KR200231069Y1 - check valve to protect against water hammer - Google Patents

Abstract

The present invention relates to a check valve for preventing water hammer. When a fluid flowing normally inside a pipeline is suddenly shut off by a pump stop or a valve closing by installing a sub check valve on a valve plate, the check valve Water-repellent check that relieves shock caused by water hammer caused by sudden shutoff of fluid by closing the valve plate after closing the valve seat to prevent damage to the pipe, valve and peripheral devices. It is about a valve.

Description

Check valve to protect against water hammer}

The present invention relates to a check valve for preventing water hammer, and in particular, a sub check valve is installed through a plurality of valve plates, so that when the fluid flowing normally inside the pipeline is suddenly blocked by a pump stop or a valve closing, the back flow of the fluid is prevented. Water pressure check to reduce the pressure of the fluid on the valve plate after the valve plate is closed to the valve seat to mitigate the impact of water hammer caused by sudden fluid shut-off to prevent damage to pipes, valves and peripherals. It is about a valve.

In general, the check valve is installed in the pipeline to prevent backflow of the fluid flowing in the pipeline and flows in only one direction. The check valve is opened by the fluid pressure, and when the flow of the fluid stops or flows back, the spring presses gravity or the valve plate. The valve is closed automatically.

That is, when the fluid flows normally inside the pipeline, the valve plate remains open due to the pressure of the fluid, but if the flow of the fluid is suddenly blocked by the valve operation or the pump operation, the valve is closed while the fluid flows back. The phenomenon occurs.

Water hammer is a water hammer in a pipe caused by a sudden change in the flow rate of the fluid that flowed through the pipe due to a sudden power failure or failure of the pump due to a power failure or breakdown, or a sudden opening or closing of the valve or mixing of other fluids. As the pressure rises or falls, the kinetic energy of the fluid is converted into pressure energy, and high pressure is generated immediately before the valve, and vibration and impact sounds are generated by the abnormal pressure. In many cases, pipes, valves, and peripherals are damaged due to rapid and repeated collisions, resulting in a shortened life.

Therefore, it is necessary to prevent the occurrence of water hammer by controlling the closing speed of the valve or installing a safety valve.

As a conventional technique for solving such water hammer, the check valve of Korean Utility Model Registration No. 20-192319, the wafer type tilting disc check valve for preventing backflow of Korean Patent Publication No. 1999-018545, and the domestic patent registration No. 20-0175254 The water hammer buffer check valve of the heading and the water hammer shock absorber of the domestic utility model registration No. 20-0165946 are known.

However, the above-mentioned techniques only have a delay of closing the plate or disk of the check valve for a predetermined time by installing a spring or the like on the check valve, and do not reduce the back pressure on the valve plate of the check valve itself. have.

That is, due to fluid backflow, the valve plate of the check valve is closed to the valve seat, and a significant back pressure is generated due to the blocking of the fluid flow flowing in one direction on the valve plate. Since a shock absorber of the type is not installed, the valve plate must withstand the back pressure of the fluid, and as such a phenomenon occurs repeatedly, it has the disadvantage of shortening the life of these parts.

The present invention is designed to solve the above problems, to prevent the water hammer caused by the fluid flow back, by installing a sub-check valve on the valve plate to offset the back pressure on the valve plate to the valve device such as valve plate It is to reduce the water hammer to prevent damage to the pipes, valves or peripherals.

1 is a cross-sectional plan view of the water hammer prevention check valve according to the present invention

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3a is a longitudinal cross-sectional view showing a sub check valve according to the present invention

Figure 3b is a longitudinal sectional view showing the operating state of the sub-check valve of Figure 3a

Figure 4 is a longitudinal sectional view showing another embodiment of the sub-check valve according to the present invention

5 is a cross-sectional view showing a state in which a groove is formed in the valve seat according to the present invention

6 is a cross-sectional view taken along line B-B of FIG. 5.

<Code Description of Main Parts of Drawing>

1: check valve 2: valve body

3: valve plate 4: sub check valve

5: valve seat 6: housing

7: Disc 8: Leaf spring

9: corrugated pipe 10: valve shaft

11: washer 12: nut

13: groove 15: shaft

16: spring 17: collision avoidance

18: flange 19: rib

20: stopping plate

In order to achieve the above object, the water hammer prevention check valve according to the present invention, in the check valve to prevent the back flow of the fluid by installing the valve body in the pipeline,

A plurality of valve plates fixedly hinged to a shaft provided on the inner circumferential surface of the valve body and pivoted; A sub check valve installed through the plurality of valve plates to offset the back pressure to the valve plate; And a valve seat integrally installed at the inner circumference of the valve body and having a groove formed along a surface in which the valve plate contacts.

The present invention is a cylindrical housing in which the sub check valve is formed in a flange on the outer periphery; A disk having a valve shaft formed at the center thereof and operated at the lower end of the housing to open and close the housing; An leaf spring inserted into the valve shaft to provide an elastic force to the disk; Corrugated pipe is inserted into the outer circumference of the leaf spring; A washer inserted into the top of the corrugated pipe to tighten the corrugated pipe; And a nut fastened to an end of the valve shaft.

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

Figure 2 shows the configuration of the water hammer prevention check valve according to a preferred embodiment of the present invention.

Referring to the drawings, the water hammer prevention check valve 1 of the present invention is composed of a valve body 2, a valve plate 3, a sub check valve 4 and the valve seat (5).

The valve body 2 is integrally installed on the fluid flow path, and a bar-shaped shaft 15 is fixedly installed across the center of the valve body, and the shaft is provided at an upper end spaced a predetermined distance from the shaft. In the same direction as the bar-shaped anti-collision bar 17 is installed fixed.

The valve plate 3 is a plate of two hemispherical metal plates, one end of each valve plate is pivotally fixed to each of the shaft 15 by a hinge, and the valve plate is wound around the outer circumference of the shaft. It is elastically supported by the spring 16 to keep the valve plate closed in the valve seat.

In addition, when the valve plate 3 is opened while being pushed backwards according to the flow of the fluid, the collision prevention bars 17 prevent the ends of both valve plates from colliding with each other.

Sub check valve (4) is installed on each of the two valve plates through each of the reverse check valve to counteract the back pressure applied to the valve plate when the valve plate is closed when the fluid flows back is a characteristic component of the present invention, The sub check valve is composed of a housing 6, a disc 7, a leaf spring 8 and a corrugated pipe 9 as shown in FIG. 3A.

The housing 6 is a cylindrical tube which is installed through the valve plate 3, and a flange 18 is formed on the upper outer circumference of the housing so that the housing can be caught and seated on the upper surface of the valve plate 3. As such, the housing may be fixed to the valve plate by mounting it on the upper surface of the valve plate, and then fixed by welding or by screwing as shown in FIG. 4.

In addition, the lower end inner circumference of the housing 6 is provided with a locking plate 20 connected to the radial rib 19 is inserted so that the valve shaft of the disk to be described later is inserted into the moving material and is not separated from the housing.

The disc 7 has a disc shape, and a rod-shaped valve shaft 10 is formed at the center thereof, and a thread is formed at the end of the valve shaft, so that the valve shaft passes through a locking plate 20 provided at the inner circumference of the housing. The end is fastened and fixed with the nut 12 so that the disk can be moved by a predetermined distance from the lower end of the housing without being separated from the housing. In addition, the tension of the leaf spring 8 can be adjusted by tightening or loosening the nut 12.

The leaf spring 8 is an alternating coupling of a plurality of bow-shaped leaf springs. The leaf spring 8 is inserted into the outer circumference of the valve shaft 10 of the disk to provide elastic force to the disk. That is, the load is directly applied to the disk by the compression action of the leaf spring according to the flow of the fluid, and as shown in FIG. 3b, the disk is pushed by hydraulic pressure when the fluid flows back, and the leaf spring is compressed while the disk is pushed and the flow path Will be opened. At this time, the coil spring is preferably a leaf spring because the tension is reduced.

Corrugated pipe (9) is a cylindrical pipe with a corrugation formed on the surface thereof is capable of contraction and extension as it is, is inserted into the outer circumference of the leaf spring to protect the leaf spring, and also flows into the sub-check valve when the fluid flow back Do not allow debris to flow between the leaf springs with the fluid.

As described above, after the leaf spring 8 and the corrugated pipe 9 are inserted and installed around the valve shaft 10, the nut 12 is fastened to the end of the valve shaft. A washer is inserted.

Such a washer 11 is shaped like a housing, and when it is inserted in close contact with the upper end of the corrugated pipe 9 between the valve shaft and the nut, the nut is prevented from loosening, thereby further tightening the tightening force between the nut and the valve shaft. The leaf springs and the corrugated pipe between them are securely fixed.

The valve seat 5 is a place where the valve plate 3 is seated. When the valve plate flows back, the valve plate 3 rotates to closely contact the valve seat 5 to block the flow of the fluid. This valve seat is formed integrally with the inner circumference of the valve body 2 and the diameter of the valve seat is approximately equal to the inner diameter of the pipe.

On the other hand, the V-shaped groove 13 is formed as a whole along the surface of the valve plate 3 in contact with the valve seat 5, which facilitates the lapping work of the valve seat in the manufacture of the check valve and the valve plate and the valve seat To keep the confidentiality between. This is illustrated in FIGS. 5 and 6.

Referring to the example of using the water hammer prevention check valve of the present invention having the configuration as described above are as follows.

The fluid flowing through the inside of the conduit continuously flows through the conduit while pushing the valve plate 3 installed in the valve body 2 in the fluid flow direction by the hydraulic pressure.

The valve plate 3 keeps the pipeline open according to the flow of the fluid, and when the flow of the fluid is suddenly blocked by the pump stop or the valve closing, the fluid flows for a while by inertia, and the water hammer phenomenon occurs while flowing backward. At this time, the valve plate 3 is returned to its original position by the pressure of the fluid flowing back and the elastic return force of the spring 16 that elastically supports the valve plate 3 so as to strongly close the valve seat 5 while closing it. Subsequently, a huge back pressure of the fluid is pushed on the valve plate.

The present invention is to penetrate the sub-check valve (4) on each of the two valve plates to mitigate the impact caused by the water hammer caused by the valve plate seated on the valve seat.

When the fluid flows normally, the sub check valve 4 is positioned inside the lower end of the housing 6 by pulling the disk 7 of the sub check valve by the extension force of the leaf spring 8, as shown in FIG. 3A. Done.

However, when the fluid flows back, the valve plate 3 closes to the valve seat and the sub check valve 4 is operated. As shown in FIG. 3B, a part of the fluid flowing back flows in the housing of the sub check valve. (6) flows into the upper end and the disk 7 is pushed as the leaf spring 8 and the corrugated pipe 9 are compressed by the hydraulic pressure, that is, the fluid passes through the interior of the housing 6 As it pushes out of the other side, the fluid pressure applied to the valve plate 3 is reduced to alleviate the water hammer.

Subsequently, the sub check valve 4 naturally closes when the fluid back pressure inside the conduit is canceled to some extent. The leaf spring 8 and the corrugated pipe 9 of the sub check valve are extended, and the disc 7 is inherently closed. Returning to the seat, the lower end of the housing 6 is completely closed. At this time, the tension of the leaf spring 8 of the sub check valve may be adjusted by setting the sub check valve and the back pressure in advance.

On the other hand, as the valve plate 3 is closed on the valve seat 5, the valve plate is closed in a state in which the valve plate 3 is in close contact with the valve seat more closely.

When the valve is opened again and the fluid flows normally, the valve plate 3 is pushed by hydraulic pressure to open the conduit.

Although the water hammer prevention check valve according to the present invention has been described with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications are made by those skilled in the art within the technical scope of the present invention. Of course this can be done.

As described above, according to the water hammering check valve of the present invention, the sub check valve is installed on the valve plate installed inside the valve body to cancel the back pressure of the fluid on the valve plate when the fluid flows back, thereby causing a sudden pump failure. By gently adjusting the impact due to the water hammer caused by fluid shut-off due to the valve closing, etc., life can be extended by preventing damage to the pipe, the valve, and the peripheral device.

In addition, by forming a groove on the upper surface of the valve seat which the valve plate is in contact with each other, when the valve plate is closed to the valve seat due to the fluid flow back, it can be more closely contact between the two sides, and also the lapping of the valve seat in the manufacture of the check valve It can also make your work easier.

In addition, by installing the leaf spring and corrugated pipe inside the housing of the sub-check valve, not only the tension is lowered, but also the foreign matter with the fluid flowing into the housing can be prevented from entering between the leaf spring.

Claims (2)

In the check valve to prevent the back flow of fluid by installing the valve body in the pipeline, A plurality of valve plates (3) pivotally fixed to the shaft (15) provided on the inner circumferential surface of the valve body (2); A sub check valve (4) installed through the plurality of valve plates to cancel the back pressure to the valve plate; And And a valve seat (5) integrally installed at the inner circumference of the valve body and having a groove (13) formed along a surface in contact with the valve plate. The method of claim 1, The sub check valve (4) is a cylindrical housing (6) formed with a flange 18 on the outer periphery; A disk (7) formed at the center of the valve shaft (10) and operated at the lower end of the housing to open and close the housing; A leaf spring 8 inserted into the valve shaft to provide an elastic force to the disk; A corrugated pipe 9 inserted into an outer circumference of the leaf spring; A washer (11) inserted into the top of the corrugated pipe to tighten the corrugated pipe; And Water hammer check valve further comprises a nut (12) fastened to the end of the valve shaft.