KR101741482B1 - Floating-type ball valve with operation-relief structure in the closed state - Google Patents

Abstract

A disclosed floating-type ball valve having an operating force relieving structure in a closed state comprises: a valve body having a pipe path communicating with pipe bodies connected with both sides thereof; an opening and closing ball installed to be rotated in the valve body, and having a penetration hole for transferring an operation fluid; a stem connected with the opening and closing ball, and rotating the opening and closing ball; and a ball seat unit disposed in the valve body, provided as a position having the opening and closing ball closely placed thereon to prevent the operation fluid from being transferred, and having at least part formed to be separated from the opening and closing ball in a direction facing the center of the pipe path from one end which is disposed at the farthest position from the center of the pipe path in a direction which is vertical to a transferring direction of the operation fluid.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a floating-type ball valve having an operation-

Disclosure of the Invention The present invention relates to a floating type ball valve, and more particularly, to a floating type ball valve having a structure capable of mitigating an increase in operating force due to a biasing force of a working fluid in a closed state.

Herein, the background art relating to the present invention is provided, and they are not necessarily referred to as known arts.

BACKGROUND ART [0002] Generally, a valve assembly is installed in a flow path through which a fluid flows to control a flow direction and a flow rate of a fluid. As the type of a valve body constituting the valve assembly, there are a ball valve, a globe valve, a plug valve and a gate valve.

A ball valve has a structure in which a ball penetrating the inside of a valve body of a valve body is inserted and the ball is rotated by the operation of a handle to open and close the flow passage.

Such a ball valve is divided into a floating type and a trunnion type.

In the Trunnion type, since the ball is fixed on both sides in the direction of the rotation axis, there is no movement of the ball, so even if the pressure difference increases on both sides of the ball in the closed state, the change in the operation force for rotating the ball is not large.

However, in the case of the floating type, since the ball is pushed to the rear side or the downstream side by the upstream side inflow pressure to facilitate the sealing, when the pressure in one direction (unbalance) occurs in the closed state, And the operating force continues to increase as the pressure used gradually increases.

Such an increase in the operating force may also cause malfunction of the operating handle or may cause musculoskeletal injury by an unreasonable operation of the operator for operating the valve.

BACKGROUND ART [0002] As a background art relating to a ball valve, Korean Patent Laid-Open Publication No. 10-2015-0143969 and Korean Patent Registration No. 10-1289873 are exemplified.

1. Korean Patent Publication No. 10-2015-0143969 2. Korean Patent Registration No. 10-1289873

DISCLOSURE OF THE INVENTION The object of the present invention is to provide a floating type ball valve having a structure capable of mitigating the increase in operating force due to the unbalance of the working fluid in the closed state.

The present invention is not intended to be exhaustive or to limit the scope of the present invention to the full scope of the present invention. of its features).

In order to solve the above problems, a floating type ball valve having an operation force reducing structure in a closed state according to an aspect of the present invention includes: a valve body having a conduit for communicating a conduit connected to both sides; An opening / closing ball provided rotatably inside the valve body and having a through hole through which a working fluid is transferred; A stem connected to the open / close ball to rotate the open / close ball; And a valve body disposed inside the valve body and provided at a position where the opening and closing ball is closely contacted to block the transfer of the working fluid and is located farthest from the center of the pipe in a direction orthogonal to the transfer direction of the working fluid And at least a part of the ball seat unit being spaced apart from the open / close ball in a direction from the one end toward the center of the pipe.

In a floating type ball valve having an operation force reducing structure in a closed state according to an aspect of the present invention, the working fluid may be introduced into a space between the opening and closing ball and the ball seat unit in a closed state .

In a floating type ball valve having an operation force reducing structure in a closed state according to an aspect of the present invention, the ball seat unit is provided in an annular shape having a predetermined width, and is located at a position relatively close to the center of the pipe An inner contact portion having an annular contact surface which is formed in a shape corresponding to the outer surface of the opening and closing ball and which is in close contact with the opening and closing ball and is located outside the inner contacting portion from the center of the pipe, And an outer spacing portion having a spacing that is spaced apart from the outer surface of the outer spacing portion.

In a floating type ball valve having an operation force reducing structure in a closed state according to an aspect of the present invention, the inner contacting portion and the outer separating portion may be integrally provided.

In a floating type ball valve having an operation force reducing structure in a closed state according to an aspect of the present invention, the outer spacing portion may be provided such that the spacing portion is provided in an annular shape.

In a floating type ball valve having an operation force reducing structure in a closed state according to an aspect of the present invention, the close contact surface is provided with a curved surface having the same curvature as that of the open / close ball, And the gap between the gap and the opening / closing ball gradually increases in a direction away from the center of the pipe.

In a floating type ball valve having an operation force reducing structure in a closed state according to an aspect of the present invention, the inner contacting portion and the outer separating portion are provided separately, and either one of the inner contacting portion and the outer separating portion The valve body may be integrally formed with the valve body as part of the valve body and the other may be provided by being fastened to the valve body and fixed.

In a floating type ball valve having an operation force reducing structure in a closed state according to an aspect of the present invention, an annular inserting portion having a width set in a direction away from the center of the pipe between the inner contacting portion and the outer separating portion, And an elastic member inserted in the insertion groove and protruding toward the outer surface of the opening and closing ball and elastically deformed in contact with the opening and closing ball.

According to the present invention, by using the shape of the ball seat unit, the working fluid can be introduced between the ball seat unit and the open / close ball in the closed state, so that as the offset pressure increases in the closed state, The effect of reducing the adhesion of the ball seat unit can be obtained.

According to the present invention, since the elastic member is provided between the outer spacing portion and the inner contacting portion of the ball seat unit, the contact state of the inner contacting portion and the opening / closing ball is stably maintained by the pressure of the working fluid flowing between the ball seat unit and the opening- .

1 is a view showing a closed state of a floating type ball valve having an operation force reducing structure in a closed state according to a first embodiment of the present invention;
2 is a view showing a closed state of a floating type ball valve having an operation force reducing structure in a closed state according to a second embodiment of the present invention;
3 is a view showing a floating type ball valve having an operation force reducing structure in a closed state according to a third embodiment of the present invention.
Fig. 4 shows a closed state of Fig. 3; Fig.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a floating type ball valve having an operation force reducing structure in a closed state according to the present invention will be described in detail with reference to the drawings.

It is to be understood, however, that the scope of the present invention is not limited to the embodiments described below, and those skilled in the art of the present invention, other than the scope of the present invention, It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

In addition, the terms used below are selected for convenience of explanation. Therefore, the technical meaning of the present invention should not be limited to the prior meaning, but should be properly interpreted in accordance with the technical idea of the present invention.

1 is a view showing a closed state of a floating type ball valve having an operation force reducing structure in a closed state according to the first embodiment of the present invention.

1, a floating type ball valve 100 having an operation force reducing structure in a closed state according to the present embodiment includes a valve body 110, an opening and closing ball 120, a stem 130, and a ball seat unit 140 ).

Here, when the ball valve 100 is in the closed state, the operation force is relaxed by the contact state between the opening and closing ball 120 and the ball seat unit 140.

The valve body 110 forms an outer surface of the ball valve 100 and functions as a base to which the opening and closing ball 120, the stem 130 and the ball seat unit 140 are coupled or formed.

The valve body 110 has a conduit 111 that communicates with the conduits connected to both sides, and may be formed of a synthetic resin (e.g., polyethylene resin) or a metal material.

The opening and closing ball 120 has a through hole 121 rotatably installed inside the valve body 110 and through which the working fluid is transferred.

The working fluid may be either fluid or gas.

The through holes 121 communicate or block the tubular bodies connected to both sides of the valve body 110 as the opening and closing ball 120 rotates.

The opening and closing ball 120 may be made of a synthetic resin (e.g., polypropylene resin) or a metal material.

The opening and closing ball 120 has a stem 130 at an upper portion in a direction orthogonal to the longitudinal direction of the through hole 121 and a lower portion supported by an inner bottom surface of the valve body 110.

Here, the engagement between the opening and closing ball 120 and the stem 130 has a clearance and is engaged to enable relative movement.

The stem 130 is connected to the opening and closing ball 120 to rotate the opening and closing ball 120. An operation lever (not shown) may be provided to rotate the stem from the outside.

The ball seat unit 140 is configured such that the opening and closing ball 120 flows and selectively closes to block the transfer of the working fluid.

The ball seat unit 140 is disposed inside the valve body 110 and is provided with a seat in which the opening and closing ball 120 is closely contacted to block the transfer of working fluid.

At least a part of the ball seat unit 140 is spaced apart from the opening / closing ball 120 in a direction toward the center of the duct from one end located farthest from the center 111c of the duct in a direction orthogonal to the transporting direction of the working fluid Respectively.

Here, the working fluid flows into the space between the opening / closing ball 120 and the ball seat unit 140 in the closed state.

Thus, when the offset pressure due to the working fluid increases in the closed state, the working fluid introduced into the space between the opening and closing ball 120 and the ball seat unit 140 presses the ball seat unit 140, And the ball seat unit 140 can be relaxed.

As a result, the torque required for the operation force, i.e., the rotation of the stem 130, is reduced.

On the other hand, in the state where the bias pressure is small, since the force of the working fluid flowing into the space between the opening and closing ball 120 and the ball seat unit 140 is relatively weak to push the ball seat unit 140, The contact with the unit 140 is prevented from being released.

Here, the size of the spaced portion between the opening and closing ball 120 and the ball seat unit 140 may be appropriately selected by a designer.

In this embodiment, the ball seat unit 140 is provided in an annular shape having a predetermined width, and the inner contact portion 141 and the outer spacing portion 142 are arranged in order from the center thereof in the radial direction.

Here, the center of the ball seat unit 140 is arranged to be the same as the center 111c of the channel.

The inner contact portion 141 is located at a position relatively close to the center 111c of the pipe and is provided in a shape corresponding to the outer surface of the opening and closing ball 120 and is an annular close contact surface 141a.

The outer spacing portion 142 is located outside the inner contacting portion 141 from the center 111c of the duct and has a spacing 142a spaced apart from the outer surface of the opening and closing ball 120.

In this embodiment, the inner contact portion 141 and the outer spacing portion 142 are provided integrally.

Alternatively, they may be separately provided and fastened to each other, and this will be described later in the second embodiment.

On the other hand, in the present embodiment, it is preferable that the outer spacing portion 142 is provided with the spacing surface 142a in an annular shape.

Alternatively, the spacing surfaces 142a may not be formed on the entire circumference of the outer spacing portion 142 but may be discretely disposed along the circumference thereof.

In this embodiment, the contact surface 141a is formed as a curved surface having the same curvature as that of the opening and closing ball 120. The spacing surface 142a is formed as a curved surface having a curvature larger than the curvature of the opening and closing ball 120, It is preferable that the interval between the spacing surface 142a and the opening and closing ball 120 is gradually increased in the direction away from the center 111c of the duct.

2 is a view showing a closed state of a floating type ball valve having an operation force reducing structure in a closed state according to a second embodiment of the present invention.

2, a floating type ball valve 200 having an operation force reducing structure in a closed state according to the present embodiment is configured such that the inner contact portion 141 and the outer spacing portion 142 are separated from each other And the rest of the configuration is the same as that of the first embodiment.

Therefore, the same configuration as that of the first embodiment is substituted for the description of the first embodiment, and is omitted here.

In this embodiment, the inner contact 141 and the outer spacer 142 are provided separately, and one of the inner contact 141 and the outer spacer 142 is part of the valve body 110, (So-called 'end') with the valve body 110 and the other is fastened (called 'retainer') to the valve body 110 and fixed.

2, the inner contact 141 is formed as a part of the valve body 110, and the outer spacing 142 is separately provided.

This provides a convenient advantage in inserting the opening and closing ball 120 into the valve body 110 during the manufacturing process.

FIG. 3 is a view showing a floating type ball valve having an operation force reducing structure in a closed state according to a third embodiment of the present invention, and FIG. 4 is a view showing the closed state of FIG.

3 and 4, a floating type ball valve 300 having an operation force reducing structure in the closed state according to the present embodiment is different from the floating type ball valve 300 in that the ball seat unit 140 further includes the elastic member 150 And the other configurations are the same as those of the first embodiment.

Therefore, the same configuration as that of the first embodiment is substituted for the description of the first embodiment, and is omitted here.

In this embodiment, an annular groove 151 is provided between the inner contact 141 and the outer spacing 142 in the direction away from the center 111c of the channel.

The elastic member 150 is inserted into the insertion groove 151 and protrudes toward the outer surface of the opening and closing ball 120 and is elastically deformed in contact with the opening and closing ball 120.

Here, it is preferable that the insertion groove 151 is formed so as not to fit in the elastic deformation state of the elastic member 150 but to have a retreat space that can be filled with the elastic member 150 while being deformed.

If there is no retreat space, permanent deformation (so-called 'burst') may occur due to the elastic member 150 being displaced beyond the elastic deformation limit by the biasing pressure.

The contact state between the inner contact portion 141 and the opening and closing ball 120 can be stably maintained by the pressure of the working fluid introduced between the ball seat unit 140 and the opening and closing ball 120. [

Claims (8)

A valve body having a conduit for communicating a tubular body connected to both sides;
An opening / closing ball provided rotatably inside the valve body and having a through hole through which a working fluid is transferred;
A stem connected to the open / close ball to rotate the open / close ball; And
A valve body disposed inside the valve body and being provided at a position where the opening and closing ball is closely contacted to block the transfer of the working fluid and being located farthest from the center of the pipe in a direction orthogonal to the transfer direction of the working fluid, And at least a part of the ball seat unit being spaced apart from the opening / closing ball in a direction toward the center of the pipe, the ball seat unit having an operation force reducing structure in a closed state,
The ball-
And is provided in a ring shape having a predetermined width,
An inner contact portion located at a position relatively close to the center of the pipe and having an annular contact surface in a shape corresponding to the outer surface of the opening and closing ball and in close contact with the opening and closing ball,
And an outer spacing part located at an outer side of the inner contacting part from the center of the pipe and having a spacing spaced apart from an outer surface of the opening and closing ball,
Wherein the working fluid flows into the outer spacing part between the opening and closing ball and the ball seat unit in a closed state and the operating fluid presses the ball seat unit, Wherein a torque required for rotation of the stem for rotating the opening / closing ball is reduced by mitigating the adhesion force. delete delete The method according to claim 1,
Wherein the inner contacting portion and the outer separating portion are integrally provided. ≪ RTI ID = 0.0 > 1 < / RTI > The method according to claim 1,
Wherein the outer spacing part is provided with an annular shape in a spaced-apart shape. The method according to claim 1,
Wherein the contact surface is provided with a curved surface having the same curvature as that of the opening /
Wherein the spacing surface is a curved surface having a curvature larger than a curvature of the opening / closing ball,
And a gap between the spacing surface and the opening / closing ball gradually increases in a direction away from the center of the pipeline. The method according to claim 1,
Wherein the inner contacting portion and the outer separating portion are provided separately,
Wherein one of the inner contacting portion and the outer leaving portion is formed integrally with the valve body as a part of the valve body and the other is fixed to the valve body and fixed. Floating type ball valve. The method of claim 7,
And an annular groove formed between the inner contacting portion and the outer spacing portion and having a width set in a direction away from the center of the channel,
And an elastic member inserted in the insertion groove and protruding toward the outer surface of the opening and closing ball and being elastically deformed in contact with the opening and closing ball. valve.

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