KR101579205B1

KR101579205B1 - Valve sealing system

Info

Publication number: KR101579205B1
Application number: KR1020140091870A
Authority: KR
Inventors: 김연태; 우일국; 김상명; 김인일; 정낙신; 박민선
Original assignee: 대우조선해양 주식회사
Priority date: 2014-07-21
Filing date: 2014-07-21
Publication date: 2016-01-04

Abstract

The present invention relates to a valve sealing system (180) in a ball valve wherein a hollow ball (110) is inserted into a ball housing of a valve and the ball (110) rotates with the operation of a handle consisting a flange (150) and a stem (170) to open or close a flow passage. The valve sealing system (180) comprises: an O-ring (182) installed on a first groove (181) to primarily prevent fluid leakage between the stem (170) and a stem cover (172); and a refractory sealing member (184) installed on a second groove (183) to secondarily prevent fluid leakage from the O-ring (182). The valve sealing system is characterized by having a flow passage (185) between the first groove (181) and the second groove (183) to allow the leaked fluid to flow from the O-ring (182), and a pressing means (186) installed on the second groove (182) to prevent the leakage of the fluid leaked from the O-ring (182) by delivering the pressure by the fluid introduced through the flow passage (185) to the refractory sealing member (184). According to the present invention, the valve sealing system can effectively seal a space between the stem and the stem cover even in case the O-ring is not able to seal the space.

Description

{Valve sealing system}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve sealing system, and more particularly, to a valve sealing system capable of performing a sealing function even more effectively under high pressure conditions.

As shown in FIG. 1, a ball valve is formed by inserting a ball 110 penetrating the inside of a ball housing of a valve, and by operating a handle composed of an operation flange 150 and a stem 170 And the ball 110 is rotated to open and close the flow path. Such a ball valve is advantageous in that the flow direction and the flow direction of the fluid are the same, the diameter of the penetration portion of the ball inside the valve is almost the same as the diameter of the valve, there is almost no pressure loss, and the valve is opened and closed at 90 °. These ball valves are suitable for blocking medium and high pressure piping.

On the other hand, in the ball valve, a valve sealing system 180 is installed to prevent fluid leakage between the stem 170 and the stem cover 172, as shown in FIGS. That is, in order to prevent fluid leakage, the first groove 181 is provided with an O-ring 182, the O-ring 182 does not function due to wear or fire, The second groove 183 is provided with a refractory sealing member 184, which is a refractory material, in order to prevent leakage of the fluid from the second groove 183.

However, when sealing between the part A and the part B, that is, between the stem 170 and the stem cover 172 through the conventional valve sealing system 180, the sealing function may deteriorate under a high pressure condition.

1, reference numeral 120 denotes a ball support, 130 denotes a body, 140 denotes a flange, and 160 denotes a seat retainer.

As a related art patented technology, as shown in FIG. 3, in a sealing structure of a Trunnion type ball valve that can prevent leakage of fluid even in the event of a fire. (2) for preventing the fluid from leaking to the outside through the body (4) during operation of the ball, and a seat ring A sheet retainer 3, a sheet inserter 6 and a graphite 9 positioned between the body and preventing leakage of fluid during a fire, A space ring 10 positioned between the retainer 3 and the seat insulator 6 to prevent leakage of the fluid and the space ring and the graphite 9 are pressed by the elastic force of the spring 7, A spring 7 having an elastic force capable of preventing leakage of fluid by bringing the sheet retainer 3 and the sheet stirrer 6 into close contact with the ball side, The seat retainer 3 and the seat inserter 6 are moved to the ball side A spring holder 8 for fixing the spring to be pushed to the seat cage 3, an O-ring 5 between the seat cage 3 and the body for preventing the leakage of the fluid, and sealing means for sealing the ball valve And a body 4 of a trunnion-type ball valve (see Patent Document 1).

Korean Patent Laid-Open No. 10-2003-0071724

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a valve sealing system capable of more effectively sealing between a stem and a stem cover under high-pressure conditions.

In order to achieve the above object, a valve sealing system according to the present invention is a valve sealing system in which a ball penetrating the inside of a ball housing of a valve is inserted, and a ball is rotated by operating a handle including an operating flange and a stem, An o-ring provided in the first groove and a refractory seal provided in the second groove to prevent leakage of the fluid leaking from the o-ring in order to primarily prevent fluid leakage between the stem and the stem cover. Wherein a flow path is formed between the first groove and the second groove so that the fluid leaking from the O-ring can flow into the second groove, and the second groove The hydraulic pressure by the fluid flowing through the flow path is transmitted to the refractory sealing member It characterized in that the pressure means for preventing the leakage of the fluid from leaking from the group O-ring is installed.

Here, the refractory sealing member may be composed of graphite.

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According to the present invention, even if the O-ring can not normally perform the sealing function, the sealing function between the stem and the stem cover can be effectively performed.

1 is a conceptual view of a general ball valve.
2 is a conceptual view of a valve sealing system applied to Fig.
3 is a conceptual view of a sealing structure of a Trunnion type ball valve.
4 is a conceptual view of a valve sealing system according to the present invention.
5 is a use state view of a valve sealing system according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the same parts as those of the prior art will be described with reference to the conventional drawings.

FIG. 4 is a conceptual view of a valve sealing system according to the present invention, and FIG. 5 is a use state view of a valve sealing system according to the present invention.

The valve sealing system according to the present invention is configured to perform a sealing function more effectively between a stem and a stem cover under a high pressure condition.

As shown in the drawing, the valve sealing system 180 according to the present invention basically includes an O-ring (not shown) installed in the first groove 181 for primarily preventing fluid leakage in a valve that opens and closes a fluid passage, And a refractory sealing member 184 installed on the second groove 183 to prevent leakage of the fluid leaking from the O-ring 182.

Here, the refractory sealing member 184 may be made of graphite or the like having excellent heat resistance, thermal shock resistance, corrosion resistance, and the like.

The valve sealing system 180 according to the present invention is particularly effective when the fluid leaked from the O-ring 182 flows into the second groove 183 between the first groove 181 and the second groove 183 And the second groove 182 is connected to the refractory sealing member 184 by the hydraulic fluid flowing through the oil passage 185 so that the oil is supplied from the O- A pressure means 186 is provided to more effectively prevent leakage of the leaked fluid.

That is, the O-ring 182 is further provided with the oil passage 185 and the pressing means 186 such as a plate so that the O-ring 182 can normally perform the sealing function even when the O-ring 182 can not normally perform the sealing function due to wear or fire.

Now, the operation of the valve sealing system 180 according to the present invention will be described with reference to Fig.

First, when the O-ring 182 fails to perform a sealing function normally due to abrasion, fire, or the like, the leaked fluid flows into the flow path 185, and the hydraulic pressure generated by the flowing fluid is refracted by the action of the pressure means 186 So that the sealing member 184 is pressed. Thus, Part A and Part B, that is, between the stem and the stem cover can serve as effective sealing.

Particularly, as the high-pressure condition becomes, the pressing means 186 presses the refractory sealing member 184 to a larger pressure, so that it can perform a sealing function very effectively.

While the valve sealing system according to the present invention has been described in terms of a limited number of embodiments, it is to be understood that the scope of the present invention is not limited to the specific embodiments, Alternatives, modifications, and alterations may be made.

Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

110: Ball 120: Ball support
130: body 140: flange
150: operator flange 160: seat retainer
170: Stem 172: Stem cover
180: valve sealing system 181: first groove
182: O-ring 183: Second groove
184: Refractory sealing member 185:
186: Pressurizing means

Claims

A ball 110 is inserted into the ball housing of the valve and the ball 110 is rotated by the operation of the operating flange 150 and the stem 170 to open and close the flow path. In order to primarily prevent fluid leakage between the stem 170 and the stem cover 172, an O-ring 182 provided in the first groove 181 and a second O-ring 182 to prevent leakage of the fluid leaking from the O- A valve sealing system (180) comprising a refractory sealing member (184) installed in a second groove (183)
A flow path 185 is formed between the first groove 181 and the second groove 183 to allow the fluid leaked from the O-ring 182 to flow into the second groove 183,
A hydraulic pressure generated by the fluid flowing through the oil passage 185 is transmitted to the refractory sealing member 184 in the second groove 183 so as to prevent the leakage of the fluid leaking from the O- ) Is mounted on the valve body (10).

The method according to claim 1,
Wherein the refractory sealing member (184) is comprised of graphite.

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