KR101082981B1 - Dual check valve - Google Patents

Dual check valve Download PDF

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Publication number
KR101082981B1
KR101082981B1 KR1020100123433A KR20100123433A KR101082981B1 KR 101082981 B1 KR101082981 B1 KR 101082981B1 KR 1020100123433 A KR1020100123433 A KR 1020100123433A KR 20100123433 A KR20100123433 A KR 20100123433A KR 101082981 B1 KR101082981 B1 KR 101082981B1
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KR
South Korea
Prior art keywords
valve
frame
pipe
opened
base cap
Prior art date
Application number
KR1020100123433A
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Korean (ko)
Inventor
신호용
Original Assignee
주식회사 애강그린텍
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Priority to KR1020100123433A priority Critical patent/KR101082981B1/en
Application granted granted Critical
Publication of KR101082981B1 publication Critical patent/KR101082981B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/003—Housing formed from a plurality of the same valve elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Check Valves (AREA)

Abstract

The present invention is applied to two valves, but before the front valve is fully open, the rear valve is opened to prevent the knock phenomenon in the high water pressure environment, in the low pressure environment to the backflow prevention valve that can smoothly supply water In more detail, the first frame is open at one end, the first frame having at least one opening in one region of the periphery and the other end; and one end is opened, at least one opening is formed in one region of the periphery and the other end And a second frame having the other end inserted into and fixed to one end of the first frame, and a first valve inserted into the first frame to open and close between the first frame and the second frame; and both ends of which are opened. A base cap that is inserted into and fixed to one end of the base cap; And a spring installed between the first frame and the first valve and between the second frame and the second valve so that the first valve is in close contact with the other end of the second frame and the second valve is in close contact with the base cap. , The first frame, the second frame, the first valve, the base cap, the second valve and the spring is inserted into the pipe to block the flow path of the pipe, the second valve is opened by a fluid flowing into the pipe to a predetermined degree After the guide rod of the second valve pushes the first valve, it is achieved by a double check valve, characterized in that the first valve is opened to open and close the flow path of the pipe. Accordingly, when the front valve is opened and moved at a high water pressure, the rear valve is opened while the rear valve is decreased while the valve at the front is reduced, thereby eliminating knocking occurring in the pipe and minimizing the change in water pressure. When the back pressure is generated behind the valve to facilitate the supply, the valve in the rear pushes the valve in front of the valve in front of the valve closes quickly to prevent the inflow of foreign matters, it is possible to minimize the leakage of the pipe.

Description

Dual check valve {Dual check valve}

The present invention relates to a non-return valve, and more specifically, two valves are applied, and the rear valve is opened before the valve at the front is completely opened, thereby preventing knocking and preventing a low water pressure in the forward direction. It is a double backflow prevention valve that can smoothly supply water and prevent water from being contaminated by preventing the backflow of water when a back pressure occurs, and it is easy to install and replace, and minimizes the maintenance cost by lowering the manufacturing cost. .

Typically, a backflow preventing valve is used to prevent backflow of water in a pipe for supplying drinking water or tap water.

Conventionally, a non-return valve using a single valve has been mainly used, and when a reverse flow occurs, it does not properly block it, causing a problem of raw water contamination. In order to solve this problem, a double backflow prevention valve using two valves has been developed, but the backflow is firmly shut off, but another problem such as poor water discharge or knocking occurs.

That is, in general, a backflow prevention valve using a single valve is mainly used for a pipe installed in a single house, and a backflow prevention valve using two valves is used for a pipe installed in a high-rise building such as an apartment, a villa, and a building. This is because, in the case of a single-family home, the water pressure is lower than that of a high-rise building, and when a double backflow check valve is used, water extraction failure occurs due to the problem of overcoming the elastic force of the two springs. In addition, the high pressure of the high-rise building has a problem that knocking occurs when using a double check valve.

In the conventional double check valve, water is discharged while the front valve 6 and the rear valve 6 'are opened as shown in FIG. 1. However, if the water pressure is suddenly applied to the front valve 6, the front valve 6 retreats, and the front valve 6 and the stopper 8 supporting the spring 7 of the front valve 6 collide with each other in the pipe. Knocking phenomenon such as noise and vibration occurs. In addition, the water moves very quickly to the rear of the front valve 6 in the state in which the front valve 6 is opened due to the water pressure, the instantaneous hydraulic pressure is applied to the rear valve 6 'by this fast moving water, As a result, the rear valve 6 'is retracted and collides with the stopper 8' supporting the spring of the rear valve 6 'like the front valve 6, so that knocking phenomenon such as noise and vibration occurs secondly.

In this knocking phenomenon, the probability of leakage occurs as the portion connecting the pipe and the pipe increases, and the conventional double backflow prevention valve needs to be installed by cutting off the middle of the pipe, which greatly increases the probability of leakage. Accordingly, it is necessary to seal the parts that can be leaked, so the installation takes a long time and the life is short, the installation and maintenance costs increase accordingly also occurs.

On the other hand, when a back pressure occurs, the rear valve 6 'is first closed and the front valve 6 is closed, so when foreign matter flows through the rear valve 6', foreign matter flows into the water supply (not shown) and contaminates water. Can be. That is, since water pressure is applied from the front of the front valve 6, the rear valve 6 'farthest from the raw water pipe has a low pressure, so the rear valve 6' is closed first, and the front valve 6 is Since the water pressure remains, the front valve 6 closes slowly. Accordingly, when foreign matter is introduced through the rear valve 6 ', foreign matter penetrates before the front valve 6 closes and contaminates the drinking water source.

The present invention has been made in order to solve the above problems, by applying two valves, when the valve of the front at high water pressure to move open, by opening the rear valve while reducing the valve of the forward valve movement speed Removes the knocking phenomenon inside the pipe, minimizes the change in water pressure, and smoothly supplies water.When a back pressure occurs behind the valve at the rear, the valve at the rear pushes the valve at the front, and the valve at the front closes quickly. The purpose of the present invention is to provide a double backflow prevention valve that is easy to install and has a wide range of versatility while preventing the inflow of water and minimizing leakage of the pipe.

An object of the present invention, one end is opened, at least one opening is formed in one region of the periphery and the other end; and one end is open, at least one opening is formed in one region of the periphery and the other end, A second frame having the other end fitted to one end of the first frame; and a first valve inserted into the first frame to open and close between the first frame and the second frame; and both ends of which are opened. A base cap fitted to one end and fixed; and a second valve having a guide rod formed at a portion thereof and inserted into the second frame to open and close the second frame and the base cap; And a spring installed between the first frame and the first valve and between the second frame and the second valve so that the first valve is in close contact with the other end of the second frame and the second valve is in close contact with the base cap. , The first frame, the second frame, the first valve, the base cap, the second valve and the spring is inserted into the pipe to block the flow path of the pipe, the second valve is opened by a fluid flowing into the pipe to a predetermined degree After the guide rod of the second valve pushes the first valve, it is achieved by a double check valve, characterized in that the first valve is opened to open and close the flow path of the pipe.

In addition, in order to increase the airtightness between the second frame and the first valve, and between the base cap and the second valve, the packing is installed in the first valve and the second valve, respectively; may further include.

In addition, in order to seal between the double check valve and the pipe, the sealing is installed on at least one of the periphery of the first frame, the second frame and the base cap; may further include.

In addition, the second frame is formed with a guide groove into which the guide rod of the second valve is fitted at the other end, thereby preventing the second valve from being eccentric.

In addition, the first valve has a guide rod formed at one portion, and the first frame has a guide groove into which the guide rod of the first valve is fitted at the other end thereof to prevent the first valve from being eccentric.

The present invention has the effect that the first valve absorbs the shock generated by the second valve since the guide rod of the second valve is caught by the first valve when the second valve retracts due to instantaneous water pressure. In addition, since the first valve is opened while the second valve is opened to a predetermined degree, there is an effect that the water flows in the middle without being interrupted. As a result, knocking such as vibration and noise can be prevented from occurring in the pipe, and poor water discharge can be prevented.

In addition, if a back pressure is applied from the rear of the first valve, the first valve pushes the second valve and the second valve closes quickly, so that water can be quickly prevented from flowing back to the water supply, and in particular, foreign matter enters the first valve. Even if the second valve closes quickly and blocks it, there is an effect that the foreign matter is prevented from contaminating the water back to the water supply.

In addition, since the double valve is manufactured in a single body, it can be easily inserted into the pipe, there is an advantage that can be easily installed. Accordingly, it can be installed without breaking a portion of the pipe, it is possible to minimize the area where the leak can occur, there is an advantage that the parts can be easily replaced by easy assembly and disassembly.

1 is a cross-sectional view schematically showing an operating state of a conventional double check valve.
2 is an exploded perspective view of a double backflow check valve according to an embodiment of the present invention.
3 and 4 are combined perspective views showing the top and bottom surfaces of the double check valve according to an embodiment of the present invention, respectively.
5 is a cross-sectional view of the double check valve of the present invention applied to the pipe.
6 and 7 are cross-sectional views showing the operating state of the double check valve of the present invention.

An object of the present invention, one end is opened, the first frame 10 having at least one opening formed in one region of the circumference and the other end; and one end is opened, at least one opening in one region of the circumference and the other end A second frame 30 having a second end inserted into and fixed to one end of the first frame 10; and between the first frame 10 and the second frame 30 being inserted into the first frame 10. The first valve 20 for opening and closing the; And, both ends are open, the base cap 50 is fixed to one end of the second frame 30; And, a guide rod is formed in one portion, the second frame 30 A second valve 40 inserted into an inner side of the second frame 30 to open and close the second frame 30 and the base cap 50; And between the first frame 10 and the first valve 20 such that the first valve 20 is in close contact with the other end of the second frame 30 and the second valve 40 is in close contact with the base cap 50. And a spring 60 installed between the second frame 30 and the second valve 40, respectively, including the first frame 10, the second frame 30, the first valve 20, and the base. The valve 50 is inserted into the pipe 2 while the cap 50, the second valve 40, and the spring 60 are coupled to block the flow path of the pipe 2, and the second valve is formed by the fluid flowing into the pipe 2. The guide rod 41 of the second valve 40 pushes the first valve 20 after the 40 is opened to a predetermined degree, so that the first valve 20 is opened to open and close the flow path of the pipe 2. It is achieved by the double backflow prevention valve (1).

In addition, in order to increase the airtightness between the second frame 30 and the first valve 20 and between the base cap 50 and the second valve 40, the first valve 20 and the second valve 40 are provided. Each of the packing (P) is installed; may further include.

In addition, in order to seal between the double check valve (1) and the pipe (2), the sealing is provided on at least one of the periphery of the first frame 10, the second frame 30 and the base cap 50 ( S); may further include.

In addition, the second frame 30 is formed with a guide groove 11 into which the guide rod 41 of the second valve 40 is fitted at the other end thereof, thereby preventing the second valve 40 from being eccentric.

The first valve 20 has a guide rod 21 formed at one portion thereof, and the first frame 10 has a guide groove into which the guide rod 21 of the first valve 20 is fitted at the other end thereof. 11) is formed to prevent the first valve 20 from being eccentric.

1 is a cross-sectional view schematically showing an operating state of a conventional double check valve;

2 is an exploded perspective view of a double check valve 1 according to an embodiment of the present invention,

3 and 4 are combined perspective views of the upper and lower surfaces of the double check valve 1 according to the embodiment of the present invention, respectively,

5 is a cross-sectional view in which the double check valve 1 of the present invention is applied to a pipe 2 and

6 and 7 are cross-sectional views showing the operating state of the double check valve (1) of the present invention.

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

2 to 5, the double check valve 1 according to an embodiment of the present invention, the first frame 10, the first valve 20, the packing (P), the spring (60) ), The second frame 30, the second valve 40, the base cap 50 and the sealing (S).

The first frame 10, the front of the cylindrical shape is formed in the front inner fastening groove 12, the rear of the cross-shaped frame with the circumference and the other end is bent vertically forward and connected to the front cylindrical, the rear A guide groove 11 through which the guide rod 21 of the first valve 20 is inserted is formed in the center thereof, and a portion of the guide groove 11 protrudes forward.

The first valve 20 has a cylindrical shape in which the front circumference is tapered and the rear is opened, and the guide rod 21 fitted into the guide groove 11 of the first frame 10 is directed toward the rear in the center of the rear side. A protrusion is formed and a groove into which the packing P is inserted is formed around the first valve 20. Then, the packing (P) is inserted into the inside of the first frame 10 in a coupled state. A description thereof will be described later.

The packing P is in a substantially ring shape, is inclined outwardly and extends toward the rear, and is fitted into and fixed to a groove formed around the first valve 20. A description thereof will be described later.

The spring 60 is fitted around the guide groove 11 so as to be disposed between the first frame 10 and the first valve 20. That is, in the state in which the spring 60 is inserted around the guide groove 11 of the first frame 10, the guide rod 21 of the first valve 20 is inserted on the center line of the spring 60 so that the first frame ( 10) into the guide groove (11). At this time, the elastic force of the spring 60 has a corresponding elastic force to be compressed even at low water pressure.

The second frame 30 is formed in the same structure as the first frame 10, but specifically, the front is cylindrical, the front of the fastening groove 12 is formed in the inner side, the rear of the cross-shaped frame with the other end is opened It is vertically bent forward and connected to the front cylindrical, the guide groove (11) through which the guide rod 41 of the second valve 40 is inserted in the rear center is formed through the guide groove 11 portion toward the front Protrudingly formed, in order to engage with the first frame 10 in the rear, a cylindrical coupling portion 31 is formed with a hook-shaped fastening piece 32 to fit in the fastening groove 12 of the first frame 10 It is formed integrally, a groove is formed in the outer surface of the coupling portion 31 is the sealing (S) is inserted. At this time, the inner diameter of the fastening piece 32 is formed to be extended to the rear. That is, when the packing (P) fitted to the first valve 20 is in close contact with the inner diameter of the fastening piece 32 to prevent the first valve 20 from protruding forward and coming off, when the first valve 20 is moved This is to prevent a gap between the packing P and the inner diameter of the fastening piece 32, which is eccentrically fitted to the first valve 20, to prevent leakage.

Here, the second frame 30, the coupling portion of the second frame 30 in a state in which the first valve 20 in which the spring 60 and the packing P are installed is inserted into the first frame 10. The fastening piece 32 formed in the 31 is fitted into the fastening groove 12 of the first frame 10 to be coupled. Accordingly, the spring 60 pushes the first valve 20 so that the packing P installed in the first valve 20 comes into close contact with the inner diameter of the fastening piece 32 of the second frame 30. When water pressure is generated in front of the 20, the first valve 20 is opened while moving backward by the water pressure. A description thereof will be described later.

The second valve 40 is disposed inside the second frame 30, and is the same as the installation, structure, and operation relationship of the first valve 20 described above. Specifically, the front circumference is tapered and the rear is opened. Guide rod 41 fitted into the guide groove 11 of the second frame 30 protrudes toward the rear, and a packing P is inserted around the second valve 40 at the center of the rear surface. Grooves are formed. Then, the packing P is inserted into the second frame 30 in a coupled state. However, the guide rod 41 formed on the rear side of the second valve 40, when the second valve 40 moves backward, if the guide rod 41 moves more than a set distance, the guide rod 41 is the first valve 20 By pushing the first valve 20 is formed long to open. That is, the distance D2 between the guide rod 41 of the second valve 40 and the first valve 20 is between 2/3 to 1/2 of the total stroke distance D1 of the second valve 40. To have a distance of, the length of the guide rod 41 of the second valve 40 is formed. A description thereof will be described later.

Base cap 50 is substantially cylindrical, the outer surface is formed with a groove into which the sealing (S) is inserted, the rear end is formed with a fastening piece 32 to be inserted into the fastening groove 12 of the second frame (30). . The base cap 50 includes a fastening piece 32 of the base cap 50 in a state in which the second valve 40 having the spring 60 and the packing P is inserted into the second frame 30. ) Is fitted into the coupling groove 12 of the second frame (30). As a result, the spring 60 pushes the second valve 40 so that the packing P installed in the second valve 40 comes into close contact with the inner diameter of the fastening piece 32 of the base cap 50. When water pressure is generated in front of 40, the first valve 20 is opened while moving backward by the water pressure. A description thereof will be described later.

Here, the fastening piece 32 of the base cap 50 corresponds to the fastening piece 32 formed in the second frame 30 as described above, and thus, a detailed description thereof will be omitted, and a spring installed in the second valve 40 ( 60 corresponds to the spring 60 installed in the first valve 20, so detailed description thereof will be omitted.

The sealing S is fitted into grooves formed on the outer surface of the coupling portion 31 of the second frame 30 and grooves formed on the outer surface of the base cap 50, respectively. A description thereof will be described later. The coupling structure of the base cap 50, the second frame 30 and the first frame 10 is specifically the second frame 30 is coupled to the rear of the base cap 50 and the second The first frame 10 is coupled to the rear of the frame 30 so that the base cap 50, the second frame 30, and the first frame 10 are integrally coupled to the pipe 2. It is inserted into the flow path inside of.

Hereinafter, the installation and operation of the double check valve 1 according to the embodiment of the present invention with reference to FIGS. 5 to 7 will be described in detail.

The present invention is installed at one end of the pipe (2) of the leak check site, or the water pipe (2) into which tap water or drinking water flows, for example, as shown in FIG. After the expansion, the present invention is inserted into the inside of the pipe 2, and then the snap ring 3 is installed to prevent the present invention from escaping from the pipe 2. At this time, between the pipe 2 and the present invention and the pipe 2 by the sealing (S) provided in the present invention is tightly sealed.

If the gap between the present invention and the pipe 2 is not tightly sealed, water may leak out little by little into the gap between the present invention and the pipe 2 and leaks may occur.

On the other hand, the double check valve (1) of the present invention does not expand the inner diameter of the pipe when the inner diameter of the pipe is larger than the outer diameter of the present invention, the inner ring of the pipe, that is, the portion of the front end of the present invention is a snap ring ( (Not shown), the present invention may be inserted into the pipe, and another snap ring 3 may be installed at the rear end of the present invention to fix the present invention to the pipe.

When water pressure is generated in front of the pipe 2, the base cap 50 opens while the second valve 40 blocking the rear of the base cap 50 moves backward. That is, the second valve 40 retreats quickly because the water pressure on the supply side is initially high. After the second valve 40 moves by 2/3 to 1/2 of the stroke distance, the second valve 40 is moved. The guide rod 41 of the push the first valve 20, the first valve 20 is opened. That is, although the spring 60 installed in the second valve 40 initially reduces the moving speed of the second valve 40, it is insufficient to reduce the moving speed of the second valve 40 due to the high initial water pressure. However, in the process of the guide rod 41 of the second valve 40 pushes the first valve 20, the spring 60 installed at the rear of the first valve 20 is rearward of the second valve 40. By absorbing the speed moving to reduce the speed once more, the second valve 40 and the second frame 30 to prevent the collision. Accordingly, by preventing the second valve 40 and the second frame 30 from colliding, it is possible to prevent the occurrence of knocking in the pipe 2.

Then, the water collides with the second valve 40 and the speed decreases primarily, and the water moves through the base cap 50 to the inside of the second frame 30, and then the first frame 10 again. Since it is discharged through the interior of the water velocity is discharged sequentially decreases. This is because water passes through the inside of the second frame 30 past the opening formed around the second frame 30 and then exits through the rear opening of the second frame 30, and again the first valve 20 Opens, passes through the opening formed around the first frame 10, passes through the interior of the first frame 10, and then exits through the rear opening of the first frame 10, i.e., moves from outside to inside, back to outside By forming the flow path through which the water passes so as to be able to sequentially reduce the speed of the fast water. In addition, since the first valve 20 is opened in advance by the second valve 40, water flows smoothly without water pressure accumulating in front of the first valve 20. Accordingly, it is possible to prevent the sudden pressure of the first valve from being applied, and to reduce the speed of the water sequentially to prevent the water from being suddenly ejected.

For example, as shown in FIG. 1, since the conventional double backflow check valve has a structure in which two valves are separated from each other independently, the front valve in a state where water pressure is accumulated in the front valve 6 in the initial hydraulic pressure state. (6) moves rapidly and is fully opened, and water pushes the rear valve 6 'sharply in a state where the speed of water does not decrease. That is, knocking occurs when the front valve 6 collides with the stopper 8, and knocking occurs further because the rear valve 6 'also collides with the stopper 8'. This is because it is difficult to reduce the speed of water in the initial hydraulic pressure state only by the elastic force of the spring (7) installed in the front valve (6), the water through the front valve (6) is not opened because the front valve (6) is completely open. This is because the rear valve 6 'is suddenly pushed out. Then, a predetermined hydraulic pressure is accumulated in the process of pushing the front valve 6 to the water, and a predetermined hydraulic pressure is further accumulated in the process of pushing the rear valve 6 'back to the water. Therefore, in the piping, knocking occurs additionally, and water pressure is further accumulated to open the rear valve 6 ', which causes water to be spontaneously ejected and splashes in all directions. This phenomenon is that the front valve (6) and the rear valve (7) operate independently, the distance between the valve and the valve, the lower the elastic force of the spring 7 is more prominent knocking phenomenon occurs. For example, the lower the elastic force of the spring (7), the smoother the water can be supplied even in a low water pressure environment, if using a spring (7) having a high elastic force water at a low water pressure to the front valve (6) and the rear Since the front valve 6 and the rear valve 6 'are not opened properly because the valve 6' cannot be pushed out, there is a problem in that water discharge is caused.

On the other hand, if a back pressure occurs at the rear of the rear valve 6 ', the front of the front valve 6 has a large water pressure, so the rear valve 6' is closed and the front valve 6 is closed. For example, when foreign matter is introduced through the rear valve 6 ', the foreign matter penetrates toward the water supply (not shown) before the front valve 6 closes, causing water contamination.

However, in the present invention, the elastic force of the spring 60 applied to the first valve 20 and the second valve 40 is low, the interval between the first valve 20 and the second valve 40 is short, Even in the hydraulic pressure state, the second valve 40 is caught by the first valve 20, and the two springs 60 reduce the moving speed of the second valve 40, whereby the second valve 40 and the second frame ( It is possible to prevent the collision 30 to prevent the knocking phenomenon, by opening the first valve 20 located in the rear in advance to prevent the hydraulic pressure is suddenly caught on the first valve 20 and to bend the flow path It is possible to prevent the phenomenon that water is suddenly ejected in a moment. In addition, in the present invention, the first valve 20 and the second valve 40 are easily opened by using the spring 60 having a low elastic force, and thus, smooth water can be supplied even in a low water pressure environment.

In particular, when a back pressure occurs behind the first valve 20, the first valve 20 pushes the second valve 40 in the process of closing the first valve 20, so that the second valve 40 is closed. Closes quickly. For example, since the second valve 40 closes quickly even if foreign matter is introduced through the first valve 20, the second valve 40 blocks the foreign material introduced through the first valve 20 to supply the water supply. It is possible to prevent foreign matter from penetrating into (not shown).

On the other hand, the conventional double check valve is manufactured by installing two valves in a separate connection pipe, when the check valve is broken, it is very cumbersome because the check valve must be replaced as a whole, so the replacement time It takes a long time and the manufacturing cost is high, so the maintenance cost is high. In addition, the separation of the middle of the pipe is installed, there is a problem that increases the portion that can be leaked as the portion to connect more.

However, since the double check valve 1 of the present invention is manufactured by combining the two valves in a single body, a separate connecting pipe (not shown) is not required, and the snap ring 3 is inserted into the general pipe 2. You only need to form a losing groove. Accordingly, the versatility is wide, and the present invention can be easily attached to the pipe 2. In addition, even if the present invention fails, the present invention can be removed quickly after removing the present invention after removing the snap ring 3 installed in the pipe 2, so that the replacement can be made very quickly and easily, and the maintenance cost can be lowered by lowering the manufacturing cost. In particular, since it is not necessary to cut off the middle of the pipe (2), it is possible to minimize the portion that can be leaked by minimizing the connecting portion.

In describing the present invention described above, even if the embodiment is different, the same reference numerals are used for the same configuration, and the description may be omitted as necessary.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Shall not be construed as being understood. Therefore, a person having ordinary knowledge in the technical field to which the present invention pertains may easily implement other forms of the present invention within the same scope as the above-described embodiments, or the present invention only by the description of the embodiments of the present invention. It will be possible to practice the invention in the same and equal range.

One; Double check valve
2; pipe
3; Snap ring
10; 1st frame
11; Home
12; Fastening groove
20; 1st valve
21, 41; Guide rod
30; Frame 2
31; Engaging portion
32; Fastener
40; 2nd valve
50; Base cap
60; spring
P; packing
S; Sealing

Claims (3)

One end of the front is cylindrical, the rear is provided with a cross-shaped frame connected to the front and at least one opening is formed in one region of the circumference and the other end and a guide groove formed in the center of the cross-shaped frame is formed A first frame;
One end of the front is a cylindrical opening, the rear is provided with a cross-shaped frame connected to the front and at least one opening is formed in one region of the circumference and the other end, the guide groove penetrated in the center of the cross-shaped frame A second frame formed with the other end of the rear end inserted into and fixed to the one end of the front side of the first frame;
A guide rod is formed at one side, and the guide rod is installed inside the first frame to be fitted into the guide groove of the cross-shaped frame of the first frame to open and close between the first frame and the second frame. valve;
A base cap having both ends open and fitted to one end of the front of the second frame;
A second valve is formed on one side and the inside of the second frame so that the guide rod is fitted into the guide groove of the cross-shaped frame of the second frame to open and close between the second frame and the base cap ; And
The first frame and the first frame to block the opening of the other end of the second frame, and the second valve to block the opening of the base cap formed at a position facing the second frame. Springs are provided between the valve and between the second frame and the second valve, respectively;
The second frame is coupled to the rear of the base cap and the first frame is coupled to the rear of the second frame, so that the base cap, the second frame and the first frame are integrally coupled to the inside of the pipe After the second valve is opened by the pressure of the fluid introduced into the flow path of the pipe to a predetermined degree, the guide rod of the second valve pushes the first valve to open the second valve, and then the first valve is opened. Double check valve, characterized in that for opening the valve flow path of the pipe.
The method of claim 1,
Double check valve, characterized in that the sealing is fitted to the outer surface of the second frame and the outer surface of the base cap. delete
KR1020100123433A 2010-12-06 2010-12-06 Dual check valve KR101082981B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108708996A (en) * 2018-07-02 2018-10-26 上海银轮热交换系统有限公司 Concealed check valve
KR20190073683A (en) * 2017-12-19 2019-06-27 김정범 Dual Check Valve For Preventing Backflow
KR102088192B1 (en) * 2019-08-23 2020-04-24 주식회사 엔게인 The backward preventing apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200379351Y1 (en) 2004-11-25 2005-03-17 김경수 high pressure hose with flowing backward preventive

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200379351Y1 (en) 2004-11-25 2005-03-17 김경수 high pressure hose with flowing backward preventive

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190073683A (en) * 2017-12-19 2019-06-27 김정범 Dual Check Valve For Preventing Backflow
KR102021673B1 (en) * 2017-12-19 2019-09-16 김정범 Dual Check Valve For Preventing Backflow
CN108708996A (en) * 2018-07-02 2018-10-26 上海银轮热交换系统有限公司 Concealed check valve
KR102088192B1 (en) * 2019-08-23 2020-04-24 주식회사 엔게인 The backward preventing apparatus
US11007314B2 (en) 2019-08-23 2021-05-18 Engain Apparatus for preventing backflow

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