KR20230111016A - Ball valve - Google Patents

Abstract

The present invention forms the radius of the joint surface of a valve seat to be larger than the radius of a ball so that the ball can consistently maintain the state of line contact at one point on the joint surface, to increase airtightness and reduce friction, thereby increasing operability and eliminating concerns about damage and abrasion. A ball valve is configured so that the end of an operating shaft operated by an opening and closing handle can be combined with a shaft combination groove formed on a ball for opening and closing a flow path, which is installed inside a main body, and the ball can be rotated by the opening and closing handle to allow fluid introduced through an inlet of the main body to circulate through an outlet formed on a sub-body coupled to one side of the main body. Valve seats are interposed between the main body and the sub-body on both sides of the ball to secure the operability of the ball while maintaining airtightness. The valve seats have the radius of the joint surface of a valve seat body formed to be larger than the radius of the ball and have a contact point that can be in line contact with the outer surface of the ball at any position on the joint surface so that the joint surface of the ring-shaped valve seat body in contact with the outer surface of the ball can maintain the state of line contact. A contact point protector is further included inside one end and the other end of the joint surface of the valve seat body being in line contact with the outer surface of the ball to prevent fluid and foreign substances from flowing into the contact point.

Description

Ball valve {BALL VALVE}

The present invention relates to a ball valve, and more particularly, to provide a valve seat for a ball valve improved to improve quality and durability by ensuring smooth operation while minimizing frictional resistance by making line contact between a ball and a valve seat, and eliminating the phenomenon of depositing foreign substances on the ball along with airtightness.

In general, there are various control means for controlling the flow of fluid passing through a pipeline, but ball valves, plug valves, butterfly valves, etc., which are excellent in installation convenience, structural safety, operation convenience and reliability, etc. are mainly used. Of these, ball valves are most commonly used.

The ball valve as described above is connected to the handle and the stem when the handle located on the upper part of the valve body is rotated, and the opening and closing ball installed inside the valve body rotates in contact with the valve seat to allow or block the flow of fluid passing through the valve body. It is composed of a structure.

Looking through the patent literature, the contents of the general prior art of the valve seat used for the above purpose are as follows.

Patent Document 1 is a seat for a ball valve that is installed on the inlet side and the outlet side of the valve body, and the outer circumferential surface of the ball contacts,

It is characterized in that it consists of a seat member formed in a ring shape having a fixed end fixed to the inner circumferential surface of the valve body by alternately stacking thin steel plates and graphite thin plates, and a ball contact portion where the side edges of the thin steel plate and the side edges of the graphite thin plate are alternately exposed to contact the balls.

Patent Document 2 is a seat ring for an annular metal ball valve disposed between a ball and a valve body,

an annular seat ring body having a flow path penetrating the seat ring; a support member installed on at least a portion of the seat ring body to support the seat ring body; And a cap surrounding at least a portion of the support member, wherein the seat ring body includes a space passing through the seat ring body in a flow direction from a first contact surface of the seat ring body in contact with the valve body to a second contact surface of the seat ring body in contact with the ball,

The support member is inserted into the space, the cap surrounds a portion of the support member in contact with the ball or the valve body, and is formed to protrude beyond the contact surface of the seat ring body, and the seat ring body is made of stainless steel, or plated with tungsten carbide or chrome carbide.

Patent Registration No. 10 - 01520782 - 0000 Patent Registration No. 10 - 1850373 - 0000

doesn't exist.

Among the prior art, Patent Document 1 is to form a ball contact portion in the seat holder to increase wear resistance and to respond to high temperature and high pressure, and Patent Document 2 is to install a support member made of graphite in the seat ring body to reduce friction It can be confirmed that it can withstand high temperatures.

In the prior art as described above, the main purpose is to reduce the frictional force while increasing the durability of the valve seat, but since the ball and the valve seat always maintain surface contact, the actual frictional force is not reduced. In addition, it is not possible to prevent wear (damage) of the ball or valve seat due to excessive surface contact.

This is because the contact surface of the valve seat in contact with the ball is machined to the same radius as the ball and brought into close contact with the ball, and even if another contact means is separately embedded in the contact surface between the ball and the valve seat, the contact surface of the contact means is also processed to the same radius as the ball. Therefore, the ball and the valve seat or the ball and the contact means always maintain an overall surface contact state.

In this way, since the ball and the valve seat maintain surface contact, the ball opens and closes, so an excessive actuation force is required, which causes the actuator to become enlarged, and it is difficult to secure a smooth actuation force.

In particular, when the valve seat is pushed by pressure in the process of processing the valve seat, or when the ball or valve seat is pushed by high-pressure fluid while the ball and valve seat are mounted, the contact surface of the valve seat is close to the ball. Stable close contact is not achieved, and the ball and the valve seat often have multiple contact surfaces.

In this state, in the process of opening and closing the ball, the ball gnaws the valve seat or the valve seat gnaws the ball, wear and damage occurs, and eventually the airtightness cannot be maintained, resulting in a problem that the fluid cannot be smoothly controlled.

Since the larger the size of the ball valve, the larger the contact area between the ball and the valve seat, it is difficult to ensure smooth operation, and the ball or valve seat must be replaced periodically due to severe wear due to frictional resistance. In addition to loss due to static electricity, a lot of cost and manpower must be invested in maintenance, so mano is difficult to follow.

Although the ball and the valve seat initially maintain surface contact, as time passes, fine gaps are generated due to wear and damage, and the inflow of fluid and foreign substances into the gap cannot be ruled out.

Accordingly, the present invention was invented to solve the above problems, and the end of the operating shaft 102 operated by the opening and closing handle 101 is coupled with the shaft coupling groove 104 formed in the ball 105 for opening and closing the passage installed inside the main body 103, and the ball 105 rotates by the opening and closing handle 101 to transfer the fluid introduced into the inlet 106 of the main body 103 to the main body 103 ) through the outlet 108 formed in the subbody 107 coupled to one side of the;

On both sides of the ball 105, a valve seat 110 is interposed between the main body 103 and the sub body 107 to ensure the operability of the ball 105 while maintaining airtightness. In the ball valve 100;

The valve seat 110 has a radius R2 of the connecting surface 113 of the valve seat body 112 larger than the radius R1 of the ball 105 so that the connecting surface 113 of the ring type valve seat body 112 in contact with the outer surface 111 of the ball 105 can maintain a line contact state;

To have a contact point (CP) that can be in line contact with the outer surface 111 of the ball 105 at any position between one end 114 and the other end 115 of the connecting surface 113 of the valve seat body 112;

Inside the one end 114 and the other end 115, both sides of the intermediate position (C) of the connecting surface 113 of the valve seat body 112 in line contact with the outer surface 111 of the ball 105, a contact point (CP) protector 120 is further included to prevent the inflow of fluid and to prevent foreign matter contained in the fluid from entering the contact point (CP);

By forming the radius of the joint surface of the valve seat larger than the radius of the ball, the ball continuously maintains a linear contact state at any point of the joint surface, thereby increasing airtightness and reducing friction to increase operability and avoiding damage and wear. It is possible to achieve the purpose.

The present invention improves the valve seat in contact with the ball to maintain line contact with the ball to minimize friction to ensure smooth operating force, as well as to minimize wear and damage of the ball or valve seat during operation. It has an effect that can contribute to the durability and quality improvement of the ball valve.

The present invention allows the ball and the valve seat to minimize the contact area through line contact, but sufficiently secures airtightness to prevent leakage of fluid so that there is no hindrance in performing the original function of the valve, thereby causing frequent maintenance in the process of use. It has the effect of reducing cost, time and manpower that can be caused.

The present invention improves the valve seat in contact with the ball so that the valve seat is continuously pushed in the direction of contact with the ball even after a period of time, so that foreign matter is prevented from being deposited on the surface of the ball while maintaining airtightness. It is an invention having various effects, such as preventing damage due to smooth operation and wear.

1 is a configuration diagram of a cross-sectional state exemplarily showing a ball valve to which the technique of the present invention is applied.
Figure 2 is a cross-sectional view showing an excerpt of a valve seat for a ball valve to which the technology of the present invention is applied.
Figure 3 is a cross-sectional view of a state in which the ball and valve seat of the ball valve to which the technique of the present invention is applied are in contact.
Figure 4 is a block diagram showing another example of a valve seat for a ball valve to which the technique of the present invention is applied.
Figure 5 is a block diagram showing another example of a valve seat for a ball valve to which the technique of the present invention is applied.
Figure 6 is a block diagram showing another example of a valve seat for a ball valve to which the technology of the present invention is applied.

Hereinafter, a preferred configuration and operation of the present invention for achieving the above object will be described with reference to the accompanying drawings.

1 is a cross-sectional configuration diagram showing a ball valve to which the technology of the present invention is applied, FIG. 2 is a cross-sectional view of a valve seat for a ball valve to which the technology of the present invention is applied, FIG. 3 is a cross-sectional view of a state in which a ball and a valve seat are in contact with a ball valve to which the technology of the present invention is applied, FIG. 4 is a configuration diagram showing another example of a valve seat for a ball valve to which the technology of the present invention is applied, FIG. 6 will be described together as a configuration diagram showing another example of a valve seat for a ball valve to which the technology of the present invention is applied.

In the conventional ball valve 100, the end of the operating shaft 102 operated by the opening and closing handle 101 is coupled with the shaft coupling groove 104 formed in the upper center of the ball 105 for opening and closing the passage installed inside the main body 103, and the ball 105 rotates according to the operation of the opening and closing handle 101 to transfer the fluid introduced into the inlet 106 of the main body 103 to the main body 103 It is possible to distribute through the outlet 108 formed in the subbody 107 coupled to one side of the.

On both sides of the ball 105, a valve seat 110 is interposed between the main body 103 and the sub body 107 to ensure the operability of the ball 105 while maintaining airtightness.

In the present invention, by improving the valve seat 110, the friction area is minimized through line contact with the ball 105 to prevent wear and damage, while stably maintaining airtightness and increasing contact with the ball. It is characterized in that it can prevent deposition of foreign substances on the surface.

In the valve seat 110 to which the technology of the present invention is applied, the radius R2 of the joint surface 113 of the valve seat body 112 is larger than the radius R1 of the ball 105 so that the joint surface 113 of the ring type valve seat body 112 in contact with the outer surface 111 of the ball 105 can maintain a line contact state.

In the present invention, the intermediate position (C) of the connecting surface 113 of the valve seat body 112 is exemplified to have a contact point (CP) so that it can make line contact with the outer surface 111 of the ball 105, and this would be most preferable, but as another example, a contact that can make line contact with the outer surface 111 of the ball 105 at any position in the space between one end 114 and the other end 115 of the connecting surface 113 It will be obvious that it can be configured to have a point CP.

Inside the one end 114 and the other end 115, both sides of the intermediate position (C) of the connecting surface 113 of the valve seat body 112 in line contact with the outer surface 111 of the ball 105, the inflow of fluid is prevented and a contact point (CP) protector 120 is further included to prevent foreign matter contained in the fluid from entering the contact point (CP).

In the contact point (CP) protector 120, a protector groove 121 is formed on the valve seat body 112 so as to be recessed in the valve seat body 112 in the inner direction (opposite to the ball), and the protector groove 121 is embedded with an airtight material 122 that can be connected to the outer surface 111 of the ball 105.

As another example, the scraper 123 is interposed together with the airtight material 122 in the protector groove 121 to scrape the outer surface 111 of the ball 105 to prevent deposition of foreign substances and to remove any deposited foreign substances by scraping in the process of opening and closing.

The scraper 123 may be interposed in the protector groove 121 together with the airtight member 122, or the protector groove 121 may be separately formed to interpose the airtight member 122 and the scraper 123 independently.

A contact protrusion 125 may be formed at the contact point CP formed on the contact surface 113 of the valve seat body 112 to protrude in the direction of the ball 105 to increase line contact.

As illustrated in the drawing of the present invention, the contact protrusion 125 may be configured in a semicircular shape or formed in an angular protrusion shape, so it may be configured in various shapes, so it is not specified in any one shape.

The contact protrusion 125 may be formed only at the contact point CP, but if there is wear of the contact protrusion 125 during long-term use, the ball 105 and the valve seat 110 may be damaged and airtightness deteriorated due to contact with the ball 105. One or more may be formed so that when one contact protrusion 125 wears out, another adjacent contact protrusion 125 may be connected to the ball 105.

As another example, the contact protrusion 125 is formed separately from the contact surface 113 and is inserted into the protrusion groove 126 formed at the contact point CP of the contact surface 113 of the valve seat body 112.

Between the rear end of the contact protrusion 125 and the protrusion groove 126, a pushing means 128 such as a spring is interposed to always push the contact protrusion 125 toward the outer surface 111 of the ball 105. Regardless of the period of use, a constant contact state may be maintained to maintain contact and airtightness.

In addition, an airtight material is provided on the contact protrusion 125 and a fluid is embedded in the protrusion groove 126 so that the contact protrusion 125 can always contact the outer surface 111 of the ball 105 by the force of the fluid.

Of course, the airtight member 122, the scraper 123, and the contact protrusion 125 interposed in the valve seat 110 are configured in the same ring shape as the valve seat 110, and the outer surface of the ball 105 111. It will be natural to configure to be in close contact with the entire.

The protector groove 121 and the protrusion groove 126 for accommodating the airtight member 122, the scraper 123, and the contact protrusion 125 are preferably formed in a direction perpendicular to the outer surface 111 of the ball 105. As another example, it may be formed in a direction parallel to the axis center P, which is the direction in which the valve seat 110 is coupled in the direction of the ball 105.

Looking at the state of use of the ball valve 100 to which the technology of the present invention as described above is applied, it is as follows.

The use of the valve seat 110 of the ball valve 100 to which the technology of the present invention is applied as described above is mounted inside the ball valve 100 and connected to the opening/closing handle 101. When the opening/closing handle 101 is moved in the direction of 90 degrees, the ball 105 rotates in the direction of 90 degrees, and the fluid hole 150 formed in the ball 105 matches the inlet 106 and the outlet 108 to pass fluid or not match. It is a well-known fact that the operation of blocking the fluid is performed by maintaining the offset state.

In this process, the amount of fluid passing is controlled by varying the degree of opening of the fluid hole 150 formed in the ball 105. When fully opened, the amount of fluid passing is maximized, and the amount of fluid passing can be controlled by varying the amount of opening. It will be natural.

In the present invention, the valve seat 110, which is located on both sides of the inner side of the main body 103 and the subbody 107 and supports the ball 105 and performs a function of preventing leakage of the circulating fluid, is in line contact with the ball 105. Since it is maintained, the frictional area is reduced and smooth operation can be ensured.

Since the outer surface 111 of the ball 105 and the connecting surface 113 formed on the valve seat body 112 of the valve seat 110 maintain a line contact state, friction is reduced to prevent the ball 105 and the valve seat 110 from abrasion and damage from gnawing each other, so that it is possible to increase airtightness while increasing durability.

This makes the radius R2 of the connecting surface 113 of the valve seat body 112 larger than the radius R1 of the outer surface 111 of the ball 105, so that the outer surface 111 and the connecting surface 113 are not in full surface contact, but line contact that comes into contact at only one point can be made.

In addition to the contact point CP, the contact point 113 further interposes the airtight material 122 or the scraper 123 in the protector groove 121 to prevent fluid or foreign substances from entering the contact point CP or the contact point 113. By blocking the inflow of foreign substances while increasing airtightness, it is possible to prevent deterioration in operability and to reduce wear and damage.

In addition, one or more contact protrusions 125 are formed at the contact point CP of the contact surface 113 of the valve seat body 112 to make line contact with the outer surface 111 by the contact protrusion 125, thereby increasing the line contact, and when one contact protrusion 125 is worn over time, it can be in line contact with the other contact protrusion 125 next to it, thereby extending the lifespan and reducing cost and time for maintenance. be able to

In the case of the contact protrusion 125, after being coupled to the protrusion groove 126 formed in the valve seat body 112, the contact protrusion 125 and the protrusion groove 126 are always pushed in the direction of the ball 105 by the pushing means 128 interposed between the protrusion 125 and the protrusion groove 126, so that the front end 127 of the contact protrusion 125 always makes line contact with the outer surface 111 of the ball 105 in a constant state and is airtight. and operability can be guaranteed.

The present invention forms the radius of the joint surface of the valve seat to be larger than the radius of the ball, so that the ball continuously maintains a line contact state at any one point of the joint surface to increase airtightness and reduce friction while increasing operability while increasing damage and wear.

100; ball valve
105; cheek
110; valve seat
111; outer face
112; valve seat body
113; synapse
120; contact point protector
121; protector home
122; airtight material
123; scraper
125; contact protrusion
126; projection groove
128; means of pushing
CP; point of contact

Claims (4)

The end of the operating shaft 102 operated by the opening/closing handle 101 is coupled to the shaft coupling groove 104 formed in the ball 105 for opening and closing the passage installed inside the main body 103, and the ball 105 rotates by the opening/closing handle 101 to transfer the fluid introduced into the inlet 106 of the main body 103 to the sub body 107 coupled to one side of the main body 103. allow circulation through outlet 108;
On both sides of the ball 105, a valve seat 110 is interposed between the main body 103 and the sub body 107 to ensure the operability of the ball 105 while maintaining airtightness. In the ball valve 100;
The valve seat 110 has a radius R2 of the connecting surface 113 of the valve seat body 112 larger than the radius R1 of the ball 105 so that the connecting surface 113 of the ring type valve seat body 112 in contact with the outer surface 111 of the ball 105 can maintain a line contact state;
To have a contact point (CP) that can be in line contact with the outer surface 111 of the ball 105 at any position between one end 114 and the other end 115 of the connecting surface 113 of the valve seat body 112;
Inside the one end 114 and the other end 115, both sides of the intermediate position (C) of the connecting surface 113 of the valve seat body 112 in line contact with the outer surface 111 of the ball 105, the ball valve further comprises a contact point (CP) protector 120 to prevent the inflow of fluid and foreign substances contained in the fluid from entering the contact point (CP). According to claim 1;
The contact point (CP) protector 120 includes a protector groove 121 formed to be concave inwardly of the valve seat body 112;
An airtight member 122 embedded in the protector groove 121 so as to be connected to the outer surface 111 of the ball 105;
It is interposed in the protector groove 121 together with the airtight material 122 or interposed between the protector groove 121 in which the airtight material 122 is interposed and another protector groove 121 to scrape the outer surface 111 of the ball 105. Ball valve characterized in that it comprises a scraper 123 for preventing foreign matter deposition. According to claim 1;
The contact point CP formed on the connecting surface 113 of the valve seat body 112 further includes one or more contact protrusions 125 formed so as to protrude in the direction of the ball 105 to increase line contact. Ball valve, characterized in that. According to claim 3;
The contact protrusion 125 is separately formed and inserted into the protrusion groove 126 formed at the contact point CP of the valve seat body 112 so that the tip 127 of the contact protrusion 125 is in contact with the outer surface 111 of the ball 105;
The contact protrusion 125 is always configured to push the contact protrusion 125 toward the outer surface 111 of the ball 105 by interposing a pushing means 128 between the rear end of the contact protrusion 125 and the protrusion groove 126. Ball valve, characterized in that.

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