CN211738048U

CN211738048U - Quick-repair type flushing-free double-core stop valve convenient to replace

Info

Publication number: CN211738048U
Application number: CN202020215321.4U
Authority: CN
Inventors: 苗蕴博
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-10-23
Anticipated expiration: 2030-02-27

Abstract

The utility model belongs to the technical field of the valve technique and specifically relates to a rush repair formula exempts from to brush double-core stop valve convenient to change. The stop valve comprises a valve body, a valve seat, a primary valve core, a limiting disc, a secondary valve core, a valve seat sleeve, a valve cover, a packing gland, a valve rod and a valve driving mechanism, wherein the stop valve is opened and closed, a combined part formed by the primary valve core, the limiting disc and the secondary valve core moves vertically, a free stroke is arranged in the primary valve core, the position of the primary valve core can be automatically corrected under the action of fluid pressure, the secondary valve core cannot give downward thrust to the primary valve core after being completely closed in place, the influence of one valve core on the sealing performance of the other valve core is completely avoided, when the stop valve is in a micro-opening state, the distance between the sealing surface of the secondary valve and the sealing surface of the secondary valve seat is large, the damage caused by the impact. The utility model discloses long service life, sealed effectual, the maintenance of being convenient for is changed.

Description

Quick-repair type flushing-free double-core stop valve convenient to replace

Technical Field

The utility model belongs to the technical field of the valve technique and specifically relates to a rush repair formula exempts from to brush double-core stop valve convenient to change.

Background

The valve is the most widely used equipment in a pipeline system and is widely applied to water supply, drainage and pollution discharge systems of power plants. The traditional stop valve mainly comprises a valve core (valve clack) sealing surface and a valve seat sealing surface, and the valve seat is welded on a valve body by special materials in a surfacing mode. In the long-term use process of the valve, the sealing surface of the valve core (valve clack) and the sealing surface of the valve seat can be damaged due to various reasons, such as impurities in a pipeline, internal leakage of the valve caused by improper operation or slight opening and flushing loss when the valve is slightly opened, and once the valve is damaged, the internal leakage is generated immediately, the whole valve needs to be detached from the pipeline for maintenance or integral replacement, so that the maintenance, maintenance and purchase cost is increased, a large amount of system energy is wasted, and great economic loss is caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a quick-repair formula exempts from to wash double-core stop valve convenient to change overcomes not enough among the aforementioned prior art, and impurity is not fragile valve seal face in the pipeline, and slightly opening the valve can not cause the dashing to decrease to sealed face when having not opening the requirement because of misoperation or valve, and it is convenient to overhaul and maintain, practices thrift the cost, the energy of saving system.

The utility model provides a technical scheme that its technical problem adopted is:

a quick-repair type flushing-free double-core stop valve convenient to replace comprises a valve body and a valve cover mounted at the upper end of the valve body through bolts, wherein the valve body comprises a water chamber, a fluid inlet channel and a fluid outlet channel; the valve seat is provided with a valve seat through hole along the axial direction, the middle lower part of the inner wall of the valve seat through hole is provided with a valve seat primary sealing surface in an inverted circular truncated cone shape, and the top of the valve seat through hole is provided with a valve seat secondary sealing surface in an inverted circular truncated cone shape; the valve seat sleeve is provided with a sleeve through hole along the axial direction, the middle part of the valve seat sleeve is provided with a horizontal fluid through hole, fluid enters from a fluid inlet channel, rises along the outer wall of the valve seat and the outer wall of the valve seat sleeve in the water chamber and enters the fluid through hole, and finally is discharged from a fluid outlet channel communicated with the middle lower part of the water chamber after entering the valve seat through hole from the fluid through hole; a primary valve core is arranged in the valve seat through hole of the valve seat, a primary valve core sealing surface in an inverted round table shape is arranged at the lower end of the primary valve core, the primary valve core sealing surface is matched with the primary sealing surface of the valve seat, and the height of the primary valve core sealing surface is greater than that of the primary sealing surface of the valve seat; a secondary valve core is arranged in the valve seat sleeve, a secondary valve core sealing surface in an inverted round table shape is arranged at the lower end of the secondary valve core, the secondary valve core sealing surface is matched with the secondary valve seat sealing surface, and the height of the secondary valve core sealing surface is greater than that of the secondary valve seat sealing surface; the upper end of the secondary valve core is fixedly connected with the valve rod, the lower end of the secondary valve core is connected with the primary valve core through a connecting mechanism, and the connecting mechanism enables a free stroke to exist between the primary valve core and the secondary valve core; the valve cover is provided with a valve core accommodating cavity and a valve rod through hole from bottom to top along the axis, the valve core accommodating cavity is communicated with the sleeve through hole, the upper end of the valve rod is driven by a valve driving mechanism after penetrating out of the valve rod through hole, the driving mechanism drives the valve rod to move up or down, when the valve rod moves down, the first-stage valve core sealing surface and the first-stage sealing surface of the valve seat firstly realize the abutting sealing, and then the second-stage valve core sealing surface and the second-stage sealing surface of; when the stop valve is closed, a primary valve element sealing surface of the primary valve element is firstly in contact sealing with a primary sealing surface of a valve seat, and is in a primary sealing state, a secondary valve element sealing surface is not in contact with a secondary sealing surface of the valve seat, the fluid of the pipeline is in a static state, and the stop valve reaches a closed state, so that impurities in the pipeline do not move, the secondary valve element sealing surface cannot be damaged, the closing operation is continued, the secondary valve element sealing surface is in contact sealing with the secondary sealing surface of the valve seat, and the secondary sealing state is realized; in the opening process of the stop valve, the primary valve element and the secondary valve element are lifted from bottom to top, the sealing surface of the secondary valve element is firstly separated from the sealing surface of the secondary valve seat, the sealing surface of the primary valve element and the sealing surface of the primary valve seat are still in a contact sealing state, fluid in a pipeline does not flow, the valve opening operation is continued, the separation distance between the sealing surface of the secondary valve and the sealing surface of the secondary valve seat is gradually increased, the sealing surface of the primary valve element and the sealing surface of the primary valve seat are gradually separated, the stop valve is in a slightly-opened state when the sealing surface of the primary valve element is just separated from the sealing surface of the primary valve seat, the distance between the sealing surface of the secondary.

Furthermore, the primary valve core is provided with an accommodating groove from the upper end surface to the lower part along the axial direction.

Furthermore, the connecting mechanism for connecting the primary valve core and the secondary valve core comprises a limiting disc, a first connecting rod and a second connecting rod, the limiting disc is coaxially arranged on the upper end face of the primary valve core, the limiting disc and the primary valve core are fixedly connected through a bolt, the limiting disc is provided with an accommodating through hole from the upper end face downwards along the axial direction, the diameter of the accommodating through hole is smaller than that of the accommodating groove, the diameter of the first connecting rod is matched with that of the accommodating through hole, the diameter of the second connecting rod is matched with that of the accommodating groove, the length of the second connecting rod is smaller than that of the accommodating groove, and the structural arrangement mode of the connecting mechanism is matched with that of the primary valve core and the limiting disc, so that a free stroke is arranged in the primary valve core, and the position of the; because the first-stage valve core is internally provided with the non-through accommodating groove, and the length of the second connecting rod is smaller than the depth of the accommodating groove, the second-stage valve core can not provide downward thrust for the first-stage valve core after being completely closed in place, and the influence of one valve core on the sealing property of the other valve core is completely avoided.

Furthermore, the main part of disk seat is cylindrical structure, and the outer wall lower extreme of disk seat is provided with the first ka tai with the transition draw-in groove matched with of hydroecium, and the outer wall upper end of disk seat is provided with the second ka tai with the telescopic lower extreme matched with of disk seat.

Further, the valve seat perforation of the valve seat comprises a first hole body, a second hole body, a third hole body and a fourth hole body which are sequentially connected from bottom to top, wherein the first hole body, the second hole body and the fourth hole body are cylindrical holes, the third hole body is a circular truncated cone-shaped hole, the diameter of the second hole body is larger than that of the fourth hole body and is larger than that of the first hole body, the valve seat first-level sealing surface is a transition surface of the first hole body and the second hole body, and the valve seat second-level sealing surface is arranged at the top end of the fourth hole body.

Further, the hydroecium upper end of valve body is provided with the round card edge, and the internal diameter on card edge cooperatees with the telescopic upper end external diameter of disk seat, and the telescopic upper end of disk seat is spacing in the card edge and through the spacing fixed of valve gap, and disk seat sleeve and disk seat joint installation are fixed under the valve gap between terminal surface and the disk seat draw-in groove through the valve gap extrusion, and the position is stable, when disk seat or disk seat sleeve appear local damage, only need pull down the valve gap take out the disk seat sleeve and the disk seat maintenance change can, and it is convenient to overhaul, need not whole maintenance or change whole valve body, and the.

Further, the valve driving mechanism is of an electric type, a manual type or a pneumatic type.

Further, the electric valve driving mechanism comprises a bearing chamber, thrust bearings, an electric driving nut, a bearing chamber universal base, a column type valve support rod, a coupling type upper valve rod and a guide plate, wherein the bearing chamber universal base is connected with the upper end surface of the valve body through the column type valve support rod, the upper end of the bearing chamber universal base is provided with the bearing chamber, the bearing chamber is internally provided with two thrust bearings, the electric driving nut is matched with the thrust bearings, the upper end of the coupling type upper valve rod is provided with a T-shaped thread, the electric driving nut is connected with the T-shaped thread of the coupling type upper valve rod, the lower end of the coupling type upper valve rod is a coupling, the upper end of the valve rod is provided with an external thread, the external thread at the upper end of the valve cover is provided with a load nut, the upper end of the valve rod is arranged in the coupling, and the load, a guide plate is horizontally fixed on the upright post type valve support rod, a coupler type upper valve rod through hole is formed in the guide plate, and the coupler type upper valve rod is limited in the coupler type upper valve rod through hole; when the stop valve is closed, the electric drive nut is rotated clockwise, the coupling type upper valve rod and the valve rod connected with the coupling type upper valve rod move downwards along the axial direction, and when the valve is opened, the electric drive nut is rotated anticlockwise, the coupling type upper valve rod and the valve rod connected with the coupling type upper valve rod move downwards along the axial direction.

Furthermore, a sealing packing is arranged between the valve rod through hole and the valve rod, a sealing packing gland is fixed on the upper end face of the valve cover through bolts, the sealing packing is used for preventing fluid from leaking from the valve rod through hole, and the sealing packing gland is used for compressing the sealing packing to ensure the sealing effect of the sealing packing.

Further, the lower end face of the valve cover is clamped with the upper end face of the valve seat, and a first metal winding pad is arranged on the side wall of the clamping face of the valve cover; and a second metal winding pad is arranged on the outer wall of the first clamping table of the valve seat.

Furthermore, the primary valve core, the secondary valve core, the valve rod, the valve seat, the valve body, the valve cover, the bearing chamber, the upright post type valve supporting rod and the guide plate are all integrally formed and machined by forging and rolling round steel numerical control, raw materials are safe and reliable without air holes, machining sizes are more precise, parts of valves of the same specification and model can be universally exchanged, and no surfacing layer is arranged on a sealing surface, so that the possibility that welding materials are separated from base materials is eliminated.

The utility model has the advantages that: compared with the prior art, the utility model discloses a quick repair formula exempts from to brush two core stop valves convenient to change has following advantage: (1) the valve has reasonable structural design, not only solves the damage of the sealing of the valve core and the valve seat caused by impurities in the pipeline, but also solves the problem of valve internal leakage caused by improper operation or slight opening and impact damage when the valve is slightly opened in actual operation, and greatly prolongs the service life of the valve; (2) when the valve is overhauled, the valve does not need to be detached from the pipeline for maintenance, any other parts can be replaced at will as long as the valve body is not damaged, the valve can be opened and closed by electric driving and manual driving and starting, and the valve driving structure is convenient to mount and dismount; (3) the purchasing cost, the overhaul time, the maintenance cost and the consumption of energy resources and materials of a user are reduced, the social and economic benefits are greatly improved, and the national energy-saving and emission-reducing policy guidance is met.

Drawings

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

FIG. 2 is a schematic view of the valve body structure of the present invention;

fig. 3 is a schematic structural diagram of the assembled valve cover, packing and gland of the present invention;

fig. 4 is a schematic structural view of the valve seat of the present invention;

FIG. 5 is a schematic view of the valve seat sleeve structure of the present invention;

FIG. 6 is a schematic structural view of the first-stage valve element and the limiting disc after assembly;

FIG. 7 is a schematic view of the connection relationship between the second-stage valve element, the connection mechanism and the valve cover of the present invention;

wherein, 1 valve body, 101 water chamber, 102 fluid inlet channel, 103 fluid outlet channel, 104 transition clamping groove, 105 clamping edge, 2 bolt, 3 valve cover, 301 valve core containing cavity, 302 valve rod perforation, 4 valve seat, 401 valve seat perforation, 402 valve seat first-level sealing surface, 403 valve seat second-level sealing surface, 404 first clamping table, 405 second clamping table, 5 valve seat sleeve, 501 sleeve perforation, 502 fluid perforation, 6 first-level valve core, 601 first-level valve core sealing surface, 602 containing groove, 7 second-level valve core, 701 second-level valve core sealing surface, 8 limiting disc, containing through hole, 9 connecting mechanism, 901 first connecting rod, 902 second connecting rod, 10 valve driving mechanism, 1001 bearing chamber, 1002 bearing chamber universal base, 1003 upright column type valve support rod, 1004 shaft coupler type upper valve rod, 1005 guide plate, 1006 thrust bearing, 1007 electric type driving nut, 11 valve rod, 12 sealing filler, 13 sealing filler gland, 1005, 14 first metal wound pad, 15 first metal wound pad.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.

In the embodiment shown in fig. 1-7, a quick-repair type non-flushing double-core stop valve convenient for replacement comprises a valve body 1 and a valve cover 3 mounted on the upper end of the valve body 1 through bolts 2, wherein the valve body 1 comprises a water chamber 101, a fluid inlet channel 102 and a fluid outlet channel 103, the middle upper part of the water chamber 101 of the valve body 1 is wide, the middle lower part is narrow, the middle part is provided with a transition clamping groove 104, the valve body is of a straight-through structure with high inlet and low outlet, a fluid inlet channel 102 is inclined from bottom to top, the fluid outlet channel 103 is inclined from bottom to top and is communicated with the middle lower part of the water chamber 101, the valve seat 4 and the valve seat sleeve 5 are sequentially installed inside the water chamber 101 from bottom to top, the lower end of the outer wall of the valve seat 4 is clamped with the transition clamping groove 104 of the water chamber 101, the upper end of the outer wall of the valve seat 4 is clamped with the valve seat sleeve 5, and the upper end of the valve seat sleeve 5 is extruded and fixed through the valve cover 3; the valve seat 4 is provided with a valve seat through hole 401 along the axial direction, the middle lower part of the inner wall of the valve seat through hole 401 is provided with a valve seat primary sealing surface 402 in an inverted circular truncated cone shape, and the top of the valve seat through hole 401 is provided with a valve seat secondary sealing surface 403 in an inverted circular truncated cone shape; the valve seat sleeve 5 is provided with a sleeve perforation 501 along the axial direction, the middle part of the valve seat sleeve 5 is provided with a horizontal fluid perforation 502, fluid enters from the fluid inlet channel 102, rises along the outer wall of the valve seat 4 and the outer wall of the valve seat sleeve 5 in the water chamber 101 and enters the fluid perforation 502, enters the valve seat perforation 401 from the fluid perforation 502 and is finally discharged from the fluid outlet channel 103 communicated with the middle lower part of the water chamber 101; a primary valve core 6 is arranged in a valve seat through hole 401 of the valve seat 4, a primary valve core sealing surface 601 in an inverted round table shape is arranged at the lower end of the primary valve core 6, the primary valve core sealing surface 601 is matched with the primary valve seat sealing surface 402, and the height of the primary valve core sealing surface 601 is larger than that of the primary valve seat sealing surface 402; a secondary valve core 7 is arranged in the valve seat sleeve 5, a secondary valve core sealing surface 701 in an inverted round table shape is arranged at the lower end of the secondary valve core 7, the secondary valve core sealing surface 701 is matched with the secondary valve seat sealing surface 403, and the height of the secondary valve core sealing surface 701 is larger than that of the secondary valve seat sealing surface 403; the upper end of the secondary valve core 7 is fixedly connected with the valve rod 11, the lower end of the secondary valve core 7 is connected with the primary valve core 6 through a connecting mechanism 9, and the connecting mechanism 9 enables a free stroke to exist between the primary valve core 6 and the secondary valve core 7; the valve cover 3 is provided with a valve core accommodating cavity 301 and a valve rod through hole 302 from bottom to top along the axis, the valve core accommodating cavity 301 is communicated with the sleeve through hole 501, the upper end of the valve rod 11 penetrates out of the valve rod through hole 302 and then is driven by a valve driving mechanism 10, the driving mechanism drives the valve rod 11 to move up or down, when the valve rod 11 moves down, the first-stage valve core sealing surface 601 and the first-stage valve seat sealing surface 402 firstly realize abutting sealing, and then the second-stage valve core sealing surface 701 and the second-stage valve seat sealing surface 403 abut sealing; in the opening and closing processes of the stop valve, the primary valve element 6 and the secondary valve element 7 move vertically, when the stop valve is closed, the primary valve element sealing surface 601 of the primary valve element 6 is in first contact sealing with the primary sealing surface 402 of the valve seat and is in a primary sealing state, at the moment, the secondary valve element sealing surface 701 is not in contact with the secondary sealing surface 403 of the valve seat, the pipeline fluid is in a static state, and the stop valve reaches a closed state, so that impurities in the pipeline do not move and damage the secondary valve element sealing surface 701, the closing operation is continued, the secondary valve element sealing surface 701 is in contact sealing with the secondary sealing surface 403 of the valve seat, and at the moment; in the opening process of the stop valve, the primary valve core 6 and the secondary valve core 7 are lifted from bottom to top, the sealing surface 701 of the secondary valve core is firstly separated from the sealing surface 403 of the secondary valve seat, the sealing surface 601 of the primary valve core is still in a contact sealing state with the sealing surface 402 of the primary valve seat, fluid in a pipeline does not flow, the valve opening operation is continued, the separation distance between the sealing surface 701 of the secondary valve and the sealing surface 403 of the secondary valve seat is gradually increased, the sealing surface 601 of the primary valve core is gradually separated from the sealing surface 402 of the primary valve seat, when the sealing surface 601 of the primary valve core is just separated from the sealing surface 402 of the primary valve seat, the stop valve is in a slightly opened state, the distance between the sealing surface 701 of the secondary valve and.

In this embodiment, the primary valve element 6 is provided with an accommodating groove 602 from the upper end surface downward along the axial direction; the connecting mechanism 9 for connecting the primary valve core 6 and the secondary valve core 7 comprises a limiting disc 8, a first connecting rod 901 and a second connecting rod 902, the upper end surface of the primary valve core 6 is coaxially provided with the limiting disc 8, the limiting disc 8 and the primary valve core 6 are fixedly connected through bolts, the limiting disc 8 is provided with an accommodating through hole 801 from the upper end surface downwards along the axial direction, the diameter of the accommodating through hole 801 is smaller than that of the accommodating groove 602, the diameter of the first connecting rod 901 is matched with that of the accommodating through hole 801, the diameter of the second connecting rod 902 is matched with that of the accommodating groove 602, the length of the second connecting rod 902 is smaller than the depth of the accommodating groove 602, the structural arrangement mode of the connecting mechanism 9 is matched with that of the primary valve core 6 and the limiting disc 8, the free stroke is arranged in the primary valve core 6, and the position of the primary valve core 6 can be automatically corrected under the action of fluid pressure; because the non-through accommodating groove 602 is formed in the primary valve core 6, and the length of the second connecting rod 902 is smaller than the depth of the accommodating groove 602, the secondary valve core 7 does not give downward thrust to the primary valve core 6 after being completely closed in place, and the influence of one valve core on the sealing performance of the other valve core is completely avoided.

In this embodiment, the main body of the valve seat 4 is a cylindrical structure, the lower end of the outer wall of the valve seat 4 is provided with a first clamping table 404 matched with the transition clamping groove 104 of the water chamber 101, and the upper end of the outer wall of the valve seat 4 is provided with a second clamping table 405 matched with the lower end of the valve seat sleeve 5.

In this embodiment, the valve seat through hole 401 of the valve seat 4 includes a first hole body, a second hole body, a third hole body and a fourth hole body that are sequentially connected from bottom to top, the first hole body, the second hole body and the fourth hole body are cylindrical holes, the third hole body is a circular truncated cone-shaped hole, the diameter of the second hole body is larger than that of the fourth hole body and is larger than that of the first hole body, the valve seat first-level sealing surface 402 is a transition surface of the first hole body and the second hole body, and the valve seat second-level sealing surface 403 is opened at the top end of the fourth hole body.

In this embodiment, hydroecium 101 upper end of valve body 1 is provided with the round card along 105, the card matches along 105 internal diameter and valve seat sleeve 5's upper end external diameter, valve seat sleeve 5's upper end is spacing in card along 105 and through valve gap 3 spacing fixed, valve seat sleeve 5 and valve seat 4 joint installation are fixed between the transition draw-in groove 104 of terminal surface and valve seat 1 under valve gap 3 through valve gap 3 extrusion, the position is stable, when local damage appears in valve seat 4 or valve seat sleeve 5, only need pull down valve gap 3 and take out valve seat sleeve 5 and valve seat 4 maintenance change can, it is convenient to overhaul, do not need whole maintenance or change whole valve body, and the cost is saved.

In this embodiment, the valve driving mechanism 10 is an electric type, a manual type, or a pneumatic type, which are all the prior art, and according to the use requirement, the original valve driving mechanism 10 can be conveniently detached and replaced with a new valve driving mechanism.

In this embodiment, the electric valve driving mechanism includes a bearing chamber 1001, a general base 1002 for the bearing chamber, a column-type valve support 1003, a coupling-type upper valve rod 1004, a guide plate 1005, thrust bearings 1006, and an electric drive nut 1007, the general base 1002 for the bearing chamber is connected to the upper end surface of the valve body 1 through the column-type valve support 1003, the bearing chamber 1001 is installed at the upper end of the general base 1002 for the bearing chamber, two thrust bearings 1006 are installed in the bearing chamber 1001, the electric drive nut 1007 is installed in cooperation with the thrust bearings 1006, a T-shaped thread is installed at the upper end of the coupling-type upper valve rod 1004, the electric drive nut 1007 is connected to the T-shaped thread of the coupling-type upper valve rod 1004, the lower end of the coupling-type upper valve rod 1004 is a coupling, an external thread is installed at the upper end of the valve rod 11, a load nut is installed on the external thread at the upper end, the load nut is limited and fixed through a back cap at the lower end of the coupler, a guide plate 1005 is horizontally fixed on the upright post type valve support rod 1003, a coupler type upper valve rod through hole is formed in the guide plate 1005, and the coupler type upper valve rod 1004 is limited in the coupler type upper valve rod through hole; the coupling-type upper stem 1004 and the stem 11 connected thereto are moved downward in the axial direction by rotating the electric drive nut 1007 clockwise at the time of the stop valve closing operation, and the coupling-type upper stem 1004 and the stem 11 connected thereto are moved downward in the axial direction by rotating the electric drive nut 1007 counterclockwise at the time of the stop valve opening operation.

In this embodiment, a sealing packing 12 is disposed between the stem penetration hole 302 and the stem 11, a sealing packing gland 13 is fixed to the upper end surface of the bonnet 3 by a bolt, the sealing packing 12 is used to prevent fluid from leaking from the stem penetration hole 302, and the sealing packing gland 13 is used to compress the sealing packing 12, thereby ensuring the sealing effect of the sealing packing.

In this embodiment, the lower end surface of the valve cover 3 is clamped with the upper end surface of the valve seat 1, and the clamping surface side wall of the valve cover 3 is provided with a first metal winding pad 14; a second metal winding pad 15 is arranged on the outer wall of the first clamping table 404 of the valve seat 4.

In this embodiment, the primary valve element 6, the secondary valve element 7, the valve rod 11, the valve seat 4, the valve body 1, the valve cover 3, the bearing chamber 1001, the upright type valve supporting rod 1003 and the guide plate 1005 are all integrally formed by forging and rolling round steel numerical control, raw materials are safe and reliable without pores, machining sizes are more precise, parts of valves of the same specification and model can be exchanged universally, and no surfacing layer on a sealing surface does not have the possibility that welding materials are separated from base materials.

The working principle is as follows: the utility model discloses a quick-repair type non-flushing double-core stop valve convenient to change, the stop valve is in opening and closing, the sub-assembly that first grade case 6, spacing dish 8 and second grade case 7 formed is vertical motion, the free stroke that sets up in the first grade case 6 can make first grade case 6 carry out position automatic correction under the effect of fluid pressure, when the stop valve is closing, first grade case sealing face 601 and valve seat first grade sealing face 402 of first grade case 6 contact the sealing first grade, be the first grade encapsulated situation, second grade case sealing face 701 and valve seat second grade sealing face 403 have not contacted at this moment, the pipeline fluid is in the quiescent condition, the stop valve has reached the closed condition, therefore impurity in the pipeline does not move, can not press and damage second grade case sealing face 701, continue to close the operation, make second grade case sealing face 701 and valve seat second grade sealing face 403 contact the sealing face and seal, be, because the non-through accommodating groove 602 is formed in the primary valve core 6, and the length of the second connecting rod 902 is smaller than the depth of the accommodating groove 602, the secondary valve core 7 cannot give downward thrust to the primary valve core 6 after being completely closed in place, and the influence of one valve core on the sealing property of the other valve core is completely avoided; in the opening process of the stop valve, the primary valve core 6 and the secondary valve core 7 are lifted from bottom to top, the sealing surface 701 of the secondary valve core is firstly separated from the sealing surface 403 of the secondary valve seat, the sealing surface 601 of the primary valve core is still in a contact sealing state with the sealing surface 402 of the primary valve seat, fluid in the pipeline does not flow, the valve opening operation is continued, after the idle stroke in the primary valve core 6 is finished, the connecting mechanism 9 can drive the primary valve core 6 and the limiting disc 8 to be lifted upwards together, the separation distance between the sealing surface 701 of the secondary valve and the sealing surface 403 of the secondary valve seat is gradually enlarged, the sealing surface 601 of the primary valve core is gradually separated from the sealing surface 402 of the primary valve seat, the stop valve is in a slightly opened state when the sealing surface 601 of the primary valve core is just separated from the sealing surface 402 of, the integrity of the secondary spool sealing surface 701 is guaranteed to the greatest extent possible.

The utility model discloses a fast repair formula exempts from to brush two core stop valves convenient to change, valve body 1 and valve gap 3 are joint and bolted connection, gland 13 is bolted connection with valve gap 3, valve actuating mechanism 10 is bolted connection with valve body 1, valve body 1 and disk seat 4 and disk seat sleeve 5 are joint and extrusion spacing fixed in proper order, spacing dish 8 and one-level case 6 bolted connection, one-level case 6 and second grade case 7 are detachable connections, valve rod 1004 is threaded connection on valve rod 11 and the shaft coupling type, can dismantle in a flexible way between each component, the maintenance of being convenient for is changed.

The above embodiments are only specific cases of the present invention, and the protection scope of the present invention includes but is not limited to the forms and styles of the above embodiments, and any suitable changes or modifications made thereto by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a quick-repair formula exempts from to brush two core stop valves convenient to change, includes the valve body and installs the valve gap in the valve body upper end, and the valve body includes hydroecium, fluid inlet passageway and fluid outlet passageway, its characterized in that: the middle upper part of the water chamber of the valve body is wide, the middle lower part of the water chamber is narrow, the middle part of the water chamber is provided with a transition clamping groove, a fluid inlet channel is communicated with the middle upper part of the water chamber, a fluid outlet channel is communicated with the middle lower part of the water chamber, a valve seat and a valve seat sleeve are sequentially arranged in the water chamber from bottom to top, the lower end of the outer wall of the valve seat is clamped with the transition clamping groove of the water chamber, the upper end of the outer wall of the valve seat is clamped; the valve seat is provided with a valve seat through hole along the axial direction, the middle lower part of the inner wall of the valve seat through hole is provided with a valve seat primary sealing surface in an inverted circular truncated cone shape, and the top of the valve seat through hole is provided with a valve seat secondary sealing surface in an inverted circular truncated cone shape; the valve seat sleeve is provided with a sleeve through hole along the axial direction, and the middle part of the valve seat sleeve is provided with a horizontal fluid through hole; a primary valve core is arranged in the valve seat through hole of the valve seat, a primary valve core sealing surface in an inverted round table shape is arranged at the lower end of the primary valve core, the primary valve core sealing surface is matched with the primary sealing surface of the valve seat, and the height of the primary valve core sealing surface is greater than that of the primary sealing surface of the valve seat; a secondary valve core is arranged in the valve seat sleeve, a secondary valve core sealing surface in an inverted round table shape is arranged at the lower end of the secondary valve core, the secondary valve core sealing surface is matched with the secondary valve seat sealing surface, and the height of the secondary valve core sealing surface is greater than that of the secondary valve seat sealing surface; the upper end of the secondary valve core is fixedly connected with the valve rod, the lower end of the secondary valve core is connected with the primary valve core through a connecting mechanism, and the connecting mechanism enables a free stroke to exist between the primary valve core and the secondary valve core; the valve cover is provided with a valve core accommodating cavity and a valve rod perforation from bottom to top along the axis, the valve core accommodating cavity is communicated with the sleeve perforation, the upper end of the valve rod is driven by a valve driving mechanism after penetrating out of the valve rod perforation, the valve driving mechanism drives the valve rod to move upwards or downwards, when the valve rod moves downwards, the first-stage valve core sealing surface and the first-stage valve seat sealing surface are firstly in abutting seal, and then the second-stage valve core sealing surface and the second-stage valve seat sealing surface are in abutting.

2. The quick-repair type flushing-free double-core stop valve convenient to replace according to claim 1, characterized in that: the primary valve core is provided with a containing groove from the upper end surface to the lower part along the axial direction.

3. The quick-repair type flushing-free double-core stop valve convenient to replace according to claim 2, characterized in that: a coupling mechanism for connecting one-level case and second grade case includes spacing dish, head rod and second connecting rod, spacing dish coaxial arrangement is in the up end of one-level case, spacing dish and one-level case pass through bolt fixed connection, the holding through-hole has been seted up by the up end downwards to spacing dish along the axial, the diameter of holding through-hole is less than the diameter of holding recess, the diameter of first connecting rod cooperatees with the diameter of holding through-hole, the diameter of second connecting rod cooperatees with the diameter of holding recess, the length of second connecting rod is less than the degree of depth of holding recess.

4. The quick-repair type flushing-free double-core stop valve convenient to replace according to claim 1, characterized in that: the main part of disk seat is cylindrical structure, and the outer wall lower extreme of disk seat is provided with the first card platform with the transition draw-in groove matched with of hydroecium, and the outer wall upper end of disk seat is provided with the second card platform with the telescopic lower extreme matched with of disk seat.

5. The quick-repair type flushing-free double-core stop valve convenient to replace according to claim 1, characterized in that: the valve seat perforation of the valve seat comprises a first hole body, a second hole body, a third hole body and a fourth hole body which are sequentially connected from bottom to top, wherein the first hole body, the second hole body and the fourth hole body are cylindrical holes, the third hole body is a circular truncated cone-shaped hole, the diameter of the second hole body is larger than that of the fourth hole body and larger than that of the first hole body, a valve seat first-level sealing surface is a transition surface of the first hole body and the second hole body, and a valve seat second-level sealing surface is arranged at the top end of the fourth hole body.

6. The quick-repair type flushing-free double-core stop valve convenient to replace according to claim 1, characterized in that: the upper end of the water chamber of the valve body is provided with a circle of clamping edge, the inner diameter of the clamping edge is matched with the outer diameter of the upper end of the valve seat sleeve, and the upper end of the valve seat sleeve is limited in the clamping edge and is limited and fixed through the valve cover.

7. The quick-repair type flushing-free double-core stop valve convenient to replace according to claim 1, characterized in that: the valve driving mechanism is electrically driven, manually driven or pneumatically driven.

8. The quick-repair, wash-free and double-core stop valve convenient to replace of claim 7, wherein: the electric valve driving mechanism comprises a bearing chamber, thrust bearings, an electric driving nut, a universal base of the bearing chamber, a column-shaped valve support rod, a coupling-type upper valve rod and a guide plate, wherein the universal base of the bearing chamber is connected with the upper end surface of the valve body through the column-shaped valve support rod, the upper end of the universal base of the bearing chamber is provided with the bearing chamber, the bearing chamber is internally provided with two thrust bearings, the electric driving nut is matched with the thrust bearings for installation, the upper end of the coupling-type upper valve rod is provided with T-shaped threads, the electric driving nut is connected with the T-shaped threads of the coupling-type upper valve rod, the lower end of the coupling-type upper valve rod is a coupling, the upper end of the valve rod is provided with external threads, the external threads of the upper end of a valve cover are assembled with a load nut, the upper end of the valve rod is arranged in the coupling, the, the guide plate is provided with a coupler type upper valve rod through hole, and the coupler type upper valve rod is limited in the coupler type upper valve rod through hole.

9. The quick-repair type flushing-free double-core stop valve convenient to replace according to claim 1, characterized in that: and a sealing packing is arranged between the valve rod through hole and the valve rod, and a sealing packing gland is fixed on the upper end surface of the valve cover through a bolt.

10. The quick-repair type flushing-free double-core stop valve convenient to replace according to claim 1, characterized in that: the lower end face of the valve cover is clamped with the upper end face of the valve seat, and a first metal winding pad is arranged on the side wall of the clamping face of the valve cover; and a second metal winding pad is arranged on the outer wall of the first clamping table of the valve seat.