CN218863313U

CN218863313U - Floating ball valve

Info

Publication number: CN218863313U
Application number: CN202223128396.7U
Authority: CN
Inventors: 黄�俊
Original assignee: KAITAI VALVE GROUP
Current assignee: KAITAI VALVE GROUP
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-04-14
Anticipated expiration: 2032-11-24

Abstract

The utility model discloses a ball valve floats, include: valve body, locate the rotatable spheroid that is used for the control valve body switching in the valve body, be connected and run through the valve body and extend to the outer valve rod of valve body with the spheroid, wherein: the valve body is provided with a stuffing box, the valve rod penetrates through the stuffing box of the valve body and extends out of the valve body, and stuffing is arranged between the valve rod and the inner wall of the stuffing box; the stuffing box is provided with a first gland and a second gland, at least one part of the first gland is arranged in the stuffing box, the lower end of the first gland is abutted to the stuffing, the upper end of the first gland is abutted to the lower surface of the second gland, the upper end of the first gland is provided with a first cambered surface, the lower surface of the second gland is provided with a second cambered surface, and the first cambered surface is abutted to the second cambered surface. The utility model discloses a setting of first gland and second gland ensures that the second gland can be coaxial all the time with the valve rod, and compress tightly perpendicularly all the time with the packing surface.

Description

Floating ball valve

Technical Field

The utility model relates to a technical field of ball valve especially relates to a ball valve floats.

Background

In recent years, the application of the cast steel floating ball valve is rapidly developed in the industrial fields of petroleum, petrochemical industry, natural gas and the like at home and abroad; most of the present enterprises use ball valves technology standard directly to adopt the foreign advanced design standard, such as API6D pipeline valve, API608 flange and butt welded end metal ball valve, ISO17292 oil, petrochemical and related industrial metal ball valve and other valve standards. The harsh working conditions of petroleum and petrochemical industry and the strict technical specifications of enterprises have higher and higher requirements on the quality of the ball valve, and the main indexes of the ball valve, such as the sealing performance of a valve seat, the sealing performance of a valve rod, the opening and closing torque of the valve and the like, are stricter and stricter. Meanwhile, due to the application of an intelligent system, remote valve control is popularized, a plurality of manual floating ball valves may need to be changed into electric operation or pneumatic operation in actual use, the designed valve top needs to be designed according to ISO5211 connection size, the valve can be directly and mutually converted between manual operation and mechanical operation according to requirements of customers in use, and the structure is analyzed and designed. The floating ball valve operated mechanically has high sealing requirement on the valve rod part, the structure of the stuffing box needs to be changed emphatically on the upper connecting part, the stuffing pressing sleeve is designed in a split mode, and common valve rod leakage reasons of the pipeline ball valve are analyzed. Therefore, the floating ball valve is comprehensively introduced from four angles of structure, principle, maintenance and design, and is expected to play a greater role in practical application.

The ball of the ball valve is floating, and the structure without the fixed shaft is called a floating ball valve. The sealing principle is that under the action of medium pressure, the ball body generates certain displacement and is tightly pressed on the sealing surface of the outlet end, so that the outlet end is sealed. The floating ball valve is simple in structure and good in sealing performance, but the load of the ball bearing working media is completely transmitted to the outlet sealing ring, so whether the sealing ring material can bear the working load of the ball media is considered, and the ball can possibly shift when being impacted by high pressure. Floating ball valves are typically used for medium and low pressure conduits.

The ball valve has the main characteristics of compact structure, reliable sealing, simple structure, convenient maintenance, closed sealing surface and spherical surface, difficult erosion by media, easy operation and maintenance, suitability for common working media such as water, solvent, acid, natural gas and the like, suitability for media with severe working conditions such as oxygen, hydrogen peroxide, methane, ethylene and the like, and wide application in various industries. Referring to fig. 1 and 2, the ball valve body may be integral or combined.

The floating ball valve has the following characteristics:

1. in various valves, the flow resistance of the ball valve is the smallest, when the full-diameter ball valve is opened, the ball channel, the valve body channel and the connecting pipe are equal in diameter and have a diameter, and the medium can flow through the ball valve almost without loss.

2. The ball valve can be fully closed and fully opened by rotating 90 degrees, and the opening and the closing are rapid. Compared with gate valves and stop valves of the same specification, the ball valve has small volume, light weight and convenient pipeline installation.

3. Advanced valve seat materials are designed by accumulating the manufacturing experience of ball valves for many years, the valve is ensured to be sealed, the friction coefficient is low, the operating torque is small, the valve seat materials are various, and the application range is wide.

4. The handle without error is connected with the handle by adopting a flat-head valve rod, so that the dislocation is avoided, and the on-off state indicated by the handle is ensured to be consistent with the position of a valve ball channel.

5. The locking device is used for preventing the valve from being opened and closed by mistake, and locking holes are arranged at the full-opening and full-closing positions of the valve to ensure that the valve is positioned at the correct position.

6. The valve rod is of a lower installation type, so that the valve rod is prevented from flying out under pressure, and meanwhile, the valve rod can form metal contact with a valve body after a fire disaster, so that the sealing of the valve rod is ensured.

7. The ball valve uses a ball body with a circular through hole as an opening and closing part, and the ball body rotates by 0-90 degrees around the center of a valve rod under the driving of the valve rod to complete the opening and closing functions; the valve has the characteristics of compact structure and quick opening and closing, and can be closed and the pipeline medium can be cut off by rotating 90 degrees; the diameter of the spherical channel is the same as that of the pipeline, so that the flow resistance is small and the circulation capacity is high; the valve rod is of a lower-mounting type, so that the accident that the valve rod penetrates out is avoided, and the use safety is ensured.

Most of various floating ball valves produced on the market are integrated, and comprise a plate-shaped structure part which is arranged outside a valve body and fixedly connected with the valve body and a cylindrical structure part which is arranged in a stuffing box of the valve body and used for compacting stuffing, wherein the plate-shaped structure part and the cylindrical structure part are integrally connected, namely, the inclination of the plate-shaped structure part drives the inclination of the cylindrical structure part, and the plate-shaped structure part and the cylindrical structure part share the axis. The valve of equipment like this appears the installation skew because installer's operation reason easily, and when leading to the switching valve, the packing atress is inhomogeneous, appears leaking the phenomenon, and the valve rod receives the extrusion of the gland of integral type moreover, and is impaired, because the valve rod receives the extrusion to lead to the switching torque to be on the large side, and valve life subtracts the weak point.

SUMMERY OF THE UTILITY MODEL

In view of this, the extruded problem of gland is received to packing atress inequality, the valve rod that arouses in order to solve the skew that probably exists that the gland of integral type leads to, the utility model aims to provide a floating ball valve divide into split type two parts with the gland structure, and adopts the cambered surface contact between the two parts to avoid its extrusion valve rod, and reduced the operating torque of valve.

In order to realize the purpose, the utility model discloses the technical scheme who takes does:

a floating ball valve, comprising: the valve body, locate rotatable being used for in the valve body control the spheroid of valve body switching, with the spheroid is connected and runs through the valve body and extend to the valve rod outside the valve body, wherein:

the valve body is provided with a stuffing box, the valve rod penetrates through the stuffing box of the valve body and extends out of the valve body, and stuffing is arranged between the valve rod and the inner wall of the stuffing box;

the packing gland comprises a packing box and is characterized in that a first pressing cover and a second pressing cover are arranged at the position of the packing box, at least one part of the first pressing cover is arranged inside the packing box, the lower end of the first pressing cover abuts against the packing, the upper end of the first pressing cover abuts against the lower surface of the second pressing cover, the upper end of the first pressing cover is provided with a first cambered surface, the lower surface of the second pressing cover is provided with a second cambered surface, and the first cambered surface abuts against the second cambered surface.

In the above floating ball valve, the first gland has a cylindrical structure extending along the axial direction of the valve rod, and a first through hole for the valve rod to pass through is formed in the middle of the first gland;

the second gland is of a plate-shaped structure, and a second through hole for the valve rod to pass through is formed in the middle of the second gland.

In the above floating ball valve, a fitting groove is formed in the lower surface of the second gland, the upper end of the first gland is arranged in the fitting groove, and at least a part of the bottom surface of the fitting groove has the second arc surface.

The above floating ball valve, wherein the valve body comprises a first tubular structure arranged along a first direction and a second tubular structure arranged along a second direction, the first tubular structure and the second tubular structure are communicated, and the ball body is arranged at the joint of the first tubular structure and the second tubular structure;

the packing box is formed inside the second tubular structure, a part of the valve rod is arranged in the second tubular structure, an annular accommodating space is formed between the valve rod and the packing box, and the packing is arranged in the annular accommodating space.

In the floating ball valve, the upper end of the second tubular structure extends in the radial direction to form a flange, and the outer edge of the lower surface of the second gland abuts against the flange.

In the floating ball valve, the inner side of the flange extends upwards to form an annular flange bulge;

the matching groove of the second gland is a two-stage step groove, and comprises a first part and a second part, wherein the first part is positioned in the middle of the matching groove and has a larger groove depth, and the second part surrounds the first part and has a smaller groove depth;

the bottom surface of the first part forms the second cambered surface;

the flange bulge is arranged in the second part, and preferably, the bottom surface of the second part is abutted against the upper end of the flange bulge.

In the floating ball valve, a teflon lining is arranged between the first gland and the valve rod.

In the floating ball valve, the sealing rings are arranged between the first gland and the valve rod and between the first gland and the valve body.

The above-mentioned floating ball valve, wherein a gap is provided between the inner wall of the second through hole and the outer wall of the valve rod.

In the floating ball valve, the first arc surface is a convex arc surface, and the second arc surface is a concave arc surface; the first cambered surface and the second cambered surface are both spherical surfaces.

The utility model discloses owing to adopted above-mentioned technique, make it compare the positive effect that has with prior art and be:

(1) The utility model discloses a setting of first gland and second gland ensures that the second gland can be coaxial all the time with the valve rod, and compress tightly perpendicularly all the time with the packing surface.

(2) The utility model discloses owing to set up the cambered surface contact, screw up and just can not appear pressing the skew card of cover and valve rod and hinder the phenomenon, avoided the manual installation to appear the rotatory problem of hindering of valve rod, influence valve life.

(3) The utility model discloses set up the bush in the inside of first gland, avoided the scotch and the wearing and tearing of valve rod and packing pressure cover to the operating torque of valve has been reduced.

(4) The utility model discloses all set up the sealing washer in the inboard and the outside of first gland, increased the secondary seal, ensure the reliability of valve rod position seal.

Drawings

FIG. 1 is a schematic view of one of the prior art floating ball valves of the present invention;

FIG. 2 is a schematic view of another prior art floating ball valve of the present invention;

FIG. 3 is a schematic cross-sectional view of the floating ball valve of the present invention;

FIG. 4 is a schematic cross-sectional view of the floating ball valve of the present invention; a schematic side view direction diagram;

fig. 5 is a partially enlarged schematic view of the floating ball valve of the present invention;

in the drawings: A. a filler cover; B. a filler cover; 1. a valve body; 11. a first tubular structure; 12. a second tubular structure; 121. flanging; 122. the flanging is convex; 2. a sphere; 3. a valve stem; 4. a first gland; 5. a second gland; 51. a mating groove; 511. a first portion; 512. a second portion; 6. a filler; 7. a polytetrafluoroethylene liner; 8. and (5) sealing rings.

Detailed Description

The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "horizontal", "vertical", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or original document indicated must have a specific position, and therefore, should not be construed as limiting the present invention.

The horizontal direction in the utility model is the horizontal direction in fig. 3, and the vertical direction is the vertical direction in fig. 3. The horizontal direction and the vertical direction in the utility model refer to the direction which is roughly horizontal or roughly vertical, and are not strict horizontal planes or vertical planes. In fact, it is also acceptable to have some error in the directions referred to by the horizontal and vertical directions.

Referring to fig. 3 to 5, there is shown a floating ball valve of a preferred embodiment, including: the valve comprises a valve body 1, a rotatable ball body 2 arranged in the valve body 1 and used for controlling the valve body 1 to open and close, and a valve rod 3 connected with the ball body 2, penetrating through the valve body 1 and extending out of the valve body 1, wherein the valve body 1 is provided with a stuffing box, the valve rod 3 penetrates through the stuffing box of the valve body 1 and extends out of the valve body 1, and stuffing 6 is arranged between the valve rod 3 and the inner wall of the stuffing box; wherein, the stuffing box department is equipped with first gland 4 and second gland 5, and the inside of stuffing box is located to at least partly of first gland 4, and the lower extreme of first gland 4 supports in packing 6, and the upper end of first gland 4 supports in the lower surface of second gland 5, and the upper end of first gland 4 has first cambered surface, and the lower surface of second gland 5 has the second cambered surface, and the first cambered surface of first gland 4 supports in the second cambered surface of second gland 5.

The first and second cambered surfaces allow the axis between the first gland 4 and the second gland 5 to be in a misaligned state, and more specifically, the axis of the second gland 5 may be offset at an angle with respect to the axis of the first gland 4.

That is, the second gland 5 is installed at a certain inclination angle during the rotation, which does not affect the rotation of the valve stem 3. More specifically, the split structure of the first gland 4 and the second gland 5 allows for cambered or even spherical contact between the second gland 5 and the first gland 4, forming a gimbal-like structure, thereby further allowing the second gland 5 to be able to transmit pressure to the first gland 4 at any angle.

Furthermore, since there is no need to limit the angle of the second gland 5, the first gland 4 can be better fitted to the outer wall of the valve stem in any case, and is in a state of being perpendicular to the packing 6, compacting the packing 6.

Further, as a preferred embodiment, the first gland 4 is a cylindrical structure extending along the axial direction of the valve rod 3, and the middle part of the first gland 4 is provided with a first through hole for the valve rod 3 to pass through.

Further, as a preferred embodiment, the second gland 5 is a plate-shaped structure, and the middle part of the second gland 5 has a second through hole for passing the valve rod 3.

Further, as a preferred embodiment, the lower surface of the second pressing cover 5 is provided with a matching groove 51, the upper end of the first pressing cover 4 is arranged in the matching groove 51, and at least a part of the bottom surface of the matching groove 51 is provided with a second cambered surface.

Further, in other embodiments not shown in the present invention, the bottom surface of the fitting groove 51 may be a complete second arc surface. In the embodiment described below, the fitting groove 51 may also be divided into two portions.

Further, as a preferred embodiment, the valve body 1 comprises a first tubular structure 11 arranged along a first direction, preferably a horizontal direction in fig. 3, and a second tubular structure 11 arranged along a second direction, preferably a vertical direction in fig. 3, wherein the first tubular structure 11 and the second tubular structure 12 are communicated, and the joint of the first tubular structure 11 and the second tubular structure 12 is provided with the ball 2.

Preferably, the first direction and the second direction are perpendicular. In other embodiments, the first direction and the second direction may be arranged to have an included angle therebetween.

Preferably, the first tubular structure 11 is intended for the passage of a fluid and the second tubular structure 12 is intended for the arrangement of the valve stem 3.

Preferably, the valve body 1 can adopt a left-right split structure.

Further, as a preferred embodiment, the second tubular structure 12 is internally formed with a stuffing box, a part of the valve stem 3 is disposed in the second tubular structure 12, an annular accommodating space is formed between the valve stem 3 and the stuffing box, and the stuffing 6 is disposed in the annular accommodating space.

Further, as a preferred embodiment, the upper end of the second tubular structure 12 extends in the radial direction to form a flange 121, and the outer edge of the lower surface of the second gland 5 abuts against the flange 121.

Further, as a preferred embodiment, the inner side of the flange 121 extends upward to form an annular flange protrusion 122.

Further, as a preferred embodiment, the matching groove 51 of the second gland 5 is a two-step groove, and the matching groove 51 of the second gland 5 includes a first portion 511 with a larger groove depth in the middle and a second portion 512 with a smaller groove depth surrounding the first portion 511.

Further, as a preferred embodiment, the bottom surface of the first portion 511 forms a second arc surface.

Further, as a preferred embodiment, the flange protrusion 122 is disposed in the second portion 512, and preferably, the bottom surface of the second portion 512 abuts against the upper end of the flange protrusion 122. The burring boss 122 has a positioning function.

Further, as a preferred embodiment, a teflon bush 7 is disposed between the first gland 4 and the valve stem 3.

Further, as a preferred embodiment, sealing rings 8 are disposed between the first gland 4 and the valve rod 3, and between the first gland 4 and the valve body 1. The sealing ring is preferably an O-ring. The sealing ring provides a second seal in addition to the packing 6.

Further, as a preferred embodiment, there is a gap between the inner wall of the second through hole of the second gland 5 and the outer wall of the valve stem 3.

Further, as a preferred embodiment, the first arc surface is a convex arc surface, and the second arc surface is a concave arc surface.

Further, as a preferred embodiment, the first cambered surface and the second cambered surface are both spherical surfaces.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope and embodiments of the present invention, and it should be appreciated by those skilled in the art that various equivalent and obvious modifications can be made in the present invention and the description and drawings, and all such modifications are intended to be included within the scope and spirit of the present invention.

Claims

1. A floating ball valve, comprising: valve body, locate rotatable being used for in the valve body control the spheroid of valve body switching, with the spheroid is connected and runs through the valve body and extend to the valve rod outside the valve body, its characterized in that:

the stuffing box is characterized in that a first gland and a second gland are arranged at the stuffing box, at least one part of the first gland is arranged in the stuffing box, the lower end of the first gland abuts against the stuffing, the upper end of the first gland abuts against the lower surface of the second gland, the upper end of the first gland is provided with a first cambered surface, the lower surface of the second gland is provided with a second cambered surface, and the first cambered surface abuts against the second cambered surface.

2. The floating ball valve according to claim 1, wherein the first gland is a cylindrical structure extending in an axial direction of the valve stem, and a middle portion of the first gland has a first through hole through which the valve stem passes;

3. The floating ball valve according to claim 1 or 2, wherein a fitting groove is formed in a lower surface of the second gland, an upper end of the first gland is disposed in the fitting groove, and at least a part of a bottom surface of the fitting groove has the second arc surface.

4. The floating ball valve of claim 3, wherein said valve body includes a first tubular structure disposed in a first direction and a second tubular structure disposed in a second direction, said first and second tubular structures being in communication, the junction of said first and second tubular structures providing said ball;

5. The floating ball valve of claim 4, wherein the upper end of the second tubular structure extends in a radial direction to form a flange, and the outer edge of the lower surface of the second gland abuts against the flange.

6. The floating ball valve according to claim 5, wherein the inner side of the flange extends upwards to form an annular flange bulge;

the bottom surface of the first part forms the second cambered surface;

the flange projection is disposed in the second portion.

7. The floating ball valve of claim 1, wherein a bushing is disposed between the first gland and the valve stem.

8. The floating ball valve of claim 1, wherein a sealing ring is disposed between the first gland and the valve stem and between the first gland and the valve body.

9. The floating ball valve of claim 2, wherein there is a gap between an inner wall of the second through bore and an outer wall of the valve stem.

10. The floating ball valve of claim 1, wherein the first arcuate surface is a convex arcuate surface and the second arcuate surface is a concave arcuate surface; the first cambered surface and the second cambered surface are both spherical surfaces.