KR101269692B1 - Sealant structure for teflon lined butterfly valve - Google Patents

Abstract

The present invention relates to an airtight structure for a valve which prevents damage of the upper portion of the stem and the valve body made of metal by inherently preventing the fluid having chemical properties from leaking in the direction of the stem hole. A valve body that is divided into two parts and disassembled by a bolt, and a stem hole formed so that upper and lower sides of the valve body can be coupled to stems protruding upward and downward of a disk having Teflon attached to a surface thereof. An inner diameter surface is provided with a ring-shaped valve seat connected to the teflon of the disk and coupled to maintain airtightness and chemical resistance, and the valve seat is provided with a rubber material so as to maintain a shape and elasticity and increase the bonding force with the valve body. Teflon is attached to the seat body and the outer surface of the seat body to correspond to a fluid having chemical properties A teflon liner butterfly valve configured to be provided;
An airtight ring for seating so as to be connected to the seat body of the valve seat coupled to the valve body in the stem hole formed in the valve body, and is located outside the airtight ring to the airtight ring in the inner and outer direction of the stem hole An airtight structure including a pressurizing ring for pressurizing, a teflon ring for finally blocking fluid leakage in the stem direction interposed outside the pressurizing ring, and a pressurizing spring for generating a pressing force interposed between the teflon ring and the packing gland. It is characterized by providing.

Description

Teflon liner butterfly valve hermetic structure {SEALANT STRUCTURE FOR TEFLON LINED BUTTERFLY VALVE}

The present invention relates to a Teflon liner butterfly valve hermetic structure, and more particularly to providing an improved hermetic structure to prevent the fluid from leaking through a portion connected to the stem for operating the disk constituting the valve. It is about.

Various types of valves used for controlling the flow of a fluid such as a liquid or a gas have been developed and used. Among them, a butterfly valve is widely used due to its ability to appropriately control the flow rate of a fluid.

In recent years, acid and alkaline chemicals are often used among the fluids. In this case, high corrosion resistance is required. However, since most of the valves are made of metal, the fluids that are easily corroded and leaked are frequently leaked. It is followed.

The valve installed in the fluid transporting line, such as highly corrosive chemicals, is coated with Teflon or Teflon on the surface of the disk and valve seat in direct contact with the fluid to increase corrosion resistance. The situation is to provide a butterfly valve of a more form.

Butterfly valve (1) having a Teflon liner as described above is configured as shown in Figure 5, looking at this as follows.

A valve body 5 which is divided into an upper body 2 and a lower body 3 and disassembled and assembled by a bolt 4 is provided. The stem hole 6 is provided at an upper side and a lower side of the valve body 5. The stem 9 is formed to protrude upward and downward from the disk 8 on which the Teflon grinding 7 is formed on the surface.

The inner diameter surface of the valve body 5 is connected to the Teflon grinding (7) of the disk 8 is coupled to the valve seat 10 of the ring shape to maintain the airtight and chemical resistance.

The valve seat 10 is provided with a rubber seat seat 11 to maintain the shape of the seat and have elasticity and to increase the bonding force with the valve body, the outer surface of the seat body 11, Teflon ( 12) and the stem hole 6 to which the stem 9 is coupled is provided with a simple airtight ring 13.

In the prior art as described above, a valve body that is not Teflon-lined is coupled to the stem groove formed on the upper side of the valve body so as to prevent the fluid from leaking to the outside through the stem hole. Through the stem hole of the valve body to the upper side of the fluid to prevent the fluid having a chemical characteristic is significantly lowered.

For this reason, when a fluid leaks from the contact surface between the disk and the valve seat, the fluid having a chemical characteristic passing through the valve moves upward through a minute gap between the stem hole and the stem formed in the valve body at a high temperature and high pressure. Inflows are inevitable and occur frequently in actual industrial sites.

As such, when a fluid having chemical properties flows into the valve body and stem without resistance to corrosion resistance, the valve body and stem may be corroded to increase the leakage of the fluid, thereby preventing the valve from performing its original function. Occurs.

In addition, when a fluid having chemical properties enters the valve body and the stem and is corroded, the stem may stick to the valve body, and thus, the opening and closing of the disk may not be performed smoothly, thereby effectively controlling the fluid. It is practically impossible to do.

In addition, due to the leakage of the fluid, as well as the periodic maintenance and damage to the valve to replace the new valve takes too much cost after installation, and in the case of leakage of a large risk factor, the surrounding atmosphere and soil, In addition to polluting the water quality, a lot of problems occur, such as threatening the physical safety of the worker during the maintenance work process.

Therefore, in the present invention to solve the above problems, the valve body is divided into upper body and the lower body and disassembled and assembled by bolts, and the upper and lower sides of the valve body of the disk attached to Teflon on the surface A stem hole formed to couple the stem protruding upward and downward, and an inner diameter surface of the valve body connected to the teflon of the disc to be connected to maintain a gas tightness and chemical resistance, and the valve The seat is formed of a rubber material so as to maintain the shape and increase the bonding force with the valve body, and Teflon is configured to cope with a fluid having chemical properties by attaching Teflon to the outer surface of the seat body A liner butterfly valve, comprising:

It provides an improved hermetic structure for preventing fluid from leaking upward through the stem hole and the outer surface of the stem to form a stem coupled to the valve body, the hermetic structure, the stem hole formed in the valve body An airtight ring for seating so as to be in contact with the seat body of the valve seat coupled to the valve body therein; a pressure ring positioned outside the airtight ring to press the airtight ring in an inward and an outward direction of the stem hole; Teflon ring for finally blocking the fluid leakage in the stem direction through the outer side of the ring, and a pressure spring for generating a pressing force interposed between the Teflon ring and the packing gland, the fluid having a chemical characteristic is the stem hole direction To prevent damage to the upper part of the valve body and stem made of metal by blocking the original leak This is possible.

According to the present invention, even if a fluid having a chemical property is circulated, a gastight means for preventing a fluid from leaking between a stem and a stem for coupling a stem to a valve body is provided to increase the durability of the valve and ensure safety while prolonging its life. It is an invention having various effects, such as to improve the controllability of the valve while making it possible to reduce maintenance and repair costs.

1 is a perspective view showing an exploded state of a Teflon liner butterfly valve for explaining the present invention.
Figure 2 is an exploded perspective view showing an extract of the airtight structure for the Teflon liner butterfly valve to which the technique of the present invention is applied.
Figure 3 is a cross-sectional view of the coupling state showing the airtight structure for the Teflon liner butterfly valve to which the technique of the present invention is applied.
Figure 4 is a schematic view of the operation state of the airtight structure for the Teflon liner butterfly valve to which the technique of the present invention is applied.
Figure 5 is a block diagram showing the airtight holding structure for the Teflon liner butterfly valve to which the prior art is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an exploded state of the Teflon liner butterfly valve for explaining the present invention, Figure 2 is an exploded perspective view showing an airtight structure for the Teflon liner butterfly valve to which the technique of the present invention is applied; 3 is a cross-sectional view showing a state of engagement of the Teflon liner butterfly valve airtight structure to which the technique of the present invention is applied, Figure 4 is an excerpt of the operating state of the airtight structure for Teflon liner butterfly valve applied the technique of the present invention It demonstrates together as a block diagram.

The Teflon liner butterfly valve 100 capable of responding to a fluid having chemical properties is provided with a valve body 105 that is divided into an upper body 101 and a lower body 102 and disassembled and assembled by a bolt 103. do.

The stem body 106 is formed on the upper and lower sides of the valve body 105 to couple the stem 109 protruding upward and downward of the disk 108 having the Teflon 107 attached to the surface thereof. The inner diameter surface of the body 105 is connected to the Teflon 107 of the disk 108 to couple the valve seat 110 of the ring shape to maintain the airtight and chemical resistance.

The valve seat 110 is configured by attaching the Teflon 112 to the outer surface of the seat body 111 is provided with a rubber material to maintain the seat shape and to increase the bonding force with the valve body 105 while having elasticity.

In the present invention, an improved hermetic structure 115 for preventing fluid from leaking through the stem hole 106 and the outer surface of the stem 109 formed to couple the stem 109 to the valve body 105 is provided. It is provided to prevent the fluid having the chemical properties to leak to the upper or lower side of the valve body 105.

The airtight structure 115 may include an outer surface of the seat body 111 of the valve seat 100 coupled to the valve body 105 in the stem hole 106 formed at the upper and lower sides of the valve body 105. An airtight ring 116, which can be connected to the upper and lower directions of the seat body when viewed from the upper and lower stem holes, is seated, and an airtight ring 116 is formed outside the airtight ring 116 to the stem hole 106. The pressing ring 117 for pressing in the inward direction (stem direction) and the outward direction (inner wall direction of the stem hole) of () is located.

An outer side of the pressure ring 117 is interposed between the teflon ring 118 so as to finally prevent the leakage of fluid in the direction of the stem 109 that may occur, the upper side of the teflon ring 118 ( Combining the 120 to always press the pressure ring 117 and the airtight ring 116.
The upper side of the pressure spring 120, the airtight ring 116, the pressure ring 117, Teflon ring 118 and the airtight structure consisting of the pressure spring 120 is prevented from being separated while the fluid leaks The upper end of the upper buddy 101 to the packing gland 119 by a fixing means such as a bolt to the upper end, and the upper or lower side of the pressure spring 120 may be interposed a bushing ring.

The hermetic ring 116 has a cylindrical ring body 122 formed with a stem hole 121 to allow the stem 109 to pass through the center, and a pressure ring 117 on an upper surface of the ring body 122. It forms a connection surface 123 that can be connected to).

The connecting surface 123 is formed to be inclined from the upper inner side to the lower outer side so as to receive the force of the pressure ring 117 to be distributed to the inner side 124 and the outer side 125 of the lower end of the ring body 122.

Of course, when the inclination of the contact surface 123 is maintained at 45 °, the force transmitted to the inner bottom 124 and outer 125 of the ring body 122 is uniform, the inclination from the upper inner to the lower outer direction Is less than 45 °, the force transmitted in the direction of the outer 125 is increased, on the contrary, when the inclination from the upper inner side to the lower outer direction is greater than 45 °, the force transmitted in the direction of the inner 124 is increased, thereby maintaining airtightness. Of course, the angle can be changed depending on the form.

The hermetic ring 116 is made of Teflon or an elastic material having chemical resistance, and a fluid having chemical properties by forming a Teflon layer 130 on the outer surface of the stem 109 at a position in contact with the hermetic ring 116. The stem hole 106 and the stem 109 are prevented from leaking to the upper portion of the valve 100 so that the corrosion concerns on the upper side of the valve body 105 can be eliminated, and the pressure ring 117 is an airtight ring 116. As such, it is preferable to configure the metal (preferably stainless) material so as not to interfere with the force of the pressure spring 120.

When using the Teflon liner butterfly valve 100 applied to the technology of the present invention as described above to control the fluid having a chemical characteristic look at the operation relationship to block the leakage of the fluid to the valve body 105 Is the same as

The stem body 109 is accommodated in the inside of the stem hole 106 formed to communicate the seat body 111 and the valve body 105 that constitute the valve seat 110 coupled to the valve body 105. 116 is seated, the pressure ring 117 is located on the outside of the airtight ring 116, the teflon ring 118 is located on the outside of the pressure ring 117 through the pressure spring 120 through. After finishing with the packing gland 119 to maintain the airtight structure (115).

In this state, even if a fluid having chemical properties is about to flow in the airtight structure 115, the pressure spring 120 always presses the Teflon ring 118 and the pressure ring 117, and this force is transmitted to the airtight ring 116. It is inverted so that the bottom inner side 124 and the outer side 125 of the hermetic ring 116 are in close contact with the outer surface of the stem 109 and the inner wall surface of the stem hole 106 to prevent leakage to the upper layer of the hermetic ring 116. .

That is, the hermetic ring 116 is made of Teflon or an elastic material having chemical resistance, and has a chemical property by forming a Teflon layer 130 on the outer surface of the stem 109 at a position in contact with the hermetic ring 116. Even if the fluid comes into contact, corrosion-causing phenomena can be prevented.

In particular, when the force of the pressure spring 120 is transmitted to the hermetic ring 116 through the pressure ring 117, the contact surface 123 of the pressure ring 117 and the hermetic ring 116 is in an inclined state. By varying the degree of inclination of the contact surface 123, it is possible to further push the airtight ring 116 toward the outer surface direction of the stem 109 or the inner wall surface direction of the stem hole 106, so that the characteristics of the fluid and the fluid leak The pressing force of the hermetic ring 116 can be effectively and properly adjusted according to the direction in which the airtight ring 116 is maintained to maintain an optimum hermetic state.

In addition, even if wear of the airtight ring 116 or wear of the airtight ring 116 and the contact surface 123 of the pressure ring 117, the pressure spring 120 expands by the amount of wear and is always pressurized to the same pressure. The necessary pressure is to maintain the same state as the initial.

The present invention has the advantage of preventing the fluid having a chemical property to leak in the direction of the stem hole to prevent damage to the upper portion of the valve body and the stem consisting of metal inherently has the advantage of improving the durability and quality of the valve.

100; valve
101; Valve body
102; disk
103; Stem
110; Airtight structure
111; Airtight ring
112; Pressure ring
114; Pressurized spring
117; Junction

Claims (3)

A valve body divided into upper bodies and lower bodies and disassembled and assembled into bolts;
A stem hole formed at an upper side and a lower side of the valve body so as to couple a stem projecting upward and downward of a disk having Teflon attached to a surface thereof;
An inner diameter surface of the valve body is connected to the teflon of the disk and the valve seat of the ring-type coupled to maintain the airtight and chemical resistance;
The valve seat and the seat body is provided with a rubber material to maintain the shape and increase the coupling force with the valve body while having elasticity;
A teflon liner butterfly valve configured to attach a teflon to an outer surface of the seat body to correspond to a fluid having chemical properties;
Providing an improved hermetic structure for preventing the fluid from leaking upward through the stem hole and the outer surface of the stem, the stem body being configured to couple the stem to the valve body;
The hermetic structure includes: an hermetic ring configured to be seated to be connected to the seat body of the valve seat coupled to the valve body in the stem hole formed in the valve body;
A pressure ring positioned outside the airtight ring to press the airtight ring in an inward direction and an outward direction of the stem hole;
Teflon ring for final blocking the leakage of the fluid in the stem direction through the outside of the pressure ring;
The airtight structure for the valve, characterized in that the coupling to the upper side of the Teflon ring is coupled to the pressure spring for joining the Teflon ring and the pressure ring and the airtight ring is fixed to the upper body and closed with a packing gland. The method of claim 1, further comprising:
An upper surface of the hermetic ring to form a connection surface to be in contact with the pressure ring;
The connecting surface is formed to be inclined from the upper inner side to the lower outer side so as to receive the force of the pressing ring and to distribute the inner and outer sides of the lower end of the pressing ring;
The airtight structure of the valve, characterized in that the angle of the contact surface to be able to vary the angle in accordance with the shape to maintain the airtight. The method of claim 1, further comprising:
The hermetic ring is made of Teflon or an elastic material having chemical resistance;
And a teflon layer further formed on an outer surface of the stem at a position in contact with the hermetic ring.

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