KR20180096479A - Butterfly valve - Google Patents

Abstract

The present invention relates to a butterfly valve and, more specifically, to a butterfly valve for absorbing a water hammer which prevents water hammer by a rapid inflow of a fluid in a short period of time by filling the fluid while a proper flow enters without a water hammer instead of rapid and excessive filling resulting in a full pipe in an initial start process for filling the fluid when initially filling the fluid by new pipe installation such as a water pipe or filling the fluid in a pipeline by other reasons (repair and inspection), and sets a section where the fluid uniformly flows without a flow change even if a valve disk rotates in a closing direction near total closure of a valve to prevent water hammer by a rapid decrease in kinetic energy of the fluid when closing the valve to obtain an effect just like when temporarily stopping the valve to prevent water hammer.

Description

Butterfly valve -

The present invention relates to a butterfly valve, and more particularly, to a butterfly valve, more specifically, a butterfly valve, which is installed in a water pipe after a valve is installed and is filled with an appropriate flow rate according to an introduction chart at the time of initial filling, thereby mitigating water impact due to excessive inflow of fluid, Even if the valve disc rotates in the closing direction, the interval that flows constantly without changing the flow rate is set to give the same effect as when the valve is temporarily stopped, thereby alleviating the water shock caused by the rapid decrease of kinetic energy The present invention relates to a water-shock-absorbing butterfly valve.

As is well known, a butterfly valve is a valve installed in a conduit for transferring fluids such as tap water or various kinds of industrial water, for controlling and controlling the flow of fluid. The valve body is connected to a piping line. And a valve disk which is rotated by the drive shaft to open and close the pipeline.

The drive shaft receives a rotational force from an opening / closing operation portion provided outside the valve body, and is axially rotated to open / close the valve disk.

The butterfly valve has a valve body seat ring fixed to the inner circumferential surface of a cylindrical valve body, and a disc seat ring is fixed to the outer circumferential surface of a disc-shaped valve disc, The valve disc is rotated at an angle of 90 ° to close the water supply pipe in such a manner that the disc seat ring is brought into contact with the valve seat ring.

Conventionally, when a pipe is installed in a water pipe or the like, or in the process of checking or repairing a piping line, the valve disk of the butterfly valve is rotated to regulate the opening degree. When the fluid is supplied and supplied, the initial sudden and excessive filling When the water supply is full, water hammer generated by excessive inflow may damage the piping or peripheral equipment of the pipe, or the water tightness and airtightness due to the flow action may be reduced. To prevent this, a butterfly valve In the initial state, only small openings, that is, about 4% of the cross-sectional area of the main pipe are opened and closed.

However, in general butterfly valves, when the valve disc is rotated 90 ° in the closed state of the valve, the entire 360 ° of the valve disc is opened. Therefore, when the valve disc 1 ° (about 1/3 turn; The flow rate is difficult to control and it is difficult to precisely control the flow rate and to supply water.

That is, it is difficult to control the correct opening of the appendage at the time of starting the appendage at the beginning, and if a large amount of fluid is supplied at one time, the pipe or the peripheral valve is damaged by the water hammer.

In order to mitigate the water shock due to the rapid decrease of the kinetic energy of the fluid near the valve when the valve is closed, a general butterfly valve is widely used to temporarily stop the valve near the full closing, have.

However, these measures must be carried out by experienced experts and there are also troublesome operations.

For reference, the flow rate in the pipe due to the opening of the butterfly valve is 0.5 m / s or less in the above-described addition process.

Generally, as shown in Fig. 1, first and second auxiliary pipes 3 and 3a are installed in first and second main pipes 2 and 2a provided with a butterfly valve 1, respectively. And an auxiliary valve (4) is provided between the first and second auxiliary pipes (3, 3a).

One end of the first auxiliary pipe 3 is connected to one side of the butterfly valve 1 and the other side of the second auxiliary pipe 3a is connected to the first and second main pipes 2 and 2a as a butterfly An auxiliary valve 4 for opening and closing the first and second auxiliary pipes 3 and 3a is provided in a state of being connected to the other side of the valve 1 and then the first and second main pipes 2 and 2a are provided with butter When the fly valve 1 is closed and the auxiliary valve 4 is opened, the fluid of the first main pipe 2 flows into the second auxiliary pipe 3a through the first auxiliary pipe 3 and flows into the second main pipe 2a, So that it is filled with a small flow rate into the channel of the second main pipe 2a.

In addition, since the diameter of the second auxiliary pipe is set to 1/5 of the diameter of the second main pipe in accordance with normal specifications and the like, the flow path cross-sectional area of the second auxiliary pipe is designed to be 1/25 of the flow path cross-sectional area of the second main pipe use.

However, since the first and second auxiliary pipes and the auxiliary valve are installed in such a manner that the first and second auxiliary pipes are filled with the fluid in the second main pipe, the installation area is enlarged and the first and second auxiliary pipes There is a problem that it is troublesome to further process and control the installation of piping.

2 shows a cited Japanese Utility Model Publication No. 63-168379 entitled " Butterfly Valve ", in which a packing 4 is attached to a rounded end portion 3 provided on the outer periphery of a valve disk, In the butterfly valve having the packing (4) by attaching vacant pressing plates (5a, 5b) to the rounded end (3), the pressure plates (5a, 5b) (Rectifying vane plates) 9 (9, 9) for reducing the negative pressure are provided on one pressing plate and a plurality of rectifying vanes (7, 9) are provided on the other pressing plate so as to be wrapped on the opposed front and rear surfaces. (9a). ≪ / RTI >

The butterfly valve can reduce cavitation by reducing the negative pressure when water passes through the rectifying plate by attaching a rectifying blade to the opposite front and rear surfaces of the disk. However, as the valve opening increases, the flow rate rapidly increases There is a problem that it is difficult to control the flow rate to a certain level.

On the other hand, FIG. 3 discloses a butterfly valve, which is capable of easily and finely adjusting the flow rate in the introduction groove of a valve disc, in which a valve disk The outer peripheral sheet of the valve disc is brought into contact with the inner sheet of the valve body by the rotation of the valve disc, Wherein the valve seat has a first seat portion in which an outer sheet of the valve disk is in close contact with an inner surface sheet of the valve body at a completely closed position of the valve disk, And a second seat portion contacting the inner surface sheet of the valve body when the disk is opened and closed in an introductory section, Wherein the groove is provided with a groove for allowing the opening of the outer end to be closed by the inner surface sheet of the valve body.

Although the butterfly valve has a V-shaped groove structure, the flow rate can be adjusted through the V-shaped groove in the introduction section. However, as the valve opening degree in the introduction section increases, the flow rate and cross- Therefore, it is difficult to adjust to a constant flow rate and to control cavitation by finely adjusting the flow rate in the introduction section. In the initial appendage of the duct, there is a problem that the duct appendage time takes too long due to too small flow rate.

Japanese Patent No. 4266698 entitled " Butterfly Valve " includes a cylindrical valve body connected to a pipe through which a fluid flows, and a valve body rotatably installed inside the valve body to block or allow the flow of fluid through the valve body An O-ring coupled to an outer circumferential surface of a valve disc provided in an inner circumferential portion of the valve body and closing the space between the inner circumferential surface and the outer circumferential surface of the valve body to function as a watertight seal; A shielding film is formed so as to oppose to each other in a symmetrical state, and a long hole is formed in the shielding film so that a fluid can pass therethrough.

When the butterfly valve is rotated at a predetermined angle without rotating the valve disc 90 ° to accommodate the fluid in the pipe, the surface of the blocking membrane 6 is in close contact with the O-ring provided on the inner circumferential surface of the pipe body, (5).

However, when the butterfly valve is opened to introduce the fluid, the flow direction of the fluid passing through the long hole does not flow in the longitudinal direction of the pipe but the fluid passing through the long hole collides with the inner peripheral surface of the valve body, Noise and vibration are generated in the course of the fluid colliding with the valve body due to the phenomenon of flowing in the longitudinal direction of the pipe, and in some cases, fluidity is given to the surrounding components to lower the watertightness and tightness.

Japanese Patent No. 4086495 entitled " Butterfly Valve with Constant Flow Rate Capability " has a disk tail portion provided on the back surface side of the valve disk. The disk tail portion has a circumferential surface sliding on the belt body seal ring, And the other end of which is open to the back side of the valve disc. On the outer circumferential surface, the opposite valve disc side end portion is slid in contact with the valve body seal ring in the introduction of the valve disc The distance between the axial center of the valve disc and the outer peripheral surface of the disc tail portion is larger than the distance from the axial center of the valve disc to the outer circumferential surface of the valve disc, When the valve disk is rotated to the full-closing position, The outer circumference of the disk and the disk tail portion outer peripheral surface and is characterized in that the sliding contact at the same time the valve body sealing.

However, the butterfly valve has a structure in which the flow of the fluid does not flow in the longitudinal direction of the pipe during the appendage process, but flows into the valve body after flowing, which can not solve the problem that the pipe may be broken due to water hammer.

1. JP-A-2002-22034 (Butterfly Valve) 2. Japanese Utility Model Utility Model Publication No. 63-168379 (Butterfly Valve) 3. Japanese Patent Registration No. 4266698 (Butterfly Valve) 4. Japanese Patent No. 4086495 (Butterfly Valve with Constant Flow Rate Capability)

The present invention solves the above-mentioned problems. In order to mitigate water impact when a fluid is introduced through a butterfly valve installed between piping lines, a main pipe having a cross-sectional area of 4% (20 ° opening section) is easy to control. When the valve is closed, the valve opening degree is temporarily stopped by setting the flow rate constant section (opening section of the valve disk 15 to 20 °) near the full closing, And to prevent breakage of the pipeline.

According to an aspect of the present invention, there is provided a valve device comprising: a cylindrical valve body connected to a pipe for supplying a fluid; a valve body rotatably installed inside the valve body to block or allow fluid flow through the valve body; A known butterfly valve coupled to an O-ring, which is coupled to an outer circumferential surface of a valve disc provided on an inner circumferential surface of the valve body and seals between an inner circumferential surface and an outer circumferential surface of the valve body to perform watertight function, A disk wing portion protruding opposite to a front surface and a back surface of the disk in a symmetrical state; and a portion of the periphery of the outer circumferential surface of the disk wing portion passing through the front surface and the back surface side- The valve disc is rotated in the state of the water guide hole arranged in the center of the disc, Portion outer peripheral surface to provide a shock-absorbing can butterfly valve, characterized in that the fluid is flowing through the water flow guide hole has a inclined surface when the opening in the inner peripheral surface of the valve body.

As described above, the butterfly valve according to the present invention rotates a valve disk having a plurality of water guide holes formed in the disk wings formed on the front and rear sides of the valve disk to allow fluid to flow into another pipe, , The flow of the fluid is guided through only the insertion guide hole, and the flow rate of the main flow channel is opened by 4% (valve opening interval of 15 ~ 20 °). There is an effect to mitigate.

In addition, in the present invention, the fluid begins to slowly flow into the water guide guide hole having a structure formed by a plurality of multi-stages for a certain period of time for starting the water guide valve by the butterfly valve, Since the inflow operation is performed, an excessive force is not applied to the valve, the piping line, and the peripheral components thereof, thereby preventing damage and breakage due to water impact.

Further, the present invention has a water impact reduction effect by temporarily stopping the valve opening by a flow rate constant interval (valve disc opening range of 15 to 20 degrees) in the vicinity of the full closing when the valve is closed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exemplary view showing a state in which a secondary piping is installed in a conventional butterfly valve. Fig.
2 is a cross-sectional view showing an embodiment of a butterfly valve disclosed in Japanese Utility Model Laid-Open No. 63-168379.
Fig. 3 is a plan view of a valve body of a butterfly valve disclosed in Japanese Unexamined Patent Application Publication No. 2002-22034 when the valve body is closed.
4 is a plan view showing an operating state of Japanese Patent Publication No. 4266698 (Butterfly Valve).
5 is a cross-sectional view showing a Japanese Patent Registration No. 4086495 (butterfly valve having a constant flow rate addition function).
6 is a product drawing showing the butterfly valve of the present invention.
7 is a sectional view showing the butterfly valve of the present invention.
FIG. 8 is a sectional view of the butterfly valve according to the present invention in use; FIG.
9 is a view showing a butterfly valve according to the present invention in a closed state;
10 is a view showing a state in which the disk of the butterfly valve of the present invention is opened at 0 to 15 degrees.
11 is a view showing a state in which the disk of the butterfly valve of the present invention is opened by 15 to 20 degrees.
12A is a graph showing a valve opening degree flow rate of a conventional valve.
12B is a graph showing the valve opening flow rate of the present invention valve.

In order to prevent the water shock caused by the sudden change of the kinetic energy of the fluid when the valve is opened and closed, it is necessary to set the interval where the valve disc is constantly flowing without fluctuation even if the valve disc is rotated in the open or close direction. to be more specific date and time in accordance with the preferred embodiment of a time sikyeoteul stop with the present to provide the number of shocks (水 衝擊) relief butterfly valves designed to prevent the number of shock given to the effect of invention for the accompanying drawings as follows.

FIG. 6 is a product view showing the butterfly valve of the present invention, and FIG. 7 is a sectional view showing the butterfly valve of the present invention.

The butterfly valve 100 according to the present invention includes a valve body 110 formed in a cylindrical shape and connected to a pipe through which fluid flows, a valve body 110 rotatably installed inside the valve body 110, A valve disc 120 for blocking or allowing the flow of the valve disc 110 and a valve disc 120 installed inside the valve body 110 to close between the inner circumferential surface and the outer circumferential surface of the valve body 110, And an O-ring 150 are combined.

In addition, the disk wing portion 130 protruding opposite to the front face and the back face of the valve disk 120 in a symmetrical state is formed.

A portion of the outer circumferential surface of the disk wing 130 is passed through the front or side of the O-ring 150 provided on the valve disk 120, A hole 130a is formed.

Since the water guide hole 130a passes through the side surface of the valve body 120, the fluid is prevented from flowing into the valve body 110 in a state where the valve disc 120 is closed, When the weir valve disc 120 is rotated at a predetermined angle, the outer circumferential surface of the disc wing 130 is rotated in a state of being closely contacted with the inner circumferential surface of the valve body 110 to induce fluid to flow into the air guide hole 130a .

In addition, in the course of inflow and infusion of the fluid, the inflow guide hole 130a induces the flow of the fluid in the longitudinal direction of the pipe without causing the fluid to hit the inner surface of the valve body 110 and gradually increases the flow rate An inclined surface 140 having a predetermined inclination angle is formed on the inner surface of the apposition guide hole 130a.

The disk wing 130 is preferably formed in a spherical shape convex forward so as to minimize the flow velocity resistance of the fluid.

In addition, when the valve disc 120 is opened at the appurtenant opening degree, it is preferable that the valve disc 120 is opened to 4% of the flow path cross-sectional area of the piping to start the filling.

As described above, the cross-sectional area of the flow is 4% of the cross-sectional area of the flow path, and the increase rate of the flow rate of the valve disc 120 (0 to 15 °) and the flow rate of the flow rate constant 15 to 20 ° Can be adjusted.

8 is a sectional view of the butterfly valve according to the present invention in a state of use.

The valve disk 120 installed inside the valve body 110 for moving the butterfly valve 100 according to the present invention in order to introduce fluid into the pipe and the valve disk 120 passing through the valve body 110 and connected to the center of the valve disk 120 The valve disc 120 rotates so that the air guide hole 130a formed in the disc blade 130 is positioned on the inner circumferential surface of the valve body 110 on both sides of the inner circumferential surface of the valve body 110. [

Therefore, the plurality of air guide holes 130a are formed in a horizontal plane after the inclined surface so that the flow of the fluid is smoothly guided so that the inflow fluid does not collide within the valve body 110 and the fluid flows along the longitudinal direction of the pipe The flow rate can be flowed while maintaining the appropriate flow rate at the predetermined interval.

Fig. 9 is a view showing a butterfly valve according to the present invention in a closed state. In Fig. 9, an O-ring 150 Is kept in close contact with the inner circumferential surface of the valve body 110 to prevent the fluid from flowing.

A stepped portion 170 is formed on the inner peripheral surface of the valve body 110 so as to be in close contact with the O-ring 150 and the disk wing portion 130. Around the stepped portion 170, It is preferable to be formed so as to be inclined so as to be easy.

FIG. 10 is a view showing a state in which the disk of the butterfly valve of the present invention is opened at 0 to 15 degrees. When the outer peripheral surface of the disk wing portion 130 is rotated in a state facing the step portion 170, When the fluid flows into the valve body 110, the fluid flows smoothly in the longitudinal direction of the pipe without colliding directly with the valve body 110. When the valve disc 120 rotates from 0 to 15 degrees, A section where the flow rate gradually increases is formed.

FIG. 11 is a view showing a state in which the disk of the butterfly valve of the present invention is opened by 15 to 20 degrees. When the valve disk 120 rotates from 15 to 20, the outer peripheral surface of the disk- When the fluid flows into the insertion guide hole 130a in a state where it coincides with the end line of the insertion hole 170 and the end line, it induces the fluid to flow smoothly in the longitudinal direction of the pipe, It is easy to adjust the apposite sucking flow rate, and when the valve disc 120 is closed and rotated in a section where the flow rate of the sucking and discharging is constantly rotated from 20 to 15, the valve is temporarily stopped,

12A is a graph showing the valve opening degree flow rate of the conventional valve, and 12B is a graph showing the valve opening degree flow rate of the present invention valve.

As shown in the graph of FIG. 12A, the conventional butterfly valve has a problem that it is difficult to adjust the flow rate to a desired flow rate because the flow rate increases as the opening degree increases because there is no constant flow rate section. However, Since there is a horizontal section after the slope section, the flow rate increase section and the flow rate constant section due to the increase in opening degree are set, and the sectional area of the constant section of the flow rate is set to 4% of the main passage having the proper flow rate passing aperture, The effect of temporarily stopping the flow of the flow due to the flow rate constant section can alleviate noise and water shock.

In the above, the slope section is a flow rate increasing section, the opening degree is in the range of 0 to 15 °, the horizontal section is the flow rate constant section, and the opening degree is in the range of 15 to 20 °.

100: Butterfly valve 110: Valve body
120: valve disc 130: disc wing
130a: an appendix guide hole 140: an inclined surface
150: O-ring 160:
170: step portion 170a: inclined surface

Claims (5)

A cylindrical valve body 110 connected to a pipe for supplying fluid,
A valve disc 120 rotatably installed inside the valve body 110 to block or allow the flow of fluid through the valve body 110,
A known butterfly valve (not shown) coupled to an outer circumferential surface of a valve disc 120 installed in an inner peripheral portion of the valve body 110 and coupled with an O-ring 150, which seals between the inner circumferential surface and the outer circumferential surface of the valve body 110, (100)
A disk wing 130 protruding from the valve disk 120 so as to face each other while being symmetrical with respect to the front and back surfaces of the valve disk 120,
A portion of the circumference of the outer circumferential surface of the disk wing portion 130 is passed through from the front side to the side surface in the vicinity of the O-ring 150b provided on the valve disk 120, 130a are formed,
Wherein an inclined surface (140) for guiding the fluid in a linear direction of the pipe is formed on the inner surface of the water inlet guide hole (130a) to form a flow rate increasing section and a flow rate constant section.
The method according to claim 1,
And has an effect of temporarily stopping the valve opening by a constant flow rate interval when closing the valve disc (120).
The method according to claim 1,
Characterized in that the valve disc (120) is open at 4% of the cross-sectional area of the main conduit in an open state for filling and filling.
The method according to claim 1,
Wherein the number or size of the plurality of the insertion guide holes (130a) corresponding to 4% of the cross-sectional area of the main pipe can be adjusted according to the standard.
The method according to claim 1,
Wherein the valve opening degree of the flow increasing section is 0 to 15 degrees and the valve opening degree of the flow constant section is 15 to 20 degrees.

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