CN113294577A - Two-way ball valve of cold-drawn integral valve body and preparation method thereof - Google Patents
Two-way ball valve of cold-drawn integral valve body and preparation method thereof Download PDFInfo
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- CN113294577A CN113294577A CN202110791363.1A CN202110791363A CN113294577A CN 113294577 A CN113294577 A CN 113294577A CN 202110791363 A CN202110791363 A CN 202110791363A CN 113294577 A CN113294577 A CN 113294577A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Taps Or Cocks (AREA)
- Valve Housings (AREA)
Abstract
The invention relates to a two-way ball valve of a cold-drawn integral valve body and a preparation method thereof. The valve body of the ball valve is a cold-drawing formed integral valve body, the left side and the right side of the integral valve body are respectively provided with a left connecting pipe and a right connecting pipe, a vertically upward valve rod sleeve or a valve rod sleeve interface extends from the top of the integral valve body, a valve rod sleeve main body which is processed independently is connected to the valve rod sleeve interface, and the valve rod sleeve main body and the valve rod sleeve interface are welded together to form a valve rod sleeve. The preparation method comprises the steps of cold-drawing a top pipe on a straight-through seamless steel pipe by adopting a liquid bulging cold-drawing process, assembling a ball body of a valve and each side valve seat component in a workpiece from a pipe orifice of the workpiece after cold-drawing, positioning each side valve seat component and the ball body by adopting an internal expansion fixture, and respectively compressing left and right pipe sections of the workpiece into left and right connecting pipes of an integral valve body by adopting a cold compression process. The invention reduces or eliminates welding seams on the valve body, reduces the welding difficulty of the welding seams which are not eliminated, and is beneficial to improving the concentricity of the valve seats at two sides.
Description
Technical Field
The invention relates to a two-way ball valve of a cold-drawn integral valve body and a preparation method thereof, which can be used as a large-caliber ball valve and other caliber ball valves in occasions such as a heating system and the like.
Background
The valve body of the large-caliber two-way ball valve used in the existing heating system and other occasions is a welded valve body, the connecting pipes on the left side and the right side and the valve rod sleeve on the top are welded on the corresponding interfaces of the main valve body to form three welding lines, wherein two of the welding lines are vertical circular ring V-shaped welding lines between the connecting pipes on the two sides and the main valve body, and the other welding line is a horizontal intersecting line fillet welding line between the valve rod sleeve and the main valve body. In addition, the process difficulty during assembly welding is high, the concentricity of the sealing surfaces of the valve seats on the two sides is difficult to guarantee, and the opening and closing moment of the ball valve is unstable.
Disclosure of Invention
The invention mainly aims to reduce or eliminate welding seams on a valve body, reduce the welding difficulty of the welding seams which are not eliminated, and further aims to improve the concentricity of valve seats at two sides and improve the stability and consistency of the opening and closing moment of the valve.
The technical scheme for realizing the aim of the invention is as follows:
the two-way ball valve of the cold-drawing integral valve body, in particular to the large-caliber two-way ball valve of the cold-drawing integral valve body, comprises a valve body, wherein the valve body is a cold-drawing formed integral valve body (called valve body for short), the left side and the right side of the integral valve body are respectively provided with a left connecting pipe and a right connecting pipe, a valve rod sleeve or a valve rod sleeve interface which vertically faces upwards is extended out of the top of the integral valve body, a valve rod sleeve main body which is independently processed is connected onto the valve rod sleeve interface, and the valve rod sleeve main body and the valve rod sleeve interface are welded together to form a valve rod sleeve together.
Preferably, the lower end of the valve rod sleeve main body is inserted into the valve rod sleeve opening, the valve rod sleeve main body and the valve rod sleeve opening are welded in an exposed horizontal circular angle mode, and corresponding sealing continuous welding is performed from the outside.
Preferably, a ball serving as an opening and closing member and each side valve seat assembly matched with the ball are arranged in the integral valve body, each valve seat assembly comprises a valve seat support ring and a valve seat mounted on the axially inner side (close to the ball side) of the corresponding valve seat support ring, a sealing surface capable of forming a valve seal with the spherical surface of the ball is arranged on each valve seat, a positioning conical surface attached to the inner surface of the integral valve body is arranged on the radially outer side of each valve seat support ring, and the inner surface of each valve seat attached to the positioning conical surface on each valve seat support ring is in a conical surface shape matched with the positioning conical surface.
Preferably, the taper of the positioning conical surface on the valve seat support ring is 30-60 degrees.
Preferably, an annular disc spring is arranged between the valve seat and the valve seat support ring.
Preferably, the valve seat is provided with a fire collar.
Preferably, the fire collar is L-shaped in cross-section to stop axially outwardly and radially inwardly of the valve seat.
Preferably, a packing for rotary sealing is arranged between the valve rod and the valve rod sleeve.
Preferably, the packing is provided with a packing cover for compacting the packing, and the packing cover can be screwed on the valve stem sleeve or fixed with the valve stem sleeve or the packing box inner shell (if provided) by means of bolt fastening and the like.
Preferably, the top of the valve rod sleeve is provided with a valve rod limiting structure for limiting the rotation range of the valve rod.
Preferably, the valve rod limiting structure is in a notch shape, a limiting pin is arranged on the valve rod, and the outer end of the limiting pin is located in the limiting structure at the top of the valve rod sleeve.
Preferably, the top of the valve stem is connected with a driving device.
The driving device can be any suitable driving device such as a hand wheel or an electric driving device.
The invention discloses a method for preparing a two-way ball valve of a cold-drawing integral valve body, which is characterized in that a two-way ball valve of any cold-drawing integral valve body is adopted, a straight-through seamless steel pipe is used as a workpiece for forming the integral valve body, a pipe jacking used as a valve rod sleeve blank or a valve rod sleeve connector blank is cold-drawn on the workpiece by adopting a liquid bulging cold-drawing process, the pipe jacking is processed into a valve rod sleeve or a valve rod sleeve connector of the integral valve body by adopting a machining mode, a ball body of a valve and pipe openings (pipe openings at any side or two sides) of each side valve seat component of the cold-drawn workpiece are assembled in the workpiece, wherein the ball body is positioned right below the pipe jacking, each side valve seat component is respectively positioned at the left side and the right side of the ball body, an internal expansion clamp is adopted for positioning between each side valve seat component and the ball body, and the left pipe sections and right side pipe sections of the workpiece are respectively compressed into a left side and a left side pipe opening of the integral valve body by adopting a cold compression process, And the positioning conical surfaces of the valve seat supporting rings on each side are respectively attached to the conical inner surfaces of the reducing areas formed by compression molding on the left side and the right side of the workpiece, so that conical positioning between the valve body and the valve seat supporting rings is formed.
The left and right connecting tubes formed by cold compression molding can be machined as required to meet the design requirements of size, construction, precision and the like.
Preferably, before the ball body is installed, each part (generally including the valve rod) of the valve rod assembly which needs to be installed from the inner end of the through hole of the valve rod sleeve is firstly placed into the workpiece from the pipe orifice of the workpiece (from the pipe orifice on either the left side or the right side or from the pipe orifices on both sides respectively) and is installed in place, and then the ball body is placed into the workpiece from the pipe orifice of the workpiece and is installed in place, so that the connection between the ball body and the valve rod is realized.
Preferably, when the valve seat assembly is assembled, the inner expansion fixture is adopted to realize axial positioning of the ball body and the valve seat assembly, and the inner expansion fixture is taken out after cold compression.
Preferably, the internal expansion fixture comprises a mandrel, a main body of the mandrel is cylindrical, external threads for screwing a nut are arranged on the axial outer side of the mandrel, a frustum-shaped expansion part is arranged on the axial inner side of the mandrel, an expansion body and a positioning sleeve are sleeved on the mandrel and screwed with the nut, the expansion body, the positioning sleeve and the nut are sequentially distributed along the axial direction of the mandrel from inside to outside, the expansion body is in a horizontal cup shape, the axis of the expansion body is the same as the axis of the mandrel, the bottom of the cup faces outwards and is provided with an axial through hole sleeved on the mandrel, the cup wall of the expansion body is in a multi-piece design, the inner surface of the expansion body is in a frustum shape (the shape of the side surface of the frustum), and the outer surface of the expansion body is in a cylindrical shape.
Preferably, an annular groove is formed in the radial inner wall of the valve seat support ring, a step-shaped annular notch corresponding to the annular groove in the valve seat support ring is formed in the axial front end of the positioning sleeve, and a plurality of open rings are arranged between the annular groove of the valve seat support ring and the step-shaped annular notch of the positioning sleeve.
The valve seat assembly comprises a valve seat assembly, a ball body, a valve body support ring, a valve seat, a plurality of ring-opening rings, a plurality of valve body support rings and a plurality of disc springs, wherein the valve body support ring is arranged on the valve body support ring, the valve body support ring is connected with the valve seat support ring through a plurality of ring-opening rings, the valve body support ring is connected with the valve body support ring through a plurality of ring-opening rings, the disc springs are arranged on the valve body support ring, and the disc springs are arranged on the valve body support ring.
The invention has the beneficial effects that: because the cold drawing/extrusion mode is adopted to integrally form the integral valve body with the connecting pipes at two sides and the top valve rod sleeve (or the valve rod sleeve opening) by using a single seamless steel pipe, the vertical circular ring V-shaped welding seam between each side connecting pipe and the main valve body in the original valve body is eliminated, the flat intersecting line angle welding seam between the top valve rod sleeve and the main valve body in the original valve is eliminated, even if the valve rod sleeve main body is connected through the valve rod sleeve interface, the welding between the valve rod sleeve main body and the valve rod sleeve opening is changed from the original horizontal intersecting line angle welding to the horizontal circular ring angle welding, the welding difficulty is obviously reduced, thereby obviously reducing the welding quality risk and being beneficial to reducing the manufacturing cost and the maintenance cost; because the conical surface is adopted between the valve seat support ring and the valve body for positioning, the positioning precision is improved, the positioning difficulty is reduced, and the stability of the positioning quality is kept; because the internal expansion fixture (the internal expansion belt clamping mechanism mandrel) is adopted to fix the ball body and each valve seat in the cold compression process of the connecting pipe, the positioning is accurate and firm, the ball body is ensured to have certain sealing specific pressure, and the opening and closing moments of each ball valve are basically the same.
The ball valve of the invention can be used as a large-caliber ball valve of a heating system and can also be used as a ball valve for other purposes.
Drawings
FIG. 1 is a schematic sectional view of the ball valve of the present invention in a front view;
FIG. 2 is a schematic view of a cross-sectional configuration of the ball valve of the present invention in a top view;
FIG. 3 is a schematic sectional view of the inner expanding clamp and its fixing manner of the ball and the valve seat according to the present invention;
fig. 4 is a schematic sectional view of the internal expansion jig according to the present invention.
Detailed Description
Referring to fig. 1-4, the two-way ball valve of the cold-drawing integral valve body comprises an integral valve body 10, the integral valve body comprises a left connecting pipe 11 and a right connecting pipe 12, a vertical valve rod sleeve or a valve rod sleeve interface 15 in a vertical pipe orifice shape is arranged at the top of the integral valve body, a valve rod sleeve main body 14 is inserted into the valve rod sleeve interface, the valve rod sleeve main body and the valve rod sleeve interface are welded together, and because the valve rod sleeve main body and the valve rod sleeve interface are inserted into each other in a tubular structure, a welding line 43 between the valve rod sleeve main body and the valve rod sleeve interface is a horizontal circular fillet welding line, the horizontal intersecting line fillet welding with great difficulty in the prior art is avoided.
The valve rod sleeve opening or the valve rod sleeve on the integrally formed integral valve body is connected with other parts of the valve body through the smooth transition curved surface so as to adapt to the characteristics of a cold drawing process, reduce the process difficulty, help to optimize the internal medium flow structure and reduce the resistance.
Usually, the pipe diameters of the left connecting pipe and the right connecting pipe are the same, and a proper single seamless steel pipe can be selected as a raw material/workpiece for forming the integral valve body according to the size requirements of all parts of the integral valve body and the characteristics of axial compensation and the like involved in a cold drawing process.
The axes of the left connecting pipe and the right connecting pipe are positioned on the same straight line (the left connecting pipe and the right connecting pipe are coaxial), and generally adopt a mirror symmetry (or 180-degree rotation symmetry) structure, and correspondingly, the left valve seat assembly and the right valve seat assembly adopt a coaxial and mirror symmetry structure.
The valve seat assembly mainly comprises a valve seat 32 and a valve seat support ring 31, and in a preferred embodiment, further comprises a disc spring 35 positioned between the valve seat and the valve seat support ring and a fire collar 36 of the valve seat, wherein the fire collar is L-shaped in cross section and shields the axial rear side of the valve seat and the axial outer side part area of the radial inner surface. When a valve seat fire collar is provided, the disc spring is preferably located between the valve seat fire collar and the valve seat support ring. Through the thrust effect of dish spring, help keeping the sealing force between disk seat and the spheroid, and help the rigidity when the ball valve assembly.
Because the integral valve body is of an integrally formed structure, compared with the existing valve body formed by welding the main valve body, the side connecting pipes and the valve rod sleeve, no physical boundary line exists between the main valve body and the side connecting pipes and between the valve rod sleeve and the main valve body (or between the valve rod sleeve and the joint), but for convenience in expression, all parts of the integral valve body are still expressed by terms of the main valve body, the side connecting pipes and the valve rod sleeve.
The integral valve body is internally provided with a ball body 20 serving as an opening and closing part and valve seat assemblies (a left side valve seat assembly and a right side valve seat assembly) 30 on all sides matched with the ball body, each valve seat assembly comprises a valve seat support ring 31 and a valve seat 32 installed on the axial inner side of the corresponding valve seat support ring, a sealing surface capable of forming valve sealing with the spherical surface of the ball body is arranged on each valve seat, and the valve seats can be usually soft valve seats. The radial outer side of the valve seat support ring is provided with a positioning conical surface (conical table surface, namely a curved surface with the shape of the side surface of the conical table) 18 attached to the inner surface of the integral valve body, correspondingly, the inner surface of the valve seat attached to the positioning conical surface of the valve seat support ring is also in a conical surface shape (conical table surface shape) with the same taper, the axis of the positioning conical surface and the axis of the corresponding valve seat are positioned on the same straight line, the straight line is perpendicularly intersected with the axis of the valve rod 41, and the intersection point is the sphere center of the sphere, so that the formed conical surface positioning is beneficial to reducing the positioning process difficulty, improving the positioning precision of the valve seat support ring, further ensuring and improving the coaxiality of the left valve seat and the right valve seat and the concentricity of the sealing surface of each valve seat and the sphere, and ensuring the stability and consistency of the opening and closing torque of the ball valve.
The taper (included angle between a generatrix and an axis in a conical surface) of the surface, which is attached to the inner surface of the integral valve body, of the radial outer side surface of the valve seat support ring is about 45 degrees, for example, 30-60 degrees, and usually has certain axial length (for example, 1/4-1/2 of the radius of a sphere) so as to be beneficial to process implementation and ensure positioning precision and stability, corresponding conical surfaces on the outer side of the valve group support ring are completely attached to corresponding inner parts of the valve body, and the coverage range of the corresponding conical surfaces on the inner wall of the valve body can be generally larger than the actual attachment area after assembly, so that the assembly operation is convenient.
According to actual needs, an O-shaped ring for sealing can be arranged between the positioning conical surface of the valve seat support ring and the corresponding inner surface of the valve body, and an annular groove for embedding the O-shaped ring can be arranged on the positioning conical surface.
The welding mode between the valve rod sleeve main body and the valve rod sleeve opening is horizontal circular ring angle welding, and is sealing continuous welding implemented from the outside.
The two-way ball valve of the cold-drawn integral valve body can be prepared by adopting any one of the preparation methods of the two-way ball valve of the cold-drawn integral valve body disclosed by the invention.
The method for manufacturing the two-way ball valve of the cold-drawn integral valve body can be used for manufacturing any two-way ball valve of the cold-drawn integral valve body, which is disclosed by the invention, by using a straight-through seamless steel pipe as a workpiece, adopting a liquid bulging cold-drawing process (such as a hydraulic bulging process), cold-drawing a push pipe used as a valve rod sleeve blank or a valve rod sleeve connector blank, machining the push pipe into a valve rod sleeve or a valve rod sleeve connector through a machining mode according to design requirements, placing a ball body of a valve and each side valve seat component into the workpiece after cold-drawing, wherein the ball body is positioned in a cavity in the middle of the workpiece, each side valve seat component is respectively positioned at the left side and the right side of the ball body, adopting an internal expansion clamp to position the ball body and positioning the side valve seat components, compressing the left side pipe and the right side pipe in the workpiece into a left connecting pipe and a right connecting pipe through a cold compression process, and machining the left connecting pipe and the right connecting pipe which are formed through cold compression molding according to needs, the positioning conical surface of each valve seat support ring in each valve seat assembly is attached to the inner surface of the conical reducing part (the transition part from the main valve body part to the corresponding pipe orifice) of the left connecting pipe and the right connecting pipe to form conical positioning between the valve body and the valve seat support ring.
The pipe jacking formed by cold drawing can be machined according to design requirements, so that the pipe jacking meets the requirements of a valve rod sleeve or a valve rod sleeve opening, such as dimension machining (for example, grinding off redundant parts) and construction machining (for example, machining the annular step structure and the inner diameter change of the inner wall of the through hole in a turning, milling and other modes, and the specific construction of a chamfer or a thread required by the drawing), and the like.
And under the condition that the jacking pipe is processed into a valve rod sleeve connector, inserting the independently processed valve rod sleeve main body into the valve rod sleeve connector and welding to form a welded valve rod sleeve.
Before the ball is assembled, the components (such as the flat square 42 for connecting with the ball or the valve rod with the flat square, the gasket positioned at the diameter expansion part of the inner end of the through hole, part or all of the sealing relevant components needing to be assembled in the valve body) in the valve rod assembly 40 which needs to be assembled from the inner end of the through hole of the valve rod sleeve can be placed into the workpiece from the pipe orifice at one side of the workpiece and assembled in place, and then the ball is placed into the workpiece from the pipe orifice at one side and assembled in place. The valve rod assembly mainly comprises a valve rod and a part for realizing rotary connection and sealing between the valve rod and a valve rod sleeve, such as a packing 45, a packing box, a packing gland, an O-shaped ring embedded on the valve rod for realizing sealing, a gasket between a flat square at the lower end of the valve rod and the inner end diameter-expanding port of the valve rod sleeve or a valve rod sleeve interface and the like, and the specific design is determined.
The upper end of the valve stem (above the outside of the valve body) may be provided with a drive means such as a handwheel 49.
When the ball is installed, the connection between the ball and the ball connecting structure (such as a flat square structure) at the lower end of the valve body is realized at the same time. Usually, peg graft through "flat square" form grafting/joint structure (can be called flat square usually) between valve rod lower extreme and the spheroid, under this situation, can align the grafting structure at grafting structure and the spheroid top of valve rod lower extreme when inserting the spheroid, the spheroid translation back that targets in place, the flat square "of valve rod lower extreme slides in" the flat square draw-in groove at spheroid top, realizes the joint between the two.
The order of installation of the pieces may be determined according to the size and position of the pieces. Typically, the valve stem and other associated components of the valve stem assembly that are to be installed from the workpiece orifice are installed, the ball is installed, and then the side seat assemblies are assembled by the internal expansion fixture.
When the valve seat assembly is assembled, the inner expansion fixture is adopted to axially position the ball body and the valve seat assembly.
Sealing rings (e.g., O-rings), gaskets, and other attachments or other configurations may be provided as desired.
The necessary machining can be carried out on the relevant parts of the cold-drawn or cold-compressed workpiece (such as cold-compression formed two-side connecting pipes) according to actual needs, and the detailed construction (if any), the dimensional requirements, the surface precision and the like can be completed.
The seal between the valve stem and the valve stem sleeve (or the valve stem sleeve and the valve stem sleeve interface) according to the prior art can be provided with a stuffing box and stuffing to realize rotary seal, and a stuffing gland is arranged on the stuffing to compact the stuffing and keep the stuffing in a proper seal.
Can set up at the top of valve rod cover and be used for spacing breach column structure, set up spacer pin 48 on the valve rod, the outer end of spacer pin extends in breach column structure, through the rotation range of breach column structure restriction spacer pin, and then the rotation range of restriction valve rod.
Referring to fig. 3 and 4, the internal expansion fixture includes a mandrel 61, a main body of the mandrel is cylindrical, an external thread for screwing a nut is arranged on an axial outer side of the mandrel, a frustum-shaped expansion portion 66 is arranged on an axial inner side of the mandrel, an expansion body 65 and a positioning sleeve 63 are sleeved on the mandrel, a nut 62 is screwed on the mandrel, the expansion body, the positioning sleeve and the nut are sequentially distributed along an axial direction of the mandrel from inside to outside, the expansion body is in a horizontal cup shape and can be regarded as including an integrated cup bottom and a cup wall, an axis of the expansion body is the same as an axis of the mandrel, the cup bottom faces outwards, an axial through hole for sleeving the mandrel is arranged on the cup bottom and can slide along the mandrel, an inner surface (a radial inner surface) of the cup wall of the expansion body is in a frustum shape matched with the expansion portion, and can adopt a multi-piece design and can be pushed inwards in the axial direction of the positioning sleeve, with the surface (radial surface) effect of inflation portion, radial outside inflation, the wall of cup surface (radial surface) of inflation body is the cylindricality, extrudees each other with spheroidal through-hole inner wall when the inflation state, realizes and the spheroid between fixed, the position sleeve is the cylindricality that is equipped with axial through-hole, can be under the promotion of nut axial inwards movement to exert the axial inward thrust to the inflation body. When the expansion valve is used, the axial inner end of the expansion part of the mandrel is inserted into the through hole on the corresponding side of the ball body according to the set position requirement, a valve seat in the valve seat assembly on the corresponding side and a part of the valve seat support ring are sleeved on the outer side of the expansion body, when the nut is further screwed, the nut pushes the positioning sleeve to move axially inwards so as to push the expansion body to move axially inwards, the expansion body expands radially outwards under the action of the frustum surface of the expansion part of the mandrel so as to extrude the ball body, the ball body is fixed with the expansion body (and then with the mandrel) through the extrusion action, the mandrel is used for positioning the ball body, the relative position between the valve seat assembly and the ball body is further controlled, and a limiting part capable of limiting the position of the inner end of the mandrel on each side can be arranged in the ball body through an external mechanism and/or arranged in the ball body (for example, the limiting part positioned in the middle of the through hole of the ball body is respectively matched with the end face of the inner end of the mandrel on each side, e.g., a stop at the connecting end of a spherical fit) defines the axial position of each side mandrel (in the axial direction of the respective mandrel).
The internal diameters of the valve seat and the valve seat support ring (the diameter of the axial through hole) are generally the same as (slightly larger than) the diameter of the ball through hole to allow the expansion body on the mandrel to pass through and facilitate positional stability between the pieces. An annular groove 39 (see fig. 1 and 2) may be provided on the radially inner wall of the seat support ring, a stepped annular notch corresponding to the annular groove on the seat support ring is provided at the axially front end of the positioning sleeve, the cup bottom of the expansion body is blocked at the front end of the positioning sleeve to enclose the step-shaped annular gap at the front end of the positioning sleeve into a groove shape, a plurality of open rings (for example, two open rings, three open rings or four open rings) 64 are arranged between the annular groove of the valve seat support ring and the stepped annular notch of the positioning sleeve, when the positioning sleeve axially moves inwards, the valve seat support ring is pushed to axially move inwards through the multi-open ring, thereby realizing the axial spacing of the valve seat support ring relative to the positioning sleeve through the multiple open rings, the axial position of the valve seat support ring (and thus the valve seat assembly including the valve seat) relative to the spindle can then be determined from the axial position of the nut on the spindle. The relative positions of the valve body and the side mandrels are controlled through an external tool and/or a corresponding executing mechanism, the nuts are rotated to the set positions of the mandrels, the positions of the side valve seat assemblies relative to the valve body can be determined, further, the mutual positions of the ball body and the side valve seat assemblies are fixed, the sealing concentricity and the sealing force consistency of the side valve seats are guaranteed, and good sealing of the side sealing pairs in any sealing state and the stability and the consistency of the opening and closing moment of the valve are guaranteed. Because the multi-open ring is adopted for positioning connection between the valve seat supporting seat and the positioning sleeve, the multi-open ring can still be installed and removed under the condition that the inner diameter of the valve seat supporting seat is smaller than the outer diameter of the multi-open ring.
For the connection or matching mode which allows relative movement between two pieces or needs to be installed and matched, the matching clearance between the two pieces can be determined according to the prior art, and the instability caused by overlarge clearance is avoided under the condition of ensuring the movement or the assembly between the two pieces.
Claims (10)
1. The two-way ball valve of the cold-drawing integral valve body, in particular to the large-caliber two-way ball valve of the cold-drawing integral valve body, comprises a valve body and is characterized in that the valve body is a cold-drawing formed integral valve body, a left connecting pipe and a right connecting pipe are respectively arranged at the left side and the right side of the integral valve body, a valve rod sleeve or a valve rod sleeve interface which vertically faces upwards is extended out of the top of the integral valve body, a valve rod sleeve main body which is independently processed is connected to the valve rod sleeve interface, and the valve rod sleeve main body and the valve rod sleeve interface are welded together to form a valve rod sleeve together.
2. A two-way ball valve of a cold drawn integrated valve body according to claim 1, wherein the lower end of the valve stem sleeve body is inserted into the valve stem socket, and the welding manner between the valve stem sleeve body and the valve stem socket is an exposed horizontal circular angle welding.
3. A two-way ball valve for cold drawing of a unitary valve body according to claim 1 or 2, wherein the unitary valve body is provided therein with a ball serving as an opening/closing member and respective side seat assemblies fitted to the ball, the seat assemblies include seat support rings and seats mounted on axially inner sides of the respective seat support rings, the seats are provided with sealing surfaces capable of forming a valve seal with the spherical surface of the ball, radially outer sides of the seat support rings are provided with positioning tapered surfaces fitted to the inner surface of the unitary valve body, and inner surfaces of the seats fitted to the positioning tapered surfaces of the seat support rings have tapered surfaces fitted to the positioning tapered surfaces.
4. A two-way ball valve with a cold drawn unitary valve body as claimed in claim 3, wherein said locating taper on said seat support ring is tapered at 30-60 °.
5. A two-way ball valve with a cold drawn unitary valve body as claimed in claim 3, wherein an annular disc spring is disposed between said valve seat and said seat support ring.
6. A two-way ball valve with a cold drawn unitary valve body as claimed in claim 3, wherein the top of said valve stem is connected to an actuator.
7. A method for preparing a two-way ball valve of a cold-drawing integral valve body is characterized in that a straight-through seamless steel pipe is used as a workpiece for forming the integral valve body, a pipe jacking used as a valve rod sleeve blank or a valve rod sleeve interface blank is cold-drawn on the workpiece by adopting a liquid bulging cold-drawing process, the pipe jacking is processed into a valve rod sleeve or a valve rod sleeve interface of the integral valve body by adopting a machining mode, a ball body of a valve and valve seat assemblies on each side are assembled in the workpiece from pipe orifices of the cold-drawn workpiece, wherein the ball body is positioned right below the pipe jacking, the valve seat assemblies on each side are respectively positioned on the left side and the right side of the ball body, an internal expansion clamp is adopted for positioning between the valve seat assemblies on each side and the ball body, pipe sections on the left side and the right side of the workpiece are respectively used as a left connecting pipe and a right connecting pipe of the integral valve body by adopting a cold compression process, and positioning of a conical surface supporting ring of each conical surface is respectively attached to a conical surface of a tapered area formed by the left side and the right side of the workpiece by compression, forming a conical positioning between the valve body and the valve seat support ring, wherein the two-way ball valve of the cold-drawn integrated valve body is the two-way ball valve of the cold-drawn integrated valve body as claimed in any one of claims 1 to 6.
8. A method of making a two-way ball valve with a cold drawn unitary valve body according to claim 7, wherein the cold compression molded left and right nipples are machined to meet design requirements.
9. A method of manufacturing a two-way ball valve with a cold drawn integral valve body according to claim 7, wherein before the ball body is assembled, each member of the valve stem assembly to be assembled from the inner end of the through hole of the valve stem sleeve is put into the workpiece from the orifice of the workpiece and assembled in place, and then the ball body is put into the workpiece from the orifice of the workpiece and assembled in place, thereby realizing the connection between the ball body and the valve stem.
10. A method of manufacturing a two-way ball valve with a cold drawn unitary valve body according to any of claims 7-9, characterized in that when assembling the seat assembly, the axial positioning of the ball and the seat assembly is achieved by means of an internal expansion fixture, which is removed after cold compression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110791363.1A CN113294577A (en) | 2021-07-13 | 2021-07-13 | Two-way ball valve of cold-drawn integral valve body and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110791363.1A CN113294577A (en) | 2021-07-13 | 2021-07-13 | Two-way ball valve of cold-drawn integral valve body and preparation method thereof |
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| CN113294577A true CN113294577A (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110791363.1A Pending CN113294577A (en) | 2021-07-13 | 2021-07-13 | Two-way ball valve of cold-drawn integral valve body and preparation method thereof |
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| US3819150A (en) * | 1971-08-16 | 1974-06-25 | Saab Scania Ab | Ball plug valve |
| US3919756A (en) * | 1972-08-14 | 1975-11-18 | Saab Scania Ab | Ball plug valve and method of making the same |
| US4545564A (en) * | 1982-09-10 | 1985-10-08 | Krosoczka Joseph D | Valve |
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| KR19980019556A (en) * | 1998-03-27 | 1998-06-05 | 박종성 | A method of manufacturing the ball valve for welding the metal pipe |
| CN1398333A (en) * | 2000-02-03 | 2003-02-19 | 株式会社基茨 | Ball valve and prodn. method therefor |
| WO2014202096A1 (en) * | 2013-06-20 | 2014-12-24 | Broen A/S | Valve and method for making a valve |
| CN112705577A (en) * | 2021-01-26 | 2021-04-27 | 南京坚固高中压阀门制造有限公司 | One-time forming method for valve body and valve pipe of ball valve |
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2021
- 2021-07-13 CN CN202110791363.1A patent/CN113294577A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3819150A (en) * | 1971-08-16 | 1974-06-25 | Saab Scania Ab | Ball plug valve |
| US3919756A (en) * | 1972-08-14 | 1975-11-18 | Saab Scania Ab | Ball plug valve and method of making the same |
| US4545564A (en) * | 1982-09-10 | 1985-10-08 | Krosoczka Joseph D | Valve |
| US4546790A (en) * | 1983-04-07 | 1985-10-15 | Klinger Ag | Fluid valve |
| KR19980019556A (en) * | 1998-03-27 | 1998-06-05 | 박종성 | A method of manufacturing the ball valve for welding the metal pipe |
| CN1398333A (en) * | 2000-02-03 | 2003-02-19 | 株式会社基茨 | Ball valve and prodn. method therefor |
| WO2014202096A1 (en) * | 2013-06-20 | 2014-12-24 | Broen A/S | Valve and method for making a valve |
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Address after: No. 2 Yuwei 12th Road, Yufa Town, Daxing District, Beijing 102602 Applicant after: Beijing Beigao Valve Group Co.,Ltd. Address before: 102650 No. 2, Yuwei 12th Road, Yulong Town, Daxing District, Beijing Applicant before: BEIJING BEIGAO VALVE Co.,Ltd. |