CN112483657B

CN112483657B - Straight-stroke black water angle valve

Info

Publication number: CN112483657B
Application number: CN202011367237.5A
Authority: CN
Inventors: 高永辉
Original assignee: Wuhan Hande Valve Co ltd
Current assignee: Wuhan Hande Valve Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2022-04-26
Anticipated expiration: 2040-11-27
Also published as: CN112483657A

Abstract

The utility model relates to a black water angle valve of straight stroke relates to valve equipment technical field, and this black water angle valve of straight stroke includes valve body and case subassembly, and it still includes: the diffusion pipe is internally provided with a first accommodating cavity, a second accommodating cavity and a third accommodating cavity which are sequentially communicated; the valve seat sleeve is arranged in the valve body and the first accommodating cavity, a first valve seat is arranged in the valve seat sleeve, and the first valve seat is provided with a first valve cavity; the pressure reducing pore plate is arranged in the third accommodating cavity, the middle part of the pressure reducing pore plate is provided with a through hole for the second valve seat to penetrate through, and the second valve seat is provided with a second valve cavity; and the two ends of the bushing are respectively abutted against the first valve seat and the second valve seat to form a pressurizing channel. This application, the high pressure differential of medium around can reducing first disk seat weakens the medium and to the washing away of case and first disk seat, improves the life of first disk seat and case, still with fluidic high pressure differential part switch-over to the second disk seat around, second valve seat easy dismounting, easily maintenance change.

Description

Straight-stroke black water angle valve

Technical Field

The application relates to the technical field of valve equipment, in particular to a straight-stroke black water angle valve.

Background

Currently, angle valves, i.e., angle shut-off valves, are modified from ball-type valves in their construction and characteristics, differing from ball-type valves in that the outlet of the angle valve is at a 90 degree right angle to the inlet.

In the related technology, the black water angle valve is widely applied to the field of coal chemical industry, in particular to the working conditions of black water and grey water media containing a coal water slurry gasification process and powder media containing a dry coal powder gasification process in a coal chemical gasification device.

However, because the black water regulating valve works in a medium of high temperature, high pressure and gas, liquid and solid three-phase flow for a long time, internal parts of the valve are frequently washed and damaged by the high-speed medium, and the service life of a valve core and a valve seat in the valve is greatly shortened.

Disclosure of Invention

To the defect that exists among the prior art, the utility model aims at providing a straight stroke black water angle valve to solve the problem that the life of case and disk seat is shorter among the correlation technique.

In order to achieve the purposes, the technical scheme adopted by the application is as follows: the utility model provides a straight stroke black water angle valve, includes that valve body and part set up the case subassembly in the valve body, it still includes:

the diffusion pipe is connected to the water outlet of the valve body, a first accommodating cavity, a second accommodating cavity and a third accommodating cavity which are communicated in sequence are arranged in the diffusion pipe, and the cross section size of the second accommodating cavity is smaller than that of the first accommodating cavity and that of the third accommodating cavity;

the valve seat sleeve is assembled in the valve body and the first accommodating cavity, a first valve seat is arranged in the valve seat sleeve, and a first valve cavity is formed in the first valve seat;

the pressure reducing pore plate is arranged in the third accommodating cavity, a through hole for the second valve seat to penetrate is formed in the middle of the pressure reducing pore plate, and the second valve seat is provided with a second valve cavity;

and the two ends of the lining are respectively abutted against the first valve seat and the second valve seat to form a pressurizing channel which is respectively communicated with the first valve cavity and the second valve cavity and has an inner diameter larger than that of the first valve cavity and the second valve cavity.

In some embodiments, the valve seat sleeve includes a sleeve and a positioning ring sleeved outside an end of the sleeve, and two end faces of the positioning ring are each provided with an annular groove for placing the sealing ring.

In some embodiments, the first valve seat includes a first cylindrical body and a first liner plate sleeved outside an end of the first body, the first body is sleeved in the sleeve, a first groove is formed in an end surface of the positioning ring away from the sleeve, and the first liner plate is located in the first groove.

In some embodiments, the positioning ring has a plurality of mounting holes formed along a circumferential direction, the mounting holes are located outside the annular groove, and the mounting holes have internal threads formed therein.

In some embodiments, an inner diameter of the second valve chamber gradually increases from the second accommodating chamber to a third accommodating chamber, and an inner diameter of a large-diameter end of the second valve chamber is the same as an inner diameter of the first valve chamber.

In some embodiments, the second valve seat includes a cylindrical second body and a second lining board sleeved outside an end of the second body, the second body is disposed through the through hole, the pressure reducing pore plate is further disposed with a second groove communicated with the through hole, and the second lining board is disposed in the second groove.

In some embodiments, the first valve seat, the liner, and the second valve seat are made of tungsten carbide.

In some embodiments, the valve core assembly comprises:

a valve element disposed in the valve body, wherein an end surface of the valve element facing the first valve seat contacts with an inner wall of the first valve chamber to form a sealing surface;

and one end of the valve rod is connected with the valve core, the other end of the valve rod penetrates out of the valve body, and the end part of the valve rod is connected with the straight stroke cylinder.

In some embodiments, the valve core includes a post rod and a valve core head sleeved on the post rod, an external thread is disposed at one end of the post rod away from the valve core head, and an internal thread hole matched with the external thread is disposed at one end of the valve rod.

In some embodiments, a pin hole communicating with the internal threaded hole is formed in a side wall of the valve rod, an anti-rotation pin is inserted into the pin hole, and the anti-rotation pin penetrates through the pin hole to be connected with the ejector rod.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a straight-stroke black water angle valve, because a water outlet of a valve body is connected with a diffusion pipe, a first accommodating cavity, a second accommodating cavity and a third accommodating cavity which are sequentially communicated are arranged in the diffusion pipe, a valve seat sleeve is arranged in the first accommodating cavity of the valve body and the diffusion pipe, a first valve seat is arranged in the valve seat sleeve, two ends of the first valve seat are respectively communicated with the water outlet of the valve body and the second accommodating cavity, a pressure reducing pore plate is arranged in the third accommodating cavity, a second valve seat is arranged in the middle of the pressure reducing pore plate, two ends of the second valve seat are respectively communicated with the second accommodating cavity and the water outlet end of the diffusion pipe, a lining is arranged in the second accommodating cavity, two ends of the lining are respectively abutted against the first valve seat and the second valve seat and form a pressurizing channel which is respectively communicated with the first valve cavity and the second valve cavity and has an inner diameter larger than that of the first valve cavity and the second valve cavity, therefore, pressure concentration of an outlet of the first valve seat can be realized through the pressurizing channel, in order to increase the pressure of first disk seat export, reduce the high pressure differential of medium around the first disk seat, not only weaken the medium to the erodeing of case and first disk seat, improve the life of first disk seat and case, still with fluidic high pressure differential part switch-over around the second disk seat, and the second valve seat passes through the pressure reduction orifice plate and installs in the diffuser, easy dismounting, but easy maintenance change.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a straight-stroke black water angle valve according to an embodiment of the present application;

FIG. 2 is an enlarged view of A in FIG. 1;

FIG. 3 is a partial schematic view of a straight travel black water angle valve according to an embodiment of the present application;

FIG. 4 is a schematic illustration of a valve seat insert coupled to a first valve seat in accordance with an embodiment of the present application;

fig. 5 is a partial schematic view of a valve core assembly according to an embodiment of the present application.

Reference numerals:

1. a valve body; 11. a water inlet; 12. a water outlet; 13. a scraper; 14. a filler; 15. a filler spacer sleeve; 16. pressing and sleeving the filler; 17. a packing press plate;

2. a valve core assembly; 21. a valve core; 211. a top rod; 212. a valve core head; 22. a valve stem; 23. anti-rotation pins;

3. a diffuser tube;

4. a valve seat sleeve; 41. a sleeve; 42. a positioning ring; 421. an annular groove; 422. a seal ring; 423. disassembling and assembling holes;

5. a first valve seat; 50. a first valve chamber; 51. a first body; 52. a first liner plate;

6. a pressure reducing orifice plate; 61. a socket head cap screw;

7. a second valve seat; 70. a second valve cavity; 71. a second body; 72. a second liner plate;

8. a bushing; 81. a pressurizing passage;

9. a straight stroke cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a straight-stroke black water angle valve, which can solve the problem that the service lives of a valve core and a valve seat are short in the related art.

As shown in fig. 1 and 3, a straight-stroke black water angle valve comprises a valve body 1 and a valve core assembly 2 partially arranged in the valve body 1, wherein the valve body 1 is provided with a water inlet 11 and a water outlet 12. The straight-stroke black water angle valve further comprises a diffusion pipe 3, a valve seat sleeve 4, a first valve seat 5, a pressure reduction orifice plate 6, a second valve seat 7 and a bushing 8.

The diffuser pipe 3 is connected to the water outlet of the valve body 1, and in this embodiment, the water outlet of the valve body 1 is located at the lower end of the valve body, so the diffuser pipe 3 is located below the valve body. A first accommodating cavity, a second accommodating cavity and a third accommodating cavity which are communicated in sequence are arranged in the diffusion pipe 3, and the first accommodating cavity is communicated with a water outlet of the valve body 1. The cross-sectional dimension of the second accommodating cavity is smaller than that of the first accommodating cavity and that of the third accommodating cavity. Optionally, the first accommodating cavity, the second accommodating cavity and the third accommodating cavity are all cylindrical cavities, that is, the inner diameter of the second accommodating cavity is smaller than the inner diameters of the first accommodating cavity and the third accommodating cavity. Optionally, the diffuser tube 3 is further provided with a water outlet end, and the water outlet end is communicated with the third accommodating cavity.

The valve seat sleeve 4 is assembled in the valve body 1 and the first accommodating cavity, a first valve seat 5 is arranged in the valve seat sleeve 4, the first valve seat 5 is provided with a first valve cavity 50, and two ends of the first valve cavity 50 are respectively communicated with the water outlet of the valve body 1 and the second accommodating cavity.

The pressure reducing pore plate 6 is arranged in the third accommodating cavity, a through hole for the second valve seat 7 to penetrate is formed in the middle of the pressure reducing pore plate 6, the second valve seat 7 is provided with a second valve cavity 70, and two ends of the second valve cavity 70 are respectively communicated with the second accommodating cavity and the water outlet end of the diffusion pipe.

Wherein, the pressure reducing pore plate 6 adopts the hexagon socket head cap screw 61 to fasten in the third holding cavity of the diffusion tube 3, and the maintenance and the replacement are convenient.

The bushing 8 is disposed in the second receiving cavity of the diffuser 3, and both ends of the bushing 8 are respectively abutted against the first valve seat 5 and the second valve seat 7 to form a pressurizing passage 81 which is respectively communicated with the first valve cavity 50 and the second valve cavity 70 and has an inner diameter larger than that of the first valve cavity 50 and the second valve cavity 70.

Preferably, the inner diameter of the pressurizing passage 81 may be larger than twice the inner diameter of the first valve chamber 50 to further enhance the pressurizing effect.

In the straight-stroke black water angle valve of the present embodiment, when the flow rate passing through the straight-stroke black water angle valve is a relatively fixed value, the throttle area is inversely proportional to the flow rate, the smaller the throttle area is, the higher the flow rate is, the larger the throttle area is, the lower the flow rate is, and the throttle area needs to be increased in order to obtain the lower flow rate. However, according to bernoulli's equation in hydrodynamics, when the flow rate of passing through is a relative fixed value, the throttling product is increased, and the front-rear pressure difference of the valve seat must be reduced, so that the pressure accumulation of the outlet of the first valve seat can be realized through the pressurizing channel 81, the pressure of the outlet of the first valve seat is increased, the high pressure difference of the medium in front of and behind the first valve seat is reduced, the flushing of the medium on the valve core and the first valve seat is weakened, the service lives of the first valve seat and the valve core are prolonged, the high pressure difference part of the fluid is switched to the front side and the rear side of the second valve seat, and the second valve seat is installed in the diffusion tube through the pressure reducing orifice plate, so that the valve is convenient to disassemble and assemble, and can be easily maintained and replaced.

As shown in fig. 4, the valve seat sleeve 4 further includes a sleeve 41 and a positioning ring 42, the positioning ring 42 is sleeved outside an end portion of the sleeve 41, two end surfaces of the positioning ring 42 are each provided with an annular groove 421 for placing a sealing ring 422, and two end surfaces of the positioning ring 42 are respectively sealed with an end surface of the valve body 1 and an end surface of the diffuser 3 by one sealing ring 422.

In this embodiment, the sealing ring 422 is a metal winding pad, and when the metal winding pad is placed in the annular groove 421, the valve body 1 and the diffusion tube can be screwed and fastened through a third hexagon nut and a third stud, so as to ensure the sealing effect of the metal winding pad.

In this embodiment, the positioning ring 42 has a plurality of detachable holes 423 along the circumferential direction, the detachable holes 423 are located outside the annular groove 421, and the detachable holes 423 have internal threads. When this embodiment needs dismouting maintenance after using, can be directly with the screw rod screw in this dismouting hole 423, then through the screw rod pull out valve seat cover 4 can for the dismouting is simple, convenient and quick, need not extra specialized tool.

In this embodiment, the first valve seat 5 includes a cylindrical first body 51 and a first liner plate 52 sleeved outside an end of the first body 51, the first body 51 is sleeved in the sleeve 41, a first groove is formed on an end surface of the positioning ring 42 away from the sleeve 41, and the first liner plate 52 is located in the first groove.

Optionally, the first valve chamber 50 is a cylindrical chamber, and the end of the first valve seat 5 facing the valve body 1 is further provided with an inner conical surface, and the small diameter end of the inner conical surface is connected to the cylindrical side wall of the first valve chamber 50.

Preferably, the inner diameter of the second valve chamber 70 is gradually increased from the second accommodating chamber to the third accommodating chamber, and the inner diameter of the large diameter end of the second valve chamber 70 is the same as the inner diameter of the first valve chamber 50, so as to reduce the pressure difference before and after the second valve seat 7 as much as possible.

The flow area of the first valve cavity 50 is increased, and the flow capacity of the first valve seat 5 can be ensured to be unchanged under the condition that the pressurizing passage 81 exists, so that the flow speed of the medium is reduced, and the medium scouring is weakened.

Further, the second valve seat 7 includes a second body 71 having a cylindrical shape and a second liner plate 72, and the second liner plate 72 is fitted around an outer side of an end portion of the second body 71. The second body 71 is disposed through the through hole of the pressure reducing pore plate 6, the pressure reducing pore plate 6 is further provided with a second groove communicated with the through hole, and the second lining plate 72 is located in the second groove.

In this embodiment, the first valve seat 5, the liner 8, and the second valve seat 7 are made of tungsten carbide. The pressure reduction pore plate 6 is designed by 316L + tungsten carbide, the first valve seat 5 and the second valve seat 7 are both integrally thickened with tungsten carbide, and HRA is more than or equal to 90.

Alternatively, the first valve seat 5 may be first hot-fitted into the valve seat sleeve 4, and the second valve seat 7 may be hot-fitted into the through hole of the pressure reducing orifice plate 6, so as to respectively realize the interference fit between the first valve seat 5 and the valve seat sleeve 4, and the interference fit between the second valve seat 7 and the pressure reducing orifice plate 6.

In other embodiments, the first valve seat 5, the liner 8 and the second valve seat 7 may be integrally formed and made of tungsten carbide, which may effectively avoid the leakage.

In this embodiment, the valve core assembly 2 includes a valve core 21 and a valve stem 22. The valve stem 22 is a stainless steel valve stem.

The valve body 1 is provided with the valve body 21, and an end surface of the valve body 21 facing the first valve seat 5 is in contact with an inner side wall of the first valve chamber 50 to form a sealing surface.

One end of the valve rod 22 is connected with the valve core 21, the other end of the valve rod 22 penetrates out of the valve body 1, and the end part penetrating out of the valve body 1 is connected with the straight stroke cylinder 9.

The piston of the straight stroke cylinder 9 is pushed to move upwards after air is fed from the lower end of the straight stroke cylinder, the spring on the upper part of the piston is compressed, the piston rod drives the valve core assembly 2 to move upwards, and the valve is opened. After the lower end of the straight stroke cylinder 9 loses air, the spring on the upper part of the piston is reset, the compression piston moves downwards, the piston rod drives the valve core assembly 2 to move downwards, and the valve is closed.

As shown in fig. 5, further, the valve core 21 includes a top rod 211 and a valve core head 212, and the valve core head 212 is sleeved on one end of the top rod, that is, the valve core covers the top rod 211.

In this embodiment, the outer surface of the valve core head 212 is sequentially an outer cylindrical surface, a first outer conical surface with gradually decreasing outer diameter, and a second outer conical surface with gradually decreasing outer diameter, that is, the outer diameter of the large-diameter end of the first outer conical surface is the same as the outer diameter of the outer cylindrical surface, the outer diameter of the large-diameter end of the second outer conical surface is the same as the outer diameter of the small-diameter end of the first outer conical surface, and one end of the outer cylindrical surface, which is far away from the first outer conical surface, is connected to the valve rod 22

Preferably, the included angle between the first external conical surface and the axis thereof is greater than the included angle between the second external conical surface and the axis thereof, and the included angle between the first external conical surface and the axis thereof is less than the included angle between the internal conical surface of the first valve seat 5 and the axis thereof, so that the valve core head 212 can enter the first valve chamber 50 along the internal conical surface of the first valve seat 5 and is sealed with the first valve chamber 50.

The end of the ejector rod 211, which is far away from the valve core head 212, is provided with an external thread, one end of the valve rod 22 is provided with an internal thread hole matched with the external thread, and the valve core 21 is fixed on the valve rod 22 through the matching of the ejector rod 211 and the internal thread hole.

In this embodiment, the valve core head 212 is made of tungsten carbide material to increase the wear-resistant and flushing-resistant performance.

Optionally, a pin hole communicating with the internal thread hole is formed in a side wall of the valve rod 22, an anti-rotation pin 23 penetrates through the pin hole, and the anti-rotation pin 23 penetrates through the pin hole to be connected with the ejector rod 211. Wherein, the pin hole is provided with an internal thread matched with the anti-rotation pin 23. Through the anti-rotation pin 23, even under the high-pressure medium flushing, the valve core head 212 and the valve rod 22 can be ensured not to fall off.

Wherein, after ejector pin 211 and valve rod 22 threaded connection, join in marriage the brill on valve rod 22 and prevent changeing pin 23 to will prevent changeing pin 23 head and valve rod welding, can realize preventing the not hard up effect of screw thread.

As shown in fig. 2, in this embodiment, after the spool 21 of the spool assembly 2 extends into the valve body 1, the scraper 13, the packing 14 and the packing spacer 15 are sequentially sleeved on the valve rod 22, and then the packing pressing sleeve 16 and the packing pressing plate 17 are screwed and fastened with the valve body 1 through the first hexagon nut and the first stud to press the packing, so as to ensure the sealing effect of the packing, and finally the straight-stroke cylinder 9 and the valve body are screwed and fastened through the second hexagon nut and the second stud.

The straight-stroke black water angle valve of the embodiment is characterized in that a pressure reduction pore plate and a second valve seat structure are additionally arranged behind a first valve seat according to a high flow speed working condition generated by high pressure difference between the front and the back of the first valve seat, and a pressurizing channel communicated with the first valve cavity and the second valve cavity is formed by utilizing a lining so as to reduce the front and back pressure difference of the first valve seat, so that the flow speed of a medium flowing through the valve core and the first valve seat is greatly reduced, the scouring of the medium on the surface of the valve core and the surface of the first valve seat is weakened, and the service life of the valve core and the service life of the first valve seat are prolonged.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a straight stroke black water angle valve, includes valve body (1) and part sets up case subassembly (2) in valve body (1), its characterized in that, it still includes:

the diffusion pipe (3) is connected to the water outlet of the valve body (1), a first accommodating cavity, a second accommodating cavity and a third accommodating cavity which are sequentially communicated are arranged in the diffusion pipe (3), and the cross section size of the second accommodating cavity is smaller than that of the first accommodating cavity and that of the third accommodating cavity;

the valve seat sleeve (4) is assembled in the valve body (1) and the first accommodating cavity, a first valve seat (5) is arranged in the valve seat sleeve (4), and a first valve cavity (50) is arranged in the first valve seat (5);

the pressure reducing pore plate (6) is arranged in the third accommodating cavity, a through hole for a second valve seat (7) to penetrate through is formed in the middle of the pressure reducing pore plate (6), and a second valve cavity (70) is formed in the second valve seat (7);

and the two ends of the bush (8) are respectively abutted against the first valve seat (5) and the second valve seat (7) to form a pressurizing channel (81) which is respectively communicated with the first valve cavity (50) and the second valve cavity (70) and has an inner diameter larger than that of the first valve cavity (50) and the second valve cavity (70).

2. The straight run black water angle valve of claim 1, wherein: the valve seat cover (4) comprises a sleeve (41) and a positioning ring (42) sleeved outside the end part of the sleeve (41), wherein two end faces of the positioning ring (42) are provided with annular grooves (421) for placing sealing rings (422).

3. The straight run black water angle valve of claim 2, wherein: first disk seat (5) are including being first body (51) of tube-shape and first welt (52) of locating first body (51) tip outside with the cover, first body (51) cover is located in sleeve (41), the terminal surface that sleeve (41) were kept away from in holding ring (42) is equipped with first recess, first welt (52) are located in the first recess.

4. The straight run black water angle valve of claim 2, wherein: the positioning ring (42) is circumferentially provided with a plurality of disassembling and assembling holes (423), the disassembling and assembling holes (423) are located on the outer side of the annular groove (421), and internal threads are formed in the disassembling and assembling holes (423).

5. The straight run black water angle valve of claim 1, wherein: the inner diameter of the second valve cavity (70) is gradually increased from the second accommodating cavity to the third accommodating cavity, and the inner diameter of the large-diameter end of the second valve cavity (70) is the same as that of the first valve cavity (50).

6. The straight run black water angle valve of claim 5, wherein: the second valve seat (7) comprises a cylindrical second body (71) and a second lining plate (72) sleeved on the outer side of the end part of the second body (71), the second body (71) penetrates through the through hole, the pressure reduction pore plate (6) is further provided with a second groove communicated with the through hole, and the second lining plate (72) is located in the second groove.

7. The straight run black water angle valve of claim 1, wherein: the first valve seat (5), the lining (8) and the second valve seat (7) are all made of tungsten carbide materials.

8. The straight run black water angle valve of claim 1, wherein the spool assembly (2) comprises:

the valve core (21) is arranged in the valve body (1), and the end surface of the valve core (21) facing to the first valve seat (5) is in contact with the inner wall of the first valve cavity (50) to form a sealing surface;

and one end of the valve rod (22) is connected with the valve core (21), the other end of the valve rod penetrates out of the valve body (1), and the end part of the valve rod is connected with the straight stroke cylinder (9).

9. The straight run black water angle valve of claim 8, wherein: the valve core (21) comprises an ejector rod (211) and a valve core head (212) sleeved on the ejector rod (211), wherein an external thread is arranged at one end, away from the valve core head (212), of the ejector rod (211), and an internal thread hole matched with the external thread is formed at one end of the valve rod (22).

10. The straight stroke black water angle valve of claim 9, wherein: the lateral wall of valve rod (22) be equipped with the pin hole of internal thread hole intercommunication, wear to be equipped with in the pin hole and prevent changeing pin (23), prevent changeing pin (23) and pass the pin hole is connected with ejector pin (211).