CN221034138U - Low pressure loss anti-rotation pressure relief valve - Google Patents

Abstract

The utility model discloses a low-pressure-loss anti-rotation pressure relief valve, which comprises a valve body and a valve core, wherein the valve body comprises an inlet section, a mounting section and an outlet section, the inner diameter of the mounting section is larger than that of the inlet section and the outlet section, one end of the valve body is provided with a valve joint which is detachably connected, and one end of the valve joint, which is close to the valve body, is provided with a hollowed-out guide structure A; the valve core comprises a lower valve rod which is in sliding fit with the guide structure A and is supported on the guide structure A through a check spring, one end of the lower valve rod, which is far away from the valve joint, is provided with a plugging part, the plugging part is positioned in the installation section, and the outer diameter of the plugging part is larger than the inner diameter of the inlet section and smaller than the inner diameter of the installation section; the valve core is internally provided with a pressure relief channel, a pressure relief plug is arranged in the lower valve rod, and a pressure relief spring is arranged between the pressure relief plug and the lower valve rod. The valve has better non-return anti-rotation function, can effectively prevent burst damage caused by overhigh pressure at the weak part at the downstream of the valve, has better circulation capacity, and has lower pressure loss when water passes through.

Description

Low pressure loss anti-rotation pressure relief valve

Technical Field

The utility model belongs to the field of water meter metering equipment, and particularly relates to a low-pressure loss anti-rotation pressure release valve.

Background

The water meter is a common water metering tool, and the metering principle is based on the actual use amount of a user, so that the traditional water meter is usually matched with a check valve to be used, and mainly aims to prevent autorotation caused by water pressure fluctuation when water is not used, and ensure the metering accuracy. In the actual installation process, the check valve is often installed before the water gauge, can be full of residual water between check valve and the resident tap, if the pipeline section between check valve and the water gauge to and the pipe is exposed in open environment for a long time after the water gauge and, receive influence such as insolation, can directly influence the pressure behind the check valve, after water pressure exceeds a certain value, very big probably can cause water gauge glass lid bursting or other rear end weak position bursting.

In the prior art, the above-mentioned potential safety hazards are also noted, and thus products for solving the above-mentioned problems, such as the patent with the name of 202022634073.X, named as a check valve for preventing the water meter from rotating, are presented, mainly by means of opening a through hole in a check valve housing, the front and the rear of the valve are actually communicated, and the through hole of the cover is in a continuous communicating state, so that the pressure in the rear space of the check valve does not rise above the safety pressure basically. In addition, there is also a mode of directly radially opening a through hole on the shell of the valve, and plugging the valve by utilizing a disposable breaking structure, and after the pressure after the valve rises to a certain value, the plugging structure can be broken and decompressed.

To the above two schemes, the applicant found in the study that, although the pressure release can be realized by adopting the first internal communication mode, the anti-rotation effect is not ideal, the metering accuracy is directly reduced, and the second external communication pressure release mode, although having better anti-rotation effect, can lead to outflow of water in the pipe in the pressure release process, causes water loss, ponding or affects the environmental electricity safety and other problems, therefore, a structure capable of ensuring better anti-rotation effect and preventing the water meter from bursting is needed.

Disclosure of utility model

In view of the above, the utility model provides a low-pressure loss anti-rotation pressure release valve, which solves the problems that the check valve in the prior art has functional defects, can not better meet the anti-rotation and anti-burst requirements at the same time, and has larger pressure loss.

The technical scheme is as follows:

The utility model provides a low pressure loss prevents rotation relief valve, includes valve body and case, its key lies in: the valve body comprises an inlet section, a mounting section and an outlet section which are integrally formed, wherein the inner diameter of the mounting section is larger than that of the inlet section and the inner diameter of the outlet section, one end of the valve body is provided with a valve joint which is detachably connected, and one end, close to the valve body, of the valve joint is provided with a hollowed-out guide structure A;

The valve core comprises a lower valve rod, the lower valve rod is in sliding fit with the guide structure A and is supported on the guide structure A through a check spring, one end of the lower valve rod, which is far away from the valve joint, is provided with a disc-shaped blocking part, the blocking part is positioned in the installation section, and the outer diameter of the blocking part is larger than the inner diameter of the inlet section and smaller than the inner diameter of the installation section;

The valve core is characterized in that a pressure relief channel is arranged in the valve core, a pressure relief plug is arranged in the lower valve rod, a pressure relief spring is arranged between the pressure relief plug and the lower valve rod, in an initial state, the valve core is in a return stop state under the action of the check spring, the plug part is located at the end part of the inlet section and is separated from the space of the installation section, the pressure relief plug is used for blocking the pressure relief channel under the action of the pressure relief spring, when the pressure of the outlet section rises, and the pressure difference between the pressure relief plug and the inlet section is larger than the pre-pressure of the pressure relief spring, the pressure relief plug is separated from the blocking position, and the pressure of the outlet section is released to the inlet section through the pressure relief channel.

By adopting the scheme, on one hand, the normal condition is under the action of the check spring, the partition of the water supply main pipe network can be satisfied to play the effect of preventing the water meter from rotating, on the other hand, through setting up the pressure release channel and the pressure release blocking cooperation, when the pressure of the downstream pipe section or the water meter rises, after the pressure difference value of the pressure release channel and the upstream pressure exceeds the limit value, the pressure release channel can be used for releasing pressure, so that the condition that the pressure is too high to cause bursting of the weak part of the water meter or the downstream pipe section is prevented, and the pressure release is realized, other potential safety hazards caused by overflow of fluid are avoided, in addition, the inner diameter of the installation section can be designed to be larger within the allowable range, thus the water flow can more easily pass through the installation section, and the pressure loss can be relatively reduced.

As preferable: the valve core further comprises an upper valve rod fixedly connected with the lower valve rod, a pressure release cavity is arranged at the position, close to the end part, in the lower valve rod, and a lower section pressure release hole communicated with the pressure release cavity, an upper section pressure release hole axially arranged along the upper section pressure release hole is arranged in the upper valve rod, a guide structure B in a hollow structure is arranged in the inlet section, and the upper valve rod is in sliding fit with the guide structure B. By adopting the scheme, the centering degree of the valve core movement can be greatly improved by the two guide structures of the guide structure A and the guide structure B, deflection is prevented, and the plugging performance of the plugging part can be ensured to be better, namely the self-rotation preventing sealing performance is better.

As preferable: and a sealing ring is arranged at one end, far away from the valve joint, of the lower valve rod, and when the lower valve rod is in a return stop state, the sealing ring is abutted against a step surface between the inlet section and the mounting section. By adopting the scheme, the sealing performance is enhanced through the sealing ring, and the integral anti-rotation non-return effect is improved.

As preferable: the one end that goes up the valve rod and be close to the lower valve rod has the clamping part, the external diameter of clamping part is less than entry section internal diameter, the sealing ring is located between clamping part and the shutoff portion. By adopting the scheme, the stability of the sealing ring can be provided, the valve is prevented from falling off, and meanwhile, the moving stability of the valve core is further improved.

As preferable: the pressure release cavity is internally provided with an inner step surface, the upper valve rod is provided with an inner ring boss which extends into the pressure release cavity and abuts against the inner step surface, and the end surface of the lower valve rod is fixedly connected with the pressing part. By adopting the scheme, the installation centering degree of the upper valve rod and the lower valve rod can be well guaranteed, and eccentricity is avoided.

As preferable: the upper valve rod is provided with a convex column coaxially arranged with the pressure release cavity, and the pressure release spring is sleeved on the convex column;

The pressure relief plug comprises a plug part and a rod part which are fixed integrally, wherein the diameter of the rod part is smaller than that of the plug part, the pressure relief spring is positioned at the outer side of the rod part and is coaxially arranged with the convex column, and at least one pressure relief notch which is radially arranged along the end part of the convex column and/or ribs which are uniformly distributed are arranged at the end part of the rod part are arranged at the end part of the convex column. By adopting the scheme, even if the rod part is tightly attached to the end face of the convex column, the pressure relief holes at the upper end and the lower end can be communicated, namely, the pressure relief channel can be unobstructed, and the pressure relief can be normally carried out without being separated.

As preferable: the blocking part is provided with pressure relief guide grooves which are uniformly distributed along the circumferential direction of the blocking part, and the pressure relief guide grooves are axially arranged along the rod part. By adopting the scheme, the situation that the circumferential outer side of the blocking part is clung to the side wall of the pressure relief cavity due to thermal expansion can be avoided, namely, the pressure relief channel can be completely communicated when the pressure relief block is axially moved, and the pressure relief reliability is further improved.

As preferable: the inlet section end has an annular boss extending into the mounting section, the annular boss having an outer diameter less than an outer diameter of the seal ring. By adopting the scheme, when the valve core is in the stop state, the sealing ring is practically abutted against the end face of the protruding part, and under the action of the plugging part, the outer edge of the sealing ring has a tendency of bending towards the inlet section, so that the sealing performance is further improved.

As preferable: the valve body is in threaded fit with the valve joint, and an outer sealing ring is arranged between the valve body and the valve joint. By adopting the scheme, the sealing performance between the two is improved.

As preferable: the maximum outer diameter of the valve joint is smaller than the inner diameter of the mounting section, the valve joint is provided with a tensioning nut, the outer end of the valve joint is provided with an outer ring boss, and one end of the valve joint, which is far away from the valve body, is of an inner flat square hole structure. By adopting the scheme, the water meter tensioning nut and the valve are connected into a whole, so that the water meter tensioning nut is not easy to lose, the mounting accessories can be reduced, and the field mounting efficiency is improved.

Compared with the prior art, the utility model has the beneficial effects that:

The low-pressure loss anti-rotation pressure release valve is mainly used for an existing valve rod structure, so that the protective valve has a better non-return anti-rotation function, burst damage caused by overhigh pressure at a weak part at the downstream of the valve can be effectively prevented, the problem of rotation of a water meter is solved, negative effects caused by a conventional anti-rotation connecting pipe are eliminated, the inner diameter of an installation section in the structure can be maximized as much as possible, the good circulation capacity is achieved, and the pressure loss is lower when water passes through.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model (with the valve element in a stopped position);

FIG. 2 is a schematic view of the embodiment of FIG. 1 (with the valve cartridge at the supply level);

FIG. 3 is a schematic diagram of a valve core structure;

FIG. 4 is a side view of the valve body;

FIG. 5 is a cross-sectional view of the valve body;

FIG. 6 is a valve side view;

FIG. 7 is a cross-sectional view taken at A-A of FIG. 6;

FIG. 8 is a schematic view of the lower stem structure;

FIG. 9 is a cross-sectional view of FIG. 8;

FIG. 10 is a schematic view of the upper stem structure;

FIG. 11 is an isometric view of an upper stem;

FIG. 12 is a cross-sectional view of the upper stem;

FIG. 13 is a schematic diagram of a pressure relief plug;

FIG. 14 is a schematic view of a conventional anti-spin valve;

Fig. 15 is a schematic view showing the installation of a conventional anti-rotation valve.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

In order to facilitate understanding of the background technology and technical problems of the present utility model, referring first to fig. 14 and 15, a conventional anti-rotation valve mainly includes a connection pipe a, an inner sleeve D, a support F and a valve stem E, where, as shown in the drawing, the valve stem E is installed in the inner sleeve D by a check spring C and can seal the water inlet end of the inner sleeve D under the action of the check spring C, the end of the valve stem is provided with an arc-shaped abutment surface, the inner side of the inner sleeve D is provided with a sealing ring H, the sealing ring H is located between the inner sleeve D and the end of the support F, the contact part of the arc-shaped abutment surface and the sealing ring H is a sealing surface B, and the support F is welded in the inner sleeve D by ultrasonic waves and has a welding surface G.

When the water meter is usually installed and used, the water meter is installed at the front end of the water meter, the water meter can be directly connected to the end part of the water meter through a nut, a household pipeline and the like are arranged at the rear surface of the water meter, and as shown in the figure, the arc-shaped abutting surface is close to the pressure position P ₁ at one side of the main pipe network, and the P ₂ is arranged at the other side of the main pipe network.

The applicant found in the study that, in addition to the defect that the pressure release cannot be realized, namely, P ₂ can continuously rise under the condition that water is not used for a long time and the downstream is heated, and then the weak part bursts, the applicant also noted that because the welding position of the inner sleeve D and the support F is positioned in the deep part of the connecting pipe a, the welding quality is inconvenient to observe and evaluate rapidly, the sealing ring H is fixed with the support F by virtue of the inner sleeve D, and whether the sealing ring H has defects of offset, fold and the like which affect the tightness cannot be judged because the sealing ring H is positioned in the deep part of the inner hole, even if the problem is found, all materials, namely the production cost, cannot be completely lost because the sealing ring D cannot be completely taken out. In practical application, the water often falls off, so that the autorotation prevention effect is affected, the flow is blocked, the water yield is reduced, and the normal water use of households is affected.

And because the actual water passing area needs to be considered, the size of the sealing ring H is limited by the size design, the sealing ring H is thinner, the sealing effect is poor, namely, the sealing effect is poor, autorotation still occurs, and on the other hand, under the impact of water flow in actual use, the valve rod generates an acting force to the support with extremely large impact force, and the weld joint is possibly invalid, namely, the separation of the support F and the inner sleeve D occurs.

Referring to the low-pressure loss anti-rotation pressure release valve shown in fig. 1 to 13, the low-pressure loss anti-rotation pressure release valve mainly comprises a valve body 1 and a valve core arranged in the valve body 1, as shown in the figure, the valve body 1 is of a hollow tubular structure and comprises an inlet section 10, a mounting section 11 and an outlet section 12 which are integrally formed, wherein the inner diameter of the mounting section 11 is larger than that of the inlet section 10 and the inner diameter of the outlet section 12, one end of the valve body 1 is provided with a valve joint 8 which is connected in a detachable mode, and one end, close to the valve body 1, of the valve joint 8 is provided with a hollowed-out guide structure A80.

The valve core mainly comprises a lower valve rod 2, the lower valve rod 2 is of a stepped rod-shaped structure and is in sliding fit with a guide structure A80, the lower valve rod 2 is supported on the guide structure A80 through a check spring 4, one end of the lower valve rod 2, which is far away from a valve joint 8, is provided with a disc-shaped blocking part 21, the blocking part 21 is positioned in an installation section 11, the outer diameter of the blocking part is larger than the inner diameter of an inlet section 10 and smaller than the inner diameter of the installation section 11, as shown in the figure, the support guide structure A80 mainly comprises a guide part 800 which is coaxially arranged with the valve joint 8, the guide part 800 is provided with a through hole 802 matched with the lower valve rod 2, the guide part 800 is connected with the inner side of the valve joint 8 into a whole through a connecting part 801, and a larger gap for water supply flow passes through is reserved between the guide structure A80 and the inner side wall of the valve joint 8.

The valve core is internally provided with a pressure relief channel, the lower valve rod 2 is internally provided with a pressure relief plug 5, the pressure relief plug 5 is positioned in the pressure relief channel, a pressure relief spring 6 is arranged between the pressure relief plug 5 and the lower valve rod 2, in an initial state (i.e. in an unused state), the valve core is in a stop position under the action of the check spring 4, the plugging part 21 is positioned at the end part of the inlet section 10 and is separated from the space of the installation section 11, the pressure relief plug 5 blocks the pressure relief channel under the action of the pressure relief spring 6, namely, the pressure spaces at two sides of the plugging part 21 are separated, when the pressure of the outlet section 12 (i.e. the pressure at the right side of the plugging part 21) rises, and when the pressure difference between the pressure relief plug and the pressure in the inlet section 10 is larger than the precompression of the pressure relief spring 6, the pressure relief plug 5 is jacked to move towards the inlet section 10 and separated from the blocking position, and the pressure in the outlet section 12 can be released to the inlet section 10 through the pressure relief channel.

In order to further improve the centering performance of the valve core moving, the valve core further comprises an upper valve rod 3 fixedly connected with the lower valve rod 2, as shown in the figure, a pressure release cavity 23 is arranged at a position, close to the end part, in the lower valve rod 2, and a lower section pressure release hole 20 communicated with the pressure release cavity 23, a pressure release plug 5 is arranged in the pressure release cavity 23, an upper section pressure release hole 30 axially arranged in the upper valve rod 3 is arranged, a guide structure B13 in a hollow structure is arranged in the inlet section 10, the guide structure B13 is similar to the guide structure A80, details are omitted, the upper valve rod 3 is in sliding fit with the guide structure B13, and therefore the valve core is limited and guided by the guide structure A80 and the guide structure B13 in the moving process, and the centering degree of the plugging part 21 is greatly improved.

One end of the lower valve rod 2, which is far away from the valve joint 8, is provided with a sealing ring 7, when the valve core is in a return stop state, the sealing ring 7 is propped against a step surface between the inlet section 10 and the mounting section 11, one end of the upper valve rod 3, which is close to the lower valve rod 2, is provided with a compressing part 31, the outer diameter of the compressing part 31 is smaller than the inner diameter of the inlet section 10, the sealing ring 7 is positioned between the compressing part 31 and the plugging part 21, and it is noted that in the embodiment, the lower valve rod 2 is provided with a limiting step 25, the limiting step 25 is closer to the guiding structure A80 relative to the plugging part 21, and the outer diameter of the limiting step 25 is larger than the inner diameter of the through hole 802, as shown in fig. 2, and under the normal water supply condition, the limiting step 25 is propped against the guiding structure A80.

In order to ensure the smoothness of the sliding of the valve core, the friction between the valve rod and the corresponding guide structure is reduced, or the impurity blocks the micro gap between the valve rod and the guide structure, so that the lower valve rod 2 is provided with a drain groove A24 extending along the axial direction of the lower valve rod, and the upper valve rod 3 is provided with a drain groove B34 extending along the axial direction of the upper valve rod.

The pressure release cavity 23 is internally provided with an inner step surface 22, the upper valve rod 3 is provided with an inner ring boss 32 extending into the pressure release cavity 23, the end surface of the lower valve rod 2 is fixedly connected with the compressing part 31, and the two parts are directly fixed by adopting ultrasonic welding.

The upper valve rod 3 is provided with a convex column 33 coaxially arranged with the pressure release cavity 23, the pressure release spring 6 is sleeved on the convex column 33, the pressure release plug 5 comprises a plug part 50 and a rod part 51 which are integrally fixed, wherein the diameter of the rod part 51 is smaller than that of the plug part 50, the pressure release spring 6 is positioned outside the rod part 51 and coaxially arranged with the convex column 33, the end part of the convex column 33 is provided with at least one pressure release notch 330 radially arranged along the convex column, and/or the end part of the rod part 51 is provided with ribs which are uniformly distributed.

In the application, the blocking part 50 and the rod part 51 are integrally molded by silicon rubber with the Shore hardness of 80+/-5 HA, the blocking part 50 is provided with the pressure relief guide grooves 52 which are uniformly distributed along the circumferential direction, and the pressure relief guide grooves 52 are arranged along the axial direction of the rod part 51.

With particular reference to fig. 1, 2, 5 and 7, the end of the inlet section 10 has an annular boss 14 extending into the mounting section 11, the outer diameter of the annular boss 14 being smaller than the outer diameter of the sealing ring 7, and when the valve core is in the rest position, the sealing ring 7 is in close contact with the end face of the annular boss 14. The valve body 1 is in threaded fit with the valve joint 8, an outer sealing ring 9 is arranged between the valve body 1 and the valve joint 8, and a sealing ring groove 82 is arranged behind the threaded section on the valve joint 8 as shown in the figure, and the outer sealing ring 9 is positioned in the sealing ring groove 82.

The pressure release valve is also integrated with a tightening nut M, as shown in the figure, the maximum outer diameter of the valve joint 8 is smaller than the inner diameter of the mounting section 11, the valve joint 8 is provided with a male buckle at the screw buckle section, the valve body 1 is provided with a female buckle, the valve joint 8 is provided with an outer ring boss 81, the tightening nut M is directly sleeved on the valve joint 8 and is buckled with the outer ring boss 81, the tightening nut M is provided with a female buckle which is suitable for the inlet end of the water meter, and in addition, one end of the valve joint 8 far away from the valve body 1 is provided with an inner flat square hole structure, so that a flat square wrench can conveniently extend into the valve joint to be screwed.

Referring to the low pressure loss anti-rotation pressure release valve shown in fig. 1 to 13, the assembly process is as follows, firstly, a sealing ring 7 is sleeved on a lower valve rod 2, then a pressure release plug 5 and a pressure release spring 6 are sequentially arranged in a pressure release cavity 23, and then the lower valve rod 3 and an upper valve rod 2 are assembled and fixed through ultrasonic welding.

The assembled valve core is installed in the valve body 1, and it should be noted that the inner diameter of the outlet section 12 is larger than the maximum outer diameter of the valve core, namely, the outer diameter of the plugging part 21, so that the valve core is installed in the valve body 1 from the outlet section 12, the outer side wall of the valve body 1 is provided with symmetrically arranged flat clamping parts 15, the valve body 1 can be fixed through the flat clamping parts 15, then the outer sealing ring 9 and the tightening nut M are sleeved on the valve joint 8, the guide structure A80 on the valve joint 8 is aligned with the lower valve rod 2 to be installed, the valve joint 8 is fixedly connected with the threads of the valve body 1, and in order to ensure the connection effect, anti-loosening glue is coated at the threads of the two.

In normal use, when the user uses water downstream of the pressure release valve, the downstream pressure is lower than the pressure of the main pipe network, the lower valve rod 2 moves downstream under the action of the upstream pressure, as shown in fig. 2, the lower valve rod generally reaches a position against the guide structure a80, when the user stops using water downstream of the pressure release valve, the water flow is static, the pressures of all the positions are the same, and under the pre-pressing action of the check spring 4, the sealing ring 9 abuts against the annular protruding part 14 to seal.

When user water is used on the upstream side of the pressure release valve, namely the pressure in the main pipe network is reduced, the pressure on the downstream side of the protection valve is obviously higher than the pressure on the upstream side, the valve rod 2 cannot move, water flow cannot enter the installation section 11, and the water meter on the downstream side of the protection valve cannot rotate.

When the downstream of the pressure release valve is free of water for a long time, after the difference between the downstream pressure and the upstream pressure overcomes the pre-pressure of the pressure release spring 6 due to the temperature rise, the pressure release spring 6 is compressed, the pressure release plug 5 moves towards the inlet section 10, the lower pressure release hole 20 is completely communicated with the pressure release cavity 23 and is not isolated, at the moment, the downstream water pressure can be communicated with the inlet section 10 through the pressure release cavity 23 and the upper pressure release hole 30, namely, the upstream main pipe network, so that the upstream pressure and the downstream pressure are balanced.

Finally, it should be noted that the above description is only a preferred embodiment of the present utility model, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (10)

1. The utility model provides a low pressure loss prevents rotation relief valve, includes valve body (1) and case, its characterized in that: the valve body (1) comprises an inlet section (10), a mounting section (11) and an outlet section (12) which are integrally formed, wherein the inner diameter of the mounting section (11) is larger than the inner diameters of the inlet section (10) and the outlet section (12), one end of the valve body (1) is provided with a valve joint (8) which is connected in a detachable mode, and one end, close to the valve body (1), of the valve joint (8) is provided with a hollowed-out guide structure A (80);

The valve core comprises a lower valve rod (2), the lower valve rod (2) is in sliding fit with the guide structure A (80) and is supported on the guide structure A (80) through a check spring (4), one end of the lower valve rod (2) far away from the valve joint (8) is provided with a disc-shaped blocking part (21), the blocking part (21) is positioned in the mounting section (11), and the outer diameter of the blocking part is larger than the inner diameter of the inlet section (10) and smaller than the inner diameter of the mounting section (11);

The valve is characterized in that a pressure relief channel is arranged in the valve core, a pressure relief plug (5) is arranged in the lower valve rod (2), a pressure relief spring (6) is arranged between the pressure relief plug (5) and the lower valve rod (2), the valve core is in a stop position under the action of the check spring (4) in an initial state, the plugging part (21) is positioned at the end part of the inlet section (10) and is spatially separated from the mounting section (11), the pressure relief plug (5) is used for blocking the pressure relief channel under the action of the pressure relief spring (6), and when the pressure of the outlet section (12) rises, and the pressure difference between the pressure relief plug and the inlet section (10) is larger than the pre-pressure of the pressure relief spring (6), the pressure relief plug (5) is separated from a blocking position, and the pressure of the outlet section (12) is released to the inlet section (10) through the pressure relief channel.

2. The low pressure loss anti-rotation pressure relief valve according to claim 1, wherein: the valve core is characterized in that the valve core further comprises an upper valve rod (3) fixedly connected with the lower valve rod (2), a pressure release cavity (23) is arranged at a position, close to the end part, in the lower valve rod (2), and a lower section pressure release hole (20) communicated with the pressure release cavity (23), an upper section pressure release hole (30) axially arranged along the upper valve rod (3) is arranged in the upper valve rod (3), a guide structure B (13) in a hollow structure is arranged in the inlet section (10), and the upper valve rod (3) is in sliding fit with the guide structure B (13).

3. The low pressure loss anti-rotation pressure relief valve according to claim 2, wherein: one end of the lower valve rod (2) far away from the valve joint (8) is provided with a sealing ring (7), and when the lower valve rod (2) is in a return stop state, the sealing ring (7) is abutted against a step surface between the inlet section (10) and the mounting section (11).

4. The low pressure loss anti-rotation pressure relief valve according to claim 3, wherein: one end of the upper valve rod (3) close to the lower valve rod (2) is provided with a pressing part (31), the outer diameter of the pressing part (31) is smaller than the inner diameter of the inlet section (10), and the sealing ring (7) is positioned between the pressing part (31) and the plugging part (21).

5. The low pressure loss anti-rotation pressure relief valve according to claim 2, wherein: the pressure release cavity (23) is internally provided with an inner step surface (22), the upper valve rod (3) is provided with an inner ring boss (32) which stretches into the pressure release cavity (23) and is propped against the inner step surface (22), and the end surface of the lower valve rod (2) is fixedly connected with the compressing part (31).

6. The low pressure loss anti-rotation pressure relief valve according to claim 2, wherein: the upper valve rod (3) is provided with a convex column (33) coaxially arranged with the pressure release cavity (23), and the pressure release spring (6) is sleeved on the convex column (33);

The pressure relief plug (5) comprises a plug part (50) and a rod part (51) which are fixed integrally, wherein the diameter of the rod part (51) is smaller than that of the plug part (50), the pressure relief spring (6) is positioned on the outer side of the rod part (51) and is coaxially arranged with the convex column (33), and at least one pressure relief notch (330) formed in the radial direction of the convex column (33) is formed in the end part of the convex column, and/or ribs which are uniformly distributed are formed in the end part of the rod part (51).

7. The low pressure loss anti-rotation pressure relief valve according to claim 6, wherein: the blocking part (50) is provided with pressure relief diversion trenches (52) which are uniformly distributed along the circumferential direction of the blocking part, and the pressure relief diversion trenches (52) are arranged along the axial direction of the rod part (51).

8. The low pressure loss anti-spin relief valve according to claim 3 or 4, wherein: the inlet segment (10) has an annular projection (14) at the end extending into the mounting segment (11), the outer diameter of the annular projection (14) being smaller than the outer diameter of the sealing ring (7).

9. The low pressure loss anti-rotation pressure relief valve according to claim 1, wherein: the valve body (1) is in threaded fit with the valve joint (8), and an outer sealing ring (9) is arranged between the valve body and the valve joint.

10. The low pressure loss anti-rotation relief valve according to claim 1 or 9, characterized in that: the maximum outer diameter of the valve joint (8) is smaller than the inner diameter of the mounting section (11), the valve joint (8) is provided with a tensioning nut (M), the outer end of the valve joint (8) is provided with an outer ring boss (81), and one end of the valve joint (8) far away from the valve body (1) is of an inner flat square hole structure.