KR101363283B1 - Top entry ball valve with screwed seat structure - Google Patents

Abstract

The present invention relates to a ball valve, comprising: a ball member rotatably installed in a chamber of a valve body; A seat provided in at least one of said first flow path and said second flow path to pressurize said spherical surface when said ball member is in a closed position; Arranged around the outer circumferential surface of the seat and installed so as to be relatively rotatable with respect to the seat, a locking step is formed to interfere with the seat in the axial direction of the seat, and moves together with the seat in the direction toward the ball member; A seat retainer having protrusions protruding in the axial direction of the sheet; A guide retainer arranged in a shape surrounding the outer circumferential surface of the sheet, the surface facing the protrusion of the seat retainer being formed as a spiral surface continuously changing in the circumferential direction to protrude in the direction of the central axis of the sheet; A spring compressed between the guide retainer and the valve body; It is configured to provide a ball valve capable of maintaining and replacing the ball member for opening and closing the flow without disassembling the connecting pipe on both sides of the ball valve.

Description

TOP ENTRY BALL VALVE WITH SCREWED SEAT STRUCTURE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve, and more particularly, to a top entry ball valve having a spiral seat structure capable of maintaining and replacing a ball member for opening and closing a flow without disassembling connection pipes on both sides of the ball valve.

In general, the valve is widely used as a means for controlling the flow of fluid by selectively opening and closing the flow path connected to two or more pipes connected to the pipe.

Such a valve is installed to rotate the ball member in the chamber communicating with two or more flow paths in the valve body to open and close the flow path, and operates to selectively open and close the flow path by the rotation of the ball member.

According to the form of a ball member, a valve is divided into a butterfly valve which opens and closes a flow path by a plate-shaped ball member, a ball valve or a segment ball valve which opens and closes a flow path by a ball member having a spherical surface. Conventionally, a butterfly valve which can be easily and inexpensively manufactured has been widely used, but recently, a high sealing effect ball valve or a segment ball valve has been widely used. Here, the ball valve refers to a valve in which the ball member is formed in a spherical shape, and the segment ball valve refers to a valve in which the ball member is formed in a part of a sphere (for example, hemispherical).

In the ball valve, a ball member having a spherical surface formed with a flow path penetrating the center is installed in the central chamber of the valve body, and in an open state, the flow path communicates with each other through a through hole formed in the ball member, and in a closed state, the ball member is opened. It is configured to rotate from and block the flow path to the spherical surface of the ball. At this time, in order to improve the sealing performance in a closed state, a sheet is provided around the ball member, and a sealing ring formed of nylon is interposed between the sheet and the ball member.

However, the valve is installed to selectively open or close the flow path so that maintenance checks are performed periodically, and in some cases, the ball member needs to be replaced. However, in order to separate the ball member from the valve body separately, the valves connecting the flow paths must be separated from the flow paths, and thus, the maintenance and replacement process takes a long time and requires a difficult task.

Therefore, the necessity of the structure which can simply repair and replace a ball member without separating the ball valve provided between the connection pipe in which the flow path was formed is increasing.

The present invention relates to a ball valve capable of maintaining and replacing a ball member for opening and closing a flow without disassembling the connecting pipes on both sides of the ball valve.

The present invention provides a top entry ball valve having a spiral seat structure capable of maintaining and replacing a ball member for opening and closing a flow without disassembling connection pipes on both sides of the ball valve, in order to solve the problems described above. It aims to do it.

Through this, the present invention aims to check the operating state of the ball member of the ball valve within a short time and to shorten the time required for replacement even when replacement is required.

In addition, the present invention is to solve the problem that the airtightness of the flow path is impaired when the entire valve is separated from the flow path by performing the maintenance and replacement process of the ball member without separating the valve body from the flow path to be connected. do.

In order to achieve the object described above, the present invention includes a valve body having a chamber and having a first flow path and a second flow path communicating with the chamber; It is installed in the chamber rotatably so as to be located in an open position for communicating the first flow path and the second flow path through the communication hole, and in a closed position preventing the first flow path and the second flow path from communicating, A ball member which prevents the first flow path and the second flow path from communicating with each other by sealing a spherical surface of at least one of the first flow path and the second flow path in the closed position; A seat provided in at least one of said first flow path and said second flow path to pressurize said spherical surface when said ball member is in a closed position; Arranged in a shape surrounding the outer circumferential surface of the sheet and installed so as to be relatively rotatable with respect to the sheet, a locking step is formed to interfere with the sheet in the axial direction of the sheet, and moves together with the sheet in a direction toward the ball member. A seat retainer; A guide retainer arranged in a shape surrounding the outer circumferential surface of the sheet and in contact with the seat retainer in an axial direction; A spring compressed between the guide retainer and the valve body; And one of the seat retainer and the guide retainer is formed with protrusions protruding in the axial direction toward the other one, and the other of the seat retainer and the guide retainer has an axis facing the protrusion along the circumferential direction. A spiral surface is formed in which the degree of protruding in the direction is continuously changed, so that the seat approaches or moves away from the ball member according to the engagement rotation angle of the seat retainer and the guide retainer.

In this way, in selectively connecting the first flow path and the second flow path through the communication hole of the ball member, the sheets arranged on both sides of the ball member pressurizes the spherical surface of the ball member to secure airtightness. The seat retainer rotates relatively with respect to the guide retainer, thereby releasing the state in which the seat presses the sphere of the ball member, thereby making it easy to operate in a state where it can be detached for maintenance of the ball member. It becomes possible.

At this time, an opening larger than a cross section of the ball member is formed in an upper portion of the valve body, and the opening is configured to be opened and closed by a cover having a hole through which a control shaft for rotationally driving the ball member passes. The ball member can be easily separated through the opening of the valve body to perform maintenance or replacement of the ball member in a short time.

As described above, the present invention, in adjusting the position of the seat for pressing the spherical surface of the ball member rotatably installed in the chamber of the valve body, any one of the projection and the spiral surface is formed and moves with the seat; And a guide retainer in which the other of the projection and the spiral surface is formed while contacting the seat retainer, so that the seat presses or releases the spherical surface of the ball member by rotating the seat retainer relative to the guide retainer. It is possible to obtain an advantageous effect that the inspection such as maintenance of the ball member of the ball valve becomes easier.

Above all, according to the present invention, an opening having a size that allows the ball valve to be taken out of the valve body is formed on the upper side of the valve body, thereby adjusting the engagement rotation angle between the seat retainer and the guide retainer so that the ball member is not restrained by the seat. Since it is easy to operate and is configured in a top entry method in which only the ball member is pulled upward through the opening, the valve body of the ball valve and the like can be simultaneously removed without separating the ball valve from the pipes arranged on both sides of the ball valve. There is an advantageous effect that only the ball member can be taken out and maintenance or replacement can be performed simply without disassembling the parts.

Through this, the present invention can obtain an advantageous effect that can minimize the time and manpower required for the maintenance and replacement process of the ball valve.

In addition, since the present invention does not have to be separated from the pipes on both sides of the valve in the process of maintaining or checking the ball member of the ball valve, the advantages of maintaining the airtightness between the pipes on both sides and the valve are also obtained.

1 is a perspective view showing the appearance of a ball valve according to an embodiment of the present invention;
Figure 2 is an exploded perspective view of the ball valve of Figure 1
3 is a longitudinal sectional view of the ball valve of FIG.
4 is an enlarged view of portion 'A' of FIG.
5 is a view showing a state in which the distance between the seat retainer and the guide retainer is spaced the most;
Fig. 6 shows a state where the distance between the seat retainer and the guide retainer is closest;

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the ball valve 100 according to an embodiment of the present invention. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

Figure 1 is a perspective view showing the appearance of the ball valve according to an embodiment of the present invention, Figure 2 is an exploded perspective view of the ball valve of Figure 1, Figure 3 is a longitudinal sectional view of the ball valve of Figure 1, Figure 4 is An enlarged view of a portion 'A', FIG. 5 is a view showing a state where the distance between the seat retainer and the guide retainer is the most apart, and FIG. 6 is a view showing a state where the distance between the seat retainer and the guide retainer is closest.

As shown in the figure, the ball valve 100 according to an embodiment of the present invention, the outer shape of the valve and the first flow path 88 and the second flow path 99 and adjacent pipe (not shown) Valve body 110 is provided with flanges (88a, 99a) connected to the ball, the ball member 120 is installed rotatably in the central chamber of the valve body 110, and despite the rotation of the ball member 120 Seat 130 for pressing the spherical surface (120s) of the ball member 120 in the valve body 110 and the outer circumferential surface of the seat 130 in order to maintain the airtightness and the latch flange of the seat 130 The seat retainer 140 which interferes with the 135 and moves together in the direction toward the ball member 120 and the helical surface 152s contacting the protrusion 142 protruding in the axial direction of the seat retainer 140 are formed. A guide retainer 150 arranged to enclose the sheet 130 and an axial direction around the guide retainer 150 Some are inserted into the formed grooves 153 and the other end is installed to support the inner wall of the valve body 110 to apply the elastic restoring force to move the guide retainer 150 toward the direction in which the ball member 120 is located. It is composed of a spring 160, and the operation unit 170 for operating to rotate the ball member 120 to selectively open and close the first passage 88 and the second passage (99).

The valve body 110 is formed of a metal material and a chamber in which the ball member 120 is located is formed in the center. And the opening 115a which is opened and closed by the cover 115 is formed in the upper side of the ball member 120. The opening 115a is formed larger than the cross section of the ball member 120 to insert and withdraw the ball member 120. On the bottom of the valve body 110, a pedestal 118 for positioning the rotational center of the ball member 120 is fixed to guide the ball member 120 to rotate at a predetermined position.

The ball member 120 is located in the chamber of the valve body 110 and is rotatably positioned by the operation unit 170. The ball member 120 has a communication hole (120a) is formed in the center portion, allowing the flow if the communication hole (120a) is arranged in parallel with respect to the first passage 88 and the second passage 99, the first passage If the communication hole 120a is vertically arranged with respect to the 88 and the second passage 99, the flow is blocked.

The seat 130 presses the spherical surface 120s of the ball member 120 to prevent the fluid from leaking into the gap between the ball member 120 and the seat 130. The seat 130 is arranged on both sides of the ball member 120, and grooves (not shown) are formed in the circumferential direction on the surface contacting the ball member 120, the sealing ring 134 formed of a nylon material in the groove The fitting 130 allows the sheet 130 to contact the spherical surface 120s of the ball member 120 by the sealing ring 134. As a result, even if the sealing ring 134 is worn out by abrasion, the airtightness can be maintained by pressing the ball member 120 stably for a long time.

The seat retainer 140 is formed to surround the outer circumference of the seat 130 as shown in FIGS. 3 to 6, and is rotatable relative to the seat 130 and in an axial direction with respect to the seat 130. The first flow path and the second flow path) are installed to be movable. The end of the seat retainer 140 is formed on one surface of the inward flange 145 which interferes with the engaging flange 135 of the seat 130 toward the ball member 120, so that the seat retainer 140 is the ball member 120 , The seat 130 also moves toward the ball member 120 together with the seat retainer 140 due to the interference between the inward flange 145 of the seat retainer 140 and the engaging flange 135 of the seat 130. Move.

A plurality of pin holes 144 are formed on the outer circumferential surface of the seat retainer 140. This pin hole 144 is used to fix the rotational position of the seat retainer 140 by a pin 88 'penetrating the through hole 119 formed in the valve body 110. Then, the adjustment pin in the pin hole 144 of the seat retainer 140 through the slit-shaped adjustment hole (not shown) formed long in the circumferential direction on the opposite side of the valve body 110 (the other side of the ground shown in Figure 2). By inserting and fixing (not shown), an operator for maintenance may be used to rotate the seat retainer 140. At this time, the adjustment pin is formed longer than the pin that is fitted to fix the position of the seat retainer 140.

The guide retainer 150 is formed to surround the outer circumference of the seat 130 as shown in FIGS. 3 to 6, and is installed to be movable in the axial direction with respect to the seat 130. Rotation does not necessarily need to be constrained with respect to the seat 130, but a protrusion is provided on the outer circumferential surface of the seat 130 in the axial direction, and a groove for accommodating the protrusion is formed long, and the seat 130 is disposed in the axial direction. Although movable relative to the seat 130, relative rotation may be restrained with respect to the seat 130.

At this time, since the distance from the center of rotation to the projection 142 and the distance from the center of rotation to the spiral surface 152s are the same, the seat retainer 140 and the guide retainer 150 mutually rotate in a concentric state.

On the other hand, the projection 142 is formed on the other surface of the seat retainer 140 on the opposite side of the surface facing the ball member 120 in the axial direction at intervals of 120 degrees. In addition, on one surface of the guide retainer 150 facing the ball member 120, a spiral surface 152s having a continuously varying degree of protruding in the axial direction is formed in a constant pattern every 120 degrees. The protrusion 142 of the seat retainer 140 moves along the spiral surface 152s of the guide retainer 150.

That is, as shown in FIG. 5, when the seat retainer 140 is rotated relative to the guide retainer 150 in the direction indicated by the reference numeral 140r, the protrusions 142 of the seat retainer 140 are guide retainer 150. The distance between the seat retainer 140 and the guide retainer 150 as the seat retainer 140 moves in the direction 140d proximate to the ball member 120 while rotating in the spiral surface 152s thereof. Is far away. This continues until it reaches the top (152y, the most protruding position in the axial direction) of the spiral surface 152s of the guide retainer 150 as shown in FIG.

At this time, the ball 148 is inserted into the groove 142a formed in the front end surface of the protrusion 142, the contact between the protrusion 142 and the spiral surface 152 is made by the rolling motion of the ball 148. Accordingly, the rotational movement between the seat retainer 140 and the guide retainer 150 is smoothly made with low friction. On the other hand, the top 152y of the spiral surface 152s so that the operator can know that the projection 142 of the seat retainer 140 has reached the top 152y of the spiral surface 152s of the guide retainer 150. There is formed a sensing groove 150z into which a part of the ball 148 can be inserted. Accordingly, the operator can accurately grasp the state in which the sealing ring 134 of the seat 130 is in close contact with the ball member 120 by rotating the seat retainer 140.

On the contrary, as shown in FIG. 6, when the seat retainer 140 is rotated relative to the guide retainer 150 in the direction indicated by reference numeral 140r ', the protrusion 142 of the seat retainer 140 is guide retainer 150. The gap between the seat retainer 140 and the guide retainer 150 as the seat retainer 140 moves in the direction 140d 'away from the ball member 120 while rotating in the spiral surface 152s of ) Is getting closer. This continues until it reaches the step 152x formed by the stepped top 152y of the spiral surface 152s of the guide retainer 150 as shown in FIG.

As such, when the distance x2 between the seat retainer 140 and the guide retainer 150 is closest to each other, the elastic restoring force of the spring 160 hardly or never acts, and the ball member 120 ) Becomes a free state that is not pressed from the sheet 130. To this end, the movement stroke x between the seat retainer 140 and the guide retainer 150 is preferably set larger than the compression length of the spring 160.

The spring 160 is installed so that a part is inserted into the plurality of grooves 153 formed in the axial direction around the guide retainer 150 and the other end is supported on the inner wall of the valve body 110, thereby maintaining the guide retainer 150. An elastic restoring force is applied to move toward the direction in which the ball member 120 is located. That is, as shown in FIG. 4, the guide retainer 150 is pushed toward the ball member 120 by the elastic restoring force 160f of the spring 160 and the spiral surface 152 of the guide retainer 150. The guide retainer 150 pushes the seat retainer 140 in the direction indicated by 150f through the protrusion 142 of the seat retainer 140 and the inward protrusion 145 of the seat retainer 140 and the seat 130. The seat 130 is pushed and moved in the direction indicated by 130f by the interference of the locking flange 135, so that the sealing ring 134 presses the spherical surface 120s of the ball member 120.

However, as shown in FIG. 6, when the distance x between the seat retainer 140 and the guide retainer 150 becomes small to reach the distance indicated by x2, the seat retainer 140 and the guide retainer 150 are relative to each other. Since the spring 160 is not closely compressed, the sealing ring 134 of the seat 130 does not come into contact with the spherical surface 120s of the ball member 120 even when the spring 160 is not compressed. Therefore, the ball member 120 is not restrained by the seat 130 to be easily maintained by the operator, or can be easily pulled out through the opening 115a of the valve body 110.

The operation unit 170 includes a handle 171 which is rotated by an operator, a reducer 172 which changes the rotation direction of the handle 171 by 90 degrees, and a stem which rotates in conjunction with a driven shaft of the reducer 172. 174). The stem 174 is integrally formed with or coupled to the ball member 120 to rotate (174d) with the ball member 120, and the center hole of the lid 115 to open and close the opening 115a of the valve body 110. It extends through the speed reducer 172. In the drawing, reference numeral 173 denotes a member that opens and closes a sealing O-ring between the cover 115 and the stem 174.

On the other hand, in the state in which the ball valve 100 is coupled to the connection pipe (not shown), the seat 130 should be kept in close contact with the ball member 120, the protrusion 142 of the seat retainer 140 is guided It is necessary to fix the position which reached the top 152y of the spiral surface 152 of the retainer 150. As shown in FIG. To this end, the pin 88 ′ is inserted into the pin hole 144 formed on the outer circumferential surface of the seat retainer 140 across the through hole 119 of the valve body 110.

And, when the operator wants to check or replace the state of the ball member 120 of the ball valve 100, remove the pin 88 'fitted to fix the position of the seat retainer 140, the valve body ( Insert a control pin (not shown) into the pin hole 44 through the control hole (not shown) formed in the circumferential direction in the circumferential direction 110, and then rotate the seat retainer 140 in the direction shown in Figure 6 with the adjustment pin In this way, the pressurized state between the seat 130 and the ball member 120 can be released. Then, the cover 115 of the valve body 110 is opened to check the state of the ball member 120, or the ball member 120 is pulled out through the opening 115a of the valve body 110 to be replaced or overhauled. You may.

As such, the ball valve 100 according to the embodiment of the present invention configured as described above is pressed by the seat 130 and the ball member 120 by the relative rotation of the seat retainer 140 and the guide retainer 150. It is configured to set or release, which has the advantage that maintenance is faster and cheaper in that the ball member 120 can be operated in a free state with a simple structure.

Above all, the ball valve 100 according to the present invention can maintain and check the ball member 120 while maintaining the state in which the valve body 110 is connected to the adjacent pipe as it is, the convenience of maintenance increases And the time is shortened, it is possible to obtain an advantageous effect that can maintain the airtightness at the time of the existing installation of the ball valve 100.

In the above, the preferred embodiments of the present invention have been described by way of example, but the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

For example, in the present embodiment, a configuration in which three protrusions 142 are formed at intervals of 120 degrees is taken as an example, but according to another embodiment of the present invention, two or more protrusions 142 may be formed. . However, since three or more protrusions 142 are formed, the seat retainer 140 and the guide retainer 150 are in contact with each other at three or more points. It becomes possible.

In addition, although the structure which the processus | protrusion 142 is formed in the sheet retainer 140, and the spiral surface 152s is formed in the guide retainer 150 was mentioned as the example in the figure, According to another embodiment of this invention, the sheet retainer 140 The spiral surface is formed in the guide retainer 150 may be configured to form a projection.

100: valve 110: valve body
120: ball member 130: sheet
140: seat retainer 150: guide retainer
160: spring 170: control panel

Claims (5)

A valve body having a chamber, a first flow passage communicating with the chamber, a second flow passage formed, and an opening formed at an upper portion thereof;
It is installed in the chamber rotatably so as to be located in an open position for communicating the first flow path and the second flow path through the communication hole, and in a closed position preventing the first flow path and the second flow path from communicating, In the closed position, the ball member is formed in a cross section smaller than the opening to prevent communication between the first passage and the second passage by spherical contacting and sealing one or more passages of the first passage and the second passage. Wow;
A seating flange provided on at least one of the first flow path and the second flow path, the locking flange protruding on an outer circumferential surface, and pressing the spherical surface when the ball member is in a closed position;
A seat arranged in a shape surrounding the outer circumferential surface of the seat and installed to be relatively rotatable with respect to the seat, and having an inward flange interfering with the locking flange in an axial direction, and moving together with the seat in a direction toward the ball member. Retainer;
A guide retainer arranged concentrically with the seat retainer and in contact with the seat retainer in an axial direction while surrounding an outer circumferential surface of the sheet;
A spring compressed between the guide retainer and the valve body;
And one of the seat retainer and the guide retainer is formed with protrusions protruding in the axial direction toward the other one, and the other of the seat retainer and the guide retainer has an axis facing the protrusion along the circumferential direction. And a spiral surface is formed in which the degree of protruding in the direction is continuously changed, and the seat approaches or moves away from the ball member according to the engagement rotation angle between the seat retainer and the guide retainer.
The method of claim 1,
The projections are formed to protrude in the axial direction at least three at a predetermined angle in the circumferential direction, the spiral surface is the ball valve, characterized in that the spiral surface is formed by giving a angular interval divided by the number of the projection 360 degrees.
3. The method of claim 2,
And a ball is interposed between the protrusion and the spiral surface.
The method according to any one of claims 1 to 3,
A pin hole is formed at intervals around the seat retainer, and a through hole aligned with the pin hole is formed through the valve body, and a fixing pin is inserted into the pin hole through the through hole of the valve body. Thereby fixing the position of the seat retainer and the guide retainer.
The method according to any one of claims 1 to 3,
And when the distance between the seat retainer and the guide retainer is closest to each other, the ball restoring force of the spring does not act.

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