KR101062164B1 - Ball valve leakage prevention device - Google Patents

Abstract

The present invention relates to a ball valve that is installed on a pipeline for transferring steam or fluid of high temperature and high pressure to control the flow of steam or fluid, and the leak phenomenon generated between the valve body, the fastening cap, the valve seat, and the stem. It increases the airtightness of the ball valve while smoothly opening / closing operation, and maintains the airtightness in the expansion and contraction action caused by high temperature / high pressure steam or cryogenic fluid, which not only increases the reliability of the product but also extends the life of the product. It relates to a gas tight device for a ball valve.
The main configuration according to an embodiment of the present invention is the valve body is formed in the annular stepped on the inner side, the boss is formed on the outside; A coupling cap coupled to one side of the valve body and having an annular stepped jaw formed at an inner side thereof; An opening / closing ball inserted into an inner space of the valve body and the fastening cap; A handle for rotating the opening and closing ball; A stem inserted into the boss of the valve body and coupled to the opening / closing ball and the handle; And a valve seat inserted into the inner surface of the stepped body formed in the valve body and the fastening cap, and in close contact with the outer circumferential surface of the opening / closing ball. The valve seat includes a fastening groove formed in an annular shape on one side thereof, It includes an o-ring that is installed, the u-packing is inserted between the stem and the boss of the valve body; is implemented.

Description

Ball valve leakage prevention device

The present invention relates to a ball valve installed on a pipeline for transferring steam or fluid of high temperature and high pressure to regulate the flow of steam or fluid, and more specifically, to selectively rotate to interrupt the flow of steam or fluid. In the ball valve with ball and valve seat and stem, O-ring is fitted to the valve seat while oil-packing pressurized by the bottom of the handle is fitted to the stem which rotates the ball. It prevents leakage of steam or fluid generated between the seat and the stem to increase the airtightness of the ball valve, and smoothly opens and closes it, and maintains airtightness even when expanded or contracted by high temperature / high pressure steam or cryogenic fluid. The present invention relates to an airtight device for a ball valve that not only increases the reliability of the product but also extends the life of the product.

In general, a ball valve is installed as a valve to allow or block the flow of steam and fluid on a pipe for transporting various fluids including high temperature and high pressure steam or water, and most of the ball valves are valve bodies. Rotating the handle exposed to the upper portion of the opening and closing ball installed therein to allow or block the flow of steam and fluid.

In the prior art, the ball valve is composed of a valve body 10, a fastening cap 20, a ball 30, a handle 40, a stem 50, and a valve seat 60 as shown in FIG. The opening and closing ball 30 is inserted into the internal space of the valve body 10 while the fastening cap 20 is coupled to one side of the valve body 10, the boss 12 formed on the valve body 10. The stem 50 to which the O-ring 51 is fastened is inserted through the hole, and the valve seat 60 is inserted into the valve body 10 and the inner surface of the fastening cap 20 to be in close contact with the ball 30. do.

In the ball valve of the prior art, the valve seat is formed in the shape of a ring to maintain the airtightness of the valve, the valve seat is inserted into the inner surface of the step (11) (21) formed inside the valve body and the fastening cap is interpolated, It adheres to the outer circumferential surface of the opening and closing ball to maintain airtightness. Mostly, it is made of Teflon material and has characteristics such as heat resistance, insulation, and low coefficient of friction.

In the prior art ball valve, the valve seat is fitted to the inner surface of the valve body and the fastening cap and is in close contact with the outer circumferential surface of the ball by the fastening force of the fastening cap in the state inserted into both sides of the ball, so that the fastening force of the fastening cap is strong, the valve seat and Increasing the adhesion of the ball is difficult to rotate the ball, on the contrary, if the tightening force of the fastening cap is weak, there is a problem that the high pressure and high pressure steam or fluid leaks as the adhesion of the valve body and valve seat and the ball is lowered.

That is, when the tightening force of the valve body and the fastening cap is strong, the adhesion between the valve seat and the ball is increased, so the rotational operation of the ball is difficult and the opening and closing operation of the valve is impossible, and the valve body and the tightening cap of the fastening cap are weak. Since the adhesion between the valve seat and the ball is lowered, a fine gap is generated, and when the pressure of the steam or the fluid is high, there is a problem that the steam or the fluid leaks.

In addition, the conventional prior art ball valve is installed by inserting a plurality of O-rings on the stem to prevent leakage between the hole formed in the boss of the valve body and the stem, the conventional O-ring fastened to the stem has a high pressure of steam or fluid In this case, the airtightness is lowered, and when the expansion and contraction action occurs due to the high temperature / high pressure steam or the cryogenic fluid, not only the airtightness is very weak but also the durability is degraded when used for a long time.

The present invention is a conventional ball valve of the prior art when the tightening force of the valve body and the fastening cap is strong, the problem that the opening and closing operation of the valve is impossible due to the difficult rotational operation of the opening and closing ball, when the tightening force of the valve body and the fastening cap is weak, fine It is a technology designed to improve the problem of leakage of steam or fluid due to a gap and the problem of leakage of steam or fluid between the stem and the hole formed in the boss of the valve body, between the valve body and the fastening cap and the valve seat and stem. It prevents the leakage of steam or fluid generated in the air and improves the airtightness of the ball valve, and smoothly opens and closes the operation.It also maintains the airtightness in the expansion and contraction action caused by high temperature / high pressure steam or cryogenic fluid. Balls and valve seats and valves that restrict steam or fluid flow An object of the present invention is to provide an airtight device for a ball valve which is installed by inserting an O-ring in the valve seat in a ball valve to which the system is applied, and inserting an oil packing (pressurized by a handle) in a stem for rotating the ball.

The present invention is to realize the desired object as described above,

An annular stepped portion is formed on the inner side, and a valve body having a boss formed on the outer side; A coupling cap coupled to one side of the valve body and having an annular stepped jaw formed at an inner side thereof; An opening / closing ball inserted into an inner space of the valve body and the fastening cap; A handle for rotating the opening and closing ball; A stem inserted into the boss of the valve body and coupled to the opening / closing ball and the handle; And a valve seat inserted into the inner surface of the stepped body formed in the valve body and the fastening cap, and in close contact with the outer circumferential surface of the opening / closing ball. The valve seat includes a fastening groove formed in an annular shape on one side thereof, It includes an O-ring that is installed, is inserted between the stem of the stem and the boss of the valve body and is pressed by the handle and the oil packing is in close contact with the boss and the stem; is implemented.

According to an embodiment of the present invention, in the ball valve is applied to the ball and valve seat and the stem to regulate the flow of steam or fluid, the O-ring is fitted to the valve seat while the opening and closing the stem to rotate the ball for opening and closing By installing the product into the valve body, it prevents the leakage of steam or fluid generated between the valve body, the fastening cap, the valve seat and the stem, thereby improving the airtightness of the ball valve and smoothly opening and closing the operation. It maintains hermeticity in the expansion and contraction action caused by the fluid, which not only increases the reliability of the product but also provides the effect of extending the life of the product.

Particularly, in the embodiment of the present invention, the O-ring is fitted to the valve seat and is installed in close contact with the inner side of the step formed in the valve body and the fastening cap, thereby effectively improving the airtightness of the ball valve and installing the oil packing between the boss and the stem of the valve body. In accordance with this to prevent the leakage of steam or fluid to provide an effect of further enhancing the airtightness of the ball valve.

1 is a cross-sectional view showing an installation state of a conventional ball valve.
2 is a cross-sectional view showing an installation state according to an embodiment of the present invention.
Figure 3 is an exploded perspective view showing a valve seat in an embodiment of the present invention.
Figure 4 is a cross-sectional view showing a valve seat in an embodiment of the present invention.
Figure 5 is a sectional view of the main part showing the installation state of the valve seat in the present invention.
Figure 6 is a sectional view of the main portion showing another installation state of the valve seat in the present invention.
Figure 7 is a cross-sectional view showing the milking in the embodiment of the present invention.
Figure 8 is a sectional view of the main portion showing the installation state of the u-packing in an embodiment of the present invention.
9 is a sectional view showing the principal parts showing the airtight state of the milking in the embodiment of the present invention.

The main point of the embodiment of the present invention is to prevent the leakage occurring between the valve body and the fastening cap and the valve seat and stem to increase the airtightness of the ball valve while smoothly opening and closing operation, high temperature, high pressure steam or cryogenic It is intended to maintain the airtightness due to the expansion and contraction caused by the fluid, thereby increasing the reliability of the product and extending the life of the product.

Looking at the main configuration of the airtight device for a ball valve according to an embodiment of the present invention, an annular step 11 is formed on the inner side, the valve body 10 is formed with a boss 12 on the outside; A coupling cap 20 coupled to one side of the valve body 10 and having an annular stepped portion 21 formed on an inner side thereof; An opening / closing ball 30 inserted into an inner space of the valve body 10 and the fastening cap 20; A handle 40 for rotating the opening and closing ball 30; A stem 50 fitted to the boss 12 of the valve body 10 and coupled to the opening / closing ball 30 and the handle 40; And a valve seat 60 inserted into an inner surface of the stepped portions 11 and 21 formed in the valve body 10 and the fastening cap 20 and in close contact with an outer circumferential surface of the opening and closing ball 30. The valve seat 60 includes a fastening groove 61 formed in an annular shape on one side, and an O-ring 62 fitted to the fastening groove 61, and includes a boss of the stem 50 and the valve body 10. It is installed between the (12) and pressurized by the handle, the side surface is in contact with the boss and the stem (70); comprises a.

In the main configuration of the embodiment, the valve body 10 is formed of brass or stainless steel, in consideration of corrosion resistance and durability, as in the prior art, and has a high temperature and high pressure on one side. A screw portion is formed to couple the transfer pipe to which steam or fluid is supplied, and the stepped portion 11 is formed in an annular shape on the inner surface of the inner space.

In the valve body 10 is provided with an internal space so that the opening and closing ball 30 is inserted, and the threaded portion is formed so that the fastening cap 20 is coupled to the opposite side to which the transfer pipe is coupled, the upper center of the outer surface The boss 12 into which the stem 50 is fitted is formed.

In addition, the fastening cap 20 in the main configuration of the embodiment is preferably formed of the same brass or stainless steel material as the valve body 10, the opening and closing ball 30 is interpolated in the internal space of the valve body 10 In the state is screwed to the valve body 10, the screw is formed so that one side of the high-temperature, high-pressure steam or fluid supply pipe is coupled, while the stepped portion 21 is formed in the annular inner surface of the inner space.

In the above, the fastening cap 20 is screwed to one side of the valve body 10 in the case of a small ball valve, and also coupled to the flange method in the case of a large ball valve, and also the valve body 10 and the fastening cap Coupling method of the transfer pipe coupled to (20) is also installed in the screw or flange method according to the small or large ball valve.

Meanwhile, in the main configuration of the embodiment, the opening and closing ball 30 is preferably formed of stainless steel in consideration of corrosion resistance and durability, and a transfer pipe coupled to the valve body 10 and the fastening cap 20. Opening and closing holes are formed to supply high-temperature, high-pressure steam or cryogenic fluid through the air.

In addition, the handle 40 in the main configuration of the embodiment as a function to selectively open and close the ball valve by rotating the opening and closing ball 30, the stem 50 in the boss 12 formed in the center of the outer surface of the valve body 10 ) Is fitted to the center of the outer circumferential surface of the opening and closing ball 30, the handle 40 is fixed to the upper end of the stem 50 exposed to the outside of the boss 12.

The handle 40 may be formed of a metal or plastic material, and may be installed in various forms, such as a linear lever type and a circular rotary type, and rotate the opening and closing ball 30 and the stem 50 at right angles. The ball valve can be opened and closed.

In addition, in the main configuration of the embodiment, the stem 50 is a function of opening and closing the ball 30 by transmitting the rotational force of the handle 40 to the opening and closing ball 30, it is fitted to the boss 12 of the valve body 10 It is coupled to the opening and closing ball 30 and the handle 40, a plurality of O-rings 51 are fastened to the outer periphery is inserted into the hole of the boss 12 is installed.

In addition, in the main configuration of the embodiment, the valve seat 60 is a function of maintaining the airtightness of the valve body 10, the fastening cap 20, and the opening / closing ball 30, and the valve seat 60 is heat resistant, insulated and low. It is preferable to be formed of a Teflon (Teflon) material having a characteristic such as a friction coefficient, it is formed in a ring shape as shown in Figure 2 to 5 in the drawing step 11 formed in the valve body 10 and the fastening cap 20 It is inserted into the inner side of 21 and is interpolated.

In the embodiment of the present invention, the valve seat 60 is made of carbon fiber mixed with Teflon with a material having excellent durability and a significantly low shrinkage expansion rate, and particularly, a ball valve for a high temperature / high pressure steam or a cryogenic fluid. As it is implemented to suit, the mixture for forming the valve seat 60 is shown in Table 1 below.

Property Unit Value Filler (carbon fiber) % 9.9 Apparent Bulk Density g / l 836 Spesific gravity 2.08 Tensile strength MPa 19.7 Elongation % 241

The valve seat 60 has a ring groove 61 in an annular shape around the edge of one side of the valve body 10 and one side in close contact with the inner edge of the step 11 and 21 formed in the fastening cap 20. The O-ring 62 is formed in the fastening groove 61, and the O-ring 62 is formed of a material such as silicone, urethane, methyl metaacrylate-butadiene rubber (MBR) having excellent elasticity, weather resistance, heat resistance, and corrosion resistance. It is preferred to be molded into.

In the above embodiment, when the fastening force is applied by coupling the fastening cap 20 to the valve body 10, the O-ring 62 is pressed against the inner edge of the step 11 and 21, and the pressure of the valve is compressed. Airtightness can be increased.

In addition, as an embodiment of the present invention, the valve seat 60 is in the middle of one side in close contact with the inner surface of the step 11, 21 formed in the valve body 10 and the fastening cap 20 as shown in Figure 6 A fastening groove 61 is formed in an annular shape, and an O-ring 62 is fitted into the fastening groove 61, and the middle part of the outer circumferential surface closely contacted with the inner surface of the valve body 10 and the fastening cap 20. A fastening groove 61 is formed in an annular shape, and the O-ring 62 may be fitted into the fastening groove 61.

In the above embodiment, when the fastening force is applied by coupling the fastening cap 20 to the valve body 10, the inner surface of the step 11 and 21 and the inner surface of the valve body 10 and the fastening cap 20 are fixed. As the O-ring 62 in close contact with the pressure ring is compressed, the airtightness of the valve may be further increased.

In addition, in the main configuration of the embodiment, the milking 70 is a function of preventing the leakage of steam or fluid between the boss 12 and the stem 50 of the valve body 10, in Figure 7 to 9 and Likewise, the u-packing 70 has an annular shape and is formed in a shape of a cross-section "∩", and is made of a material such as silicone, urethane, methyl metaacrylate-butadiene rubber (MBR), etc., which has excellent elasticity, weather resistance, heat resistance, and corrosion resistance. Do.

The milking packing 70 is formed in the valve body 10, the packing groove 13 is formed inside the upper end of the boss 12, and inserted into the packing groove 13 to be in close contact with the outer periphery of the stem 50 It is fastened, the upper end of the u-packing 70 is pressed by the bottom of the handle 40 is not only to prevent the separation and flow, but also the side wall is in close contact with the boss and stem can effectively prevent the leakage of fluid.

As shown in FIG. 9, the u-packing 70 according to the above-described embodiment is steam of high temperature and high pressure between the hole of the boss 12 and the stem 50 through the O-ring 51 fastened to the stem 50. When the cryogenic fluid leaks out, the milk packing 70 expands and expands as steam or fluid flows into the inner space of the milk packing 70, and thus the oil pack 70 is formed on the inner surface of the packing groove 13 and the outer circumferential surface of the stem 50. Since the packing 70 is pressurized to increase airtightness, leakage of steam or fluid is prevented.

Therefore, the embodiment of the present invention by installing the O-ring 62 in the valve seat 60, by preventing the leakage phenomenon occurring between the valve body 10 and the fastening cap 20 and the valve seat 60 valve It improves airtightness and smoothly open / close operation to increase the reliability of the product and extend the life by maintaining airtightness even in the expansion and contraction action caused by high temperature, high pressure steam or cryogenic fluid.

In addition, the embodiment of the present invention by inserting the milk packing 70 between the boss 12 and the stem 50 of the valve body 10, the steam or fluid generated between the boss 12 and the stem 50 This prevents leakage and improves the airtightness of the valve, improving the reliability of the product.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It is possible to carry out various changes in the present invention.

10: valve body 11: step
12: Boss 13: Packing groove
20: fastening cap 21: step
30: ball 40: handle
50: stem 51: O-ring
60: valve seat 61: tightening groove
62: O-ring 70: milking

Claims (5)

A valve body 10 having an annular stepped portion 11 formed on an inner side thereof and a boss 12 formed on an outer side thereof; A coupling cap 20 coupled to one side of the valve body 10 and having an annular stepped portion 21 formed on an inner side thereof; An opening / closing ball 30 inserted into an inner space of the valve body 10 and the fastening cap 20; A handle 40 for rotating the opening and closing ball 30; A stem 50 fitted to the boss 12 of the valve body 10 and coupled to the opening / closing ball 30 and the handle 40; It includes; the valve seat 60 is inserted into the inner surface of the step (11, 21) formed in the valve body 10 and the fastening cap 20, in close contact with the outer peripheral surface of the opening and closing ball 30;
The valve seat 60 includes a fastening groove 61 formed in an annular shape on one side, and an O-ring 62 fitted to the fastening groove 61.
One end is formed in an annular shape in the form of "∩", is inserted into the packing groove 13 formed inside the upper end of the boss 12 and fastened to be in close contact with the outer periphery of the stem 50, the upper end of the handle 40 It is pressurized by the bottom of the) sidewall is in close contact between the inner surface of the boss 12 and the outer surface of the stem (50) to seal the fluid from leaking between the boss and the stem 70; Airtight device for ball valve.
The method of claim 1;
The valve seat 60 is
A fastening groove 61 is formed in an annular shape around the edge of the edge closely contacting the inner edge of the step 11 and 21 formed on the valve body 10 and the fastening cap 20, and the fastening groove 61 is formed. Air ring device for a ball valve, characterized in that the O-ring (62) is inserted into the installation.
The method of claim 1;
The valve seat 60 is
A fastening groove 61 is formed in an annular shape on the side of the valve body 10 and the stepped portions 11 and 21 formed in the fastening cap 20 and an O-ring 62 is fitted into the fastening groove 61. On the other hand, a fastening groove 61 is formed in an annular shape on the outer circumferential surface of the valve body 10 and the inner surface of the fastening cap 20, and the O-ring 62 is fitted into the fastening groove 61. Sealing device for ball valve.
delete The method of claim 1;
The oil packing 70 is a ball, characterized in that the pressure is in close contact with the inner surface of the packing groove 13 and the outer peripheral surface of the stem 50 when the steam or fluid leaks, expands and expands as the steam or fluid flows into the inner space Sealing device for valve.

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