CN220956904U

CN220956904U - Metal seal ball valve with reinforced ball body and combined valve seat

Info

Publication number: CN220956904U
Application number: CN202321788526.1U
Authority: CN
Inventors: 周健; 廖宁波; 赵明敏; 王尊礼; 刘润田; 徐文兵; 戴学祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2024-05-14
Anticipated expiration: 2033-07-07

Abstract

The utility model provides a metal seal ball valve of reinforcing spheroid and combination disk seat, a serial communication port, including being equipped with the combination disk seat and disk seat gland (7) of multiple alternative scheme's reinforcing spheroid and multiple alternative scheme, left side body (1), right side body (3), the valve casing of constituteing by connecting bolt (15) fastening, reinforcing spheroid, including 1 st spheroid (2) and 2 nd spheroid (29), the combination disk seat, including 1 st combination disk seat (9), 2 nd combination disk seat (10), 3 rd combination disk seat (11), 4 th combination disk seat (12), 5 th combination disk seat (13) and 6 th combination disk seat (14), left side body (1), right side body (3), the setting of left side body (1) step groove (1 a, 1 b) has the characteristic for mirror orientation with right side body (3), disk seat gland (7 a) is arranged in hole (1 c) of left side body (1), conical surface (7 b) selectively contacts with the conical surface on a combination disk seat, this setting has the characteristic for mirror orientation in right side body (3).

Description

Metal seal ball valve with reinforced ball body and combined valve seat

Technical Field

The invention discloses a steel metal sealing high-temperature ball valve for reinforcing a ball and a combined valve seat on petroleum, chemical and related industrial pipeline equipment.

Background

The ball valve is mainly used for cutting off, distributing and changing the flow direction of the medium in the pipeline, and has the advantages of simple structure, small volume, light weight and convenient maintenance; the fluid resistance is small, the tightness is reliable, and the sealing performance is good; the operation is convenient, the opening and the closing are rapid, and the remote control is convenient; the sealing surfaces of the ball body and the valve seat are isolated from the medium, so that the erosion of the sealing surface of the valve is not easy to cause; the application range is wide, the diameter is from small to a few millimeters, and from large to a few meters, and the method can be applied from high vacuum to high pressure. Ball valves generally employ soft sealing rings, the service temperature of which is limited by the material of the sealing ring. Therefore, the ball valve has a disadvantage in that the range of use temperature is small.

The steel metal sealing ball valve is used for conveying liquid and other mixed liquid-solid multiphase medium cutting devices, such as dust and the like, on the related industrial pipeline equipment devices of petrochemical industry and the like, wherein the opening and closing part is a sphere with a right circular section channel which is arranged in a shell of the ball valve, the sphere can be opened and closed to cut off the medium by rotating 90 degrees along with the axis of the valve rod channel, and the valve can realize quick opening and closing, has the same flow passage area after full opening as a pipeline, has consistent flow resistance, has obvious energy saving and consumption reduction effects, can be applied to high-temperature and high-pressure environments (such as less than or equal to 25MPa and more than or equal to 425 ℃), is the universal valve which has the fastest development degree in the prior art and can be widely applied.

Chinese United kingdom

GB/T21385

GB/T26147

API 6D

API 608

MSS SP 72

BS 5351

CN 202531897U

Technological development and progress of ball valves are mainly embodied in the ball, the valve seat and the corresponding sealing elements, the combined shell of the left valve body and the right valve body is only adaptive to the arrangement, and the advanced degree of design of the key components represents how high pressure level, what medium and how high temperature the valve can reliably operate on equipment.

Current situation of stamping assembly welding type hollow sphere

At present, the collective behavior of the whole supply chain link of a huge supply and demand market is that a standard solid sphere is not completely selected as a due choice, a hollow sphere which is assembled and welded after being punched by adopting a non-standard steel pipe is used under the rule that the standard solid sphere can be used in a honored manner in many times, the hollow sphere runs in a model lake state which does not bear great risks on the ideas of supply and demand parties, and the common phenomenon is that the ball valve frequently runs in equipment due to the artificial control of price competition advantages and large-scale irregular behaviors.

Current situation two of stamping assembly welding type hollow sphere

Because the hollow sphere formed by the steel pipe in the forming die is commonly used with low price, the worry problem is that not all users can carefully and reasonably select the hollow sphere, the section of the hollow sphere which bears the switching torque is often damaged due to complex moment overload when the hollow sphere is improperly configured, and the occurrence of the deformation fault of the external characteristics of the sphere makes the valve difficult to open and close, so that the production equipment cannot normally operate.

Stamping assembly welding type hollow sphere structure and manufacturing process

The hollow floating ball is formed by pressing steel pipe or steel plate in forming mould, and the middle part of the ball is fixed on the inner wall of the ball by welding, and the two ends of the hollow circular arc extending out of the reduced diameter of the ball are welded together by the hollow pipe fitting identical to the pipe in a fixed mode.

Problems with stamping and assembling hollow spheres

Although the hollow sphere made of chrome-nickel steel with excellent corrosion resistance can replace a solid sphere to a certain extent under the working condition of soft sealing or the working condition that a surface coating is easy to fall off, the hollow sphere is formed by pressing and assembling and welding a thin-wall hollow tube or a thin-wall steel plate, and the hollow sphere lacks the constraint of national or industry standard, so that the problem of difficult quality assurance exists. In addition, the hollow sphere can be normally used at normal temperature and normal pressure, but is very easy to deform due to the hollow structure in the occasions of high temperature, high pressure, low temperature, negative pressure and the like, and the ball valve is easy to be scrapped even if the ball valve cannot be sealed.

Current state of forged ball

The misunderstanding of the selective use of solid spheres may not be the only factor, and the main reason is that the solid spheres must be forged and formed, are solid structures with unequal wall thicknesses, and have the problems of excessive mass, excessive price and the like, which are generally unacceptable. In addition, the oversized ball places a very heavy burden on the shell structure of the ball valve (e.g., the minimum design weight of a solid ball for a large diameter 56 "1500 mm ball valve on a pipeline transporting petroleum and gas reaches 27340 kg). In summary, solid spheres are the option of having to work with plumbing that must and other risks that cannot be assessed, with the result that liability is ultimately linked to wind hazards, which are directly proportional to the sphere diameter.

Anti-corrosion and wear-resistant layer spraying of spheres

In addition, the sphere of the carbon steel forging is also required to be coated with an anti-corrosion coating (such as amorphous nickel-phosphorus alloy) on the surface of the sphere or to ensure durability by using an expensive alloy spray welding (Stellite) process, and practice proves that the two methods have the possibility of different degree of coating abrasion and spray welding layer falling off the spherical body in use time, and if the safe integral chromium-nickel steel is used for replacing the coated carbon steel forging, the cost is very huge. Practice has shown that the overall cost of repairing coating wear and weld overlay fall off is not equal to 30% -50% of the total price of the ball valve, so this program is typically not among the options of equipment buyer budget.

Sealing problem of ball body and valve seat of soft sealing ball valve

The soft sealing ball valve is limited in the upper limit temperature, and the bottleneck is the upper limit temperature resistance of the material of the non-metal valve seat, but under the complex working conditions of high temperature and high pressure, and the relative movement of the ball body and the valve seat, the upper limit temperature resistance of the material cannot be regarded as the upper limit temperature resistance of the ball valve simply. Practice proves that, for example, a ball valve with a high-temperature-resistant nonmetallic valve seat (the material theory can resist 250-300 ℃) is arranged on a steam pipeline with the temperature of about 160 ℃ and the pressure of 0.6-0.7 MPa, the valve seat is expanded and deformed, if the assembly tolerance zone in the ball valve is not well controlled, the valve seat can cause great obstruction to the rotation of a ball body, a user usually considers that the ball valve is blocked during manual control, under the condition of industrial automation degree, the opening and closing of the ball valve is mostly driven by a pneumatic or electric actuator, and the ball body can easily pull out the valve seat due to enough torque of the actuator to damage, so that the ball valve loses tightness.

Thrust device for sealing ball body and valve seat of hard sealing ball valve

The design of the ball body and the valve seat of the metal sealing ball valve to obtain the sealing effect is realized in a spring and sealing ring mode, so that typical sealing devices of the two springs and the valve seat to the ball body are 23 and 24 in the attached drawings, and the sealing effect can be completely lost if the ball valve is completely blocked due to poor capability of pushing the valve seat of the ball valve due to existence of a space for entering impurities, and the occurrence time of the unavoidable events and the quantity of the impurities in the pipeline are in mechanical proportion relation only with different lengths of time. These objectively existing factors are responsible for the short life of metal seal ball valves. If the valve is shut down and maintained, huge cost is required.

Shaft hole ratio of valve rod

A further long-felt problem with ball valves is that the ratio of the length of the shaft bore of the valve stem to the length of the shaft, which affects the sealing performance of the valve stem and the packing, is prone to leakage of the medium. It is not theoretically reasonable to consider that the two ends of the shaft fit into the holes in a manner equal to the diameter of the holes or 1.2 times, and it must be recognized that a more stable effect is obtained only when one end of the shaft fits into the holes 1.5 times or longer. At present, the ratio of the valve rod to the shaft hole of the ball valve cannot meet the requirements, and the problem that the valve rod is expected to extend upwards to the shaft hole ratio matched with the lower part of the packing gland is solved; the length of the lower part of the packing gland and the length of the packing hole can not reach the reasonable ratio of the shaft hole, and simultaneously, the outer diameter of the lower part of the packing gland contacted with the valve body and the inner diameter of the valve rod matched with the valve body have two tolerance zones, and the matching is designed for enabling the bolt connection valve body to smoothly compress the packing. Of course, the length of H1 and H2 in fig. 20 can be increased to ensure the shaft hole ratio, and another problem is that the valve stem 5 is increased in length beyond the large diameter 3a of the valve body 3 (at least for a smaller diameter ball valve). Not only does the shaft bore ratio of the ball valve described above affect sealing performance, but these instabilities also pose a risk of increased torque on and off of the ball valve and rapid wear of the valve stem and its cooperating parts (see, for details, figures 3, 4, 5, and 6 of fig. 20).

The technical scheme of the invention aims to solve the technical problems.

Disclosure of Invention

In order to overcome the defects, the invention aims to provide a reinforced ball of a universal ball valve, a combined valve seat formed by different materials and various forms and a metal sealing ball valve for reinforcing the working stability of a valve rod.

The metal sealing ball valve of the reinforced ball body and the combined valve seat is characterized by comprising a reinforced ball body provided with various alternative schemes, a combined valve seat provided with various alternative schemes and a valve seat gland 7, a left body 1, a right body 3, a valve shell formed by fastening connecting bolts 15, the reinforced ball body comprises a1 st ball body 2 and a2 nd ball body 29,

The combined valve seat comprises a sealing pair consisting of a 1 st combined valve seat 9, a 2 nd combined valve seat 10, a 3 rd combined valve seat 11, a 4 th combined valve seat 12, a 5 th combined valve seat 13 and a 6 th combined valve seat 14,

The left body 1 and the right body 3, the arrangement of the step grooves 1a and 1b of the left body 1 and the right body 3 have the characteristic of mirror direction,

The valve seat gland 7, the large diameter 7a is placed in the hole 1c of the left body 1, the conical surface 7b is selectively contacted with the conical surface on a combined valve seat, and the arrangement has a mirror-oriented characteristic in the right body 3.

The 1 st sphere 2, one is a casting mold, and the outer sphere 2a, the inner sphere 2b, the upper connecting body 2g and the lower connecting shaft 2n are integrally formed on the pipe fitting 2 h;

Sphere 1, sphere 2, the other is a forging type, wherein the left hemisphere 20 and the right hemisphere 21 are connected with the reinforcing ring 22, the supporting tube 19, the upper connecting piece 17 and the lower connecting piece 18 to be combined into a whole through butt welding.

The 2 nd ball 29, the outer sealing surface 29q is formed on one flow channel 29b with tubular characteristics, wherein, on the sealing surface 29q on both sides of the flow channel 29b with tubular characteristics, an open round opening 29w which is consistent with the sphere diameter is formed, and a wall thickness 29f which is equal to the wall thickness of the flow channel 29b with tubular characteristics is formed, and a sealing band which extends to 29a along the large diameter direction extends from the round opening 29w to the round arc 29c.

The upper opening 2f of the outer spherical surface 2a of the sphere 2 is arranged at an angle a from the centre of the sphere 2, and the opening 2f of the outer spherical surface 2a and the lower opening 2f have mirror-oriented characteristics.

An opening 2c is formed in the sphere 2 extending downwardly from one side of the outer spherical surface 2a to the inner spherical surface 2b, the opening 2c also being mirrored on the opposite side of the outer spherical surface 2 a.

The 1 st combined valve seat 9 is provided with a valve seat,

The large diameter 91a of the two 1 st metal valve seats 91 with equal width and L-shaped surfaces extending in opposite directions are closely attached back to back with the large surface of one of the 1 st metal valve seats having the same characteristics, the small diameter 91b is contacted with one surface 92a of the 1 st auxiliary valve seat 92,

The 1 st metal valve seat 91 and all peripheral surfaces of the 1 st auxiliary valve seat 92 are simultaneously contacted with the outer surface of the ball 2, one surface 7b of the valve seat gland 7, one surface 1a and the other surface 1b of the left body 1 to form a mutually sealed state.

A 2 nd combination valve seat 10,

An L-shaped 2 nd metal valve seat 101 has an inner face contacting the left body 1 and the ball 2 and projecting upward to the edge of the inner diameter 7b of the valve seat gland 7, and an outer long face 101a and a short face 101b respectively in close contact with one face 102a, an opposite face 102b, an inner face 102c and the respective faces of the 2 nd metal auxiliary valve seat 102 and the 2 nd auxiliary valve seat 103.

A 3 rd combined valve seat 11,

The inner diameter 111b of a 3 rd metal valve seat 111 having a U-shaped surface extending in the outward direction is in contact with one face 112a and the other face 112b of two 3 rd auxiliary valve seats 112 of the same feature,

Wherein, the surfaces of all the peripheries of the 3 rd metal valve seat 111 and the 3 rd auxiliary valve seat 112 are simultaneously contacted with the outer surface of the ball body 2, one surface 7b of the valve seat gland 7, one surface 1a and the other surface 1b of the left valve body 1 to form a mutually sealed state.

A 4 th combined valve seat 12,

A group of 2 nd metal valve seats 121 with the same width and length, the upper surface 121a of the auxiliary valve seat 122 is closely attached to the surface of the lower surface 122a of the 4 th auxiliary valve seat 122, the lower surface 121b is closely attached to the upper surface 122b of the 4 th auxiliary valve seat 122,

Wherein, all peripheral surfaces of the 2 nd metal valve seat 121 and the 4 th auxiliary valve seat 122 are simultaneously contacted with the outer surface of the sphere 2, one surface 7b of the valve seat gland 7 and one surface 1a and the other surface 1b of the left valve body 1 to form a mutually sealed state.

A 5 th combined valve seat 13,

The small diameter 131a of the 5 th metal valve seat 131 is inserted into the hole 1y of the left body 1, one part of the circular arc-shaped sealing surface formed upwards is contacted with the ball body (2), the other part is contacted with the inner surface 7p of the valve seat gland 7,

The inner surface of the 1 st seal 132 is placed in the small diameter 131a of the 5 th metal valve seat 131 with its circular arc surface 132a, and the large diameter 132n and the side surface 132u extending to one side of the circular arc surface 132a are in contact with the annular groove 1y of the left body 1 to form a seal.

A 6 th combined valve seat 14,

The 6 th metal valve seat 141 is a hollow section having a semicircular feature, wherein the outer face 141a is in contact with the outer face of the ball 2, the inner arc face 1k of the left body 1, the valve seat inner arc face 7e,

The outer arc surface 142a of the 2 nd seal 142 is in contact with the inner arc surface 141b of the 6 th metal valve seat 141 and the one surface 1w of the left body 1, and is in a sealed state.

The right body 3 is provided with a pair of grooves,

The upper part of the right body 3 is a rectangular platform 3w, the middle is provided with a hole 3v matched with the valve rod 5, and the lower part of the rectangular platform 3w is provided with an open space structure 3s for accommodating the packing pressing plate 6.

Advantageous effects

The combined valve seat formed by different materials and various forms can be selected to be matched with the ball body, and the valve seat can work under high temperature and high pressure.

By changing the structure, the reinforced sphere is formed by casting or forging and welding in an open structure, and a hollow structure does not exist, so that a plurality of problems caused by the hollow structure of the hollow sphere are effectively solved.

The reinforced sphere with the open structure is internally provided with a structure assembled with related parts, and the equivalent performance of the solid sphere is achieved by adopting a method of preventing the sphere from being damaged when the sphere receives torque force in the use process by adopting a reinforcing measure, so that the problems of unequal wall thickness, heavy weight and high manufacturing cost of the solid sphere are solved.

The sphere is made of chrome-nickel steel, and the surface of the sphere made of stainless steel is not coated with a complex corrosion-resistant alloy layer, so that the process cost of a processing link is reduced, and meanwhile, the production cost is also reduced.

The axial length ratio of the valve rod in the valve body is increased, so that the sealing between the valve rod and the filler is facilitated, and the working stability of the ball valve is improved.

Drawings

FIG. 1 is a cross-sectional view of a 1 st combination seat and a 2 nd combination seat ball valve.

FIG. 2 is a cross-sectional view of a combination seat 3 and a combination seat 4 ball valve.

FIG. 3 is a cross-sectional view of a 5 th combination seat and 6 th combination seat ball valve.

Fig. 4 is a cross-sectional view of the sphere 2 of fig. 1, 2, 3.

Fig. 5 is a cross-sectional view of the sphere 2 of fig. 4 cut from the middle.

Fig. 6 is a perspective view of the sphere 2 of fig. 4.

Fig. 7 is a cross-sectional view of the sphere of fig. 6 taken from the middle.

Fig. 8 is a cross-sectional view of the sphere of fig. 7 taken from the middle.

Fig. 9 is a cross-sectional view of a commercially available hollow solder ball.

FIG. 10 is a perspective view of a middle reinforcing bar of a sphere

Fig. 11 is a cross-sectional view of the sphere of fig. 10 taken from the middle.

FIG. 12 is a cross-sectional view of the sphere of FIG. 10 taken from the side

Fig. 13 is an enlarged cross-sectional view of the combination valve seat of fig. 1.

Fig. 14 is an enlarged cross-sectional view of the combination valve seat of fig. 1 and 2.

Fig. 15 is an enlarged cross-sectional view of the combination valve seat of fig. 2 and 3.

Fig. 16 is an enlarged cross-sectional view of the combination valve seat of fig. 2, 4.

Fig. 17 is an enlarged cross-sectional view of the combination valve seat of fig. 3, 5.

Fig. 18 is an enlarged cross-sectional view of the combination valve seat of fig. 3, 6.

Fig. 19 is a cross-sectional view of the stem aspect ratio of the ball valve of fig. 1, 2, 3 of the present invention.

FIG. 20 is a cross-sectional view of the axial length ratio of the valve stem of a commercially available ball valve.

FIG. 21 is a schematic cross-sectional view of the 1 st composite valve seat before molding.

Fig. 22 is a schematic cross-sectional view showing a state of contact with the ball 2 after molding of the 1 st combination valve seat.

FIG. 23 shows an additional thrust device for pressurizing a ball with a commercially available metal seal ball valve.

FIG. 24 is another additional thrust device for pressurizing a ball with a commercially available metal seal ball valve.

Fig. 25 is a front cross-sectional view of the sphere 29.

Fig. 26 is a right side cross-sectional view of the sphere 29 of fig. 25.

Fig. 27 is a perspective view of the sphere 29 of fig. 25.

The following are the reference numerals

Left body 1 …

2 … Ball

3 … Right body

4 … Filler

5 … Valve rod

6 … Packing press plate

7 … Valve seat gland

8 … Screw

9 … St combined valve seat

91 … St metal valve seat

92 … St auxiliary valve seat 1 st

10 … Nd combination valve seat

101 … Nd metal valve seat

102 … Metal auxiliary valve seat

103 … Nd auxiliary valve seat

11 … Rd combined valve seat

111 … Rd metal valve seat

112 … Rd auxiliary valve seat

12 … Th combined valve seat

121 … Th metal valve seat

122 … Th auxiliary valve seat 4

13 … Th combined valve seat

131 … Th metal valve seat

132 … St seal 1

14 … Th combined valve seat

141 … Th metal valve seat

142 … Nd seal

15 … Bolt

16 … Sealing gasket

17 … Upper connecting piece

18 … Lower connecting piece

19 … Support tube

20 … Left hemisphere

21 … Right hemisphere

22 … Reinforcing ring

23 … Belleville spring

24 … Thrust pad

25 … Sealing ring

26 … Float valve seat

27 … Spring seat

28 … Compression spring

29 … Ball

Detailed Description

Application example [1]

A left body 1, a right body 2,

Referring to fig. 1, 2 and 3, as with the exterior of a conventional ball valve, these views show a two-piece construction of a valve housing for a universal floating ball valve. To reduce the number of views and facilitate view browsing, a 1 st combination valve seat and a 2 nd combination valve seat have been arranged in fig. 1, a 3 rd combination valve seat and a 4 th combination valve seat have been arranged in fig. 2, and a 5 th combination valve seat and a 6 th combination valve seat have been arranged in fig. 3. In these views, the valve seat gland 7 is fixedly connected with the left body 1, the right body 2 and various different combined valve seats in the same structural mode.

Application example [2]

A plurality of combined valve seats of 1 st to … th 6 th, a valve seat gland 7,

The above not only acts on the two-piece floating ball valve, but also can be applied to three-piece or fixed ball valves according to different pressure and temperature scenes.

Application example [3]

The spherical body 2 is provided with a plurality of grooves,

Referring to fig. 4, it is known that the knowledge of cutting off the medium when closing the ball valve is performed on the annular sealing surface of the rotary sphere 2 to close the inlet and outlet valve seat, so that the occupation of the rotary sphere 2 except the area required for mutual contact can be considered as a part which can be omitted, wherein the rotary sphere further comprises an opening which is cut inwards of the longitudinal upper part 2f of the sphere 2 and an opening which is cut inwards of the longitudinal bottom part 2f, and the two openings are sized to meet the requirement of the casting mould manufacturing process except the maximum diameter (such as a sealing part 2 a) of the contact between the valve seat and the sphere 2.

Application example [4]

The spherical body 2 is provided with a plurality of grooves,

Referring to fig. 4, 5 and 6, considering that the valve can be opened or closed safely at all times by increasing the resultant force of the ball 2, which receives the pressure of the pipeline when contacting the valve seat, and converting the proper specific sealing pressure into the valve stem torque, there are provided inner spherical surfaces 2b on both sides of the central transverse cross section of the ball 2, wherein the large diameter 2c of the inner spherical surface 2b integrated with the ball 2 is substantially consistent with the size of the longitudinal opening 2f of the ball 2, and the small diameter 2d is also formed on the support tube 2k in an asymptotic manner in the integrated state.

The inner spherical surface 2b and the support tube 2k are combined with each other to have the same wall thickness.

The position of the inner sphere 2b formed on the support tube 2k and the sphere 2 in the sphere 2 has a mirror-like character

Application example [5]

The spherical body 2 is provided with a plurality of grooves,

Referring to fig. 4, 5, 6, 7, 8, the advantage of the cut-in openings in the upper longitudinal portion 2f and the cut-in openings in the lower longitudinal portion 2f is that, on the one hand, unnecessary material consumption is reduced, and on the other hand, it is possible to achieve a more complex single curved structure inside the reinforced sphere to be released from the mould, for example, in accordance with a combined core-pulling process that generally necessitates the creation of a mould prior to investment casting.

Application example [6]

An upper connector 2g on the ball 2,

Referring to fig. 4, 5, 6, 7 and 8, the operation of opening and closing the ball valve is performed by the action of driving the ball 2 to the external valve rod 5, and in this project, the transmission torque associated with the valve rod 5 is one of the important tasks, so the scheme is adopted that the connecting piece 2g on the head of the connecting valve rod 5 is arranged on the supporting tube 2k, so that the transmission torque mode far away from the sealing surface 2a of the ball 2 can ensure the sealing performance of the ball 2 and the combined valve seat not to be influenced by deformation to the greatest extent.

The arrangement of the connection with the connector 2g on the head of the valve rod 5 can take various forms, the round table of the head 2g of the floating sphere 2 shown in fig. 4 is not represented as the only choice, and the arrangement of the more stable key is carried out in a reliable manner according to the difference of medium and pressure temperature and the condition of the required moment, and the guarantee of safe transmission practice proves.

Application example [7]

The ball 2, hemisphere 20 and reinforcing ring 22 are combined with forge welding of the upper and lower connectors 18, 17,

Reference is made to fig. 10 (three-dimensional perspective), 11 (merging state), 12 (assembly welding state).

In the transportation of petroleum and natural gas, the requirements of ball valves and the service life equivalent to the pipeline 30 years, such as large ball valves (such as 20-56 inches in English and 500-1500 mm diameter valves in metric), are not met by castings, the strength requirements of the materials are met, the requirements are met by forging materials (including the valve bodies and the spheres of the ball valves), and the valve bodies are welded together by two or more pieces and are named as all-welded ball valves.

The problem of structural defects of these ball valves balls has been mentioned in the background art, the unit being a 1500mm (typically a ball radius r=0.8-0.95, with a minimum radius of 1200mm being chosen) ball mass of around 27340 kg which is rare, which can reduce these weight-loss-avoiding approaches, such as the addition of a stiffening ring 22 as shown in fig. 10 at the inner maximum diameter of the currently marketed hollow ball like that of fig. 9, to increase the compressive strength.

This forge welding, or ideal shaping as the sphere 2 to be understood as a splice, is performed in two parts, such as by pressing or forging the plate to pre-form the left hemisphere 20 into an open structure suitable for welding to be performed there from, while adding a stiffening ring 22 and then mirror the left hemisphere 20 to the right hemisphere 21, inserting the support tube 19, also including the upper and lower connectors 17 and 18, like the upper connector 17, into the stiffening ring 22 for the desired full set welding to each other.

There are a number of arrangements of the upper and lower connectors 17, 18 formed on the support tube 19 to the exterior, such as the valve stem 5, and this is illustrated only in terms of a ball assembly, and some specific features relating to securing the ball of an all-welded ball valve to the exterior are not within the scope of the discussion of this item.

The medium flow diameters of these spheres for ball valves on petroleum, natural gas pipelines are typically the smallest suitable diameters for use in diameters of 40mm to over 1000mm or more.

The spherical shell is formed by a steel pipe or a steel plate in a forming die according to different thickness requirements of the use pressure, and the required spherical shape is generally finished in a conventional cold pressing or heating pressing mode.

The processing technology for manufacturing the ball body, which is consistent with the valve body of the all-welded ball valve, basically operates similarly from equipment to quality detection, so that the same effect can be achieved without the investment of about two thirds of materials and major equipment.

Application example [8]

The 1 st combined valve seat 9 is provided with a valve seat,

Referring to figure 13 of the drawings,

The 1 st combined valve seat 9 is formed by a method of combining the 1 st metal valve seat 91 and the 1 st auxiliary valve seat 92, wherein the 1 st metal valve seat 91 is an L-shaped surface with two identical characteristics, one L-shaped surface extends to one side in the large diameter direction and the other L-shaped surface extends to one side in the small diameter direction in the combination, an upper part 91a and a lower part 91a extending upwards from the L-shaped surface are arranged in the middle of the two 1 st auxiliary valve seats 92 with identical characteristics in a back-to-back mode, the other surface 91b is tightly attached to the surface 92a of the 1 st auxiliary valve seat 92, and the L-shaped surfaces in the two 1 st metal valve seats 91 are sealing surfaces 91c which form consistent fit with the sealing surfaces 2v of the ball body.

Application example [9]

1 St metal valve seat 91

With reference to figure 21 of the drawings,

The high temperature metal sealing ball valve, namely the sealing parts contacted with each other, are all made of metal and can continuously and safely run under the high temperature working environment, the national standard of the temperature valve is designated as less than or equal to 425 ℃, therefore, the 1 st metal valve seat 91 is usually made of a stainless austenitic steel sheet with about 1.5mm which is composed of a plurality of chemical elements such as chromium, nickel, molybdenum, titanium and the like and is commercially available, and the preset semi-finished product is formed by adopting a common blanking and hemming mode to obtain an annular part with a horizontal 91a extending towards one side in a right angle shape with an L-shaped surface.

Application example [10]

1 St auxiliary valve seat 92

With reference to figure 21 of the drawings,

The 1 st auxiliary valve seat 92 is usually formed into a prepared annular piece by using a commercially available high-temperature high-pressure asbestos rubber plate through a common blanking method, and has the functions of filling the space on one side of the L surface of the 1 st metal valve seat 91, pressing the 1 st metal valve seat 91 against the ball 2 to form mutual sealing when the left body 1 and the right body 3 are connected through the fastening bolt 15, and providing a clearance for micro elastic deformation to the 1 st metal valve seat 91 by using the flexible characteristic of the 1 st auxiliary valve seat 92 material, wherein the energy of the micro elastic action on the ball 2 is the condition required by mutual sealing specific pressure.

Application example [11]

1 St metal valve seat 91 and 1 st auxiliary valve seat 92

With reference to figure 22 of the drawings,

The 1 st metal valve seat 91 of the semi-finished product preset by the 1 st combined valve seat 9 and the 1 st auxiliary valve seat 92 of the prepared annular part are mutually pressed into a form with an angle a of 90 degrees with the sealing surface 2v of the sphere 2 in a forming model in a mode of being bonded and combined together, and a blank which is convenient to mechanically process into a sealing auxiliary product is obtained through aging air drying or heating drying.

Application example [12]

The 1 st combined valve seat 9 is provided with a valve seat,

Referring to figure 13 of the drawings,

The 1 st combined valve seat 9 is defined on the left body 1 and the right body 2 in such a way that two surfaces of the outer periphery of the 1 st metal valve seat 91 and the 1 st auxiliary valve seat 92 are respectively contacted with the small diameter 1a of the conical groove of the left body and the upwardly extending large-diameter straight-angle annular surface 1b, and the other surface is contacted with the conical surface 7b of the valve seat gland 7, and is connected by a bolt 8 and pushed forward to be fixed inside the left body 1 and the right body in a gradual compression mode.

Application example [13]

Aspect ratio of the 1 st combined valve seat 9

With reference to figures 9, 21 and 22 of the drawings,

The ratio of the width M to the length F of the 1 st combined valve seat 9 is calculated without a fixed value, the width-to-length ratio is generally set according to 1.5 times under the condition that the medium-pressure ball valve is less than or equal to 4.0MPa, and the pressure of the high pressure is more than or equal to 4.0MPa, which is selectable, is lower than the value, so that the sealing performance and the service life are influenced by the fact that the ball 2 can bear larger deformation of the maximum load when the ball valve is closed due to the fact that the pressure of the ball 2 on the 1 st combined valve seat 9 exceeds the maximum load.

Application example [14]

1 St combined valve seat 9

Referring to figure 13 of the drawings,

The 1 st combined valve seat 9 is formed by arranging two upper and lower parts 91a of a group of 1 st metal valve seats 91 extending upwards in an L-shaped surface back to back in the middle of two 1 st auxiliary valve seats 92 with the same characteristics, and the 1+1=2 centralized combination mode is equivalent to increasing the thickness of the metal valve seats, and the mode means that the compressive strength is improved, so that the valve seat is suitable for working under relatively high pressure, such as pipeline equipment devices with the pressure of more than or equal to 4.0 MPa.

Application example [15]

2 Nd combination valve seat 10

Referring to figure 14 of the drawings,

The 2 nd metal valve seat 101 in the 2 nd combined valve seat 10 has an L-shaped surface protruding upward to the edge of the inner diameter 7b of the valve seat gland 7, wherein the L-shaped inner spherical surface 101c is fitted with the spherical 2 sealing surface 2v, and the outer long surface 101a and the short surface 101b are respectively in close contact with one surface 102a of the 2 nd metal auxiliary valve seat 102, the opposite surface 102b, the inner surface 102c and the respective surfaces of the 2 nd auxiliary valve seat 103.

The 2 nd combined valve seat 10 is defined on the left body 1 and the right body 2 in such a way that two surfaces of the outer periphery of the 2 nd metal valve seat 101 and the 2 nd auxiliary valve seat 102 are respectively contacted with the small diameter 1a of the conical groove of the left body and the upwardly extending large-diameter straight-angle annular surface 1b, and the other surface is contacted with the conical surface 7b of the valve seat gland 7, and is connected by a bolt 8 and pushed forward to be fixed inside the left body 1 and the right body in a gradual compression mode.

Other application features are, for example, substantially similar to application example [9], application example [10], application example [11], application example [13 ].

Application example [16]

2 Nd combination valve seat 10

Referring to figure 14 of the drawings,

The 2 nd metal valve seat 101 in the 2 nd combined valve seat 10 is provided with an L-shaped surface which extends upwards to the edge of the inner diameter 7b of the valve seat gland 7, wherein the 2 nd metal auxiliary valve seat 102 is clamped at the middle of the 2 nd auxiliary valve seat 103 and the 2 nd metal valve seat 101 with an L-shaped surface, and the combination mode of dispersing the 2 nd metal valve seat 101 and the 2 nd metal auxiliary valve seat 102, which is easy to form, is suitable for the metal sealing ball valve with the pressure temperature of less than or equal to 4.0MPa and less than or equal to 350 ℃.

Application example [17]

3 Rd combined valve seat 11

With reference to figure 15 of the drawings,

The 3 rd combined valve seat 11 is a U-shaped surface 111 which is stretched out from the outside, the compression strength of the U-shaped surface is higher than that of the L-shaped surface of the 2 nd metal valve seat 101 of the 2 nd combined valve seat 10, the inner diameter 111b of the 3 rd metal valve seat 111 is contacted with one surface 112a and the other surface 112b of the 3 rd auxiliary valve seat 112 with the same characteristics,

In use, the 3 rd auxiliary valve seat 112 is inserted in a slit-like manner in the groove of the U-profile 111,

The application range is less than or equal to 4.0MPa and the pressure temperature is less than or equal to 350 ℃ as discussed in application example [16 ].

Application example [18]

4 Th combined valve seat 12

With reference to figure 16 of the drawings,

A 4 th combined valve seat 12, a group of 4 th metal valve seats 121 with the same width and length, an upper surface 121a of the auxiliary valve seat 122 is clung to a surface of a lower surface 122a of the 4 th auxiliary valve seat 122, a lower surface 121b is clung to an upper surface 122b of the 4 th auxiliary valve seat 122,

Wherein, the surfaces of all the peripheries of the 4 th metal valve seat 121 and the 4 th auxiliary valve seat 122 are simultaneously contacted with the outer surface of the ball body 2, one surface 7b of the valve seat gland 7 and one surface 1a and the other surface 1b of the left valve body 1 to form a mutually sealed state.

Application example [19]

4 Th combined valve seat 12

With reference to figure 16 of the drawings,

The sealing surface of the 4 th metal valve seat 121 and the sealing surface of the 4 th metal auxiliary valve seat 122 in the 4 th combined valve seat 12 are simultaneously contacted with the sealing surface 2v of the ball body 2, wherein 34 th metal auxiliary valve seats 122 with the same characteristics are arranged in the middle of 34 th auxiliary valve seats 122 with the same characteristics, the sealing surfaces of the 4 th metal valve seats 121 are hard surfaces and the sealing surfaces of the 4 th metal auxiliary valve seats 122 are in a soft surface structure, and the combined mode of mutually staggered isolation is suitable for metal sealing ball valves on steam medium pipeline devices with the requirements of higher zero leakage less than or equal to 4.0MPa or pressure more than or equal to 4.0MPa and the temperature less than or equal to 350 ℃.

Application example [20]

5 Th combined valve seat 13

With reference to figure 17 of the drawings,

The small diameter 131a of the 5 th metal valve seat 131 of the 5 th combined valve seat 13 is inserted into the hole 1y of the left body 1, one part of the circular arc-shaped sealing surface formed upwards is contacted with the ball 2, the other part is contacted with the inner surface 7p of the valve seat gland 7,

Application example [21]

1 St seal 132

With reference to figure 17 of the drawings,

The metal seal ball valve is arranged in the small diameter 131a of the 5 th metal valve seat 131 and is made of common flexible graphite, medium leakage from the inside of the left body 1 and the right body 2 to the other side of the pipeline (namely, the phenomenon of internal leakage of the valve which is commonly known as non-standard) is prevented from being caused when the ball valve is in a closed state, and the metal seal ball valve is suitable for the metal seal ball valve on the steam medium pipeline device with the zero leakage of less than or equal to 4.0MPa or the pressure of more than or equal to 4.0MPa and the temperature of less than or equal to 600 ℃.

Application example [22]

5 Th metal valve seat 131

With reference to figure 17 of the drawings,

The thickness of the 5 th metal valve seat 131 can be designed according to different requirements of equipment pipeline pressure and temperature and different thicknesses capable of bearing pressure.

Application example [23]

6 Th combined valve seat 14

Referring to figure 18 of the drawings,

Application example [24]

6 Th metal valve seat 141, 2 nd seal 142

Referring to figure 18 of the drawings,

The features of this application example are substantially similar to those of application example [21] and application example [22] described above, and therefore, description thereof will not be repeated.

Application example [25]

Right body (3), valve rod axial length ratio

With reference to figure 19 of the drawings,

The upper part of the right body (3) is provided with a rectangular platform (3 w), a hole (3 v) matched with the valve rod (5) is arranged in the middle of the platform (3 w) for facilitating the connection requirement of the automatic control device which is increasingly developed at present, and an open space structure (3 s) for accommodating the packing pressing plate (6) is arranged below the rectangular platform (3 w).

Application example [26]

Right body (3), valve rod axial length ratio

With reference to figure 19 of the drawings,

A hole (3 v) matched with the valve rod 5 is formed in the middle of the rectangular platform (3 w), and the structure is equal to that of a valve rod with a height which meets the axial length ratio of a stable valve rod and is H, so that the axial length ratio of the valve rod of the floating ball valve or the fixed ball valve is suitable for the setting requirement.

Application example [27]

A sphere (29),

With reference to figures 25, 26 and 27 of the drawings,

The spherical body 29 is provided with a plurality of grooves,

The sphere 29 differs from the sphere 2 described above in that the integrated molding is easy and also meets the requirement of similar equal wall thickness, the outer sealing surface 29q of such a sphere 29 being formed over a flow channel 29b having e.g. a tubular feature, wherein an open round 29w corresponding to the sphere's path is formed over the sealing surface 29q on both sides of the flow channel 29b of the tubular feature and a wall thickness 29f equal to the wall thickness of the flow channel 29b of the tubular feature is formed, and a sealing band extending in the major diameter direction over the round 29w to 29a and transitioning to a circular arc 29c.

Application example [28]

A sphere (29),

With reference to figure 27 of the drawings,

The ball 29 is not limited to the sealing band extending from the circular port 29w to the circular port 29a in the large diameter direction and transiting to the circular arc 29c as described above, and may be provided as a single plane at the lower sealing band 29a and the circular arc 29c connected by the 29 e.

Claims

1. A metal sealing ball valve for reinforcing a ball body and a combined valve seat comprises the ball body, the valve seat, a valve seat gland (7), a left body (1), a right body (3) and a valve housing formed by fastening connecting bolts (15),

The ball body is provided with a plurality of holes,

Is a structure-enhanced sphere, the sphere is a 1 st sphere (2) or a2 nd sphere (29),

A valve seat,

The valve seat is a combined valve seat capable of forming a sealing pair, and the combined valve seat comprises six combination modes, and the combination modes are as follows: the 1 st combined valve seat (9), the 2 nd combined valve seat (10), the 3 rd combined valve seat (11), the 4 th combined valve seat (12), the 5 th combined valve seat (13) and the 6 th combined valve seat (14)

A left body (1) and a right body (3),

The arrangement of the step grooves (1 a, 1 b) of the left body (1) and the right body (3) have the characteristic of mirror direction,

A valve seat gland (7),

The large diameter (7 a) is arranged in the hole (1 c) of the left body (1), the conical surface (7 b) is selectively contacted with the conical surface on a combined valve seat, and the arrangement in the right body (3) has the characteristic of mirror direction.

2. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

The 1 st sphere (2),

One is a casting mold, and an outer spherical surface (2 a), an inner spherical surface (2 b), an upper connecting body (2 g) and a lower connecting shaft (2 n) are integrally formed on a pipe fitting (2 h);

The other is a forging type, wherein the left hemisphere (20) and the right hemisphere (21) are connected with the reinforcing ring (22), the supporting tube (19), the upper connecting piece (17) and the lower connecting piece (18) to form a whole through welding.

3. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

A 2 nd ball (29),

The outer sealing surface (29 q) is formed on a flow channel (29 b) with tubular characteristics, wherein an open round opening (29 w) which is consistent with the path of the sphere and has the same wall thickness (29 f) as the flow channel (29 b) with tubular characteristics are formed on the sealing surface (29 q) on two sides of the flow channel (29 b) with tubular characteristics, and a sealing strip extending to the (29 a) along the large diameter direction at the round opening (29 w) is transited to a circular arc (29 c).

4. The enhanced ball and combined seat metal seal ball valve of claim 1 or claim 2, wherein,

A sphere (2),

The position of the opening (2 f) at the upper part of the outer sphere (2 a) from the center of the sphere (2) is arranged at an angle a, and the opening (2 f) of the outer sphere (2 a) and the lower hole have mirror-oriented characteristics.

5. The enhanced ball and combined seat metal seal ball valve of claim 1 or claim 2, wherein,

A sphere (2),

An opening (2 c) is formed in the sphere (2) extending downwardly from one side of the outer sphere (2 a) to the inner sphere (2 b), the opening (2 c) being mirrored on the opposite side of the outer sphere (2 a).

6. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

A 1 st combined valve seat (9),

The large diameter (91 a) of the two 1 st metal valve seats (91) with equal width and L-shaped surfaces extending in opposite directions are closely attached back to back with the large surface of one of the two metal valve seats with the same characteristics, the small diameter (91 b) is contacted with one surface (92 a) of the 1 st auxiliary valve seat (92),

The metal valve seat (91) and the auxiliary valve seat (92) of the 1 st are in contact with the outer surface of the sphere (2), one surface (7 b) of the valve seat gland (7) and one surface and the other surface of the left body (1) at the same time to form a mutually sealed state.

7. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

A 2 nd combined valve seat (10),

An L-shaped 2 nd metal valve seat (101) is in contact with the left body (1) and the ball body (2) and extends upwards to the edge of the inner diameter of the valve seat gland (7), and a long surface (101 a) and a short surface (101 b) of the outer surface are respectively closely contacted with one surface (102 a), the opposite surface (102 b), the inner surface (102 c) and the 2 nd metal auxiliary valve seat (103) of the 2 nd metal auxiliary valve seat (102).

8. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

A 3 rd combined valve seat (11),

The inner diameter (111 b) of a 3 rd metal valve seat (111) with a U-shaped surface extending outwards is contacted with one surface (112 a) and the other surface (112 b) of a 3 rd auxiliary valve seat (112) with the same characteristics,

The metal valve seat (111) and the auxiliary valve seat (112) of the 3 rd are in contact with the outer surface of the sphere (2), one surface (7 b) of the valve seat gland (7) and one surface and the other surface of the left body (1) at the same time to form a mutually sealed state.

9. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

A 4 th combined valve seat (12),

A group of 4 th metal valve seats (121) with the same width and length, the upper surfaces (121 a) of the 4 th auxiliary valve seats (122) are clung to the surfaces of the lower surfaces (122 a) of the 4 th auxiliary valve seats (122), the lower surfaces (121 b) are clung to the upper surfaces (122 b) of the 4 th auxiliary valve seats (122),

All peripheral surfaces of the 4 th metal valve seat (121) and the 4 th auxiliary valve seat (122) are simultaneously contacted with the outer surface of the sphere (2), one surface (7 b) of the valve seat gland (7) and one surface and the other surface of the left body (1) to form a mutually sealed situation.

10. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

A 5 th combined valve seat (13),

The small diameter (131 a) of the 5 th metal valve seat (131) is inserted into the hole of the left body (1), one part of the circular arc sealing surface formed upwards is contacted with the sphere (2), the other part is contacted with the inner surface (7 p) of the valve seat gland (7),

The inner surface of the 1 st sealing element (132) and the circular arc surface (132 a) thereof are arranged in the small diameter (131 a) of the 5 th metal valve seat (131), and the large diameter (132 n) and the side surface (132 u) extending from the circular arc surface (132 a) to one side are in contact with the annular groove (1 y) of the left body (1) to form a sealing state.

11. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

A 6 th combined valve seat (14),

The 6 th metal valve seat (141) is a hollow section with semicircular characteristics, wherein the outer surface (141 a) is contacted with the outer surface of the sphere (2), the inner circular arc surface (1 k) of the left body (1) and the inner circular arc surface (7 e) of the valve seat,

The outer arc surface (142 a) of the 2 nd sealing member (142) is in contact with the inner arc surface (141 b) of the 6 th metal valve seat (141) and one surface (1 w) of the left body (1) and is in a sealing state.

12. The ball valve with enhanced ball and combined valve seat metal seal as claimed in claim 1 wherein,

A right body (3),

The upper part of the right body (3) is a rectangular platform (3 w), the middle is provided with a hole (3 v) matched with the valve rod (5), and an open space structure (3 s) for accommodating a packing pressing plate (6) is arranged below the rectangular platform (3 w).