CN108980377B - Double shaft bidirectional hard seal welded butterfly valve - Google Patents

Abstract

The invention discloses a biaxial bidirectional hard-sealed welded butterfly valve, comprising a turbine driving device, a transmission device, a supporting device, an operating device and a fixed casing device. The turbine driving device includes a hand wheel and a turbine head, and the hand wheel is arranged on the turbine head. On the upper side, the handwheel is drivingly connected with the turbine head, the turbine head is arranged on the transmission device, and the transmission device is drivingly connected with the turbine head. The transmission works in the casing device. Through the double shaft connection in the transmission device and the symmetrical design of the bearing, it is avoided that when the fluid medium generates excessive pressure on the valve plate surface, the transmission device connected to it will be bent due to excessive torque. The structure of the valve seat and the valve seat pressure block enables the movable valve seat to be displaced to the fixed valve seat by the force of the fluid medium, so as to achieve the effect of two-way sealing, the sealing effect is the best, and the goal of zero leakage on both sides is achieved.

Description

Double shaft bidirectional hard seal welded butterfly valve

technical field

The invention relates to the field of welding butterfly valves, in particular to a biaxial bidirectional hard sealing welded butterfly valve.

Background technique

With the rapid development of the world economy, today, oil and gas resources are tight and energy is in short supply, while the demand for oil and gas is increasing, and it has to turn to harsh climates, extremely poor topography, inaccessible harsh winters, deserts, swamps and New energy production areas such as ocean continental shelves have caused great difficulties in transporting oil and natural gas. Pipeline transportation is the main mode of natural gas transportation. According to statistics, more than 95% of natural gas transportation in the world adopts pipeline mode, and a single large-diameter, high-pressure transportation mode is adopted to reduce investment and maintenance costs.

In the rapid development of the national economy, pipeline transportation has become an important transportation way for oil, gas and heating, and the valve as a pipeline control function plays an important role. In the pipeline system of energy, metallurgy, petrochemical and other industries, various It can be used to control various types of fluids such as air, water, various corrosive media, mud, oil, liquid metal and radioactive media. It can also be used for pipeline transportation of solid substances.

Among various valves with different uses, the butterfly valve has the advantages of good cut-off performance, very little leakage, good adjustment performance, high-speed flux, good corrosion resistance, small size, low weight, easy configuration, etc., and its application range has been continuously expanded. Expansion, in addition to the original normal temperature, low pressure and general medium applicable environment, in the chemical industry with severe corrosion, the butterfly valve can almost replace the commonly used globe valve, plug valve and ball valve in terms of application effect. In fact, in modern urban construction projects, due to the increasing requirements for environmental protection, the low-pressure iron gate valves commonly used in the past have gradually turned to environmentally friendly metal-sealed butterfly valves.

When the one-way pressure-sealed butterfly valve on the market is in use, its disc must face the flow direction of the fluid medium. In the pipeline of the one-way pressure-sealed butterfly valve, the fluid medium can only flow in one direction, so the valve body will There is an arrow with the direction of the medium flow. When installing the one-way pressure sealing butterfly valve, pay special attention to the installation according to the direction of the arrow. In order to broaden the scope of application of the butterfly valve, the two-way pressure-sealed butterfly valve is better than the one-way pressure-sealed butterfly valve, which can be applied to the situation where there is medium flow at both ends of the pipeline.

The two-way pressure-sealed butterfly valve does not need to consider the flow direction of the fluid medium of the butterfly valve when in use, but when in use, because the valve stem is subjected to the pressure of the medium in two directions, therefore, in design, the two-way pressure-sealed butterfly valve stem is in the The diameter is often larger than that of the one-way pressure sealing butterfly valve, but increasing the diameter of the valve stem and the pressure pressure will cause wear between the valve stem and the bottom cover connected to it due to sliding friction during use. , There will be a gap between the valve stem and the bottom cover. When the fluid medium generates too much pressure on the butterfly plate, the valve stem will lift up or fall down in the valve stem shaft, which is easy to cause the valve shaft shaft to be too large due to torsion force. The phenomenon of shaft bending will also lead to poor sealing performance of the two-way pressure-sealed butterfly valve.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a biaxial bidirectional hard sealing welded butterfly valve to solve the problems in the prior art.

To achieve the above object, the present invention provides the following technical solutions:

The double-axis bidirectional hard-sealed welded butterfly valve includes a turbine drive device, a transmission device, a support device, an operating device and a fixed casing device. The turbine drive device includes a hand wheel and a turbine head, the hand wheel is arranged on the turbine head, and the The handwheel is connected with the turbine head in a transmission, the turbine head is arranged on the transmission device, the transmission device is in transmission connection with the turbine head, the operation device is arranged on the transmission device, and the transmission device and the operation device are fixedly connected by bolts, The supporting device is arranged between the transmission device and the fixed casing device, the supporting device is arranged outside the transmission device, the supporting device and the transmission device are fixedly connected by bolts, and the supporting device and the turbine head are fixedly connected by bolts, so the The supporting device is fixedly connected with the fixed casing device by electric welding, the operating device is arranged in the fixed casing device, the transmission device extends into the fixed casing device, and the fixed casing device is fixedly connected with the transmission device.

As an optimization, the support device includes a support shell, an upper support platform, a lower support platform, an upper support platform region and a lower support platform region, the support shell is arranged between the turbine head and the fixed shell device, the support shell is connected to the turbine The head is fixedly connected by bolts, the support shell and the fixed shell device are fixedly connected by electric welding, the upper support table and the lower support table are arranged inside the support shell, the upper support table and the lower support table are fixedly connected by bolts, the The support shell is in the shape of a hollow tube, the space formed by the support shell and the upper support platform is the upper support platform area, and the space formed by the support shell and the lower support platform is the lower support platform area.

As an optimization, the transmission device includes a valve stem, an upper connecting half shaft, an upper double shaft fixing sleeve, an upper bearing, an upper nut, a lower nut, a lower bearing, a lower connecting half shaft, a lower double shaft fixing sleeve, a first sealing packing and The valve stem sleeve, the valve stem extends into the turbine head and is fixedly connected with the turbine head, the valve stem passes through the support device and the fixed casing device, the valve stem is fixedly connected with the operating device, and the outer side of the valve stem is provided with an upper A connecting half shaft and a lower connecting half shaft, the upper connecting half shaft and the lower connecting half shaft are arranged in the upper support platform area, the outer sides of the upper connecting half shaft and the lower connecting half shaft are provided with threads, and the upper connecting half shaft It is fixedly connected with the upper nut through threads, the lower connecting half shaft and the lower nut are fixedly connected by threads, and an upper bearing is arranged on the upper nut, and the upper bearing is arranged on the outer side of the upper connecting half shaft. The outer side is provided with an upper double shaft fixing sleeve, the upper double shaft fixing sleeve is nested and connected with the upper bearing, the upper double shaft fixing sleeve is arranged on the upper nut, and the upper double shaft fixing sleeve is fixedly connected with the upper nut, so A lower bearing is arranged under the lower nut, the lower bearing is arranged on the outer side of the lower connecting half shaft, the outer side of the lower bearing is arranged with a lower double-shaft fixing sleeve, and the lower double-shaft fixing sleeve is nested and connected with the lower bearing, so The lower biaxial fixing sleeve is arranged under the lower nut, the lower biaxial fixing sleeve is fixedly connected with the lower nut, the lower biaxial fixing sleeve passes through the upper support table and the lower support table, and the lower biaxial fixing sleeve is arranged below There is a valve stem sleeve, the lower biaxial fixing sleeve extends into the lower support platform area, the valve stem sleeve is arranged inside the lower support platform area, the valve stem sleeve is arranged outside the valve stem, the valve stem and the valve stem sleeve A gap is arranged therebetween, and a first sealing filler is arranged in the gap, and the first sealing filler is made of graphite.

As an optimization, the operating device includes a valve seat pressing block and a valve plate, the valve seat pressing block is arranged on the valve plate, the valve seat pressing block is fixedly connected to the valve plate, and the valve seat pressing block is connected to the fixed casing device. conflict, the valve plate includes a bottom plate, a sealing ring and a sealing plate, the valve rod is bolted to the bottom plate through the bottom plate, the sealing ring is arranged between the bottom plate and the sealing plate, the bottom plate, the sealing ring and the sealing plate The valve plate is a circular valve plate, and the valve stem passes through the center of the valve plate.

As an optimization, the fixed shell device includes a valve seat, a valve body, a second sealing packing, a third bearing, a valve stem fixing sleeve and a bottom cover, the valve seat is arranged in the valve body, and the valve seat and the valve seat pressing block In conflict, the valve seat is fixedly connected to the inner side of the valve body, the valve body is hollow tubular, the outer side of the valve body is fixedly connected to the support shell by electric welding, and the outer side of the bottom end of the valve stem is provided with a valve stem fixing sleeve, so A gap is set between the valve stem fixing sleeve and the valve stem, a second sealing packing is arranged in the gap, and the second sealing packing is made of graphite, the valve stem fixing sleeve is fixedly connected with the valve body by electric welding, and the valve A bottom cover is arranged under the rod, and the bottom cover is fixedly connected with the valve rod fixing sleeve with bolts.

As an optimization, the valve seat includes a spring groove, a spring, a sliding rod, a blocking plate and a push rod, the spring groove is a hollow groove, and a groove in the center of the spring groove is provided with a spring, and the spring is fixed to the spring groove connection, the spring groove is provided with a sliding rod, the sliding rod is slidably connected with the spring groove, the spring groove is fixedly connected with the valve body, the sliding rod is provided with a blocking piece, and the blocking piece is fixedly connected to the sliding rod , a push rod is arranged between the blocking piece and the spring, the push rod is L-shaped, the vertical end of the push rod is fixedly connected with the sliding rod, and the horizontal end of the push rod is in conflict with the valve seat pressure block, so The vertical side of the push rod is fixedly connected with the spring.

As an optimization, a gear set is set in the turbine head, a transmission rod is set on the hand wheel, the transmission rod is fixedly connected with the hand wheel, and a precision spiral groove is set on the transmission rod, and the gear set is connected with the hand wheel. The precise spiral groove is engaged in meshing connection, and the valve stem extends into the turbine head and is fixedly connected with the gear set.

Compared with the prior art, the beneficial effects of the present invention are: the present invention drives the transmission device through the turbine drive device to drive the operating device in the support device to drive the work in the fixed housing device, and the dual shaft connection in the transmission device and the symmetry of the bearing are used. The design avoids that when the fluid medium generates excessive pressure on the valve plate surface, the transmission device connected to it will bend the shaft due to excessive torque. The force generated by the valve is displaced to the fixed valve seat to achieve the effect of two-way sealing, the sealing effect is the best, and the purpose of zero leakage on both sides is achieved.

Description of drawings

1 is a side cross-sectional view of a biaxial bidirectional hard-sealed welded butterfly valve of the present invention;

Fig. 2 is the front sectional view of the biaxial bidirectional hard sealing welded butterfly valve of the present invention;

3 is a sectional view of the transmission device and the support device of the biaxial bidirectional hard-sealed welded butterfly valve of the present invention;

4 is a schematic structural diagram of the valve seat and the valve seat pressing block of the biaxial bidirectional hard sealing welded butterfly valve of the present invention;

FIG. 5 is a schematic structural diagram of the turbine driving device of the biaxial bidirectional hard-sealed welded butterfly valve of the present invention.

In the figure: 1-bottom cover, 2-third bearing, 3-second packing, 4-valve body, 5-valve stem, 6-valve seat, 62-spring, 63-slide rod, 64-block, 65-push rod, 66-spring groove, 7-valve plate, 71-base plate, 72-sealing ring, 73-sealing plate, 8-valve seat pressure block, 9-first sealing packing, 10-lower double shaft fixing sleeve , 11-upper bearing, 12-upper connecting half shaft, 13-turbine head, 131-gear set, 14-handwheel, 15-support shell, 16-upper support table, 161-upper support table area, 17-lower support Table, 171-lower support table area, 18-lower bearing, 19-valve stem sleeve, 20-upper double shaft fixing sleeve, 21-upper nut, 22-lower nut, 23-lower connecting half shaft, 24-valve stem fixing Sleeve, 25-transmission rod, 251-precision helical groove, 26-turbine drive device, 27-transmission device, 28-support device, 29-operating device, 30-fixed housing device.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the embodiment of the present invention, as shown in FIG. 1 , the biaxial bidirectional hard sealing welded butterfly valve includes a turbine drive device 26, a transmission device 27, a support device 28, an operation device 29 and a fixed casing device 30. The turbine drive device 26 includes a handwheel. 14 and the turbine head 13, the hand wheel 14 is arranged on the turbine head 13, the hand wheel 14 is connected with the turbine head 13 in a driving manner, the turbine head 13 is arranged on the transmission device 27, the transmission device 27 is in a transmission connection with the turbine head 13, and the operating device 29 is arranged On the transmission device 27, the transmission device 27 and the operating device 29 are fixedly connected by bolts, the support device 28 is arranged between the transmission device 27 and the fixed casing device 30, the support device 28 is arranged outside the transmission device 27, and the support device 28 is connected to the transmission device. 27 is fixedly connected by bolts, the support device 28 and the turbine head 13 are fixedly connected by bolts, the support device 28 and the fixed casing device 30 are fixedly connected by electric welding, the operating device 29 is arranged in the fixed casing device 30, and the transmission device 27 extends into the fixed casing device 30 , the fixed housing device 30 is fixedly connected with the transmission device 27 .

As shown in FIGS. 2 and 3 , the support device 28 includes a support shell 15 , an upper support platform 16 , a lower support platform 17 , an upper support platform region 161 and a lower support platform region 171 , and the support shell 15 is arranged on the turbine head 13 and the fixed shell device. Between 30, the support shell 15 and the turbine head 13 are fixedly connected by bolts, the support shell 15 and the fixed shell device 30 are fixedly connected by electric welding, the upper support table 16 and the lower support table 17 are arranged inside the support shell 15, and the upper support table 16 and the The lower support table 17 is fixedly connected by bolts, the support shell 15 is hollow tubular, the space formed by the support shell 15 and the upper support table 16 is the upper support table area 161, and the space formed by the support shell 15 and the lower support table 17 is the lower support table area 171.

As shown in FIG. 2 , the transmission device 27 includes the valve stem 5 , the upper connecting half shaft 12 , the upper biaxial fixing sleeve 20 , the upper bearing 11 , the upper nut 21 , the lower nut 22 , the lower bearing 18 , the lower connecting half shaft 23 , the lower bearing The double shaft fixing sleeve 10, the first sealing packing 9 and the valve stem sleeve 19, the valve stem 5 extends into the turbine head 13 and is fixedly connected with the turbine head 13, the valve stem 5 passes through the support device 28 and the fixed casing device 30, the valve stem 5 It is fixedly connected with the operating device 29, the valve stem 5 is provided with an upper connecting half shaft 12 and a lower connecting half shaft 23, the upper connecting half shaft 12 and the lower connecting half shaft 23 are arranged in the upper support table area 161, and the upper connecting half shaft 12 The outer side of the lower connecting half shaft 23 is provided with threads, the upper connecting half shaft 12 and the upper nut 21 are fixedly connected by threads, the lower connecting half shaft 23 and the lower nut 22 are fixedly connected by threads, the upper nut 21 is provided with the upper bearing 11, the upper The bearing 11 is arranged on the outer side of the upper connecting half shaft 12, the outer side of the upper bearing 11 is provided with an upper biaxial fixing sleeve 20, the upper biaxial fixing sleeve 20 is nested and connected with the upper bearing 11, and the upper biaxial fixing sleeve 20 is arranged on the upper nut. 21, the upper biaxial fixing sleeve 20 is fixedly connected with the upper nut 21, the lower nut 22 is provided with a lower bearing 18, the lower bearing 18 is arranged on the outer side of the lower connecting half shaft 23, and the outer side of the lower bearing 18 is provided with a lower biaxial fixing sleeve 10. The lower biaxial fixing sleeve 10 is nested and connected with the lower bearing 18, the lower biaxial fixing sleeve 10 is arranged under the lower nut 22, the lower biaxial fixing sleeve 10 is fixedly connected with the lower nut 22, and the lower biaxial fixing sleeve 10 passes through the upper The support table 16 and the lower support table 17, a valve stem cover 19 is arranged under the lower biaxial fixing sleeve 10, the lower biaxial fixing sleeve 10 extends into the lower supporting table area 171, and the valve stem sleeve 19 is arranged inside the lower supporting table area 171. The rod sleeve 19 is arranged on the outside of the valve rod 5, a gap is set between the valve rod 5 and the valve rod sleeve 19, and a first sealing packing 9 is arranged in the gap, and the first sealing packing 9 is made of graphite.

As shown in FIG. 2 , the operating device 29 includes a valve seat pressing block 8 and a valve plate 7 , the valve seat pressing block 8 is arranged on the valve plate 7 , the valve seat pressing block 8 is fixedly connected to the valve plate 7 , and the valve seat pressing block 8 is fixed to the valve plate 7 . The housing device 30 is in conflict, the valve plate 7 includes a bottom plate 71, a sealing ring 72 and a sealing plate 73, the valve rod 5 is bolted through the bottom plate 71 and connected to the bottom plate 71, and the sealing ring 72 is arranged between the bottom plate 71 and the sealing plate 73. 71. The sealing ring 72 and the sealing plate 73 are fixedly connected by bolts, the valve plate 7 is a circular valve plate, and the valve stem 5 passes through the center of the valve plate 7 .

As shown in FIG. 2 , the fixed shell device 30 includes a valve seat 6 , a valve body 4 , a second sealing packing 3 , a third bearing 2 , a valve stem fixing sleeve 24 and a bottom cover 1 , the valve seat 6 is arranged in the valve body 4 , The valve seat 6 is in contact with the valve seat pressing block 8, the valve seat 6 is fixedly connected with the inner side of the valve body 4, the valve body 4 is hollow tubular, the outer side of the valve body 4 is fixedly connected with the support shell 15 by electric welding, and the outer side of the bottom end of the valve stem 5 is arranged There is a valve stem fixing sleeve 24, a gap is set between the valve stem fixing sleeve 24 and the valve stem 5, a second sealing packing 3 is arranged in the gap, the second sealing packing 3 is made of graphite, and the valve stem fixing sleeve 24 and the valve body 4 are welded by electric welding For fixed connection, a bottom cover 1 is provided under the valve stem 5, and the bottom cover 1 is fixedly connected with the valve stem fixing sleeve 24 by bolts.

As shown in FIG. 4 , the valve seat 6 includes a spring groove 66 , a spring 62 , a sliding rod 63 , a blocking plate 64 and a push rod 65 , the spring groove 66 is a hollow groove, and the groove in the center of the spring groove 66 is provided with a spring 62 . 62 is fixedly connected with the spring groove 66, the spring groove 66 is provided with a sliding rod 63, the sliding rod 63 is slidably connected with the spring groove 66, the spring groove 66 is fixedly connected with the valve body 4, the sliding rod 63 is provided with a blocking piece 64, the blocking piece 64 is fixedly connected to the sliding rod 63, a push rod 65 is arranged between the blocking piece 64 and the spring 62, the push rod 65 is L-shaped, the vertical end of the push rod 65 is fixedly connected to the sliding rod 63, and the horizontal end of the push rod 65 is pressed against the valve seat. The blocks 8 collide, and the vertical edge of the push rod 65 is fixedly connected with the spring 62 .

As shown in FIG. 5 , the turbine head 13 is provided with a gear set 131, the hand wheel 14 is provided with a transmission rod 25, the transmission rod 25 is fixedly connected with the hand wheel 14, and the transmission rod 25 is provided with a precision spiral groove 251, the gear set 131 is engaged with the precision helical groove 251, and the valve rod 5 extends into the turbine head 13 and is fixedly connected with the gear set 131.

The invention drives the transmission device through the turbine drive device to drive the operation device in the support device to drive the work in the fixed casing device, and the double shaft connection in the transmission device and the symmetrical design of the bearing prevent the fluid medium from generating excessive pressure on the valve plate surface. The transmission device connected to it is in the condition that the shaft is bent due to excessive torque. In addition, through the structure of the valve seat and the valve seat pressure block, the movable valve seat is displaced to the fixed valve seat by the force of the fluid medium, so as to realize the two-way sealing. The sealing effect is the best, and the purpose of zero leakage on both sides is achieved.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and range of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (5)

1. the hard sealing welding butterfly valve of double-shaft two-way, it is characterised in that: including turbine-driven set (26), transmission device (27), branch Support arrangement (28), operating device (29) and fixing shell device (30), the turbine-driven set (26) include handwheel (14) and Turbine head (13), the handwheel (14) are arranged on turbine head (13), and the handwheel (14) and turbine head (13) are sequentially connected, institute It states turbine head (13) to be arranged on transmission device (27), the transmission device (27) and turbine head (13) are sequentially connected, the behaviour Make device (29) to be arranged on transmission device (27), the transmission device (27) and operating device (29) company of being bolted It connects, the support device (28) is arranged between transmission device (27) and fixing shell device (30), the support device (28) Setting is on the outside of transmission device (27), and the support device (28) is bolted to connection with transmission device (27), the branch Support arrangement (28) is bolted to connection with turbine head (13), and the support device (28) passes through with fixing shell device (30) Electric welding is fixedly connected, and in fixing shell device (30), the transmission device (27) is protruded into solid for operating device (29) setting Determine canning (30), the fixing shell device (30) is fixedly connected with transmission device (27)；

The support device (28) includes support housing (15), upper supporting table (16), lower supporting table (17), upper supporting table area (161) and lower supporting table area (171), support housing (15) setting turbine head (13) and fixing shell device (30) it Between, the support housing (15) is bolted to connection with turbine head (13), and the support housing (15) and fixing shell fill (30) to be set to be fixedly connected by electric welding, the upper supporting table (16) and lower supporting table (17) are arranged in support housing (15) inside, The upper supporting table (16) is bolted to connection with lower supporting table (17), and the support housing (15) is hollow tubular, institute Stating the space that support housing (15) and upper supporting table (16) are formed is upper supporting table area (161), and the support housing (15) is under The space that supporting table (17) is formed is lower supporting table area (171)；

The transmission device (27) include valve rod (5), upper connection semiaxis (12), upper twin shaft fixing sleeve (20), upper bearing (metal) (11), on Nut (21), lower nut (22), lower bearing (18), lower connection semiaxis (23), lower twin shaft fixing sleeve (10), the first airtight and watertight padding (9) it protrudes into turbine head (13) with valve stem sleeve (19), the valve rod (5) and is fixedly connected with turbine head (13), the valve rod (5) is worn Support device (28) and fixing shell device (30) are crossed, the valve rod (5) is fixedly connected with operating device (29), the valve rod (5) outside is provided with connection semiaxis (12) and lower connection semiaxis (23), the upper connection semiaxis (12) and lower connection semiaxis (23) setting is provided with screw thread on the outside of the upper connection semiaxis (12) and lower connection semiaxis (23) in upper supporting table area (161), The upper connection semiaxis (12) is threadably secured with top nut (21) to be connect, the lower connection semiaxis (23) and lower nut (22) It is threadably secured connection, is provided with upper bearing (metal) (11) on the top nut (21), the upper bearing (metal) (11) is arranged in upper connection The outside of semiaxis (12) is provided with twin shaft fixing sleeve (20) on the outside of the upper bearing (metal) (11), the upper twin shaft fixing sleeve (20) with upper bearing (metal) (11) nested encryptions, on top nut (21), the upper twin shaft is solid for upper twin shaft fixing sleeve (20) setting Fixed set (20) is fixedly connected with top nut (21), and the lower nut (22) is arranged with lower bearing (18), the lower bearing (18) It is arranged and is provided with lower twin shaft fixing sleeve (10) on the outside of the outside of lower connection semiaxis (23), the lower bearing (18), under described Twin shaft fixing sleeve (10) and lower bearing (18) nested encryptions, the lower twin shaft fixing sleeve (10) are arranged under lower nut (22), institute Lower twin shaft fixing sleeve (10) is stated to be fixedly connected with lower nut (22), the lower twin shaft fixing sleeve (10) pass through upper supporting table (16) and Lower supporting table (17), the lower twin shaft fixing sleeve (10) are arranged with valve stem sleeve (19), and the lower twin shaft fixing sleeve (10) is protruded into Lower supporting table area (171), valve stem sleeve (19) setting is internal in lower supporting table area (171), and valve stem sleeve (19) setting exists On the outside of valve rod (5), it is provided with gap between the valve rod (5) and valve stem sleeve (19), the first sealing is provided in the gap and is filled out Expect (9), first airtight and watertight padding (9) uses graphite.

2. the hard sealing welding butterfly valve of double-shaft two-way according to claim 1, it is characterised in that: operating device (29) packet Valve seat briquetting (8) and valve plate (7) are included, the valve seat briquetting (8) is arranged on valve plate (7), and the valve seat briquetting (8) is fixedly connected Valve plate (7), the valve seat briquetting (8) and fixing shell device (30) are inconsistent, and the valve plate (7) includes bottom plate (71), sealing (72) and sealing plate (73) are enclosed, the valve rod (5) passes through bottom plate (71) and is fixedly connected with bottom plate (71) bolt, the sealing ring (72) It is arranged between bottom plate (71) and sealing plate (73), the bottom plate (71), sealing ring (72) and sealing plate (73) company of being bolted It connects, the valve plate (7) is circular valve plate, and the valve rod (5) passes through valve plate (7) center of circle.

3. the hard sealing welding butterfly valve of double-shaft two-way according to claim 2, it is characterised in that: the fixing shell device It (30) include valve seat (6), valve body (4), the second airtight and watertight padding (3), 3rd bearing (2), valve rod fixing sleeve (24) and bottom cover (1), Valve seat (6) setting is in valve body (4), and the valve seat (6) and valve seat briquetting (8) are inconsistent, the valve seat (6) and valve body (4) it is fixedly connected on the inside of, the valve body (4) is hollow tubular, is fixed on the outside of the valve body (4) with support housing (15) electric welding Connection is provided with valve rod fixing sleeve (24) on the outside of valve rod (5) bottom end, the valve rod fixing sleeve (24) and valve rod (5) it Between be provided with gap, be provided in the gap the second airtight and watertight padding (3), second airtight and watertight padding (3) use graphite, it is described Valve rod fixing sleeve (24) and valve body (4) electric welding are fixedly connected, and the valve rod (5) is arranged with bottom cover (1), the bottom cover (1) with Valve rod fixing sleeve (24) bolt is fixedly connected.

4. the hard sealing welding butterfly valve of double-shaft two-way according to claim 3, it is characterised in that: the valve seat (6) includes bullet Spring slot (66), spring (62), slide bar (63), baffle (64) and push rod (65), the spring groove (66) are medium altitude groove, the bullet The groove at spring slot (66) center is provided with spring (62), and the spring (62) is fixedly connected with spring groove (66), the spring groove (66) it is provided with slide bar (63) in, the slide bar (63) is slidably connected with spring groove (66), the spring groove (66) and valve body (4) It is fixedly connected, is provided with baffle (64) on the slide bar (63), the baffle (64) is fixedly connected with slide bar (63), the baffle (64) it is provided between spring (62) push rod (65), the push rod (65) is L shape, the vertical one end of the push rod (65) and slide bar (63) it is fixedly connected, the horizontal one end of the push rod (65) and valve seat briquetting (8) are inconsistent, the vertical edge and bullet of the push rod (65) Spring (62) is fixedly connected.

5. the hard sealing welding butterfly valve of double-shaft two-way according to claim 4, it is characterised in that: set in the turbine head (13) It is equipped with gear set (131), is provided with drive rod (25) on the handwheel (14), the drive rod (25) and handwheel (14) fixed company It connects, is provided with precision auger groove (251) on the drive rod (25), the gear set (131) and precision auger groove (251) Engagement connection, the valve rod (5) are protruded into turbine head (13) and are fixedly connected with gear set (131).