阅读说明：本技术 一种两段式低温锻钢浮动球阀 (Two-section type low-temperature forged steel floating ball valve ) 是由 师晓东 韩冬傲 杨海峰 刘辉 徐艳华 胡海超 彭冰冰 于 2021-09-29 设计创作，主要内容包括：一种两段式低温锻钢浮动球阀,包括阀体、球体、上阀盖、阀杆、填料函、阀座,阀体的外圆中心线与通道的中心线有偏心距,阀座上游端的密封圈与阀座间设有碟簧、弹簧垫,密封圈外圆设有排气孔,密封圈的反面为斜面,正面为球面,填料函的底部设有轴承,上阀盖上设有安装限位杆的螺纹孔,阀杆与手柄座之间设有限位板。本发明的有益效果是,在低温工况下弹簧力和介质力共同提供阀门密封的必须比压,提高了阀门密封性能,降低了启闭扭矩,避免了开关过程中定位板对压板螺栓产生的横向冲击载荷。(The utility model provides a two segmentation low temperature forged steel ball valve that floats, includes valve body, spheroid, upper valve gap, valve rod, packing box, disk seat, and there is the eccentricity between the excircle central line of valve body and the central line of passageway, is equipped with dish spring, spring packing between the sealing washer of disk seat upstream end and disk seat, and the sealing washer excircle is equipped with the exhaust hole, and the reverse side of sealing washer is the inclined plane, and the front is the sphere, and the bottom of packing box is equipped with the bearing, is equipped with the screw hole of installation gag lever post on the upper valve gap, is equipped with the limiting plate between valve rod and the handle seat. The invention has the advantages that the spring force and the medium force jointly provide the necessary specific pressure for sealing the valve under the low-temperature working condition, the sealing performance of the valve is improved, the opening and closing torque is reduced, and the transverse impact load of the positioning plate on the pressure plate bolt in the opening and closing process is avoided.)

1. The utility model provides a two segmentation low temperature forged steel ball valve that floats, includes valve body, spheroid, goes up valve gap, valve rod, packing box, disk seat, its characterized in that, the excircle central line of valve body has the eccentricity with the central line of passageway, be equipped with dish spring, spring pad between the sealing washer of disk seat upper end and disk seat, the sealing washer excircle is equipped with the exhaust hole, the reverse side of sealing washer is the inclined plane, openly is the sphere, the bottom of packing box is equipped with the bearing, go up the screw hole that is equipped with the installation gag lever post on the valve gap, be equipped with the limiting plate between valve rod and the handle seat.

2. The two-stage low temperature forged steel floating ball valve according to claim 1, wherein said ball body is provided with a pressure relief hole.

3. The two-stage floating ball valve made of low temperature forged steel according to claim 2, wherein the lower end of the valve stem is provided with a blind hole for mounting the spring and the steel ball.

4. A two-stage floating ball valve made of low temperature forged steel according to claim 3, wherein the number of said disc spring and said spring washer is not less than 2.

5. The two-stage low temperature forged steel floating ball valve according to claim 4, wherein said exhaust holes are uniformly distributed semicircular exhaust holes.

Technical Field

The invention relates to a low-temperature ball valve, in particular to a two-section type low-temperature forged steel floating ball valve.

Background

The existing two-section type low-temperature floating ball valve in the market has the phenomenon of standard exceeding leakage under the low-temperature working condition, and the reason is that most of the structure of the ball valve is designed according to the structure of the traditional floating ball valve, and the design of pertinence to the ball valve under the low-temperature severe working condition is not considered. The traditional structure is used for when ordinary operating mode is in the closed position, produce initial sealed specific pressure through the thrust that the upper reaches medium provided to spheroid and sealing washer according to the principle of floating ball valve, this structure can satisfy basic valve sealing performance requirement, but because parts such as the spheroid of floating ball valve, valve body are the metalwork, and the sealing washer is the non-metalwork very often, the linear expansion coefficient of both has very big difference, so under low temperature operating mode, can appear fit clearance between sealing washer and spheroid and valve body because of the difference of shrinkage factor, only rely on medium thrust to be unable its sealing performance of guaranteeing when the spheroid is closed.

Meanwhile, the handle limiting mode is limited by a traditional pressing plate bolt, the inner hexagon screw of the packing pressing plate is a pressure-bearing member, the sealing force of packing is directly borne, meanwhile, the inner hexagon screw disc can be subjected to impact load at the end part of the positioning plate, the screw of the pressing plate can be loosened when the valve is repeatedly opened and closed for a long time, and the risk that the pressure boundary fails due to fatigue shear stress exists.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a two-section type low-temperature forged steel floating ball valve.

The technical scheme includes that the two-section type low-temperature forged steel floating ball valve comprises a valve body, a ball body, an upper valve cover, a valve rod, a packing box and a valve seat, wherein the center line of the excircle of the valve body and the center line of a channel have an eccentric distance, a disc spring and a spring pad are arranged between a sealing ring at the upstream end of the valve seat and the valve seat, an exhaust hole is formed in the excircle of the sealing ring, the reverse side of the sealing ring is an inclined plane, the front side of the sealing ring is a spherical surface, a bearing is arranged at the bottom of the packing box, a threaded hole for installing a limiting rod is formed in the upper valve cover, and a limiting plate is arranged between the valve rod and a handle seat.

Preferably, the ball body is provided with a pressure relief hole.

Preferably, the lower end of the valve rod is provided with a blind hole for mounting the spring and the steel ball.

Preferably, the number of the disc springs and the number of the spring pads are not less than 2 respectively.

Preferably, the exhaust holes are uniformly distributed semicircular exhaust holes.

The invention has the advantages that the pretightening force provided by the disc spring and the spring cushion between the sealing ring at the upstream end of the valve seat and the valve seat provides the necessary specific pressure for sealing the valve under the low-temperature working condition by the spring force and the medium force, thereby improving the sealing performance of the valve; the bearing is arranged at the bottom of the stuffing box, so that opening and closing torque is reduced, and torsional rigidity of the valve shaft is improved; the lower end of the valve rod is provided with a blind hole for mounting a spring and a steel ball, so that safety accidents caused by electrostatic sparks are prevented; the valve body is designed eccentrically, so that the valve body is designed to be light, the opening and closing torque is further reduced, and the material cost is saved; the upper valve cover is provided with a threaded hole for installing the limiting rod, and the limiting plate is arranged between the valve rod and the handle seat, so that the transverse impact load generated by the positioning plate on the pressing plate bolt in the opening and closing process is avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a schematic view of a seal ring structure;

FIG. 4 is a schematic view of the valve body construction;

fig. 5 is a partially enlarged view of a portion B in fig. 1.

In the figure: 1. a valve body; 2. a sphere; 3. an upper valve cover; 4. a valve stem; 5. a stuffing box; 6. a seal ring; 601. a bevel; 602. spherical surface; 603. an exhaust hole; 7. a disc spring; 8. a spring pad; 9. a valve seat; 10. a bearing; 11. a limiting rod; 12. a handle seat; 13. a limiting plate; 14. a pressure relief vent; 15. the center line of the excircle of the valve body; 16. a channel centerline; 17. a spring; 18. a steel ball; x. eccentricity.

Detailed Description

As shown in the figure, a two segmentation low temperature forged steel ball valve that floats, including valve body 1, spheroid 2, go up valve gap 3, valve rod 4, packing box 5, disk seat 9, there is the eccentricity X at excircle central line 15 and the passageway central line 16 of valve body 1, make valve body 1 design lightweight, the open-close moment of torsion has been reduced, be equipped with pressure release hole 14 on the spheroid 2, be equipped with respectively no less than two dish spring 7 between sealing washer 6 and the disk seat 9 of disk seat 9 upper reaches end, spring pad 8, dish spring 7, the pretightning force that spring pad 8 provided, spring force and medium power provide valve seal's must specific pressure jointly under the low temperature operating mode, valve sealing performance has been improved. The excircle of the sealing ring 6 is provided with semicircular exhaust holes 603 which are uniformly distributed, so that the sealing ring 6 can be conveniently installed in the valve body 1, the reverse side of the sealing ring 6 is an inclined plane 601, the front side of the sealing ring 6 is a spherical surface 602, and the spherical surface 602 of the inclined plane 601 can ensure that the sealing ring 6 stores certain elastic potential energy after being tightly attached to the ball body 2, thereby reducing the fit clearance generated by low-temperature shrinkage. The bottom of the stuffing box 5 is provided with a bearing 10, so that the opening and closing torque is reduced, and the torsional rigidity of the valve rod 4 is improved. The upper valve cover 3 is provided with a threaded hole for installing the limiting rod 11, and the limiting plate 13 is arranged between the valve rod 4 and the handle seat 12, so that the transverse impact load generated by the limiting plate 13 on the pressing plate bolt in the opening and closing process is avoided, and the sealing reliability of the stuffing box 5 is ensured. The lower end of the valve rod 4 is provided with a blind hole for installing a spring 17 and a steel ball 18, so that safety accidents caused by electrostatic sparks are prevented.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.