KR102190800B1 - Multi-stage pressure reducing valve for high differential pressure - Google Patents

Abstract

The present invention relates to a multi-stage pressure reducing valve, comprising: a second pressure reducing unit comprising a spring type pressure reducing valve including a diaphragm so as to be connected to a building water supply line to reduce the water pressure; Provides a multi-stage pressure reducing valve for high differential pressure, characterized in that it comprises a first pressure reducing unit that is connected in series to at least one inlet side of the second pressure reducing unit to reduce the water supply pressure before passing through the second pressure reducing unit, and the above configuration A water supply system using a multi-stage pressure reducing valve for high differential pressure of, comprising: a single storage tank provided in a building to store water supplied through a water supply pipe; A single water supply line connected to the storage tank and connected to the top floor; A single high-pressure pump provided in the water supply line at the outlet side of the water storage tank and supplying water at high pressure along the water supply line; Each individual line provided on each floor of the building and connected to the water supply line; High differential pressure multi-stage pressure reducing valve to the high pressure that the water supply by the pump by a multi-stage pressure-reducing valve for the high differential pressure to 10kgf / cm ² or more of water pressure 8kgf / cm ² or less include for to reduce the pressure in the water supply pressure is provided at each of said individual lines Provides a water supply system using multi-stage pressure reducing valves for high differential pressure, characterized by individually supplying water to each floor at the water supply pressure of the building, but it is composed of one high pressure pump and water supply line to reduce equipment cost. In addition, there is an effect of supplying stable and comfortable water supply from the low-rise to the high-rise.

Description

Multi-stage pressure reducing valve for high differential pressure}

The present invention relates to a multi-stage pressure reducing valve, and more specifically, it is applied to water supply of a building, but it is composed of a single high-pressure pump and a water supply line to reduce the cost of equipment, and it is possible to supply stable and comfortable water supply from the lower floor to the upper floor. It relates to a multi-stage pressure reducing valve for differential pressure.

In general, when the pressure reducing valve is used to supply water to a building, it is possible to provide smooth water supply to each floor by minimizing the differential pressure generated according to the height.

Recently, many high-rise buildings are being built, and most of the water supply systems of these buildings are using a zoning method using a booster pump.

According to FIG. 1, as the number of floors of a building increases, the piping becomes more complicated.In order to supply water to the higher floors, a booster pump with a high pressure is required, and the number of pumps and areas of piping increase as the number of zones is divided, increasing the facility cost. There is a problem.

Referring to FIG. 1, it can be seen that the number of pipes and pumps increases as the number of floors increases. This is because, if one high-pressure pump is used from low to high floors, high pressure is supplied to the lower floors, and stable supply of water is impossible.

In addition, many problems arise when reducing high pressure to low pressure, but the biggest problem is vibration and noise generated by cavitation.

Cavitation (cavitation) refers to a phenomenon in which gas is generated in water when the pressure falls below the saturated vapor pressure of the liquid temperature when the liquid flows through a narrow neck such as an orifice when it flows through a narrow neck such as an orifice.

When the gas reaches the high-pressure area, it is forcibly disappeared and contained in the liquid, but at the same time, it is forcibly disappeared, causing severe shock, noise, and vibration, damaging pipes and accessories, and causing severe stress to residents due to noise and vibration. have.

KR 10-2008-0054301 A

In order to solve the above problems, an object of the present invention is to provide a multistage pressure reducing valve for high differential pressure capable of reducing costs by simplifying piping and pump facilities while preventing cavitation by reducing pressure in multiple stages according to the flow of water supply.

In addition, the present invention can be applied in various ways depending on the height of the building, so it is possible to reduce the cost of equipment by configuring a single high-pressure pump and a water supply line, and to supply stable and comfortable water supply from the lower floors to the upper floors. The purpose is to provide a multistage pressure reducing valve for differential pressure and a water supply system using the same.

In order to achieve the above object, the present invention can be connected to a water supply line supplying water supply and is connected to the first pressure reducing unit and the first pressure reducing unit capable of reducing the water supply pressure of the water supply, the first pressure reducing unit A second pressure reducing unit capable of reducing the water supply pressure of the passed water supply, wherein the first pressure reducing unit penetrates through a hollow to have an inlet and an outlet of the water supply; A pressure reducing piston coupled to the outlet side of the first pressure reducing housing, having a hollow portion formed therein, and protruding from the first pressure reducing housing; It is a piston type pressure reducing valve comprising a first pressure reducing disk provided at an inlet end of the pressure reducing piston and having a function of adjusting the degree of opening and closing of the flow path by operating left and right from the first pressure reducing housing. A second pressure reducing housing having a cross-sectional area smaller than a cross-sectional area of an end of the pressure reducing piston at an outlet side, and wherein the second pressure reducing unit has a flow path including an inlet and an outlet of the water supply so that the water supply can pass through; A stamp unit provided in the second pressure-reducing housing and capable of opening and closing the water passage through an elevating operation; A diaphragm provided on the upper portion of the stamp unit; And a spring provided above the diaphragm to pressurize the diaphragm. It provides a multistage pressure reducing valve for high differential pressure, characterized in that it comprises a spring.

By providing the present invention configured as described above, the present invention has the effect of reducing cost by simplifying piping and pump facilities while preventing cavitation by reducing the pressure in multiple stages according to the flow of water supply.

Also, depending on the height of the building, the pressure reducing valve can be applied by varying the degree of decompression according to the required pressure drop, so that the high-pressure pump, the water supply line, and the storage tank can be greatly simplified to reduce the cost of equipment. It has the effect of supplying stable and comfortable water supply to the upper part.

In addition, since cavitation can be prevented, the possibility of component damage or failure is reduced, thereby reducing the cost of management and maintenance of the water supply system in the future.

1 is a schematic diagram showing a conventional water supply system.
2 is a conceptual diagram showing the correlation of pressure changes according to distances that occur when fluid passes through a valve and an orifice.
Figure 3 is a schematic diagram showing a change in the water supply system according to the present invention.
Figure 4 is a cross-sectional view showing a multi-stage pressure reducing valve for high differential pressure according to the present invention.
5 is a cross-sectional view showing an operating state of a second pressure reducing unit in a multistage pressure reducing valve for high differential pressure according to the present invention.
6 is a cross-sectional view showing an operating state of the first pressure reducing unit in the multi-stage pressure reducing valve for high differential pressure according to the present invention.
7 is a chart showing the risk of cavitation of a conventional pressure reducing valve and a multistage pressure reducing valve for high differential pressure of the present invention as seen through a cavitation chart.
8 is a graph showing a pressure drop according to a distance when reducing pressure through a conventional pressure reducing valve and a multistage pressure reducing valve for high differential pressure of the present invention.
9 is a cross-sectional view of another embodiment showing a multi-stage pressure reducing valve for high differential pressure according to the present invention.
10 is a pressure drop graph according to a distance and a multistage pressure reducing valve for high differential pressure according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the same technical field can easily implement the present invention.

The multi-stage pressure reducing valve for high differential pressure of the present invention and the water supply system using the same are as shown in FIGS. 3 to 10, in which the spring type pressure reducing valve and the piston type pressure reducing valve 1201 are continuously connected according to the height of the building. By applying the multi-stage pressure reducing valve 1000 for use, the pressure pump 4000 and the water supply line 3000 are configured in a simpler configuration than the conventional one, so that the equipment cost can be reduced, and the water supply can be supplied stably and comfortably from the lower floor to the upper floor. We want to provide a water supply system that is available.

Referring to FIG. 2, when the water supply passes through the valve and is depressurized, a phenomenon as if flowing through an orifice tube occurs, and the pressure reducing valve passes through a narrow area and uses the principle of lowering the pressure, which causes cavitation to occur as the pressure drop increases. do.

When reducing the pressure (P ₁ ) to the required pressure (P ₂ ) using a pressure reducing valve, the pressure drops sharply as the pressure flows at the maximum speed in the narrowest place (Vena Contracta), and at this time, the saturated steam pressure ( When the pressure falls below Pv), cavitation occurs. The greater the pressure difference between P1 and P2, the higher the probability of cavitation.

At this time, the occurrence of cavitation in the water supply can be prevented by appropriately controlling the pressure drop during decompression using a cavitation index or chart.

식1)

Equation 1)

If the pipe pressure and the required set pressure are determined, the occurrence of cavitation can be predicted using the cavitation index calculation method in Equation 1.

In general, if the cavitation index is less than 0.5, the possibility of severe cavitation is predicted, and if the cavitation index is less than 0.8, the possibility of noise due to cavitation is predicted.

As shown in (a) of FIG. 7, the cavitation zone is divided into three zones, a cavitation zone, a noise zone, and a safety zone, and the greater the pressure difference between the primary and secondary sides (decompression), the more cavitation. And the probability of generating noise increases. That is, the probability of being located in the cavitation area increases as shown in the red dot in FIG. 7A.

For this reason, when reducing the pressure, gradually lowering the pressure in the pipe by using multi-stage depressurization rather than the first stage decompression prevents the occurrence of cavitation and is advantageous for the protection of pipes and accessories.

As shown in Figs. 4 to 6, the multistage pressure reducing valve 1000 for high differential pressure is connected to the building water supply line 3000 to reduce the water supply pressure, so that the second pressure reducing unit is formed of a spring type pressure reducing valve including a diaphragm. (1100) and; One or more first decompression units 1200 may be connected in series to the inlet side of the second decompression unit 1100 to reduce the water supply pressure before passing through the second decompression unit 1100.

Here, the first pressure reducing unit 1200 includes a first pressure reducing housing 1210 connected to the second pressure reducing unit 1100, a pressure reducing piston 1220 provided inside the first pressure reducing housing 1210, and It may be composed of a piston type pressure reducing valve 1201 including a first pressure reducing disk 1230.

In addition, the second pressure reducing unit 1100 may be configured as a spring type pressure reducing valve.

As an embodiment, one piston-type pressure-reducing valve 1201 is connected to a spring-type pressure-reducing valve, or one or more of the piston-type pressure-reducing valves 1201 may be connected continuously to constitute the multistage pressure-reducing valve 1000 for a high differential pressure of the present invention.

The piston-type pressure reducing valve 1201 may include a first pressure reducing housing 1210, a pressure reducing piston 1220 and a first pressure reducing disk 1230 provided inside the first pressure reducing housing 1210, The first pressure reducing unit 1220 may include one or more than one piston type pressure reducing valve 1201.

As an embodiment, the first pressure reducing housing 1210 has a threaded portion 1211 formed around both ends so as to be fastened and coupled to a pipe connection, and a space portion 1213 is formed inside the first pressure reducing housing 1210 so as to be coupled to each other, and the inlet and outlet of the water supply. Has.

The pressure reducing piston 1220 is insertedly coupled to the outlet side of the first pressure reducing housing 1210, a hollow part 1221 is formed through it, and provided to be movable along the inner wall of the first pressure reducing housing 1210 Can be.

As an embodiment, the external shape of the pressure reducing piston 1220 is stepped along the length direction, so that a front end portion is inserted into the outlet side of the first pressure reducing housing 1210, and a rear end portion of the first pressure reducing housing 1210 It is formed to be exposed to the outside, and a shear O-ring 1222 and a shear backup ring 1223 are provided around the front end of the pressure reducing piston 1220 to prevent leakage of water supply, and a leakage of water supply is prevented around the rear end. For this purpose, a rear O-ring 1224 and a rear protein backup ring 1225 may be provided.

In addition, the first pressure reducing disk 1230 is accommodated in the space 1213 and integrally provided at the end of the pressure reducing piston 1220 to the left and right in a flow path at the inlet side of the first pressure reducing housing 1210. It operates as to control the degree of opening and closing of the flow path, and the pressure can be adjusted. The inlet (front end) cross-sectional area of the decompression piston 1220 is smaller than the outlet side end (rear end) of the decompression piston 1220.

According to Pascal's principle, the force of the water supply can be expressed as the product of the applied pressure and the applied cross-sectional area, and the pressure can be adjusted as the piston moves by the force of the water supply.

That is, when the Pascal principle is applied to the piston-type pressure reducing valve 1201, a value obtained by multiplying the pressure P1 of the water supply passing through the inlet side and the area A1 of the first pressure reducing disk 1230 (force on the inlet side ; When F1) and the pressure of the water supply passing through the outlet (P2) and the area (A2) of the outlet-side end (rear end) of the pressure reducing piston 1220 (exit-side force; F2) are equal, both sides The pressure of the pressure reduction piston 1220 does not move in a state of equilibrium. When the inlet-side force F1 of the piston-type pressure reducing valve 1201 is relatively larger than the outlet-side force F2, the first pressure reducing disk 1230 opens the inlet-side flow path, and the piston-type pressure reducing valve 1201 When the inlet-side force F1 of is relatively small compared to the outlet-side force F2, the pressure of the water supply can be reduced by operating a piston in which the first pressure reducing disk 1230 closes the inlet-side flow path.

The operating principle of the piston-type pressure reducing valve 1201 will be described in detail with reference to FIG. 6. The diameter of the first pressure reducing disk 1230 through which water is introduced from the pressure reducing piston 1220 or the diameter of the inlet (front end) of the pressure reducing piston 1220 is D1, and the pressure of the pressure reducing piston 1220 from which the water supply is depressurized The outlet side (rear end) diameter is defined as D2, the pressure of the water supply before depressurization is defined as P1, and the pressure of the water supply that has passed through the first pressure reducing disk 1230 is defined as P2.

At this time, the diameter of the inlet side of the pressure reducing piston 1220 or the area A1 of the diameter D1 of the portion of the first pressure reducing piston 1230 and the diameter of the outlet side of the pressure reducing piston 1220 (D2) The reduction ratio of the piston type pressure reducing valve 1201 is determined by the area A2 ratio. That is, by adjusting the diameter ratio between D1 and D2 or the area ratio between A1 and A2, the pressure reduction ratio of the piston type pressure reducing valve 1201 can be easily set.

That is, when the force applied to the decompression piston 1220 is P1 × A1 = P2 × A2, the pressure is in equilibrium and the decompression piston 1220 does not move.

When the pressure (P2) of the water supply passing through the outlet end of the decompression piston 1220 or the first decompression disk 1230 increases and becomes P1 × A1 <P2 × A2, the force acts toward the inlet side, and the right figure in FIG. As described above, the inlet end of the first pressure reducing disk 1230 or the pressure reducing piston 1220 closes the inlet flow path of the water supply to lower the pressure of P2.

On the contrary, when the pressure of P2 is lowered and the state of P1 × A1> P2 × A2, the force acts in the direction of P1, and the pressure of P2 increases as the first pressure reduction disk 1230 opens as shown on the left of FIG. 6.

With this action, the decompression ratio is determined by the diameter ratio of the decompression piston 1220, and the decompression ratio can be adjusted by changing the diameter.

In addition, the first pressure reducing unit 1200 may be configured by continuously connecting one or two or more piston-type pressure reducing valves 1201.

That is, since the water supply pressure of the pressure pump 4000 is relatively high in the lowermost floor of the building 6000, two or more piston-type pressure reducing valves 1201 of the first pressure reducing unit 1200 are connected and installed continuously to provide high pressure reduction. It is preferable to install the piston-type pressure reducing valve 1201 to reduce the number of connections, since the water supply pressure of the pressure pump 4000 decreases as the rain is obtained and, conversely, the water goes to the upper floor of the building 6000.

On the other hand, the second pressure reducing unit 1100 includes a second pressure reducing housing 1110 having a flow path including an inlet and an outlet so that water can pass through the spring type pressure reducing valve, and the inside of the second pressure reducing housing 1110 Includes a stamp unit 1120 capable of opening and closing the flow path by an elevating operation, a diaphragm 1140 provided on the upper portion of the stamp unit 1120, and a spring 1130 pressing the diaphragm 1140 thereon. can do.

As an embodiment, the second pressure reducing unit 1100 further includes a spring housing 1150 covering the spring 1130, and an adjustment unit 1160 adjusting the elastic force of the spring 1130 by tightening a bolt and a nut. Can include.

As an embodiment, referring to FIG. 4, the stamp unit 1120 is provided inside the inlet side of the second pressure reducing housing 1110, a diaphragm 1140 at the top, and a second pressure reducing disk 1170 at the bottom. It may include a stamp 1121 to be coupled to each.

In addition, the stamp unit 1120 includes a stamp guide 1122 for guiding the vertical movement of the stamp 1121, a disk holder 1123 to which the second pressure reducing disk 1170 is coupled, and a secondary pressure reducing sheet 1124. ) May be further included.

The stamp guide 1122 is fixed inside the second pressure reducing housing 1110 and guides the rising and falling of the stamp 1121.

The disk holder 1123 holds the second pressure reducing disk 1170 provided at the lower end of the stem 1121.

The second pressure reducing sheet 1124 is attached to the stamp guide 1122 and provided inside the inlet side of the second pressure reducing housing 1110 and may include a filtering net 1125.

In addition, a pair of stamp fixing nuts 1126 are fastened to the upper/lower ends of the stem 1121 to fix the diaphragm 1140 and the second pressure reducing disk 1170.

A stamp guide O-ring 1127 for preventing water from leaking into the upper diaphragm 1140 may be provided between the stamp guide 1122 and the second pressure reducing housing 1110.

Meanwhile, a diaphragm plate 1128 for preventing damage to the diaphragm 1140 by contact with the spring 1130 is provided on the upper portion of the diaphragm 1140, and a spring housing 1150 along the rim of the diaphragm 1140 A diaphragm guide 1129 may be provided that is coupled to and prevents the diaphragm 1140 from rotating as the spring housing 1150 is fastened.

In addition, the adjustment unit 1160 may be configured to include an adjustment bolt 1161, an adjustment nut 1163, and a spring seat 1165.

The adjustment bolt 1161 is coupled through the upper end of the spring housing 1150 by fastening, so as to move up and down according to the rotation direction.

The adjustment nut 1163 may be provided on the upper end of the spring housing 1150 in a vertical correspondence, and may be fastened to the adjustment bolt 1161 to fix the height of the adjustment bolt 1161.

The spring sheet 1165 may be provided between the spring 1130 and the lower end of the adjustment bolt 1161 to transmit pressure by the adjustment bolt 1161 to the spring 1130.

Referring to FIG. 5, on the left, the second pressure reducing disk 1170 of the stamp unit 1120 opens the flow path of the water supply in the second pressure reducing housing 1110 to pass water, and the right is the first pressure reducing disk 1120 of the stamp unit 1120. 2 is a view in which the pressure reducing disk 1170 closes the flow path of the water supply in the second pressure reducing housing 1110 to block the flow of the water supply. The second pressure reduction in the second pressure reducing unit 1100 is set according to the force of the spring 1130, and when the spring 1130 is pressed according to the degree of adjustment of the adjusting unit 1160, the elastic force of the spring 1130 Force to pressurize the diaphragm 1140 is generated.

The pressing force of the spring 1130 is defined as Fs, and this Fs is transmitted as a force pressing the second pressure reducing disk 1170 through the stamp unit 1120.

As the water supply passes through the second pressure reducing disk 1170, the second pressure is decompressed. If the pressure P3 is at this time, the pressure P3 is applied to the lower portion of the diaphragm 1140 through the sensing tube 1111 of the second pressure reducing housing 1110. Is detected on.

Therefore, the force to lift the diaphragm 1140 is transmitted by the product of P3 and the area A3 of the effective diameter D3 of the diaphragm 1140, and the second pressure reducing disk 1170 is lifted through the stamp unit 1120. It will be raised.

That is, the second pressure reducing disk 1170 opens and closes the flow path with the force pressed by the spring 1130 and the force lifted by the diaphragm 1140 to control the secondary decompression. If P3 × A3 is equal to Fs, the force is The balance is maintained so that the second pressure reduction disk 1170 does not move.

When the pressure P3 passing through the second pressure reducing disk 1170 increases and the applied force becomes P3 X A3> Fs, the diaphragm 1140 rises and the second pressure reducing disk 1170 as shown on the right side of FIG. Rises, the flow path is blocked, and P3 is lowered.

On the contrary, when P3 is lowered and the acting force becomes P3 × A3 <Fs, as shown in the left figure of FIG. 5, the stamp unit 1120 descends by the pressing force of the spring 1130, and the second pressure reducing disk 1170 flows through the flow path. Will be opened.

When the adjustment unit 1160 is adjusted and pressed, the elastic force of the spring 1130 is increased by Hook's law (elastic force of the spring = spring constant X spring length change).

Therefore, when the elastic force increases, a larger force is required to close the second pressure reducing disk 1170, but since the effective diameter D3 of the diaphragm 1140 does not change, P3 increases.

Therefore, the second decompression of the second decompression unit 1100 can easily adjust the set pressure by the elastic force (pressing amount) of the spring 1130, and accordingly, the decompression ratio in the second decompression unit 1100 can be easily adjusted. Can be adjusted.

That is, in the multi-stage pressure reducing valve for high differential pressure according to the present invention, the ratio of the cross-sectional area of the inlet end of the pressure reducing piston 1220 and the cross-sectional area of the outlet end of the pressure reducing piston 1220 and the elastic force of the spring 1130 are combined together. Or, it is possible to easily adjust the decompression ratio of the water supply by adjusting each.

If the multi-stage pressure reducing valve 1000 for high differential pressure configured as described above is applied to the water supply line 3000 of the building 6000, the pressure pump 4000 and the water supply line 3000 are conventionally used as shown in FIG. 3 (left side of FIG. 3). Even if the configuration is simple compared (right side of Fig. 3), stable and comfortable water supply can be provided from the lower floor to the upper floor.

That is, in the past, in order to prevent cavitation of the pump, a separate pump had to be installed, such as supplying a low pressure in the low-rise part and a high pressure in the high-rise part, and sometimes there was a design difficulty in having a separate water tank and pump in the middle of a building. , Since the water supply system using the multistage pressure reducing valve 1000 for high differential pressure of the present invention prevents cavitation by decompressing the water supply in multiple stages, it is provided in the building 6000 even if there is no reservoir and pump facility of a complex configuration as shown in FIG. A storage tank (2000) that stores water supplied through (7000) may be sufficient.

A water supply line 3000 leading to the highest floor may be connected to the storage tank 2000, and a pressure pump that supplies water at a set pressure along the water supply line 3000 to the water supply line 3000 at the outlet side of the storage tank 2000 4000 may be provided.

Each individual line 5000 connected to the water supply line 3000 may be provided on each floor of the building 6000.

Further, the individual line 5000 may be provided with a multi-stage pressure reducing valve 1000 for a high differential pressure according to the present invention for reducing the water supply pressure.

In one embodiment, the water supply system is configured as described above, the high-pressure pump (4000) in the multi-stage pressure reducing valve 1000 powers of 8kgf / cm ² or less by the above-mentioned high pressure difference to 10kgf / cm ² or more of water pressure that the water supply by When water is supplied individually to each layer by pressure, it can be reliably decompressed without cavitation.

Hereinafter, a principle in which cavitation does not occur in the multi-stage valve 1000 for high differential pressure according to the present invention will be described with reference to FIG. 8.

In general, when the water supply flows to the pressure reducing valve, the flow velocity is increased in the narrowest neck (Vena contracta) of the valve, so the pressure decreases lower than the inlet or outlet of the valve by the Bernoulli principle.

When depressurizing the water supply while passing through the inlet and outlet of the pressure reducing valve, a pressure graph is drawn as shown in FIG. 8.

As shown in (a) of FIG. 8, a graph of pressure drop through the conventional pressure reducing valve shows that a phenomenon in which the pressure is momentarily lowered below the saturated vapor pressure in the valve neck (Vena contracta) occurs, and cavitation occurs at this time.

On the other hand, referring to the pressure drop graph when performing the two-stage decompression according to the present invention as shown in Fig. 8(b), the saturation vapor pressure is lowered even at the valve neck during the first and second decompression using multi-stage decompression. It shows that the pressure is prevented from falling.

Therefore, when the pressure is reduced in multiple stages as in the present invention, the occurrence of cavitation is prevented so that the water supply can be used more stably.

For example, in the household of the building 6000 that uses the high pressure pump 4000 of 20kgf/cm² and decompresses it to 3kgf/cm² or less, severe cavitation occurs when only the first stage of decompression is performed.

To solve this problem, in the past, it was necessary to design the piping to prevent cavitation by dividing the zone for each floor.

That is, as shown in Fig. 7 (a), when only one-stage decompression is performed, a single decompression of 20kgf/cm² to 3kgf/cm² corresponds to the risk position in the cavitation chart, and if the first-stage decompression ratio is 5:2, 2 However, if the set pressure at the decompression outlet is set to 3kgf/cm², the pressure of 20kgf/cm² at the first stage of decompression is reduced to 8kgf/cm², and the pressure of 8kgf/cm² at the second stage of decompression is reduced to 3kgf/cm². Looking at the cavitation table as shown in (b) above, since it belongs to the safety zone from the occurrence of cavitation, it is not necessary to install a separate water storage tank or pump by dividing the pipe by zone, thereby reducing the cost of equipment.

That is, as shown in (b) of FIG. 7, when reducing pressure in multiple stages from 20kgf/cm² to 3kgf/cm², the high differential pressure multistage pressure reducing valve 1000 usable at a high differential pressure out of the risk position in the cavitation chart is a water supply line By simplifying (3000), unnecessary equipment costs can be reduced and cavitation can be prevented to provide a comfortable living environment.

In addition, as another embodiment of the present invention, when the difference between the pressure input to the pressure reducing valve and the set pressure at the outlet side increases, multi-stage pressure reduction may be implemented by increasing the number of pressure reducing stages as shown in FIGS. 9 and 10.

If the pressure difference between the inlet side and the outlet side increases, the probability of occurrence of cavitation increases. Therefore, by increasing the number of decompression, it is possible to prevent the pressure from falling below the saturated vapor pressure when the pressure at the valve neck (Vena contracta) decreases.

Referring to FIG. 9, the first pressure reducing unit 1200 according to another embodiment of the present invention is configured by continuously connecting two or more piston-type pressure reducing valves 1201. Therefore, the pressure reducing effect of the piston type pressure reducing valve 1201 may be increased by overlapping and applying the pressure reducing ratio. The first pressure reducing housing 1210 may be integrally formed, or a plurality of the first pressure reducing housing 1210 may be formed to be connectable. Other components of the present embodiment are substantially the same as in FIG. 4, so the same reference numerals are used, and duplicate descriptions are omitted.

An upper part of FIG. 10 is a shape of a three-stage pressure reducing valve according to another embodiment of the present invention, and a lower part of FIG. 10 is a graph representing a pressure change in a three-stage pressure reducing valve according to another embodiment of the present invention.

As shown in Fig. 10, referring to the cross-sectional view (A) of a multistage pressure reducing valve composed of three stages including one spring type pressure reducing valve and two piston type pressure reducing valves 1201 and a pressure distribution graph according to distance, It can be seen that even in the case of a higher pressure difference, decompression can be performed without cavitation. In addition, by further applying a piston-type pressure reducing valve, a pressure reducing valve of three or more stages can be configured, and a higher pressure difference can be reduced.

In addition, depending on the height of the building 6000, the number of connections of the piston-type pressure reducing valve 1201 connected to the high differential pressure multistage pressure reducing valve 1000 may be differentially applied for each floor. For example, on the first floor of a building, it can be applied by reducing the number of n levels, and decreasing the number of stories as the number of floors increases.

By providing the present invention configured as described above, the number of pressure reducing valves can be variously applied according to the height of the building, so that the configuration of the pressure pump and the water supply line can be simplified to reduce the cost of equipment, and it is stable from the low floor to the high floor. It has the effect of providing a pleasant water supply.

The terms and words used in the present specification and claims described above should not be construed as being limited to their usual or dictionary meanings, and the present inventors appropriate the concept of terms to describe their own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention on the basis of the principle that it can be defined.

Therefore, the configurations shown in the drawings and embodiments described in the present specification are only one of the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention, and thus can be replaced at the time of application. It is to be understood that there may be a variety of equivalents and variations that may exist.

1000: Multi-stage pressure reducing valve for high differential pressure
1100: second decompression unit
1110: second pressure reducing housing
1111: detective tube
1120: stamp unit
1121: stamp
1122: stamp guide
1123: disk holder
1124: secondary pressure reduction sheet
1125: filter screen
1126: stamp fixing nut
1127: stamp guide O-ring
1128: diaphragm plate
1129: diaphragm guide
1130: spring
1140: diaphragm
1150: spring housing
1160: control unit
1161: adjustment bolt
1163: adjustment nut
1165: spring seat
1170: second decompression disk
1200: first decompression unit
1210: first pressure reducing housing
1211: threaded portion
1213: space part
1201: piston type pressure reducing valve
1220: decompression piston
1221: hollow section
1222: shear O-ring
1223: shear backup ring
1224: rear O-ring
1225: posterior protein up ring
1230: First decompression disk
2000: water tank
3000: water supply line
4000: pressure pump
5000: individual line
6000: building
7000: water pipe
A1, A2, A3: area
D1, D2, D3: diameter
F1, F2, Fs: force
P1, P2, P3: pressure

Claims (3)

A first pressure reducing unit 1200 capable of being connected to a water supply line supplying water and reducing a water supply pressure of the water supply; And
And a second pressure reducing unit 1100 connected to the first pressure reducing unit 1200 and capable of reducing the water pressure of the water supply passing through the first pressure reducing unit 1200,
The first pressure reducing unit 1200,
A first pressure reducing housing (1210) penetrating through a hollow and having an inlet and an outlet of the water supply;
A pressure reducing piston 1220 coupled to the outlet side of the first pressure reducing housing 1210, having an inside formed through the hollow, and movable along the inner wall of the first pressure reducing housing 1210;
A piston-type pressure reducing valve 1201 comprising a first pressure reducing disk 1230 provided at an inlet end of the pressure reducing piston 1220 and capable of adjusting the degree of opening and closing of the flow path at the inlet side of the first pressure reducing housing 1210 Is,
The cross-sectional area of the inlet end of the pressure reducing piston 1220 is smaller than the cross-sectional area of the outlet end of the pressure reducing piston 1220,
The second pressure reducing unit 1100,
A second pressure reducing housing 1110 having a flow path including an inlet and an outlet of the water supply so that the water supply can pass through;
A stamp unit (1120) provided in the second pressure reducing housing (1110) and capable of opening and closing the flow path by an elevating operation;
A diaphragm 1140 provided on the upper portion of the stamp unit 1120; And
It includes a spring (1130) provided on the upper portion of the diaphragm (1140) to pressurize the diaphragm (1140),
A multistage pressure reducing valve for high differential pressure, characterized in that an outlet of the first pressure reducing housing 1210 and an inlet of the second pressure reducing housing 1110 are connected.
The method according to claim 1,
The first depressurization unit 1200,
A multistage pressure reducing valve for high differential pressure, characterized in that two or more piston-type pressure reducing valves 1201 are continuously connected.
The method according to claim 1,
Characterized in that by adjusting the ratio of the cross-sectional area of the inlet end of the pressure reducing piston 1220 and the cross-sectional area of the outlet end of the pressure reducing piston 1220 or the elastic force of the spring 1130 to control the pressure reduction ratio of the water supply Multi-stage pressure reducing valve for high differential pressure.

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