CN108980377A - The hard sealing welding butterfly valve of double-shaft two-way - Google Patents

Abstract

The invention discloses a biaxial bidirectional hard-seal welded butterfly valve, which includes a turbine driving device, a transmission device, a supporting device, an operating device and a fixed shell device. The turbine driving device includes a hand wheel and a turbine head, and the hand wheel is arranged on the turbine head. Above, the handwheel is connected to the turbine head in transmission, the turbine head is set on the transmission device, and the transmission device is connected to the turbine head in transmission, the invention drives the transmission device through the turbine drive device to drive the operating device in the support device The transmission work in the casing device, through the biaxial connection in the transmission device and the symmetrical design of the bearings, prevents the shaft bending of the transmission device connected to it due to excessive torque when the fluid medium generates excessive pressure on the valve plate surface. The structure of the valve seat and the valve seat pressing block enables the movable valve seat to be displaced to the fixed valve seat by the force of the fluid medium to achieve a two-way sealing effect with the best sealing effect and achieve the goal of zero leakage on both sides.

Description

Biaxial two-way hard seal welding butterfly valve

technical field

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

Background technique

With the rapid development of the world economy, today, oil and gas resources are in short supply and energy is in short supply, while the demand for oil and natural gas is increasing, so we have to turn to severe winters, deserts, swamps and New energy sources such as oceanic continental shelves have caused great difficulties in the transportation of 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 is by pipeline, and a single large-diameter, high-pressure transmission method is used to reduce investment and maintenance costs.

In the rapid development of the national economy, pipeline transportation has become an important transportation route for oil, gas and heating, and valves as pipeline control functions play an important role. In the pipeline systems of energy, metallurgy, petrochemical and other industries, various A variety of valves can be used to realize the functions of cut-off, regulation, pressure stabilization, diversion or overflow filling pressure, etc. The valve can be used to control the flow of 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, butterfly valves have been widely used due to their good cutting performance, minimal leakage, good regulation performance, high-speed flux, good corrosion resistance, small size, low weight, and easy configuration. Expanding, in addition to the initial application environment of normal temperature, low pressure and general media, in the chemical industry with severe corrosion, butterfly valves can almost replace the globe valves, plug valves and ball valves commonly used in the past in terms of application effects. In fact, in modern urban construction projects, due to the continuous improvement of environmental protection requirements, 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 butterfly plate 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 it will be on the valve body. There are arrows in the flow direction of the medium. When installing the one-way pressure-sealed 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, better than the one-way pressure-sealed butterfly valve is the two-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, but when in use, because the valve stem is under the pressure of the medium in two directions, in design, the valve stem of the two-way pressure-sealed butterfly valve is in the The diameter is often larger than that of the one-way pressure-sealed butterfly valve, but increasing the diameter of the valve stem and the pressure will cause wear and tear 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 excessive pressure on the butterfly plate, the valve stem will lift up or fall down in the valve stem shaft, which will easily cause the valve stem shaft to be damaged due to excessive torque. It will cause the shaft to bend, and it will also lead to poor sealing performance of the two-way pressure-sealed butterfly valve.

Contents of the invention

The object of the present invention is to provide a biaxial bidirectional hard-seal 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 biaxial bidirectional hard-seal welded butterfly valve includes 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. The hand wheel is connected to the turbine head by transmission, the turbine head is arranged on the transmission device, the transmission device is connected to the turbine head by transmission, the operating device is arranged on the transmission device, the transmission device and the operation device are fixedly connected by bolts, The support device is arranged between the transmission device and the fixed shell device, the support device is arranged outside the transmission device, the support device and the transmission device are fixedly connected by bolts, and the support device and the turbine head are fixedly connected by bolts, so The supporting device is fixedly connected with the fixed shell device by electric welding, the operating device is arranged in the fixed shell device, the transmission device extends into the fixed shell device, and the fixed shell 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 area and a lower support platform area, the support shell is arranged between the turbine head and the fixed shell device, and the support shell and 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 platform and the lower support platform are arranged inside the support shell, the upper support platform and the lower support platform are fixedly connected by bolts, the The support shell is hollow tubular, 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 biaxial fixing sleeve, an upper bearing, an upper nut, a lower nut, a lower bearing, a lower connecting half shaft, a lower biaxial 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 shell device, the valve stem is fixedly connected with the fixed shell device, and the valve stem is provided with The upper connecting half-shaft and the lower connecting half-shaft are arranged in the upper supporting platform area, and 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 The shaft and the upper nut are fixedly connected by threads, and the lower connecting half shaft and the lower nut are fixedly connected by threads. The upper nut is provided with an upper bearing, and the upper bearing is arranged on the outside of the upper connecting half shaft. The upper bearing An upper double-axis fixing sleeve is provided on the outer side of the upper double-axis fixing sleeve, and the upper double-axis fixing sleeve is nestedly connected with the upper bearing. The upper double-axis fixing sleeve is arranged on the upper nut, and the upper double-axis fixing sleeve is fixedly connected with the upper nut. A lower bearing is arranged under the lower nut, and the lower bearing is arranged on the outer side of the lower connecting half shaft, and the lower biaxial fixing sleeve is arranged on the outer side of the lower bearing, and the lower biaxial fixing sleeve is nestedly connected with the lower bearing, 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 supporting platform and the lower supporting platform, and the lower biaxial fixing sleeve A valve stem sleeve is provided, the lower biaxial fixed 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, and the valve stem and the valve stem There is a gap between the sleeves, and a first sealing packing is arranged in the gap, and the first sealing packing 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 with the fixed shell device The valve plate includes a bottom plate, a sealing ring and a sealing plate, the valve stem passes through the bottom plate and is fixedly connected to the bottom plate with bolts, 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 connected by bolts, and the valve plate is a circular valve plate, and the valve rod 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 contrast, 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 supporting shell by electric welding, and the outer side of the bottom end of the valve stem is provided with a valve stem fixing sleeve. There is a gap between the valve stem fixing sleeve and the valve stem, and a second sealing packing is arranged in the gap, and the second sealing packing is made of graphite, and the valve stem fixing sleeve is fixedly connected with the valve body by electric welding. A bottom cover is arranged under the stem, and the bottom cover is fixedly connected with the valve stem fixing sleeve by bolts.

As an optimization, the valve seat includes a spring groove, a spring, a slide bar, a retainer and a push rod, the spring groove is a hollow groove, the groove at 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 slide bar, the slide bar is slidably connected with the spring groove, the spring groove is fixedly connected with the valve body, the slide bar is provided with a baffle, and the baffle is fixedly connected with the slide bar , a push rod is arranged between the retainer and the spring, the push rod is L-shaped, the vertical end of the push rod is fixedly connected with the slide rod, and the horizontal end of the push rod is in conflict with the valve seat pressure block, so The vertical edge of the push rod is fixedly connected with the spring.

As an optimization, a gear set is arranged inside the turbine head, a transmission rod is provided on the hand wheel, the transmission rod is fixedly connected with the hand wheel, a precision spiral groove is provided on the transmission rod, and the gear set and the hand wheel are fixedly connected. The precision spiral groove is engaged and connected, and the valve stem extends into the turbine head and is fixedly connected with the gear set.

Compared with the prior art, the beneficial effect of the present invention is: the present invention drives the transmission device through the turbine drive device to drive the operating device in the support device to drive the transmission work in the fixed shell device, and through the biaxial connection in the transmission device and the symmetry of the bearing The design avoids that when the fluid medium generates excessive pressure on the valve plate surface, the transmission device connected to it will cause the shaft to bend due to excessive torque. In addition, through the structure of the valve seat and the valve seat pressing block, the movable valve seat can withstand the fluid medium. The acting force produces displacement to the fixed valve seat to achieve the effect of two-way sealing, the sealing effect is the best, and the goal of double-sided zero leakage is achieved.

Description of drawings

Fig. 1 is the side sectional view of the biaxial two-way hard seal welding butterfly valve of the present invention;

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

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

Fig. 4 is a structural schematic diagram of a valve seat and a valve seat briquetting block of a biaxial bidirectional hard-seal welded butterfly valve of the present invention;

Fig. 5 is a structural schematic diagram of a turbine drive device for a biaxial bidirectional hard-seal welded butterfly valve of the present invention.

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

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the embodiment of the present invention, as shown in Figure 1, the biaxial bidirectional hard-sealed welding butterfly valve includes a turbine drive device 26, a transmission device 27, a support device 28, an operating device 29 and a fixed housing device 30, and the turbine drive device 26 includes a hand wheel 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, the turbine head 13 is arranged on the transmission device 27, the transmission device 27 is connected with the turbine head 13, and the operating device 29 is set 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 shell device 30, the support device 28 is arranged on the outside of the transmission device 27, and the support device 28 and the transmission device 27 is fixedly connected by bolts, the support device 28 is fixedly connected with the turbine head 13 by bolts, the support device 28 is fixedly connected with the fixed shell device 30 by electric welding, the operating device 29 is arranged in the fixed shell device 30, and the transmission device 27 extends into the fixed shell device 30 , the fixed shell device 30 is fixedly connected with the transmission device 27 .

As shown in Figures 2 and 3, the supporting device 28 includes a supporting shell 15, an upper supporting platform 16, a lower supporting platform 17, an upper supporting platform area 161 and a lower supporting platform area 171, and the supporting housing 15 is arranged on the turbine head 13 and the fixed housing 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 platform 16 and the lower support platform 17 are arranged inside the support shell 15, and the upper support platform 16 and the The lower support platform 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 platform 16 is the upper support platform area 161, and the space formed by the support shell 15 and the lower support platform 17 is the lower support platform area 171.

As shown in Figure 2, the transmission device 27 includes a valve stem 5, an upper connecting half shaft 12, an upper biaxial fixed sleeve 20, an upper bearing 11, an upper nut 21, a lower nut 22, a lower bearing 18, a lower connecting half shaft 23, a lower Biaxial fixed sleeve 10, first sealing packing 9 and valve stem sleeve 19, valve stem 5 extends into turbine head 13 and is fixedly connected with turbine head 13, valve stem 5 passes through support device 28 and fixed shell device 30, valve stem 5 Fixedly connected with the fixed shell device 30, 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 platform area 161, and the upper connecting half shaft 12 and the outer side of the lower connecting half shaft 23 are provided with threads, the upper connecting half shaft 12 is fixedly connected with the upper nut 21 by threads, the lower connecting half shaft 23 and the lower nut 22 are fixedly connected by threads, and the upper nut 21 is provided with an upper bearing 11, The upper bearing 11 is arranged on the outer side of the upper connecting half-shaft 12, and the outer side of the upper bearing 11 is provided with an upper double-axis fixing sleeve 20, and the upper double-axis fixing sleeve 20 is nested and connected with the upper bearing 11, and the upper double-axis fixing sleeve 20 is arranged on the upper On the nut 21, the upper biaxial fixed 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 outside of the lower connecting half shaft 23, and the outer side of the lower bearing 18 is provided with a lower biaxial fixed Set 10, the lower biaxial fixed sleeve 10 is nestedly connected with the lower bearing 18, the lower biaxial fixed sleeve 10 is arranged under the lower nut 22, the lower biaxial fixed sleeve 10 is fixedly connected with the lower nut 22, and the lower biaxial fixed sleeve 10 passes through The upper support platform 16 and the lower support platform 17, the valve stem sleeve 19 is arranged under the lower biaxial fixed sleeve 10, the lower biaxial fixed sleeve 10 extends into the lower support platform area 171, and the valve stem sleeve 19 is arranged inside the lower support platform area 171, The valve stem sleeve 19 is arranged on the outside of the valve stem 5, and there is a gap between the valve stem 5 and the valve stem sleeve 19, and the first sealing packing 9 is arranged in the gap, and the first sealing packing 9 is made of graphite.

As shown in Figure 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 shell device 30 is in conflict with each other. The valve plate 7 includes a bottom plate 71, a sealing ring 72 and a sealing plate 73. The valve stem 5 passes through the bottom plate 71 and is fixedly connected with the bottom plate 71 by bolts. The sealing ring 72 is arranged between the bottom plate 71 and the sealing plate 73. The bottom plate 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 Figure 2, the fixed housing 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, and the valve seat 6 is arranged in the valve body 4, The valve seat 6 is in conflict 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 set There is a valve stem fixing sleeve 24, and there is a gap between the valve stem fixing sleeve 24 and the valve stem 5, and a second sealing packing 3 is arranged in the gap, and the second sealing packing 3 is made of graphite, and the valve stem fixing sleeve 24 is welded to the valve body 4 Fixedly connected, a bottom cover 1 is arranged 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 Figure 4, the valve seat 6 includes a spring groove 66, a spring 62, a slide bar 63, a catch 64 and a push rod 65, the spring groove 66 is a hollow groove, and the groove at the center of the spring groove 66 is provided with a spring 62, and the spring 62 is fixedly connected with the spring groove 66, and a slide bar 63 is arranged in the spring groove 66, and the slide bar 63 is slidably connected with the spring groove 66, and the spring groove 66 is fixedly connected with the valve body 4, and the slide bar 63 is provided with a stopper 64, and the stopper 64 is fixedly connected with the slide bar 63, and a push rod 65 is arranged between the retaining piece 64 and the spring 62. The push rod 65 is L-shaped, and the vertical end of the push rod 65 is fixedly connected with the slide bar 63. Block 8 is in conflict, and the vertical limit of push rod 65 is fixedly connected with spring 62.

As shown in Figure 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, the transmission rod 25 is provided with a precision spiral groove 251, the gear set 131 is meshed with the precision spiral groove 251, and the valve stem 5 extends into the turbine head 13 and is fixedly connected with the gear set 131.

In the present invention, the transmission device is driven by the turbine driving device to drive the operating device to work in the fixed shell device, and the biaxial connection in the transmission device and the symmetrical design of the bearing avoid excessive pressure of the fluid medium on the valve plate surface. The transmission device connected to it has the condition that the shaft is bent due to excessive torque. In addition, through the structure of the valve seat and the valve seat pressing block, the movable valve seat is displaced to the fixed valve seat by the force of the fluid medium to achieve two-way sealing. Effect, the best sealing effect, to achieve the purpose of double-sided zero leakage.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (7)

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).

2. the hard sealing welding butterfly valve of double-shaft two-way according to claim 1, it is characterised in that: support device (28) packet Include support housing (15), upper supporting table (16), lower supporting table (17), upper supporting table area (161) and lower supporting table area (171), institute It states support housing (15) to be arranged between turbine head (13) and fixing shell device (30), the support housing (15) and turbine head (13) it is bolted to connection, the support housing (15) is fixedly connected with fixing shell device (30) by electric welding, described , the upper supporting table (16) and lower supporting table internal in support housing (15) is arranged in upper supporting table (16) and lower supporting table (17) (17) it is bolted to connection, the support housing (15) is hollow tubular, the support housing (15) and upper supporting table (16) space formed is upper supporting table area (161), under the space that the support housing (15) and lower supporting table (17) are formed is Supporting table area (171).

3. the hard sealing welding butterfly valve of double-shaft two-way according to claim 2, it is characterised in that: transmission device (27) packet Include valve rod (5), upper connection semiaxis (12), upper twin shaft fixing sleeve (20), upper bearing (metal) (11), top nut (21), lower nut (22), under Bearing (18), lower connection semiaxis (23), lower twin shaft fixing sleeve (10), the first airtight and watertight padding (9) and valve stem sleeve (19), the valve rod (5) it protrudes into turbine head (13) and is fixedly connected with turbine head (13), the valve rod (5) passes through support device (28) and fixing shell Device (30), the valve rod (5) are fixedly connected with fixing shell device (30), and connection half is provided on the outside of the valve rod (5) Axis (12) and lower connection semiaxis (23), the upper connection semiaxis (12) and lower connection semiaxis (23) are arranged in upper supporting table area (161) in, the upper connection semiaxis (12) and lower connection semiaxis (23) outside are provided with screw thread, the upper connection semiaxis (12) and Top nut (21) is threadably secured connection, and the lower connection semiaxis (23) is threadably secured with lower nut (22) to be connect, institute It states and is provided on top nut (21) upper bearing (metal) (11), the upper bearing (metal) (11) setting is described in the outside of upper connection semiaxis (12) It is provided on the outside of upper bearing (metal) (11) twin shaft fixing sleeve (20), the upper twin shaft fixing sleeve (20) is nested with upper bearing (metal) (11) even It connects, the upper twin shaft fixing sleeve (20) is arranged on top nut (21), and the upper twin shaft fixing sleeve (20) and top nut (21) are solid Fixed connection, the lower nut (22) are arranged with lower bearing (18), and lower bearing (18) setting is in lower connection semiaxis (23) Outside is provided with lower twin shaft fixing sleeve (10), the lower twin shaft fixing sleeve (10) and lower bearing on the outside of the lower bearing (18) (18) nested encryptions, the lower twin shaft fixing sleeve (10) are arranged under lower nut (22), and the lower twin shaft fixing sleeve (10) is under Nut (22) is fixedly connected, the lower twin shaft fixing sleeve (10) pass through upper supporting table (16) and lower supporting table (17), described lower pair Axis fixing sleeve (10) is arranged with valve stem sleeve (19), and the lower twin shaft fixing sleeve (10) protrudes into lower supporting table area (171), the valve Rod set (19) setting is internal in lower supporting table area (171), and valve stem sleeve (19) setting is on the outside of valve rod (5), the valve rod (5) It is provided with gap between valve stem sleeve (19), is provided in the gap the first airtight and watertight padding (9), first airtight and watertight padding (9) graphite is used.

4. the hard sealing welding butterfly valve of double-shaft two-way according to claim 3, 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.

5. the hard sealing welding butterfly valve of double-shaft two-way according to claim 4, 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.

6. the hard sealing welding butterfly valve of double-shaft two-way according to claim 5, 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.

7. the hard sealing welding butterfly valve of double-shaft two-way according to claim 6, 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).