Lead screw rotating type sealing stop valve

Abstract

The utility model relates to the technical field of PPR stop valves, in particular to a lead screw rotating type sealing stop valve which comprises a valve body, a valve cover, a valve element and a driving piece, the valve body comprises a water inlet cavity, an exchange cavity and a water outlet cavity, the water inlet cavity and the water outlet cavity are located at the two ends of the exchange cavity respectively, the valve cover is located at the exchange cavity and fixedly connected with the valve body, and an installation hole is formed in the valve cover. The valve element penetrates through the mounting hole and is in sliding connection with the valve cover, the driving piece is provided with a lead screw part, the valve element comprises a connecting part and a sealing part, a through hole is formed in the connecting part, the lead screw part is in threaded connection with the through hole, the pressure-bearing piece and the first sealing piece are further included, the through hole penetrates through the connecting part and the sealing part, and the pressure-bearing piece is installed on the sealing part; the end face of the pressure bearing piece is flush with the end face of the sealing part, and the first sealing piece is fixedly connected with the sealing part. According to the utility model, the compressive strength of the sealing surface for bearing water pressure at the bottom end of the valve core can be effectively improved on the premise that the valve core facilitates chip removal when threads are machined.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of PPR stop valve, more particularly to a screw rotation type sealing stop valve. BACKGROUND

[0002] The PPR stop valve is mainly composed of a PPR valve body, a copper insert, a valve cover, a valve core, a screw rod and a sealing gasket; the copper insert, the valve cover, the valve core and the screw rod are all made of brass and are processed by red punching. First, the volume of the required material is theoretically calculated, and then the diameter and length of the copper bar are determined; the required length of the copper bar is cut by a cutting machine, and then the copper bar is heated to about 760 degrees Celsius and is punched into a mold (the mold needs to be preheated to 200-300 DEG C) ; after cooling, burrs are removed, the surface is shot-blasted to remove the oxide skin, the surface is cleaned, machined, and the copper insert is assembled and pressure tested after injection molding; the valve core moves up and down under the screw of the screw rod to open and close the valve. However, since the screw rod needs to be threadedly connected with the valve core to achieve screwing up and down, it is required to tap threads in the valve core. Since the nominal diameter of the hole in the valve core is generally small, it is difficult to tap threads in the hole. In order to facilitate chip removal, the hole in the valve core is usually designed as a through hole. However, due to the presence of the through hole, the compression strength of the sealing surface at the bottom end of the valve core will be reduced.

[0003] The prior art discloses a new type of flange stop valve (authorized publication number CN215720865U), which comprises a valve body, a flange connected to the top end of the valve body, a second cylinder connected to the valve body through the flange, a pair of fixed frames welded to one side of the outer wall of the second cylinder, a first cylinder welded to the top end of the pair of fixed frames, a screw rod threadedly connected to the inside of the first cylinder, the screw rod penetrating through the second cylinder and the valve body at the bottom end and being provided with a connecting seat, a sealing plug installed at the bottom end of the connecting seat, a permeation prevention pipe slidably connected to one side of the inner wall of the second cylinder and provided with an annular groove at the bottom end for clamping the connecting seat, a gland connected to the top end of the permeation prevention pipe, a pair of adjusting frames welded to one side of the second cylinder close to the gland, a pin shaft inserted between the pair of adjusting frames, and a threaded rod movably connected to the pair of adjusting frames through the pin shaft, and the threaded rod penetrating through the first cylinder at the top end.

[0004] In the above prior art, in order to solve the problem of tapping and chip removal, the valve core is divided into three parts, i.e. the first cylinder, the second cylinder and the connecting seat, the screw rod penetrates through the through holes of the three parts, and the sealing plug is installed at the bottom end face of the screw rod. The disadvantages of this scheme are as follows: first, the valve core is not a one-piece type, so multiple combined parts need to be machined separately during machining, which has a high machining cost; second, the screw rod is generally made of a non-pressure-resistant material, and the cross-sectional area of the screw rod is relatively small, so the compression strength is low, which causes the screw rod to be easily broken when it bears high pressure in the valve body. If the screw rod is made of a pressure-resistant material, the cost will also increase. UTILITY MODEL CONTENTS

[0005] The utility model discloses a screw rod rotating type sealing stop valve which can effectively improve the compression strength of the sealing surface of the bottom end of the valve core under the premise of chip removal when the valve core is convenient for processing threads.

[0006] To solve the above technical problems, the utility model adopts the technical scheme of:

[0007] Provide a screw rod rotating type sealing stop valve, including valve body, valve cover, valve core and driving part, the valve body includes water inlet cavity, exchange cavity and water outlet cavity, the water inlet cavity with the water outlet cavity is located exchange cavity's both ends respectively, the valve cover is located exchange cavity place with the valve body fixed connection, the valve cover is provided with mounting hole, the valve core passes through the mounting hole and is connected with the valve cover sliding, the driving part is provided with screw rod part, the screw rod part is connected with the valve cover rotation, the valve core includes connecting part and sealing part, the sealing part is located in the exchange cavity, the connecting part is provided with through -hole, the screw rod part is connected with the through -hole screw, still include pressure -bearing piece and first sealing piece, the through -hole is through the connecting part with the sealing part, the pressure -bearing piece is installed on the sealing part and closes the through -hole, the end surface of pressure -bearing piece is flush with the end surface of sealing part, the first sealing piece is fixedly connected with the end surface of the sealing part away from the connecting part side.

[0008] In the working process of the above scheme, the worker can tap threads in the through -hole of one end of the valve core, and the iron filings generated by tapping threads can be discharged through the other end of the through -hole. After completing the thread processing, the pressure -bearing piece can be press -fitted and fixed on the end surface of the sealing part by riveting process to close the through -hole on the end surface. After completing the press -fitting and fixing, the first sealing piece is installed and fixed on the end surface of the sealing part by bonding, vulcanization and other methods. In use, the driving part is rotated, the screw rod part of the driving part drives the valve core to slide in the valve cover to open and close the exchange cavity. When the exchange cavity is in the open state, the water flow flows from the water inlet cavity, passes through the exchange cavity and flows out to the water outlet cavity. When the water flow is in the exchange cavity, the water exerts pressure on the end surface of the first sealing piece. Under the action of the pressure -bearing piece, the compression strength of the first sealing piece at the bottom end of the valve core is significantly improved, and the first sealing piece can effectively resist water pressure without being crushed.

[0009] Further, the through hole is provided with a groove portion at the end face of the sealing portion, the pressure bearing member is a plate-shaped member, the pressure bearing member is installed in the groove portion and is fixedly connected with the groove portion; the connecting portion and the sealing portion of the valve core are integrally formed, the sealing portion is in the form of a disc, the groove is arranged at the center of the disc, and in processing, a riveting process is adopted, an equipment is used to impact the pressure bearing member, the profile of the groove portion is deformed by the pressure bearing member, the pressure bearing member is pressed into the groove, and the whole processing process can be completed by executing stamping once by using a small stamping equipment, which is convenient and fast.

[0010] Further, the first sealing member is made of rubber, and the first sealing member is fixedly connected with the sealing portion through vulcanization; the metal member and the rubber member are combined and fixed through the vulcanization process, a plurality of valve cores can be vulcanized in batches, the fixing effect is more stable, and processing is more convenient.

[0011] Further, the buffer pad used for abutting against the connecting portion is further included, the driving member is provided with a mounting groove at the end of the lead screw portion, and the buffer pad is installed in the mounting groove and in contact with the top end of the connecting portion; in the process of rotating the lead screw, the connecting portion of the valve core slides in the valve cover in the axial direction of the lead screw, and engineering practical use shows that, in the process of opening the valve core, when the top of the connecting portion is in contact with the threaded end of the lead screw portion away from the first sealing member, mutual extrusion locking phenomenon often occurs, and the buffer pad can effectively avoid the locking phenomenon of the top of the connecting portion and the threaded end of the lead screw portion.

[0012] Further, the support pad is further included, the driving member is provided with a limiting protrusion used for abutting against the buffer pad, one end of the mounting hole is provided with a boss portion, one end of the support pad is in abutment with the side end face of the limiting protrusion away from the mounting groove, and the other end of the support pad can be used for abutting against the end face of the boss portion; the limiting protrusion provides top support for the lead screw portion, so that the lead screw portion does not slide out and the whole driving member is separated from the valve core, and the support pad buffers the contact pressure of the boss portion and the limiting protrusion to avoid crushing the contact surface.

[0013] Further, the driving member further includes a connecting shaft portion and a hand wheel portion, one end of the connecting shaft portion is connected with the lead screw portion, and the other end is fixedly connected with the hand wheel portion; the end of the connecting shaft portion can be provided with threads, and the hand wheel portion can be threadedly connected with the connecting portion, the complex hand wheel portion can be separately processed in processing, and the processing difficulty is reduced.

[0014] Further, the second sealing member is further included, a plurality of clamping grooves are arranged on the wall surface of the connecting shaft portion, the second sealing member is installed in the clamping grooves, and the second sealing member is in abutment with the wall surface of the mounting hole; effective sealing is formed between the connecting shaft portion and the mounting hole through the second sealing member to avoid water leakage.

[0015] Further, the connecting part is provided with a threaded section, and the screw rod part is in threaded connection with the threaded section; the threaded section of the connecting part is used for transmission, so that the screw rod can drive the valve core through threaded transmission; therefore, only part of the wall surface of the shaft end on the inner wall of the through hole of the connecting part is provided with threads, the time for processing threads is reduced, and the processing efficiency is effectively improved.

[0016] Further, the connecting part is provided with a threaded section, and the screw rod part is in threaded connection with the threaded section; the threaded section of the connecting part is used for transmission, so that the screw rod can drive the valve core through threaded transmission; therefore, only part of the wall surface of the shaft end on the inner wall of the through hole of the connecting part is provided with threads, the time for processing threads is reduced, and the processing efficiency is effectively improved.

[0017] Further, the connecting part is provided with a threaded section, and the screw rod part is in threaded connection with the threaded section; the threaded section of the connecting part is used for transmission, so that the screw rod can drive the valve core through threaded transmission; therefore, only part of the wall surface of the shaft end on the inner wall of the through hole of the connecting part is provided with threads, the time for processing threads is reduced, and the processing efficiency is effectively improved.

[0018] Compared with the prior art, the utility model has the advantages that:

[0019] 1. Through the setting pressure -bearing piece and first sealing piece, the through hole penetrates the connecting part and the sealing part, the pressure -bearing piece is installed on the sealing part and closes the through hole, the end face of the pressure -bearing piece is flush with the end face of the sealing part, the first sealing piece is fixedly connected with the end face of the sealing part away from the connecting part, when water flows in the exchange cavity, water exerts pressure on the end face of the first sealing piece, under the action of the pressure -bearing piece, the pressure -resisting strength of the first sealing piece at the bottom end of the valve core under water pressure is significantly improved, and the first sealing piece can effectively resist water pressure without being crushed.

[0020] 2. Through the setting buffer pad, the shaft section away from the screw rod part of the driving piece is provided with a mounting groove, and the buffer pad is installed in the mounting groove, so that the threaded end of the connecting part and the screw rod part can be effectively prevented from being locked. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structure explosion map of the screw rod rotating type sealing stop valve;

[0022] Figure 2 It is a sectional view of the screw rod rotating type sealing stop valve;

[0023] Figure 3 It is Figure 2 It is a local enlarged view of A in the middle;

[0024] Figure 4 It is an internal structure schematic view of the valve core of the screw rod rotating type sealing stop valve.

[0025] In the drawings: 1, valve body; 110, water inlet cavity; 120, exchange cavity; 130, water outlet cavity; 2, valve cover; 210, mounting hole; 220, boss part; 3, valve core; 310, connecting part; 311, threaded section; 312, through hole; 320, sealing part; 330, recessed part; 340, first sealing element; 4, driving element; 410, screw rod part; 420, connecting shaft part; 421, clamping groove; 430, hand wheel part; 440, mounting groove; 450, limiting protrusion; 460, second sealing element; 5, pressure bearing element; 6, buffer pad; 7, support pad; 8, embedded element; 810, third sealing element. DETAILED DESCRIPTION

[0026] The utility model will be further explained in connection with specific implementation. Among them, the drawings are only for example explanation, show only the schematic diagram, and can not be understood as the restriction of the patent; in order to better illustrate the embodiment of the utility model, some components of the drawings will be omitted, enlarged or reduced, and the size of actual product is not represented; for those skilled in the art, some well-known structure and its description in the drawings can be omitted and understood.

[0027] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, a particular orientation and operation, therefore the position relationship of the term described in the drawings is only for example explanation, and can not be understood as the restriction of the patent, for the ordinary skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0028] Embodiment 1

[0029] The embodiment is a first embodiment of screw rod rotation type sealing stop valve, as shown in Figures 1 to 4As shown, including valve body 1, valve cover 2, valve core 3 and driving member 4, valve body 1 includes water inlet cavity 110, exchange cavity 120 and water outlet cavity 130, water inlet cavity 110 and water outlet cavity 130 are located at both ends of exchange cavity 120 respectively, valve cover 2 is fixedly connected with valve body 1 at exchange cavity 120, valve cover 2 is provided with mounting hole 210, valve core 3 passes through mounting hole 210 and is slidably connected with valve cover 2, driving member 4 is provided with screw rod part 410, screw rod part 410 is rotatably connected with valve cover, valve core 3 includes connecting part 310 and sealing part 320, sealing part 320 is located in exchange cavity 120, connecting part 310 is provided with through hole 312, screw rod part 410 is threadedly connected with through hole 312, further comprising pressure bearing 5 and first sealing member 340, through hole 312 penetrates connecting part 310 and sealing part 320, pressure bearing 5 is installed on sealing part 320 and closes through hole 312, the end face of pressure bearing 5 is flush with the end face of sealing part 320, first sealing member 340 is fixedly connected with the end face of sealing part 320 away from connecting part 310.

[0030] Specifically, the through hole 312 is provided with a groove part 330 at the end face of the sealing part 320, the pressure bearing 5 is a plate-shaped part, the pressure bearing 5 is installed in the groove part 330 and fixedly connected with the groove part 330; the connecting part 310 and the sealing part 320 of the valve core 3 are integrally formed, the sealing part 320 is in the form of a disc, the groove is arranged at the center of the disc, during processing, the riveting process is adopted, the equipment is used to impact the pressure bearing 5, the pressure bearing 5 deforms the profile of the groove part 330, so that the pressure bearing 5 is pressed into the groove, the whole processing process only needs to use a small stamping equipment to complete the stamping once, which is convenient and fast.

[0031] Specifically, the first sealing member 340 is made of rubber, and the first sealing member 340 is fixedly connected with the sealing part 320 by vulcanization; the vulcanization process is used to combine and fix the metal part and the rubber part, a plurality of valve cores 3 can be vulcanized at one time, the fixing effect is more stable and the processing is more convenient.

[0032] Specifically, the connecting part 310 is provided with a threaded segment 311, and the screw rod part 410 is threadedly connected with the threaded segment 311; the threaded segment 311 of the connecting part 310 is used for transmission, so that the screw rod can drive the valve core 3 through threaded transmission, therefore, only part of the wall surface of the shaft end on the inner wall of the through hole 312 of the connecting part 310 needs to be provided with threads, the time for processing threads is reduced, and the processing efficiency is effectively improved.

[0033] The working principle of the screw rod rotating type sealing stop valve of the embodiment is as follows:

[0034] In the process of machining, the worker can thread the hole 312 at one end of the valve core 3, and the iron filings generated by threading can be discharged through the other end of the hole 312. After the threading is completed, the pressure-bearing part 5 can be press-fitted and fixed on the end face of the sealing part 320 by processes such as riveting to close the hole 312 on the end face. After the press-fitting and fixing are completed, the first sealing part 340 is installed and fixedly connected with the sealing part 320 by a vulcanization process. In use, the driving part 4 is rotated, the screw rod part 410 drives the valve core 3 to slide in the valve cover 2 to open the exchange cavity 120, water enters the water inlet cavity 110, passes through the exchange cavity 120, and enters the water outlet cavity 130, and the pressure-bearing plate bears the pressure of the first sealing part 340.

[0035] The beneficial effects of the embodiment are that the pressure resistance of the first sealing part 340 at the bottom end of the valve core 3 is significantly improved under the action of the pressure-bearing part 5, and the first sealing part 340 can effectively resist water pressure without being crushed.

[0036] Embodiment 2

[0037] The second embodiment of the screw rod rotating type sealing stop valve is shown in Figures 2 to 3 The difference between the second embodiment and the first embodiment is that:

[0038] Specifically, the buffer pad 6 can be used to abut against the connecting part 310. The driving part 4 is provided with a mounting groove 440 at the end of the screw rod part 410. The mounting groove 440 is an annular groove around the outer surface of the shaft end of the screw rod part 410. The buffer pad 6 is installed in the mounting groove 440 and contacts the top end of the connecting part 310. During the rotation of the screw rod, the screw rod does not move axially, but the connecting part 310 of the valve core 3 slides in the valve cover 2. Engineering practice shows that during the opening of the valve core 3, when the top of the connecting part 310 contacts the threaded end of the screw rod part 410 away from the first sealing part 340, mutual extrusion locking often occurs. The buffer pad 6 can effectively prevent the top of the connecting part 310 from contacting the threaded end of the screw rod part 410 and locking.

[0039] Specifically, the supporting pad 7 is provided. The driving part 4 is provided with a limiting protrusion 450 for abutting against the buffer pad 6. One end of the mounting hole 210 is provided with a boss part 220. One end of the supporting pad 7 abuts against the side end face of the limiting protrusion 450 away from the mounting groove 440, and the other end of the supporting pad 7 can abut against the end face of the boss part 220. The limiting protrusion 450 provides top support for the screw rod part 410 to prevent the screw rod part 410 from sliding out and causing the entire driving part 4 to separate from the valve core 3. The supporting pad 7 buffers the contact pressure between the boss part 220 and the limiting protrusion 450 to prevent crushing the contact surface.

[0040] Specifically, the driving member 4 further comprises a connecting shaft part 420 and a hand wheel part 430, one end of the connecting shaft part 420 is connected with the screw part 410, and the other end is fixedly connected with the hand wheel part 430; the end of the connecting shaft part 420 can be provided with a thread, and the hand wheel part 430 can be threadedly connected with the connecting part 310; in the machining process, the complex hand wheel part 430 can be machined separately, thereby reducing the machining difficulty.

[0041] Specifically, the second sealing member 460 is further included, a plurality of clamping grooves 421 are arranged on the wall surface of the connecting shaft part 420, the second sealing member 460 is installed in the clamping groove 421, and the second sealing member 460 abuts against the wall surface of the mounting hole 210; the connecting shaft part 420 and the mounting hole 210 are effectively sealed by the second sealing member 460 to avoid water leakage.

[0042] The working principle of the screw rotation type sealing stop valve of the embodiment is as follows:

[0043] In the opening process of the valve core 3, the connecting part 310 slides and rises in the valve cover 2 under the rotation of the screw part 410, when rising to the top end, the limiting protrusion 450 limits the screw part 410, the top end of the connecting part 310 forms pressure contact with the buffer pad 6, the buffer pad 6 deforms, and the top end of the connecting part 310 closely adheres to the buffer pad 6 along the deformation of the buffer pad 6 to form soft contact; when it is needed to reversely rotate to close the valve, the top end of the connecting part 310 can easily separate from the buffer pad 6, and the buffer pad 6 restores the deformation.

[0044] The beneficial effect of the embodiment is that by arranging the buffer pad 6, the driving member 4 is arranged with the mounting groove 440 at the end of the screw part 410, the buffer pad 6 is installed in the mounting groove 440 and contacts the top end of the connecting part 310, and the contact locking phenomenon of the top of the connecting part 310 and the thread end of the screw part 410 can be effectively avoided.

[0045] Embodiment 3

[0046] The embodiment is a second embodiment of a screw rotation type sealing stop valve, as shown in Figures 1 to 2 The difference from the first embodiment is that:

[0047] Specifically, the insert 8 and the third sealing member 810 are further included, the valve cover 2 and the exchange cavity 120 are fixedly connected through the insert 8, and the valve cover 2 and the insert 8 are sealed through the third sealing member 810; the insert 8 is embedded on the inner wall of the exchange cavity 120, the inner wall of the insert 8 is provided with a thread, the insert 8 and the valve cover 2 are fixedly installed through the thread connection, and the insert 8 and the valve cover 2 are sealed through the third sealing member 810 to avoid water leakage at the thread connection.

[0048] Specifically, the material of the insert 8, the valve cover 2, the valve core 3 and the screw rod part 410 is stainless steel; the stainless steel has high strength, the copper metal used in general process is replaced by the stainless steel, the weight of the metal part can be reduced by about 20%, the entire stop valve is more lightweight and the cost is reduced, the thread processed on the stainless steel is not easy to slip, and the overall sealing performance can be improved.

[0049] The working principle of the screw rod rotating type sealing stop valve of the embodiment is as follows:

[0050] In the processing process, the insert 8 is placed in the mold for injection molding, so that the insert 8 is attached to the inner wall surface of the exchange cavity 120, then the third sealing piece 810 is installed on the valve cover 2, and finally the valve cover 2 is screwed in, so that the valve cover 2 and the insert 8 are fixed and installed.

[0051] The beneficial effects of the embodiment are as follows: the material of the insert 8, the valve cover 2, the valve core 3 and the screw rod part 410 is stainless steel, so that the entire stop valve is more lightweight and the cost is reduced, and the thread processed on the stainless steel is not easy to slip, and the overall sealing performance can be improved.

[0052] In the specific content of the above specific embodiments, any non-contradictory combination of technical features can be made, in order to make the description simple, all possible combinations of the above technical features are not described, however, as long as the combination of these technical features does not exist contradiction, it should be considered that it is within the scope of the present application.

[0053] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not a limitation on the embodiments of the present application. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A screw rotation type sealing stop valve, comprising a valve body (1), a valve cover (2), a valve core (3) and a driving member (4), the valve body (1) comprises a water inlet cavity (110), an exchange cavity (120) and a water outlet cavity (130), the water inlet cavity (110) and the water outlet cavity (130) are respectively located at both ends of the exchange cavity (120), the valve cover (2) is fixedly connected with the valve body (1) at the exchange cavity (120), the valve cover (2) is provided with a mounting hole (210), the valve core (3) passes through the mounting hole (210) and is slidably connected with the valve cover (2), the driving member (4) is provided with a screw rod part (410), the screw rod part (410) is rotationally connected with the valve cover (2), the valve core (3) comprises a connecting part (310) and a sealing part (320), the sealing part (320) is located in the exchange cavity (120), the connecting part (310) is provided with a through hole (312), the screw rod part (410) is threadedly connected with the through hole (312), characterized in that, Further comprising a pressure bearing piece (5) and a first sealing piece (340), the through hole (312) penetrates the connecting part (310) and the sealing part (320), the pressure bearing piece (5) is installed on the sealing part (320) and closes the through hole (312), the end surface of the pressure bearing piece (5) is flush with the end surface of the sealing part (320), and the first sealing piece (340) is fixedly connected with the end surface of the sealing part (320) away from the connecting part (310).

2. The rotary plug valve according to claim 1, wherein The end surface of the sealing part (320) is provided with a groove part (330) at the position connected with the through hole (312), the pressure bearing piece (5) is a plate-shaped piece, the pressure bearing piece (5) is installed in the groove part (330) and is fixedly connected with the groove part (330).

3. The rotary plug valve according to claim 1, wherein The first sealing piece (340) is made of rubber material, and the first sealing piece (340) is fixedly connected with the sealing part (320) through vulcanization.

4. The rotary plug valve according to claim 1, wherein Further comprising a buffer pad (6) used for abutting against the connecting part (310), and the driving piece (4) is provided with a mounting groove (440) at the end of the lead screw part (410), the buffer pad (6) is installed in the mounting groove (440) and is in contact with the top end of the connecting part (310).

5. The rotary plug valve according to claim 4, wherein Further comprising a support pad (7), the driving piece (4) is provided with a limiting protrusion (450) used for abutting against the buffer pad (6), one end of the mounting hole (210) is provided with a boss part (220), one end of the support pad (7) abuts against the end surface of the limiting protrusion (450) away from the side end face of the mounting groove (440), and the other end of the support pad (7) can be used for abutting against the end surface of the boss part (220).

6. A rotary plug valve according to claim 5, wherein The driving piece (4) further comprises a connecting shaft part (420) and a hand wheel part (430), one end of the connecting shaft part (420) is connected with the lead screw part (410), and the other end is fixedly connected with the hand wheel part (430).

7. A rotary plug valve according to claim 6, wherein Further comprising a second sealing piece (460), a plurality of clamping grooves (421) are arranged on the wall surface of the connecting shaft part (420), the second sealing piece (460) is installed in the clamping grooves (421), and the second sealing piece (460) abuts against the wall surface of the mounting hole (210).

8. The rotary plug valve according to claim 1, wherein The connecting part (310) is provided with a threaded section (311), and the lead screw part (410) is threadedly connected with the threaded section (311).

9. The rotary plug valve according to claim 1, wherein Further comprising an insert (8) and a third sealing piece (810), the valve cover (2) and the exchange cavity (120) are fixedly connected through the insert (8), and the valve cover (2) and the insert (8) are sealed through the third sealing piece (810).

10. The rotary plug valve according to claim 9, wherein The materials of the insert (8), the valve cover (2), the valve core (3) and the lead screw part (410) are all stainless steel.

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