CN218330452U

CN218330452U - Detection device for detecting sealing performance of ball valve

Info

Publication number: CN218330452U
Application number: CN202222774210.9U
Authority: CN
Inventors: 赵海燕; 盖玉龙; 刘晓军; 刘成钢; 乔国亚
Original assignee: Beijing Aerospace Long March Machinery Equipment Manufacturing Co ltd; Changzheng Engineering Co Ltd
Current assignee: Beijing Aerospace Long March Machinery Equipment Manufacturing Co ltd; Changzheng Engineering Co Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2023-01-17
Anticipated expiration: 2032-10-20

Abstract

The utility model provides a detection apparatus for be used for detecting ball valve leakproofness, detection apparatus include base, connecting axle and centre gripping subassembly. At least two opposite vertical plates are arranged on the base. The connecting shaft is arranged on the two vertical plates in a rotatable mode. The clamping assembly comprises a supporting assembly, an outlet pressing plate and an inlet pressing plate, the outlet pressing plate, an outlet valve seat and an outlet sealing surface are arranged in a surrounding mode to form a first detection cavity, the inlet pressing plate, an inlet valve seat and an inlet sealing surface are arranged in a surrounding mode to form a second detection cavity, the outlet pressing plate is provided with a first detection port communicated with the first detection cavity, the inlet pressing plate is provided with a second detection port communicated with the second detection cavity, liquid leakage detection is conducted on liquid supply to the first detection cavity through the first detection port, and liquid leakage detection is conducted on liquid supply to the second detection cavity through the second detection port. Above-mentioned detection device can detect the leakproofness between spheroid and the disk seat fast, and detects the accuracy height, has guaranteed the leakproofness and the security of ball valve.

Description

Detection device for detecting sealing performance of ball valve

Technical Field

The utility model relates to a leakproofness detects technical field, especially relates to a detection device for detecting ball valve leakproofness.

Background

The ball valve is one of valves, and is widely applied to conducting or intercepting conveying media of a pipeline, and the medium conveyed in the pipeline is usually gas or liquid, so that the requirement on the sealing performance of the ball valve is high, and particularly the ball valve has no external leakage or internal leakage in the use process. To the interior hourglass problem when the valve is in the closed condition, no check out test set can detect this at present, and the unable detection of interior hourglass problem probably influences the pipeline transportation safety to influence valve low reaches operating personnel's safety.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned technical problem that exists among the prior art, the utility model provides a detection device for detecting ball valve leakproofness, it can detect the leakproofness between spheroid and the disk seat fast, and detects the accuracy height, has guaranteed the leakproofness and the security of ball valve.

The embodiment of the utility model provides a detection device for detecting ball valve leakproofness, the ball valve includes that import disk seat, export disk seat and rotation locate the spheroid between the two, the spheroid has and is used for the shutoff the sealed face of import disk seat and be used for the shutoff the sealed face of export disk seat, detection device includes:

the base is at least provided with two opposite vertical plates;

the connecting shaft is arranged on the two vertical plates in a rotatable mode;

the clamping assembly comprises a supporting assembly arranged on the connecting shaft in a sleeved mode, an outlet pressing plate and an inlet pressing plate, wherein the outlet pressing plate and the inlet pressing plate are located on two opposite sides of the supporting assembly respectively, the outlet pressing plate and the supporting assembly are matched and clamped with the outlet valve seat, the outlet pressing plate, the outlet valve seat and the outlet sealing surface are arranged in a surrounding mode to form a first detection cavity, the inlet pressing plate and the supporting assembly are matched and clamped with the inlet valve seat, the inlet pressing plate, the inlet valve seat and the inlet sealing surface are arranged in a surrounding mode to form a second detection cavity, the outlet pressing plate is provided with a first detection port communicated with the first detection cavity, the inlet pressing plate is provided with a second detection port communicated with the second detection cavity, and the first detection port supplies liquid to the first detection cavity to perform liquid leakage detection, and the second detection port supplies liquid to the second detection cavity to perform liquid leakage detection.

In some embodiments, a limiting portion is formed at least one end of the connecting shaft, and a limiting groove is formed on the vertical plate corresponding to the limiting portion, so that when the connecting shaft rotates until the limiting portion is embedded in the limiting groove, the connecting shaft is limited to rotate.

In some embodiments, the two vertical plates are slidably disposed on the base along a direction parallel to the connecting shaft.

In some embodiments, the supporting assembly includes a first supporting plate, a second supporting plate, and an expansion sleeve sleeved outside the first supporting plate and the second supporting plate, the first supporting plate is fixedly sleeved on the connecting shaft, the second supporting plate is slidably sleeved on the connecting shaft, and when the second supporting plate slides in a direction of the first supporting plate, the expansion sleeve expands and deforms outwards under the extrusion of the second supporting plate, so as to tension the outlet valve seat between the outlet pressing plate and the supporting assembly, and tension the inlet valve seat between the inlet pressing plate and the supporting assembly.

In some embodiments, the second support plate is provided with a threaded hole, the connecting shaft is provided with an external thread corresponding to the portion of the second support plate, and the second support plate is screwed to the connecting shaft through the threaded hole.

In some embodiments, the outlet pressure plate and the inlet pressure plate are both provided with exhaust ports to exhaust gas in the first detection chamber and the second detection chamber when the liquid enters the two detection chambers respectively.

In some embodiments, the surface of the outlet pressing plate is parallel to the surface of the inlet pressing plate, and the outlet pressing plate and the inlet pressing plate are detachably connected.

In some embodiments, the opposite surfaces of the inlet pressure plate and the outlet pressure plate are both formed with an annular groove, and a sealing ring is arranged in the annular groove, so that the inlet valve seat is in sealing connection with the inlet pressure plate and the outlet valve seat is in sealing connection with the outlet pressure plate.

In some embodiments, the first support plate is formed with a first annular inclined surface on the outer periphery thereof, the second support plate is formed with a second annular inclined surface on the outer periphery thereof, and the expansion sleeve is formed with a third annular inclined surface on the outer periphery of opposite ends thereof, which are abutted against the first annular inclined surface and the second annular inclined surface, respectively.

In some embodiments, only one end of the connecting shaft is formed with the limiting part, the cross section of the end is rectangular, and the cross section of the other end is circular.

Compared with the prior art, the utility model discloses beneficial effect lies in: the utility model discloses a first detection mouth on the export clamp plate supplies liquid for first detection chamber to and the second on the import clamp plate detects the mouth and supplies liquid for the second detection chamber, realizes the leakproofness between the export disk seat and the export seal face of short-term test ball valve, and the leakproofness between import disk seat and the import seal face, and above-mentioned detection mode easy operation, it is higher to detect the accuracy, has guaranteed the leakproofness and the security of ball valve.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments generally by way of example, and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

Fig. 1 is a cross-sectional view of a detection device for detecting the sealing performance of a ball valve according to an embodiment of the present invention, wherein a detection object shown in the figure is a first detection chamber;

fig. 2 is a cross-sectional view of a detection device for detecting the sealing performance of a ball valve according to an embodiment of the present invention, wherein a detection object shown in the figure is a second detection chamber;

fig. 3 is a left side view of a detection device for detecting the sealing performance of a ball valve according to an embodiment of the present invention;

fig. 4 is a right side view of the detection device for detecting the sealing performance of the ball valve according to the embodiment of the present invention.

The members denoted by reference numerals in the drawings:

1-a ball valve; 11-inlet valve seat; 12-outlet valve seat; 13-sphere; 14-inlet sealing face; 15-outlet sealing surface; 2-a base; 3, erecting a plate; 31-a limiting groove; 4-connecting the shaft; 41-a limiting part; 5-a clamping assembly; 51-an outlet platen; 52-inlet platen; 53-first detection port; 54-a second detection port; 55-exhaust port; 6-a support assembly; 61-a first support plate; 62-a second support plate; 63-expanding the sleeve; 7-a first detection chamber; 8-a second detection chamber; 9-sealing ring.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and the detailed description. The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and specific embodiments, but not to be construed as limiting the invention.

The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word comprises the element listed after the word, and does not exclude the possibility that other elements may also be included. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present invention, when it is described that a specific device is located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

The embodiment of the utility model provides a detection device for detecting ball valve leakproofness, as shown in fig. 1 and fig. 2, ball valve 1 includes import disk seat 11, export disk seat 12 and rotates and locates spheroid 13 between the two. The ball 13 has an inlet sealing surface 14 for closing off the inlet valve seat 11 and an outlet sealing surface 15 for closing off the outlet valve seat 12. The position where the inlet valve seat 11 and the outlet valve seat 12 are communicated with each other in the open state of the ball valve 1, so that water can enter through the inlet valve seat 11 and water can exit through the outlet valve seat 12; in the closed state of the ball valve 1, the inlet sealing surface 14 blocks the position of the inlet valve seat 11 and the outlet sealing surface 15 blocks the position of the outlet valve seat 12, so that the inlet valve seat 11 and the outlet valve seat 12 cannot be communicated. It should be noted that the detection device of the present application detects the sealing performance between the inlet sealing surface 14 and the inlet valve seat 11 and the sealing performance between the outlet sealing surface 15 and the outlet valve seat 12 when the ball valve 1 is in the closed state.

Further, as shown in fig. 1 and 2, the detecting device includes a base 2, a connecting shaft 4, and a clamping assembly 5. The base 2 is at least provided with two opposite vertical plates 3. The connecting shaft 4 is rotatably arranged on the two vertical plates 3. The clamping assembly 5 comprises a supporting assembly 6 sleeved on the connecting shaft 4, and an outlet pressure plate 51 and an inlet pressure plate 52 which are respectively located on two opposite sides of the supporting assembly 6, the outlet pressure plate 51 and the supporting assembly 6 are matched with the clamping outlet valve seat 12, the outlet pressure plate 51, the outlet valve seat 12 and the outlet sealing surface 15 are arranged in a surrounding mode to form a first detection cavity 7, the inlet pressure plate 52 and the supporting assembly 6 are matched with the clamping inlet valve seat 11, and the inlet pressure plate 52, the inlet valve seat 11 and the inlet sealing surface 14 are arranged in a surrounding mode to form a second detection cavity 8. The outlet pressure plate 51 has a first detection port 53 communicating with the first detection chamber 7, and the inlet pressure plate 52 has a second detection port 54 communicating with the second detection chamber 8, so as to supply liquid to the first detection chamber 7 via the first detection port 53 for leak detection, and supply liquid to the second detection chamber 8 via the second detection port 54 for leak detection.

Fig. 1 is a schematic diagram illustrating the sealing performance of the first detection chamber 7 surrounded by the outlet pressure plate 51, the outlet valve seat 12, and the outlet sealing surface 15, fig. 2 is a schematic diagram illustrating the sealing performance of the second detection chamber 8 surrounded by the inlet pressure plate 52, the inlet valve seat 11, and the inlet sealing surface 14, and the directions of arrows shown in fig. 1 and 2 are both the flow directions of the detection medium.

As shown in fig. 1, when the connecting shaft 4 is rotated to position the inlet platen 52 above the outlet platen 51, a detection medium for detecting leakage or not can be supplied to the first detection port 53 of the outlet platen 51 located below, and the detection medium enters the first detection chamber 7 through the first detection port 53. If the sealing performance between the outlet valve seat 12 and the outlet sealing surface 15 of the ball valve 1 is good, the first detection cavity 7 is a sealed detection cavity, and the detection medium in the first detection cavity 7 cannot leak outwards; if the leakproofness is relatively poor between the export valve seat 12 of ball valve 1 and the export sealed face 15, then first detection chamber 7 is not sealed detection chamber, and the detection medium in the first detection chamber 7 of this moment will leak outward, and whether the first detection chamber 7 of user's accessible visual observation confirms the weeping condition exists to the problem of the leakproofness between quick judgement export valve seat 12 and the export sealed face 15.

As shown in fig. 2, when the connecting shaft 4 is rotated to position the outlet pressing plate 51 above the inlet pressing plate 52, a detection medium for detecting leakage or not can be supplied to the second detection port 54 of the inlet pressing plate 52 located below, and the detection medium enters the second detection chamber 8 through the second detection port 54. If the sealing performance between the inlet valve seat 11 and the inlet sealing surface 14 of the ball valve 1 is good, the second detection cavity 8 is a sealed detection cavity, and the detection medium in the second detection cavity 8 cannot leak outwards; if the leakproofness is relatively poor between the import disk seat 11 of ball valve 1 and the sealed face 14 of import, then the second detects the chamber 8 and is not sealed detection chamber, and the second detects the detection medium in the chamber 8 and will leak outward this moment, and user's accessible visual observation confirms whether the second detects the chamber 8 and has the weeping condition to the problem of the leakproofness between the quick judgement import disk seat 11 and the sealed face 14 of import.

Specifically, the connecting shaft 4 can be limited and positioned under the action of the two vertical plates 3 after rotating to a preset angle, so that the connecting shaft 4 cannot rotate any more. The predetermined angle is related to the relative positions of the inlet pressing plate 52 and the outlet pressing plate 51, and when the inlet pressing plate 52 and the outlet pressing plate 51 are in the up-down opposite positional relationship, the predetermined angle is defined to be reached, that is, the rotation of the connecting shaft 4 is to bring the inlet pressing plate 52 and the outlet pressing plate 51 into the up-down opposite positional relationship.

The utility model discloses a first detection mouth 53 on the export clamp plate 51 supplies liquid for first detection chamber 7 to and the second on the import clamp plate 52 detects mouth 54 and detects the chamber 8 for the second and supply liquid, realizes the leakproofness between the export disk seat 12 of short-term test ball valve 1 and the sealed face 15 of export, and the leakproofness between import disk seat 11 and the sealed face 14 of import, and above-mentioned detection mode easy operation, it is higher to detect the accuracy, has guaranteed the leakproofness and the security of ball valve 1.

In some embodiments, as shown in fig. 1 to 3, at least one end of the connecting shaft 4 is formed with a stopper portion 41, and a stopper groove 31 is formed on the upright plate 3 corresponding to the stopper portion 41 to limit the rotation of the connecting shaft 4 when the connecting shaft 4 rotates until the stopper portion 41 is inserted into the stopper groove 31.

Specifically, the limiting portion 41 may have a rectangular shape, a trapezoidal shape, or the like, and the shape of the limiting groove 31 is adapted to the shape of the limiting portion 41, so that the connecting shaft 4 cannot rotate after the limiting portion 41 is inserted into the limiting groove 31.

In some embodiments, both risers 3 are slidably arranged on base 2 in a direction parallel to connecting axis 4.

Specifically, a slide way can be formed on the base 2, and a slide block can be arranged at the bottom of the vertical plate 3 and can move linearly along the slide way. And above-mentioned slide can be equipped with a plurality of first mounting holes along its length direction, can correspond on the slider and be equipped with the second mounting hole, and connecting pieces such as bolt can wear to establish second mounting hole and a plurality of first mounting hole with the slider location on the slide.

Specifically, the shape of the slide way can be a convex shape.

In some embodiments, as shown in fig. 1 and 2, the supporting member 6 includes a first supporting plate 61, a second supporting plate 62, and an expanding sleeve 63 sleeved outside the first supporting plate 61 and the second supporting plate 62, the first supporting plate 61 is fixedly sleeved on the connecting shaft 4, the second supporting plate 62 is slidably sleeved on the connecting shaft 4, when the second supporting plate 62 slides toward the first supporting plate 61, the expanding sleeve 63 expands and deforms outwardly under the pressing action of the second supporting plate 62 to tension the outlet valve seat 12 between the outlet pressing plate 51 and the supporting member 6, and tension the inlet valve seat 11 between the inlet pressing plate 52 and the supporting member 6.

Specifically, the expansion sleeve 63 can be understood as a member whose two ends can be expanded outwards by pressing force, and the outer wall of the expansion sleeve 63 can abut against the flow passage of the ball 13.

Specifically, a step portion may be formed on the connecting shaft 4, and the first support plate 61 is clamped on the step portion, so that the first support plate 61 is limited on the connecting shaft 4.

In some embodiments, the second support plate 62 is provided with a threaded hole, a portion of the connecting shaft 4 corresponding to the second support plate 62 is externally threaded, and the second support plate 62 is threadedly connected to the connecting shaft 4 through the threaded hole. The connection of the connecting shaft 4 and the second support plate 62 is stable.

In some embodiments, as shown in fig. 1 and 2, the outlet pressure plate 51 and the inlet pressure plate 52 are provided with exhaust ports 55 to exhaust gas from the first detection chamber 7 and the second detection chamber 8 when liquid enters the two chambers, respectively.

Specifically, the exhaust port 55 may be configured as a one-way exhaust structure, and external air does not enter the detection chamber through the exhaust port 55. The detection medium in the first detection chamber 7 and the second detection chamber 8 is not discharged through the exhaust port 55.

In some embodiments, as shown in FIGS. 1 and 2, the exit platen 51 is positioned on a plane parallel to the plane of the entrance platen 52, and the exit platen 51 and the entrance platen 52 are removably connected.

Specifically, the outlet pressure plate 51 and the inlet pressure plate 52 may be rectangular, four corners of the outlet pressure plate and the inlet pressure plate may be connected by four sets of bolts to achieve the detachable connection, and the ball valve 1 located between the outlet pressure plate 51 and the inlet pressure plate 52 may be further compressed by fastening nuts of the bolts.

In some embodiments, as shown in fig. 1 and 2, the opposite surfaces of the inlet pressure plate 52 and the outlet pressure plate 51 are formed with annular grooves, and the sealing rings 9 are disposed in the annular grooves, so that the inlet valve seats 11 are connected with the inlet pressure plate 52 in a sealing manner and the outlet valve seats 12 are connected with the outlet pressure plate 51 in a sealing manner.

In some embodiments, as shown in fig. 1 and 2, the first support plate 61 is formed with a first annular inclined surface on the outer periphery thereof, the second support plate 62 is formed with a second annular inclined surface on the outer periphery thereof, and the expansion sleeve 63 is formed with a third annular inclined surface on the outer periphery of opposite ends thereof, which are abutted against the first annular inclined surface and the second annular inclined surface, respectively.

Specifically, the first annular inclined surface and the second annular inclined surface cooperate to form an outwardly expanded flare, and the expansion sleeve 63 is disposed at the flare.

In some embodiments, as shown in fig. 1 to 4, only one end of the connecting shaft 4 is formed with a stopper 41, and the cross-sectional shape of the end is rectangular and the cross-sectional shape of the other end is circular.

Specifically, one end of the connecting shaft 4, which is provided with the limiting portion 41, is a first end, the other end is a second end, a semicircular hole is formed in the vertical plate 3 corresponding to the second end of the connecting shaft 4, and the second end is partially embedded in the semicircular hole.

Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or variations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. Additionally, in the foregoing detailed description, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a non-claimed disclosed feature is essential to any claim. Rather, the inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention can be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.

Claims

1. A testing apparatus for testing the sealing performance of a ball valve, the ball valve including an inlet valve seat, an outlet valve seat and a ball rotatably disposed therebetween, the ball having an inlet sealing surface for sealing off the inlet valve seat and an outlet sealing surface for sealing off the outlet valve seat, the testing apparatus comprising:

the base is at least provided with two opposite vertical plates;

the clamping assembly comprises a supporting assembly sleeved on the connecting shaft, and an outlet pressing plate and an inlet pressing plate which are respectively located on two opposite sides of the supporting assembly, wherein the outlet pressing plate and the supporting assembly are matched and clamped with the outlet valve seat, the outlet pressing plate, the outlet valve seat and the outlet sealing surface are arranged in a surrounding mode to form a first detection cavity, the inlet pressing plate and the supporting assembly are matched and clamped with the inlet valve seat, the inlet pressing plate, the inlet valve seat and the inlet sealing surface are arranged in a surrounding mode to form a second detection cavity, the outlet pressing plate is provided with a first detection port communicated with the first detection cavity, the inlet pressing plate is provided with a second detection port communicated with the second detection cavity, and the first detection port supplies liquid to the first detection cavity to perform liquid leakage detection, and the second detection port supplies liquid to the second detection cavity to perform liquid leakage detection.

2. The apparatus of claim 1, wherein a stopper is formed at least one end of the connection shaft, and a stopper groove is formed on the vertical plate corresponding to the stopper to limit the rotation of the connection shaft when the connection shaft rotates until the stopper is fitted into the stopper groove.

3. A test device for testing the tightness of a ball valve according to claim 1, characterized in that said two vertical plates are each slidably provided on said base in a direction parallel to said connection shaft.

4. The detecting device for detecting the tightness of a ball valve according to claim 1, wherein the supporting assembly includes a first supporting plate, a second supporting plate, and an expanding sleeve sleeved outside the first supporting plate and the second supporting plate, the first supporting plate is fixedly sleeved on the connecting shaft, the second supporting plate is slidably sleeved on the connecting shaft, when the second supporting plate slides toward the first supporting plate, the expanding sleeve expands and deforms outwards under the squeezing action of the second supporting plate, so as to tension the outlet valve seat between the outlet pressing plate and the supporting assembly, and tension the inlet valve seat between the inlet pressing plate and the supporting assembly.

5. The detecting device for detecting the tightness of a ball valve according to claim 4, wherein the second supporting plate is provided with a threaded hole, the connecting shaft is provided with an external thread corresponding to the portion of the second supporting plate, and the second supporting plate is screwed on the connecting shaft through the threaded hole.

6. The apparatus of claim 1, wherein the outlet pressure plate and the inlet pressure plate are respectively provided with an exhaust port for exhausting gas from the first detection chamber and the second detection chamber when the first detection chamber and the second detection chamber are filled with liquid.

7. The detecting device for detecting the tightness of a ball valve according to claim 1, wherein a plate surface of the outlet pressing plate is parallel to a plate surface of the inlet pressing plate, and the outlet pressing plate and the inlet pressing plate are detachably connected.

8. The detecting device for detecting the tightness of the ball valve according to claim 1, wherein the opposite surfaces of the inlet pressure plate and the outlet pressure plate are both formed with an annular groove, and a sealing ring is arranged in the annular groove, so that the inlet valve seat is connected with the inlet pressure plate in a sealing manner and the outlet valve seat is connected with the outlet pressure plate in a sealing manner.

9. The apparatus as claimed in claim 4, wherein a first annular slope is formed on an outer periphery of the first support plate, a second annular slope is formed on an outer periphery of the second support plate, and third annular slopes abutting against the first annular slope and the second annular slope are respectively formed on outer peripheries of opposite ends of the expansion sleeve.

10. The apparatus of claim 2, wherein the stopper is formed at only one end of the connection shaft, and the end has a rectangular cross-section and the other end has a circular cross-section.