CN212203203U

CN212203203U - Bidirectional pressure eccentric half ball valve

Info

Publication number: CN212203203U
Application number: CN202020345961.7U
Authority: CN
Inventors: 王志坚; 李智
Original assignee: Tianjin Krs Valve Co ltd
Current assignee: Tianjin Krs Valve Co ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-12-22
Anticipated expiration: 2030-03-18

Abstract

The utility model provides a two-way eccentric hemisphere valve of pressing belongs to the valve field, including valve body, spheroid, spherical crown and disk seat, the spheroid is established just at the valve body internal rotation in the valve body, the spherical crown sets firmly on the spheroid and with the disk seat matches the opening and closing control that sets up the realization pipeline, the disk seat sets up the axial one end of valve body the axis direction of disk seat, one end are fixed through the end cover, and the other end is fixed through the spacing arch of valve body downwardly extending, and the disk seat can be followed its axis direction and slided between end cover and spacing arch, the disk seat is close to one side of end cover is equipped with a plurality of medium blind holes that allow the medium to flow in. The utility model discloses the leakproofness is good, and installation convenient operation is swift, makes things convenient for the maintenance in later stage moreover, is fit for the valve for the requirement of all kinds of general trades, like medium such as water, sewage, waste water, steam, gas, paper pulp, metallurgy, ore dressing, electric power, urban heating system.

Description

Bidirectional pressure eccentric half ball valve

Technical Field

The utility model belongs to the valve field relates to two-way eccentric half ball valve of pressure.

Background

The hemisphere valve is a practical operation type product, and the actuating mechanism is provided with a hydraulic actuating device, so that the hemisphere valve is convenient for a user to operate and is convenient for remote automatic operation, and provides a reliable control valve for the predicament that the solution process flow of industrial departments such as chemical industry, petroleum, gas, metallurgy, electronics and the like is easy to precipitate, scale and separate out to influence the process flow under the matched automatic computer operation condition when the hemisphere valve is inconvenient to operate and is manually operated or normally opened under the severe environment.

In the long-term use process of the hemispherical valve, parameters such as sealing performance, convenience in maintenance, service life and the like are indexes for considering the quality of the valve, and the parameters are very important, so that the technical indexes of all aspects are improved by a new generation of products researched and developed by the company on the basis of old products.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide two-way eccentric half ball valve of pressing, the leakproofness is good, and installation convenient operation is swift, makes things convenient for the maintenance in later stage moreover, is fit for the valve for the requirement of all kinds of general trades, like medium such as water, sewage, waste water, steam, gas, paper pulp, metallurgy, ore dressing, electric power, urban heating system.

In order to solve the technical problem, the utility model discloses a technical scheme is: the bidirectional pressing eccentric half-ball valve comprises a valve body, a ball crown and a valve seat, wherein the ball body is arranged in the valve body and rotates in the valve body, the ball crown is fixedly arranged on the ball body and matched with the valve seat to realize opening and closing control of a pipeline, and the valve seat is arranged at one axial end of the valve body;

in the axial direction of the valve seat, one end of the valve seat is fixed through the end cover, the other end of the valve seat is fixed through the limiting protrusion extending downwards of the valve body, the valve seat can slide along the axial direction between the end cover and the limiting protrusion, and one side, close to the end cover, of the valve seat is provided with a plurality of medium blind holes allowing media to flow in.

Furthermore, the quantity of medium blind hole be a plurality of and relative the axis direction equipartition setting of disk seat, the axis of medium blind hole with the axis parallel arrangement of disk seat.

Furthermore, the sealing pair corresponding to the spherical crown and the valve seat is spherical, a sealing ring for ensuring the sealing of the spherical crown and the ball body is arranged between the spherical crown and the ball body, and a fastening gap for compensation is arranged between the inner side of the outer ring of the spherical crown and the ball body in the state that the spherical crown is fixedly locked.

Furthermore, a sealing pair formed by the spherical crown and the valve seat adopts a metal-to-metal structure, hard alloy is welded on the valve seat in a surfacing mode, and the spherical crown is made of alloy steel.

Furthermore, the spheroid is U-shaped structure and both sides are outwards protruding to become the arc, spheroid's rotation angle is 90 degrees, the valve body with fix the part that spherical crown and spheroid motion trajectory correspond is the spherical surface structure.

Furthermore, one side of the ball body is rotatably connected with the valve body through a first valve rod, the other side of the ball body is rotatably connected with the valve body through a second valve rod, and the part of the first valve rod, which extends out of the valve body, is connected with an external driving device.

Further, be equipped with the adapter sleeve between first valve rod and the spheroid, in the axis direction of adapter sleeve, one end is fixed a position by the circular bead structure of first valve rod, and the other end is fixed a position by the protruding location that downwardly extending set up on the spheroid, and the cooperation section of first valve rod and adapter sleeve is regular polyhedral shape structure, is equipped with the valve pin of guaranteeing the three relative position between spheroid, adapter sleeve and the first valve rod three, is equipped with the locking groove that corresponds with the valve pin on the adapter sleeve, and the valve pin passes and stretches into behind the spheroid and sets up in the locking groove.

Furthermore, the first valve rod is rotatably connected with the valve body through a self-lubricating bearing, a shaft seal is arranged between one end, far away from the ball body, of the first valve rod and the valve body, the shaft seal is positioned through a sealing cover fixedly locked on the valve body, the second valve rod is rotatably connected with the valve body through the self-lubricating bearing, and one end, far away from the ball body, of the second valve rod is fixed through a bottom end cover.

Furthermore, the outer lane of bearing seal is equipped with at least one and places the sealing washer and be used for realizing the sealed constant head tank of outer lane, and the inner circle of bearing seal is equipped with at least one and places the sealing washer and be used for realizing the sealed constant head tank of inner circle.

Furthermore, the valve body is designed to be a horizontal structure, the ball body is horizontally arranged relative to the rotating shaft of the valve body, the upper end of the valve body is provided with a valve cover convenient to maintain, and the ball body is arranged in the coverage area of the valve cover when the valve body is opened.

Compared with the prior art, the utility model has the advantages and positive effect as follows.

1. The utility model discloses in the axis direction of disk seat, the disk seat can remove, under the closed condition, when the medium flowed in, the medium entered into the medium blind hole, guaranteed that the disk seat is inseparabler and the laminating of spherical crown, promoted sealing performance, adopt to have compensation formula activity disk seat, namely the disk seat can make reciprocating motion along the fluid passage direction of hemisphere valve, can guarantee that the disk seat is laminated with the spherical crown body all the time like this, can realize two-way pressure-bearing and can realize sealed zero leakage, can satisfy the user and need two flow to the medium pipeline and require the zero operating mode of sealed leakage;

2. a fastening gap for compensation is arranged between the inner side of the outer ring of the spherical crown and the ball body, the spherical crown can be further locked under the condition of abrasion of the spherical crown, the fastening gap provides a deformation space, accurate positioning after abrasion of the spherical crown is guaranteed, fastening and fixation are guaranteed, looseness is avoided, the spherical crown is matched with a compensating valve seat, sealing performance is guaranteed, and the service life of the structure is prolonged;

3. the sealing pair formed by the spherical crown and the valve seat adopts a metal-to-metal structure, the hard alloy is welded on the valve seat in an overlaying mode, the spherical crown is made of alloy steel, the corrosion resistance is high, the abrasion resistance is high, the universality of valve parts is strong, the maintenance is convenient, and the service life of the valve is indirectly prolonged;

4. the whole valve adopts a structure of a horizontal shaft design, namely, the valve rod can be horizontally arranged, a vertical structure in the traditional structure is broken through, and the problem of untight closing caused by the sinking of a ball body when the valve operates for a long time is avoided; the valve cover is arranged at the upper end of the valve body, so that the whole structure adopts a top-mounted structure, the middle opening of the valve is designed to be consistent with the structure of the ball body, the ball body can be directly taken out after the valve cover is opened, the assembly, the maintenance and the repair are very easy, time and labor are saved, and the working efficiency is improved; the sectional area of the valve cover is larger than that of the ball body, all parts can be installed from the top of the valve, namely, all parts are installed from one side of the valve cover, the parts do not need to be disassembled from a pipeline in the maintenance process, and once the parts need to be replaced, the bolts on the valve cover only need to be disassembled, the valve cover is taken down, so that the ball body and the spherical crown can be taken out, and the valve can be maintained and maintained on line.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

FIG. 1 is a schematic structural view of the bi-directional pressing eccentric half ball valve of the present invention;

FIG. 2 is a front view of the bi-directional pressing eccentric hemisphere valve of the present invention;

fig. 3 is a cross-sectional view a-a of fig. 2 in accordance with the present invention;

fig. 4 is a cross-sectional view of fig. 3, taken along line C-C, in accordance with the present invention;

figure 5 is a detail view of section E of figure 4 of the present invention;

fig. 6 is a cross-sectional view B-B of fig. 2 in accordance with the present invention;

figure 7 is a detail view of section D of figure 6 of the present invention;

fig. 8 is a schematic structural view of the eccentric half ball valve with two-way pressing at another angle;

figure 9 is a detail view of section F of figure 8 of the present invention;

fig. 10 is a cross-sectional view of the valve seat of the present invention;

fig. 11 is a schematic structural view of the valve seat of the present invention.

Reference numerals:

1. a valve body; 2. a sphere; 21. fastening the gap; 22. a second valve stem; 23. a bottom end cap; 24. connecting sleeves; 25. a first valve stem; 26. shaft sealing; 261. positioning a groove; 27. sealing the cover; 28. a valve pin; 3. a spherical cap; 4. an end cap; 5. a valve cover; 51. a hoisting ring; 6. a valve seat; 61. a dielectric blind hole; 62. a clamping groove.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1-11, the utility model discloses a two-way eccentric hemisphere valve of pressing, including valve body 1, spheroid 2, spherical crown 3, disk seat 6 and end cover 4, the relative valve body 1 of spheroid 2 rotates to be connected, and spherical crown 3 sets firmly on spheroid 2, and disk seat 6 sets firmly on the circulation mouth of one end of valve body 1 through end cover 4, and spheroid 2 is at 1 internal rotation of valve body, has realized opening and the closed action of the full latus rectum of valve body 1 with the valve cooperation, has realized opening and the control of throttle to the pipeline.

The whole valve adopts a structure of a horizontal shaft design, namely, the valve rod can be horizontally arranged, so that a vertical structure in the traditional structure is broken through, and the problem of untight closing caused by the sinking of the ball body 2 when the valve is operated for a long time is solved; the valve cover 5 is arranged at the upper end of the valve body 1, so that the whole structure adopts a top-mounted structure, the middle opening of the valve is designed to be consistent with the structure of the ball body 2, the ball body 2 can be directly taken out after the valve cover 5 is opened, the assembly, the maintenance and the repair are very easy, time and labor are saved, and the working efficiency is improved; the sectional area of the valve cover 5 is larger than that of the ball body 2, so that all parts can be loaded from the top of the valve, namely, from one side of the valve cover 5, in the maintenance process, the parts do not need to be disassembled from a pipeline, and once the parts need to be replaced, the bolts on the valve cover 5 are disassembled, the valve cover 5 is taken down, so that the ball body 2 and the spherical crown 3 can be taken out, and the valve can be maintained and maintained on line.

Preferably, the spherical crown 3 is hemispherical, and the spherical crown 3 is hidden in the cavity of the valve body 1 in the opening state of the valve, so that a sealing surface is prevented from being directly washed by a medium; meanwhile, the full-flow passage circulation of the valve is ensured, the energy loss is reduced to the maximum extent, the head loss is almost zero, and the circulation efficiency is improved; more preferably, a sealing pair formed by the spherical crown 3 and the valve seat 6 adopts a metal-to-metal structure, the valve seat 6 is made of hard alloy by surfacing, the spherical crown 3 adopts alloy steel, the corrosion resistance is high, the wear resistance is high, the universality of valve parts is strong, the maintenance and repair are convenient, and the service life of the valve is indirectly prolonged; in the closing process, the spherical crown 3 on the ball body 2 is gradually close to the valve seat 6, reliable sealing is realized at the closing moment, the sealing pair is prevented from being always in a friction state in the opening and closing process of the valve, and the service life of the valve is prolonged; more preferably, the sealing pair formed between the surface of the spherical cap 3 and the metal valve seat 6 is arranged in an inclined plane, has a shearing effect, and is particularly suitable for fiber-containing materials, solid particles, slurry and the like; more preferably, the spherical crown 3 is fixedly locked on the sphere 2 through a plurality of countersunk screws, the sealing surface of the spherical crown 3 and the valve seat 6 is of a spherical surface structure, the sealing performance is good, and a sealing ring is arranged between the spherical crown 3 and the sphere 2 to ensure the sealing performance between the spherical crown 3 and the sphere 2; more preferably, after the spherical crown 3 is fixedly locked, a fastening gap 21 is arranged between the outer ring end face of the spherical crown 3 and the sphere 2, when the spherical crown 3 is abraded, the spherical crown 3 and the sphere 2 can be further locked, the spherical crown 3 and the sphere 2 are always in a tight and fixedly locked state, the stability is good, the fault is not easy to occur, a certain compensation effect is realized, and the service life of the structure is prolonged.

More preferably, the valve body 1 adopts a semicircular channel, so that the valve has good circulation performance, and the flow channel of the valve body 1 is smooth and has no recess, so that the defects of valve damage, untight closing and the like caused by accumulation of sundries are avoided; when the valve is opened, the flow channel is completely unblocked, and the head loss is small during operation; more preferably, the structure is convenient to operate, can be opened and closed quickly, and can be rotated by 90 degrees from full opening to full closing, so that the structure is convenient for remote control.

Preferably, the valve mounting height is less than the gate valve of the same specification, and is close with the butterfly valve, and structural length is less than ball valve of the same specification, also is close with the butterfly valve, and the installation is not restricted by water flow direction and installation space, can install at any angle, and application scope is wider, is fit for the requirement of all kinds of general trades and uses the valve, such as water, sewage, waste water, steam, gas, paper pulp, metallurgy, ore dressing, electric power, urban heating system, etc. medium.

More preferably, the valve cover 5 is similar to an oval shape, the lifting ring 51 is arranged at the upper end of the valve cover 5 in the long axis direction, the lifting ring 51 is arranged to facilitate taking of the valve cover 5 by an operator in the later maintenance process, the operation convenience is improved, the valve cover 5 is in an upward-protruding arch shape, and the cross-shaped reinforcing rib is arranged at the lower end of the valve cover 5, so that the strength of the whole valve cover 5 is improved; more preferably, one side that valve gap 5 is close to valve body 1 is equipped with the fixed slot, and the embedded sealing strip of establishing of fixed slot, sealing strip adopt market on current sealing strip structure can, do not have special requirement, adopt high temperature resistant materials such as polytetrafluoroethylene, fluororubber to make best, the temperature range of being suitable for is wider a bit, the leakproofness between valve gap 5 and the valve body 1 has been guaranteed in the setting of sealing strip, has guaranteed the leakproofness of whole structure to a certain extent.

In the structure, the number of the valve seats 6 is 1, the valve seats are arranged at the flow opening part at one end of the valve body 1, and the compensation type movable valve seats 6 are adopted, namely the valve seats 6 can do reciprocating motion along the direction of a fluid channel of a hemispherical valve, so that the valve seats 6 can be always attached to the spherical crown 3, bidirectional pressure bearing can be realized, zero leakage sealing can be realized, the working condition that a user needs a double-flow medium pipeline and zero leakage sealing is required can be met, furthermore, in the structure, a sealing surface formed by the spherical crown 3 and the valve seats 6 is provided with a self-cleaning structure, when the sphere 2 inclines away from the valve seat 6, fluid in the pipeline uniformly passes through the sealing surface of the sphere 2 in 360 degrees, the local flushing of the high-speed fluid on the valve seats 6 is eliminated, accumulated objects on the sealing surface are flushed away, and the purpose of self.

More preferably, the valve rod comprises a first valve rod 25 and a second valve rod 22, the ball 2 is in a U-shaped structure, the connecting rods on the two sides of the ball 2 adopt a convex arc structure, the appearance is attractive, the manufacture is convenient, the strength is high, the closed flow area is ensured, as the drift diameter flow is improved, two sides of the ball body 2 are respectively connected with the valve body 1 through the first valve rod 25 and the second valve rod 22 in a rotating way, a composite self-lubricating bearing is arranged between the outer ring of the second valve rod 22 and the valve body 1, the composite self-lubricating bearing is embedded in the valve body 1 and is in interference fit with the valve body 1, the rotation of the second valve rod 22 relative to the valve body 1 is realized, the composite self-lubricating bearing can be directly purchased from the market, as long as the aperture specification is consistent with the specification of the second valve rod 22, the composite self-lubricating bearing can reduce the transmission torque and has obvious advantages in the selection of an electric actuating mechanism; more preferably, the end of the second valve rod 22 passing through is fixed by a bottom end cap 423, the bottom end cap 423 is fixedly locked on the valve body 1 by screws, and a sealing ring is arranged between the bottom end cap 423 and the valve body 1; the first valve rod 25 is connected with an external driving device, the connecting sleeve 24 is arranged between the first valve rod 25 and the ball body 2, one end of the connecting sleeve 24 is positioned by a shoulder structure of the first valve rod 25 in the axial direction, and the other end of the connecting sleeve 24 is positioned by a positioning bulge which extends downwards on the ball body 2, so that the positioning in the axial direction of the connecting sleeve 24 is ensured; the section of the matching section of the first valve rod 25 and the connecting sleeve 24 is of a regular polyhedral structure, so that the transmission of power is ensured, a valve pin 28 for ensuring the relative positions of the sphere 2, the connecting sleeve 24 and the first valve rod 25 is arranged among the sphere 2, the connecting sleeve 24 and the first valve rod 25, a stop groove corresponding to the valve pin 28 is arranged on the connecting sleeve 24, the valve pin 28 penetrates through the sphere 2 and then extends into the stop groove, so that the power is ensured to be transmitted to the sphere 2 from the first valve rod 25, the problem of circumferential rotation or slipping is prevented, and the power transmission efficiency; more preferably, a composite self-lubricating bearing is also arranged between the first valve rod 25 and the valve body 1, and the function of the composite self-lubricating bearing is the same as that of the composite self-lubricating bearing on the second valve rod 22; first valve rod 25 is kept away from and is equipped with bearing seal 26 between spheroid 2's one end and the valve body 1, bearing seal 26's outer lane is equipped with at least one and places the sealing washer and be used for realizing the sealed constant head tank 261 of outer lane, bearing seal 26's inner circle is equipped with at least one and places the sealing washer and be used for realizing the sealed constant head tank 261 of inner circle, first valve rod 25 has been realized the sealed of axis direction, bearing seal 26 has realized the location of axis direction through closing cap 27, closing cap 27 locks admittedly on valve body 1, first valve rod 25 stretches out the part of valve body 1 and is connected with outside drive arrangement through at least one keyway structure, in this application, be equipped with four keyways at the circumference direction equipartition on first valve rod 25, better realization power transmission and.

More preferably, the valve seat 6 is annular, the axis of the valve seat 6 is parallel to the axis of the valve body 1, one end of the valve seat 6 is fixed by the end cover 4 in the axis direction, the other end of the valve seat 6 is fixed by the limit protrusion extending downwards from the valve body 1, the valve seat 6 can slide between the end cover 4 and the limit protrusion in the axis direction, the sliding distance of the valve seat 6 in the axis direction is 3-8mm, preferably 5mm, the sliding distance can ensure the tight fit condition under the wear condition, one side of the valve seat 6 close to the end cover 4 is provided with a plurality of medium blind holes 61, the axis of the medium blind holes 61 is parallel to the axis of the valve seat 6, the plurality of medium blind holes 61 are circumferentially and uniformly distributed relative to the axis of the valve seat 6, when a medium flows from one side of the valve seat 6 to the other side, the medium enters the medium blind holes 61 to promote the valve, the valve seat 6 can be tightly attached to the ball body 2, real-time sealing is realized, and the sealing effect is good; more preferably, the outer ring of the valve seat 6 is provided with at least one clamping groove 62 for placing a sealing ring, and in the structure, the number of the clamping grooves is two, so that the sealing performance of the outer ring of the valve seat 6 is improved.

In the actual working process, the ball body 2 and related parts are installed according to the structure, and are directly put in from the upper end of the valve body 1 when the valve is opened, so that the convenience of assembly is improved, in the later maintenance process, the valve cover 5 is convenient to operate after being opened, the whole structure adopts a horizontal arrangement, the first valve rod 25 and the second valve rod 22 are horizontally arranged, the ball body 2 drives the spherical crown 3 to upwards rotate by 90 degrees from a sealing state to an opening state, the operation is more convenient and faster, in the structure, the valve seat 6 can move in the medium flowing direction, a certain compensation function is realized, the sealing performance of the structure is ensured, the installation and the operation are convenient and faster, and the valve is convenient for later maintenance, and is suitable for various general industries requiring valves, such as water, sewage, waste water, steam, gas, paper pulp, media of metallurgy, mineral separation, electric power, urban heat supply systems and the like.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. Two-way eccentric hemisphere valve of pressure, its characterized in that: the pipeline opening and closing valve comprises a valve body, a ball crown and a valve seat, wherein the ball body is arranged in the valve body and rotates in the valve body, the ball crown is fixedly arranged on the ball body and matched with the valve seat to realize opening and closing control of a pipeline, and the valve seat is arranged at one axial end of the valve body;

2. The bi-directional pressure eccentric hemisphere valve of claim 1, characterized in that: the quantity of medium blind hole is a plurality of and relative the axis direction equipartition of disk seat sets up, the axis of medium blind hole with the axis parallel arrangement of disk seat.

3. The bi-directional pressure eccentric hemisphere valve of claim 1, characterized in that: the sealing pair corresponding to the spherical crown and the valve seat is spherical, a sealing ring for ensuring the sealing of the spherical crown and the ball body is arranged between the spherical crown and the ball body, and a fastening gap for compensation is arranged between the inner side of the outer ring of the spherical crown and the ball body in the state that the spherical crown is fixedly locked.

4. The bi-directional pressure eccentric hemisphere valve of claim 1, characterized in that: the sealing pair formed by the spherical crown and the valve seat adopts a metal-to-metal structure, the valve seat is made of hard alloy in a surfacing mode, and the spherical crown is made of alloy steel.

5. The bi-directional pressure eccentric hemisphere valve of claim 1, characterized in that: the ball body is of a U-shaped structure, two sides of the ball body protrude outwards to form an arc shape, the rotating angle of the ball body is 90 degrees, and the valve body and the part corresponding to the fixed spherical crown and the movement track of the ball body are of a spherical structure.

6. The bi-directional pressure eccentric hemisphere valve of claim 1, characterized in that: one side of the ball body is rotatably connected with the valve body through a first valve rod, the other side of the ball body is rotatably connected with the valve body through a second valve rod, and the part of the first valve rod, which extends out of the valve body, is connected with an external driving device.

7. The bi-directional pressure eccentric half ball valve according to claim 6, wherein: be equipped with the adapter sleeve between first valve rod and the spheroid, in the axis direction of adapter sleeve, one end is fixed a position by the circular bead structure of first valve rod, and the other end is fixed a position by the location arch that downwardly extending set up on the spheroid, and the cooperation section of first valve rod and adapter sleeve is regular polygon shape structure, is equipped with the valve pin of guaranteeing three relative position between spheroid, adapter sleeve and the first valve rod three, is equipped with the locking groove that corresponds with the valve pin on the adapter sleeve, and the valve pin passes and stretches into behind the spheroid and sets up in the locking groove.

8. The bi-directional pressure eccentric half ball valve according to claim 6, wherein: the first valve rod is rotatably connected with the valve body through a self-lubricating bearing, a shaft seal is arranged between one end, far away from the ball body, of the first valve rod and the valve body, the shaft seal is positioned through a sealing cover fixedly locked on the valve body, the second valve rod is rotatably connected with the valve body through the self-lubricating bearing, and one end, far away from the ball body, of the second valve rod is fixed through a bottom end cover.

9. The bi-directional pressure eccentric half ball valve according to claim 8, wherein: the outer lane of bearing seal is equipped with at least one and places the sealing washer and be used for realizing the sealed constant head tank of outer lane, and the inner circle of bearing seal is equipped with at least one and places the sealing washer and be used for realizing the sealed constant head tank of inner circle.

10. The bi-directional pressure eccentric hemisphere valve of claim 1, characterized in that: the valve body is designed to be a horizontal structure, the ball body is horizontally arranged relative to a rotating shaft of the valve body, a valve cover convenient to maintain is arranged at the upper end of the valve body, and the ball body is arranged in the coverage area of the valve cover when the ball body is in an open state.