CN111692372A - Fluid ball valve - Google Patents

Abstract

The application discloses a fluid ball valve, which comprises a valve body, a valve rod and a ball body; the valve rod is arranged in the valve body, and the lower end of the valve rod is connected with the ball body; the valve body is provided with a first outlet end and a second outlet end, and the first outlet end and the second outlet end are arranged on two opposite sides of the valve body; a fastening nut and a first sealing element are arranged between the valve body and the valve rod, wherein the first sealing element comprises at least one first metal sealing ring and at least one first non-metal sealing ring which are arranged around the valve rod, and the first metal sealing ring and the first non-metal sealing ring are alternately arranged in the axial direction of the valve rod; and the fastening nut and the first seal are used for sealing and connecting the valve rod to the valve body. The fluid ball valve can effectively improve the characteristics of the ball valve such as sealing property, corrosion resistance, wear resistance, low temperature resistance and the like.

Description

Fluid ball valve

Technical Field

The application relates to the technical field of mechanical design, in particular to a fluid ball valve.

Background

The ball valve, the opening and closing piece (ball) is driven by the valve rod and rotates around the axis of the ball valve. The ball valve has the characteristics of small volume, simple structure, convenient operation, wide application range and the like, is widely applied to fluid pipelines in various industries and is mainly used for cutting off, distributing and changing the flowing direction of a medium.

However, the ball valve uses a ball as an opening and closing member, and the ball has a large rotation angle and frequent times, so that the requirements on an internal sealing material and a sealing structure are high, and the common ball valves on the market at present are used for common working media such as water, solvents, acid, gas and the like. The currently common ball valves mainly have the following disadvantages: first, the connection is single, and a single ball valve usually has only one connection. Such as: the ball valves with different connection modes have the advantages that the ball valves with different connection modes are required to be met due to the fact that ports of the ball valves are integrally machined with the valve body, production cost is improved, and production efficiency is reduced. Secondly, the joint is fixed in position and cannot be used under special conditions. The connection port of a conventional ball valve is integral with the valve body so that the position fixation is not adjustable, which is hardly achievable if the pipe connected thereto is to be oriented. Thirdly, the conventional ball valve uses a relatively common sealing material and an insufficiently tight sealing structure, so that internal leakage and external leakage often occur when a low-temperature medium is introduced.

Therefore, there is a need in the art to develop a fluid ball valve, so as to overcome the disadvantages of the ball valve in the prior art, and effectively improve the characteristics of the ball valve, such as sealing performance, corrosion resistance, wear resistance, low temperature resistance, etc.

Disclosure of Invention

An object of this application is to provide a fluid ball valve, fluid ball valve can not only be used for general medium through special seal structure design, also can be used for ultra-low temperature medium, like liquefied natural gas, liquid nitrogen etc. has effectively strengthened the leakproofness of ball valve to the characteristics such as anticorrosive, wear-resisting, the low temperature resistant of ball valve have been improved.

The invention provides a fluid ball valve, which is characterized by comprising: a valve body, a valve rod and a ball body; the valve rod is arranged in the valve body, and the lower end of the valve rod is connected with the ball body; the valve body is provided with a first outlet end and a second outlet end, and the first outlet end and the second outlet end are arranged on two opposite sides of the valve body;

a fastening nut and a first sealing element are arranged between the valve body and the valve rod, wherein the first sealing element comprises at least one first metal sealing ring and at least one first non-metal sealing ring which are arranged around the valve rod, and the first metal sealing ring and the first non-metal sealing ring are alternately arranged in the axial direction of the valve rod; and the fastening nut and the first seal are used for sealing and connecting the valve rod to the valve body.

In another preferred embodiment, the fastening nut is used for compressing the first sealing element, thereby forming a sealing structure.

In another preferred embodiment, the first sealing element comprises 1-8 first metal sealing rings and 1-8 first non-metal sealing rings.

In another preferred example, the first metal sealing ring is made of copper or copper alloy.

In another preferred example, the first non-metallic sealing ring is made of polytetrafluoroethylene.

In another preferred embodiment, a main seal is provided between the inner surface of the valve body and the outer surface of the ball body, and the ball valve further comprises an elastic compensation bonnet mechanism which is provided at the first outlet end of the valve body and connects the first outlet end and the first connecting pipe by being engaged with a fastening nut at the first outlet end;

the outer side of the near end of the elastic compensation valve cap mechanism is in threaded connection with the inner side of the first outlet end of the valve body, and the inner side of the far end of the elastic compensation valve cap mechanism is in threaded connection with the outer side of the first outlet end fastening nut;

when the assembly is completed, the outer surface of the first elastic compensation flange is abutted against the outer surface of the main sealing element, and the first elastic compensation flange generates first elastic deformation towards the far end of the elastic compensation bonnet mechanism; and when the primary seal shrinks due to cold temperatures, the first elastic deformation is partially released, thereby compensating for a gap between the first elastic compensation flange and the primary seal, such that the elastic compensation bonnet mechanism remains sealed with the primary seal.

In another preferred embodiment, the proximal end of the elastic compensation bonnet means is further provided with a second elastic compensation flange extending inwards, when the assembly is completed, the outer surface of the second elastic compensation flange abuts against the end face of the proximal end of the first connection pipe, and the second elastic compensation flange is subjected to a second elastic deformation towards the proximal end of the elastic compensation bonnet means; and when the first connecting pipe is caused to shrink by the low temperature, the second elastic deformation is caused to be partially released, so that a gap between the second elastic compensation flange and the first connecting pipe is compensated, and the elastic compensation bonnet mechanism is kept sealed with the first connecting pipe.

In another preferred embodiment, a radially trapezoidal groove is formed in the inner circumference of the proximal end of the elastic compensating bonnet means to form the first elastic compensating bead and the second elastic compensating bead.

In another preferred embodiment, the first and second elastic compensating flanges are arranged from the proximal end to the distal end.

In another preferred embodiment, the first elastic compensation flange and the second elastic compensation flange are both annular flanges.

In another preferred embodiment, a first annular protrusion is arranged at the non-threaded part of the outer circumference of the elastic compensation bonnet mechanism, and the first annular protrusion is in interference fit with the inner circumferential surface of the valve body.

In another preferred example, the second outlet end is connected in the same or different manner as the first outlet end.

In another preferred example, the connection mode of the second outlet end is different from the connection mode of the first outlet end, the second outlet end is provided with a second connecting pipe and a second outlet end fastening nut, and the second outlet end is directly connected with the valve body in a sealing manner through the second connecting pipe and the second outlet end fastening nut.

In a further refinement, the first connecting tube and/or the second connecting tube are replaceable.

In a further refinement, the first connecting tube and/or the second connecting tube can be freely rotatable.

In another preferred example, a second metal sealing ring is arranged between the first connecting pipe and the elastic compensation valve cap mechanism, and/or a second metal sealing ring is arranged between the second connecting pipe and the valve body.

In another preferred example, the second metal sealing ring is made of copper or copper alloy.

In another preferred example, a second annular bulge is arranged on the close contact surface of the elastic compensation bonnet mechanism and/or the valve body and the second metal sealing ring.

In another preferred embodiment, the distal end of the resilient compensating bonnet mechanism includes an outwardly extending outer annular flange, and a third non-metallic sealing ring is disposed between contact of the outer annular flange and the valve body when the resilient compensating bonnet mechanism is assembled with the valve body.

In another preferred example, the third non-metallic sealing ring is made of polytetrafluoroethylene.

In another preferred example, the handle positioning block is arranged at the rear end of the handle.

The invention has the advantages of

The invention improves the internal structure in a plurality of ways under the condition of keeping the appearance and the operation mode of the conventional ball valve as much as possible, adopts the combination of hard seal and soft seal, sets a multi-layer seal structure in the easy leakage area, provides the design idea of an elastic compensation mechanism by considering the factors of easy shrinkage and deformation of a sealing element at low temperature and the like, and greatly improves the leakage condition in special circulating media. For the design of the outlet end, the multiple external connection modes can be met only by replacing the connecting pipe, so that the production cost is saved, the production period is shortened, and the use of customers is greatly facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary embodiments of the invention and that one skilled in the art may, without any inventive step, derive other embodiments from these drawings.

FIG. 1 is a schematic perspective view of a ball valve according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a ball valve according to an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of the structure of FIG. 2 taken along line A;

FIG. 4 is an enlarged view of a portion of the structure of FIG. 2 taken along line B, showing a schematic view of the first outlet end hard seal structure;

FIG. 5 is a schematic diagram of a configuration of a spring compensated bonnet mechanism of a ball valve according to an embodiment of the present application; FIG. 6 is an enlarged view of a portion of the structure of FIG. 5 taken along line C;

FIG. 7 is a side view of a ball valve according to an embodiment of the present application, showing a schematic position of a handle and a locating block of the ball valve of the embodiment of the present application;

fig. 8 is a comparative illustration of low temperature creep for different packing patterns (first seal configuration) according to an embodiment of the present application, wherein the first seal includes a first non-metal seal ring and a first metal seal ring arranged at intervals in fig. 8(a), and the first seal is formed by a non-metal seal gasket in fig. 8 (b).

In the drawings, the designations are as follows:

1-valve body

11-first outlet end

12-second outlet end

13-first connecting pipe

14-second connecting pipe

15-first outlet end fastening nut

16-second outlet end fastening nut

18-second metal sealing ring

2-valve stem

3-sphere

4-fastening nut

5-first seal

51-first metal seal ring

52-first non-metallic seal ring

6-main seal

7-elastic compensation valve cap mechanism

71-first elastic compensation flange

711-outer surface of first elastic compensation Flange

72-second elastic compensation flange

73-trapezoidal groove

74-outer annular Flange

75-first annular projection

76-second annular projection

8-third non-metallic sealing ring

9-handle

91-handle positioning block

Detailed Description

The invention designs a tight sealing structure, uses a mode of combining soft sealing and hard sealing, and adopts special sealing materials, thereby improving the characteristics of corrosion resistance, wear resistance, low temperature resistance and the like. Not only makes up for the common problems of the ball valve, but also enlarges the application range. The invention basically inherits the basic appearance of the ball valve, and can make customers more easily accepted and conveniently operated.

In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application may be implemented without these technical details and with various changes and modifications based on the following embodiments.

Term(s) for

As used herein, the terms "proximal" and "distal" refer to the "end near the center of the ball" as the "proximal" and "end away from the center of the ball" as the "distal" when the fluid ball valve of the present application is assembled;

the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In the case where there is no more restriction,

in the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

In the present invention, all the directional indications (such as up, down, left, right, front, rear, etc.) are used only to explain the relative positional relationship between the respective members, the motion situation, etc. in a certain posture (as shown in the drawing), and if the certain posture is changed, the directional indication is changed accordingly.

The basic working principle of the invention is as follows:

the ball valve of the invention has the function of shunting and is mainly used for pipelines of liquefied natural gas or liquefied petroleum gas and the like. The valve rod in the middle of the valve body is connected with the handle at the top and the opening and closing piece (ball) in the middle, and when the handle is positioned in the middle, the outlets at two ends are fully opened; when the handle is rotated 90 degrees anticlockwise or 90 degrees clockwise, the outlet in the same direction with the handle is closed, and the other outlet is still kept fully opened. There are two stoppers on the valve body of handle below, and the maximum rotation angle of handle can not be greater than 180. In other words, because the ball is open on three sides and one side is not open, the ball valve has the following three states: (1) an inlet and two outlets are opened; (2) the inlet is opened, the first outlet is opened, and the second outlet is closed; (3) the inlet is opened, the first outlet is closed, and the second outlet is opened.

The invention has at least the following advantages:

(a) by the elastic compensation valve cap mechanism in the ball valve, the internal leakage caused by the shrinkage and deformation of the main sealing element at low temperature is avoided;

(b) in order to prevent the plastic gasket at the outlet end of the conventional ball valve from low-temperature shrinkage deformation, the two outlet ends of the ball valve adopt hard-seal sealing structures, and the two outlet ends are connected in different ways, so that the corresponding increase of the contact area and the pressure is reduced, and the leakage is effectively prevented;

(c) in order to effectively relieve the shrinkage deformation of the filler at low temperature, the filler between the valve rod and the valve body of the fluid ball valve adopts a mode that the nonmetal sealing elements and the metal sealing elements are arranged at intervals, so that the volume of the nonmetal sealing elements is reduced, the shrinkage ratio is correspondingly reduced, the nonmetal sealing elements with small volume are easier to deform after being extruded by the fastening nut, the gap between the valve rod and the valve body can be better filled, and the leakage is prevented;

(d) the outlet end of the ball valve has various connecting modes, and only the ball valve connecting pipe is replaced without changing a valve body, so that the production is convenient, and the cost can be saved;

(e) the outlet connecting part of the ball valve can rotate, so that the direction and the position of an external connecting pipeline can be conveniently adjusted, and the problem can be solved by rotating the outlet connecting direction in the actual working condition that the external space is limited and the pipelines cannot be arranged, thereby greatly facilitating the actual use;

(f) the handle positioning block is positioned at the rear end of the handle, so that the occupation of limited space is reduced, and the condition that the handle cannot rotate freely in some working environments with narrow space is avoided.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

The application provides a fluid ball valve, this fluid ball valve can not only be used for general medium through special ingenious seal structure design, also can be used for ultra-low temperature medium, like liquefied natural gas, liquid nitrogen etc.. FIG. 1 is a schematic perspective view of a ball valve of the present application; fig. 2 is a schematic structural view of the ball valve of the present application.

As shown in fig. 1-2, the fluid ball valve of the present embodiment includes a valve body 1, a valve stem 2, a ball 3; the valve rod 2 is arranged in the valve body 1, and the lower end of the valve rod 2 is connected with the ball body 3; the valve body 1 is provided with a first outlet end 11 and a second outlet end 12, and the first outlet end 11 and the second outlet end 12 are arranged on two opposite sides of the valve body.

(a) Setting of ball valve packing (first seal)

A fastening nut 4 and a first sealing element 5 (namely, the ball valve packing of the present application) are arranged between the valve body 1 and the valve rod 2, wherein the first sealing element 5 comprises at least one first metal sealing ring 51 and at least one first non-metal sealing ring 52 which are arranged around the valve rod 2, and the first metal sealing ring 51 and the first non-metal sealing ring 52 are arranged alternately in the axial direction of the valve rod 2; and the fastening nut 4 and the first seal 6 are used for sealing the valve stem 2 to the valve body 1, wherein the fastening nut 4 is used for pressing the first seal 5, thereby forming a sealing structure. The packing of the conventional ball valve is integral, and leakage is easy to occur due to large volume and large contraction ratio at low temperature. In order to effectively alleviate the packing and contract deformation at low temperature, the nonmetal sealing member and the metal sealing member interval arrangement's of the packing adoption between valve rod 2 and the valve body 1 of this application mode, the volume of nonmetal sealing member has been reduced in this kind of ingenious setting, the shrink ratio also reduces correspondingly, and the nonmetal sealing member of small volume takes place deformation more easily after receiving fastening nut 4's extrusion, the clearance between packing valve rod 2 and the valve body 1 that can be better, prevent the leakage. In this embodiment, the first metal seal ring is made of copper or copper alloy, and the first nonmetal seal ring is made of teflon. In an embodiment, the first seal 5 may comprise 1-8 first metal seal rings and 1-8 first non-metal seal rings.

In the present application, the inventors give low temperature creep for different filler modes as follows:

as shown in fig. 8(a) -8(b), wherein fig. 8(a) is a schematic diagram of a first sealing element comprising spaced first non-metallic sealing rings and first metallic sealing rings, wherein there are 5 first non-metallic sealing rings and 5 first metallic sealing rings; fig. 8(b) is a comparative example of fig. 8(a) in which the first seal is formed by a non-metallic sealing gasket.

Axial comparison: assuming that the height of the entire packing (first seal) is 10mm, the shrinkage of the non-metallic seal ring at low temperature is 10% (10% is only a reference value). If the interval arrangement mode is adopted, the thickness of the first nonmetal sealing ring is only 5mm, and the whole body is only contracted by 0.5 mm. If an integral non-metallic seal ring (10 mm thick) is used, the seal ring shrinks by 1mm, and leakage is more likely to occur.

Radial comparison: 1. the packing (first sealing element) is positioned between the valve rod 2 and the valve body 1, and the packing is radially deformed by the extrusion of the upper end fastening nut 4, so that the packing is tightly contacted with the valve rod and the valve body to play a role in sealing. If be holistic non-metallic seal circle, the volume is very big, and under the same extrusion force, radial deformation probably only 0.1mm, adopts the mode of interval arrangement, and first non-metallic seal circle volume reduces, and the deformation takes place more easily after the compressive force effect, probably produces 0.2 mm's deformation. 2. Assuming a filler outer diameter of 12mm, the shrinkage is still 10%. The overall external diameter of the overall nonmetal sealing ring shrinks by 1.2mm at low temperature, and once leakage occurs, the whole packing fails. However, if the first non-metal sealing rings are arranged at intervals, 5 small first non-metal sealing rings are equivalent to 5 sealing rings, and even if part of the first non-metal sealing rings are shrunk and failed, the rest sealing rings can still function.

Therefore, through the mode that the nonmetal sealing member and the metal sealing member that adopt are arranged at intervals, the size of nonmetal sealing member has been reduced to this kind of ingenious setting, and the nonmetal sealing member of little volume receives more easy emergence deformation behind fastening nut 4's the extrusion moreover, and the clearance between filling valve rod 2 and the valve body 1 that can be better prevents to appear leaking.

(b) Connection of bonnet compensation mechanism to first outlet end

As shown in fig. 2 and 5, in order to put the ball 3 into the valve body 1, a hole with a large diameter (in this case, the first outlet end 11) is formed on one side of the valve body 1, and after the ball and the packing are put into the valve body, the ball and the packing are connected (threaded) with the hole through the elastic compensation bonnet mechanism 7, that is, the elastic compensation bonnet mechanism 7 is engaged with the valve body 1, is connected with the first outlet end 11 of the valve body 1, and is engaged with the first outlet end fastening nut 15 to connect the first outlet end 11 with the first connecting pipe 13; the outer side of the near end of the elastic compensation bonnet mechanism 7 is in threaded connection with the inner side of the first outlet end 11 of the valve body 1, and the inner side of the far end of the elastic compensation bonnet mechanism 7 is in threaded connection with the outer side of the first outlet end fastening nut 15.

A main seal 6 is arranged between the inner surface of the valve body 1 and the outer surface of the ball 3, in order to avoid inner leakage caused by contraction and deformation of the main seal 6 at low temperature, when the valve body 1 is assembled with the elastic compensation bonnet mechanism 7, the elastic compensation bonnet mechanism 7 is arranged at the first outlet end 11 and is used for extruding the main seal 6, the proximal end of the elastic compensation bonnet mechanism 7 is provided with a first elastic compensation flange 71 extending inwards, when the assembly is completed, the outer surface 711 of the first elastic compensation flange is abutted against the outer surface of the main seal 6, and the first elastic compensation flange 71 generates first elastic deformation towards the distal end of the elastic compensation bonnet mechanism 7; and when the primary seal 6 shrinks due to low temperature, the first elastic deformation is partially released, thereby compensating for the gap between the first elastic compensation flange 71 and the primary seal 6, so that the elastic compensation bonnet mechanism 7 remains sealed with the primary seal 6;

the proximal end of the elastic compensation bonnet means 7 is further provided with a second elastic compensation flange 72 extending inwards, when the assembly is completed, the outer surface of the second elastic compensation flange 72 abuts against the end face of the proximal end of the first connection pipe 13, and the second elastic compensation flange 72 is subjected to a second elastic deformation towards the proximal end of the elastic compensation bonnet means 7; and when the first connecting pipe 13 is shrunk due to low temperature, the second elastic deformation is partially released, so that the gap between the second elastic compensation flange 72 and the first connecting pipe 13 is compensated, and the elastic compensation bonnet mechanism 7 is kept sealed with the first connecting pipe 13.

Wherein the first elastic compensation flange 71 and the second elastic compensation flange 72 are both annular flanges. The first elastic compensating collar 71 and the second elastic compensating collar 72 are formed by machining a radially trapezoidal groove 73 in the inner circumference of the proximal end of the elastic compensating bonnet means 7, which provides a space for the deformation of the elastic compensating bonnet means 7 itself, in other words, the elastic compensating bonnet means 7 itself is also deformed by compression (the outer surface 711 of the first elastic compensating collar 71 is elastically deformed in the direction of the trapezoidal groove 73) under the influence of the reaction force when the outer end of the elastic compensating bonnet means applies pressure to the main seal 6 inside. When low-temperature medium passes through the interior of the invention, the main sealing element 6 slightly shrinks and deforms, at the moment, a tiny fit clearance can be formed between the main sealing element and the elastic compensation valve cap mechanism 7, and the outer surface 711 of the first elastic compensation flange releases pressure towards the main sealing element 6 under the action of the elasticity of the first elastic compensation flange, so that the fit clearance generated by the shrinkage of the main sealing element 6 is compensated, the close contact between the main sealing element 6 and the ball 3 is ensured, and the leakage cannot occur.

As shown in fig. 5 and 6, a first annular protrusion 75 is formed on the outer circumference (non-threaded) of the elastic compensating bonnet mechanism 7, and the first annular protrusion 75 is interference-fitted with the inner circumferential surface of the valve body 1 to perform a sealing function. Through accurate size calculation, the resistance that interference fit produced here can not influence the axial displacement between valve body and the elastic compensation valve cap mechanism 7, prevents the dead condition of card and appears.

As shown in fig. 3, the distal end of the elastic compensation bonnet mechanism 7 further comprises an outer annular flange 74 extending outward, when the elastic compensation bonnet mechanism 7 is assembled with the valve body 1, a third non-metallic sealing ring 8 is disposed between the outer annular flange 74 and the valve body 1, and the third non-metallic sealing ring is made of teflon. In other words, when the valve body 1 is matched with the elastic compensation valve cap mechanism 7, the third nonmetal sealing ring 8 is extruded and deformed, so that a matching gap is filled, and leakage between the valve body 1 and the elastic compensation valve cap mechanism 7 is effectively prevented.

(c) First outlet/second outlet connection

As shown in fig. 1 to 6, in the embodiment of the present invention, since the first and second outlet ports are in direct contact with the circulation medium, in order to prevent the low-temperature shrinkage deformation of the non-metal gasket (e.g., plastic gasket), a hard-sealed sealing structure is used at the first and second outlet ports. Due to design requirements, the connection modes of the first outlet end and the second outlet end are different, because a hole with a large drift diameter is processed on one side of the valve body 1 in order to put the ball body 3 into the valve body 1, and the elastic compensation valve cap mechanism 7 is connected with the hole (the first outlet end) (processed with threads); that is, one end of the valve body 1 is connected with the elastic compensation bonnet mechanism through a connecting pipe and a fastening nut, and the other end is directly connected with the valve body through the connecting pipe and the fastening nut. Specifically, the elastic compensation valve cap mechanism 7 is arranged at the first outlet end 11 of the valve body 1, and connects the first outlet end 11 with the first connecting pipe 13 by matching with the first outlet end fastening nut 15, wherein the outer side of the near end of the elastic compensation valve cap mechanism 7 is in threaded connection with the inner side of the first outlet end 11 of the valve body, and the inner side of the far end of the elastic compensation valve cap mechanism 7 is in threaded connection with the outer side of the first outlet end fastening nut 15; the second outlet end 12 is provided with a second connecting pipe 14 and a second outlet end fastening nut 16, and the second outlet end 12 is directly connected with the valve body 1 in a sealing manner through the second connecting pipe 14 and the second outlet end fastening nut 16.

And, a second metal gasket 18 is respectively arranged between the first connecting pipe 13 and the elastic compensation valve cap mechanism 7 and between the second connecting pipe 14 and the valve body 1, in this embodiment, the second metal gasket 18 is a brass gasket, then a second annular bulge 76 is designed on the end surface of the valve body 1 and the elastic compensation valve cap mechanism 7, which is contacted with the brass gasket, when the second annular bulge 76 is contacted with the brass gasket 18, the contact area is reduced, the pressure is correspondingly increased, and the leakage is effectively prevented. In other embodiments, the first and second outlet ports may be connected in the same manner. In addition, the same thread as the second outlet port can be machined at the rear end of the elastic compensating bonnet mechanism 7, so that the threads of the outlets at both ends (the first and second outlet ports) are the same, and then the same connecting pipe and fastening nut can be used.

In the present application, not only is the variety of outlet connection methods, but also the valve body does not need to be modified. The outlet end is composed of a connecting pipe and a fastening nut, the connecting pipe does not have the fastening function and is fixed through the fastening nut, and therefore the connecting pipe is replaceable. The tail end of the connecting pipe can be processed according to the requirements of customers, various connecting modes such as threads, flanges and welding are met, the connecting pipe is only required to be replaced, the production is convenient, and the cost can be saved.

In addition, the outlet connection position can be rotated, and the direction and the position of an external connecting pipeline can be conveniently adjusted. Because the external pipeline is connected with the outlet end connecting pipe of the invention, and the outlet end connecting pipe is fixed by the fastening nut, the connecting pipe can rotate freely only by loosening the fastening nut, if the external space is limited in the actual working condition, the pipeline cannot be arranged, the problem can be solved probably by the rotating direction, and the practical use is greatly facilitated.

(d) Setting of handle positioning block

As shown in fig. 7, in the present embodiment, the handle positioning block is located at the rear end of the handle, so that the occupation of the limited space is reduced. The positioning block of the handle of the ball valve is usually positioned at the front end, and the free rotation of the handle can be influenced in some working environments with narrow space.

All documents mentioned in this application are to be considered as being incorporated in their entirety into the disclosure of this application so as to be subject to modification as necessary. Further, it is understood that various changes or modifications may be made to the present application by those skilled in the art after reading the above disclosure of the present application, and such equivalents are also within the scope of the present application as claimed.

Claims (10)

1. A fluid ball valve, comprising: the valve comprises a valve body (1), a valve rod (2) and a ball body (3); the valve rod (2) is arranged in the valve body (1), and the lower end of the valve rod (2) is connected with the ball body (3); a first outlet end (11) and a second outlet end (12) are arranged on the valve body (1), and the first outlet end (11) and the second outlet end (12) are arranged on two opposite sides of the valve body (1);

a fastening nut (4) and a first sealing element (5) are arranged between the valve body (1) and the valve rod (2), wherein the first sealing element (5) comprises at least one first metal sealing ring (51) and at least one first non-metal sealing ring (52) which are arranged around the valve rod, and the first metal sealing ring (51) and the first non-metal sealing ring (52) are alternately arranged in the axial direction of the valve rod (2); and the fastening nut (4) and the first sealing member (6) are used for sealing and connecting the valve rod (2) to the valve body (1).

2. A ball valve according to claim 1, wherein a main seal (6) is provided between the inner surface of the valve body (1) and the outer surface of the ball body (3), the ball valve further comprising an elastic compensating bonnet means (7), the elastic compensating bonnet means (7) being provided at the first outlet end (11) of the valve body (1) and connecting the first outlet end (11) to the first connecting pipe (13) by cooperating with a first outlet end fastening nut (15);

the outer side of the near end of the elastic compensation valve cap mechanism (7) is in threaded connection with the inner side of a first outlet end (11) of the valve body (1), and the inner side of the far end of the elastic compensation valve cap mechanism (7) is in threaded connection with the outer side of a first outlet end fastening nut (15);

and the proximal end of the elastic compensation bonnet mechanism (7) is provided with a first elastic compensation flange (71) extending inwards, when the assembly is completed, the outer surface of the first elastic compensation flange (71) is abutted against the outer surface of the main sealing element (6), and the first elastic compensation flange (71) generates a first elastic deformation towards the distal end of the elastic compensation bonnet mechanism (7); and when the primary seal (6) shrinks due to low temperature, the first elastic deformation is partially released, so that the gap between the first elastic compensation flange (71) and the primary seal (6) is compensated, and the elastic compensation bonnet mechanism (7) is kept sealed with the primary seal (6).

3. The ball valve according to claim 2, characterized in that the proximal end of the elastically compensating bonnet means (7) is further provided with a second, inwardly extending, elastically compensating collar (72), the outer surface of which second, elastically compensating collar (72) abuts against the end surface of the proximal end of the first connecting tube (13) when the assembly is completed, and the second, elastically compensating collar (72) is subjected to a second elastic deformation towards the proximal end of the elastically compensating bonnet means (7); and when the first connecting pipe (13) is caused to shrink by the low temperature, the second elastic deformation is caused to be partially released, so that the gap between the second elastic compensation flange (72) and the first connecting pipe (13) is compensated, and the elastic compensation bonnet mechanism (7) is kept sealed with the first connecting pipe (13).

4. A ball valve according to claim 3, characterized in that a radially trapezoidal recess (73) is made in the inner circumference of the proximal end of said elastically compensating bonnet means (7) so as to form said first elastically compensating collar (71) and said second elastically compensating collar (72).

5. The ball valve according to claim 1, characterized in that the second outlet end (12) is connected in the same or different way as the first outlet end (11).

6. The ball valve according to claim 2, characterized in that the second outlet end (12) is connected in a different way than the first outlet end (11), and that the second outlet end (12) is provided with a second connection pipe (14) and a second outlet end fastening nut (16), and that the second outlet end (12) is directly and sealingly connected to the valve body (1) via the second connection pipe (14) and the second outlet end fastening nut (16).

7. The ball valve according to claim 6, characterized in that a second metal sealing ring (18) is provided between the first connecting pipe (13) and the elastically compensating bonnet means (7) and/or a second metal sealing ring (18) is provided between the second connecting pipe (14) and the valve body (1).

8. The ball valve according to claim 7, characterized in that a second annular protrusion (76) is provided on the close contact surface of the elastically compensating bonnet means (7) and/or the valve body (1) with the second metal sealing ring (18).

9. The ball valve according to claim 1, characterized in that the distal end of the elastically compensating bonnet means (7) comprises an outwardly extending outer annular flange (74), a third non-metallic sealing ring (8) being provided between the contact of the outer annular flange (74) with the valve body (1) when the elastically compensating bonnet means (7) is assembled with the valve body (1).

10. The ball valve according to claim 1, further comprising a handle (9) and a handle positioning block (91), wherein the handle positioning block (91) is provided at a rear end of the handle (9).

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