CN104964044A - Double eccentric butterfly valve - Google Patents
Double eccentric butterfly valve Download PDFInfo
- Publication number
- CN104964044A CN104964044A CN201510369441.3A CN201510369441A CN104964044A CN 104964044 A CN104964044 A CN 104964044A CN 201510369441 A CN201510369441 A CN 201510369441A CN 104964044 A CN104964044 A CN 104964044A
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- Prior art keywords
- valve
- valve seat
- pedestal
- butterfly
- valve body
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
- F16K1/427—Attachment of the seat to the housing by one or more additional fixing elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
- F16K27/0218—Butterfly valves
Abstract
The invention discloses a double eccentric butterfly valve. The double eccentric butterfly valve comprises a valve body, a valve rod inserted in an inner cavity of the valve body in a sealing mode, and a sealing valve seat located between a butterfly plate and the valve body. The valve rod rotates through external force so as to drive the butterfly plate to rotate, and the butterfly plate and the sealing valve seat are separated or closed. The double eccentric butterfly valve further comprises a base fixed to the part, on the medium flow-in side, of the valve body, and an installing space is formed between the base and the part, on the medium flow-in side, of the valve body. The sealing valve seat is located in the installing space and arranged on the base, and the deformation in the direction of the butterfly plate under the ultra-low temperature is defined by the base. Under the ultra-low temperature, the butterfly plate and the sealing valve seat both shrink and deform, the deformation, in the direction of the butterfly plate, of the sealing valve seat is limited through the base, the deformation of the sealing valve seat is relatively small, the acting force on the butterfly plate from the sealing valve seat is relatively small, and accordingly opening or closing operating torque of the butterfly plate is reduced. Meanwhile, the sealing valve seat is only made of nonmetal materials, the double eccentric butterfly valve is simple in structure, manufacturing is easy, and batch production is achieved.
Description
Technical field
The present invention relates to a kind of double eccentric butterfly valve, belong to fluid control technology field.
Background technique
Butterfly valve is the controlling component in fluid delivery system, has cut-off, adjustment, water conservancy diversion, prevents the functions such as adverse current, voltage stabilizing, shunting or overflow pressure relief, can be widely used in the feedway of compressible medium or incompressible medium.Wherein, the seal valve seat reason nonmetallic material of soft seal double eccentric butterfly valve are formed, there is between itself and the butterfly plate of metal material good sealability, obtain applying very widely in many fields such as oil, chemical industry, metallurgy, rock gas, shipbuilding, water power.
But, along with the development at home of LNG Liquefied natural gas (LNG) project and the determination of nationalization target, the performance of the soft seal double eccentric butterfly valve be applied under ultralow-temperature operation conditions is had higher requirement.Namely while ensureing double eccentric butterfly valve sealability, also require the operation torque minimization opened or close required for butterfly plate, guarantee the working life of double eccentric butterfly valve.In view of existing soft seal double eccentric butterfly valve use under ultralow-temperature operation conditions time, the valve seat of its nonmetallic material and the butterfly plate of metal material all shrink distortion, the two contraction deformation is under the same conditions inconsistent, the amount of deformation of the valve seat of usual nonmetallic material is greater than the amount of deformation of the butterfly plate of metal material, this is easy to cause valve seat contraction deformation seriously to hold butterfly plate tightly, increases the operation moment of torsion opened or close butterfly plate; The sealability between butterfly plate and valve seat also can be caused bad, there is leakage phenomenon in valve.
For solving the problems of the technologies described above, the sealing configuration of external soft seal double eccentric butterfly valve as shown in Figure 1, comprise the valve seat pressure ring 3 be fixedly connected on valve body 2, in the space formed between valve body 2 and valve seat pressure ring 3, valve seat is set, valve seat comprises the metal frame 4 be fixed on also in bending-like on valve body 2, and the soft seal circle 5 be fixedly connected with metal frame 4; One end of soft seal circle 5 is clamped on metal frame 4, and the other end is free sealed end, and the surface of free sealed end and the sealing surfaces of butterfly plate 1 form the sealing pair of double eccentric butterfly valve.The valve seat of this double eccentric butterfly valve is made up of metal frame 4 and soft seal circle 5, replace the valve seat be only made up of nonmetallic material in existing reality, under condition of ultralow temperature, the contraction deformation of valve seat entirety reduces, prevent soft seal circle gross distortion from holding butterfly plate tightly, reduce the active force to butterfly plate, thus reduce the operation moment of torsion opened or close butterfly plate; Meanwhile, the sealability between butterfly plate and valve seat is also guaranteed.
But, the metal frame design processing difficulties of valve seat in the double eccentric butterfly valve of said structure, the required precision of processing is high, is difficult to the batch production realizing double eccentric butterfly valve; Simultaneously, when double eccentric butterfly valve is closed, butterfly plate compresses soft seal circle, make the metal frame imposed deformation resilience of valve seat, when butterfly plate is opened, release resilience is applied active force to butterfly plate by the metal frame of valve seat, the long-time resilience of inevitable metal frame, easily cause metal frame to occur fatigue crack phenomenon, the scrappage of product is high, makes the whole service life of double eccentric butterfly valve low.
Summary of the invention
Therefore, technical problem to be solved by this invention is to overcome in prior art the double eccentric butterfly valve be applied under ultralow-temperature operation conditions cannot meet the less unlatching moment of torsion of butterfly plate and the overall lower difficulty of processing of double eccentric butterfly valve and the defect in higher working life simultaneously, thus provides the double eccentric butterfly valve that a kind of easy processing, long service life and butterfly plate open operation moment of torsion are little.
For this reason, the invention provides a kind of double eccentric butterfly valve, comprise
Valve body, has internal cavities;
Valve rod, sealing is inserted in the internal cavities of valve body;
Butterfly plate, is arranged on described valve rod;
Seal valve seat, between described butterfly plate and described valve body;
The axis in the horizontal direction of valve body described in described valve rod axis deviation in the horizontal direction and described butterfly plate axis in the horizontal direction; And rotate under the effect of external force and then drive described butterfly plate to rotate, butterfly plate is separated with seal valve seat or closes; Also comprise
Pedestal, is fixed on medium and flows on the valve body of side, and and medium flow into side valve body between form installing space; Described seal valve seat is positioned at described installing space, and is arranged on pedestal and is limited in the amount of deformation towards described butterfly plate direction under ultralow temperature by described pedestal;
Described seal valve seat is made up of nonmetallic material.
Above-mentioned double eccentric butterfly valve, described pedestal comprises the joint be fixedly connected with described valve body, and is arranged on the stop part on joint; Described seal valve seat comprises the auxiliary section be connected with the stop part of described pedestal, and the sealing labial lamina be connected with described auxiliary section, and described sealing labial lamina is positioned near described butterfly plate side.
Above-mentioned double eccentric butterfly valve, described pedestal has the horizontal part as joint be fixedly connected with valve body and the vertical protuberance as stop part be arranged on horizontal part; Described seal valve seat have as auxiliary section mounting groove and be positioned at sealing labial lamina and the confinement plate of described mounting groove both sides, described sealing labial lamina is positioned near described butterfly plate side, and described confinement plate is positioned near valve body side; Described seal valve seat is socketed on described vertical protuberance by described mounting groove.
Above-mentioned double eccentric butterfly valve, the top of described vertical protuberance is connected with the bottom transition of described mounting groove or interference fit is connected.
Above-mentioned double eccentric butterfly valve, has the first gap between the surface that the confinement plate of described seal valve seat and medium flow into side valve body; Between the inner side surface of described sealing labial lamina and the vertical protuberance of described pedestal, there is the second gap.
Above-mentioned double eccentric butterfly valve, has third space between the described bottom of sealing labial lamina and the top of the horizontal part of pedestal, and described third space is used for being connected with the medium of medium inflow direction.
Above-mentioned double eccentric butterfly valve, described confinement plate is L-type confinement plate; Described pedestal is T-shaped pedestal.
Above-mentioned double eccentric butterfly valve, the horizontal part of described pedestal and the surface of contact of described confinement plate also offer at least one groove.
Above-mentioned double eccentric butterfly valve, the valve body end face that medium flows into side is dual stage stepwise, and form described installing space between first step, second step and pedestal, described pedestal is arranged on first step, and described vertical protuberance is given prominence to towards second step.
Above-mentioned double eccentric butterfly valve, the crown center of described valve body offers long strip groove, and valve gap is arranged in described long strip groove, and by being sealedly connected and fixed between link and valve body.
Double eccentric butterfly valve provided by the invention, compared with double eccentric butterfly valve of the prior art, has the following advantages:
(1) double eccentric butterfly valve provided by the invention, the valve body flowing into side is fixed with pedestal, forms installing space between the valve body that pedestal and medium flow into side at medium; Seal valve seat is positioned at this installing space, and is arranged on pedestal and is limited in the amount of deformation towards butterfly plate direction under condition of ultralow temperature by pedestal.When using the double eccentric butterfly valve of this structure under condition of ultralow temperature, butterfly plate and seal valve seat all shrink distortion, in view of the amount of deformation of seal valve seat towards butterfly plate direction is limited by pedestal, make the amount of deformation of seal valve seat relatively little, and then seal valve seat is relatively little to the active force of butterfly plate, avoid the phenomenon occurring holding butterfly plate tightly because seal valve seat amount of deformation is excessive, thus the operation moment of torsion reducing butterfly plate unlatching or close; Simultaneously, seal valve seat only adopts nonmetallic material to make, replace the technological scheme that seal valve seat of the prior art is made up of soft seal circle and the metal frame of nonmetallic material, make the structure of seal valve seat simple, be easy to manufacturing, be convenient to the batch production of double eccentric butterfly valve, also improve the whole service life of double eccentric butterfly valve.
(2) double eccentric butterfly valve provided by the invention, pedestal has the horizontal part as joint be fixedly connected with valve body and the vertical protuberance as stop part be arranged on horizontal part; Seal valve seat have as auxiliary section mounting groove and be positioned at sealing labial lamina and the confinement plate of described mounting groove both sides, sealing labial lamina is positioned near described butterfly plate side, and confinement plate is positioned near valve body side; Seal valve seat is socketed on vertical protuberance by described mounting groove.Under condition of ultralow temperature, when seal valve seat and butterfly plate all shrink distortion, the confinement plate of baffle seal valve seat deforms by the vertical protuberance of pedestal, and then make seal valve seat overall relatively little towards the contraction deformation amount in butterfly plate direction, corresponding sealing labial lamina is also little towards the amount of deformation in butterfly plate direction, reduces the operation moment of torsion that butterfly plate is opened or closed; The structure of pedestal and valve seat is simple, and the cost of easy manufacturing, manufacture is also low.
(3) double eccentric butterfly valve provided by the invention, the top of vertical protuberance of pedestal is connected with the bottom transition of the mounting groove of seal valve seat or interference fit is connected, the amount of deformation of vertical protuberance to the bottom of seal valve seat mounting groove further by pedestal limits, make the amount of deformation of seal valve seat relatively less, the amount of deformation of its amount of deformation and butterfly plate closer to, namely butterfly plate is synchronous as far as possible with the amount of deformation of seal valve seat, guarantee that sealing labial lamina can not hold butterfly plate tightly, reduce the operation moment of torsion that butterfly plate is opened or closed; Meanwhile, the vertical protuberance of pedestal has certain pressure to seal valve seat, the seal valve seat after being out of shape under improving condition of ultralow temperature further and the sealability between butterfly plate.
(4) double eccentric butterfly valve provided by the invention, has the first gap between the surface that the confinement plate of seal valve seat and medium flow into side valve body; Between the inner side surface of sealing labial lamina and the vertical protuberance of pedestal, there is the second gap; The axis sealing the axis of labial lamina and butterfly plate sealing surface not on the same line time, the first gap arranged and the second gap, make sealing labial lamina in installing space, have certain activity space, be convenient to the mounting point adjusting seal valve seat, make the axis of the axis of sealing labial lamina and butterfly plate sealing surface on the same line, ensure the sealability between butterfly plate and seal valve seat.
(5) double eccentric butterfly valve provided by the invention, has third space between the sealing bottom of labial lamina and the top of the horizontal part of pedestal, and third space is used for being connected with the medium of medium inflow direction.When butterfly plate and seal valve seat are closed, medium will flow in third space, and in the second gap be communicated with third space, medium applies certain pressure, i.e. the pressure itself of medium to sealing labial lamina, makes the sealability between sealing labial lamina and butterfly plate higher.
(6) double eccentric butterfly valve provided by the invention, the horizontal part of described pedestal and the surface of contact of confinement plate also offer some grooves, when the horizontal part of pedestal forces the confinement plate of crush seal valve seat, some grooves on pedestal, be convenient to confinement plate to be squeezed on the horizontal part of pedestal, and force transition fit with the horizontal part of pedestal.
(7) double eccentric butterfly valve provided by the invention, the crown center of valve body offers long strip groove, and valve gap is arranged in described long strip groove, and by being sealedly connected and fixed between link and valve body.When valve rod rotarily drives butterfly plate rotation, the relative valve body of valve gap also can be driven to have rotary motion trend, but long strip groove is set on the top of valve body, valve gap is arranged in this long strip groove, relative for limiting valve cap valve body is rotated by the two side of groove, to guarantee the sealability between valve gap and valve body.
Accompanying drawing explanation
Fig. 1 is the structural representation of the seal valve seat of double eccentric butterfly valve of the prior art.
Fig. 2 is the structural representation of double eccentric butterfly valve provided by the invention.
Fig. 3 is the seal valve seat of double eccentric butterfly valve of the present invention and the mounting structure schematic diagram of valve body.
Fig. 4 is the structural representation of pedestal in double eccentric butterfly valve of the present invention.
Fig. 5 is the structural representation of the seal valve seat in double eccentric butterfly valve of the present invention.
Fig. 6 is the status architecture schematic diagram that the seal valve seat of double eccentric butterfly valve of the present invention and butterfly plate are closed.
Fig. 7 is the mounting structure schematic diagram of valve gap and valve body in double eccentric butterfly valve of the present invention.
In figure, mark is expressed as: 1-butterfly plate, 1a, 2a-axis, 2-valve body, 21-long strip groove, 22-first step, 23-second step, 3-valve seat pressure ring, 4-metal frame, 5-soft seal circle, 6-valve rod, 6a-axle center, 7-valve gap, 8-seal valve seat, 81-seals labial lamina, 82-confinement plate, 83-mounting groove, 9-pedestal, 91-horizontal part, 91a-groove, the vertical protuberance of 92-, 10-first gap, 11-second gap, 12-third space, 13-support, 14-pressing plate, 15-gland, 16-filler, 17-filler gasket ring, 18-manual actuator, 19-gasket seal.
Embodiment
embodiment 1
As shown in Figures 2 and 3, the present embodiment provides a kind of double eccentric butterfly valve, comprises
Valve body 2, has internal cavities;
Valve rod 6, sealing is inserted in the internal cavities of valve body 2;
Butterfly plate 1, is arranged on described valve rod 6;
Seal valve seat 8, between described butterfly plate 1 and described valve body 2;
Described valve rod 6 axle center 6a in the horizontal direction departs from described valve body 2 axis 2a in the horizontal direction, and departs from described butterfly plate 1 axis 1a in the horizontal direction; And rotate under the effect of external force and then drive described butterfly plate 1 to rotate, butterfly plate 1 is separated with seal valve seat 8 or closes; Also comprise
Pedestal 9, is fixed on medium and flows on the valve body 2 of side, and and medium flow into side valve body 2 between form installing space; Described seal valve seat 8 is positioned at described installing space, and is arranged on pedestal 9 and is limited in the amount of deformation towards described butterfly plate 1 direction under ultralow temperature by described pedestal 9; Described seal valve seat 8 is made up of nonmetallic material.
The double eccentric butterfly valve of said structure, in condition of ultralow temperature, when such as, using at-163 DEG C ~-196 DEG C, the butterfly plate 1 of metal material all shrinks distortion with the seal valve seat 8 of nonmetal softwood matter, and the amount of deformation of the two is inconsistent, the amount of deformation of seal valve seat 8 towards butterfly plate 1 direction is limited by the pedestal 9 arranged, make the amount of deformation of seal valve seat 8 relatively little, and then the active force of seal valve seat 8 pairs of butterfly plates 1 is relatively less, avoid the phenomenon occurring holding butterfly plate 1 tightly because seal valve seat 8 amount of deformation is excessive, thus the operation moment of torsion that minimizing butterfly plate 1 is opened or closed; Simultaneously, seal valve seat 8 only adopts nonmetallic material to make, seal valve seat 8 of the prior art is replaced to be made up of the soft seal circle of nonmetallic material and metal frame, make the structure of seal valve seat 8 simple, be easy to manufacturing, be convenient to the batch production of double eccentric butterfly valve, also improve the whole service life of double eccentric butterfly valve.
Specifically, as shown in Figure 4, pedestal 9 preferably has the horizontal part 91 be fixedly connected with valve body 2 and the vertical protuberance 92 be arranged on horizontal part 91, and meanwhile, horizontal part 91 and vertical protuberance 92 form the pedestal 9 of T-shaped jointly; As shown in Figure 5, seal valve seat 8 has mounting groove 83 and is positioned at sealing labial lamina 81 and the confinement plate 82 of mounting groove 83 both sides, and sealing labial lamina 81 is positioned near butterfly plate 1 side, for butterfly plate 1 fitted seal, confinement plate 82 is positioned near valve body 2 side; Seal valve seat 8 is socketed on vertical protuberance 92 by mounting groove 83.Under condition of ultralow temperature, when seal valve seat 8 and butterfly plate 1 all shrink distortion, the confinement plate 82 of baffle seal valve seat 8 deforms by the vertical protuberance 92 of pedestal 9, and then make seal valve seat 8 entirety relatively little towards the contraction deformation amount in butterfly plate 1 direction, corresponding sealing labial lamina 81 also diminishes accordingly towards the amount of deformation in butterfly plate 1 direction, thus reduces the operation moment of torsion that butterfly plate 1 opens or close, simultaneously the pedestal 9 of this structure and seal valve seat 8 structure simple, be easy to manufacturing, cost is also low.
Except the pedestal 9 of said structure and seal valve seat 8, as long as described pedestal 9 comprises the joint be fixedly connected with described valve body 2, and be arranged on joint for limiting seal valve seat 8 stop part towards described sealing labial lamina 81 amount of deforming under condition of ultralow temperature, its concrete profile is not further limited; As long as described seal valve seat 8 also comprises the auxiliary section be connected with the stop part of described pedestal 9, and the sealing labial lamina 81 be connected with described auxiliary section, and sealing labial lamina 81 is near butterfly plate 1 side.
For the seal valve seat 8 of above-mentioned nonmetallic material, preferred employing fluoroplastic are made, such as polychlorotrifluoroethylene (PCTFF), poly-perfluoro alkoxy (PFA) resin, polytetrafluoroethylene (PTFE), ethene one chlorotrifluoroethylene (ECTFE) etc. material, material more preferably polychlorotrifluoroethylene (PCTFF) material of seal valve seat 8, polychlorotrifluoroethylene (PCTFF) material has self-lubricating property, still good elasticity can be kept under condition of ultralow temperature, sealing labial lamina 81 is made to keep fitting with the sealing surface of butterfly plate 1, and when double eccentric butterfly valve is opened butterfly plate 1 and sealing labial lamina 81 between frictional force little, the working life of double eccentric butterfly valve can be improved, and reduce moment of torsion further.In addition, the material of seal valve seat 8 can also be made for other the nonmetallic material with some strength; For the butterfly plate 1 of metal material, preferably adopting stainless steel to make, can also be the materials such as iron, aluminium, copper, also can adopt daily in other metallic material of frequent use make.
Further, the top of the vertical protuberance 92 of pedestal 9 preferably adopts transition fit to be connected with the bottom of the mounting groove 83 of seal valve seat 8, amount of deformation bottom the mounting groove 83 of vertical protuberance 92 pairs of seal valve seats 8 of pedestal 9 limits further, make the bulk deformation amount of seal valve seat 8 relatively less, the amount of deformation of its amount of deformation and butterfly plate 1 closer to, namely butterfly plate 1 is synchronous as far as possible with the amount of deformation of seal valve seat 8, guarantee can not hold butterfly plate 1 tightly at ultralow temperature or lower pressure lower seal labial lamina 81, reduce the operation moment of torsion that butterfly plate 1 is opened or closed; Meanwhile, vertical protuberance 92 pairs of seal valve seats 8 of pedestal 9 have certain pressure, the seal valve seat 8 after being out of shape under improving condition of ultralow temperature further and the sealability between butterfly plate 1.
As distortion, the top of the vertical protuberance 92 of pedestal 9 can also adopt interference fit to be connected with the bottom of the mounting groove 83 of seal valve seat 8, or other conventional pressure fit systems connect.Further, a groove 91a can also be offered on the horizontal part 91 of pedestal 9 with the surface of contact of confinement plate 82, when pedestal 9 vertical protuberance 92 transition or be interference fitted in seal valve seat 8 mounting groove 83 in time, some groove 91a that the horizontal part 91 of pedestal 9 is offered, are convenient to the confinement plate 82 of seal valve seat 8 to force to be squeezed in the upper flat portion 91 of pedestal 9.In addition, the quantity of groove 91a can also be 2,3, more than 4 and 4 etc., and its quantity offered is determined according to actual service condition, usually arranges at least one.
As shown in Figure 6, in order to make the sealability between butterfly plate 1 and sealing labial lamina 81 higher, as preferably, between the surface flowing into side valve body 2 at the confinement plate 82 of seal valve seat 8 and medium, there is the first gap 10; There is between the inner side surface of described sealing labial lamina 81 and the vertical protuberance 92 of described pedestal 9 second gap 11.The axis sealing the axis of labial lamina 81 and butterfly plate 1 sealing surface not on the same line time, the first gap 10 and the second gap 11 arranged, make sealing labial lamina 81 in installing space, have certain activity space, be convenient to the mounting point adjusting seal valve seat 8, make the axis of the axis of sealing labial lamina 81 and butterfly plate 1 sealing surface on the same line, the sealability between butterfly plate 1 and seal valve seat 8 reaches best.
More preferably, between the sealing bottom of labial lamina 81 and the top of the horizontal part 91 of pedestal 9, also have third space 12, described third space 12 is for being connected with the medium of medium inflow direction.When butterfly plate 1 is closed with seal valve seat 8, medium will flow in third space 12, and in the second gap 11 to be communicated with third space 12, medium applies certain pressure to sealing labial lamina 81, the i.e. pressure itself of medium, sealing labial lamina 81 is pressed on closely on butterfly plate 1, improves the sealability between sealing labial lamina 81 and butterfly plate 1 further.Can also according to the actual service condition of double eccentric butterfly valve, if desired the pressure of medium to sealing labial lamina 81 is larger, can by the space of third space 12, and the spatial design in the second gap 11 to be communicated with third space 12 is larger, make more medium flow in third space 12, second gap 11, increase the pressure of medium to sealing labial lamina 81; On the contrary, when if desired the pressure of medium to sealing labial lamina 81 is less, relatively little by the spatial design in third space 12, second gap 11.
For above-mentioned double eccentric butterfly valve 2 specifically, preferably medium flows into the valve body end face of side is dual stage stepwise, described installing space is formed between first step 22, second step 23 and pedestal 9, described pedestal 9 is arranged on first step 22, and described vertical protuberance 92 is given prominence to towards second step 23.More specifically, the profile decision design l-shaped of wherein said confinement plate 82, corresponding pedestal 9 is designed to T-shaped, horizontal part 91 one end of pedestal 9 is fixedly connected on first step 22, the means of fixation of bolt, screw etc. is such as adopted to connect, also can by one-body molded for pedestal 9 on first step 22, the other end of the horizontal part 91 of pedestal 9 is free end.
One as valve body end face is out of shape, the valve body end face that medium flows into side is separate unit stepwise, described pedestal 9 is in L-type, its horizontal part 91 is fixedly connected on valve body end face step, and preset clearance between the horizontal part 91 of valve body end face step and pedestal 9, the horizontal part of the confinement plate 82 of seal valve seat 8 is arranged in this preset clearance.
In addition, valve gap 7 is connected with at the sealed on top of described valve body 2, be provided with filler gasket ring 17, filler 16, gland 15 and the pressing plate 14 for compressing filler 16 in gap between described valve gap 7 and valve rod 6 from bottom to up successively, described pressing plate 14 is fixedly connected on valve gap 7; Valve gap 7 is also provided with support 13, and the bottom of support 13 is connected on valve gap 7, and its top is fixedly connected on the driving mechanism of valve rod 6, and such as usually adopt manual actuator 18, the top of described valve rod 6 is fixedly connected with manual actuator 18.
embodiment 2
A kind of double eccentric butterfly valve that the present embodiment provides, as shown in Figure 7, the difference of the double eccentric butterfly valve that itself and embodiment 1 provide only is: the crown center of described valve body 2 offers long strip groove 21, valve gap 7 is arranged in described long strip groove 21, and by being sealedly connected and fixed between link and valve body 2.On the normally direct top being fixed on valve body 2 by bolt or screw of valve gap 7 of the prior art, and be provided with gasket seal 19 at valve gap 7 and the surface of contact of valve body 2, but when valve rod 6 drives butterfly plate 1 to rotate, the rotation of valve rod 6 can drive valve gap 7 to have rotary motion trend relative to valve body 2, thus affect the sealability of gasket seal 19, cause the leakage phenomenon of double eccentric butterfly valve, and the double eccentric butterfly valve of the present embodiment, in the long strip groove 21 that the crown center that valve gap 7 is fixedly mounted on valve body 2 is offered, when valve rod 6 rotates, relative for limiting valve cap 7 valve body 2 is rotated by the two side of long strip groove 21, namely between valve gap 7 and valve body 2 without relative rotary motion, thus the gasket seal 19 arranged between valve body 2 and valve gap 7 can not be affected, avoid double eccentric butterfly valve generation leakage phenomenon.
The bottom of above-mentioned valve gap 7 is preferably designed to long strip, long strip groove 21 on its size and described valve body 2 top matches, be convenient to more closely valve gap 7 is arranged in the long strip groove 21 on valve body 2, improve the sealability of surface of contact between valve gap 7 and valve body 2.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to mode of execution.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all mode of executions.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (10)
1. a double eccentric butterfly valve, comprises
Valve body (2), has internal cavities;
Valve rod (6), sealing is inserted in the internal cavities of valve body (2);
Butterfly plate (1), is arranged on described valve rod (6);
Seal valve seat (8), is positioned between described butterfly plate (1) and described valve body (2);
Described valve body (2) axis in the horizontal direction (2a) and described butterfly plate (1) axis in the horizontal direction (1a) are departed from described valve rod (6) axle center in the horizontal direction (6a), and rotate under the effect of external force and then drive described butterfly plate (1) to rotate, butterfly plate (1) is separated with seal valve seat (8) or closes;
It is characterized in that: also comprise
Pedestal (9), is fixed on medium and flows on the valve body (2) of side, and and medium flow into side valve body (2) between form installing space; Described seal valve seat (8) is positioned at described installing space, and it is upper and be limited in the amount of deformation towards described butterfly plate (1) direction under ultralow temperature by described pedestal (9) to be arranged on pedestal (9);
Described seal valve seat (8) is made up of nonmetallic material.
2. double eccentric butterfly valve according to claim 1, is characterized in that: described pedestal (9) comprises the joint be fixedly connected with described valve body (2), and is arranged on the stop part on joint; Described seal valve seat (8) comprises the auxiliary section be connected with the stop part of described pedestal (9), and the sealing labial lamina (81) be connected with described auxiliary section, and described sealing labial lamina (81) is positioned near described butterfly plate (1) side.
3. according to the double eccentric butterfly valve that claim 2 is stated, it is characterized in that: described pedestal (9) has the horizontal part as joint (91) be fixedly connected with valve body (2) and the vertical protuberance (92) as stop part be arranged on horizontal part (91); Described seal valve seat (8) have as auxiliary section mounting groove (83) and be positioned at sealing labial lamina (81) and the confinement plate (82) of described mounting groove (83) both sides, described sealing labial lamina (81) is positioned near described butterfly plate (1) side, and described confinement plate (82) is positioned near valve body (2) side; Described seal valve seat (8) is socketed on described vertical protuberance (92) by described mounting groove (83).
4. double eccentric butterfly valve according to claim 3, is characterized in that: the top of described vertical protuberance (92) is connected with the bottom transition of described mounting groove (83) or interference fit is connected.
5. the double eccentric butterfly valve according to claim 3 or 4, is characterized in that: have the first gap (10) between the surface that the confinement plate (82) of described seal valve seat (8) and medium flow into side valve body (2); Between the inner side surface of described sealing labial lamina (81) and the vertical protuberance (92) of described pedestal (9), there is the second gap (11).
6. the double eccentric butterfly valve according to any one of claim 3-5, it is characterized in that: have third space (12) between the top of the bottom of described sealing labial lamina (81) and the horizontal part (91) of pedestal (9), described third space (12) is for being connected with the medium of medium inflow direction.
7. the double eccentric butterfly valve according to any one of claim 3-6, is characterized in that: described confinement plate (82) is L-type confinement plate; Described pedestal (9) is T-shaped pedestal.
8. the double eccentric butterfly valve according to any one of claim 4-7, is characterized in that: the horizontal part (91) of described pedestal (9) and the surface of contact of described confinement plate (82) also offer at least one groove (91a).
9. according to the arbitrary described double eccentric butterfly valve of claim 3-8, it is characterized in that: valve body (2) end face that medium flows into side is dual stage stepwise, described installing space is formed between first step (22), second step (23) and pedestal (9), described pedestal (9) is arranged on first step (22), and described vertical protuberance (92) is given prominence to towards second step (23).
10. according to the arbitrary described double eccentric butterfly valve of claim 1-9, it is characterized in that: the crown center of described valve body (2) offers long strip groove (21), valve gap (7) is arranged in described long strip groove (21), and by being sealedly connected and fixed between link and valve body (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510369441.3A CN104964044A (en) | 2015-06-30 | 2015-06-30 | Double eccentric butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510369441.3A CN104964044A (en) | 2015-06-30 | 2015-06-30 | Double eccentric butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104964044A true CN104964044A (en) | 2015-10-07 |
Family
ID=54218095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510369441.3A Pending CN104964044A (en) | 2015-06-30 | 2015-06-30 | Double eccentric butterfly valve |
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| Country | Link |
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| CN (1) | CN104964044A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485355A (en) * | 2016-01-21 | 2016-04-13 | 江南阀门有限公司 | Hard-sealing and low-temperature butterfly valve and sealing method thereof |
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| EP0774090A2 (en) * | 1994-06-03 | 1997-05-21 | Keystone International Holdings Corp. | Valve assembly having improved valve seat |
| WO2008149429A1 (en) * | 2007-06-05 | 2008-12-11 | Nbs Co., Ltd. | Butterfly valve for extreme cold |
| CN201326751Y (en) * | 2008-12-26 | 2009-10-14 | 大众阀门集团有限公司 | Double-eccentric soft-hard double-passage seal butterfly valve |
| CN201661695U (en) * | 2010-03-16 | 2010-12-01 | 苏州纽威阀门股份有限公司 | Double-eccentric soft sealing butterfly valve |
| CN202381713U (en) * | 2011-12-27 | 2012-08-15 | 大连船用阀门有限公司 | Dual-eccentric thin butterfly valve |
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| EP0774090A2 (en) * | 1994-06-03 | 1997-05-21 | Keystone International Holdings Corp. | Valve assembly having improved valve seat |
| EP0774090A4 (en) * | 1994-06-03 | 1999-06-23 | Keystone Int | Valve assembly having improved valve seat |
| WO2008149429A1 (en) * | 2007-06-05 | 2008-12-11 | Nbs Co., Ltd. | Butterfly valve for extreme cold |
| CN201326751Y (en) * | 2008-12-26 | 2009-10-14 | 大众阀门集团有限公司 | Double-eccentric soft-hard double-passage seal butterfly valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485355A (en) * | 2016-01-21 | 2016-04-13 | 江南阀门有限公司 | Hard-sealing and low-temperature butterfly valve and sealing method thereof |
| CN105485355B (en) * | 2016-01-21 | 2018-06-08 | 江南阀门有限公司 | A kind of hard sealing low temperature butterfly valve and its encapsulating method |
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Inventor after: Zhang Haibo Inventor after: Guo Jianlin Inventor before: Song Shijun |
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Application publication date: 20151007 |