High-pressure stop valve with wear-resistant interior

Abstract

The high-pressure stop valve comprises a valve seat, a valve rod mechanism, a driving hand wheel and a sealing assembly, a stop cavity with an upward opening is formed in the middle of the valve seat, the stop cavity extends upwards, an annular cavity wall protruding out of the valve seat is arranged around the stop cavity, and the sealing assembly correspondingly covers an upper end opening of the stop cavity. The driving hand wheel is arranged above the sealing assembly, the center of the driving hand wheel is connected with the valve rod mechanism, and the valve rod mechanism penetrates through the sealing assembly and extends downwards into the cut-off cavity. The joint of the upper part and the lower part of the cut-off cavity is a valve seat sealing surface; the valve rod mechanism comprises a valve rod and a spherical valve plug, the spherical valve plug is rotationally connected to the bottom of the valve rod, the spherical valve plug and the valve seat sealing surface are arranged oppositely up and down, the valve seat sealing surface is a spherical surface, and the radius of the spherical surface corresponding to the valve seat sealing surface is consistent with the radius of the spherical valve plug; the stop valve has the advantages that the interior is not prone to abrasion, and the service life is long.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of stop valve, concretely relates to an internal anti-abrasion high-pressure stop valve. BACKGROUND

[0002] The wide application field of high-pressure stop valve includes power station system, such as thermal power plant, hydroelectric power plant, steam power station or nuclear power station etc., in these systems, high-pressure stop valve can resist high temperature and high pressure environment, and provides safe and reliable fluid control service for facility or transportation power. The main function of high-pressure stop valve is to control the flow of material in pipeline, the opening and closing part of high-pressure stop valve is plug type valve clack, the valve clack of stop valve moves vertically along the center line of valve seat, relies on the spinning of valve stem screw thread, makes the sealing surface of stop valve clack and the sealing surface of valve seat tightly adhere together, thereby stop medium flow. Since pressure must be applied to valve clack to ensure forced sealing and prevent fluid leakage, plug type valve clack appears the following problems in the process of repeatedly pressing and rotating friction with sealing surface: one is that the surface of valve clack is scratched, and breakage appears under high temperature and high pressure water washing, which causes leakage point, two is that the sealing pressure surface of valve body is damaged, and the compactness of sealing surface is not good, which also causes leakage point; the two problems easily lead to difficult opening of stop valve and shorten the service life of stop valve, therefore, the stop valve needs to be improved to solve the problem of easy abrasion of valve clack and valve body. SUMMARY

[0003] In view of the above problems and technical requirements, the utility model provides an internal anti-abrasion high-pressure stop valve, the valve stem and valve plug of the high-pressure stop valve are arranged as rotating connection structure, and the shape of valve plug is spherical, so that mutual friction is avoided when pressing the sealing surface, the sealing surface and valve plug are prevented from being damaged, and the service life is prolonged.

[0004] The technical scheme of the utility model is as follows: an internal anti-abrasion high-pressure stop valve, including valve seat, valve stem mechanism, driving hand wheel and sealing assembly, the middle part of valve seat is equipped with the stop cavity with the opening upwards, the stop cavity extends upwards, the circular annular cavity wall protruding from the valve seat is arranged around the stop cavity, the sealing assembly corresponds to the upper end of the stop cavity, the driving hand wheel is arranged above the sealing assembly, the center of the driving hand wheel is connected with the valve stem mechanism, the valve stem mechanism extends downwards to the stop cavity through the sealing assembly;The diameter of the upper part of the stop cavity is greater than the diameter of the lower part, and the connecting part of the upper part and the lower part of the stop cavity is the valve seat sealing surface;The valve stem mechanism includes valve stem and spherical valve plug, the spherical valve plug is rotatably connected to the bottom of the valve stem, the spherical valve plug is arranged oppositely above and below the valve seat sealing surface, the valve seat sealing surface is spherical, the radius of the spherical surface corresponding to the valve seat sealing surface is consistent with the radius of the spherical valve plug, the driving hand wheel controls the up and down movement of the valve stem along the center line of the valve seat, the liquid flow passage in the valve seat is arranged transversely through the stop cavity, the downward movement of the valve stem makes the spherical valve plug tightly seal on the valve seat sealing surface, and the liquid flow passage is cut off.

[0005] Further, the valve rod is cylindrical, the bottom end surface of the valve rod is provided with a blind hole, a rotating bearing is installed in the blind hole, a fixed connecting piece is installed on the spherical valve plug, the upper end of the fixed connecting piece is connected in the rotating bearing, and the valve rod can rotate around the center line relative to the spherical valve plug in the compressed fixed state.

[0006] Further, the liquid flow channel in the valve seat includes an inlet liquid flow channel and an outlet liquid flow channel, the inlet liquid flow channel is obliquely downward from the peripheral surface of the valve seat into the lower part of the cutoff cavity, the outlet liquid flow channel is obliquely downward from the upper part of the cutoff cavity, and the outlet port of the outlet liquid flow channel is arranged on the other peripheral surface of the valve seat.

[0007] Further, the valve cover is provided on the valve seat, the valve cover is a cylindrical structure, a retaining ring is arranged on the outer side of the valve cover, the retaining ring is arranged on the port of the cavity wall, and a locking nut is further arranged on the outer side of the valve cover.

[0008] Further, the sealing assembly includes a packing gland, a compression nut, a flexible isolation sleeve, and packing, a limiting groove is arranged in the middle part of the valve rod, the flexible isolation sleeve is arranged between the limiting groove and the inner wall of the valve cover, the packing is arranged in the annular space below the flexible isolation sleeve, the packing gland is arranged above the flexible isolation sleeve, the packing gland is cylindrical, the inner wall of the packing gland is threadedly connected with the outer side of the valve rod, the outer side of the lower part of the packing gland is fixedly connected with the inner wall of the valve cover, and the compression nut is arranged on the outer side of the upper part of the packing gland.

[0009] Further, the packing is flexible graphite, and the number of layers of the packing is 5-6.

[0010] Further, the top of the valve rod penetrates into the core part of the driving hand wheel, the peripheral surface of the top of the valve rod is provided with a positioning hole, the driving hand wheel is provided with a positioning groove corresponding to the positioning hole, the positioning groove and the positioning hole are locked and connected through a positioning pin, and a hexagonal cap screw for clamping the positioning pin is arranged in the slot of the positioning groove.

[0011] The utility model discloses a beneficial effect: 1) set up between the valve stem and the spherical valve plug into the rotating structure, under the support of the rotating bearing, when the valve stem drives the spherical valve plug to be pressed down tightly, the spherical valve plug and the valve seat sealing surface pressure tight state, the valve stem continues to rotate and does not drive the spherical valve plug to rotate, that is, avoids the spherical valve plug and the valve seat sealing surface between the mutual friction, mutual scratch scratch situation, guarantees the rigidity and the compactness of the valve plug and the valve seat sealing surface surface, after the high temperature high pressure water flow scouring, not easy to appear breakage and leakage point, prolongs the service life, 2) the spherical valve plug's pressure tight surface is the spherical body, and the spherical surface diameter of valve seat sealing surface is identical with the spherical valve plug, when processing, adopts the steel ball of same diameter with the spherical valve plug to press the sealing surface of the valve seat and grinds, makes the valve body sealing surface after processing compactness good, and is completely adapted with the spherical valve plug, so when the spherical valve plug is pressed down tightly, can not impact the sealing surface, increases the leakproofness, and can also prevent the deformation breakage of sealing surface. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is the sectional structure diagram of high pressure stop valve of the utility model internal antiwear;

[0013] Fig. 2 It is the structure diagram of valve stem mechanism in the utility model;

[0014] Fig. 3 It is the structure diagram of valve seat in the utility model;

[0015] Marked as in the drawing: drive hand wheel 1, positioning groove 11, positioning pin 12, internal hexagon lock screw 13, sealing assembly 2, packing gland 21, compression nut 22, flexible isolation sleeve 23, packing 24, valve stem mechanism 3, valve stem 31, blind hole 311, limit recess 312, positioning hole 313, spherical valve plug 32, rotating bearing 33, fixed connecting piece 34, valve seat 4, cavity wall 41, stop cavity 42, valve seat sealing surface 43, liquid flow channel 44, liquid inlet flow channel 441, liquid outlet flow channel 442, valve cover 5, baffle ring 51, locking nut 6. DETAILED DESCRIPTION

[0016] The utility model will be further described below in connection with the drawings and examples.

[0017] As Figs. 1-3The utility model discloses an internal anti-abrasion high-pressure stop valve, including valve seat 4, valve rod mechanism 3, drive hand wheel 1 and sealing assembly 2, the middle part of valve seat 4 is equipped with the open stop cavity 42 of up, stop cavity 42 extends upwards, and the annular cavity wall 41 of protruding valve seat is equipped around stop cavity 42, and sealing assembly 2 corresponds to cover the upper end of stop cavity 42, drive hand wheel 1 is set above sealing assembly 2, and drive hand wheel 1 center is connected valve rod mechanism 3, and valve rod mechanism 3 passes through sealing assembly 2 and extends downwards to stop cavity 42;The diameter of stop cavity 42 upper part is greater than the lower diameter, and the junction of stop cavity 42 upper part and lower part is valve seat sealing surface 43.

[0018] Valve rod mechanism 3 includes valve rod 31 and spherical valve plug 32, and spherical valve plug 32 is rotatably connected at the bottom of valve rod 31, and spherical valve plug 32 is arranged oppositely with valve seat sealing surface 43, and valve seat sealing surface 43 is spherical surface, and the radius of spherical surface corresponding to valve seat sealing surface 43 is consistent with the radius of spherical valve plug 32, and drive hand wheel 1 controls valve rod 31 to move up and down along the center line of valve seat, and liquid flow channel 44 in valve seat 4 is arranged transversely through stop cavity 42, and valve rod 31 moves downwards, so that spherical valve plug 32 is pressed tightly on valve seat sealing surface 43, and liquid flow channel 44 is cut off.The pressing surface of spherical valve plug 32 is spherical body, and the diameter of spherical surface of valve seat sealing surface 43 is consistent with spherical valve plug, and when processing, the same diameter steel ball as spherical valve plug is used to press and grind the sealing surface of valve seat, so that the sealing surface of the processed valve body is good in compactness, and is completely adapted to spherical valve plug, so that when spherical valve plug is pressed downwards, impact on the sealing surface can not be generated, the sealing property is increased, and deformation and damage of the sealing surface are prevented.

[0019] Liquid flow channel 44 in valve seat 4 includes liquid inlet channel 441 and liquid outlet channel 442, and liquid inlet channel 441 is obliquely downward from the periphery of valve seat and enters the lower part of stop cavity 42, and liquid outlet channel 442 is obliquely downward from the upper part of stop cavity 42, and the outlet port of liquid outlet channel 442 is arranged on the periphery of the other side of valve seat.High-temperature and high-pressure liquid enters the lower part of stop cavity 42 from liquid inlet channel, and valve rod 31 drives spherical valve plug 32 to be pressed tightly on valve seat sealing surface 43, so that the upper and lower parts of stop cavity 42 are isolated, and the purpose of stopping liquid flow is achieved.

[0020] The valve stem 31 is cylindrical, the bottom end surface of the valve stem 31 is provided with a blind hole 311, a rotating bearing 33 is installed in the blind hole 311, a fixed connecting piece 34 is installed on the spherical valve plug 32, the upper end of the fixed connecting piece 34 is connected in the rotating bearing 33, and the spherical valve plug 32 is in a compressed fixed state. The valve stem 31 can rotate around the center line relative to the spherical valve plug 32. The top of the valve stem 31 penetrates into the core of the drive hand wheel 1, the peripheral surface of the top of the valve stem 31 is provided with a positioning hole 313, the drive hand wheel 1 is provided with a positioning groove 11 corresponding to the positioning hole 313, the positioning groove 11 and the positioning hole 313 are locked and connected by inserting a positioning pin 12, and the slot of the positioning groove 11 is provided with a hexagonal cap screw 13 for clamping the positioning pin 12. When the drive hand wheel 1 rotates, the valve stem 31 can be driven to move upward or downward, the spherical valve plug 32 is loosened or compressed on the valve seat sealing surface 43, and the liquid flow passage 44 is opened or cut off.

[0021] The valve cover 5 is provided on the valve seat 4, the valve cover 5 is a cylindrical structure, the outer side of the valve cover 5 is provided with a stop ring 51, the valve cover 5 is provided on the cavity wall 41 of the cut-off cavity 42 corresponding to the cover, and the stop ring 51 is blocked on the port of the cavity wall 41. The outer side of the valve cover 5 is also provided with a locking nut 6, which locks and connects the valve cover 5 and the valve seat 4.

[0022] The sealing assembly 2 includes a packing gland 21, a compression nut 22, a flexible isolation sleeve 23 and a packing 24. A limiting groove 312 is provided in the middle of the valve stem 31, the flexible isolation sleeve 23 is installed between the limiting groove 312 and the inner wall of the valve cover 5, the packing 24 is installed in the annular space above the flexible isolation sleeve 23, the packing gland 21 is provided above the flexible isolation sleeve 23, the packing gland 21 is cylindrical, the inner wall of the packing gland 21 is threadedly connected with the outer side of the valve stem, the outer side of the lower part of the packing gland 21 is fixedly connected with the inner wall of the valve cover, the outer side of the upper part of the packing gland 21 is further provided with the compression nut 22, and the compression nut 22 locks and connects the packing gland 21 and the outer wall of the valve cover. The packing 24 is flexible graphite, and the number of layers of the packing is 5-6 layers.

[0023] The utility model discloses a ball valve, it is including valve body 1, sealing assembly 2 and handle 3, sealing assembly 2 is arranged in valve body 1, handle 3 is connected with valve body 1, its action principle is: high temperature high pressure liquid cut-off is from the liquid inlet channel 441 and flows into cut-off chamber 42, and from liquid outlet channel 442, rotates drive hand wheel 1 and makes valve stem 31 rotate and move downwards, spherical valve plug 32 is gradually pressed on the valve seat sealing surface 43 of spherical surface, and liquid flow passage 44 is cut off, in the process of pressing spherical valve plug 32, valve stem 31 wants to continue to rotate and apply pressure downwards, because spherical valve plug 32 and valve stem 31 bottom are connected through rotating bearing 33, under the friction of spherical valve plug 32 and valve seat sealing surface 43, valve stem 31 does not rotate when rotating and drive spherical valve plug 32 to rotate, avoid the mutual friction of spherical valve plug 32 and valve seat sealing surface 43 and produce scratch, the packing of sealing assembly 2 guarantees the sealing property between valve seat 4 and valve stem 31 in the movement process of valve stem 31, ensure that in non-cut-off state, liquid flow does not flow upwards along valve stem 31 from cut-off chamber, improve the stability of valve body, prolong the service life.

[0024] The above is only the preferable several embodiments of the utility model, but the protection scope of the utility model does not limit to this, any skilled person in the art can easily think of the change and replacement in the technology range disclosed by the utility model, and all should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be the protection scope of the claims.

Claims

1. An internally-wear-protected high-pressure stop valve, characterized by: The valve seat, valve rod mechanism, driving hand wheel and sealing assembly are included, the middle part of the valve seat is provided with an upward opening stop chamber, the stop chamber extends upward, a circular cavity wall protruding from the valve seat is arranged around the stop chamber, the sealing assembly corresponds to the upper end of the stop chamber, the driving hand wheel is arranged above the sealing assembly, the center of the driving hand wheel is connected with the valve rod mechanism, the valve rod mechanism extends downward through the sealing assembly into the stop chamber; the diameter of the upper part of the stop chamber is larger than that of the lower part, the connection part between the upper part and the lower part of the stop chamber is the valve seat sealing surface; the valve rod mechanism includes a valve rod and a spherical valve plug, the spherical valve plug is rotationally connected to the bottom of the valve rod, the spherical valve plug is arranged opposite to the valve seat sealing surface, the valve seat sealing surface is a spherical surface, the radius of the spherical surface corresponding to the valve seat sealing surface is consistent with the radius of the spherical valve plug, the driving hand wheel controls the up-and-down movement of the valve rod along the center line of the valve seat, the liquid flow passage in the valve seat is arranged transversely through the stop chamber, the downward movement of the valve rod makes the spherical valve plug tightly seal on the valve seat sealing surface to cut off the liquid flow passage.

2. A high pressure globe valve with internal wear protection according to claim 1, characterized in that: The valve rod is cylindrical, the bottom end surface of the valve rod is provided with a blind hole, a rotating bearing is installed in the blind hole, a fixed connecting piece is installed on the spherical valve plug, the upper end of the fixed connecting piece is connected in the rotating bearing, in the tightly sealed state of the spherical valve plug, the valve rod can rotate around the center line relative to the spherical valve plug.

3. A high pressure globe valve with internal wear protection according to claim 2, characterized in that: The liquid flow passage in the valve seat includes an inlet flow passage and an outlet flow passage, the inlet flow passage is obliquely downward from the peripheral surface of the valve seat into the lower part of the stop chamber, the outlet flow passage is obliquely downward from the upper part of the stop chamber, the outlet end of the outlet flow passage is arranged on the other peripheral surface of the valve seat.

4. A high pressure globe valve with internal wear protection according to claim 3, characterized in that: A valve cover is arranged on the valve seat, the valve cover is cylindrical structure, a retaining ring is arranged on the outer side of the valve cover, the valve cover corresponds to the upper end of the cavity wall of the stop chamber, the retaining ring is arranged on the port of the cavity wall, a locking nut is further arranged on the outer side of the valve cover, the locking nut tightly connects the valve cover and the valve seat.

5. A high pressure globe valve having internal wear protection according to claim 4, characterized in that: The sealing assembly includes a packing gland, a compression nut, a flexible isolation sleeve and packing, a limiting groove is arranged in the middle part of the valve rod, the flexible isolation sleeve is installed between the limiting groove and the inner wall of the valve cover, the annular space below the flexible isolation sleeve is filled with the packing, the packing gland is arranged above the flexible isolation sleeve, the packing gland is cylindrical, the inner wall of the packing gland is threadedly connected with the outer side of the valve rod, the outer side of the lower part of the packing gland is fixedly connected with the inner wall of the valve cover, the outer side of the upper part of the packing gland is further provided with the compression nut, the compression nut tightly connects the packing gland and the outer wall of the valve cover.

6. A high pressure globe valve having internal wear protection according to claim 5, characterized in that: The packing is flexible graphite, the number of layers of the packing is 5-6 layers.

7. A high pressure globe valve having internal wear protection according to claim 6, characterized in that: The top of the valve rod penetrates into the core of the driving hand wheel, the peripheral surface of the top of the valve rod is provided with a positioning hole, the driving hand wheel is provided with a positioning groove corresponding to the positioning hole, the positioning groove and the positioning hole are locked and connected by inserting a positioning pin therebetween, a hexagonal cap screw is installed in the slot of the positioning groove to tightly press the positioning pin.

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