CN208734901U - A kind of butterfly valve - Google Patents

Abstract

The utility model discloses a kind of butterfly valves, belong to valve technology field.A kind of butterfly valve, including valve body, form runner in valve body, are rotatably provided with flap by valve rod assembly in runner；Flap includes left flap and right flap.It is provided with sealing ring between left flap and right flap, the inner wall of runner is provided on the outside of sealing ring；Be additionally provided with a driving assembly on valve body, driving assembly drives right flap close to or far from left flap, left flap and right flap it is close to each other and squeeze sealing ring to a certain degree when, sealing ring expands outwardly the inner wall for being deformed into sealing runner.Left flap is fixed with valve rod assembly, and right flap is moving member；When runner is sealed, right flap is towards liquid feeding end.By the movement of flap to squeeze sealing ring and make sealed ring deformation to achieve the effect that sealing.The utility model by two inclined-planes overstock the displacive transformation of valve rod in the vertical direction pair is become into the movement of flap in the horizontal direction to realize the deformation of sealing ring.

Description

A kind of butterfly valve

Technical field

The utility model belongs to valve technology field, refers in particular to a kind of butterfly valve.

Background technique

Currently, butterfly valve is called flap valve, it is a kind of simple regulating valve of structure, can be used for the switch control of low pressure pipeline medium The butterfly valve of system refers to that closure member flap or butterfly plate are disk, and a kind of valve of open and close is reached around valve shaft rotation.From valve For the angle of door, how to realize that sealing anti-leak is important index.Especially when butterfly valve is applied in water pipe, just More require emphasis sealing performance.

Chinese invention patent, Patent No.: 201410740602.0, the present invention is a kind of internal channel gas-flow closure butterfly valve, It is to the heavy caliber gas-flow closure butterfly valve significant improvement applied before.Including valve body, valve rod and the valve being made of valve plate and valve seat Core.Valve body is both ends of the surface band flange cylinder, and top and bottom set axle sleeve and valve foot respectively, and inner peripheral wall sets ring-shaped valve seats.Valve plate Outer rim sets inflatable seal cushion rubber, forms sealing relationship with valve seat.Valve rod is set among valve body, upper end sets inflation gas check valve, on Section sets inflation internal channel along central axes direction, laterally sets air inlet, internal channel is communicated with air inlet.It is set between axle sleeve and valve rod close Seal ring.Valve plate is made of pressing ring, sealing rubber ring and disc bottom plate, and inflatable seal cushion rubber, shape are accompanied between pressing ring and bottom plate At the state of holding one's breath.Original is located at charge valve outside valve body by this product, gas tube is changed to inflation internal channel, not only save the cost, and Moulded succinct, installation or carrying will not damage ring air charging system, and tracheae tie point is reduced, and make sealing performance more preferably, when pressure maintaining Between it is longer.

In above-mentioned technical proposal, by being inflated inside cushion rubber to realize the function of sealing.But it was actually using Cheng Zhong, if being sealed using inflatable, if once some position of cushion rubber has holes to result in entire cushion rubber thorough It scraps, and such design is also inconvenient when replacing cushion rubber in the later period, leads to the inconvenience in later period maintenance.

Utility model content

The purpose of the utility model is to provide a kind of good seal performance, stable structure, easy to assembly, butterflies with long service life Valve.

Purpose of the utility model is realized as follows: a kind of butterfly valve, including valve body, runner is formed in the valve body, Flap is rotatably provided with by valve rod assembly in runner；The flap includes left flap and right flap.

Preferably, it is provided with sealing ring between the left flap and right flap, is provided with the runner on the outside of sealing ring Inner wall；A driving assembly is additionally provided on the valve body, driving assembly drives the right flap close or far from left flap, left Flap and right flap it is close to each other and squeeze sealing ring to a certain degree when, the sealing ring, which expands outwardly, to be deformed into described in sealing The inner wall of runner.

Preferably, the left flap is fixed with the valve rod assembly, and the right flap is moving member；The runner is sealed When, right flap is towards liquid feeding end.

Preferably, the left flap and right flap have been separately formed a left groove and right groove, left groove and right groove it Between be installed with the sealing ring.

Preferably, the valve rod assembly, which includes at least, a stem body；A clamping is formed on the left of the right flap Column, the side of clip-connecting rod form clamping groove, the first inclined surface are formed on the left of clamping groove；The lower end of the stem body Across the clamping groove and the second inclined surface is formed, the upper end of the second inclined surface is provided with first inclined surface；It is described Stem body is moved up and down by driving device and the second inclined surface driving is made to be resisted against on the first inclined surface and drive The right flap is mobile.

Preferably, the driving device includes locker, forms threaded hole in locker, the stem body it is upper End forms the threaded post being adapted to the threaded hole.

Preferably, the left flap right inward forms horizontally disposed accommodating hole, and the clip-connecting rod is in accommodating hole Slidably it is arranged；The left flap forms a mounting hole, the stem body in the vertical direction of the accommodating axially bored line It wears in the mounting hole.

Preferably, the cross sectional shape of the mounting hole is polygon, and the lower end of the valve rod forms and the installation The forced section of hole shape adaptation.

Preferably, the valve rod assembly further includes having a valve pocket；The stem body upper end is provided with valve handle, valve handle one End forms polygonal hole；The valve pocket is set between the valve handle and the stem body, the cross sectional shape of valve pocket outer rim with The polygonal hole cross sectional shape adaptation.

Preferably, the valve body upper end is installed with one division disk, several indexing teeth are formed on index dial；Described point The valve pocket is also equipped in scale；Stem body lower end liftable is provided with handle tooth and passes through handle tooth and the indexing tooth Adaptation.

Preferably, the valve handle includes sleeve and the shank that is arranged in sleeve, forms a fulcrum, institute in the middle part of shank Stating shank can be rotatably provided in the sleeve around the fulcrum；Described shank one end forms the handle tooth, the handle The bar other end forms the hand-held part for facilitating gripping and increasing stroke.

Preferably, flanging is formed in the middle part of the valve pocket, the upper surface of the left flap is resisted against the flanging Lower end.

Preferably, the outer rim of the left flap upper end is arranged with axle sleeve, and it is close that the upper and lower ends of axle sleeve pass through third respectively Seal is resisted against the lower end and left flap upper end of the valve pocket.

Preferably, the valve body lower end portion forms valve seat mounting hole, fits in valve seat mounting hole and is equipped with a butterfly valve seal Seat, the upper end of butterfly valve seal seat is resisted against the lower end of the left flap.

Preferably, the left flap forms mounting hole；Butterfly valve seal seat upper end forms a Step Shaft, step Axis upper end wear in the mounting hole and be provided between the Step Shaft upper end and the mounting hole several first Sealing ring；The second sealing ring is provided between the butterfly valve seal seat and the valve seat mounting hole.

Preferably, the butterfly valve seal seat and the valve body by fastener sequentially pass through from the bottom to top butterfly valve seal seat and Valve body is fastenedly connected to realize.

Compared with the prior art, the utility model has prominent and beneficial technical effects that:

1. the utility model by the way that a sealing ring is arranged between two flaps, is squeezed close by the movement of flap Seal simultaneously makes sealed ring deformation, and deformed sealing ring is resisted against in runner inner wall, to achieve the effect that sealing.And After one of flap is mobile, sealing ring can naturally have a kind of restorable trend, to realize circulation again Purpose.Such design service life is long, and assembly is simple, easy to use.

2. the utility model overstocks to become the displacive transformation of valve rod in the vertical direction pair by two inclined-planes The movement of flap in the horizontal direction, to realize the deformation of sealing ring.Butterfly valve itself is adequately utilized in such design Structure, valve rod is slightly reequiped it is achieved that very convenient quick.

3. the utility model further increases sealing effect by increasing multiple sealing rings on valve body and left flap Fruit.And it may be implemented to include the effect for fixing other component again while increasing sealing ring.The clever structure of design, simultaneously It can guarantee good sealing performance.

Detailed description of the invention

Fig. 1 is the structure diagram of the utility model；

Fig. 2 is the structure diagram after Fig. 1 omission valve body；

Fig. 3 is the perspective view of the explosion of Fig. 2；

Fig. 4 is that Fig. 2 omits structure diagram after left flap；

Fig. 5 is the partial enlarged view in Fig. 4 at A；

Fig. 6 is the structure diagram of right flap；

Fig. 7 is the structure diagram of left flap；

Fig. 8 is the structure diagram of stem body；

Fig. 9 is the structure diagram of valve body；

Figure 10 is the assembling schematic diagram of butterfly valve seal seat and left flap；

Figure 11 is the structure diagram of embodiment two；

Figure 12 is the structure diagram of embodiment three；

Figure 13 is the structure diagram of example IV；

Figure 14 is the structure diagram of embodiment five.

In figure: 1- valve body；2- stem body；The left flap of 3-；The right flap of 4-；5- sealing ring；6- locker；7- valve handle；8- Valve pocket；9- index dial；10- gear；11- runner；12- valve seat mounting hole；13- butterfly valve seal seat；14- Step Shaft；15- first is close Seal；The second sealing ring of 16-；17- drag-line；18- pulley；19- power source；The second inclined surface 21-；22- forced section；23- rack gear Portion；24- piston component；25- cable connector；26- forced section；27- engaging section；31- accommodating hole；32- mounting hole；33- axle sleeve； 34- third sealing ring；35- left groove；41- clip-connecting rod；42- clamping groove；The first inclined surface 43-；44- rack gear region of engagement；45- is right Groove；61- threaded hole；71- polygonal hole；72- handle tooth；73- sleeve；74- shank；The hand-held part 75-；81- flanging；91- points Spend tooth；101- hydraulic punch pressure area；102- pressure-bearing pulley；103- lift pressure lever；104- lift pressure cabinet.

Specific embodiment

The utility model is described further with specific embodiment below.

Embodiment one: as Figure 1-10 shows, a kind of butterfly valve, including valve body 1 forms runner 11, runner in the valve body 1 Flap is rotatably provided with by valve rod assembly in 11；The flap includes left flap 3 and right flap 4.

A kind of structure of butterfly valve is specifically illustrated in the technical program.The rotation of flap is realized by rotation valve rod component, Then flap is divided into left and right two parts again, in this way can during later maintenance enhanced convenience, while can also reduce Manufacturing cost.Connection between left flap 3 and right flap 4 can be to be also possible to pass through bolt by shaft hole matching connection Connection is also possible to connect by clamping, it might even be possible to which, in the case where considering usage scenario, left flap 3 and right flap 4 can To be connected by glue.It is wherein butterfly valve technical field conventional techniques using valve rod assembly driving flap rotation, here not It repeats more.

Preferably, it is provided with sealing ring 5 between the left flap 3 and right flap 4, the stream is provided on the outside of sealing ring 5 The inner wall in road 11；A driving assembly is additionally provided on the valve body 1, driving assembly drives the right flap 4 close or separate Left flap 3, left flap 3 and right flap 4 it is close to each other and squeeze sealing ring 5 to a certain degree when, the sealing ring 5 expands outwardly It is deformed into the inner wall for sealing the runner 11.

A kind of sealing for realizing butterfly valve using sealing ring 5 in butterfly valve technical field is specifically illustrated in the technical program Mode.More preferable leakproofness can be possessed compared to that technical solution described in this technology background in this manner, and And more stable can facilitate maintenance in actual use, and can have higher service life, it will not be with right It is more the same than technical solution described in file, there is a small cut to result in entire butterfly valve work not normal.

Left and right directions described in the technical program is intended merely to an orientation for facilitating description given, is actually using In the process, left flap 3 is also possible to realize mobile by driving assembly so that sealing ring 5 deforms.Drive described in the technical program Dynamic component can be the presence of diversified forms, can be used cylinder or hydraulic cylinder is connected to the one end of right flap 4, pass through The mode of dragging realizes the movement of right flap 4；It is also possible to by allowing fastener to sequentially pass through left flap 3 and right flap 4, then Left 3 side of flap, from fastener one end, rotation sets a nut, forces right flap 4 mobile by rotating nuts.Certainly pass through driving group Part realizes that the mode of the movement of right flap 4 there are also very much, different one illustrates here.

Preferably, the left flap 3 is fixed with the valve rod assembly, and the right flap 4 is moving member；11 quilt of runner When sealing, right flap 4 is towards liquid feeding end.

A kind of a kind of mode of butterfly valve in actual use is specifically illustrated in the technical program.By allowing right flap 4 are built up in the position of liquid feeding end, in this way can be more laborsaving during locking, and need depressurization state when Wait, not only can use sealing ring 5 itself restore that power depressurization but also can be by allowing water flow to flow through the right side It when flap 4, is acted on by a hydraulic pressure, the reinstatement of sealing ring 5 is helped speed up, so as to realize more preferable depressurization Effect.Liquid feeding end described in the technical program and outlet end can be understood as water flow or air-flow is come in from liquid feeding end, so It is come out afterwards from outlet end.

Preferably, the left flap 3 and right flap 4 have been separately formed a left groove 35 and right groove 45,35 He of left groove The sealing ring 5 is installed between right groove 45.

A kind of mounting means of sealing ring 5 is specifically illustrated in the technical program, passes through left groove 35 and right groove 45 Design not only can with fixed seal ring 5 again can with pinch seal circle 5 increase sealing ring 5 deflection.

Preferably, the valve rod assembly, which includes at least, a stem body 2；The left side of the right flap 4 forms a card Column 41 is connect, the side of clip-connecting rod 41 forms clamping groove 42, and the left side of clamping groove 42 forms the first inclined surface 43；The valve rod The lower end of main body 2 passes through the clamping groove 42 and forms the second inclined surface 21, and the upper end of the second inclined surface 21 is provided with First inclined surface 43；The stem body 2 is moved up and down by driving device and second inclined surface 21 is driven It is resisted against on the first inclined surface 43 and drives the right flap 4 mobile.

A kind of mode for driving right flap 4 mobile is specifically illustrated in the technical program.Being also possible to preferably is above-mentioned One of implementation of driving assembly.In the technical scheme, moving up and down so as to driving second by flap Inclined surface 21 is resisted against the lower end of the first inclined surface 43, so as to realize that moving up and down for stem body 2 is transformed into flap Move left and right.Driving device described in the technical program can be through manpower and drop, be also possible to through cylinder or Hydraulic cylinder is come the mode and structure that drag or other are any can to make stem body 2 move up and down.

Preferably, the driving device includes locker 6, and threaded hole 61, the stem body are formed in locker 6 2 upper end forms the threaded post being adapted to the threaded hole 61.

A kind of structure of driving device is specifically illustrated in the technical program, and the mode being connected through a screw thread realizes driving, It is not only laborsaving but also be particularly suitable for the use in actual scene.Because butterfly valve is often mounted in pipeline in actual scene, Thus best adjustment mode is exactly by being adjusted outside pipeline.This portion of stem body 2 is thus provided in butterfly valve Part similarly in the technical scheme forces the rotation of stem body 2, by the rotation of locker 6 so as to realize in pipe The movement of right flap 4 can be driven outside road, it is very simple and clear, especially meet actual production demand.

Preferably, 3 right inward of left flap forms horizontally disposed accommodating hole 31, and the clip-connecting rod 41 is accommodating Slidably it is arranged in hole 31；The left flap 3 forms a mounting hole 32, institute in the vertical direction of 31 axis of accommodating hole Stem body 2 is stated to be threaded through in the mounting hole 32.

The fit system between a kind of left flap 3 and right flap 4, the cooperation side of axis hole is specifically illustrated in the technical program Formula can preferably realize connection between the two, and the movement of right flap 4 can be allowed most in actual use It is possible to be moved horizontally towards left 3 side of flap.It thus can preferably realize the deformation of sealing ring 5.The technical program simultaneously A kind of mounting means of stem body 2 is also specifically illustrated, such design can allow the design of butterfly valve entirety more complete It is coherent, there is stronger working strength, be able to bear more hydraulic pressure.

Preferably, the cross sectional shape of the mounting hole 32 is polygon, and the lower end of the stem body 2 forms and institute State the forced section 26 of 32 shape adaptation of mounting hole.

A kind of shape of mounting hole 32 is specifically illustrated in this technology, and the purpose for designing polygon is to provide a kind of driving valve The mode of valve rotation.The design of polygon can allow the rotation of stem body 2 that can become the rotation of flap, and such design is more Add easily and effectively.And polygon described in the technical program can be triangle or quadrangle or other polygons.And four For side shape especially square because materials are convenient, structure is simple, and uniform force is stablized, and is preferably polygon in the technical program Shape shape.Adaptation described in the technical program, he means on the rotation energy and flap of the polygon on stem body 2 Polygon, which rotates, can generate the transmitting of power, that is to say, that the polygon on polygon and flap on stem body 2 can all be The same quadrilateral structure is also possible to the cooperation of a triangle and quadrangle, and the mode cooperated here is varied, just not It repeats more.

Preferably, the valve rod assembly further includes having a valve pocket 8；2 upper end of stem body is provided with valve handle 7, valve 7 one end of handle forms polygonal hole 71；The valve pocket 8 is set between the valve handle 7 and the stem body 2,8 outer rim of valve pocket Cross sectional shape is adapted to 71 cross sectional shape of polygonal hole.

A kind of design scheme that valve is bright, the rotation that the design of polygon can allow valve bright is specifically illustrated in the technical program Become the rotation of stem body 2, valve is bright because there is longer torque, can be more by the rotation of the bright driving stem main body 2 of valve Add laborsaving.And the polygonal design that valve is bright and stem body 2 is adapted to, rotation can be allowed to be more uniformly stressed and more can be by Power.Adaptation described in the technical program, he means polygon on the rotation energy and flap of the polygon on stem body 2 Shape rotates the transmitting that can generate power, that is to say, that the polygon on polygon and flap on stem body 2 can be just as Quadrilateral structure, be also possible to the cooperation of a triangle and quadrangle, the mode cooperated here is varied, just few superfluous It states.

Preferably, 1 upper end of valve body is installed with one division disk 9, several indexing teeth 91 are formed on index dial 9； The valve pocket 8 is also equipped in the index dial 9；The 7 lower end liftable of valve handle be provided with handle tooth 72 by handle tooth 72 with The indexing tooth 91 is adapted to.

The technical program specifically describes a kind of design scheme of index dial 9.It can be more by the design of index dial 9 The accurately angle of control rotation.

Preferably, the valve handle 7 includes sleeve 73 and the shank 74 that is arranged in sleeve 73, is formed in the middle part of shank 74 One fulcrum, the shank 74 can be rotatably provided in the sleeve 73 around the fulcrum；Described 74 one end of shank forms The handle tooth 72,74 other end of shank form the hand-held part 75 for facilitating gripping and increasing stroke.

A kind of structure type of valve handle 7 is specifically illustrated in the technical program.The knot of valve handle 7 described in the technical program Structure in actual use, can press hand-held part 75 then by lever principle by hand, and 72 one end of driving handle tooth moves downward, To which handle tooth 72 and indexing tooth 91 are detached from, so as to be detached from.It can be by handle tooth 72 when needing using index dial 9 Be engaged use of the realization to index dial 9 with indexing tooth 91, also against having for driving between general sleeve 73 and shank 74 The spring that shank 74 resets.

Preferably, flanging 81 is formed in the middle part of the valve pocket 8, the upper surface of the left flap 3 is resisted against described turn up The lower end on side 81；The outer rim of 3 upper end of left flap is arranged with axle sleeve 33, and the upper and lower ends of axle sleeve 33 pass through third respectively Sealing ring 34 is resisted against 3 upper end of lower end and left flap of the valve pocket 8.

The technical program is specifically illustrated a kind of locating scheme of valve pocket 8, and such design can allow the position of valve pocket 8 Firmly it is located in the upper end of left flap 3.In actual use, left 3 upper end of flap is the process for having a size to become smaller, Axle sleeve 33 is stuck in this position to become smaller, and sealing ring then is arranged in the upper and lower ends of axle sleeve 33 again, thus can realize Positioning, in turn ensures sealing performance.

Preferably, 1 lower end of valve body forms valve seat mounting hole 12, fits in valve seat mounting hole 12 and is equipped with a butterfly valve Seal receptacle 13, the upper end of butterfly valve seal seat 13 are resisted against the lower end of the left flap 3；The left flap 3 forms installation Hole 32；13 upper end of butterfly valve seal seat forms a Step Shaft 14, and 14 upper end of Step Shaft is threaded through the mounting hole 32 Several the first sealing rings 15 are provided between interior and described 14 upper end of Step Shaft and the mounting hole 32；The butterfly valve seal The second sealing ring 16 is provided between seat 13 and the valve seat mounting hole 12；The butterfly valve seal seat 13 passes through with the valve body 1 Fastener sequentially passes through butterfly valve seal seat 13 and valve body 1 from the bottom to top and is fastenedly connected to realize.

The technical program is specifically illustrated a kind of lower end in left flap 3 and a butterfly valve seal seat 13 is arranged, thus It can be realized the positioning action to left flap 3.It ensure that butterfly valve seal seat further through the first sealing ring 15 and the second sealing ring 16 Sealing between 13 and valve body 1 and butterfly valve seal seat 13 and left flap 3.It can be connected through a screw thread again simultaneously and realize that butterfly valve is close Seal the positioning of seat 13.The structure of entire butterfly valve thus can be preferably allowed to connect more firm.

Embodiment two, as shown in figure 11, the present embodiment and embodiment one are almost the same, and difference is: about driving The specific structure mode of component is different.Preferably, 2 lower end of stem body forms tooth-strip part 23,23 side of tooth-strip part adaptation There is gear 10,10 lower end of gear is provided with the rack gear region of engagement 44 of right flap 4, and rack gear region of engagement 44 and the gear 10 are suitable Match.So as to by between tooth-strip part 23 and gear 10 and rack gear region of engagement 44 and the gear 10 between " gear Rack gear cooperation " is hereby, it is achieved that moving up and down for stem body 2 is changed into moving left and right for right flap 4.So as to realize left valve Close, the extruding realization sealing of sealing ring 5 of valve 3 and right flap 4.

Embodiment three, as shown in figure 12, the present embodiment and embodiment one are almost the same, and difference is: about driving The specific structure mode of component is different.Preferably, piston component 24 is provided in stem body 2,24 lower end of piston component is set It is equipped with hydraulic punch pressure area 101, right 4 side of flap forms clip-connecting rod 41, and clip-connecting rod 41 can be slided by piston component 24 It is dynamic to be arranged in the hydraulic punch pressure area 101.The technical program is moved up and down by piston component 24 to change hydraulic stamping The pressure of hydraulic oil in area 101, so that clip-connecting rod 41 be driven to move left and right, so as to realize left flap 3 and right flap 4 It is close, it squeezes sealing ring 5 and realizes sealing.

Example IV, as shown in figure 13, the present embodiment and embodiment one are almost the same, and difference is: the valve rod 2 upper end of main body is connected with drag-line 17, and drag-line 17, which passes through, to be arranged in the dragging realization of the power source 19 of 18 side of pulley and allow valve rod The movement of main body 2 in the vertical direction.Such side provides a biggish pulling force and pulls to stem body 2, especially suitable For the biggish scene of pressure.

Embodiment five, as shown in figure 14, the present embodiment and embodiment one are almost the same, and difference is: stem body 2 Upper end is connected with drag-line 17, and drag-line 17 is by a pressure-bearing pulley 102 and is wrapped on pressure-bearing pulley 102, pressure-bearing pulley 102 1 Side is connected with lift pressure lever 103；The pressure-bearing pulley 102 is installed in pressure-bearing cabinet 104.

In actual use, by lifting or pushing lift pressure lever 103, so that the rotation of pressure-bearing pulley 102 is driven, And then drag-line 17 can be rotated around driving pressure-bearing pulley 102, and then driving stem main body 2 moves up and down, to realize Sealing function described in the utility model.The present embodiment is somewhat like with example IV, and difference is to drive the side of drag-line 17 Formula is different.

Above-described embodiment is only the preferred embodiment of the utility model, not limits the protection model of the utility model according to this It encloses, therefore: the equivalence changes that all structures, shape, principle according to the utility model are done should all be covered by the protection of the utility model Within the scope of.

Claims (10)

1. a kind of butterfly valve, including valve body (1), it is characterised in that: formed runner (11) in the valve body (1), in runner (11) Flap is rotatably provided with by valve rod assembly；The flap includes left flap (3) and right flap (4)；The valve rod assembly It further include having a valve pocket (8).

2. butterfly valve according to claim 1, it is characterised in that: be provided between the left flap (3) and right flap (4) close Seal (5), sealing ring (5) outside are provided with the inner wall of the runner (11)；A driving group is additionally provided on the valve body (1) Part, driving assembly drive the right flap (4) close or far from left flap (3), and left flap (3) and right flap (4) mutually lean on It is close and squeeze sealing ring (5) to a certain degree when, the sealing ring (5), which expands outwardly, is deformed into the interior of the sealing runner (11) Wall.

3. butterfly valve according to claim 2, it is characterised in that: the left flap (3) is fixed with the valve rod assembly, described Right flap (4) is moving member；When the runner (11) is sealed, right flap (4) is towards liquid feeding end.

4. butterfly valve according to claim 2 or 3, it is characterised in that: the valve rod assembly, which includes at least, a stem body (2)；It is formed a clip-connecting rod (41) on the left of the right flap (4), the side of clip-connecting rod (41) forms the first inclined surface (43)；The lower end of the stem body (2) forms the second inclined surface (21)；The stem body (2) passes through driving device It moves up and down and the second inclined surface (21) driving is made to be resisted against on the first inclined surface (43) and drive the right flap (4) It is mobile.

5. butterfly valve according to claim 4, it is characterised in that: the driving device includes locker (6), locker (6) it is formed threaded hole (61) in, the upper end of the stem body (2) forms the screw thread being adapted to the threaded hole (61) Column (22).

6. butterfly valve according to claim 4, it is characterised in that: left flap (3) right inward forms horizontally disposed Accommodating hole (31), the clip-connecting rod (41) is slidably arranged in the accommodating hole (31)；The left flap (3) is in the accommodating hole (31) it is formed in the vertical direction of axis a mounting hole (32), the stem body (2) is threaded through in the mounting hole (32).

7. butterfly valve according to claim 6, it is characterised in that: the cross sectional shape of the mounting hole (32) is polygon, institute The lower end for stating stem body (2) forms forced section (26) with the mounting hole (32) shape adaptation.

8. butterfly valve according to claim 1, it is characterised in that: stem body (2) upper end is provided with valve handle (7), Valve handle (7) one end forms polygonal hole (71)；The valve pocket is set between the valve handle (7) and the stem body (2) (8), the cross sectional shape of valve pocket (8) outer rim is adapted to the polygonal hole (71) cross sectional shape.

9. butterfly valve according to claim 8, it is characterised in that: valve body (1) upper end is installed with one division disk (9), Several indexing tooth (91) are formed on index dial (9)；The valve pocket (8) are also equipped in the index dial (9)；The valve handle (7) lower end liftable is provided with handle tooth (72) and is adapted to by handle tooth (72) with the indexing tooth (91).

10. butterfly valve according to claim 9, it is characterised in that: the valve handle (7) includes sleeve (73) and is arranged in handle The shank (74) in (73) is covered, a fulcrum is formed in the middle part of shank (74), the shank (74) can be rotated around the fulcrum Setting is in the sleeve (73)；Described shank (74) one end forms the handle tooth (72), shank (74) other end at Type has the hand-held part (75) for facilitating gripping and increasing stroke.