CN217977468U

CN217977468U - Ball valve and refrigerating system thereof

Info

Publication number: CN217977468U
Application number: CN202220659106.2U
Authority: CN
Inventors: 何锟; 寿周阳; 戴旖
Original assignee: Zhejiang Dunan Machinery Co Ltd
Current assignee: Zhejiang Dunan Machinery Co Ltd
Priority date: 2022-03-23
Filing date: 2022-03-23
Publication date: 2022-12-06
Anticipated expiration: 2032-03-23

Abstract

The utility model relates to a refrigerating system field especially relates to ball valve and refrigerating system thereof. A ball valve comprises a valve body, a valve rod and a valve ball, wherein the valve ball is arranged in the valve body, one end of the valve rod is positioned in the valve body and is connected with the valve ball, the other end of the valve rod extends out of the valve body, a first opening and a second opening are formed in the valve body, and the valve rod can drive the valve ball to rotate so as to isolate or communicate the first opening and the second opening; along the axial of valve rod, be equipped with first sealing washer and second sealing washer between valve rod and the valve body, first sealing washer with the material of second sealing washer is different, compares in prior art because the material of first sealing washer and second sealing washer is different, and the refrigerant type that both are suitable for is also different, has improved the suitability of ball valve to the refrigerant.

Description

Ball valve and refrigerating system thereof

Technical Field

The utility model relates to a refrigerating system field especially relates to ball valve and refrigerating system thereof.

Background

In a refrigeration system, a ball valve plays a crucial role in connection and disconnection of a pipeline, and generally, a ball valve with a circular channel is used as a connection and disconnection element of the pipeline, the ball valve is connected with a valve rod, and the ball valve realizes connection and disconnection actions along with rotation of the valve rod so as to isolate or open the pipeline. The ball valve has the advantages of small fluid resistance, simple structure, tightness, reliability, convenient operation, rapid opening and closing, wide application range and the like, and is widely applied.

The sealing ring is arranged on a valve rod of the existing ball valve and is matched with a valve body to improve the sealing performance of the ball valve, but the material of the sealing ring can only play a long-time sealing role for several refrigerants which are suitable for the material, and when the refrigerant type is changed, the sealing ring is easy to solve the problems that the service life is shortened and the sealing performance is reduced because the material is not suitable.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model provides a to above-mentioned technical problem, provide a ball valve, technical scheme as follows:

a ball valve comprises a valve body, a valve rod and a valve ball, wherein the valve ball is arranged in the valve body, one end of the valve rod is positioned in the valve body and is connected with the valve ball, the other end of the valve rod extends out of the valve body, a first opening and a second opening are formed in the valve body, and the valve rod can drive the valve ball to rotate so as to isolate or communicate the first opening and the second opening;

along the axial of valve rod, be equipped with first sealing washer and second sealing washer between valve rod and the valve body, first sealing washer with the material of second sealing washer is different.

So set up, the valve rod outside has double sealing to because the material of first sealing washer and second sealing washer is different, the refrigerant type that both were suitable for is also different, is not suitable for the refrigerant of circulation in the ball valve when first sealing washer, and when the second sealing washer was applicable to this refrigerant, the stability of sealed effect can be guaranteed to the second sealing washer. On the contrary, when the second sealing ring is not suitable for the refrigerant circulating in the ball valve and the first sealing ring is suitable for the refrigerant, the first sealing ring can ensure the stability of the sealing effect, thereby improving the applicability of the ball valve to the refrigerant.

In one embodiment, the outer side wall of the valve rod is provided with at least a first sealing ring and a second sealing ring along the axial direction of the valve rod, and the first sealing ring and the second sealing ring are respectively abutted with the inner wall of the valve body.

In one embodiment, the first seal ring and the second seal ring are made of neoprene or hydrogenated nitrile rubber.

In this way, the first sealing ring and the second sealing ring are different in applied refrigerants and can mutually fill the gap of the refrigerants which are not suitable for the first sealing ring and the second sealing ring, namely, the chloroprene rubber material is mainly applied to the refrigerant R22, and the refrigerants which are mainly applied to the hydrogenated nitrile rubber are R134a and R407C, R410A, R, so that the sealing ring made of the chloroprene rubber material can be applied when the refrigerant which flows through the ball valve is R22, and the sealing ring made of the hydrogenated nitrile rubber material can be applied when the refrigerant which flows through the ball valve is R134a and R407C, R410A, R.

In one embodiment, the first sealing ring is made of hydrogenated nitrile rubber, the second sealing ring is made of chloroprene rubber, and the first sealing ring is arranged close to the valve ball relative to the second sealing ring.

So set up, the first sealing washer that adopts the preparation of hydrogenation butadiene-acrylonitrile rubber can touch the refrigerant earlier, because it is wider than the refrigerant kind scope that the chloroprene rubber material can tolerate, has further promoted the ball valve to the refrigerant suitability.

In one embodiment, the outer side wall of the valve rod is provided with a first groove and a second groove which are arranged at intervals, the first sealing ring is arranged in the first groove, and the second sealing ring is arranged in the second groove; or, the inner wall of the valve body is provided with a first groove and a second groove which are arranged at intervals, the first sealing ring is arranged in the first groove, and the second sealing ring is arranged in the second groove.

So set up, first sealing washer and second sealing washer are spacing by first recess and second recess respectively for the structure is more firm stable, prevents that first sealing washer and second sealing washer from droing. The first groove and the second groove are arranged at intervals, so that a refrigerant buffer space can be created between the first sealing ring and the second sealing ring, and the sealing performance is further enhanced.

In one embodiment, the valve body comprises a valve seat and a valve cover, the valve seat and the valve cover are connected to form a valve cavity, and the valve ball is arranged in the valve cavity.

So set up, the valve body comprises disk seat and valve gap, is favorable to the assembly of the internal element of valve body, and it is also more convenient to the maintenance and the change of internal element in the later stage to the processing degree of difficulty of valve body in the manufacture process has been reduced.

In one embodiment, the valve seat is provided with the first opening, the first opening is connected with a first communicating pipe, the valve cover is provided with the second opening, and the second opening is connected with a second communicating pipe.

In one embodiment, the valve seat comprises a first section and a second section, the inner diameter of the first section is larger than that of the second section so as to form a first step, and one end of the first communication pipe close to the valve ball abuts against the first step;

the valve cover comprises a third section and a fourth section, the inner diameter of the fourth section is larger than that of the third section so as to form a second step, and one end, close to the valve ball, of the second communicating pipe is abutted to the second step.

So set up, first communicating pipe and second communicating pipe and valve body between be connected more firm, avoided first communicating pipe and/or second communicating pipe too stretch into the valve body in, influence valve body inner structure, interfere the work of ball valve.

In one embodiment, a third sealing ring and a fourth sealing ring are arranged in the valve cavity, the third sealing ring is located between the valve seat and the valve ball, and the fourth sealing ring is located between the valve cover and the valve ball.

So set up, can strengthen the sealing performance between valve ball and the valve body.

In one embodiment, one end of the valve rod, which is far away from the ball valve, is provided with a limit pin, one end of the valve body, which is close to the limit pin, is provided with a protrusion, and the limit pin can rotate along with the valve rod and is abutted against two ends of the protrusion.

So set up, the arch can backstop the spacer pin rotatory, guarantees that the rotation angle of valve ball is in appointed within range, avoids the valve ball to open the valve and leads to because of the spontaneous rotation of the flow of refrigerant, appears opening the valve not tight scheduling problem.

The utility model discloses still protect a refrigerating system, include as above the ball valve.

Compared with the prior art, the utility model provides a ball valve, through set up the different double-deck sealing washer of material in the valve rod outside, because the material of first sealing washer and second sealing washer is different, the refrigerant type that both are suitable for is also different, and when first sealing washer is not suitable for the refrigerant of circulation in the ball valve, and the second sealing washer is applicable to this refrigerant, the second sealing washer can guarantee the stability of sealed effect. On the contrary, when the second sealing ring is not suitable for the refrigerant circulating in the ball valve and the first sealing ring is suitable for the refrigerant, the first sealing ring can ensure the stability of the sealing effect, thereby improving the applicability of the ball valve to the refrigerant.

Drawings

Fig. 1 is a cross-sectional view of a ball valve provided by the present invention;

fig. 2 is an exploded view of the ball valve provided by the present invention.

The symbols in the drawings represent the following meanings:

100. a ball valve; 10. a valve body; 11. a first opening; 12. a second opening; 13. a valve cavity; 20. a valve stem; 21. a first groove; 211. a first seal ring; 22. a second groove; 221. a second seal ring; 23. an operation section; 24. a spacing pin; 25. a connecting portion; 26. a valve ball; 261. connecting holes; 262. a through hole; 27. a protrusion; 28. a boss; 29. a gasket; 30. a valve seat; 31. a first stage; 32. a second stage; 33. a first step; 34. a first communication pipe; 35. a third seal ring; 36. a third step; 40. a valve cover; 41. a third stage; 42. a fourth stage; 43. a second step; 44. a second communicating pipe; 45. a fourth seal ring; 46. and a fourth step.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a ball valve 100 is applied to refrigerating system, as the component of opening and close in the refrigerating system pipeline, plays important role to the break-make of pipeline.

To the technical problem, the utility model provides a ball valve 100, ball valve 100 include valve body 10, valve rod 20 and valve ball 26, and inside valve body 10 was located to valve ball 26, valve rod 20's one end was located valve body 10 and was connected with valve ball 26, and the other end stretches out valve body 10. The valve body 10 is provided with a first opening 11 and a second opening 12, and the valve rod 20 can drive the valve ball 26 to rotate so as to isolate or communicate the first opening 11 and the second opening 12.

At least a first seal ring 211 and a second seal ring 221 are provided between the valve stem 20 and the valve body 10 along the axial direction of the valve stem 20, and the first seal ring 211 and the second seal ring 221 are made of different materials. In this embodiment, two sealing rings are provided outside the valve stem 20, and in other embodiments, more than 2 sealing rings may be provided outside the valve stem 20.

Through set up the double-deck sealing washer of different materials in the valve rod 20 outside, because first sealing washer 211 is different with the material of second sealing washer 221, and the refrigerant type that both are suitable for also is different, and when first sealing washer 211 is not suitable for the refrigerant that circulates in ball valve 100, and second sealing washer 221 is suitable for this refrigerant, second sealing washer 221 can guarantee the stability of sealed effect. On the contrary, when the second sealing ring 221 is not suitable for the refrigerant flowing through the ball valve 100 and the first sealing ring 211 is suitable for the refrigerant, the first sealing ring 211 can ensure the stability of the sealing effect, thereby improving the applicability of the ball valve 100 to the refrigerant.

Further, the first seal ring 211 and the second seal ring 221 are in direct contact with the inner wall of the valve body 10, and the sealing performance between the two can be improved.

In other embodiments, a rib structure may be additionally disposed on the inner wall of the valve body 10, and the first sealing ring 211 and the second sealing ring 221 abut against the rib structure, which may also achieve a sealing effect. The engagement between the first and second sealing rings 211 and 221 and the valve body 10 is not limited to the engagement with the inner wall of the valve body 10 in the embodiment.

First recess 21 and second recess 22 have been seted up to the lateral wall of valve rod 20, are equipped with first sealing washer 211 in the first recess 21, are equipped with second sealing washer 221 in the second recess 22, and it is fixed spacing with first sealing washer 211 and second sealing washer 221 through first recess 21 and second recess 22, prevent that first sealing washer 211 and second sealing washer 221 from droing. Of course, the first groove 21 and the second groove 22 may also be disposed on the inner wall of the valve body 10, and the position relationship between the first groove 21 and the second groove 22 is not limited to the outer side wall of the valve rod 20 in this embodiment, and only needs to satisfy the sealing effect.

The first groove 21 and the second groove 22 are spaced apart from each other, so that a buffer space for the refrigerant is created between the first sealing ring 211 and the second sealing ring 221, thereby further enhancing the sealing performance.

Specifically, the first sealing ring 211 and the second sealing ring 221 are made of neoprene or hydrogenated nitrile rubber, so that the first sealing ring 211 and the second sealing ring 221 are applicable to different refrigerants, and the gaps of the refrigerants that are not applicable to each other can be filled up. The neoprene rubber material is mainly used for the refrigerant R22, and the hydrogenated nitrile rubber is mainly used for the refrigerants R134a and R407C, R32410A, R, so that the gasket made of neoprene rubber can be used when the refrigerant flowing through the ball valve 100 is R22, and the gasket made of hydrogenated nitrile rubber can be used when the refrigerant flowing through the ball valve 100 is R134a or R407C, R32410A, R.

Further, the first seal ring 211 is made of hydrogenated nitrile rubber, the second seal ring 221 is made of chloroprene rubber, and the first seal ring 211 is disposed close to the valve ball 26 with respect to the second seal ring 221. So set up, the first sealing washer 211 that adopts the preparation of hydrogenated nitrile rubber can contact the refrigerant earlier, because it is wider than the refrigerant scope that the chloroprene rubber material can tolerate, has further promoted ball valve 100's refrigerant suitability.

The end of the valve rod 20 close to the valve ball 26 is provided with a connecting part 25, one side of the valve ball 26 facing the valve rod 20 is provided with a connecting hole 261, the connecting part 25 is matched with the connecting hole 261 in shape, the connecting part 25 is fixedly connected with the connecting hole 261, and in order to increase the stability of connection between the valve ball 26 and the connecting part 25, the connecting part 25 is preferably of a non-cylindrical structure. When the valve rod 20 rotates, the valve ball 26 is driven to rotate through the matching of the connecting part 25 and the connecting hole 261, the through hole 262 is formed in the valve ball 26, and the first opening 11 and the second opening 12 can be communicated or separated through the through hole 262, so that the pipeline of the ball valve 100 can be switched on or off.

Specifically, the connecting portion 25 is in a convex shape, and the connecting portion 25 is inserted into the connecting hole 261 and is clamped with the connecting hole 261 to realize the fixed connection of the two.

The end of the valve rod 20 far away from the valve ball 26 is provided with an operating part 23, and the operating part 23 extends out of the valve body 10. In the working process of the ball valve 100, when the valve ball 26 needs to rotate to realize the action of opening or closing the valve, the operation part 23 is screwed, the operation part 23 drives the valve rod 20 to rotate, and then the connection part 25 and the valve ball 26 are driven to rotate, so that the on-off of the pipeline is realized.

The outer wall of the valve rod 20 is provided with a boss 28, the boss 28 is provided with a gasket 29, and the gasket 29 is positioned between the boss 28 and the valve body 10, so that the abrasion between the valve rod 20 and the inner wall of the valve body 10 can be reduced, and the sealing effect of the ball valve 100 can be enhanced.

Preferably, the gasket 29 is made of polytetrafluoroethylene, so that the gasket has good wear resistance and stable chemical properties. In other embodiments, the washer 29 may be made of other wear-resistant materials, such as hard plastic.

The valve body 10 includes a valve seat 30 and a valve cover 40, wherein one side of the valve seat 30 has an opening, the valve cover 40 covers the opening of the valve seat 30 and is connected with the valve seat 30 to form a valve cavity 13, the valve ball 26 is disposed inside the valve cavity 13, the first opening 11 is disposed on the valve seat 30, and the second opening 12 is disposed on the valve cover 40. The valve body 10 consists of the valve seat 30 and the valve cover 40, which is beneficial to the assembly of the internal elements of the valve body 10, is more convenient to maintain and replace the internal elements at the later stage, and reduces the processing difficulty of the valve body 10 in the manufacturing process.

A third sealing ring 35 and a fourth sealing ring 45 are arranged in the valve cavity 13, the third sealing ring 35 is positioned between the valve seat 30 and the valve ball 26, and the fourth sealing ring 45 is positioned between the valve cover 40 and the valve ball 26, so that the sealing performance between the valve ball 26 and the valve body 10 is improved.

The inner wall of valve holder 30 is equipped with third step 36, and the inner wall of valve gap 40 is equipped with fourth step 46, and third sealing washer 35 butt in third step 36, and fourth sealing washer 45 butt in fourth step 46, and third step 36 and fourth step 46 play limiting displacement to third sealing washer 35 and fourth sealing washer 45 respectively.

Further, the valve seat 30 and the valve cover 40 are fastened by welding after being screwed.

It will be appreciated that in other embodiments, the valve seat 30 and valve cover 40 may be connected by threads only or by welding only to reduce manufacturing costs. The valve body 10 may also be integrally formed directly within the valve cavity 13 to improve the integrity and consistency of the device.

The valve seat 30 is still equipped with protruding 27 on the one side of keeping away from the valve ball 26, wears to be equipped with the spacer pin 24 on the operating portion 23, and the spacer pin 24 can with protruding 27 butt, protruding 27 can spacing spacer pin 24, promptly, protruding 27 can backstop the rotation of spacer pin 24, guarantees that the rotation angle of valve ball 26 is in appointed within range, avoids ball valve 100 because of the spontaneous rotation of the flow of refrigerant, appears opening the valve and is not passed through, closes the not tight scheduling problem of valve.

First opening 11 is seted up on valve seat 30, valve seat 30 includes first section 31 and second section 32, the internal diameter of first section 31 is greater than the internal diameter of second section 32, thereby form first step 33, first opening 11 is connected with first communication pipe 34, first communication pipe 34 is close to the one end and the first step 33 butt of valve ball 26, in order to improve first communication pipe 34 and valve seat 30's connection steadiness, and fix a position the connection of first communication pipe 34 and valve seat 30 and avoid first communication pipe 34 excessively to stretch into valve body 10, influence valve body 10 inner structure, interfere the work of ball valve 100.

The second opening 12 is opened in the valve cover 40, the valve cover 40 includes a third section 41 and a fourth section 42, the inner diameter of the third section 41 is greater than the inner diameter of the fourth section 42, so as to form a second step 43, one end of the second communication pipe 44 close to the valve ball 26 abuts against the second step 43, so as to improve the connection stability of the second communication pipe 44 and the valve cover 40, and the connection between the second communication pipe 44 and the valve cover 40 is positioned, so that the second communication pipe 44 is prevented from excessively extending into the valve body 10, the internal structure of the valve body 10 is prevented from being affected, and the work of the ball valve 100 is prevented from being interfered.

The first communication pipe 34, the first opening 11, the through hole of the valve ball 26, the second opening 12, and the second communication pipe 44 can collectively form a passage for circulation of refrigerant.

The utility model also provides a refrigerating system, including foretell ball valve 100.

Compared with the prior art, the utility model provides a ball valve 100, through set up the different double-deck sealing washer of material in the valve rod 20 outside, because first sealing washer 211 and second sealing washer 221's material is different, and both suitable refrigerant types are also different, are not suitable for the refrigerant of circulation in the ball valve 100 when first sealing washer 211, and when second sealing washer 221 was applicable to this refrigerant, the stability of sealed effect can be guaranteed to second sealing washer 221. On the contrary, when the second sealing ring 221 is not suitable for the refrigerant flowing through the ball valve 100 and the first sealing ring 211 is suitable for the refrigerant, the first sealing ring 211 can ensure the stability of the sealing effect, thereby improving the applicability of the ball valve 100 to the refrigerant.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A ball valve comprises a valve body (10), a valve rod (20) and a valve ball (26), wherein the valve ball (26) is arranged inside the valve body (10), one end of the valve rod (20) is positioned in the valve body (10) and connected with the valve ball (26), the other end of the valve rod extends out of the valve body (10), a first opening (11) and a second opening (12) are formed in the valve body (10), and the valve rod (20) can drive the valve ball (26) to rotate so as to isolate or communicate the first opening (11) and the second opening (12);

the valve is characterized in that at least a first sealing ring (211) and a second sealing ring (221) are arranged between the valve rod (20) and the valve body (10) along the axial direction of the valve rod (20), the first sealing ring (211) is made of hydrogenated nitrile rubber, and the second sealing ring (221) is made of chloroprene rubber; or the first sealing ring (211) is made of chloroprene rubber, and the second sealing ring (221) is made of hydrogenated butadiene-acrylonitrile rubber.

2. The ball valve according to claim 1, characterized in that, along the axial direction of the valve rod (20), the outer side wall of the valve rod (20) is provided with at least a first sealing ring (211) and a second sealing ring (221), and the first sealing ring (211) and the second sealing ring (221) are respectively abutted with the inner wall of the valve body (10).

3. The ball valve according to claim 1, wherein the outer side wall of the valve rod (20) is provided with a first groove (21) and a second groove (22) which are arranged at intervals, the first sealing ring (211) is arranged in the first groove (21), and the second sealing ring (221) is arranged in the second groove (22);

or, the inner wall of the valve body (10) is provided with a first groove (21) and a second groove (22) which are arranged at intervals, the first sealing ring (211) is arranged in the first groove (21), and the second sealing ring (221) is arranged in the second groove (22).

4. The ball valve according to claim 1, characterized in that the valve body (10) comprises a valve seat (30) and a valve cover (40), the valve seat (30) and the valve cover (40) being connected to form a valve chamber (13), the valve ball (26) being arranged in the valve chamber (13).

5. The ball valve according to claim 4, wherein the valve seat (30) is opened with the first opening (11), the first opening (11) is connected with a first communication pipe (34), the valve cover (40) is opened with the second opening (12), and the second opening (12) is connected with a second communication pipe (44).

6. The ball valve according to claim 5, characterized in that the valve seat (30) comprises a first section (31) and a second section (32), the first section (31) having an inner diameter greater than the inner diameter of the second section (32) so as to form a first step (33), the first communication duct (34) abutting the first step (33) near one end of the valve ball (26);

the valve cover (40) comprises a third section (41) and a fourth section (42), the inner diameter of the fourth section (42) is larger than that of the third section (41) to form a second step (43), and one end, close to the valve ball (26), of the second communication pipe (44) is abutted to the second step (43).

7. The ball valve according to claim 4, characterized in that a third sealing ring (35) and a fourth sealing ring (45) are arranged in the valve cavity (13), the third sealing ring (35) is positioned between the valve seat (30) and the valve ball (26), and the fourth sealing ring (45) is positioned between the valve cover (40) and the valve ball (26).

8. The ball valve according to claim 1, characterized in that the end of the valve stem (20) remote from the ball valve is provided with a limit pin (24), the end of the valve body (10) close to the limit pin (24) is provided with a projection (27), and the limit pin (24) can rotate along with the valve stem (20) and abuts against the projection (27).

9. A refrigeration system comprising a ball valve according to claims 1-8.