CN206206635U - A kind of pressure-control valve - Google Patents

Abstract

The utility model discloses a kind of pressure-control valve, including valve body and valve element, liquid chlorine runner is provided with valve body, valve body both sides are provided with the inlet and outlet with liquid chlorine flow passage, valve element includes insert body and valve seat, the valve seat of horizontal positioned U-shaped is arranged on the middle part of liquid chlorine runner, valve seat is by the liquid chlorine channel partition into first paragraph runner and second segment runner, external diameter conical section is provided with sprue lower surface, connection cavity is provided with two vertical sections of valve seat, valve rod is vertically through two connection cavitys, multiple fixture blocks are circumferentially being provided with its external wall along conical section, multiple draw-in grooves are provided with connection cavity inner wall, sealing ring is fixed with the lower surface of conical section.By the reciprocating motion of valve rod in the vertical direction, it is capable of achieving connection and opening and closing between liquid chlorine storage tank and transfer cask, and then the quick precise control for realizing liquid chlorine flow during liquid chlorine filling, it is to avoid because liquid chlorine dam not in time or the low precision that dams cause the leakage of liquid chlorine.

Description

A kind of pressure-control valve

Technical field

The utility model is related to a kind of control valve of liquid chlorine filling system, specifically refers to a kind of pressure-control valve.

Background technology

In chemical industry chlor-alkali production industry, product is related to the harmful influences such as liquid chlorine, and its sale is filled with very big difficulty, and Fill the very various complexity of formality；Because liquid chlorine has toxicity, easily gasification, once revealing, process not in time or cannot locate During reason, the person will be caused serious injury, so that trigger serious accident, therefore it fills requirement strictly, safety guarantee Measure must be perfect.When liquefied chlorine cistern car is carried out, tank car pressure can rise and increase with liquid chlorine temperature in tank car, once hypertonia Tank car tank body just has the danger exploded.Any liquid chloro container, its volumetric efficiency must not exceed 80%, it is seen that liquid chlorine filling During accurate metering just seem particularly significant, not only to consider safety factor, and as benefit unit, its measuring accuracy Also it is directly connected to sales achievement.However, the metering that fills of liquid chlorine is a complex process affected by many factors, such as fill Error in dipping that the type selecting and alignment error of device itself cause, fill pipeline gas-liquid two-phase and evacuate error in dipping, the ring for causing Error that error in dipping that border temperature causes, extraneous vibration interference cause etc..Simultaneously to improve quantifying and loading metering benefit, reduce The lost on sale that error in dipping brings, had not only been had measuring accuracy higher, stability but also had been compared proper measurement environment from a kind of Mass flowmenter and open the quantitative controller that stops and seem necessary to improve security, just.

Utility model content

The purpose of this utility model is to provide a kind of pressure-control valve, it is ensured that flexible modulation of the liquid chlorine when filling, and is carried The measuring accuracy of liquid chlorine high.

The purpose of this utility model is achieved through the following technical solutions：

A kind of pressure-control valve, including valve body and valve element, are provided with liquid chlorine runner in valve body, valve body both sides be provided with respectively with liquid The inlet and outlet of chlorine flow passage, the valve element includes insert body and matched U-shaped valve seat, horizontal positioned U-shaped Valve seat be arranged on the middle part of liquid chlorine runner, valve seat is by the liquid chlorine channel partition into first paragraph runner and second segment runner, institute Stating insert body includes valve rod and two sprues being disposed on valve rod, and external diameter is provided with sprue lower surface along stem shaft The conical section that line direction is successively decreased downwards, conical section is set on the outer circle wall of valve rod, the valve seat horizontal positioned, and in valve seat Two vertical sections on be provided with the connection cavity being engaged with conical section, valve rod runs through two connection cavitys vertically, Multiple fixture blocks are circumferentially provided with its external wall along the conical section, are provided with connection cavity inner wall and multiple are mutually fitted with the fixture block The draw-in groove answered, sealing ring is fixed with the lower surface of the conical section, and the external diameter of the sealing ring is more than under the connection cavity The internal diameter of end opening；Two are provided with the valve rod just to the baffle of connection cavity lower ending opening, the baffle epimere External diameter successively decreases upwards along the valve rod axis；Supporter is installed in valve body upper end, supporting plate is fixed on supporter upper surface, Supporter middle part is provided with cavity, and drive rod is provided with valve rod upper end, and the drive rod activity is after the cavity, supporting plate Upwardly extend, filler is provided with the cavity, retreat stop block is additionally provided with valve inner, it is just right that the upper surface of retreat stop block is provided with The retaining hole of valve rod bottom, spring is provided with the retaining hole, and organ is fixed with the outer wall of the valve rod lower end Cover, and the lower end of the organ cover is connected with valve body lower end inwall.

For leakage problem, hair caused by the prior art, controlling valve element easily to occur damming inaccurately when in use It is bright that existing valve element is improved, on the premise of control valve element flexible modulation is ensured, improve damming precisely for control valve element Degree, to ensure measuring accuracy of the liquid chlorine in filling process, what the loss for reducing liquid chlorine improved liquid chlorine simultaneously fills efficiency；Use When, it is provided with liquid chlorine runner in valve body, and the valve seat horizontal positioned of U-shaped is arranged on the middle part of liquid chlorine runner so that valve body enters Mouth connects cavity and outlets by two be opened on valve seat, and before filling, conical section is contacted with connection cavity wall, while Fixture block cooperates with draw-in groove so that two connection cavitys realize primary seal, and the sealing ring on conical section lower surface is then real The secondary seal of cavity lower ending opening is now connected, by primary seal and secondary seal so that liquid chlorine runner is insulated completely Into two parts, to maintain to control valve element to liquid chlorine storage tank and extraneous isolation effect；When filling, liquid chlorine is flowed into by import Between U-shaped valve base inner wall and import constitute first paragraph runner in, now stir valve rod so that conical section with connect cavity wall it Between be gradually disengaged, liquid chlorine then along connection cavity and conical section between gap enter into U-shaped valve seat outer wall and outlet between constitute Second segment runner in, eventually pass outlet and be injected into transfer cask body.By the reciprocating motion of valve rod in the vertical direction, i.e., Connection and opening and closing between liquid chlorine storage tank and transfer cask are capable of achieving, and then quickly realize the essence of liquid chlorine flow during liquid chlorine filling Really control, it is to avoid because liquid chlorine dam not in time or the low precision that dams cause the leakage of liquid chlorine, with reach ensure liquid chlorine exist Flexible modulation when filling, improves the purpose of the measuring accuracy of liquid chlorine.

Wherein, move on the valve rod until conical section with connect after cavity inner wall completely disengages from, liquid chlorine is quickly through connecting chamber Body is flowed into second segment runner by first paragraph runner, and now the liquid chlorine in first paragraph runner can be because under connection cavity above End opening internal diameter it is smaller and select it is underlying connection cavity in flow out, and in first paragraph runner the overwhelming majority liquid chlorine can be right The valve interior wall of the connection cavity lower ending opening for being just pointed to lower section in second segment runner forms intense impact, can be led when serious Valve interior wall is caused to be subject to sharp impacts and be damaged, inventor is provided with two on valve rod and is just led to connection cavity lower ending opening Block is flowed, and the epimere external diameter of the baffle successively decreases upward along valve rod axis, i.e., form a circular cone in the lower end of connection cavity The guide face of shape so that the liquid chlorine in first paragraph runner is again divided into two plumes and goes out, i.e., guiding of the first strand liquid chlorine in guide face Flowed out at lower edge connection cavity lower ending opening above, and second strand of liquid chlorine is along underlying connection cavity lower ending opening Place's outflow, and second strand of liquid chlorine is spreading apart under the guiding of guide face after flowing into second segment runner to surrounding, it is to avoid can To a little carrying out constant impingement on valve interior wall, and then the loss percentage of valve interior wall is reduced, while ensureing by first paragraph runner The flow for branching to two strands of liquid chlorines in second segment runner tends to balance, equal with the stress for ensureing upper and lower two parts in valve body Weighing apparatus, it is to avoid the lower section excessive wear of valve interior wall and reduce its service life.

Liquid chlorine cut-off sealing is realized by the cooperation between valve element and valve seat in valve body, and the drive part of valve rod is same Easily there is leakage, therefore inventor, in the upper surface fixed support body of valve body, the upper end of supporter is fixed with supporting plate, described Supporting plate is used to install the driver parts such as cylinder, and the upper end of valve rod is provided with drive rod, and supporter middle part is provided with cavity, cavity It is interior that filled with filler, drive rod is upwardly extended after cavity and supporting plate of the activity in the supporter successively, until with driving Part output end connection, similarly, sealing gasket is installed in supporter lower end, the sealing gasket can by the lower end of drive rod with Isolation is opened between cavity, by sealing gasket and dual-seal of the filler to drive rod, can avoid the liquid chlorine in valve body through valve element Leaked at driver part, also, axle sleeve is installed in the junction of supporting plate and supporter, drive rod activity runs through the axle Set, to ensure that drive rod can realized pumping after being connected with driver part output end under air-proof condition.And Organ cover is installed, the organ cover opens retaining hole with valve inner isolation on valve rod lower end outer wall, when valve rod is moved down, organ Cover is compressed and is moved down in the lump with valve rod, and is arranged on deformation and deformation recovery institute of the spring in retaining hole then using itself The elastic force of generation enters row buffering to the movement tendency of valve rod, to reduce impact of the valve rod to retaining hole and valve interior wall, it is to avoid Valve rod is impacted and is influenceed sealing between conical section and valve seat.

The width of the fixture block successively decreases downwards along the axis direction of the valve rod.Fixture block causes conical section with the cooperation of draw-in groove Increase with the contact area connected between cavity wall, that is, increase the sealing effectiveness of primary seal, while the width of fixture block is along valve rod Axis direction successively decrease downwards, similarly connect cavity wall on draw-in groove groove width also successively decrease downwards along the axis direction of valve rod, i.e., The liquid chlorine residual quantity in draw-in groove can be reduced when being blocked to liquid chlorine runner, and fixture block is in the contact process with draw-in groove, The deformation quantity that fixture block is squeezed and occurs can be restricted in the part that draw-in groove groove width is gradually reduced, i.e., fixture block and draw-in groove it Between interaction force along valve rod axially direction directed downwardly be incremented by, and then increase primary seal sealing effectiveness.

The longitudinal cross-section of the sealing ring is the U-shaped of horizontal positioned.Preferably, the longitudinal cross-section of sealing ring is U-shaped, i.e., In the folding process of valve rod, lower ending opening of the sealing ring gradually with connection cavity is contacted, until draw-in groove agrees with completely with fixture block, Valve rod stops movement, and now sealing ring occurs certain deformation and secondary seal is realized in the lower end to connecting cavity, and longitudinal cross-section Be the sealing ring of U-shaped when with connecting cavity mutually extruding occurring, the deformation of sealing ring outer circumference is by its U-shaped portion point Possess certain deformation space, that is, prevent the part that sealing function is played on sealing ring not result in internal action stress concentration And be damaged, to ensure the stability of secondary seal, while extending the service life of sealing ring.

The fixture block and sealing ring use polytetrafluoroethylene (PTFE) material.Preferably, liquid chlorine possess it is active chemically Matter, is provided simultaneously with corrosivity, and the service life of the general elastomeric material as sealing medium under liquid chlorine environment is shorter, easily There is the phenomenon of hardening cracking, and inventor selects polytetrafluoroethylene (PTFE) material as fixture block and the raw material of sealing ring, utilizes Its good decay resistance, to ensure the stability of guarantee primary seal and secondary seal in control valve, while extension The service life of fixture block and sealing ring, the frequency that drop low control valve inner part is changed.

The utility model compared with prior art, has the following advantages and advantages：

1st, the utility model is by the reciprocating motion of valve rod in the vertical direction, you can realize liquid chlorine storage tank and transfer cask it Between connection and opening and closing, and then the quick precise control for realizing liquid chlorine flow during liquid chlorine filling, it is to avoid because of damming for liquid chlorine Not in time or dam low precision and cause the leakage of liquid chlorine, to reach the flexible modulation for ensureing liquid chlorine when filling, improve liquid The purpose of the measuring accuracy of chlorine；

2nd, the draw-in groove groove width on connection cavity wall of the present utility model is also successively decreased downwards along the axis direction of valve rod, i.e., right Liquid chlorine runner can reduce the liquid chlorine residual quantity in draw-in groove when being blocked, and fixture block is in the contact process with draw-in groove, fixture block The deformation quantity for being squeezed and occurring can be restricted in the part that draw-in groove groove width is gradually reduced, i.e., between fixture block and draw-in groove Interaction force along valve rod axially direction directed downwardly be incremented by, and then increase primary seal sealing effectiveness；

3rd, the utility model selects polytetrafluoroethylene (PTFE) material as fixture block and the raw material of sealing ring, good using its Decay resistance, to ensure to ensure in control valve the stability of primary seal and secondary seal, while extend fixture block and The service life of sealing ring, the frequency that drop low control valve inner part is changed.

Brief description of the drawings

Accompanying drawing described herein is used for providing further understanding the utility model embodiment, constitutes the one of the application Part, does not constitute the restriction to the utility model embodiment.In the accompanying drawings：

Fig. 1 is structural representation of the present utility model；

Fig. 2 is the structural representation of insert body.

Mark and corresponding parts title in accompanying drawing：

1- valve bodies, 2- imports, 3- retainings hole, 31- springs, 32- organs cover, 4- valve seats, 5- connections cavity, 51- draw-in grooves, 6- Insert body, 61- valve rods, 62- sprues, 63- conical sections, 64- fixture blocks, 65- sealing rings, 66- baffles, 7- outlets, 8- sealings Pad, 9- drive rods, 10- fillers, 11- supporters, 12- axle sleeves, 13- supporting plates.

Specific embodiment

To make the purpose of this utility model, technical scheme and advantage become more apparent, with reference to embodiment and accompanying drawing, The utility model is described in further detail, and exemplary embodiment of the present utility model and its explanation are only used for explaining this Utility model, is not intended as to restriction of the present utility model.

Embodiment 1

As depicted in figs. 1 and 2, the present embodiment includes being provided with liquid chlorine runner, the both sides of valve body 1 in valve body 1 and valve element, valve body 1 The import 2 and outlet 7 respectively with liquid chlorine flow passage are provided with, the valve element includes insert body 6 and matched U-shaped valve Seat 4, the valve seat 4 of horizontal positioned U-shaped is arranged on the middle part of liquid chlorine runner, and valve seat 4 is by the liquid chlorine channel partition into first paragraph stream Road and second segment runner, the insert body 6 include valve rod 61 and two sprues 62 being disposed on valve rod 61, in sprue 62 lower surfaces are provided with the conical section 63 that external diameter successively decreases downwards along the axis direction of valve rod 61, and conical section 63 is set in the outer of valve rod 61 In circumferential wall, the horizontal positioned of the valve seat 4, and the company being engaged with conical section 63 is provided with two vertical sections of valve seat 4 Cavity body 5, valve rod 61 through two connection cavitys 5, is being provided with many on its external wall along the conical section 63 is circumferential vertically Individual fixture block 64, is provided with multiple draw-in grooves 51 being adapted with the fixture block 64, in the conical section 63 on the connection inwall of cavity 5 Lower surface is fixed with sealing ring 65, the internal diameter of the external diameter more than the connection lower ending opening of cavity 5 of the sealing ring 65；Described Valve rod 61 is provided with two just to the baffle 66 of the connection lower ending opening of cavity 5, and the epimere external diameter of the baffle 66 is along the valve The axis of bar 61 successively decreases upwards.Supporter 11 is installed in the upper end of valve body 1, supporting plate 13 is fixed on the upper surface of supporter 11, in branch The middle part of support body 11 is provided with, and drive rod 9 is provided with the upper end of valve rod 61, and the activity of the drive rod 9 runs through the cavity, supporting plate 13 After upwardly extend, filler 10 is provided with the cavity, retreat stop block is additionally provided with inside valve body 1, the upper surface of retreat stop block is opened There is the retaining hole 3 just to the bottom of valve rod 61, spring 31 is installed in the retaining hole 3, in the outer of the lower end of the valve rod 61 Organ cover 32 is fixed with wall, and the lower end of the organ cover 32 is connected with the lower end inner wall of valve body 1.

For leakage problem, hair caused by the prior art, controlling valve element easily to occur damming inaccurately when in use It is bright that existing valve element is improved, on the premise of control valve element flexible modulation is ensured, improve damming precisely for control valve element Degree, to ensure measuring accuracy of the liquid chlorine in filling process, what the loss for reducing liquid chlorine improved liquid chlorine simultaneously fills efficiency；Use When, liquid chlorine runner is provided with valve body 1, and the horizontal positioned of valve seat 4 of U-shaped is arranged on the middle part of liquid chlorine runner so that valve body 1 Import 2 is connected by be opened on valve seat 4 two connection cavitys 5 with exporting 7, before filling, conical section 63 with connect the wall of cavity 5 Contact, while fixture block 64 cooperates with draw-in groove 51 so that two connect cavitys 5 and realize primary seal, and the lower end of conical section 63 Sealing ring 65 on face then realizes connecting the secondary seal of the lower ending opening of cavity 5, by primary seal and secondary seal so that Liquid chlorine runner is insulated into two parts completely, to maintain to control valve element to liquid chlorine storage tank and extraneous isolation effect；When filling, Liquid chlorine is flowed into the first paragraph runner constituted between the inwall of U-shaped valve seat 4 and import 2 by import 2, now stirs valve rod 61, So that conical section 63 be gradually disengaged between the wall of cavity 5 with being connected, gap of the liquid chlorine then between connection cavity 5 and conical section 63 is entered Enter in the second segment runner constituted between the outer wall of U-shaped valve seat 4 and outlet 7, eventually pass outlet 7 and be injected into transfer cask body. By the reciprocating motion of the in the vertical direction of valve rod 61, you can realize the connection and opening and closing between liquid chlorine storage tank and transfer cask, enter And quickly realize the precise control of liquid chlorine flow during liquid chlorine filling, it is to avoid damming not in time or dam precision because of liquid chlorine Differ from and cause the leakage of liquid chlorine, to reach the flexible modulation for ensureing liquid chlorine when filling, improve the purpose of the measuring accuracy of liquid chlorine.

Wherein, move on the valve rod 61 until conical section 63 with connect after the inwall of cavity 5 completely disengages from, liquid chlorine is quickly through company Cavity body 5 is flowed into second segment runner by first paragraph runner, and now the liquid chlorine in first paragraph runner can be because of connection above The lower ending opening internal diameter of cavity 5 it is smaller and select it is underlying connection cavity 5 in flow out, and in first paragraph runner the overwhelming majority Liquid chlorine can form intense impact to the inwall of valve body 1 of the connection lower ending opening of cavity 5 for being just pointed to lower section in second segment runner, The inwall of valve body 1 can be caused to be subject to sharp impacts and be damaged when serious, inventor is provided with two just to connection chamber on valve rod 61 The baffle 66 of the lower ending opening of body 5, and the epimere external diameter of the baffle 66 successively decreases upward along the axis of valve rod 61, i.e., in connection chamber The lower end of body 5 forms a coniform guide face so that the liquid chlorine in first paragraph runner is again divided into two plumes and goes out, i.e., and first Stock liquid chlorine flows out at the guiding lower edge of the guide face lower ending opening of connection cavity 5 above, and second burst of liquid chlorine edge is located at Flowed out at the lower ending opening of connection cavity 5 of lower section, and second burst of liquid chlorine leading in guide face after flowing into second segment runner Draw and lower spread apart to surrounding, it is to avoid to a little carrying out constant impingement on the inwall of valve body 1, and then receiving for the inwall of valve body 1 can be reduced Loss rate, while ensure that the flow that two strands of liquid chlorines in second segment runner are branched to by first paragraph runner tends to balance, to ensure valve The stress equalization of upper and lower two parts in body 1, it is to avoid the lower section excessive wear of the inwall of valve body 1 and reduce its service life.

Further, retreat stop block is additionally provided with inside valve body 1, the upper surface of retreat stop block is provided with the retaining hole just to valve rod 61 3, during valve rod 61 is moved down, the end of valve rod 61 can move along a straight line along retaining hole 3, it is to avoid liquid chlorine is when filling to valve Bar 61 and conical section 63 are impacted and cause valve rod 61 that circular runout occurs, to improve the control accuracy of insert body 6.Its In, liquid chlorine cut-off sealing is realized by the cooperation between valve element and valve seat 4 in valve body 1, and the drive part of valve rod 61 is same Easily there is leakage, therefore inventor, in the upper surface fixed support body 11 of valve body 1, the upper end of supporter 11 is fixed with supporting plate 13, the supporting plate 13 is used to install the driver parts such as cylinder, and the upper end of valve rod 61 is provided with drive rod 9, and in supporter 11 Portion is provided with cavity, and cavity is interior to be filled with filler 10, the cavity that activity runs through in supporter 11 successively of drive rod 9 and supporting plate 13 After upwardly extend, until be connected with the output end of driver part, similarly, sealing gasket 8 is installed in the lower end of supporter 11, this is close Packing 8 can open isolation between the lower end of drive rod 9 and cavity, by sealing gasket 8 with filler 10 to the dual close of drive rod Envelope, can avoid the liquid chlorine in valve body 1 from being leaked through at the driver part of valve element, also, in the connection of supporting plate 13 and supporter 11 Place is provided with axle sleeve 12, and the activity of drive rod 9 runs through the axle sleeve 12, to ensure that drive rod 9 is connected with driver part output end After can realize pumping under air-proof condition.And organ cover 32 is installed on the lower end outer wall of valve rod 61, the organ Cover 32 completely cuts off retaining hole 3 and the inside of valve body 1 to be opened, when valve rod 61 is moved down, organ cover 32 compressed and with valve rod 61 in the lump under Move, and be arranged on the spring 31 in retaining hole 3 then using the elastic force produced by the deformation of itself and deformation recovery to valve rod 61 Movement tendency enter row buffering, to reduce impact of the valve rod 61 to retaining hole 3 and the inwall of valve body 61, it is to avoid valve rod 61 is rushed Hit and influence the sealing between conical section 63 and valve seat 4.

The width of the fixture block 64 successively decreases downwards along the axis direction of the valve rod 61.Fixture block 64 makes with the cooperation of draw-in groove 51 Obtain conical section 63 and connect the contact area increase between the wall of cavity 5, that is, increase the sealing effectiveness of primary seal, while fixture block 64 Width successively decrease downwards along the axis direction of valve rod 61, similarly connect the wall of cavity 5 on the groove width of draw-in groove 51 also along valve rod 61 Axis direction successively decreases downwards, i.e., can reduce the liquid chlorine residual quantity in draw-in groove 51, and fixture block when being blocked to liquid chlorine runner 64 in the contact process of draw-in groove 51, and the deformation quantity that fixture block 64 is squeezed and occurs can be gradually reduced in the groove width of draw-in groove 51 It is restricted in part, i.e., the interaction force between fixture block 64 and draw-in groove 51 is passed along valve rod 61 axially direction directed downwardly Increase, and then increase the sealing effectiveness of primary seal.

Preferably, the longitudinal cross-section of sealing ring 65 is U-shaped, i.e., in the folding process of valve rod 61, sealing ring 65 is gradually Lower ending opening with connection cavity 5 is contacted, until draw-in groove 51 agrees with completely with fixture block 64, valve rod 61 stops movement, now seals Ring 65 there is certain deformation and the lower end to connecting cavity 5 realize secondary seal, and longitudinal cross-section for U-shaped sealing ring 65 with When connection cavity 5 occurs mutually to extrude, the deformation of the outer circumference of sealing ring 65 possesses certain deformation by its U-shaped portion point Space, that is, prevent the part that sealing function is played on sealing ring 65 not result in internal action stress concentration and be damaged, with true The stability of secondary seal is protected, while extending the service life of sealing ring 65.

Preferably, liquid chlorine possesses active chemical property, corrosivity, the general rubber as sealing medium are provided simultaneously with Service life of the glue material under liquid chlorine environment is shorter, the phenomenon for hardening cracking easily occur, and inventor selects polytetrafluoroethyl-ne Alkene material as fixture block 64 and the raw material of sealing ring 65, using its good decay resistance, to ensure in control valve Ensure the stability of primary seal and secondary seal, while extending the service life of fixture block 64 and sealing ring 65, reduce control The frequency that valve inner part processed is changed.

Above-described specific embodiment, is entered to the purpose of this utility model, technical scheme and beneficial effect One step is described in detail, be should be understood that and be the foregoing is only specific embodiment of the present utility model, is not used to limit Fixed protection domain of the present utility model, all any modifications within spirit of the present utility model and principle, made, equally replaces Change, improve, should be included within protection domain of the present utility model.

Claims (1)

1. liquid chlorine runner is provided with a kind of pressure-control valve, including valve body (1) and valve element, valve body (1), and valve body (1) both sides are provided with Respectively with the import (2) and outlet (7) of liquid chlorine flow passage, it is characterised in that：The valve element include insert body (6) and with Cooperation U-shaped valve seat (4), installed in the middle part of liquid chlorine runner, valve seat (4) is by the liquid chlorine for the valve seat (4) of horizontal positioned U-shaped , into first paragraph runner and second segment runner, the insert body (6) is including valve rod (61) and is disposed on valve rod for channel partition (61) two sprues (62) on, are provided with the circle that external diameter successively decreases downwards along valve rod (61) axis direction on sprue (62) lower surface Cone section (63), conical section (63) is set on the outer circle wall of valve rod (61), valve seat (4) horizontal positioned, and in valve seat (4) Two vertical sections on be provided with the connection cavity (5) being engaged with conical section (63), valve rod (61) is vertically through described in two Connection cavity (5), is circumferentially being provided with multiple fixture blocks (64), in connection cavity (5) on its external wall along the conical section (63) Multiple draw-in grooves (51) being adapted with the fixture block (64) are provided with wall, sealing is fixed with the lower surface of the conical section (63) Ring (65), the internal diameter of the external diameter more than described connection cavity (5) lower ending opening of the sealing ring (65)；On the valve rod (61) Two are provided with just to the baffle (66) of connection cavity (5) lower ending opening, baffle (66) the epimere external diameter is along the valve rod (61) axis successively decreases upwards；Supporter (11) is installed in valve body (1) upper end, supporting plate (13) is fixed on supporter (11) upper end Face, cavity is provided with supporter (11) middle part, and drive rod (9) is provided with valve rod (61) upper end, and the drive rod (9) activity is passed through Wear the cavity, supporting plate to be upwardly extended after (13), filler (10) is provided with the cavity, also set inside valve body (1) There is retreat stop block, the upper surface of retreat stop block is provided with the retaining hole (3) just to valve rod (61) bottom, the peace in the retaining hole (3) Equipped with spring (31), it is fixed with the outer wall of the valve rod (61) lower end under organ cover (32), and the organ cover (32) End is connected with valve body (1) lower end inner wall；The width of the fixture block (64) successively decreases downwards along the axis direction of the valve rod (61)；Institute The longitudinal cross-section for stating sealing ring (65) is the U-shaped of horizontal positioned；The fixture block (64) and sealing ring (65) use polytetrafluoro Ethene material.