe 211 is decompressed through the upstream pressure reducing chamber 27. The liquid after passing through the second valve seat 2 enters the elbow pipe 22 through the first longitudinal pipe 213, and then enters the next-level second valve seat 2 through the connecting flange 23 to continue repeating the above pressure reducing process.

[0058] The above embodiments merely represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended claims.

Claims

1. A multi-stage pressure reducing gate valve for use under extreme pressure conditions, characterized in that: It includes a first valve seat and a plurality of second valve seats, wherein a gate is arranged in the first valve seat, and the second valve seat includes a tee pipe and an elbow pipe, wherein the tee pipe is composed of a first transverse pipe and a second transverse pipe arranged coaxially and a first longitudinal pipe extending radially along the first transverse pipe, wherein the first longitudinal pipe is connected with the elbow pipe, and connecting flanges are arranged on the first transverse pipe and the elbow pipe, and two adjacent second valve seats are connected with the connecting flange on the elbow pipe of another second valve seat through the connecting flange on the first transverse pipe; A balancing piston and a first spring are coaxially arranged in the second transverse tube. The elastic force of the first spring pushes the balancing piston to be inserted into the first transverse tube to block the connection between the first longitudinal tube and the first transverse tube. An adjusting sleeve is coaxially sleeved on the outside of the second transverse tube. A limiting cylinder is arranged at the axis of the adjusting sleeve. The limiting cylinder is inserted into the second transverse tube. The adjusting sleeve drives the limiting cylinder to move along the axis direction of the second transverse tube to limit the moving range of the balancing piston in the direction of the second transverse tube. A trigger mechanism is provided on the adjusting sleeve, an upstream decompression chamber is provided on the first transverse tube, a decompression valve core and a locking slider for locking the decompression valve core are provided in the upstream decompression chamber, and the trigger mechanism releases the locking slider from locking the decompression valve core when the balancing piston contacts the limiting cylinder.

2. A multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 1, characterized in that: An inner sleeve is coaxially arranged in the second transverse tube, and the inner sleeve extends from one end of the second transverse tube away from the first transverse tube toward the first transverse tube. A first guide rod is coaxially installed on one end of the balance piston facing the inner sleeve. A limit head is arranged at one end of the first guide rod inserted in the inner sleeve, and a plurality of side limit grooves extending along the axis direction of the first guide rod are arranged around the limit head. A limit strip matching the side limit groove is arranged on the inner wall of the inner sleeve, and the limit head is slidably installed in the inner sleeve through the side limit groove. A slope for guiding the fluid to move into the first longitudinal tube is arranged on one side of the balance piston facing the first transverse tube.

3. A multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 1, characterized in that: The upstream decompression chamber extends radially along the first transverse tube, a second guide rod is coaxially arranged on the decompression valve core in the upstream decompression chamber, the second guide rod extends to a side away from the first transverse tube, a second spring is arranged in the upstream decompression chamber, and the elastic force of the second spring pushes the decompression valve core to move toward the first transverse tube; A positioning protrusion protruding from the inner wall of the upstream decompression chamber is provided at the connection between the upstream decompression chamber and the first transverse tube. When the second spring pushes the decompression valve core to fit on the upper side of the positioning protrusion, the locking slider fits on the upper side of the decompression valve core to lock the position of the decompression valve core.

4. A multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 3, characterized in that: A sliding cavity extending along the axis direction of the second transverse tube is provided on one side of the upstream decompression cavity close to the second transverse tube, a sliding block is slidably installed in the sliding cavity, a locking slider is slidably installed on the side of the sliding block facing the upstream decompression cavity, the locking slider and the sliding block are elastically connected by a third spring, and the elastic force of the third spring causes the locking slider to move toward one side of the upstream decompression cavity and be inserted into the upstream decompression cavity; An inclined surface is arranged on the upper side of one end of the locking slide block facing the upstream pressure reducing chamber. When the pressure reducing valve core moves from top to bottom and contacts the inclined surface of the locking slide block, the locking slide block is pushed to compress the third spring and enter the sliding chamber.

5. A multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 4, characterized in that: The second transverse tube is provided with threads on the outside, and threads are provided on the inner wall of the adjusting sleeve. The adjusting sleeve is spirally installed on the second transverse tube. A pressure indicating scale extending along the axis direction of the second transverse tube is provided on the outside of the second transverse tube. The pressure indicating scale is provided with scales, and the pressure indicating scale is in contact with the outer wall of the adjusting sleeve.

6. A multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 4, characterized in that: The trigger mechanism comprises a U-shaped rod, the U-shaped rod has two horizontal first rod bodies and a second rod body, the axis of the first rod body and the axis of the second cross tube are in the same straight line, the side of the sliding block away from the upstream decompression chamber is provided with a plug-in sleeve extending horizontally to the outside of the sliding chamber, and the second rod body is fixedly connected to the plug-in sleeve; The first rod body is coaxially inserted in the limiting cylinder of the adjusting sleeve, and the limiting cylinder has an inner cavity larger than the diameter of the first rod body. A limiting ring is coaxially arranged at the position of the first rod body located in the limiting cylinder, and the outer wall of the limiting ring fits the inner wall of the limiting cylinder. A guide ring is coaxially arranged at the end of the limiting cylinder away from the first transverse tube, and the inner wall of the guide ring fits the outer wall of the first rod body. A fourth spring is arranged in the limiting cylinder, and the fourth spring elastically connects the guide ring and the limiting ring. The elastic force of the fourth spring makes the limiting ring fit the top end of the limiting cylinder, and makes the top end of the first rod body pass through the opening at the top end of the limiting cylinder and enter the inner sleeve.

7. A multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 6, characterized in that: The length of the locking slider protruding from the inner wall of the upstream decompression chamber is not less than the length of the first rod body protruding from the top end of the inner sleeve.

8. The multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 6, characterized in that: The diameter of the second rod body is equal to the inner diameter of the insert sleeve, and a threaded rod extending radially along the second rod body is provided at the top of the second rod body. A waist-shaped hole extending along the axial direction of the insert sleeve is provided on the insert sleeve, and the width of the waist-shaped hole is the same as the diameter of the threaded rod. The threaded rod is located in the waist-shaped hole and moves. A locking nut is spirally installed on the threaded rod. When the locking nut is in contact with the outer wall of the insert sleeve, the second rod body and the insert sleeve are locked, and the first rod body and the locking slider move synchronously.

9. The multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 1, characterized in that: The bottom end of the elbow pipe is arranged parallel to the axis of the first longitudinal pipe.

10. A multi-stage pressure reducing gate valve for use under extreme pressure conditions according to claim 9, characterized in that: The bottom ends of the elbow tube and the first longitudinal tube are coaxially provided with a fitting ring, the outer diameter of the fitting ring is larger than the outer diameters of the elbow tube and the first longitudinal tube and is equal to the inner diameter of the U-shaped connecting tube, and the fitting rings of the elbow tube and the first longitudinal tube are respectively inserted at both ends of the U-shaped connecting tube; The elbow tube and the first longitudinal tube are respectively sleeved with a fifth spring, which elastically connects the top of the U-shaped connecting tube with the upper side of the fitting ring, and the elastic force of the fifth spring causes the U-shaped connecting tube to move upward.

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