KR101594786B1 - Graphite yarn bonnet gasket - Google Patents

Abstract

The present invention relates to a graphite yarn bonnet gasket. The graphite yarn bonnet gasket improves a graphite bonnet gasket mounted in a valve device of a power generation facility to prevent graphite from being extruded and reduce pressure of a contact surface to improve sealing properties of the bonnet gasket. According to the present invention, the graphite yarn bonnet gasket comprises: graphite yarn formed by reinforcing the graphite with an inconel wire; and a reinforcement material braiding the graphite yarn to have a thin band shape. The present invention has a technical idea that the reinforcement material is compressed and molded on an upper surface and a lower surface to be integrated with the bonnet gasket.

Description

Graphite yarn bonnet gasket < RTI ID = 0.0 >

The present invention relates to a graphite yam bonnet gasket, and more particularly, to a graphite yam bonnet gasket which is improved in graphite bonnet gasket mounted on a valve device of a power generation facility to prevent extrusion phenomenon of graphite and reduce contact surface pressure to improve sealing performance of a bonnet gasket. Lt; / RTI >

Generally, it is sandwiched between two pipes of a pipe for transferring various kinds of fluid such as a chemical plant, a hydraulic pipe, a heat exchanger, a pressure pipe, a gas main pipe, a valve lid and a pump, Gaskets are used to prevent foreign substances from entering the inside of the pipe. These gaskets can be used in various kinds depending on the application, the shape and the inner diameter of the flange, the type of fluid flowing through the pipe, In particular, a bonnet gasket is mounted between the bonnet and the body of the ultra high-pressure valve in the power plant to prevent leakage of the valve stuffing box.

The valve bonnet used in the high temperature and high pressure environment uses a graphitic bonnet gasket with low corrosion resistance and high heat resistance. In the relation between the valve bonnet and the valve body, not only the pressure of the working fluid, , The bonnet gasket is subjected to the upper, lower, left, and right pressures, so that the bonnet gasket is damaged.

In the prior art Registration Practical Utility Model No. 20-0395564 entitled " Packing Assembly for Valve Stem ", a cap is capped on the bonnet gasket to compensate for the graphite extrusion phenomenon occurring at the corners of the graphite gasket and the metal pad portion. Shaped metal to reinforce it. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional metal cap type bonnet gasket, wherein FIG. 1A is a sectional view of the bonnet gasket, and FIG. 1B is a perspective view of the bonnet gasket.

As shown in FIG. 1 (a), a general bonnet-type valve structure includes a space ring 40 for sealing the bonnet gasket 30 in addition to the valve bonnet 10 and the valve body 20, When the bolt located above the valve bonnet 30 is locked using the gland ring 50, the space ring 40 and the gland ring 50 are pressed against each other when the valve bonnet 30 is moved upward, And then the bonnet gasket 30 is spread in the lateral direction to ensure airtightness. 1 (b), the bonnet gasket 30 in the form of a metal cap 60 has a sealing ability not only by the material itself but also by covering a portion of the graphite material portion having the sealing ability, Thereby increasing the contact surface pressure and increasing the pressure applied to the bonnet gasket 30 itself.

In order to solve the problems of the prior art as described above, the present invention has been made by knitting a graphite yarn reinforced with an inconel wire into a thin band shape and pressing it up and down under a graphitic bonnet gasket by high- And it is an object to improve the sealing ability by reducing the contact surface pressure by integrating.

Another object of the present invention is to provide a bonnet gasket having a structure with a thinly braided graphite yarn reinforced with Inconel wire having a self-sealing ability and having excellent structure and excellent flexibility and high extrusion resistance and heat resistance .

The above object of the present invention is also achieved by a bonnet gasket comprising graphite yarn formed by reinforcing graphite with Inconel wire and reinforcing material braided in the form of a thin strip of graphite yarn, And is integrated with the bonnet gasket by compression molding.

Thus, the graphite yam bonnet gasket of the present invention has the effect of improving the sealing ability of the gasket by reducing the pressure received per unit area of the gasket material by increasing the sealing area of the graphite material having the sealing ability.

Further, by using graphite yarn reinforced with Inconel wire in a graphite material, both of the characteristics of Inconel and the graphite material are possessed, so that they have high heat resistance, dense structure, excellent flexibility and high compression resistance , The reinforcing material is impregnated with fluorine resin to reduce the corrosion resistance and the wear of the valve body, so that the reinforcing material itself has sealing ability.

1 is a view showing a conventional metal cap type bonnet gasket,
2 is an enlarged cross-sectional view of a graphite yam bonnet gasket according to the present invention,
FIG. 3 is a view showing a manufacturing process of a reinforcing material applied to a graphite yarn bonnet gasket according to the present invention,
4 is a graph showing a graphite yarn reinforcement applied to a graphite yarn bonnet gasket according to the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a graphite jacketed jacket, and more particularly, to a graphite jacketed jacket of the present invention, Fig. 2 to 4, the graphite yam bonnet gasket 100 of the present invention is used for a valve bonnet 10 used in a high temperature and high pressure environment and a bonnet gasket 30 applied to the valve body 20 The graphite yarn 110 is formed by reinforcing graphite with Inconel wire and a reinforcing material 120 formed by braiding the graphite yarn 110. The reinforcing material 120 is attached to the upper surface of the bonnet gasket 30 And is integrally formed with the bonnet gasket (30) by compression molding.

The graphite yarn 110 is formed by reinforcing graphite material with Inconel wire to increase the tensile strength of the bonnet gasket 30.

3, the reinforcing material 120 is formed by braiding the core portion of the graphite yarn 110 with the lubricant resin 130, and then the lubricant resin 130 is removed (b) (C), and finally formed into a thin band shape. Due to the braided structure, the stiffener 120 has a fine structure, is excellent in flexibility, has a high pressure resistance, is in a high temperature and high pressure environment Available.

The structure of the general bonnet type valve (see FIG. 1) uses a space ring 40 and a gland ring 50 to seal the bonnet gasket 30, and is provided above the valve bonnet 10 The valve bonnet 10 moves in the direction B when the bolt is moved in the direction A and the bolt is released. When the bolt is locked and pressed, the space ring 40 and the gland ring 50 are pressed in the longitudinal direction and then the bonnet gasket 30 is spread in the lateral direction to secure the airtightness to the clearance between the valve bonnet 10 and the valve body 20.

Therefore, there may occur a problem that the gap portion subjected to the contact surface pressure is vulnerable to the extrusion phenomenon, so that extrusion occurs in which the graphite is damaged or leaks to the gap portion. In the graphite yarn bonnet By applying the gasket 100, the above problem can be effectively improved.

Preferably, the reinforcing material 120 is formed by reinforcing a material (metal) having a tensile strength and a wear resistance to a material (non-metal) having a low corrosivity and a high heat resistance.

The reinforcing material 120 is impregnated with PTFE (refer to "A" in FIG. 3) to reduce the corrosion resistance and wear of the valve body 20.

The graphitic jacket type bonnet gasket of the present invention is a graphitic jacket type graphite jacket in which a graphitic bonnet gasket 30 is pressed against graphite in order to compensate for the graphite extrusion phenomenon occurring at the corner portion of the gasket and the metallic pad portion by the pressure, Unlike the conventional method (see FIG. 1) in which the metal cap 40 is reinforced by covering the upper portion and the lower portion of the bonnet gasket 30, the reinforcing member 120 does not greatly affect the existing sealing portion, Since the reinforcing member 120 itself has a sealing property, the reinforcing member 120 is included in the sealing portion up to the side of the reinforcing member 120, so that the cross-section exhibiting the actual sealing performance is increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

100: graphite yarn Bonnet gasket 110: graphite yarn
120: stiffener 130: lubricating resin

Claims (3)

In the bonnet gasket,
Graphite yarn formed by reinforcing graphite with Inconel wire and
And a reinforcing material braiding the graphite yarn in the form of a thin strip.
The reinforcing member is integrally formed on the bonnet gasket by compression-molding the reinforcing member on the upper and lower surfaces of the bonnet gasket,
Wherein the reinforcing material is a thin strip-shaped knitted fabric formed by compressing and forming the core portion of the graphite yarn after forming a lubricating resin and then removing the lubricating resin, and impregnating the reinforcing material with a fluorine resin. Bonnet gasket.








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