Opening control device for gate valve

Abstract

The invention relates to the technical field of gate valve control, in particular to an opening control device for a gate valve, which is characterized in that a valve cover is fixedly mounted above a valve seat, a hand wheel is rotatably mounted above the valve cover, a step sleeve and a telescopic frame are fixedly arranged in the valve seat, and a pressed plate is arranged in the step sleeve; the valve rod is arranged in the valve cover and is in threaded connection with the hand wheel, and the bottom end of the valve rod is fixedly connected with an inner positioning block; the flashboard is arranged in the valve seat, an outer positioning block is arranged at the top of the flashboard, and a lock hole is formed in the surface of the outer positioning block; when the flow of fluid in a pipeline needs to be increased, only the opening degree of the uppermost group of gate valves needs to be increased, the pressure bearing plate in the downstream gate valve is influenced by the pressure of the fluid in the pipeline to drive the end, away from the pressure bearing rod, of the ejector rod to turn upwards, and the ejector rod head jacks the gate plate upwards through the ejector block; therefore, the purpose that the flow of the fluid in the whole pipeline can be changed only by adjusting the opening degree of the uppermost group of gate valves is achieved, and operation is easy and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of gate valve control, in particular to an opening control device for a gate valve. Background Art

[0002] A gate valve is a common type of valve, generally made of basic components such as a valve body, a valve cover, a gate, a valve stem, a valve seat, and a sealing packing. Its opening and closing part is a gate, and the movement direction of the gate is generally perpendicular to the direction of the fluid. The gate is driven up or down by the valve stem to open or close the valve body. It is widely used in pipeline systems in industries such as tap water, ships, petroleum, and chemicals. In the prior art, the opening and closing of the gate valve is mostly controlled manually. The hand wheel is manually controlled to rotate, and the hand wheel drives the valve stem to rise or fall through the thread, so that the valve stem drives the gate to rise and fall to open and close the gate valve. In the process of use, in order to ensure the stability of the pipeline system, a multi-stage valve is often used. When a valve is damaged, the opening and closing of the pipeline can be controlled by another valve. In a pipeline using a multi-stage valve, when adjusting the flow rate of the fluid in the pipeline, it is necessary to adjust the opening of each valve in turn, which is relatively complicated to operate, and the gate valve in the prior art is not convenient for changing the opening in real time according to the pressure of the fluid in the pipeline. Summary of the invention

[0003] The object of the present invention is to provide an opening control device for a gate valve to solve the problems raised by the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: An opening control device for a gate valve, comprising: A valve seat, a valve cover is fixedly installed above the valve seat, a hand wheel is rotatably installed above the valve cover, a stepped sleeve and a telescopic frame are fixedly installed inside the valve seat, a pressure plate is arranged inside the stepped sleeve, and a plurality of groups of pressure rods are installed on the surface of the pressure plate, and a push rod is rotatably connected to the end of one group of pressure rods; The valve stem is arranged inside the valve cover, the valve stem is threadedly connected to the hand wheel, the bottom end of the valve stem is fixedly connected with an inner positioning block, a locking rod is arranged inside the inner positioning block, a free rod is fixedly connected to the bottom of the inner positioning block, a telescopic rod is arranged inside the valve stem, and a convex block is fixedly installed on the surface of the telescopic rod; The gate is arranged inside the valve seat, an external positioning block is arranged on the top of the gate, a locking hole is opened on the surface of the external positioning block, a free hole is opened on the surface of the gate, and a top block is fixedly installed on the surface of the gate.

[0005] Preferably, the stepped sleeve is arranged at the inlet end of the valve seat, and the inner diameter of the stepped sleeve is arranged in multiple groups, and the inner diameter of the stepped sleeve gradually increases from one end close to the inlet of the valve seat to the direction close to the outlet end of the valve seat.

[0006] Preferably, the telescopic frames are provided in multiple groups, and the multiple groups of telescopic frames are distributed in a circular array on the side wall of the valve seat, and the telescopic frames are arranged on one side of the stepped sleeve close to the outlet end of the valve seat.

[0007] Preferably, the diameter of the pressure plate is larger than the minimum inner diameter of the step sleeve, the pressure plate is sealed and fitted with the inner wall of the step sleeve, the pressure rod is arranged on the side of the outlet end of the pressure plate facing the valve seat, and multiple groups of pressure rods are respectively slidably inserted into the interior of multiple groups of telescopic frames, one group of pressure rods is located directly below the interior of the valve seat, and the pressure rod located directly below the interior of the valve seat is provided with a rotation groove at the end away from the pressure plate, and the rotation groove is arranged in a slope shape at the end away from the pressure plate, and a third compression spring is arranged between the pressure plate and the telescopic frame, and the third compression spring is sleeved on the surface of the pressure rod.

[0008] Preferably, the push rod is rotatably connected to the pressure rod located directly below the valve seat through a rotating groove, the end of the push rod away from the pressure rod is fixedly connected to the push rod head, the surface of the push rod close to the pressure rod is fixedly connected to the elastic plate, and the end of the elastic plate away from the push rod is embedded in the surface of the pressure rod.

[0009] Preferably, a telescopic hole is opened inside the valve stem, a first positioning groove and a second positioning groove are opened on the side of the top of the valve stem, the bottom ends of the first positioning groove and the second positioning groove are connected, and the first positioning groove and the second positioning groove are connected to the telescopic hole.

[0010] Preferably, a telescopic groove is provided inside the inner positioning block, and two groups of telescopic blocks are slidably arranged inside the telescopic groove. The opposite sides of the two groups of telescopic blocks are fixedly connected to the locking rod, and the surface of the locking rod is sleeved with a first compression spring. The first compression spring is located between the telescopic block and the side wall of the telescopic groove, and the end of the locking rod away from the telescopic block passes through the surface of the inner positioning block.

[0011] Preferably, a guide hole is opened inside the free rod, and the guide hole is communicated with the telescopic slot.

[0012] Preferably, the telescopic rod is slidably inserted into the telescopic hole, a positioning rod is fixedly connected to the surface of the telescopic rod, and an operating cap is fixedly connected to the positioning rod after extending to the outside of the valve stem, and the operating cap is slidably sleeved on the top of the valve stem. Two groups of protrusions are provided, and the two groups of protrusions are symmetrically arranged on the sides of the telescopic rod. The protrusions are arranged inside the telescopic groove, and one end of the protrusion away from the telescopic rod is fixedly connected to a guide rod, which is slidably inserted into the guide hole, and a second compression spring is provided at one end of the protrusion away from the telescopic rod.

[0013] Preferably, the outer positioning blocks are provided with two groups, the two groups of outer positioning blocks are symmetrically arranged on both sides of the inner positioning block, the locking holes are provided on the opposite sides of the two groups of outer positioning blocks, the locking holes and the locking rods are provided correspondingly, the free holes are located between the two groups of outer positioning blocks, and the free holes penetrate the gate plate, the top block is located on the side of the gate plate close to the top rod, and a connecting groove is provided at the bottom of the top block, and the top block abuts against the top rod head through the connecting groove Compared with the prior art, the present invention has the following beneficial effects: 1. When the flow rate of the fluid in the pipeline needs to be increased, it is only necessary to increase the opening of the most upstream group of gate valves to increase the pressure of the fluid in the pipeline. The pressure plate in the downstream gate valve is affected by the fluid pressure in the pipeline to drive the end of the push rod away from the pressure rod to flip upward, so that the head of the push rod lifts the gate plate upward through the top block, thereby achieving the purpose of changing the flow rate of the fluid in the entire pipeline by only adjusting the opening of the most upstream group of gate valves. The operation is simple and convenient.

[0014] 2. By controlling the rising height of the inner positioning block, the maximum opening of the gate can be controlled. When the pressure of the fluid in the pipeline increases, the gate can adjust the opening automatically within the set opening range, thereby changing the opening in real time according to the pressure of the fluid in the pipeline.

[0015] 3. Turn the handwheel to drive the inner positioning block to be completely inserted between the two sets of outer positioning blocks, and then press and rotate the operating cap to drive the positioning rod to move from the inside of the second positioning groove to the inside of the first positioning groove. The positioning rod drives the telescopic rod to rotate, so that the protrusion squeezes the telescopic blocks on both sides, and drives the locking rod to be inserted into the lock hole to achieve locking between the inner positioning block and the outer positioning block. At this time, turn the handwheel to manually control the opening of the gate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the present invention; Figure 3 For the present invention Figure 2 The enlarged schematic diagram at A in the middle; Figure 4 For the present invention Figure 2 The enlarged schematic diagram of point B in the middle; Figure 5 It is a schematic diagram of the gate structure of the present invention; Figure 6 It is a schematic diagram of the pressure plate structure of the present invention; Figure 7 It is a schematic diagram of the top rod structure of the present invention; Figure 8 It is a schematic diagram of the telescopic rod structure of the present invention; Fig. 9 For the present invention Figure 8The enlarged schematic diagram at C in the middle; Fig.10 It is a schematic diagram of the valve stem structure of the present invention; Fig.11 For the present invention Fig.10 Enlarged schematic diagram at point D in the middle.

[0017] In the figure: Valve seat 1, valve cover 11, hand wheel 12, stepped sleeve 13, telescopic frame 14; Valve stem 2, telescopic hole 21, first positioning groove 22, second positioning groove 23, inner positioning block 24, telescopic groove 241, locking rod 25, telescopic block 251, first compression spring 26, free rod 27, guide hole 271; Telescopic rod 3, protrusion 31, guide rod 32, positioning rod 33, operating cap 34, second compression spring 35; A pressure plate 4, a pressure rod 41, a rotation slot 42, and a third compression spring 43; Push rod 5, push rod head 51, elastic plate 52; The gate plate 6 , the outer positioning block 61 , the locking hole 62 , the free hole 63 , the top block 64 , and the connecting groove 65 . DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0019] Please see attached Figure 1 To Attachment Fig.11 As shown, the present invention provides an opening control device for a gate valve, comprising: A valve seat 1, a valve cover 11 is fixedly installed above the valve seat 1, a hand wheel 12 is rotatably installed above the valve cover 11, a stepped sleeve 13 and a telescopic frame 14 are fixedly arranged inside the valve seat 1, the stepped sleeve 13 is arranged at the inlet end of the valve seat 1, the inner diameter of the stepped sleeve 13 is arranged in multiple groups, the inner diameter of the stepped sleeve 13 gradually increases from the end close to the inlet of the valve seat 1 to the direction close to the outlet end of the valve seat 1, multiple groups of telescopic frames 14 are arranged, and multiple groups of telescopic frames 14 are distributed in a circular array on the side wall of the valve seat 1, the telescopic frames 14 are arranged on one side of the stepped sleeve 13 close to the outlet end of the valve seat 1, a pressure plate 4 is arranged inside the stepped sleeve 13, the diameter of the pressure plate 4 is larger than the minimum inner diameter of the stepped sleeve 13, the pressure plate 4 is sealed and fitted with the inner wall of the stepped sleeve 13, the pressure rod 41 is arranged on the side of the pressure plate 4 facing the outlet end of the valve seat 1, and the surface of the pressure plate 4 is installed with multiple groups of pressure rods Rod 41, multiple groups of compression rods 41 are respectively slidably inserted into the interior of multiple groups of telescopic frames 14, one group of compression rods 41 is located directly below the interior of the valve seat 1, and the end of the compression rod 41 located directly below the interior of the valve seat 1 away from the compression plate 4 is provided with a rotation groove 42, the end of the rotation groove 42 away from the compression plate 4 is arranged in a slope shape, a third compression spring 43 is arranged between the compression plate 4 and the telescopic frame 14, the third compression spring 43 is sleeved on the surface of the compression rod 41, one group of compression rods 41 is rotatably connected with a push rod 5 at the end, the push rod 5 is rotatably connected to the compression rod 41 located directly below the interior of the valve seat 1 through the rotation groove 42, the end of the push rod 5 away from the compression rod 41 is fixedly connected with a push rod head 51, the surface of the push rod 5 close to the end of the compression rod 41 is fixedly connected with an elastic plate 52, and the end of the elastic plate 52 away from the push rod 5 is embedded and installed on the surface of the compression rod 41; The valve stem 2 is arranged inside the valve cover 11, the valve stem 2 is threadedly connected to the hand wheel 12, a telescopic hole 21 is opened inside the valve stem 2, a first positioning groove 22 and a second positioning groove 23 are opened on the side of the top of the valve stem 2, the bottom ends of the first positioning groove 22 and the second positioning groove 23 are communicated, and the first positioning groove 22 and the second positioning groove 23 are communicated with the telescopic hole 21, an inner positioning block 24 is fixedly connected to the bottom end of the valve stem 2, a locking rod 25 is arranged inside the inner positioning block 24, a telescopic groove 241 is opened inside the inner positioning block 24, two groups of telescopic blocks 251 are slidably arranged inside the telescopic groove 241, the opposite sides of the two groups of telescopic blocks 251 are fixedly connected to the locking rod 25, a first compression spring 26 is sleeved on the surface of the locking rod 25, the first compression spring 26 is located between the telescopic block 251 and the side wall of the telescopic groove 241, and the end of the locking rod 25 away from the telescopic block 251 passes through the inner positioning block The surface of the positioning block 24 and the bottom of the inner positioning block 24 are fixedly connected with a free rod 27, a guide hole 271 is opened inside the free rod 27, and the guide hole 271 is communicated with the telescopic slot 241. A telescopic rod 3 is arranged inside the valve stem 2, and a protrusion 31 is fixedly installed on the surface of the telescopic rod 3. The telescopic rod 3 is slidably inserted into the inside of the telescopic hole 21. A positioning rod 33 is fixedly connected to the surface of the telescopic rod 3. After the positioning rod 33 extends to the outside of the valve stem 2, an operating cap 34 is fixedly connected. The operating cap 34 is slidably sleeved on the top of the valve stem 2. Two groups of protrusions 31 are provided, and the two groups of protrusions 31 are symmetrically arranged on the sides of the telescopic rod 3. The protrusions 31 are arranged inside the telescopic slot 241. The end of the protrusion 31 away from the telescopic rod 3 is fixedly connected with a guide rod 32, and the guide rod 32 is slidably inserted into the inside of the guide hole 271. The end of the protrusion 31 away from the telescopic rod 3 is provided with a second compression spring 35; The gate plate 6 is arranged inside the valve seat 1, and an external positioning block 61 is arranged on the top of the gate plate 6. Two groups of external positioning blocks 61 are arranged, and the two groups of external positioning blocks 61 are symmetrically arranged on both sides of the internal positioning block 24. A locking hole 62 is opened on the surface of the external positioning block 61, and the locking hole 62 is opened on the opposite side of the two groups of external positioning blocks 61. The locking hole 62 is arranged corresponding to the locking rod 25. A free hole 63 is opened on the surface of the gate plate 6, and the free hole 63 is located between the two groups of external positioning blocks 61, and the free hole 63 runs through the gate plate 6. A top block 64 is fixedly installed on the surface of the gate plate 6, and the top block 64 is located on the side of the gate plate 6 close to the top rod 5. A connecting groove 65 is opened at the bottom of the top block 64, and the top block 64 abuts against the top rod head 51 through the connecting groove 65.

[0020] The present invention provides an opening control device for a gate valve. When in use, the two ends of a valve seat 1 are connected to a pipeline, and the valve stem 2 is driven to rise or fall by rotating a hand wheel 12. The valve stem 2 drives an inner positioning block 24 and a free rod 27 to rise and fall synchronously. The maximum opening of the gate plate 6 is changed by changing the distance between the inner positioning block 24 and the gate plate 6. When the flow rate of the fluid in the pipeline needs to be increased, only the opening of the most upstream group of gate valves needs to be increased. The flow rate of the fluid in the pipeline increases according to the opening of the most upstream gate valve, thereby increasing the pressure of the fluid in the pipeline. The pressure plate 4 in the downstream gate valve is affected by the fluid pressure in the pipeline and moves toward a position close to the gate plate 6. During the movement of the pressure plate 4, the pressure rod 41 is driven to approach the gate plate 6. After the push rod 5 is compressed, the end away from the pressure rod 41 flips upward, so that the push rod head 51 pushes the gate plate 6 upward through the push block 64, thereby achieving the purpose of changing the flow rate of the fluid in the entire pipeline by adjusting the opening of the most upstream group of gate valves. The operation is simple.

[0021] As a further improvement of the present invention, the maximum opening of the gate 6 is controlled by controlling the rising height of the inner positioning block 24. When the pressure of the fluid in the pipeline increases, the gate 6 can adjust the opening automatically within the set opening range, thereby changing the opening in real time according to the pressure of the fluid in the pipeline.

[0022] As a further improvement of the present invention, when it is necessary to manually control a group of gate valves, the inner positioning block 24 is driven to be completely inserted between the two groups of outer positioning blocks 61 by rotating the hand wheel 12, and then the positioning rod 33 is driven to move from the inside of the second positioning groove 23 to the inside of the first positioning groove 22 by pressing and rotating the operating cap 34. The positioning rod 33 drives the telescopic rod 3 to rotate, so that the protrusion 31 squeezes the telescopic blocks 251 on both sides, and drives the locking rod 25 to be inserted into the inside of the locking hole 62, thereby realizing the locking between the inner positioning block 24 and the outer positioning block 61. At this time, the hand wheel 12 can be turned to realize manual control of the opening of the gate 6.

[0023] As a further improvement of the present invention, by providing an elastic plate 52, the push rod 5 is always subjected to downward pressure, thereby preventing the push rod 5 from folding toward the pressure plate 4 when the gate valve is transported, thereby affecting normal use.

[0024] When the gate valve opening control device of the present invention is used, the two ends of the valve seat 1 are connected to the pipeline, and the valve stem 2 is driven to rise or fall by rotating the hand wheel 12. The valve stem 2 drives the inner positioning block 24 and the free rod 27 to rise and fall synchronously, and the maximum opening of the gate plate 6 is changed by changing the distance between the inner positioning block 24 and the gate plate 6. When the flow rate of the fluid in the pipeline needs to be increased, it is only necessary to increase the opening of the most upstream group of gate valves. The fluid in the pipeline increases the flow rate according to the opening of the most upstream gate valve, thereby increasing the pressure of the fluid in the pipeline. The pressure plate 4 in the downstream gate valve is affected by the fluid pressure in the pipeline and moves to a position close to the gate plate 6. During the movement of the pressure plate 4, the pressure rod 41 is driven to approach the gate plate 6, and the push rod 5 is pressed away from the pressure rod 41. One end is flipped upward so that the push rod head 51 pushes the gate plate 6 upward through the push block 64, thereby achieving the purpose of changing the flow rate of the fluid in the entire pipeline by only adjusting the opening of the uppermost group of gate valves. When a group of gate valves needs to be manually controlled, the inner positioning block 24 is driven to be completely inserted between the two groups of outer positioning blocks 61 by turning the hand wheel 12, and then the positioning rod 33 is driven to move from the inside of the second positioning groove 23 to the inside of the first positioning groove 22 by pressing and rotating the operating cap 34. The positioning rod 33 drives the telescopic rod 3 to rotate, so that the protrusion 31 squeezes the telescopic blocks 251 on both sides, and drives the locking rod 25 to be inserted into the inside of the locking hole 62, so as to achieve locking between the inner positioning block 24 and the outer positioning block 61. At this time, the opening of the gate plate 6 can be manually controlled by turning the hand wheel 12.

[0025] It should be understood by those skilled in the art that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0026] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gate valve opening control device, characterized in that: include: A valve seat (1), a valve cover (11) is fixedly mounted above the valve seat (1), a hand wheel (12) is rotatably mounted above the valve cover (11), a stepped sleeve (13) and a telescopic frame (14) are fixedly mounted inside the valve seat (1), a pressure plate (4) is disposed inside the stepped sleeve (13), a plurality of groups of pressure rods (41) are mounted on the surface of the pressure plate (4), and a push rod (5) is rotatably connected to the end of one group of the pressure rods (41); A valve stem (2), the valve stem (2) being arranged inside the valve cover (11), the valve stem (2) being threadedly connected to the hand wheel (12), the bottom end of the valve stem (2) being fixedly connected to an inner positioning block (24), a locking rod (25) being arranged inside the inner positioning block (24), a free rod (27) being fixedly connected to the bottom of the inner positioning block (24), a telescopic rod (3) being arranged inside the valve stem (2), a protrusion (31) being fixedly mounted on the surface of the telescopic rod (3); A gate plate (6), the gate plate (6) being arranged inside the valve seat (1), an external positioning block (61) being arranged on the top of the gate plate (6), a locking hole (62) being provided on the surface of the external positioning block (61), a free hole (63) being provided on the surface of the gate plate (6), and a top block (64) being fixedly mounted on the surface of the gate plate (6).

2. The gate valve opening control device according to claim 1, characterized in that: The stepped sleeve (13) is arranged at the inlet end of the valve seat (1), and the inner diameter of the stepped sleeve (13) is arranged in a plurality of groups, and the inner diameter of the stepped sleeve (13) gradually increases from an end close to the inlet of the valve seat (1) toward an outlet end close to the valve seat (1).

3. The gate valve opening control device according to claim 2, characterized in that: The telescopic frames (14) are provided in a plurality of groups, and the plurality of telescopic frames (14) are distributed in a circular array on the side wall of the valve seat (1), and the telescopic frames (14) are provided on a side of the stepped sleeve (13) close to the outlet end of the valve seat (1).

4. The gate valve opening control device according to claim 3, characterized in that: The diameter of the pressure plate (4) is larger than the minimum inner diameter of the stepped sleeve (13); the pressure plate (4) is sealed against the inner wall of the stepped sleeve (13); the pressure rod (41) is arranged on the side of the pressure plate (4) facing the outlet end of the valve seat (1); a plurality of groups of pressure rods (41) are respectively slidably inserted into the interior of a plurality of groups of telescopic frames (14); one group of the pressure rods (41) is located directly below the interior of the valve seat (1); and a rotation groove (42) is provided at one end of the pressure rod (41) located directly below the interior of the valve seat (1) away from the pressure plate (4); and the rotation groove (42) is arranged in a slope shape at one end away from the pressure plate (4); a third compression spring (43) is arranged between the pressure plate (4) and the telescopic frame (14); and the third compression spring (43) is sleeved on the surface of the pressure rod (41).

5. The gate valve opening control device according to claim 4, characterized in that: The push rod (5) is rotatably connected to the pressure rod (41) located directly below the inside of the valve seat (1) through the rotating groove (42); the end of the push rod (5) away from the pressure rod (41) is fixedly connected to a push rod head (51); the surface of the push rod (5) close to the pressure rod (41) is fixedly connected to an elastic plate (52); the end of the elastic plate (52) away from the push rod (5) is embedded and installed in the surface of the pressure rod (41).

6. The gate valve opening control device according to claim 5, characterized in that: A telescopic hole (21) is provided inside the valve stem (2), and a first positioning groove (22) and a second positioning groove (23) are provided on the side surface of the top of the valve stem (2), the first positioning groove (22) and the second positioning groove (23) are connected at their bottom ends, and the first positioning groove (22) and the second positioning groove (23) are connected to the telescopic hole (21).

7. The gate valve opening control device according to claim 6, characterized in that: A telescopic groove (241) is provided inside the inner positioning block (24), and two groups of telescopic blocks (251) are slidably arranged inside the telescopic groove (241). The two groups of telescopic blocks (251) are fixedly connected to the locking rod (25) on opposite sides. A first compression spring (26) is sleeved on the surface of the locking rod (25), and the first compression spring (26) is located between the telescopic block (251) and the side wall of the telescopic groove (241). One end of the locking rod (25) away from the telescopic block (251) passes through the surface of the inner positioning block (24).

8. The gate valve opening control device according to claim 7, characterized in that: A guide hole (271) is provided inside the free rod (27), and the guide hole (271) is communicated with the telescopic slot (241).

9. The gate valve opening control device according to claim 8, characterized in that: The telescopic rod (3) is slidably inserted into the interior of the telescopic hole (21); a positioning rod (33) is fixedly connected to the surface of the telescopic rod (3); the positioning rod (33) is fixedly connected to an operating cap (34) after extending to the outside of the valve stem (2); the operating cap (34) is slidably sleeved on the top of the valve stem (2); two groups of protrusions (31) are provided; the two groups of protrusions (31) are symmetrically arranged on the side surfaces of the telescopic rod (3); the protrusions (31) are arranged inside the telescopic groove (241); one end of the protrusion (31) away from the telescopic rod (3) is fixedly connected to a guide rod (32); the guide rod (32) is slidably inserted into the interior of the guide hole (271); and one end of the protrusion (31) away from the telescopic rod (3) is provided with a second compression spring (35).

10. The gate valve opening control device according to claim 9, characterized in that: The outer positioning blocks (61) are provided in two groups. The two groups of the outer positioning blocks (61) are symmetrically arranged on both sides of the inner positioning block (24). The locking holes (62) are provided on opposite sides of the two groups of the outer positioning blocks (61). The locking holes (62) are provided corresponding to the locking rods (25). The free holes (63) are located between the two groups of the outer positioning blocks (61). The free holes (63) penetrate the gate plate (6). The top block (64) is located on a side of the gate plate (6) close to the top rod (5). A connecting groove (65) is provided at the bottom of the top block (64). The top block (64) abuts against the top rod head (51) through the connecting groove (65).

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