CN220770185U

CN220770185U - Low-torque long-life ball valve

Info

Publication number: CN220770185U
Application number: CN202321800510.8U
Authority: CN
Inventors: 方忠恕; 邵素曼; 邢志礼
Original assignee: LISHUI OUYI VALVE CO Ltd
Current assignee: LISHUI OUYI VALVE CO Ltd
Priority date: 2023-07-10
Filing date: 2023-07-10
Publication date: 2024-04-12
Anticipated expiration: 2033-07-10

Abstract

The utility model discloses a low-torque long-life ball valve which comprises a valve body, wherein a transverse flow channel is formed in the valve body, a valve core for opening and closing the flow channel is arranged in the valve body, valve seats spliced at the transverse flow channel are arranged on the left side and the right side of the valve core, sealing rings are arranged on the two valve seats, a group of compression springs are arranged on the valve body, a dovetail slot formed in the valve body is arranged at the side end of the valve seat, a dovetail block matched with the dovetail slot in a splicing manner is fixed on the valve seat, a first O-shaped sealing ring matched with the dovetail block is arranged on the dovetail slot, and a driving mechanism for moving the valve seats and separating the sealing rings from the spherical surface of the valve core is arranged on the valve body. The utility model has ingenious and reasonable structural design, can lead the sealing ring on the valve seat to be separated from the valve core in the process of fully opening or fully closing the ball valve, thereby avoiding the excessive abrasion of the sealing ring and reducing the service life.

Description

Low-torque long-life ball valve

Technical Field

The utility model relates to an opening and closing device, in particular to a valve, and particularly relates to a low-torque long-service-life ball valve.

Background

The ball valve, the opening and closing piece (sphere) is driven by the valve rod, and the valve rotates around the axis of the ball valve; the device can also be used for regulating and controlling the fluid; the ball valve is more and more widely applied due to stability, high pressure resistance and convenient processability, along with increasing high pressure and high performance of the current working condition environment, along with increasing of working pressure of the ball valve application, the operating moment of the ball valve is larger and larger, the test of a sealing ring is also increased, under the working condition of a high pressure medium, the friction force of the valve core on the sealing ring is extremely large in the process of fully opening or fully closing the ball valve due to large medium pressure in the process of fully opening or fully closing the ball valve, the sealing ring is quickly worn, and the sealing ring is required to be overhauled and replaced by a frequently closed pipeline under the high pressure working condition environment requiring frequent opening and closing of the pipeline, so that the maintenance cost of a pipeline is high, and the profitability of enterprises is reduced.

Chinese patent No. CN 203189774U discloses a ball valve structure for keeping clean in ball valve, the ball valve includes a valve body, a valve rod and a ball valve arranged in the valve body, one end of the valve rod is fixedly connected with the ball valve, the other end extends out of the valve body and forms a seal with the valve body, a sealing ring is arranged between the ball valve and the valve body, a water inlet end and a water outlet end are arranged on the valve body, a channel capable of conducting the water inlet end and the water outlet end is arranged in the ball valve, a cavity is formed among the valve body, the valve rod, the ball valve and the sealing ring, and a through hole for communicating the cavity with the channel is arranged at the bottom of the ball valve. Under the high-pressure medium impact environment, the ball valve is impacted by the medium and can be tightly pressed at the sealing ring on the pressed side, when the ball valve is driven by the valve rod, the friction force of the surface of the ball valve to the sealing ring is large, the abrasion is large, the sealing ring needs to be replaced frequently in the environment of working condition needing to be normal, the sealing ring is replaced by stopping conveying the medium frequently, so that small economic loss can be caused, enterprise profit is reduced, and the development of enterprises is not facilitated.

Disclosure of Invention

The utility model aims to solve the defects of the prior art, and provides the low-torque long-service-life ball valve which has small friction resistance, is separated from the surface of the valve core in the process of opening and closing the ball valve, has extremely small abrasion of the sealing ring and long service life, and meets the requirements of long service life, small resistance and low torque on-and-off of the ball valve in the process of using the ball valve.

The utility model solves the technical problems by adopting the technical scheme that: the bottom torque long-life ball valve comprises a valve body, wherein a transverse flow channel is formed in the valve body, a valve core for opening and closing the flow channel is arranged in the valve body, valve seats spliced at the transverse flow channel are arranged on the left side and the right side of the valve core, sealing rings are arranged on the two valve seats, a group of compression springs for driving the valve seats to move towards the spherical surface of the valve core and enabling the sealing rings to be pressed on the spherical surface of the valve core are arranged on the valve body, a dovetail slot formed in the valve seat is formed in the side end of the valve seat, a dovetail block matched with the dovetail slot in a splicing manner is fixed on the valve seat, a first O-shaped sealing ring matched with the dovetail block is arranged on the dovetail slot, and at least two driving mechanisms for enabling the valve seats to move and enabling the sealing rings to be separated from the spherical surface of the valve core are arranged on the valve body; the driving mechanism comprises a guide hole which is arranged on the valve body, a traction rope is arranged at the guide hole, the traction rope is a steel wire rope, a bracket is arranged on the valve body, a first electric cylinder is fixed on the bracket, one end of the traction rope penetrates through the compression spring to be fixed with the side end of the valve seat, and the other end of the traction rope is fixed with the head end of a piston rod of the first electric cylinder; the bottom of the valve core is provided with a round hole, the bottom of the valve body is provided with a mounting hole, a thrust bearing is mounted at the mounting hole, a support column is arranged on the thrust bearing at intervals, the support column comprises a first cylinder, a second cylinder and a third cylinder, the section of the first cylinder is smaller than that of the second cylinder, the section of the second cylinder is smaller than that of the third cylinder, the first cylinder is matched with the round hole and enables the bottom of the valve core to be arranged on the top surface of the second cylinder at intervals, a bearing is sleeved on the second cylinder, a bearing inner ring is arranged on the top surface of the third cylinder at intervals, a transverse limiting hole is formed in the valve body, and a bearing outer ring is matched with the transverse limiting hole; the valve core is provided with a jack, the section of the jack is circular, a bushing is fixed on the valve body of the jack through a fastener, the bushing is inserted in the jack, the bushing is rotationally connected with a valve rod for driving the valve core to rotate, and the bushing longitudinally limits the valve rod to be separated from the bushing. The valve body, the transverse flow channel and the valve core have the function of opening and closing the pipeline; the valve seat, the sealing ring and the compression spring have the functions of sealing the valve core, and the compression spring can keep the valve seat to press towards the spherical surface of the valve core, so that the sealing effect is good, and when the sealing ring is worn, the position of the sealing ring can be compensated, so that the sealing ring can be used for a long time; the dovetail slot, the dovetail block and the first O-shaped sealing ring have the functions that a medium does not flow into the position of the compression spring, so that the condition that the compression spring is contacted with the medium for a long time to cause elastic failure is avoided; the driving mechanism has the effects that the valve seat can be driven to move in the closing or opening process of the valve core, so that the sealing ring is separated from the compression of the valve core, and when the valve core reaches the full closing position or the full opening position, the sealing ring on the valve seat is compressed on the surface of the valve core again, so that the sealing effect is played again, and the sealing ring is not contacted with the surface of the valve core in the rotating process of the valve core, so that the sealing ring is not worn, the service life of the ball valve is greatly prolonged (only the sealing ring is replaced after being aged); the round hole, the mounting hole, the thrust bearing and the support column have the function of longitudinally supporting the valve core, so that the valve core is prevented from being pressed at the bottom of the sealing ring, and the sealing ring is prevented from being worn too fast; the transverse limiting hole, the bearing and the bushing have the functions of providing the valve core with transverse limiting support, so that the valve core is prevented from being pressed tightly on the sealing ring when being pushed by a medium and shifted, the abrasion of the sealing ring is small when the valve core is opened and closed, the service life of the sealing ring can be greatly prolonged, and the service life of the ball valve can be prolonged; the valve rod can drive the valve core to rotate fast and conveniently.

Further perfectedly, the valve body top is fixed with the support, is fixed with the installing frame on the support, and the top of valve rod is located the installing frame, and the top of valve rod is fixed with the gear, and installing frame department sliding connection has the rack together with gear engagement, and installing frame internal fixation has the second electronic jar that drives the rack and remove, installs the singlechip controller in the installing frame, installs starting switch in installing frame department, and the singlechip controller is in the same place with first electronic jar, second electronic jar and starting switch circuit connection. The support and the mounting frame have the functions that the second electric cylinder can be lifted, so that the driving gear is facilitated to rotate, and the valve rod is facilitated to rotate; the gear, the rack and the second electric cylinder have the functions that the rack is pulled to move by using the pulling force generated by the second electric cylinder, so that the gear is driven to rotate, the valve rod is driven to rotate, the valve core is rotated, and the purpose of opening and closing the ball valve is achieved; the singlechip controller has the functions of controlling the first electric cylinder to be started in advance, enabling the sealing ring to be separated from the valve core, starting the second electric cylinder to rotate the valve core, and controlling the piston rod on the first electric cylinder to move downwards after the valve core rotates to the closing position or the opening position of the ball valve, so that the sealing ring is pressed on the spherical surface of the valve core again; the starting switch has the function of controlling the low-torque long-life opening or the low-torque long-life labor-saving closing of the ball valve through the key; the SCM controller is available in market, and can be selected from Feisha card, ruisha electronic, ying Fei Ling, toshiba, etc.

Further perfecting, the outer contour surface of the valve seat is provided with a self-lubricating layer. The self-lubricating layer has the advantages that the friction force between the valve seat and the valve body is extremely low, the situation that the valve seat is slightly blocked in the moving process can be avoided, and therefore the self-lubricating layer can enable the valve seat to move with extremely low friction force and extremely low resistance, and move more smoothly; the self-lubricating layer is made of a tin bronze material, and the tin bronze material has self-lubricating property.

Further perfecting, a ring pressing block for preventing the sealing ring from falling off from the side end of the valve seat is fixed on the valve seat. The annular pressing block has the advantages that the sealing ring can be pressed on the valve seat, the problem that the sealing ring is separated from the valve seat due to the pressure of external media can be avoided, and the annular pressing block can be convenient to install and replace the sealing ring.

Further perfecting, the left and right sides of the bottom end of the valve body are provided with supporting feet. The supporting legs have the effect that the ball valve can be conveniently placed on the supporting plane, and the ball valve and the pipeline are conveniently installed.

Further perfecting, the valve body comprises a left valve part and a right valve part, an upper valve part and a lower valve part are arranged between the left valve part and the right valve part, and the left valve part and the right valve part are fixed at the upper valve part and the lower valve part through fasteners. The valve body adopts the form of assembling the left valve part, the right valve part, the upper valve part and the lower valve part, so that the production cost is low, the valve body is easier to install, compared with the traditional valve body casting mode, the valve body is low in production cost, the valve body is easier to install, pollution generated by casting is large, and the valve body adopts an assembling form and is more friendly to the environment.

The beneficial effects of the utility model are as follows:

1) The thrust bearing is adopted to longitudinally support the valve core, and the bearing and the bushing are adopted to transversely limit the valve core, so that the valve core has small pressure and small friction resistance acting on the sealing ring in the process of opening or closing the valve core, and the aim of rotating the ball valve with low torque is fulfilled;

2) The valve core of the traditional ball valve is prevented from being non-longitudinal through the longitudinal support of the thrust bearing, so that the gravity of the valve core can be pressed on the lower part of the sealing ring, and the lower part of the sealing ring is worn too quickly in the process of rotating the valve core, so that the sealing ring of the ball valve needs to be replaced frequently;

3) The valve core can be prevented from being pushed and shifted by a medium through the bearing and the bushing, so that the valve core is prevented from being pressed on the sealing ring passively, the abrasion of the sealing ring is small when the valve core is opened and closed, the service life of the sealing ring can be greatly prolonged, and the service life of the ball valve can be prolonged;

4) The valve seat can be pulled to move in the process of opening or closing the ball valve through the guide hole, the traction rope and the first electric cylinder, so that the sealing ring is separated from the valve core, when the valve core is closed or opened, the piston rod on the first electric cylinder moves downwards, so that the sealing ring is pressed on the valve core again under the action of the elasticity of the compression spring when the valve core is in a fully closed state or in a fully opened state, the sealing effect on the valve core is achieved, and the sealing ring cannot be worn in a manner that the sealing ring is separated from the valve core in the process of rotating the valve core, so that the service life of the ball valve is greatly prolonged.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an enlarged partial view of area A of FIG. 1;

FIG. 3 is an enlarged partial view of region B of FIG. 1;

FIG. 4 is an enlarged partial view of region C of FIG. 1;

FIG. 5 is a view D view of FIG. 1;

fig. 6 is a flow chart of the working principle of the utility model when continuously working.

Reference numerals illustrate: the valve comprises a valve body 1, a transverse runner 1-1, a dovetail slot 1-2, a guide hole 1-3, a mounting hole 1-4, a transverse limiting hole 1-5, a left valve part 1a, a right valve part 1b, an upper valve part 1c, a lower valve part 1d, a valve core 2, a round hole 2-1, an insertion hole 2-2, a valve seat 3, a self-lubricating layer 3a, a dovetail block 3-1, a sealing ring 4, a compression spring 5, a first O-shaped sealing ring 6, a driving mechanism 7, a traction rope 7-1, a bracket 7-2, a first electric cylinder 7-3, a thrust bearing 8, a support column 9, a first cylinder 9a, a second cylinder 9b, a third cylinder 9c, a bearing 10, a sleeve 11, a valve rod 12, a support 13, a mounting frame 14, a rack 14-1, a gear 15, a rack 15, a second electric cylinder 16, a singlechip controller 17, a starting switch 18, a ring pressing block 19 and a support foot 20.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

referring to the drawings: the bottom torque long-life ball valve comprises a valve body 1, wherein a transverse flow channel 1-1 is arranged on the valve body 1, a valve core 2 for opening and closing the flow channel is arranged in the valve body 1, valve seats 3 spliced at the position of the transverse flow channel 1-1 are arranged on the left side and the right side of the valve core 2, sealing rings 4 are arranged on the two valve seats 3, a group of compression springs 5 which drive the valve seats 3 to move towards the spherical direction of the valve core 2 and enable the sealing rings 4 to press on the spherical surface of the valve core 2 are arranged on the valve body 1, a dovetail slot 1-2 which is arranged on the valve seat 3 is arranged at the side end of the valve seat 3, a dovetail block 3-1 which is spliced and matched with the dovetail slot 1-2 is fixed on the valve seat 3, a first O-shaped sealing ring 6 which is matched with the dovetail block 3-1 is arranged on the dovetail slot 1-2, and at least two driving mechanisms 7 which are used for moving the valve seats 3 and enabling the sealing rings 4 to be separated from the spherical surface of the valve core 2 are arranged on the valve body 1; the driving mechanism 7 comprises a guide hole 1-3 which is formed in the valve body 1, a traction rope 7-1 is arranged at the guide hole 1-3, the traction rope 7-1 is a steel wire rope, a support 7-2 is arranged on the valve body 1, a first electric cylinder 7-3 is fixed on the support 7-2, one end of the traction rope 7-1 penetrates through the compression spring 5 to be fixed with the side end of the valve seat 3, and the other end of the traction rope 7-1 is fixed with the head end of a piston rod of the first electric cylinder 7-3; the bottom of the valve core 2 is provided with a round hole 2-1, the bottom of the valve body 1 is provided with a mounting hole 1-4, a thrust bearing 8 is arranged at the mounting hole 1-4, a support column 9 is arranged on the thrust bearing 8 in a spacing way, the support column 9 comprises a first cylinder 9a, a second cylinder 9b and a third cylinder 9c, the section of the first cylinder 9a is smaller than that of the second cylinder 9b, the section of the second cylinder 9b is smaller than that of the third cylinder 9c, the first cylinder 9a is matched with the round hole 2-1 and enables the bottom of the valve core 2 to be arranged on the top surface of the second cylinder 9b in a spacing way, a bearing 10 is sleeved on the second cylinder 9b, the inner ring of the bearing 10 is arranged on the top surface of the third cylinder 9c in a spacing way, the valve body 1 is provided with a transverse spacing hole 1-5, and the outer ring of the bearing 10 is matched with the transverse spacing hole 1-5; the valve core 2 is provided with a jack 2-2, the section of the jack 2-2 is circular, a bushing 11 is fixed on the valve body 1 through a fastener, the bushing 11 is inserted at the jack 2-2, a valve rod 12 for driving the valve core 2 to rotate is rotationally connected at the bushing 11, and the bushing 11 longitudinally limits the valve rod 12 to be separated from the bushing 11.

The top of the valve body 1 is fixed with a support 13, a mounting frame 14 is fixed on the support 13, the top of the valve rod 12 is positioned in the mounting frame 14, a gear 15 is fixed on the top of the valve rod 12, a rack 14-1 meshed with the gear 15 is slidably connected to the mounting frame 14, a second electric cylinder 16 for driving the rack 14-1 to move is fixed in the mounting frame 14, a singlechip controller 17 is installed in the mounting frame 14, a starting switch 18 is installed at the mounting frame 14, and the singlechip controller 17 is connected with the first electric cylinder 7-3, the second electric cylinder 16 and the starting switch 18 in a circuit manner.

The outer contour surface of the valve seat 3 is provided with a self-lubricating layer 3a.

The valve seat 3 is fixed with a circular ring pressing block 19 for preventing the sealing ring 4 from falling out of the side end of the valve seat 3.

Support legs 20 are arranged on the left side and the right side of the bottom end of the valve body 1.

The valve body 1 includes a left valve portion 1a and a right valve portion 1b, an upper valve portion 1c and a lower valve portion 1d are provided between the left valve portion 1a and the right valve portion 1b, and the left valve portion 1a and the right valve portion 1b are fixed to the upper valve portion 1c and the lower valve portion 1d by fasteners.

The working principle of the utility model is as follows: when the ball valve is required to be closed, only the start switch 18 needs to be pressed, so that the singlechip controller 17 firstly controls the piston rod on the first electric cylinder 7-3 to move upwards for resetting, thereby pulling the traction rope 7-1, further moving the valve seat 3 towards the side direction of the compression spring 5, thereby enabling the compression spring 5 to be compressed for storing energy, at the moment, the sealing ring 4 is separated from the surface of the valve core 2, and then the singlechip controller 17 starts the second electric cylinder 16, so that the second electric cylinder 16 moves the rack 14-1, thereby driving the gear 15 to rotate clockwise, the gear 15 rotates clockwise by 90 degrees, the valve core 2 performs full closing operation (as shown in figure 6) on the ball valve, the piston rod on the first electric cylinder 7-3 is moved downwards through the singlechip controller 17 after the valve core 2 performs full closing operation on the ball valve, so that the traction rope 7-1 loses traction on the valve seat 3, the valve seat 3 compresses the surface of the valve core 2 again through the elastic force of the compression spring 5 (at this time, the traction rope 7-1 is in a loose state and leaves a waveform allowance which is not in traction, as shown in figure 2), because the valve core is in the process of closing the ball valve, the sealing ring 4 is not contacted with the surface of the valve core 2, the valve core 2 is limited through the longitudinal support of the thrust bearing 8 and the supporting rod 9, the valve core 2 is limited through the transverse support of the transverse limiting hole 1-5, the bearing 10 and the bushing 11, so that the valve core 2 is very labor-saving to rotate, the rack 14-1 drives the large gear 15 to rotate, the labor-saving effect can be achieved, the valve rod 12 drives the valve core 2 to rotate, the low torque can be achieved, and the sealing ring 4 can achieve the long service life effect, the ball valve can achieve the effects of low torque and long service life;

when the ball valve needs to be opened, the starting switch 18 is only needed to be pressed again, so that the singlechip controller 17 firstly controls the piston rod on the first electric cylinder 7-3 to move upwards for resetting, thereby pulling the traction rope 7-1, further moving the valve seat 3 towards the side direction of the compression spring 5, thereby enabling the compression spring 5 to be compressed for storing energy, at the moment, the sealing ring 4 is separated from the surface of the valve core 2, and then the singlechip controller 17 starts the second electric cylinder 16, so that the second electric cylinder 16 resets the rack 14-1, thereby driving the gear 15 to rotate anticlockwise, the gear 15 rotates anticlockwise for 90 degrees, thereby fully opening the ball valve by the valve core 2, and then, after fully opening the ball valve by the valve core 2, the piston rod on the first electric cylinder 7-3 is moved downwards by the singlechip controller 17, thereby enabling the traction rope 7-1 to lose the traction of the valve seat 3, and the valve seat 3 compresses the surface of the valve core 2 again through the elastic force of the compression spring 5, thereby playing a role in sealing the ball valve.

The utility model has ingenious and reasonable structural design, can lead the sealing ring 4 on the valve seat 3 to be separated from the spherical surface of the valve core 2 in the process of fully opening or fully closing the ball valve, thereby avoiding the excessive abrasion of the sealing ring 4 and reducing the service life, and the valve core 2 adopts the low resistance arrangement of the bearing 10 and the bushing 11 with the thrust bearing 8, can open and close the ball valve in a labor-saving way, and is worthy of popularization and application.

While the utility model has been shown and described with reference to a preferred embodiment, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the utility model.

Claims

1. The utility model provides a low moment of torsion long-life ball valve, includes valve body (1), it has transverse flow way (1-1), characterized by to open on valve body (1): the valve is characterized in that a valve core (2) for opening and closing a flow passage is arranged in the valve body (1), valve seats (3) spliced at the positions of the transverse flow passage (1-1) are arranged on the left side and the right side of the valve core (2), sealing rings (4) are arranged on the two valve seats (3), a compression spring (5) for driving the valve seat (3) to move towards the spherical surface of the valve core (2) and enabling the sealing rings (4) to be pressed on the spherical surface of the valve core (2) is arranged on the valve body (1), a dovetail slot (1-2) formed in the valve seat (3) is arranged at the side end of the valve seat (3), a dovetail block (3-1) spliced and matched with the dovetail slot (1-2) is fixed on the valve seat (3), a first O-shaped sealing ring (6) matched with the dovetail block (3-1) is arranged on the valve body (1), and a driving mechanism (7) for moving the valve seat (3) and enabling the sealing rings (4) to be separated from the spherical surface of the valve core (2) is arranged on the valve body (1);

the driving mechanism (7) comprises a guide hole (1-3) which is formed in the valve body (1), a traction rope (7-1) is arranged at the guide hole (1-3), a support (7-2) is arranged on the valve body (1), a first electric cylinder (7-3) is fixed on the support (7-2), one end of the traction rope (7-1) penetrates through a compression spring (5) to be fixed with the side end of the valve seat (3), and the other end of the traction rope (7-1) is fixed with the head end of a piston rod of the first electric cylinder (7-3);

the valve comprises a valve body (1), and is characterized in that a round hole (2-1) is formed in the bottom of the valve body (2), a mounting hole (1-4) is formed in the bottom of the valve body (1), a thrust bearing (8) is mounted at the mounting hole (1-4), a supporting column (9) is arranged on the thrust bearing (8) in a spaced mode, the supporting column (9) comprises a first cylinder (9 a), a second cylinder (9 b) and a third cylinder (9 c), the cross section of the first cylinder (9 a) is smaller than the cross section of the second cylinder (9 b), the cross section of the second cylinder (9 b) is smaller than the cross section of the third cylinder (9 c), the first cylinder (9 a) is matched at the round hole (2-1) and enables the bottom of the valve body (2) to be arranged on the top surface of the second cylinder (9 b), a bearing (10) is sleeved on the second cylinder (9 b), the inner ring of the bearing (10) is arranged on the third cylinder (9 c) in a spaced mode, a transverse limiting hole (1-5) is formed in the valve body (1), and the outer ring is matched with the bearing (10) in the transverse limiting hole (1-5 position;

the valve is characterized in that the valve core (2) is provided with a jack (2-2), the valve body (1) is fixedly provided with a bushing (11) through a fastener, the bushing (11) is inserted into the jack (2-2), the bushing (11) is rotationally connected with a valve rod (12) for driving the valve core (2) to rotate, and the bushing (11) longitudinally limits the valve rod (12) to be separated from the bushing (11).

2. The low torque, long life ball valve of claim 1 wherein: the valve is characterized in that a support (13) is fixed at the top end of the valve body (1), a mounting frame (14) is fixed on the support (13), the top of the valve rod (12) is located in the mounting frame (14), a gear (15) is fixed at the top end of the valve rod (12), a rack (14-1) meshed with the gear (15) is slidably connected at the mounting frame (14), a second electric cylinder (16) for driving the rack (14-1) to move is fixed in the mounting frame (14), a single chip microcomputer controller (17) is installed in the mounting frame (14), a starting switch (18) is installed at the mounting frame (14), and the single chip microcomputer controller (17) is connected with the first electric cylinder (7-3), the second electric cylinder (16) and the starting switch (18) in a line mode.

3. The low torque, long life ball valve of claim 1 wherein: the outer contour surface of the valve seat (3) is provided with a self-lubricating layer (3 a).

4. The low torque, long life ball valve of claim 1 wherein: the valve seat (3) is fixedly provided with a circular ring pressing block (19) for preventing the sealing ring (4) from falling off from the side end of the valve seat (3).

5. The low torque, long life ball valve of claim 1 wherein: support feet (20) are arranged on the left side and the right side of the bottom end of the valve body (1).

6. The low torque, long life ball valve of claim 1 wherein: the valve body (1) comprises a left valve part (1 a) and a right valve part (1 b), an upper valve part (1 c) and a lower valve part (1 d) are arranged between the left valve part (1 a) and the right valve part (1 b), and the left valve part (1 a) and the right valve part (1 b) are fixed at the upper valve part (1 c) and the lower valve part (1 d) through fasteners.