CN121408303A - A high-pressure shut-off check valve - Google Patents

Abstract

The invention relates to the technical field of high-pressure valves of ship pipeline systems and discloses a high-pressure stop check valve which comprises a valve body, wherein an external adjustable mechanism is arranged at least one connecting port of the valve body, the external adjustable mechanism comprises a bearing seat fixed at the outer side of the port of the valve body, an adjusting sleeve rotatably supported in the bearing seat, and a movable connecting piece matched with the adjusting sleeve through screw thread transmission, wherein the rotating adjusting sleeve can drive the movable connecting piece to move along the axial direction of the valve body so as to change the axial installation size of the connecting port.

Description

High-pressure stop check valve

Technical Field

The invention relates to the technical field of high-pressure valves of ship pipeline systems, in particular to a high-pressure stop check valve.

Background

The stop check valve is a valve with the functions of stopping and starting two-way circulation and check on a medium in a system pipeline, and the conventional ship pipeline hydraulic system stop check valve is low in application pressure level, small in structural size and small in starting moment, and can meet the manual starting requirement.

The invention discloses a marine external high-pressure stop check valve, which comprises a driving mechanism for controlling and dredging medium blocking and dredging, a stop mechanism for controlling and dredging medium, a flow control mechanism for controlling and controlling the flow of the introduced medium, and a flow control mechanism arranged in the stop mechanism, wherein the driving mechanism comprises a flange, a support frame body is fixedly arranged at the top of the flange, the marine external high-pressure stop check valve is in a collinear relation with the diagonal line of a diamond-shaped disc through a curved surface part at the bottom of a bottom bending handle, and the rest parts at the bottom end of the bottom bending handle are all vertical surfaces.

The conventional high-pressure cut-off check valve exposes significant technical drawbacks in terms of installation adaptability:

The valve body of the existing valve is of an integral casting or forging structure, and the distance between the connecting flanges is determined when leaving a factory. However, in actual engineering installation, due to early design errors, pipe prefabrication deviation, equipment foundation settlement or space layout limitation and the like, the flange butt joint surfaces at two ends of the pipeline often have size dislocation. In order to adapt to a valve with a fixed size, an installer often needs to compensate by adding or cutting a pipe section, using an eccentric reducing pipe and other complex modes, which not only increases the material cost and prolongs the construction period, but also introduces additional leakage points and flow resistance and reduces the reliability of the system.

The on-site adjustment capability is lost, the current few valves with the adjustment function in the market are usually limited in the adjustment mode of fine-tuning valve rods or changing the thickness of gaskets, the adjustment range is extremely limited (usually only a few millimeters), and the operation is complicated. For the conditions that the connection stress is generated in long-term operation caused by heat expansion and cold contraction and vibration impact or the connection size is required to be changed in later system transformation, the traditional valve cannot be adapted at all and can only be replaced integrally, so that resource waste and production stopping loss are caused.

Disclosure of Invention

The present invention is directed to a high-pressure stop check valve to solve the above-mentioned problems of the related art.

In order to achieve the above purpose, the present invention provides the following technical solutions:

The utility model provides a high-pressure stop check valve, includes valve body, valve disc, spring, lower valve rod, apron, valve gap, upper valve rod and indicator, the lower valve rod with upper valve rod passes through U type groove and links to each other, the valve disc is installed in lower valve rod bottom, the spring is installed between valve disc and lower valve rod, the apron is installed at lower valve rod head, installs in the valve body with the lower valve rod together, the valve gap is screwed with the upper valve rod, installs through the screw thread with the valve body, the indicator is laid on the upper valve rod, overlaps on the valve gap, upper valve rod top outside fixed mounting has the hand wheel, at least one connecting port department of valve body is equipped with outside adjustable adaptation mechanism;

the externally adjustable fitting mechanism includes:

A bearing seat fixed on the outer side of the valve body port;

An adjustment sleeve rotatably supported within the bearing housing;

The movable connecting piece is in threaded transmission fit with the adjusting sleeve;

The movable connecting piece can be driven to move along the axial direction of the valve body by rotating the adjusting sleeve so as to change the axial installation size of the connecting port.

Further, the valve body, the lower valve rod and the cover plate form a balance cavity structure.

Further, the sealing part between the valve disc and the valve body is a spherical surface, the sealing type is not limited to a spherical surface, and a conical surface or a plane can be applied as required.

Further, the valve disc and the lower valve rod are provided with diversion structures, wherein the lower valve rod is provided with diversion holes, the diversion holes are symmetrically arranged, and the shape, the number and the size of the diversion holes are determined according to the flow medium requirement of the high-pressure stop check valve.

Further, the inner wall of the adjusting sleeve is provided with external threads, and the outer surface of the movable connecting piece is provided with internal threads matched with the external threads of the adjusting sleeve.

Further, a guide key is fixedly arranged on the outer side of the side face of the valve body, a key groove is formed in the inner side of the movable connecting piece, and the guide key is in sliding connection with the key groove.

Further, a fixing hole is formed in the movable connecting piece, a plurality of limiting holes are formed in the adjusting sleeve, and the fixing hole is matched with the limiting holes.

Further, the inside of valve body is provided with seal assembly, seal assembly includes first sealing washer, second sealing washer, third sealing washer and fourth sealing washer, first sealing washer inlays to be established the valve body with the apron junction, the second sealing washer inlays to be established the apron with lower valve rod junction, the third sealing washer inlays to be established the valve body with lower valve rod junction, the fourth sealing washer inlays to be established lower valve rod with the valve disc junction.

Further, a placing groove is formed in the outer side of the side face of the valve body, and a fifth sealing ring is embedded in the placing groove.

Further, the first sealing ring, the second sealing ring, the third sealing ring, the fourth sealing ring and the fifth sealing ring are made of fluororubber, ethylene propylene diene monomer rubber or polyether-ether-ketone.

The beneficial effects of the invention are as follows:

1. According to the invention, the external adjustable adapting mechanism is arranged at least one connecting port of the valve body, the movable connecting piece can be driven to move along the axial direction of the valve body by rotating the adjusting sleeve, the axial installation size of the connecting port is flexibly changed, and different installation interval requirements in narrow spaces such as a ship cabin and a deck interlayer can be accurately adapted without additional cutting or adjusting pipelines. Meanwhile, the sliding fit of the guide key and the key groove ensures that the movable connecting piece does not deviate circumferentially in the moving process, the fixed hole and the limit hole can be reliably positioned after adjustment through the adaptive design, the installation stability is further improved, and the problems that the traditional valve is poor in installation flexibility and difficult to adapt to the trend pain point of a complex pipeline of a ship are solved.

2. The balance cavity structure formed by the valve body, the lower valve rod and the cover plate can introduce medium back pressure to offset forward acting force of a pipeline medium acting on the valve disc, so that the operating moment when the valve is opened and closed is fundamentally reduced, and the balance cavity structure can be matched with a hand wheel at the top of the upper valve rod, so that easy manual operation can be realized even under a high-pressure working condition, no additional power assistance is needed, and the actual requirements of manual operation and maintenance of a ship on site are met.

3. The valve disc and the valve body adopt a spherical sealing main flow design, so that impact force of a high-pressure medium can be effectively dispersed, erosion loss of a sealing pair is reduced, the high-pressure tolerance level of the valve is greatly improved, and meanwhile, the sealing type can be flexibly adapted to conical surfaces or planes, and the use requirements of different pressure levels are met. According to the design of the multi-position sealing assembly, the first to fourth sealing rings are used for sealing key joints of the valve body and the cover plate, the valve rod and the cover plate, the valve body and the valve rod and the valve disc respectively, the fifth sealing ring is used for strengthening the sealing effect of the connecting port, and the sealing rings can be made of fluororubber, ethylene propylene diene monomer rubber or polyether ether ketone and other corrosion-resistant and wear-resistant materials, so that multiple sealing protection under high-pressure working conditions is realized, medium leakage is effectively avoided, and the sealing rings are suitable for high-pressure multi-medium (fuel oil, seawater and the like) use scenes of a ship hydraulic system.

4. The invention has the advantages that the flow guide structure of the valve disc and the lower valve rod, in particular to the symmetrically arranged flow guide holes, greatly reduces the internal volume of the valve cavity on the premise of ensuring stable operation moment and circulation efficiency, ensures that the whole structure of the valve is more compact and lighter, perfectly adapts to the rigid constraint of limited ship installation space, and simultaneously, the shape, the number and the size of the flow guide holes can be customized according to the requirement of circulating media, thereby taking the suitability of different ship pipeline media into account and improving the universality of products.

5. The screw thread transmission structure of the external adjustable adapting mechanism is simple in design, convenient to adjust and position, convenient to operate, capable of reducing operation and maintenance costs of installation and subsequent pipeline adjustment, capable of improving corrosion resistance and wear resistance by matching multiple sealing arrangements with multiple sealing rings made of selectable materials, capable of prolonging service life of sealing parts, capable of flexibly selecting according to specific medium environments of ships and reducing replacement frequency of spare parts, high in integral structure modularization degree, reliable in key part connection, free of integral valve disassembly during subsequent overhaul, and further capable of reducing operation and maintenance difficulty and cost of the ships during long voyage.

Drawings

FIG. 1 is a schematic illustration of the overall structure of the present invention;

FIG. 2 is an exploded view of the overall structure of the present invention;

FIG. 3 is a schematic cross-sectional view of the overall structure of the present invention;

FIG. 4 is an enlarged view of the invention at A in FIG. 3;

fig. 5 is an enlarged view of the present invention at B in fig. 3.

Reference numeral 1, valve body; 2, valve disc, 3, spring, 4, lower valve rod, 5, cover plate, 6, valve cover, 7, upper valve rod, 8, indicator, 9, hand wheel, 10, bearing seat, 11, adjusting sleeve, 12, movable connecting piece, 13, guide key, 14, key slot, 15, fixed hole, 16, limit hole, 17, sealing component, 1701, first sealing ring, 1702, second sealing ring, 1703, third sealing ring, 1704, fourth sealing ring, 1705, placing groove, 1706 and fifth sealing ring.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the foregoing description of the invention, it should be noted that the azimuth or positional relationship indicated by the terms "one side", "the other side", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "identical" and the like do not denote that the components are identical, but rather that there may be minor differences. The term "perpendicular" merely means that the positional relationship between the components is more perpendicular than "parallel" and does not mean that the structure must be perfectly perpendicular, but may be slightly tilted.

FIGS. 1-5 illustrate a preferred embodiment of the present invention, and the present invention is further described below with reference to FIGS. 1-5.

A high-pressure stop check valve comprises a valve body 1, a valve disc 2, a spring 3, a lower valve rod 4, a cover plate 5, a valve cover 6, an upper valve rod 7 and an indicator 8, and is characterized in that the lower valve rod 4 and the upper valve rod 7 are connected through a U-shaped groove, a valve disc 2 is installed at the bottom of the lower valve rod 4, the spring 3 is installed between the valve disc 2 and the lower valve rod 4, the cover plate 5 is installed at the head of the lower valve rod 4 and installed inside the valve body 1 together with the lower valve rod 4, the valve cover 6 and the upper valve rod 7 are screwed together, the indicator 8 is installed on the upper valve rod 7 and sleeved on the valve cover 6, a hand wheel 9 is fixedly installed at the outer side of the top of the upper valve rod 7, an external adjustable mechanism is arranged at least one connecting port of the valve body 1, the external adjustable mechanism comprises a bearing seat 10 fixed at the outer side of the port of the valve body 1, an adjustable sleeve 11 rotatably supported in the bearing seat 10, a movable connecting piece 12 matched with the adjustable sleeve 11 through a screw transmission, the movable connecting piece 12 can be driven to move along the axial direction of the valve body 1, the movable connecting piece 12 can be driven to change the axial installation dimension of the connecting port, the connecting piece can be flexibly connected with a ship deck through the movable connecting piece through threads, and the movable connecting piece can be driven to be flexibly installed in the axial direction, and the clearance is not required to be changed, and the required to be flexibly or be flexibly adjusted.

The valve body 1, the lower valve rod 4 and the cover plate 5 form a balance cavity structure, and specifically, the balance cavity structure can introduce medium back pressure to offset forward acting force of a pipeline medium acting on the valve disc 2, so that operating moment of opening and closing the valve is obviously reduced, easy manual operation under a high-pressure working condition is realized, meanwhile, the pressure on two sides of the lower valve rod 4 can be balanced, the high-pressure sealing reliability is further improved by matching with the sealing assembly 17, and the service life of the valve is prolonged.

The sealing part of the valve disc 2 and the valve body 1 is spherical, the sealing type is not limited to a spherical surface, a conical surface or a plane can be applied according to the requirement, and particularly, the spherical sealing can effectively disperse the impact force of a high-pressure medium, so that the high-pressure tolerance capability and the sealing stability of a valve are greatly improved, the sealing type is flexibly adapted according to the actual pressure grade, the medium characteristic and the working condition requirement, the application scene coverage range of the product is widened, and the adaptation cost of different ship pipeline systems is reduced.

The valve disc 2 and the lower valve rod 4 are provided with diversion structures, wherein the lower valve rod 4 is provided with diversion holes, the diversion holes are symmetrically arranged, the shape, the number and the size of the diversion holes are determined according to the flow medium requirement of the high-pressure stop check valve, specifically, the symmetrically arranged diversion holes can optimize the medium flow path, the internal volume of the valve cavity is effectively reduced while the flow efficiency is ensured, the power-assisted valve is miniaturized and light, the requirement of being perfectly adapted to the limited ship installation space is met, and the shape, the number and the size of the diversion holes can be flexibly customized according to the flow medium characteristics, so that the suitability and the operation moment stability under different medium working conditions are ensured, and the universality and the application range of products are improved.

The inner wall of the adjusting sleeve 11 is provided with external threads, the outer surface of the movable connecting piece 12 is provided with internal threads matched with the external threads of the adjusting sleeve 11, and specifically, the threads are matched in a threaded matching way, so that the movable connecting piece 12 can be stably driven to move along the axis by rotating the adjusting sleeve 11, the fine adjustment of the axial installation size of the connecting port is realized, the operation is convenient and rapid, the adjusting precision is high, meanwhile, the threaded structure has a self-locking characteristic, the stable positioning can be kept after adjustment, the installation position deviation caused by ship navigation vibration is avoided, and the connection reliability and the sealing effect are ensured.

The outside fixed mounting of valve body 1 side has guide key 13, the keyway 14 has been seted up to the inboard of swing joint spare 12, guide key 13 and keyway 14 sliding connection, concretely, guide key 13 and the sliding fit of keyway 14 can accurately restrict the circumference rotation of swing joint spare 12, ensure that it only moves steadily along valve body 1 axis direction, avoid skew, the jamming to appear in the adjustment process, promote the accuracy and the smoothness nature of installation size adjustment, simultaneously this structure can share the radial atress of screw drive, reduce the screw wear, cooperation boats and ships vibration environment in navigation, further strengthen connection stability and part life, ensure the valve and reliably move for a long time.

The movable connecting piece 12 is internally provided with a fixed hole 15, the adjusting sleeve 11 is internally provided with a plurality of limiting holes 16, the fixed hole 15 is matched with the limiting holes 16, specifically, the fixed hole 15 is matched with the limiting holes 16, the movable connecting piece 12 can be locked by a bolt and other parts after being adjusted to a target position, the accurate positioning of the installation size is realized, the position deviation caused by ship navigation vibration is avoided, meanwhile, the arrangement of a plurality of groups of limiting holes 16 provides multi-gear adjusting selection, different installation interval requirements are matched, the operation is flexible, the locking structure is stable, and the reliability of the connection of the valve and the pipeline is further ensured.

The valve body 1 is internally provided with a sealing assembly 17, the sealing assembly 17 comprises a first sealing ring 1701, a second sealing ring 1702, a third sealing ring 1703 and a fourth sealing ring 1704, the first sealing ring 1701 is embedded at the joint of the valve body 1 and the cover plate 5, the second sealing ring 1702 is embedded at the joint of the cover plate 5 and the lower valve rod 4, the third sealing ring 1703 is embedded at the joint of the valve body 1 and the lower valve rod 4, the fourth sealing ring 1704 is embedded at the joint of the lower valve rod 4 and the valve disc 2, the outer side of the side surface of the valve body 1 is provided with a placing groove 1705, the fifth sealing ring 1706 is embedded in the placing groove 1705, the materials of the first sealing ring 1701, the second sealing ring 1702, the third sealing ring 1703, the fourth sealing ring 1704 and the fifth sealing ring 1706 are fluororubber, ethylene propylene diene monomer rubber or polyether ether ketone, specifically, the multiple-sealing rings accurately arranged at multiple positions form omnibearing sealing protection, the valve body 1 and parts and ports are covered on the whole, the joint of the valve body and the parts and ports are combined with key leakage risk points such as fluororubber, the polyether ether ketone and other wear-resistant materials are selected, reliable sealing under high-pressure working conditions are realized, the leakage is effectively, the medium is matched, the design, the cost is improved, the ship is the whole sealing valve has the service life and the service life is prolonged, and the life is prolonged.

The working principle and the using flow of the invention are as follows:

1. Principle of operation

The high-pressure stop check valve integrates three core functions of stop, check and size self-adaptive regulation, and the working principle is as follows:

Principle of cut-off and check function:

In the closing state (stop and backflow prevention), when the hand wheel 9 drives the upper valve rod 7 to rotate, the U-shaped groove drives the lower valve rod 4 and the valve disc 2 to move downwards, and the valve disc 2 is tightly pressed with the sealing surface (such as a spherical surface) of the valve body 1 to cut off the medium flow. At this time, if the outlet end pressure is higher than the inlet end, the reverse medium pressure acts together with the spring force to ensure the valve disc 2 to be tightly closed, and reliable non-return (backflow prevention) is realized.

In the open position, the hand wheel 9 is rotated reversely, the valve disc 2 moves upwards away from the sealing surface, and the medium can flow from the inlet end to the outlet end. The balance cavity structure plays a key role in the process, namely, high-pressure medium enters a balance cavity formed by the valve body 1, the lower valve rod 4 and the cover plate 5 through the diversion hole, an upward back pressure is generated on the lower valve rod 4, and the upward back pressure is mostly counteracted with downward thrust of the medium acting on the valve disc 2, so that the opening moment is greatly reduced, and easy manual operation under high pressure is realized.

Size self-adaptive regulation function principle:

the adjusting mechanism is that an adjusting sleeve 11 is fixed on the outer side of the port of the valve body 1 through rotation. Since the adjustment sleeve 11 is restrained against axial movement but free to rotate by the bearing housing 10, its internal threads drive the movable coupling member 12 (e.g., a movable flange) engaged therewith in axial movement. The cooperation of the guide key 13 with the key slot 14 ensures that the movable connector 12 only moves linearly and does not rotate.

And the locking mechanism is used for aligning the fixed hole 15 on the movable connecting piece 12 with the corresponding limit hole 16 on the adjusting sleeve 11 after the movable connecting piece is adjusted to the required length, and can realize mechanical locking by inserting a bolt or a set screw so as to prevent position change caused by vibration.

The seal guarantees that a fifth seal ring 1706 is arranged between the movable connecting piece 12 and the end face of the valve body 1, ensures the static seal reliability of the newly added interface after size adjustment, and forms a complete seal barrier together with the original multiple seal system in the valve.

2. Use flow

The valve is used in two main stages of installation size adjustment and conventional opening and closing operation.

First stage, size Pre-adjustment before installation

And measuring and calculating, namely measuring the actual distance between the pipeline flanges at the target installation position, comparing the actual distance with the factory default length of the valve, and calculating the required adjustment quantity.

Unlocking, namely if the limiting bolt is arranged, pulling out the limiting bolt.

Adjustment operation: manual rotation of the adjustment sleeve 11. Observing the movement of the articulating member 12, precise positioning can be achieved by graduations on the sleeve or direct measurement. The guide key 13 ensures a smooth and unbiased adjustment process.

And locking, namely aligning the fixed hole 15 with the limit hole 16 after the movable connecting piece 12 moves to the target position, inserting a bolt or tightening a set screw, and thus locking is completed.

And (3) installing, namely aligning the adjustable movable connecting piece 12 with the two ends (or one end) of the valve with the pipeline flange, and fastening the movable connecting piece with bolts. The fifth seal 1706 ensures a seal at this connection.

Second stage, opening and closing operation after being put into use

The valve is opened, a hand wheel 9 is rotated anticlockwise (usually provided), and the upper valve rod 7, the lower valve rod 4 and the valve disc 2 are driven to move upwards against the pretightening force of the spring 3. The back pressure created by the balancing chamber significantly reduces the rotational moment until the valve is fully open, the indicator 8 clearly shows the "on" position.

And the valve is closed, the hand wheel 9 is rotated clockwise, the valve disc 2 moves downwards under the assistance of the spring 3, and finally, the valve disc is attached to the sealing surface of the valve seat, so that the stop is realized. During closing, the reverse media pressure will enhance the sealing effect.

And the check function is that in the valve opening state, if the pressure at the outlet end is abnormally higher than that at the inlet end, the medium reverse force and the spring force automatically push the valve disc 2 to be closed, so that the medium is prevented from flowing backwards, and manual intervention is not needed.

Maintenance prompts periodically pass through the viewing window (if any) or check the status of the indicator 8 and notice if there is a leak outside the valve. Thanks to the multiple sealing design and the corrosion resistant material, the valve has a long maintenance period under normal working conditions. When the seal assembly 17 has reached its useful life, it can be replaced as designed.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The utility model provides a high-pressure stop check valve, includes valve body (1), valve disc (2), spring (3), lower valve rod (4), apron (5), valve gap (6), upper valve rod (7) and indicator (8), its characterized in that, lower valve rod (4) with upper valve rod (7) are connected through the U type groove, valve disc (2) are installed in lower valve rod (4) bottom, spring (3) are installed between valve disc (2) and lower valve rod (4), apron (5) are installed at lower valve rod (4) head, install in valve body (1) inside with lower valve rod (4), valve gap (6) and upper valve rod (7) are revolved and are installed through the screw thread with valve body (1), indicator (8) are laid on upper valve rod (7), overlap on valve gap (6), upper valve rod (7) top outside fixed mounting has hand wheel (9), at least one connection port department of valve body (1) is equipped with outside adjustable mechanism;

the externally adjustable fitting mechanism includes:

a bearing seat (10) fixed at the outer side of the port of the valve body (1);

an adjustment sleeve (11) rotatably supported in the bearing housing (10);

a movable connecting piece (12) which is matched with the adjusting sleeve (11) through screw thread transmission;

Wherein, rotating the adjusting sleeve (11) can drive the movable connecting piece (12) to move along the axial direction of the valve body (1) so as to change the axial installation size of the connecting port.

2. A high-pressure stop check valve according to claim 1, characterized in that the valve body (1), the lower valve rod (4) and the cover plate (5) form a balanced cavity structure.

3. A high pressure stop check valve according to claim 1, wherein the sealing part between the valve disc (2) and the valve body (1) is a spherical surface, the sealing type is not limited to a spherical surface, and a conical surface or a plane surface can be applied as required.

4. The high-pressure stop check valve according to claim 1, wherein the valve disc (2) and the lower valve rod (4) are provided with diversion structures, the lower valve rod (4) is provided with diversion holes, the diversion holes are symmetrically arranged, and the shape, the number and the size of the diversion holes are determined according to the flow medium requirement of the high-pressure stop check valve.

5. The high-pressure stop check valve according to claim 1, wherein the inner wall of the adjusting sleeve (11) is provided with external threads, and the outer surface of the movable connecting piece (12) is provided with internal threads which are matched with the external threads of the adjusting sleeve (11).

6. The high-pressure stop check valve according to claim 1, wherein a guide key (13) is fixedly arranged on the outer side of the side face of the valve body (1), a key groove (14) is formed in the inner side of the movable connecting piece (12), and the guide key (13) is in sliding connection with the key groove (14).

7. The high-pressure stop check valve according to claim 1, wherein a fixing hole (15) is formed in the movable connecting piece (12), a plurality of limiting holes (16) are formed in the adjusting sleeve (11), and the fixing hole (15) is matched with the limiting holes (16).

8. The high-pressure stop check valve according to claim 1, wherein a sealing assembly (17) is arranged in the valve body (1), the sealing assembly (17) comprises a first sealing ring (1701), a second sealing ring (1702), a third sealing ring (1703) and a fourth sealing ring (1704), the first sealing ring (1701) is embedded at the joint of the valve body (1) and the cover plate (5), the second sealing ring (1702) is embedded at the joint of the cover plate (5) and the lower valve rod (4), the third sealing ring (1703) is embedded at the joint of the valve body (1) and the lower valve rod (4), and the fourth sealing ring (1704) is embedded at the joint of the lower valve rod (4) and the valve disc (2).

9. The high-pressure stop check valve according to claim 8, wherein a placing groove (1705) is formed in the outer side of the side face of the valve body (1), and a fifth sealing ring (1706) is embedded in the placing groove (1705).

10. The high-pressure stop check valve according to claim 9, wherein the first sealing ring (1701), the second sealing ring (1702), the third sealing ring (1703), the fourth sealing ring (1704) and the fifth sealing ring (1706) are made of fluororubber, ethylene propylene diene monomer rubber or polyether ether ketone.