Stop check valve

Abstract

The stop check valve comprises a valve body, an elastic buffering assembly, a control assembly and a valve disc, a valve base is arranged in the valve body, the valve base and the opening end of the valve body are arranged in a face-to-face mode, the control assembly is connected with the peripheral side of the opening end of the valve body, the control assembly comprises an adjusting component and a valve rod, and the adjusting component is connected with the valve rod. The adjusting component drives the valve rod to move in the axial direction of the valve rod till the valve disc makes close contact with the valve base, so that liquid is prevented from flowing in the opposite direction, buffering thrust is exerted on the valve disc, and the valve disc can be slowly buckled to the valve base. The elastic buffering assembly can stretch out and draw back in the axial direction, has the pushing effect on the valve disc and can achieve the damping effect, the volume when the valve disc falls back to the valve base is reduced, leakage caused by damage of the sealing face between the valve disc and the valve base is avoided, and the service life of the stop check valve is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of check valves, and particularly relates to a stop check valve. Background Art

[0002] In the existing stop check valve, during check, the valve disc directly contacts the valve base without buffering. When the pressure is high, there is no buffering when the valve disc returns to the seat, resulting in excessive noise, and it is easy to damage the sealing surface, causing the check valve parts to leak easily and have a short service life. Summary of the Invention

[0003] An embodiment of the present invention provides a stop check valve, which reduces the volume when the valve disc falls back to the valve base, avoids leakage caused by damage to the sealing surface between the valve disc and the valve base, and improves the service life of the check valve.

[0004] The present invention provides a stop check valve, comprising: a cylindrical body, the cylindrical body includes an open end and an inlet end arranged oppositely in its own axial direction, an outlet end is further arranged on the side wall of the cylindrical body, the outlet end is communicated with the inside of the cylindrical body, a valve base is arranged at a position inside the cylindrical body close to the inlet end; an elastic buffer assembly, arranged on the valve base; a control assembly, connected to the valve body, including a telescopic valve rod and an adjusting member, the adjusting member is connected to the valve body along the circumferential side of the open end, and the telescopic valve rod penetrates through the adjusting member and extends into the inside of the cylindrical body; a valve disc, located inside the cylindrical body, facing the elastic buffer assembly and connected to the telescopic valve rod, and applying a driving force to the valve base.

[0005] In some optional embodiments, the central axis of the valve body forming the open end coincides with the central axis of the valve body forming the valve base, and the central axis of the valve body forming the inlet end coincides with or is perpendicular to the central axis of the valve body forming the outlet end.

[0006] In some optional embodiments, the valve base is provided with a flow hole and a limit hole, the elastic buffer assembly is arranged in the limit hole, and the elastic buffer assembly is connected to the support plate through a bolt assembly.

[0007] In some optional embodiments, the elastic buffer assembly includes a buffer cylinder, a limit plate, a buffer piston and a filtering member, two axially opposite ends of the buffer cylinder are respectively connected to the filtering member and the limit plate, the buffer cylinder is arranged in the limit hole, the limit plate is attached to the valve base, the limit plate and the valve base are detachably connected, one end of the buffer piston is inside the buffer cylinder, and the other end of the buffer piston abuts against the pressing cover plate.

[0008] In some alternative embodiments, a flow guiding member is disposed inside the buffer cylinder. The flow guiding member is disposed between the filtering member and the limiting plate, and the peripheral side of the flow guiding member is connected to the inner surface of the buffer cylinder.

[0009] In some alternative embodiments, the buffer piston includes a sliding block, the buffer plug and a buffer pad. One end of the sliding block is disposed inside the buffer cylinder. A fifth groove is formed at the end of the sliding block disposed inside the buffer cylinder. The buffer pad is disposed in the fifth groove. A fourth groove is formed at the other end of the sliding block. The buffer plug is disposed in the fourth groove. The buffer plug is in contact connection with the valve disc.

[0010] In some alternative embodiments, the filtering member is a filter screen. The filter screen is provided with a plurality of filter holes. The projected area of the plurality of filter holes in the axial direction of the valve base is smaller than the projected area of the buffer piston in the axial direction of the valve base.

[0011] In some alternative embodiments, the adjusting member is provided with a central hole. The inner surface of the adjusting member forming the central hole is provided with threads. The outer surface of the valve stem is provided with threads. The valve stem penetrates through the central hole. The valve stem is in threaded connection with the adjusting member.

[0012] In some alternative embodiments, the adjusting member includes an adjusting body, a flange and a sealing packing. The end of the adjusting body is connected to the flange. The flange is connected to the valve body along the peripheral side of the open end. The sealing packing is disposed in the central hole. The valve stem penetrates through the sealing packing.

[0013] In some alternative embodiments, a hand wheel is disposed at one end of the valve stem, and a valve disc is disposed at the other end of the valve stem.

[0014] The beneficial effects brought by the present invention are as follows:

[0015] As can be seen from the above solution, an embodiment of the present invention provides a stop check valve, which includes: a valve body, an elastic buffer assembly, a control assembly, and a valve disc. The valve body includes an open end, an inlet end, an outlet end, and a valve base. The inlet end of the valve body is connected to a liquid delivery pipeline, and the outlet end of the valve body is connected to a liquid delivery pipeline. Liquid flows in from the inlet end and flows out from the outlet end. The valve base is arranged inside the valve body, and the valve base and the open end are arranged face to face. The control assembly is connected to the periphery of the open end of the valve body. The control assembly includes an adjusting component and a valve rod. The adjusting component is connected to the valve rod, and the adjusting component drives the valve rod to move in the axial direction of the valve rod until the valve disc is in close contact with the valve base, thereby preventing the liquid from flowing from the outlet end towards the inlet end. There is a buffer thrust on the valve disc, so that the valve disc can slowly buckle onto the valve base. The elastic buffer assembly is arranged on the valve base. One end of the elastic buffer assembly is in contact with the valve disc. The elastic buffer assembly can expand and contract axially, has a pushing effect on the valve disc, can play a role in shock absorption, reduce the volume when the valve disc falls back to the valve base, avoid leakage caused by damage to the sealing surface between the valve disc and the valve base, and improve the service life of the stop check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a stop check valve provided by an embodiment of the present invention;

[0017] Figure 2 is a schematic structural diagram of the valve base provided by an embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of the elastic buffer assembly provided by an embodiment of the present invention.

[0019] In the figure, 1-valve body; 11-open end; 12-inlet end; 13-outlet end; 14-valve base; 141-flow through hole; 142-limit hole; 2-elastic buffer assembly; 21-buffer cylinder; 211-flow guiding component; 22-limit plate; 23-buffer piston; 231-sliding block; 232-buffer plug; 233-buffer pad; 24-filtering component; 3-control assembly; 31-valve rod; 311-hand wheel; 32-adjusting component; 321-adjusting body; 322-flange; 323-sealing packing; 4-valve disc. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] In the existing globe check valve, when checking, the valve disc directly contacts the valve base without buffering. When the pressure is high, there is too much noise when the valve disc returns to its seat without buffering, and it is easy to damage the sealing surface, resulting in easy leakage of the check valve parts and short service life.

[0022] An embodiment of the present invention provides a globe check valve, which reduces the volume when the valve disc 4 falls back to the valve base 14, avoids leakage caused by damage to the sealing surface between the valve disc 4 and the valve base 14, and improves the service life of the check valve.

[0023] The following will Figures 1 to 3 describe the globe check valve in detail with reference to the

[0024] The present invention provides a globe check valve, which includes: a valve body 1, including a cylindrical body, the cylindrical body includes an open end 11 and an inlet end 12 arranged oppositely in its own axial direction, and an outlet end 13 is also arranged on the side wall of the cylindrical body, the outlet end 13 is communicated with the inside of the cylindrical body, and a valve base 14 is arranged at a position close to the inlet end 12 inside the cylindrical body; an elastic buffer assembly 2, arranged on the valve base 14; a control assembly 3, connected to the valve body 1, including a telescopic valve rod 31 and an adjusting member 32, the adjusting member 32 is connected to the valve body 1 along the circumferential side of the open end 11, and the telescopic valve rod 31 penetrates through the adjusting member 32 and extends into the inside of the cylindrical body; a valve disc 4, located inside the cylindrical body, facing the elastic buffer assembly 2 and connected to the telescopic valve rod 31, applying a driving force to the valve base 14.

[0025] Specifically, the globe check valve includes a valve body 1, an elastic buffer assembly 2, a control assembly 3 and a valve disc 4. The valve body 1 includes an open end 11, an inlet end 12, an outlet end 13 and a valve base 14. The inlet end 12 of the valve body 1 is connected to a liquid conveying pipeline, and the outlet end 13 of the valve body 1 is connected to a liquid conveying pipeline. Liquid flows in from the inlet end 12 and flows out from the outlet end 13. The valve base 14 is arranged inside the valve body 1, and the valve base 14 and the open end 11 are arranged face to face. The control assembly 3 is connected to the circumferential side of the open end 11 of the valve body 1. The control assembly 3 includes an adjusting member 32 and a valve rod 31. The adjusting member 32 is connected to the valve rod 31, and the adjusting member 32 drives the valve rod 31 to move in its own axial direction. The end of the valve rod 31 is connected to the valve disc 4, so that the valve disc 4 and the valve base 14 are arranged face to face. The elastic buffer assembly 2 is arranged on the valve base 14. One end of the elastic buffer assembly 2 contacts the valve disc 4. The elastic buffer assembly 2 can expand and contract axially, and has a buffering thrust on the valve disc 4, so that the valve disc 4 can slowly snap onto the valve base 14. The elastic buffer assembly 2 can play a role in shock absorption, reduce the volume when the valve disc 4 falls back to the valve base 14, avoid leakage caused by damage to the sealing surface between the valve disc 4 and the valve base 14, and improve the service life of the globe check valve.

[0026] In some alternative embodiments, the central axis of the opening end 11 formed by the valve body 1 coincides with the central axis of the valve base 14 formed by the valve body 1, and the central axis of the inlet end 12 formed by the valve body 1 coincides with or is perpendicular to the central axis of the outlet end 13 formed by the valve body 1.

[0027] Specifically, as Figure 1 shown, the central axis of the opening end 11 formed by the valve body 1 coincides with the central axis of the valve base 14 formed by the valve body 1, the valve base 14 and the opening end 11 formed by the valve body 1 are arranged face to face, the central axis of the inlet end 12 formed by the valve body 1 coincides with the central axis of the outlet end 13 formed by the valve body 1, and the central axis of the inlet end 12 formed by the valve body 1 is perpendicular to the central axis of the opening end 11 formed by the valve body 1. As Figure 3 shown, the central axis of the opening end 11 formed by the valve body 1, the central axis of the valve base 14 formed by the valve body 1 and the central axis of the inlet end 12 formed by the valve body 1 coincide, the valve base 14 and the opening end 11 formed by the valve body 1 are arranged face to face, and the central axis of the inlet end 12 formed by the valve body 1 is perpendicular to the central axis of the outlet end 13 formed by the valve body 1.

[0028] In some alternative embodiments, the valve base 14 is provided with a flow hole 141 and a limit hole 142, the elastic buffer assembly 2 is arranged in the limit hole 142, and the elastic buffer assembly 2 is connected to the valve base 14 through a bolt assembly.

[0029] Specifically, the peripheral side of the valve base 14 is connected to the inner surface of the valve body 1. For the flow hole 141 of the valve base 14, liquid flows in from the inlet end 12 of the valve body 1, passes through the flow hole 141 of the valve base 14, and flows out from the outlet end 13 of the valve body 1. The liquid flows through the elastic buffer assembly 2. The elastic buffer assembly 2 can extend axially. The end of the elastic buffer assembly 2 contacts the valve disc 4. The valve rod 31 drives the valve disc 4 to move towards the valve base 14 until the valve disc 4 is in close contact with the valve base 14, thereby preventing the liquid from flowing from the outlet end 13 towards the inlet end 12. The elastic buffer assembly 2 has a certain resistance to the valve disc 4, enabling the valve disc 4 to slowly snap onto the end of the valve base 14, thus achieving a shock-absorbing effect, reducing the sound when the valve disc 4 returns to the valve disc 4 base 1, avoiding leakage caused by damage to the sealing surface between the valve disc 4 and the valve base 14, and improving the service life of the globe check valve.

[0030] In some alternative embodiments, the elastic buffer assembly 2 includes a buffer cylinder 21, a limit plate 22, a buffer piston 23 and a filtering component 24. The two axially opposite ends of the buffer cylinder 21 are respectively connected to the filtering component 24 and the limit plate 22. The buffer cylinder 21 is arranged in the limit hole 142 of the valve base 14. The limit plate 22 is in contact with the valve base 14, and the limit plate 22 and the valve base 14 are detachably connected. One end of the buffer piston 23 is inside the buffer cylinder 21, and the other end of the buffer piston 23 abuts against the valve disc 4.

[0031] Specifically, the limiting plate 22 fits against the valve base 14, and the limiting plate 22 and the valve base 14 are connected by a bolt assembly. The liquid flows through the buffer cylinder 21, and the liquid pushes the buffer piston 23 to move inside the buffer cylinder 21. The buffer piston 23 gradually drills out of the buffer cylinder 21. The valve stem 31 moves along the adjusting member 32, and the valve stem 31 drives the valve disc 4 to move towards the inside of the valve body until the valve disc 4 contacts the buffer piston 23. The buffer piston 23 has a certain pushing effect on the valve disc 4, so that the valve disc can slowly sit on the valve base 14, thus achieving the effect of shock absorption, reducing the volume when the valve disc 4 falls back to the valve base 14, avoiding leakage caused by damage to the sealing surface between the valve disc 4 and the valve base 14, and improving the service life of the globe check valve.

[0032] Further, the valve base 14 is provided with a groove, the limiting plate 22 is clamped in the groove, and a plurality of bolt assemblies are arranged on the periphery of the limiting plate 22. The bolt assemblies connect the limiting plate 22 and the valve base 14.

[0033] In some alternative embodiments, a flow guiding member 211 is arranged inside the buffer cylinder 21. The flow guiding member 211 is arranged between the filtering member 24 and the limiting plate 22, and the periphery of the flow guiding member 211 is connected to the inner surface of the buffer cylinder 21.

[0034] Specifically, the periphery of the flow guiding member 211 is connected to the inner surface of the buffer cylinder 21. The flow guiding member 211 divides the buffer cylinder 21 into a first chamber and a second chamber. One end of the buffer piston 23 is arranged in the first chamber. The flow guiding member 211 is provided with a through hole, and the through hole communicates the first chamber and the second chamber. A flow guiding member 211 is arranged inside the buffer cylinder 21. The flow guiding member 211 divides the buffer cylinder 21 into a first chamber and a second chamber. One end of the buffer piston 23 is arranged in the first chamber. The flow guiding member 211 is provided with a through hole, and the through hole communicates the first chamber and the second chamber. The liquid flows through the filtering member 24, the first chamber, the through hole and the second chamber. The liquid pushes the buffer piston 23, and the buffer piston 23 gradually drills out of the buffer cylinder 21. The buffer piston 23 abuts against the valve disc 4 and has a certain resistance to the valve disc 4, so that the valve disc 4 can slowly buckle on the end of the valve base 14, thus achieving the effect of shock absorption, reducing the volume when the valve disc 4 falls back to the valve base 14, avoiding leakage caused by damage to the sealing surface between the valve disc 4 and the valve base 14, and improving the service life of the globe check valve.

[0035] In some alternative embodiments, the buffer piston 23 includes a sliding block 231, a buffer plug 232 and a buffer pad 233. One end of the sliding block 231 is arranged inside the buffer cylinder 21. A fifth groove is arranged at the end of the sliding block 231 arranged inside the buffer cylinder 21. The buffer pad 233 is arranged in the fifth groove. A fourth groove is arranged at the other end of the sliding block 231. The buffer plug 232 is arranged in the fourth groove, and the buffer plug 232 is in contact connection with the valve disc 4.

[0036] Specifically, a flow guiding component 211 is arranged inside the buffer cylinder 21. The flow guiding component 211 divides the buffer cylinder 21 into a first chamber and a second chamber. One end of the buffer piston 23 is arranged in the first chamber. The flow guiding component 211 is provided with a through hole, and the through hole communicates the first chamber and the second chamber. The liquid flows through the filtering component 24, the first chamber, the through hole and the second chamber. The liquid pushes the sliding block 231, and the sliding block 231 gradually drills out of the buffer cylinder 21. The buffer plug 232 of the buffer piston 23 is in contact connection with the valve disc 4, avoiding the direct contact between the buffer plug 232 and the valve disc 4, thus causing a large pressure. During the process of the valve disc 4 falling back, it pushes the sliding block 231, and the buffer pad 233 of the buffer piston 23 contacts the inside of the buffer cylinder 21, avoiding the direct contact between the buffer piston 23 and the inside of the buffer cylinder 21, thus causing damage to the buffer cylinder 21. The buffer piston 23 pushes the valve disc 4, enabling the valve disc 4 to slowly buckle at the end of the valve base 14, thus playing a shock-absorbing effect, reducing the volume when the valve disc 4 falls back to the valve base 14, avoiding leakage caused by the damage of the sealing surface between the valve disc 4 and the valve base 14, and improving the service life of the stop check valve.

[0037] In some alternative embodiments, the filtering component 24 is a filter net, and the filter net is provided with a plurality of filtering holes. The projected area of the plurality of filtering holes in the axial direction of the valve base 14 is smaller than the projected area of the buffer piston 23 in the axial direction of the valve base 14.

[0038] Specifically, the filtering component 24 is a filter net, and the filter net is provided with a lot of filtering holes. The diameter of the filtering holes is smaller than the cross-sectional area of the buffer piston 23, so that the buffer piston 23 can move slowly. The buffer piston 23 gradually drills out of the buffer cylinder 21, and the buffer piston 23 thus pushes the valve disc 4 to rotate, enabling the valve disc 4 to buckle at the end of the valve base 14, thus preventing the liquid from passing through the valve base 14, making the valve disc 4 and the valve base 14 in sealed connection. The elastic buffer assembly 2 can play a shock-absorbing effect, reducing the volume when the valve disc 4 falls back to the valve base 14, avoiding leakage caused by the damage of the sealing surface between the valve disc 4 and the valve base 14, and improving the service life of the check valve.

[0039] In some alternative embodiments, the adjusting component 32 is provided with a central hole. The inner surface of the adjusting component 32 forming the central hole is provided with threads, and the outer surface of the valve rod 31 is provided with threads. The valve rod 31 penetrates through the central hole, and the valve rod 31 is in threaded connection with the adjusting component 32.

[0040] Specifically, the valve rod 31 is in threaded connection with the adjusting component 32, and the valve rod 31 rotates around the adjusting component 32, so that the valve rod 31 can move along the adjusting component 32. The valve rod 31 drives the valve disc 4 to move, so that the valve disc 4 fits with the valve base 14, thus preventing the liquid from moving from the outlet end 13 to the inlet end 12.

[0041] In some alternative embodiments, the adjusting member 32 includes an adjusting body 321, a flange 322, and a packing 323. The end of the adjusting body 321 is connected to the flange 322, the flange 322 is connected to the valve body 1 along the circumferential side of the open end 11, the packing 323 is disposed in the central hole, and the valve stem 31 passes through the packing 323.

[0042] Specifically, the adjusting member 32 is provided with a central hole. The inner surface of the adjusting member 32 that forms the central hole is provided with threads, and the outer surface of the valve stem 31 is provided with threads. The valve stem 31 passes through the central hole, and the valve stem 31 is threadedly connected to the adjusting member 32. The valve stem 31 rotates around the adjusting member 32, so that the valve stem 31 can move along the adjusting member 32. The valve stem 31 drives the valve disc 4 to move, so that the valve disc 4 fits against the valve base 14, thereby preventing the liquid from moving from the outlet end 13 to the inlet end 12. The adjusting member 32 includes an adjusting body 321, a flange 322, and a packing 323. The inner surface of the adjusting body 321 that forms the central hole is provided with threads, the valve stem 31 is threadedly connected to the adjusting body 321, the end of the adjusting body 321 is connected to the flange 322, the flange 322 is connected to the valve body 1 along the circumferential side of the open end 11 through a bolt assembly, the packing 323 is disposed in the central hole, the valve stem 31 passes through the packing 323, and the packing 323 fills the gap between the valve stem 31 and the central hole to prevent the liquid in the valve body 1 from flowing into the central hole.

[0043] In some alternative embodiments, a handwheel 311 is provided at one end of the valve stem 31, and a valve disc 4 is provided at the other end of the valve stem 31.

[0044] Specifically, by rotating the handwheel 311, the valve stem 31 rotates around the adjusting member 32, so that the valve stem 31 can move along the adjusting member 32. The valve stem 31 drives the valve disc 4 to move, so that the valve disc 4 fits against the valve base 14, thereby preventing the liquid from moving from the outlet end 13 to the inlet end 12.

[0045] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A stop check valve, characterized in that: include: The valve body (1) comprises a cylindrical body, wherein the cylindrical body comprises an opening end (11) and an inlet end (12) which are arranged opposite to each other in the axial direction thereof, and an outlet end (13) is also arranged on the side wall of the cylindrical body, wherein the outlet end (13) is communicated with the interior of the cylindrical body, and a valve seat (14) is arranged in the interior of the cylindrical body near the inlet end (12); An elastic buffer component (2) is arranged on the valve base (14); A control assembly (3) connected to the valve body (1), comprising a telescopic valve stem (31) and an adjusting component (32), wherein the adjusting component (32) is connected to the valve body (1) along the circumference of the opening end (11), and the telescopic valve stem (31) passes through the adjusting component (32) and extends to the interior of the cylindrical body; The valve disc (4) is located inside the cylindrical body, faces the elastic buffer assembly (2), is connected to the telescopic valve stem (31), and applies a driving force to the valve base (14).

2. The stop check valve according to claim 1, characterized in that: The center axis of the opening end (11) formed by the valve body (1) coincides with the center axis of the valve base (14) formed by the valve body (1), and the center axis of the inlet end (12) formed by the valve body (1) coincides with or is perpendicular to the center axis of the outlet end (13) formed by the valve body (1).

3. The stop check valve according to claim 2, characterized in that: The valve base (14) is provided with a flow hole (141) and a limit hole (142), the elastic buffer component (2) is provided in the limit hole (142), and the elastic buffer component (2) is connected to the valve base (14) via a bolt assembly.

4. The stop check valve according to claim 3, characterized in that: The elastic buffer assembly (2) comprises a buffer cylinder (21), a limit plate (22), a buffer piston (23) and a filter component (24); the two axially opposite ends of the buffer cylinder (21) are respectively connected to the filter component (24) and the limit plate (22); the buffer cylinder (21) is arranged in the limit hole (142); the limit plate (22) is in contact with the valve base (14); the limit plate (22) and the valve base (14) are detachably connected; one end of the buffer piston (23) is inside the buffer cylinder (21); and the other end of the buffer piston (23) is in contact with the valve disc (4).

5. The stop check valve according to claim 4, characterized in that: A flow guide component (211) is arranged inside the buffer cylinder (21); the flow guide component (211) is arranged between the filter component (24) and the limit plate (22); and the peripheral side of the flow guide component (211) is connected to the inner surface of the buffer cylinder (21).

6. The stop check valve according to claim 5, characterized in that: The buffer piston (23) includes a sliding block (231), a buffer plug (232) and a buffer pad (233), one end of the sliding block (231) is arranged inside the buffer cylinder (21), a fifth groove is arranged at the end of the sliding block (231) arranged inside the buffer cylinder (21), the buffer pad (233) is arranged in the fifth groove, the other end of the sliding block (231) is arranged in the fourth groove, and the buffer plug (232) is connected to the valve disc (4) in abutment with it.

7. The stop check valve according to claim 6, characterized in that: The filter component (24) is a filter screen, and the filter screen is provided with a plurality of filter holes, and the axial projection area of ​​the plurality of filter holes on the valve base (14) is smaller than the axial projection area of ​​the buffer piston (23) on the valve base (14).

8. The stop check valve according to claim 1, characterized in that: The adjusting component (32) is provided with a center hole, the inner surface of the adjusting component (32) forming the center hole is provided with a thread, the outer surface of the valve stem (31) is provided with a thread, the valve stem (31) passes through the center hole, and the valve stem (31) is threadedly connected to the adjusting component (32).

9. The stop check valve according to claim 8, characterized in that: The adjusting component (32) comprises an adjusting body (321), a flange (322) and a sealing packing (323); the end of the adjusting body (321) is connected to the flange (322); the flange (322) is connected to the valve body (1) along the circumference of the opening end (11); the sealing packing (323) is arranged in the center hole; and the valve stem (31) passes through the sealing packing (323).

10. The stop check valve according to claim 9, characterized in that: A hand wheel (311) is arranged at one end of the valve stem (31), and a valve disc (4) is arranged at the other end of the valve stem (31).

Images