KR100727833B1 - A Linear Control Check Valve for Water Hammer Arresting - Google Patents

Abstract

The present invention relates to a check valve that prevents a backflow of fluid, by using the pressure of the compressed air as a driving force for closing the check valve, by controlling the valve closing time linearly so that the water hammer does not occur, and caused by other causes The water hammer phenomenon relates to a check valve device absorbed by a water hammer and a linear control method of the check valve device.

In order to solve the problem of the conventional check valve, the present invention adopts a check valve driven by compressed air. An external compressed air cylinder may be used as a source of compressed air, or may be used in combination with a water hammer which has a built-in compressed air.

The water hammer check valve, which is a basic component of the present invention, includes a valve body, a trim flange fixed to a downstream flange of the valve body, a pressure chamber placed at a central portion of the valve body, a support connecting the trim and the pressure chamber, and the pressure chamber inside. The actuator is mounted to, the plug is inserted into the opening of the pressure chamber to slide back and forth, and a compressed air pipe connected to the air inlet of the pressure chamber and the valve body.

Check valve, water hammer, water hammer, linear control, time delay, compressed air

Description

A Linear Control Check Valve for Water Hammer Arresting}

1 is a conventional water hammer.

Figure 2 is the inventors of the self-linear control time delay type anti-water hammer check valve.

3 is a detailed view of the air inlet plug.

Figure 4 is a detailed view of the air inlet plug capable of replacing the orifice.

5 is a water hammer prevention check valve having a piston type water hammer.

6 is a water hammer prevention check valve having a bellows type water hammer.

Figure 7 is an air supply pipe is a water hammer check valve formed in the trim flange and the support.

8 is an anti-water hammer check valve through which the air supply pipe passes through the inner pipe.

9 is a check valve for preventing water hammer receiving compressed air from an adjacent water hammer.

The present invention relates to a check valve (Check Valve) to prevent the back flow of the fluid. More specifically, the pressure of the compressed air is used as a driving force for closing the check valve, and the valve closing time is linearly controlled so that the water hammer does not occur, and the water hammer caused by other causes is absorbed by the water hammer. And a linear control method of the check valve device.

Water Hammer is a phenomenon in which a shock wave is generated in a fluid when a flow path is suddenly closed or suddenly opened in a flow path where an incompressible fluid such as water and oil flows. If it is severe, the pipe is broken, and as if hammered, it causes vibration, noise and vibration in the pipeline, damages the vulnerable parts such as valves, gauges, and joints, and causes leakage. The intensity of this water hammer is greater as the closing time of the flow path is shorter.

Water hammer occurs when a pipeline is suddenly closed or suddenly opened as described above, and a check valve installed in a relation to prevent a back flow of a fluid is a representative closing device of a typical flow path. If the fluid flows back due to an interruption of the fluid transfer pump or damage to the pipe, the check valve closes momentarily, and water hammer occurs.

With the check valve installed, in order to prevent the above water hammer phenomenon or to weaken the strength even if it occurs, the closing speed of the valve may be slowed or a separate water hammer preventer may be attached.

The general check valve has a gravity type and a spring type according to the driving method. As a check valve for preventing water hammer, a method of delaying the closing time of the valve is mainly used. Specifically, check using a sub check valve as shown in Korean Utility Model Registration No. 20-0231069, using a delay cylinder as shown in Domestic Utility Model Registration No. 20-0175254, and checking in Korea Utility Model Registration No. 20-0329457. There is a method of opening and closing the valve at an appropriate speed by electrically driving the valve from the outside.

However, although the previous two methods of the conventional techniques have the effect of reducing the water hammer phenomenon by delaying the closing speed of the valve, it is impossible to control the closing time of the valve at an appropriate speed, and also in the final closing time The mode has a mode of preventing water hammer or a large loss of fluid when the closing time is long. In the last method, the device is complicated and expensive, there is a high risk of failure, and an external power source is required, which is inconvenient to use.

To prevent the occurrence of water hammer, separate water hammer arresters may be installed in the pipeline. A water hammer is generally used has a cavity (cavity) injecting compressed air into a portion of the pipe as shown in FIG.

If a water hammer occurs and a large fluid pressure is generated inside the pipeline, this pressure propagates along the pipeline (a) and is transmitted to the bellows (b), which causes the bellows to swell and the air in the pupil (c) to be compressed. The pressure is absorbed and disappears.

Such a water hammer does not fundamentally prevent the occurrence of water hammer, but only alleviates the degree of water hammer and does not completely eliminate it.

The present invention, in order to solve the problems occurring in the conventional water hammer check valve, the water closing phenomenon does not occur due to the rapid closing does not occur, the structure is simple, retains the valve opening and closing force in itself, the delay of valve closing An object of the present invention is to provide a check valve capable of controlling the time arbitrarily and linearly and a method of linearly controlling the opening and closing time of the check valve.

In order to achieve the technical problem as described above, the check valve of the present invention employs an actuator driven by compressed air. When the check valve is connected to an external compressed air cylinder, a compressor, or the like, the object of the present invention can be achieved. However, even after the check valve is installed, a conventional water hammer preventer may be used in order to completely eliminate water hammer that may remain weak and water hammer caused by other causes, and to simply supply compressed air to the check valve.

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

As shown in FIG. 2, the water hammer check valve 100, which is a basic component of the present invention, includes a valve body 110 and a trim fixed to a downstream flange of the valve body and mounted inside the valve body 110. The trim may include a trim flange 120, a pressure chamber 130 positioned at a central portion of the valve body, three to four supports 140 connecting the trim flange 120 and the pressure chamber 130, and the pressure chamber. It is composed of an actuator 150 mounted therein, a plug 160 inserted into the opening of the pressure chamber and sliding back and forth, and a compressed air tube 170 connected to the air inlet of the pressure chamber and the valve body.

The valve body 110 of the check valve has a shape in which flanges 112 and 113 are formed at both ends of the casing 111, and a valve seat 114 is formed inside the upstream side of the casing 111. The longitudinal section has a curve close to the parabola, and there is an air inlet 115 on the outer wall of the casing 111. The upstream flange 112 of the valve body is connected to the pipeline through which fluid is introduced, and the flange flange 120 is connected to the downstream flange 113. A gasket 121 is used to prevent the leakage of fluid in the connection portion of the trim flange 120 and the downstream flange 113 of the valve body, and the flange flange 120 is coupled to the downstream flange 113 of the valve body. The screw hole 122 is processed so that it may be carried out.

The trim flange 120 has a thick flange shape, and the pressure chamber 130 is fixed to the trim flange 120 by three to four support members 140 having a streamlined shape and a plate shape. The support 140 is welded or bolted to the trim flange 120 and the pressure chamber 130.

The pressure chamber 130 is placed at the central portion of the valve body. The pressure chamber has an opening at one end and a hollow cone shape, and an air pocket 131 is formed at the end of the cone. And the outer wall of the air pocket 131, there is an air connector 132, the air pipe 170 is connected to the compressed air is supplied from the compressed air outside.

An actuator 150 is mounted inside the pressure chamber 130. The actuator is made of rubber, and the bellows 151 freely stretchable in the longitudinal direction, the air inlet plug 152 assembled at one end of the bellows, the bellows of the bellows. It is composed of a pressure pin 153 assembled to the other end. The head of the pressure pin 153 and the head of the air inlet plug 152 are deep and have a groove with a locking jaw, and the end of the bellows 151 is firmly fitted into the groove to prevent air from leaking. give.

As shown in FIG. 3, the air inlet plug 152 is inserted into and coupled to the air pocket 131 of the pressure chamber. In order to prevent leakage of air, one to three O-rings 1522 are provided on the outside thereof. Is fitted.

The air inlet plug 152 of the actuator 150 may be simply inserted into the air pocket 131 of the pressure chamber 130, but as shown in FIG. 3, the neck of the air inlet plug 152 ( 1523) and threaded into the inlet of the air pocket 131 of the pressure chamber is screwed to the actuator 150 is assembled stably.

 The plug 160 is a portion that eventually opens and closes the valve. The plug 160 is inserted into the front end opening of the pressure chamber 130 and slides back and forth, and has a protrusion 162 at the inner center thereof, and the protrusion 162 has a hole. The pressure pin 153 of the actuator 150 is coupled thereto. The coupling of the plug 160 and the actuator 150 may be inserted simply, but for safe coupling, a screw is machined into the outer surface of the pressure pin 153 of the actuator 150 and the hole of the protrusion 162 of the plug. It is better to screw.

The head 161 of the plug 160 has a parabolic curve whose longitudinal section is gentle, and when the valve is closed, the head 161 contacts the seat 114 of the valve body 110 to block the flow path.

The compressed air pipe 170 is connected between the air connector 132 in the air pocket 131 of the pressure chamber 130 and the air inlet 115 of the valve body 110, and the air inlet 115 of the valve body is connected. The compressed air of a suitable pressure is supplied from an external compressed air cylinder (not shown).

The air inlet 115 of the valve body 110 is connected to an air supply pipe 910 and a water hammer preventer 900 installed in a pipe line adjacent to the check valve as shown in FIG. 9, instead of an external compressed air cylinder. It can also be supplied with compressed air.

The function of this water hammer check valve is as follows.

When the fluid flows normally in the pipeline where the check valve 100 is installed, the pressure (static pressure + dynamic pressure) of the fluid supplied from the pump or the like overcomes the air pressure of the actuator 150 and pushes the plug 160 downstream to open the valve. , Fluid flows. If the pressure on the upstream side of the valve drops due to the breakage of the pipe or the operation of the pump, the air pressure in the actuator 150 pushes the pressure pin 153 upstream, and the pressure pin is chained. Thus, the plug 160 is pushed upstream to close the flow path.

At this time, in order for the actuator 150 to operate, compressed air must be continuously introduced into the air inlet plug 152. When the diameter of the orifice 1524 of the air inlet plug 152 of the actuator 150 is reduced, the compressed air is reduced to the actuator ( 150) Since it takes time to supply the inside, the degree of decrease in flow rate while the valve is closed is reduced in proportion to the closing time of the valve, and eventually the valve 100 is completely closed.

In this way, the flow rate reduction while the valve is closed is directly proportional to the closing time of the valve is called "linear control of the flow rate." The water hammer prevention check valve of the present invention adopts an actuator 150 using compressed air. Linear control of the flow rate is realized by a simple method.

  The screw hole 1527 is machined in the portion where the orifice 1524 of the air inlet plug 152 of the actuator 150 is shown in Fig. 4, and the orifice having a small diameter orifice 1526 is shown here. The plug 1525 can be used in combination. In this case, by selecting the orifice plug 1525 having an appropriate size and length of the orifice 1526, the opening and closing speed of the check valve 100 can be arbitrarily adjusted. A gasket 1528 is used between the head of the orifice plug 1525 and the head 1521 of the air inlet plug to maintain airtightness.

To close the valve quickly to reduce fluid loss, the orifice plug 1525 with a large and short orifice 1526 can be used to allow compressed air to fill the bellows 151 of the actuator 150 quickly. To reduce the risk of water hammer by closing the valve very slowly, even if there is some loss, the orifice plug 1525 with a small diameter and long orifice 1526 can be used to delay the time the compressed air is charged into the actuator bellows. .

The check valve 100 of the present invention can easily adjust the opening and closing time of the valve by selecting and replacing the orifice plug 1525 as appropriate.

In general, the check valve has a large pressure loss due to a complicated flow of fluid inside the valve, and large bubbles are generated due to large cavitation, which causes pipe noise and vibration, and the fluid in the pipe is smooth. This can cause it to not flow. However, the check valve 100 of the present invention forms a venturi (Venturi) flow path between the inner surface of the casing 111 of the valve and the pressure chamber 130 is smooth, so that the fluid passes the check valve 100 There is little loss and little cavitation.

The above description relates to a water hammer prevention check valve that operates by receiving compressed air from a separate external compressed air cylinder. In addition, the water hammer which holds compressed air in itself can be combined with this check valve, and can be used. The configuration of the check valve with this type of water hammer is as follows.

The water hammer prevention check valve 100 may be coupled to the piston type water hammer 200 having the following configuration.

The piston type water hammer (200) has an inner pipe (210) having an upstream end coupled to a flow path of the trim flange (120) of the check valve (100) and a pressure transfer hole (212) at the end of the downstream end. ; It is installed concentrically with the inner pipe 210, there is an air outlet plug 221 and the air filling plug 222 on its side, one end of which is coupled to the outside of the trim flange 120 of the water hammer check valve Cylindrical air chamber 220; It is installed between the inner pipe 210 and the air chamber 220, the sliding movement along the outer wall surface of the inner pipe 210 and the inner wall of the air chamber 220, the inner pipe 210 to pass through the center thereof. A piston 230 having a hole therein; And, the screw is coupled to the downstream end of the inner pipe 210 and the downstream end of the air chamber 220, the center has a hole for forming a flow path, the outer edge of the screw can couple the flange of the connection pipe It consists of a stopper 240 with holes.
Compressed air is filled in the space between the outer wall of the inner pipe 210 and the inner wall of the air chamber 220 through the air filling plug 222.

If water hammer occurs for some reason, a large pressure is suddenly applied to the fluid flowing into the internal pipe of the water hammer 100, and this pressure is transmitted through a pressure transfer hole 212 drilled at the downstream end of the internal pipe 210. It is delivered to the piston 230. When the piston 230 is subjected to the pressure of a large fluid, the piston is pushed upstream of the compressed air is filled, the pressure of the fluid is lost and eventually the water hammer disappears. This is the typical function of a water hammer.

The air inlet 115 of the valve body 110 of the water hammer check valve and the air outlet plug 221 of the air chamber 220 of the piston type water hammer 200 are connected to the air supply pipe 250. That is, the compressed air inside the air chamber 220 of the water hammer is used as an open / close power source of the check valve 100.

By installing two or three safety pins 231 on the upstream side of the piston 230, it is preferable to prevent the piston from being pushed to an air inlet or the like.

A pressure gauge 223 may be installed on the outer wall of the air chamber 220 to check the air pressure inside the air chamber 220.

When the piston type water hammer preventer 200 is coupled to the check valve 100 as described above, a separate external reservoir is not required, and the water hammer can be absorbed up to the water hammer phenomenon caused by the cause other than the operation of the check valve.

In the check valve 100 provided with a water hammer, the water hammer can be combined with the bellows type water hammer 300 of the following type in addition to the piston water hammer 200 as described above.

One end of the bellows type water hammer (300) is coupled to the central flow path of the trim flange (120) of the check valve (100), and the other end is coupled to the stopper (340) on the downstream side, and the air groove (311) at both ends. As formed, the bellows 310 made of rubber; An inner pipe 320 having the same length as the bellows 310 and having an outer diameter equal to the inner diameter of the bellows, installed inside the bellows, and having a plurality of pressure transfer holes 321 formed on the entire wall; It is installed concentrically with the inner pipe 320, the air outlet plug 331 and the air filling plug 332 on its side, one end of the cylindrical air chamber coupled to the outside of the trim flange 120 of the check valve 330; And, it is coupled to the downstream end of the bellows 310 and the downstream end of the air chamber 330, the center has a hole for forming a flow path, the outer edge has a screw hole for engaging the flange of the connection pipe It consists of a stopper 340.
Compressed air is filled in the space between the outer wall of the inner pipe 320 and the inner wall of the air chamber 330 through the air filling plug 332.

The air inlet 115 of the valve body 110 of the water hammer check valve and the air outlet plug 331 of the air chamber 330 of the bellows type water hammer 300 are connected to the air supply pipe 350.

If water hammer occurs for some reason, a large pressure is suddenly applied to the fluid 211 flowing into the inner pipe 320 of the bellows type water hammer 300, which is a pressure on the wall of the inner pipe 320. The bellows 310 is delivered to the bellows 310 through the delivery hole 321, and the bellows 310 is pressurized into the air chamber 330 in which the compressed air is filled. As a result, the pressure of the fluid is lost and eventually the water hammer disappears.

The water hammer prevention check valve including the above-described piston type water hammer (200) or bellows type water hammer (300) exposes the air chambers (220, 330) of the water hammer and the air inlet (115) of the body of the check valve to the outside. Instead of using the supplied air supply pipes 250 and 350, as shown in FIG. 7, holes are formed in the trim flange 120 and the support 140 to form a compressed air passage 700, and the compressed air passage The furnace may be directly connected to the coupling hole of the air connector 132 of the pressure chamber. In this case, the air inlet 115 and the compressed air pipe 170 and the air connector 132 in the casing 111 of the valve body is unnecessary and not used.

In addition, instead of using air supply pipes 250 and 350 exposed outside of the air chamber of the water hammer and the check valve body, as shown in FIG. 8, the inner tube 210 of the piston type water hammer, or An air outlet plug 810 is installed in the bellows 320 of the bellows type water hammer and the air supply pipe 820 is connected to the pressure chamber 130 of the check valve through the inside of the inner pipes 210 and 310 of the water hammer. It may be connected to the air connector 132.
In this case, the air inlet 115 and the compressed air engine 170 in the casing 111 of the valve body are unnecessary and are not used.
As shown in FIG. 9, an air leakage plug 901 is installed in a body of the water hammer preventer 900 installed in an adjacent pipe line, and the air flow plug 901 and the check valve 100 are shown in FIG. 9. By connecting the air inlet 115 of the) to the air supply pipe 910, the compressed air required for the operation of the check valve may be supplied from the water hammer (900).

The inventors of the present invention have the following effects compared to other types of check valves.

First, the present invention uses compressed air as the check valve opening and closing means, and delays the time that the compressed air is supplied to the actuator to control the opening and closing of the check valve linearly, so that the water hammer during the check valve operation You can prevent it from happening.

Second, the present invention can be very simple structure by adding a very simple compressed air cylinder or attaching a water hammer with a built-in compressed air to the check valve, the price is low, there is no worry of failure, easy to install, Easy maintenance

Third, the present invention can arbitrarily adjust the valve opening and closing time by replacing the orifice plug of the actuator for driving the check valve.

Fourth, as an embodiment of the present invention, the check valve combined with the water hammer prevents water hammer caused by other causes.

Claims (10)

A valve body 110 having a flange at both ends, an upstream side of the valve seat, a longitudinal cross-section of the inner surface of the valve surface, and an air inlet on the outer wall; A trim flange 120 fixed to a downstream end of the valve body; A pressure chamber 130 having one end opening and a hollow cone shape, an air pocket formed at an end of the cone, an air connector at an outer wall of the air pocket, and positioned at a central portion of the valve body; Connecting the trim flange and the pressure chamber, the cross section having a streamlined shape and having a whole plate shape, several supports 140; An actuator 150 mounted inside the pressure chamber and configured of a bellows made of rubber, an air inflow plug assembled at one end of the bellows, and a pressure pin assembled at the other end of the bellows; A plug 160 inserted into an opening of the pressure chamber and sliding back and forth, having a protrusion at an inner center thereof, to which the pressure pin of the actuator is coupled; And, one end is connected to the air air connector of the pressure chamber, the other end includes a compressed air pipe 170 is connected to the air inlet of the valve body, Water hammer check valve. In the water hammer prevention check valve of claim 1, The air inlet plug of the actuator 150 is an air inlet plug having a screw hole capable of engaging an orifice plug, and further comprising an orifice plug 1525 coupled to the screw hole. Water hammer check valve. In the water hammer prevention check valve of claim 1 or 2, An inner pipe 210 having one end coupled to a central flow path of a trim flange of the water hammer check valve and having a pressure transfer hole at the other end thereof; A cylindrical air chamber 220 installed concentrically with the inner pipe and having an air outlet plug 221 and an air filling plug 222 on one side thereof, one end of which is coupled to the outside of the trim flange of the water hammer check valve. ); A piston 230 disposed between the inner pipe and the air chamber and sliding along an outer wall surface of the inner pipe 210 and having a hole through which the inner pipe passes; A stopper 240 coupled to a downstream end of the inner pipe and a downstream end of the air chamber, having a hole forming a flow path at the center thereof, and a screw hole for engaging a flange of a connecting pipe at an outer edge thereof. ); And, characterized in that it further comprises an air supply pipe 250 for connecting the air inlet of the valve body of the water hammer check valve and the air outlet plug of the air chamber, Water hammer check valve. In the water hammer check valve of claim 3, instead of the air supply pipe (250), A hole is formed in the trim flange 120 and the support 140 to form a compressed air passage 700, which is a hole into which the air connector 132 of the pressure chamber 130 of the check valve is coupled. Connected directly to; The check valve 100 is a check valve without the air connector 132, the compressed air pipe 170, and the air inlet 115; And, the air chamber 220 is characterized in that the air chamber without the air outlet plug 221, Water hammer check valve. In the water hammer prevention check valve of claim 3, instead of the air supply pipe 250 and the air outlet plug 221 of the air chamber, The air outlet plug 810 is installed in the inner pipe 210, and the air supply pipe 820 passes through the inner pipe 210 to the air outlet plug 810 of the inner pipe and the air connector of the pressure chamber 130. 132; The check valve 100 is characterized in that the check valve without the compressed air pipe 170 and the air inlet 115, Water hammer check valve. In the water hammer prevention check valve of claim 1 or 2, A bellows 310 having one end coupled to a central flow path of a trim flange of the water hammer check valve and having air grooves formed at both ends thereof; An inner pipe 320 having the same length as the air bellows, the outer diameter of which is the same as the inner diameter of the air bellows, which is installed inside the bellows, and has a plurality of pressure transfer holes formed on a wall thereof; It is installed concentrically with the inner pipe, the air outlet plug 331 and the air filling plug 332 on the side, one end of the cylindrical air coupled to the outside of the trim flange 120 of the water hammer check valve Chamber 330; A stopper 340 coupled to a downstream end of the bellows and a downstream end of the air chamber, having a hole forming a flow path at a center thereof, and a screw hole capable of engaging a flange of a connection pipe at an outer edge thereof; And, characterized in that it further comprises an air supply pipe 350 for connecting the air inlet of the valve body of the water hammer check valve and the air outlet plug of the air chamber, Water hammer check valve In the water hammer prevention check valve of claim 6, instead of the air supply pipe (350), A hole is formed in the trim flange 120 and the support 140 to form a compressed air passage 700, which is a hole into which the air connector 132 of the pressure chamber 130 of the check valve is coupled. Connected directly to; The check valve 100 is a check valve without the air connector 132, the compressed air pipe 170, and the air inlet 115; And, the air chamber 330 is characterized in that the air chamber without the air outlet plug 331, Water hammer check valve. In the water hammer prevention check valve of claim 6, Instead of the air supply pipe 350 and the air outlet plug 331 of the air chamber, An air outlet plug 810 is installed in the inner pipe 320, and an air outlet of the air outlet plug 810 and the pressure chamber 130 of the inner pipe is formed through the air supply pipe 820 in the inner pipe 320. 132; The check valve 100 is characterized in that the check valve without the compressed air pipe 170 and the air inlet 115, Water hammer check valve. The water hammer prevention check valve of claim 1 or 2 has a check that connects an air outlet 901 of the water hammer preventer 900 provided at an adjacent piping line to the air inlet 115 through an air supply pipe 910. It is a valve, Water hammer check valve. delete

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