CN109751431A - Dual-valve body bridge cut-off core pipe valve - Google Patents

Abstract

Dual-valve body bridge cut-off core pipe valve of the invention, the valve core tube for being wrapped in outer valve inner cavity are the coaxial sleeve II through the sleeve I of valve body, body cavity and valve body of fixing piece；There is axial interlayer in the middle part of valve core tube, the axial both sides of interlayer are concentric input section and deferent segment respectively, and deferent segment and interlayer are detached from, and input section has at least one radial recirculation hole；The chamber portion of body cavity is half, the entity part of another half have the duct of hollow out from I annular inner wall of sleeve radially into, turn round it is axial flow into inner cavity, the recirculation hole of the input section of radial bore and pairing matches；Sealing pair is constituted around the annular spool of interlayer and the ring-shaped valve seats of sleeve II；Input section outer diameter is greater than deferent segment outer diameter, input section and sleeve I and deferent segment and sleeve II is that shaft hole mode cooperates its engaging portion to be respectively provided with sealing；The driving element that the setting of valve body outer end keeps valve body axial reciprocating mobile.It can effectively seal and prevent medium to sealing pair erosion and abrasion.

Description

Dual-valve body bridge cut-off core pipe valve

Technical field

Dual-valve body bridge cut-off core pipe valve of the invention belongs to valve field, is core pipe valve (the patent Shen of my original invention Please dual-valve body core pipe valve (201810269121.4) plate in number 201810267863.3) maternal column a series of branches； Suitable for generic media, the high abrasive media, corrosive media, the inflammable and explosive medium, poisonous and harmful Jie that are more suitable under high pressure operating condition Matter, nuclear energy medium；Function is related to opening and closing, pressure opening and closing, adjusting, throttling, decompression, safety, non-return, emergency cut-off and two-way booster Emergency cut-off；Its structural advantage is characteristic of the sealing pair at work with the erosion and the abrasion that avoid high pressure in opening-closing process, with And zero leakage characteristic.

Background technique

Currently, various valves, at work and in opening-closing process, sealing pair will receive the erosion and abrasion of medium, it is special It is not Parallel Slide Valves, LNG valve, nuclear power valve etc..

Summary of the invention

The object of the present invention is to provide dual-valve body bridge cut-off core pipe valve, high pressure when reducing and avoid in work and opening and closing Erosion and abrasion of the medium flow field to sealing pair, meet the needs of production, and improve reliability, safety and the duration of valve.

Dual-valve body bridge cut-off core pipe valve is mainly technically characterized by: the valve core tube for being wrapped in outer valve inner cavity is connection pressure Force container, press device, medium pipe network the coaxial sleeve through the sleeve I of valve body, body cavity and valve body of fixing piece Pipe II；There is axial interlayer in the middle part of valve core tube, interlayer is made of the intermediate pipeline section of the valve core tube of kernel and kernel radial radiation；Interlayer Axial both sides be concentric input section and deferent segment respectively, deferent segment and interlayer are detached from and have distance, and be connected phase with interlayer Adjacent input section has at least one radial recirculation hole；The chamber portion of body cavity is half, and another half entity part has hollow out Duct from I annular inner wall of sleeve radially into then, turning round axial flows into inner cavity, Cheng " ╗ " shape, radial bore and pairing The recirculation hole of input section corresponding match；It constitutes and seals around the annular spool of interlayer and the ring-shaped valve seats of II throat of sleeve It is secondary；The outer diameter of input section is greater than the outer diameter of deferent segment, input section and sleeve I and deferent segment and sleeve II is that shaft hole mode cooperates its knot Conjunction portion is respectively provided with sealing；Outer valve and the axially opposing valve end answered are passed through in the axial any end setting valve rod of outer valve Connection；Under the action of both direction potential energy, valve body makees axial reciprocating movement relative to valve core tube.

The technical characteristics of dual-valve body bridge cut-off core pipe valve can also be: the valve core tube for being wrapped in outer valve inner cavity is Connect coaxial sleeve I, body cavity, the Yi Jifa through valve body of fixing piece of pressure vessel, press device, medium pipe network The sleeve II of body；Have axial interlayer in the middle part of valve core tube, interlayer by the valve core tube of kernel and kernel radial radiation intermediate pipeline section structure At；The axial both sides of interlayer are concentric input section and deferent segment respectively, and deferent segment and interlayer are detached from and have distance, with interlayer The adjacent input section that is connected has at least one radial recirculation hole；The chamber portion of body cavity is half, another half entity part Have the duct of hollow out from I annular inner wall of sleeve radially into then, turning round axial flows into inner cavity, Cheng " ╗ " shape, radial bore It is corresponding with the recirculation hole of the input section of pairing to match；Around the annular spool of interlayer and the ring-shaped valve seats structure of II throat of sleeve At sealing pair；The outer diameter of input section is greater than the outer diameter of deferent segment, and input section is matched with sleeve I and deferent segment with sleeve II for shaft hole mode It closes its engaging portion and is respectively provided with sealing；At least one sleeve end face of sleeve I and sleeve II and the axially opposing outer valve inner end answered Ripple blind pipe is set between face, and ripple blind pipe penetrates through driving pressure by communicating pipe；Under the action of both direction potential energy, valve body It is mobile to make axial reciprocating relative to valve core tube.

The technical characteristics of dual-valve body bridge cut-off core pipe valve may also is that the valve core tube for being wrapped in outer valve inner cavity is Connect coaxial sleeve I, body cavity, the Yi Jifa through valve body of fixing piece of pressure vessel, press device, medium pipe network The sleeve II of body；Have axial interlayer in the middle part of valve core tube, interlayer by the valve core tube of kernel and kernel radial radiation intermediate pipeline section structure At；The axial both sides of interlayer are concentric input section and deferent segment respectively, and deferent segment and interlayer are detached from and have distance, with interlayer The adjacent input section that is connected has at least one radial recirculation hole；The chamber portion of body cavity is half, another half entity part Have the duct of hollow out from I annular inner wall of sleeve radially into then, turning round axial flows into inner cavity, Cheng " ╗ " shape, radial bore It is corresponding with the recirculation hole of the input section of pairing to match；Around the annular spool of interlayer and the ring-shaped valve seats structure of II throat of sleeve At sealing pair；The outer diameter of input section is greater than the outer diameter of deferent segment, and input section is matched with sleeve I and deferent segment with sleeve II for shaft hole mode It closes its engaging portion and is respectively provided with sealing；One communicating pipe is corresponding with I end of sleeve across outer valve through-hole and inner cavity penetrates through；One Root communicating pipe is corresponding with II end of sleeve across outer valve through-hole and inner cavity penetrates through；Under the action of both direction potential energy, valve Body makees axial reciprocating movement relative to valve core tube.

Setting compression bullet between one of sleeve end face of the sleeve I and sleeve II and corresponding outer valve end face Spring.

The interlayer is made of the intermediate pipeline section of the valve core tube of kernel and kernel radial radiation, and interlayer and input section are one , it is also possible to two parts of interlayer and input section and is formed by welding.

The axial rearward end face of the interlayer kernel is taper slope surface.

The ring-shaped valve seats of insertion II throat of sleeve is axially concaved II throat of sleeve.

The input section and the wherein at least one of deferent segment and outer valve are one.

A radial check-valves is arranged in the input section ring wall, penetrates through when valve is closed with duct.

Bellows seal is arranged in the engaging portion of the input section and sleeve I, and bellows seal inner cavity passes through input section The preceding pressure perforation of the intercommunicating pore and valve of ring wall；Bellows seal, sylphon seal is arranged in the engaging portion of deferent segment and sleeve II The rear pressure perforation that part passes through the intercommunicating pore and valve of deferent segment ring wall.

The engaging portion of the input section and sleeve I and deferent segment and sleeve II is respectively provided with bellows seal and sealing ring； The inner cavity of two bellows seals is penetrated through by communicating pipe.

In conclusion dual-valve body bridge cut-off core pipe valve of the invention has the active effect that

1, structure is simple, convenient for manufacture；

2, ring packing valve seat and annular spool are axial straight contacts, are not rubbed, and sealing effect is good；

3, long service life, cost performance are high；

4, harsh operating condition is adapted to；

5, valve body is turned off formula to medium flow field as opening and closing element when closing valve, and opening and closing resistance is small；

Even if operability can be still good 6, under high-pressure medium state；

No matter 7, opening or closing, high-pressure medium will not be to the by-produced erosion of sealing and abrasion.

Detailed description of the invention

Attached drawing 1,2 is longitudinal complete section face structural representation two states figure of first embodiment of the invention.

Attached drawing 3 is a kind of state diagram of longitudinal complete section face structural representation of second embodiment of the invention.

Attached drawing 4 is a kind of state diagram of longitudinal complete section face structural representation of third embodiment of the invention.

Attached drawing 5,6 is longitudinal complete section face structural representation two states figure of four embodiment of the invention.

Attached drawing 7,8 is longitudinal complete section face structural representation two states figure of fifth embodiment of the invention.

Attached drawing 9,10,11,12 is four kinds of state diagrams of longitudinal complete section face structural representation of sixth embodiment of the invention.

Attached drawing 13,14 is longitudinal complete section face structural representation two states figure of seventh embodiment of the invention.

Attached drawing 15,16 is longitudinal complete section face structural representation two states figure of eighth embodiment of the invention.

Attached drawing 17,18 is longitudinal complete section face structural representation two states figure of ninth embodiment of the invention.

Attached drawing 19,20 is longitudinal complete section face structural representation two states figure of tenth embodiment of the invention.

Attached drawing 21,22,23,24 is four kinds of state diagrams of longitudinal complete section face structural representation of eleventh embodiment of the invention.

Attached drawing 25,26,27,28 is four kinds of state diagrams of longitudinal complete section face structural representation of twelveth embodiment of the invention.

Attached drawing 29,30 is longitudinal complete section face structural representation two states figure of thirteenth embodiment of the invention.

1- valve core tube, 1 '-input section, 1 in figure "-deferent segment, 100- interlayer, 100 '-ligulate triangle slope surfaces 100 ', 101- annular spool, 103- recirculation hole, 105 "-intercommunicating pore, 2- valve body, 2 '-sleeves I, 2 "-sleeves II, the inner cavity 200-, 200 "-duct, 201- ring-shaped valve seats, 300- bellows seal, 302- sealing ring, 305- ring-shaped sealing sleeve, 308- ripple are blind Pipe, 4- compressed spring, 504- valve rod, 504 '-valve rod bases, 504 "-bolt, 507- motor, 600- communicating pipe, 601- communicating pipe, 602- communicating pipe, 603- triple valve, 605- control valve, 606- control valve, 608- check-valves, 707- ball, 8- outer valve, 8 '- Inner cavity, 804- sealing-plug.

Specific embodiment

Embodiment summary:

The valve core tube 1 for being wrapped in 8 inner cavity 8 ' of outer valve be the coaxial sleeve I 2 through valve body 2 of fixing piece ', valve 2 inner cavity 200 of body and valve body 2 sleeve II 2 "；There is axial interlayer 100 in the middle part of valve core tube 1, interlayer 100 is by kernel and kernel diameter It is constituted to the intermediate pipeline section of the valve core tube 1 of radiation；The axial both sides of interlayer 100 are concentric input section 1 ' and deferent segment respectively 1 ", it is round and smooth slope surface that deferent segment 1, which " is detached from interlayer 100 and has distance, deferent segment 1 " nozzle corresponding with interlayer 100, with The adjacent input section 1 ' that is connected of interlayer 100 has at least one radial recirculation hole 103；The chamber portion of 2 inner cavity 200 of valve body is half It cuts, another half entity part has the duct 200 of hollow out " from I 2 ' annular inner wall of sleeve radially into then, turn is axial to be flowed into Inner cavity 200, Cheng " ╗ " shape, radial bore is corresponding with the recirculation hole 103 of the input section 1 ' of pairing to match；Around interlayer The sealing surface of 100 annular spool 101 is unidirectional slope surface and sleeve II 2, and " ring-shaped valve seats 201 of throat constitutes sealing pair, sleeve II 2 " the recessed sleeve II 2 of ring-shaped valve seats 201 of throat " throats, it is possible to reduce the erosion to ring-shaped valve seats 201；Input section 1 ' Outer diameter is greater than deferent segment 1 " outer diameter, input section 1 ' and sleeve I 2 ' and deferent segment 1 " with sleeve II 2 " for shaft hole mode cooperate its two A engaging portion is respectively provided with sealing.

Embodiment one

Referring to attached drawing 1,2, dual-valve body bridge cut-off core pipe valve described in the present embodiment is especially denuded for high for opening and closing The opening and closing of medium such as slurries；The axial forward end face of 100 kernel of interlayer is ligulate triangle slope surface 100 ', and axial rearward end face is cone Shape slope surface；The end cap of input section 1 ' and outer valve 8 is one, and deferent segment 1 " is fixedly connected with outer valve 8；There are two input sections 1 ' The recirculation hole 103 of radial rake " matches with the duct 200 of valve body 2；Input section 1 ' and sleeve I 2 ' and deferent segment 1 " and sleeve II 2 " engaging portion is respectively provided with sealing ring 302；A piece valve rod 504 passes through 8 through-hole of outer valve and is fixedly connected with I 2 ' end of sleeve； Bellows seal 300 is set between I 2 ' end face of sleeve and axially opposing 8 inner face of outer valve answered and wraps up valve rod 504, valve rod 504 middle parts have the radial through-hole of a positioning " to match with bolt 504.

It shown in attached drawing 1, is in off state, pulls out valve rod 504, keep valve body 2 mobile to 1 ' direction of input section, closing In the process, when being moved across 103 aperture length of recirculation hole of input section 1 ', I 2 ' annular inner wall of sleeve covers input section 1 ' Recirculation hole 103；" ring-shaped valve seats 201 of throat is closely affixed sleeve II 2 with annular spool 101；Then, bolt 504 is plugged ".

Shown in attached drawing 2, it is open state, pulls out bolt 504 ", pushing valve rod 504, make valve body 2 to deferent segment 1, " direction is moved Dynamic, " ring-shaped valve seats 201 of throat leaves annular spool 101 to sleeve II 2, and medium flows into duct through the recirculation hole 103 of input section 1 ' 200 ", inner cavity 200, deferent segment 1 ", into the rear pressure of valve.

Embodiment two

Referring to attached drawing 3, dual-valve body bridge cut-off core pipe valve described in the present embodiment is especially used for toxic for opening and closing, adjusting The opening and closing and adjusting of harmful, inflammable and explosive medium such as LNG medium；The interlayer 100 and input section 1 ' be two part welding and At；The axial forward end face of 100 kernel of interlayer is spherical surface, and axial rearward end face is taper slope surface；" the end cap with outer valve 8 of deferent segment 1 It is one, input section 1 ' is fixedly connected with outer valve 8；Input section 1 ' is there are four radial recirculation hole 103, the duct with valve body 2 200 " match；The engaging portion of input section 1 ' and sleeve I 2 ' and deferent segment 1 " with sleeve II 2 " is respectively provided with bellows seal 300；Piece valve rod 504 passes through 8 through-hole of outer valve and is attached to the sealing ring 302 of through-hole and connect with I 2 ' end convolution of sleeve；It is defeated Enter 1 ' ring wall of section and one radial check-valves 608 is set, " perforation, prevents under air-tight state with duct 200 when valve is closed Media expansion is such as: LNG valve is converted to gaseous state by liquid；Valve rod 504 can be driven by motor；Traditional valve can not need to set Set check-valves 608.

It is open state shown in attached drawing 3, rotary valve rod 504 makes valve body 2 to deferent segment 1, and " direction is mobile, II 2 " larynx of sleeve The ring-shaped valve seats 201 in portion leaves annular spool 101, and medium flows into duct 200 through the recirculation hole 103 of input section 1 ' ", inner cavity 200, Deferent segment 1 ", into the rear pressure of valve.

When closing, rotary valve rod 504 keeps valve body 2 mobile to 1 ' direction of input section, when the circulation for being moved across input section 1 ' When 103 aperture length of hole, I 2 ' annular inner wall of sleeve covers the recirculation hole 103 of input section 1 '；" the ring-shaped valve seats of throat of sleeve II 2 201 are closely affixed with annular spool 101；At this point, " the perforation of check-valves 608 and duct 200.

Embodiment three

Referring to attached drawing 4, dual-valve body bridge cut-off core pipe valve described in the present embodiment is especially toxic to have for opening and closing and adjusting The opening and closing and adjusting of evil medium；The interlayer 100 is that two parts are welded with input section 1 '；The axial direction of 100 kernel of interlayer Front end face is ligulate triangle slope surface 100 ', and axial rearward end face is taper slope surface；Input section 1 ' and deferent segment 1 are " solid with outer valve 8 Fixed connection；Input section 1 ' " matches there are two the recirculation hole 103 of radial rake with the duct 200 of valve body 2；Input section 1 ' and sleeve The engaging portion of pipe I 2 ' and deferent segment 1 " with sleeve II 2 " is respectively provided with bellows seal 300；A piece valve rod 504 is threaded through outer The valve rod base 504 ' of valve body 8 is flexibly connected with I 2 ' end of sleeve, I 2 ' end face of sleeve and axially opposing 8 inner face of outer valve answered Between setting bellows seal 300 wrap up valve rod 504；Sleeve II 2 " end face and axially opposing 8 inner face of outer valve answered it Between be arranged compressed spring 4.

It is open state shown in attached drawing 4, screw propulsion valve rod 504 makes valve body 2 to deferent segment 1, and " direction is mobile, sleeve II 2 " ring-shaped valve seats 201 of throat leaves annular spool 101, and medium flows into duct 200 through 1 ' recirculation hole 103 of input section ", inner cavity 200, deferent segment 1 ", into the rear pressure of valve.

Example IV

Referring to attached drawing 5,6, dual-valve body bridge cut-off core pipe valve described in the present embodiment especially has for toxic for opening and closing The opening and closing of harmful, inflammable and explosive, nuclear energy medium such as LNG medium；The axial forward end face of 100 kernel of interlayer is spherical surface, after axial direction End face is taper slope surface；Deferent segment 1 " is integrated, input section 1 ' is fixedly connected with outer valve 8 with 8 end cap of outer valve；Input section 1 ' There are four radial recirculation holes 103, " match with the duct 200 of valve body 2；Input section 1 ' and sleeve I 2 ' and deferent segment 1 " and sleeve II 2 " engaging portion is respectively provided with bellows seal 300；A piece valve rod 504 passes through the valve rod base 504 ' and sleeve II of outer valve 8 2 " end is fixedly connected, and bellows seal 300 is arranged between 504 handle of valve rod and axially opposing 8 outer end face of outer valve answered Wrap up valve rod 504, the handle for having a fixed point that can be affiliated to valve rod 504 on the axis of valve rod 504；Sleeve II 2 " end face and axis To setting compressed spring 4 between corresponding 8 inner face of outer valve；1 ' ring wall of input section has radial communication hole 105 ", ditch port valve 300 inner cavity of preceding pressure and bellows seal, 1 ' ring wall of deferent segment has radial communication hole 105 ", the rear pressure and bellows of ditch port valve 300 inner cavity of sealing element；A radial check-valves 608 is arranged in 1 ' ring wall of input section, " passes through when valve is closed with duct 200 Logical, prevent under air-tight state media expansion such as: LNG valve is converted to gaseous state by liquid；Traditional valve, which can not need setting, to be stopped Return valve 608；It rolls and connects in the outer ring surface setting ball 707 and 8 inner ring surface of outer valve of valve body 2.

It is open state shown in attached drawing 5, pulls valve rod 504 and be affiliated to the handle of valve rod 504 in fixed point, make valve body 2 To deferent segment 1, " direction is mobile, sleeve II 2 " ring-shaped valve seats 201 of throat leaves annular spool 101, and medium is flowed through input section 1 ' Through-hole 103 flows into duct 200 ", inner cavity 200, deferent segment 1 ", into the rear pressure of valve.

It shown in attached drawing 6, is in off state, valve rod 504 is made to unclamp fixed point, compressed spring 4 pushes valve body 2 to input section 1 ' Direction is mobile, during the shutdown process, when being moved across 103 aperture length of recirculation hole of input section 1 ', I 2 ' annular inner wall of sleeve Cover the recirculation hole 103 of input section 1 '；" ring-shaped valve seats 201 of throat is closely affixed sleeve II 2 with annular spool 101.

Embodiment five

Referring to attached drawing 7,8, dual-valve body bridge cut-off core pipe valve described in the present embodiment is especially denuded for high for opening and closing The opening and closing of medium such as slurries；The axial forward end face of 100 kernel of interlayer is ligulate triangle slope surface 100 ', and axial rearward end face is cone Shape slope surface；" the both ends end cap with outer valve 8 is one for input section 1 ' and deferent segment 1；There are two the streams of radial rake for input section 1 ' Through-hole 103 " matches with the duct 200 of valve body 2；The engaging portion of input section 1 ' and sleeve I 2 ' and deferent segment 1 " with sleeve II 2 " It is respectively provided with sealing ring 302；A piece valve rod 504 passes through outer valve 8 and is fixedly connected with I 2 ' end of sleeve, I 2 ' end face of sleeve and axial direction Between corresponding 8 inner face of outer valve be arranged bellows seal 300 wrap up valve rod 504,504 end of valve rod with it is axially opposing Compressed spring 4 is set between 8 outer end face of outer valve answered and wraps up valve rod 504.

It is open state shown in attached drawing 7, pushing valve rod 504, make valve body 2 to deferent segment 1, " direction is mobile, II 2 " larynx of sleeve The ring-shaped valve seats 201 in portion leaves annular spool 101, and medium flows into duct 200 through the recirculation hole 103 of input section 1 ' ", inner cavity 200, Deferent segment 1 ", into the rear pressure of valve.

It shown in attached drawing 8, is in off state, exits valve rod 504, the elastic force of compressed spring 4 makes valve body 2 to 1 ' direction of input section Mobile, " ring-shaped valve seats 201 of throat is closely affixed sleeve II 2 with annular spool 101.

Embodiment six

Referring to attached drawing 9,10,11,12, dual-valve body bridge cut-off core pipe valve described in the present embodiment, for remotely controlling to adjust and Opening and closing is especially used for the opening and closing and adjusting of high abrasive media such as slurries；The axial forward end face of 100 kernel of interlayer is ligulate Triangle slope surface 100 ', axial rearward end face are taper slope surfaces；Deferent segment 1 " it is one with the end cap of outer valve 8, input section 1 ' and outer Valve body 8 is fixedly connected；Input section 1 ' " matches there are two the recirculation hole 103 of radial rake with the duct 200 of valve body 2；Input Section 1 ' and the engaging portion of sleeve I 2 ' and deferent segment 1 " with sleeve II 2 " are respectively provided with sealing ring 302；A piece valve rod 504 passes through outer valve It 8 through-hole of body and is attached to the sealing ring 302 of through-hole " end convolution is connect, and valve rod 504 is driven by motor 507 with sleeve II 2.

Being open state shown in attached drawing 9,507 driving stem 504 of motor makes valve body 2 to deferent segment 1, " direction is mobile, sleeve Pipe II 2 " ring-shaped valve seats 201 of throat leaves annular spool 101, and medium flows into duct 200 through the recirculation hole 103 of input section 1 ' ", Inner cavity 200, deferent segment 1 ", into the rear pressure of valve.

It is semi-open adjustment state shown in attached drawing 10,507 driving stem 504 of motor continues valve body 2 to deferent segment 1 " Direction is mobile, sleeve I 2 ' annular inner wall covered the major part of 1 ' recirculation hole 103 of input section, medium circulates through input section 1 ' Hole 103 flows into duct 200 ", inner cavity 200, deferent segment 1 ", and throttling, decompression enter the rear pressure of valve.

It is closed state shown in attached drawing 11,507 driving stem 504 of motor keeps valve body 2 mobile to 1 ' direction of input section, In closing process, when being moved across 103 aperture length of recirculation hole of input section 1 ', I 2 ' annular inner wall of sleeve covers input section 1 ' recirculation hole 103, meanwhile, still cover annular spool 101；Medium is prevented from flowing substantially.

It shown in attached drawing 12, is in off state, 507 driving stem 504 of motor, valve body 2 is made to continue to move to 1 ' direction of input section Dynamic, " ring-shaped valve seats 201 of throat is closely affixed sleeve II 2 with annular spool 101.

Embodiment seven

Referring to attached drawing 13,14, dual-valve body bridge cut-off core pipe valve described in the present embodiment, for high pressure opening and closing, safety and non-return, Especially for high pressure opening and closing, safety and the non-return of poisonous and harmful, inflammable and explosive, nuclear energy medium such as LNG medium；The interlayer The axial forward end face of 100 kernels is ligulate triangle slope surface 100 ', and axial rearward end face is taper slope surface；Deferent segment 1 is " with outer valve 8 End cap is integrated, and input section 1 ' is fixedly connected with outer valve 8；There are two the recirculation holes 103 of radial rake for input section 1 ', with valve body 2 duct 200 " matches；It is close that the engaging portion of input section 1 ' and sleeve I 2 ' and deferent segment 1 " with sleeve II 2 " is respectively provided with bellows Sealing 300；Ripple blind pipe 308, ripple blind pipe 308 are set between I 2 ' end face of sleeve and axially opposing 8 inner face of outer valve answered Inner cavity is connect with communicating pipe 600 and the perforation of the preceding pressure of valve；Sleeve II 2 is " between end face and axially opposing 8 inner face of outer valve answered Compressed spring 4 is set；1 ' ring wall of input section has radial communication hole 105 ", 300 inner cavity of preceding pressure and bellows seal of ditch port valve, 1 ' ring wall of deferent segment has radial communication hole 105 ", 300 inner cavity of rear pressure and bellows seal of ditch port valve；1 ' ring wall of input section is set Set a radial check-valves 608, when valve is closed with duct 200 " perforation prevents under air-tight state media expansion such as: LNG valve is converted to gaseous state by liquid；Traditional valve can not need setting check-valves 608.

It is opened and closed for high pressure:

It is open state shown in attached drawing 13, pressure medium has arrived rated pressure, the driving medium of 308 inner cavity of ripple blind pipe Pressure is greater than the elastic force of compressed spring 4, and pushing valve body 2 to deferent segment 1, " direction is mobile, " the ring-shaped valve seats 201 of throat of sleeve II 2 Leave annular spool 101, medium flows into duct 200 ", inner cavity 200, deferent segment 1 " through 1 ' recirculation hole 103 of input section, into valve After press.

It shown in attached drawing 14, is in off state, pressure medium is lower than rated pressure, the driving medium of 308 inner cavity of ripple blind pipe Pressure is less than the elastic force of compressed spring 4, and compressed spring 4 pushes valve body 2 mobile to 1 ' direction of input section, during the shutdown process, when When being moved across 103 aperture length of recirculation hole of input section 1 ', I 2 ' annular inner wall of sleeve covers the recirculation hole 103 of input section 1 '； " ring-shaped valve seats 201 of throat is closely affixed sleeve II 2 with annular spool 101.

For safety:

It is open state, the pressure medium superelevation of pipe network, the driving medium pressure of 308 inner cavity of ripple blind pipe shown in attached drawing 13 Power is higher than the elastic force of compressed spring 4, pushes valve body 2 to deferent segment 1 " direction is mobile, the sleeve II 2 " ring-shaped valve seats 201 of throat from Open annular spool 101, medium flows into duct 200 ", inner cavity 200, deferent segment 1 " through 1 ' recirculation hole 103 of input section, into after valve Pressure release.

It shown in attached drawing 14, is in off state, the pressure medium of pipe network is normal, the driving medium pressure of 308 inner cavity of ripple blind pipe Power is less than the elastic force of compressed spring 4, and compressed spring 4 pushes valve body 2 mobile to 1 ' direction of input section, during the shutdown process, works as shifting Dynamic when crossing 103 aperture length of recirculation hole of input section 1 ', I 2 ' annular inner wall of sleeve covers the recirculation hole 103 of input section 1 '；Sleeve " ring-shaped valve seats 201 of throat is closely affixed pipe II 2 with annular spool 101.

For non-return:

It is open state, the pressure medium of pipe network is normal, the driving medium pressure of 308 inner cavity of ripple blind pipe shown in attached drawing 13 Power is greater than the elastic force of compressed spring 4, pushes valve body 2 to deferent segment 1 " direction is mobile, the sleeve II 2 " ring-shaped valve seats 201 of throat from Open annular spool 101, medium flows into duct 200 ", inner cavity 200, deferent segment 1 " through 1 ' recirculation hole 103 of input section, into after valve Pressure.

It shown in attached drawing 14, is in off state, the pressure medium subnormal pressure of pipe network or loses pressure source, ripple is blind The driving pressure medium of 308 inner cavity of pipe is less than the elastic force of compressed spring 4, and compressed spring 4 pushes valve body 2 to move to 1 ' direction of input section Dynamic, during the shutdown process, when being moved across 103 aperture length of recirculation hole of input section 1 ', I 2 ' annular inner wall of sleeve covers defeated Enter the recirculation hole 103 of section 1 '；" ring-shaped valve seats 201 of throat is closely affixed sleeve II 2 with annular spool 101, realizes non-return.

Embodiment eight

Referring to attached drawing 15,16, dual-valve body bridge cut-off core pipe valve described in the present embodiment is especially ground for high for opening and closing Lose the opening and closing of medium such as slurries；The axial forward end face of 100 kernel of interlayer is ligulate triangle slope surface 100 ', and axial rearward end face is Taper slope surface；The end cap of input section 1 ' and outer valve 8 is one, and deferent segment 1 " is fixedly connected with outer valve 8；Input section 1 ' has two The recirculation hole 103 of a radial rake " matches with the duct 200 of valve body 2；Input section 1 ' and sleeve I 2 ' and deferent segment 1 are " with sleeve Pipe II 2 " engaging portion be respectively provided with sealing ring 302；It is opposite with I 2 ' end of sleeve that one communicating pipe 600 passes through 8 through-hole of outer valve It answers and inner cavity 8 ' penetrates through, control valve 605 is set in the middle part of communicating pipe 600；One communicating pipe 601 passes through 8 through-hole of outer valve and sleeve II 2 " end is corresponding and inner cavity 8 ' penetrates through, and control valve 606 is arranged in the middle part of communicating pipe 601；I 2 ' end of sleeve and sleeve II 2 " The ring-shaped sealing sleeve 305 of package valve core tube 1 is respectively set in end.

It shown in attached drawing 15, is in off state, closes control valve 605, open control valve 606, sleeve II 2 be " end side Inner cavity 8 ' pushes valve body 2 mobile to 1 ' direction of input section full of driving pressure medium, during the shutdown process, defeated when being moved across When entering 103 aperture length of recirculation hole of section 1 ', I 2 ' annular inner wall of sleeve covers the recirculation hole 103 of input section 1 '；II 2 " larynx of sleeve The ring-shaped valve seats 201 in portion is closely affixed with annular spool 101；The ring-shaped sealing sleeve 305 at both ends is closely affixed with valve core tube 1； Meanwhile seam of the driving medium of I 2 ' end of sleeve side inner cavity 8 ' between the outer ring surface of valve body 2 and the inner ring surface of outer valve 8 Clearance flow the enters sleeve II 2 " inner cavity 8 ' of end side.

Shown in attached drawing 16, be open state, close control valve 606, open control valve 605, I 2 ' end of sleeve side it is interior " direction is mobile, the sleeve II 2 " ring-shaped valve seats 201 of throat that pushes valve body 2 to deferent segment 1 full of driving pressure medium of chamber 8 ' from Open annular spool 101, medium flows into duct 200 ", inner cavity 200, deferent segment 1 " through the recirculation hole 103 of input section 1 ', into valve After press；The ring-shaped sealing sleeve 305 at both ends is closely affixed with valve core tube 1；Meanwhile " the driving of end side inner cavity 8 ' of sleeve II 2 Gap of the medium between the outer ring surface of valve body 2 and the inner ring surface of outer valve 8 flows into the inner cavity 8 ' of I 2 ' end of sleeve side.

Embodiment nine

Referring to attached drawing 17,18, dual-valve body bridge cut-off core pipe valve described in the present embodiment is especially used for toxic for opening and closing The opening and closing of hazardous medium；The axial forward end face of 100 kernel of interlayer is ligulate triangle slope surface 100 ', and axial rearward end face is taper Slope surface；" end cap with outer valve 8 is one to deferent segment 1, and input section 1 ' is fixedly connected with outer valve 8；There are two diameters for input section 1 ' To recirculation hole 103, " match with the duct 200 of valve body 2；The knot of input section 1 ' and sleeve I 2 ' and deferent segment 1 " with sleeve II 2 " Conjunction portion is respectively provided with 302 dual-seal of bellows seal 300 and sealing ring, a communicating pipe 602 penetrates through two sylphon seals The inner cavity of part 300 is to reduce opening and closing resistance；Wave is set between I 2 ' end face of sleeve and axially opposing 8 inner face of outer valve answered Line blind pipe 308, ripple blind pipe 308 are penetrated through by communicating pipe 600 and driving pressure；Sleeve II 2 " end face and it is axially opposing answer it is outer Compressed spring 4 is set between 8 inner face of valve body.

Shown in attached drawing 17, it is open state, starts driving pressure, ripple blind pipe 308 is passed to by communicating pipe 600, The thrust that the pressure medium of inner cavity is formed is greater than the elastic force of compressed spring 4, and pushing valve body 2 to deferent segment 1, " direction is mobile, sleeve II 2 " ring-shaped valve seats 201 of throat leaves annular spool 101, and medium flows into duct 200 through 1 ' recirculation hole 103 of input section ", inner cavity 200, deferent segment 1 ", into the rear pressure of valve.

It shown in attached drawing 18, is in off state, closes driving pressure, 308 inner cavity of ripple blind pipe loses pressure medium, compression The elastic force of spring 4 pushes valve body 2 mobile to 1 ' direction of input section, during the shutdown process, when the circulation for being moved across input section 1 ' When 103 aperture length of hole, I 2 ' annular inner wall of sleeve covers the recirculation hole 103 of input section 1 '；" the ring-shaped valve seats of throat of sleeve II 2 201 are closely affixed with annular spool 101.

Embodiment ten

Referring to attached drawing 19,20, dual-valve body bridge cut-off core pipe valve described in the present embodiment is cut off, especially for automatic emergency Automatic emergency for high abrasive media such as slurries is cut off；The axial forward end face of 100 kernel of interlayer is ligulate triangle slope surface 100 ', axial rearward end face is taper slope surface；" the both ends end cap with outer valve 8 is one for input section 1 ' and deferent segment 1；Input section 1 ' there are two the recirculation hole 103 of radial rake, " matches with the duct 200 of valve body 2；Input section 1 ' and sleeve I 2 ' and deferent segment The engaging portion of 1 " with sleeve II 2 " is respectively provided with sealing ring 302；Sleeve II 2 " end face and axially opposing 8 inner face of outer valve answered it Between ripple blind pipe 308, the preceding pressure perforation that ripple blind pipe 308 passes through communicating pipe 600 and valve are set；I 2 ' end face of sleeve and axial phase Compressed spring 4 is set between corresponding 8 inner face of outer valve.

It is open state shown in attached drawing 19, pipe network pressure medium is normal, and the elastic force of compressed spring 4 is greater than ripple blind pipe 308 The thrust that inner cavity pressure medium is formed, keeping valve body 2 in the open state always, sleeve II 2, " ring-shaped valve seats 201 of throat leaves Annular spool 101, medium flows into duct 200 ", inner cavity 200, deferent segment 1 " through the recirculation hole 103 of input section 1 ', into after valve Pressure.

It is emergency cut-off state, pipe network pressure medium superelevation, 308 inner cavity pressure medium shape of ripple blind pipe shown in attached drawing 20 At thrust superelevation in the elastic force of compressed spring 4, keep valve body 2 mobile to 1 ' direction moment of input section, " the ring of throat of sleeve II 2 Shape valve seat 201 is closely affixed with annular spool 101；Medium flow field is cut off, prevents equipment, pipe network and environment from being destroyed.

Embodiment 11

Referring to attached drawing 21,22,23,24, dual-valve body bridge cut-off core pipe valve described in the present embodiment is automatically tight for two-way booster It is eager disconnected, especially cut off for the two-way booster automatic emergency of poisonous and harmful, inflammable and explosive, nuclear energy medium such as LNG medium；Institute The axial forward end face for stating 100 kernel of interlayer is ligulate triangle slope surface 100 ', and axial rearward end face is taper slope surface；Input section 1 ' and outer The end cap of valve body 8 is one, and deferent segment 1 " is fixedly connected with outer valve 8；There are two the recirculation holes of radial rake for input section 1 ' 103, " match with the duct 200 of valve body 2；Input section 1 ' and the engaging portion of sleeve I 2 ' and deferent segment 1 " with sleeve II 2 " are all provided with Set bellows seal 300；Ripple blind pipe 308 is set between I 2 ' end face of sleeve and axially opposing 8 inner face of outer valve answered, Ripple blind pipe 308 walks T shape pipeline, is penetrated through by the preceding pressure of the communicating pipe 600 with control valve 605 and valve, passes through band control valve 606 Communicating pipe 601 and valve rear pressure perforation；A piece valve rod 504 is threaded through valve rod base 504 ' and the I 2 ' end of sleeve of outer valve 8 It is flexibly connected, bellows seal 300 is set between I 2 ' end face of sleeve and axially opposing 8 inner face of outer valve answered and wraps up valve Bar 504；After valve rod 504 exits valve rod base 504 ', sealing-plug 804 is threaded into valve rod base 504 '；Sleeve II 2 " end face and axial direction Compressed spring 4 is set between corresponding 8 inner face of outer valve；1 ' ring wall of input section has radial communication hole 105 ", ditch port valve Preceding pressure and 300 inner cavity of bellows seal, 1 ' ring wall of deferent segment have radial communication hole 105 ", the rear pressure and bellows of ditch port valve are close 300 inner cavity of sealing；A radial check-valves 608 is arranged in 1 ' ring wall of input section, when valve is closed with duct 200 " perforation, Prevent under air-tight state media expansion such as: LNG valve is converted to gaseous state by liquid；Traditional valve can not need setting check-valves 608；It rolls and connects in the outer ring surface setting ball 707 and 8 inner ring surface of outer valve of valve body 2.

It is open state shown in attached drawing 21, screw propulsion valve rod 504 makes valve body 2 to deferent segment 1, and " direction is mobile, sleeve II 2 " ring-shaped valve seats 201 of throat leaves annular spool 101, and medium flows into duct 200 through 1 ' recirculation hole 103 of input section ", inner cavity 200, deferent segment 1 ", into the rear pressure of valve；Then, control valve 605 is opened, ripple blind pipe 308 is passed to by communicating pipe 600, The thrust that the pressure medium of its inner cavity is formed is greater than the elastic force of compressed spring 4.

Shown in attached drawing 22, it is open state, is pressed onto after valve up to after normal pressure, then open control valve 606, makes communicating pipe 601 and the pressure communication of communicating pipe 600 and almost the same, the thrust that the pressure medium of 308 inner cavity of ripple blind pipe is formed is still big In the elastic force of compressed spring 4, keep valve in the open state always；Then, valve rod 504 exits valve rod base 504 ', sealing-plug 804 It is threaded into valve rod base 504 '.

It is Abnormal Shutdown state, due to the rear pressure booster of valve, the pressure medium of communicating pipe 600 passes through company shown in attached drawing 23 Siphunculus 601 enters the rear pressure of valve, and 308 inner cavity of ripple blind pipe loses pressure medium, the elastic force of compressed spring 4 push valve body 2 to 1 ' direction of input section is mobile, during the shutdown process, when being moved across 103 aperture length of recirculation hole of input section 1 ', and sleeve I 2 ' The recirculation hole 103 of annular inner wall covering input section 1 '；Sleeve II 2 " ring-shaped valve seats 201 of throat and the close phase of annular spool 101 Patch prevents upstream medium to be lost, meanwhile, starting automatic control system closes control valve 605, protects resource, protects environment, protection The security of the lives and property.

It is Abnormal Shutdown state, due to the preceding pressure booster of valve, the pressure medium of communicating pipe 601 passes through company shown in attached drawing 24 Siphunculus 600 enters the preceding pressure of valve, and 308 inner cavity of ripple blind pipe loses pressure medium, the elastic force of compressed spring 4 push valve body 2 to 1 ' direction of input section is mobile, during the shutdown process, when being moved across 103 aperture length of recirculation hole of input section 1 ', and sleeve I 2 ' The recirculation hole 103 of annular inner wall covering input section 1 '；Sleeve II 2 " ring-shaped valve seats 201 of throat and the close phase of annular spool 101 Patch, prevents downstream media from flowing backwards, meanwhile, starting automatic control system closes control valve 606, protects resource, protects environment, protection The security of the lives and property.

Embodiment 12

Referring to attached drawing 25,26,27,28, dual-valve body bridge cut-off core pipe valve described in the present embodiment is special for opening and closing and adjusting It is not the opening and closing and adjusting for poisonous and harmful, inflammable and explosive, nuclear energy medium such as LNG medium；The axial direction of 100 kernel of interlayer Front end face is spherical surface, and axial rearward end face is taper slope surface；Input section 1 ' is integrated with 8 end cap of outer valve, deferent segment 1 " with outer valve Body 8 is fixedly connected；Input section 1 ' there are four radial recirculation hole 103, the axial direction of recirculation hole 103 in its trapezoidal microcephaly of circular arc be directed toward every Layer 100, four ducts 200 of corresponding valve body 2 " the area of a circle of radial bore cover the area of recirculation hole 103；Input section 1 ' is respectively provided with bellows seal 300 with the engaging portion of sleeve I 2 ' and deferent segment 1 " and sleeve II 2 "；I 2 ' end face of sleeve and axis To ripple blind pipe 308 is arranged between corresponding 8 inner face of outer valve, 308 inner cavity of ripple blind pipe is connect with communicating pipe 600 and valve Preceding pressure perforation；" compressed spring 4 is arranged in sleeve II 2 between end face and axially opposing 8 inner face of outer valve answered；Input section 1 ' Ring wall has radial communication hole 105 ", 300 inner cavity of preceding pressure and bellows seal of ditch port valve, 1 ' ring wall of deferent segment has radial communication Hole 105 ", 300 inner cavity of rear pressure and bellows seal of ditch port valve；A radial check-valves 608 is arranged in 1 ' ring wall of input section, " perforation, prevent under air-tight state media expansion such as: LNG valve is converted to gas by liquid with duct 200 when valve is closed State；Traditional valve can not need setting check-valves 608.

It is open state, pipe network pressure medium is normal, the driving pressure medium of 308 inner cavity of ripple blind pipe shown in attached drawing 25 Greater than the elastic force of compressed spring 4, pushing valve body 2 to deferent segment 1, " direction is mobile, and " ring-shaped valve seats 201 of throat leaves sleeve II 2 Annular spool 101, medium flows into duct 200 ", inner cavity 200, deferent segment 1 " through 1 ' recirculation hole 103 of input section, into after valve Pressure.

It is more than half open state shown in attached drawing 26, pipe network pressure medium is higher than normal pressure, 308 inner cavity of ripple blind pipe Drive pressure medium to be higher than the elastic force of compressed spring 4, valve body 2 pushed to continue to deferent segment 1 " direction is mobile, sleeve I 2 ' annular Inner wall has covered 1 ' recirculation hole 103 of fraction input section, and medium flows into duct 200 by 1 ' recirculation hole 103 of input section ", inner cavity 200, deferent segment 1 ", the rear pressure of valve is entered after throttling, decompression.

It is smaller part open state, pipe network pressure medium superelevation is in normal pressure, 308 inner cavity of ripple blind pipe shown in attached drawing 27 Driving pressure medium superelevation in the elastic force of compressed spring 4, push valve body 2 to continue to deferent segment 1 " direction is mobile, sleeve I 2 ' Annular inner wall has covered most of 1 ' recirculation hole 103 of input section, and medium flows into duct 200 by 1 ' recirculation hole 103 of input section ", Inner cavity 200, deferent segment 1 ", the rear pressure of valve is entered after throttling, decompression.

It shown in attached drawing 28, is in off state, pipe network pressure medium subnormal pressure or loses pressure source, ripple blind pipe The driving pressure medium of 308 inner cavities is less than the elastic force of compressed spring 4, and compressed spring 4 pushes valve body 2 to move to 1 ' direction of input section Dynamic, during the shutdown process, when being moved across 103 aperture length of recirculation hole of input section 1 ', I 2 ' annular inner wall of sleeve covers defeated Enter the recirculation hole 103 of section 1 '；" ring-shaped valve seats 201 of throat is closely affixed sleeve II 2 with annular spool 101.

Embodiment 13

Referring to attached drawing 29,30, dual-valve body bridge cut-off core pipe valve described in the present embodiment, for pressure opening and closing, non-return, especially For poisonous and harmful, inflammable and explosive, nuclear energy the medium such as opening and closing of LNG medium, non-return；Outer valve 8 inner cavity 8 ' of being wrapped in Valve core tube 1 be fixing piece perpendicular to the ground sleeve I 2 through valve body 2 coaxial from bottom to up ', 2 inner cavity 200 of valve body and Valve body 2 sleeve II 2 "；The upper axial end face of 100 kernel of interlayer is ligulate triangle slope surface 100 ', and lower axial end face is taper slope Face；" end cap with outer valve 8 is one to deferent segment 1, and input section 1 ' is fixedly connected with outer valve 8；There are two radial for input section 1 ' Recirculation hole 103 " matches with the duct 200 of valve body 2；The combination of input section 1 ' and sleeve I 2 ' and deferent segment 1 " and sleeve II 2 " Portion is respectively provided with bellows seal 300；It is blind that ripple is set between I 2 ' end face of sleeve and axially opposing 8 inner face of outer valve answered Pipe 308, ripple blind pipe 308 can also penetrate through the driving pressure of other media by the perforation of the preceding pressure of communicating pipe 600 and valve.

It is opened and closed for pressure:

It is open state shown in attached drawing 29, pipe network pressure medium reaches rated pressure and is simultaneously greater than the self weight of valve body 2, ripple The driving force of the pressure initiation of 308 inner cavity medium of blind pipe pushes valve body 2 is axial to move up, " the ring-shaped valve seats 201 of throat of sleeve II 2 Leave annular spool 101, medium flows into duct 200 ", inner cavity 200, deferent segment 1 " through the recirculation hole 103 of input section 1 ', into valve Rear pressure.

It shown in attached drawing 30, is in off state, pipe network pressure medium is less than the self weight of valve body 2, valve body 2 lower than rated pressure simultaneously Self weight moves down valve body 2 axially, during the shutdown process, when being moved across 103 aperture length of recirculation hole of input section 1 ', sleeve The recirculation hole 103 of I 2 ' annular inner wall covering input section 1 '；" ring-shaped valve seats 201 and annular spool 101 of throat are close for sleeve II 2 It is affixed.

For non-return:

It is open state, pipe network pressure medium is normal, the pressure initiation of 308 inner cavity medium of ripple blind pipe shown in attached drawing 29 Driving force be self-possessed greater than valve body 2, push valve body 2 is axial to move up, " ring-shaped valve seats 201 of throat leaves annular spool to sleeve II 2 101, medium flows into duct 200 ", inner cavity 200, deferent segment 1 " through the recirculation hole 103 of input section 1 ', into the rear pressure of valve.

Shown in attached drawing 30, be in off state, pipe network pressure medium subnormal pressure or lose pressure source, valve body 2 from Move down valve body 2 axially, during the shutdown process, when being moved across 103 aperture length of recirculation hole of input section 1 ', sleeve I The recirculation hole 103 of 2 ' annular inner walls covering input section 1 '；" ring-shaped valve seats 201 and annular spool 101 of throat are close for sleeve II 2 It is affixed, realizes non-return.

Claims (10)

1. dual-valve body bridge cut-off core pipe valve, which is characterized in that the valve core tube (1) for being wrapped in outer valve (8) inner cavity (8 ') is fixing piece The coaxial sleeve II (2 ") through the sleeve I (2 ') of valve body (2), valve body (2) inner cavity (200) and valve body (2)；Spool Pipe (1) in the middle part of have axial interlayer (100), interlayer (100) by kernel and the valve core tube (1) of kernel radial radiation intermediate pipeline section structure At；The axial both sides of interlayer (100) are concentric input section (1 ') and deferent segment (1 ") respectively, deferent segment (1 ") and interlayer (100) it is detached from and is had distance, has at least one radial recirculation hole (103) with the input section (1 ') that interlayer (100) is connected adjacent；Valve The chamber portion of body (2) inner cavity (200) is half, and another half entity part has the duct (200 ") of hollow out from sleeve I (2 ') ring Shape inner wall is radially into then, turn is axial to flow into inner cavity (200), Cheng " ╗ " shape, the input section of radial bore and pairing The recirculation hole (103) of (1 ') is corresponding to match；Annular spool (101) and sleeve II (2 ") throat around interlayer (100) Ring-shaped valve seats (201) constitutes sealing pair；The outer diameter of input section (1 ') is greater than the outer diameter of deferent segment (1 "), input section (1 ') and sleeve I (2 ') and deferent segment (1 ") and sleeve II (2 ") are that shaft hole mode cooperates its engaging portion to be respectively provided with sealing；Axial direction in outer valve (8) Any end setting valve rod (504) passes through outer valve (8) and connect with axially opposing valve body (2) end answered；In both direction gesture Under the action of energy, valve body (2) makees axial reciprocating movement relative to valve core tube (1).

2. dual-valve body bridge cut-off core pipe valve, which is characterized in that the valve core tube (1) for being wrapped in outer valve (8) inner cavity (8 ') is fixing piece The coaxial sleeve II (2 ") through the sleeve I (2 ') of valve body (2), valve body (2) inner cavity (200) and valve body (2)；Spool Pipe (1) in the middle part of have axial interlayer (100), interlayer (100) by kernel and the valve core tube (1) of kernel radial radiation intermediate pipeline section structure At；The axial both sides of interlayer (100) are concentric input section (1 ') and deferent segment (1 ") respectively, deferent segment (1 ") and interlayer (100) it is detached from and is had distance, has at least one radial recirculation hole (103) with the input section (1 ') that interlayer (100) is connected adjacent；Valve The chamber portion of body (2) inner cavity (200) is half, and another half entity part has the duct (200 ") of hollow out from sleeve I (2 ') ring Shape inner wall is radially into then, turn is axial to flow into inner cavity (200), Cheng " ╗ " shape, the input section of radial bore and pairing The recirculation hole (103) of (1 ') is corresponding to match；Annular spool (101) and sleeve II (2 ") throat around interlayer (100) Ring-shaped valve seats (201) constitutes sealing pair；The outer diameter of input section (1 ') is greater than the outer diameter of deferent segment (1 "), input section (1 ') and sleeve I (2 ') and deferent segment (1 ") and sleeve II (2 ") are that shaft hole mode cooperates its engaging portion to be respectively provided with sealing；Sleeve I (2 ') and sleeve II Ripple blind pipe (308) are set between at least one sleeve end face of (2 ") and axially opposing outer valve (8) inner face answered, ripple Blind pipe (308) penetrates through driving pressure by communicating pipe (600)；Under the action of both direction potential energy, valve body (2) is relative to spool It is mobile that pipe (1) makees axial reciprocating.

3. dual-valve body bridge cut-off core pipe valve, which is characterized in that the valve core tube (1) for being wrapped in outer valve (8) inner cavity (8 ') is fixing piece The coaxial sleeve II (2 ") through the sleeve I (2 ') of valve body (2), valve body (2) inner cavity (200) and valve body (2)；Spool Pipe (1) in the middle part of have axial interlayer (100), interlayer (100) by kernel and the valve core tube (1) of kernel radial radiation intermediate pipeline section structure At；The axial both sides of interlayer (100) are concentric input section (1 ') and deferent segment (1 ") respectively, deferent segment (1 ") and interlayer (100) it is detached from and is had distance, has at least one radial recirculation hole (103) with the input section (1 ') that interlayer (100) is connected adjacent；Valve The chamber portion of body (2) inner cavity (200) is half, and another half entity part has the duct (200 ") of hollow out from sleeve I (2 ') ring Shape inner wall is radially into then, turn is axial to flow into inner cavity (200), Cheng " ╗ " shape, the input section of radial bore and pairing The recirculation hole (103) of (1 ') is corresponding to match；Annular spool (101) and sleeve II (2 ") throat around interlayer (100) Ring-shaped valve seats (201) constitutes sealing pair；The outer diameter of input section (1 ') is greater than the outer diameter of deferent segment (1 "), input section (1 ') and sleeve I (2 ') and deferent segment (1 ") and sleeve II (2 ") are that shaft hole mode cooperates its engaging portion to be respectively provided with sealing；One communicating pipe (600) wears Cross outer valve (8) through-hole it is corresponding with sleeve I (2 ') end and inner cavity (8 ') perforation；One communicating pipe (601) passes through outer valve (8) through-hole is corresponding with (the 2 ") end of sleeve II and inner cavity (8 ') penetrate through；Under the action of both direction potential energy, valve body (2) phase It is mobile that axial reciprocating is made for valve core tube (1).

4. according to any dual-valve body bridge cut-off core pipe valve of claims 1 to 3, which is characterized in that the sleeve I (2 ') and sleeve Compressed spring (4) are set between one of sleeve end face of pipe II (2 ") and axially opposing outer valve (8) inner face answered.

5. according to any dual-valve body bridge cut-off core pipe valve of claims 1 to 3, which is characterized in that the interlayer (100) with it is defeated Entering section (1 ') is that two parts are welded.

6. according to any dual-valve body bridge cut-off core pipe valve of claims 1 to 3, which is characterized in that the insertion sleeve II The ring-shaped valve seats (201) of (2 ") throat is axially concaved sleeve II (2 ") throat.

7. according to any dual-valve body bridge cut-off core pipe valve of claims 1 to 3, which is characterized in that the input section (1 ') and The wherein at least one of deferent segment (1 ") and the end cap of outer valve (8) are one.

8. according to any dual-valve body bridge cut-off core pipe valve of claims 1 to 3, which is characterized in that input section (1 ') ring A radial check-valves (608) is arranged in wall, penetrates through when valve is closed with duct (200 ").

9. according to any dual-valve body bridge cut-off core pipe valve of claims 1 to 3, which is characterized in that the input section (1 ') with Bellows seal (300) are arranged in the engaging portion of sleeve I (2 '), and bellows seal (300) inner cavity passes through input section (1 ') ring The preceding pressure perforation of the intercommunicating pore (105 ") and valve of wall；Bellows seal is arranged in the engaging portion of deferent segment (1 ") and sleeve II (2 ") (300), the rear pressure perforation that bellows seal (300) passes through the intercommunicating pore (105 ") and valve of deferent segment (1 ") ring wall.

10. according to any dual-valve body bridge cut-off core pipe valve of claims 1 to 3, which is characterized in that the input section (1 ') with The two basic change portion of sleeve I (2 ') and deferent segment (1 ") and sleeve II (2 ") is respectively provided with bellows seal (300) and sealing ring (302), two bellows seal (300) inner cavities are penetrated through by communicating pipe (602).