JP2003067057A - Pressure-reduction water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the cost for pressure-reduction water supply for water sprinkling in a fruit farm by performing the pressure-reduction water supply through a plurality of stages by a set of pressure reducing valves. SOLUTION: A cylinder type pressure reduction valve 10 is interposed in a circular channel 1 and pilot valves 50a and 50b for high/low pressure setting are added to the pressure reducing valve 10. The pressure reducing valve 10 can have its opening position adjusted by controlling the water pressure P3 in a cylinder 16 and through the adjustment, the water supply amount (water supply pressure) is adjusted in two high and low stages. Outflow-side water pressure is applied to the pilot valves 50a and 50b, and according to the pressure, the inside of the cylinder 16 is linked or not linked with the outflow side. Low-pressure water supply is controlled by the high-pressure side pilot valve 50b when a solenoid valve 61 is closed, that is opened by controlling the water pressure by the high-pressure side pilot valve 50b. When an excessive water amount (excessive pressure reduction) is reached, that state is detected from the differential pressure of an orifice 2 and then the solenoid valve 61 is closed to start the low-pressure water supply. Consequently, trouble such as abnormal water sprinkling on a downstream side is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reduced pressure water supply device for performing different water supply such as watering in an orchard or irrigation in a field, when the water supply amount differs between daytime and nighttime. .

[0002]

2. Description of the Related Art As a water sprinkling (irrigation) device of this type, there is one described in JP-A-60-263786. This device opens and closes the valve seat between the primary side and the secondary side, and at the same time, a differential pressure type decompression in which a valve element whose diameter on the opposite side is larger than the diameter on the valve seat side is slidably held in the cylinder part. A valve body provided with a valve, and a valve body that detects the pressure on the secondary side and slides on each of the valve boxes having a valve seat formed between the communication port connected to the secondary side and the connection port; A high-pressure pilot valve and a low-pressure pilot valve accommodating a pressure setting spring that urges the valve element in the opening direction by setting the force against the pressure on the secondary side to either strong or weak are provided, and An outer cylinder is fixed to one end wall, and a switching rod having a hollow portion whose one end on the cylinder portion side is open is fitted to the outer cylinder, and the cylinder portion is always connected to the connection port of the low pressure pilot valve. An annular passage for connecting the hollow portion to the connection port of the high-pressure pilot valve Is independently formed between the outer cylinder and the switching rod, and is inserted into the hollow portion to open a space between the open end of the hollow portion and the cylinder portion by an axial sliding operation. Is provided, the valve rod is connected to the valve element of the differential pressure reducing valve, and the valve is formed by the valve rod, the outer cylinder, and the switching rod.

In this device, control participation of both pilot valves for high pressure setting and low pressure setting is switched by a valve composed of the switching rod or the like, and the degree of separation (opening degree) between the valve body of the pressure reducing valve and the valve seat is adjusted. Then, a large amount of water and a small amount of water are sent.

Further, as another apparatus, Japanese Patent Laid-Open No. 11-14
7057, etc. This device
The water supply pipeline is provided with a main opening / closing valve, and a bypass pipeline having a sub opening / closing valve in parallel with the main opening / closing valve is provided.

This device controls the main and sub open / close valves by a solar cell drive controller, and opens the main open / close valve and closes the sub open / close valve in the daytime to send high-pressure water, that is, a large flow rate, at night. In this case, the main opening / closing valve is closed and the auxiliary opening / closing valve is opened to supply low-pressure water, that is, a small flow rate.

[0006]

The former conventional technique is mechanically switched between large amount of water and small amount of water in accordance with the pressure on the secondary side, which is advantageous in terms of cost. . However, the switching is performed by opening and closing a valve including a valve rod connected to the valve body of the differential pressure reducing valve, an outer cylinder fixed to the pressure reducing valve, and a switching rod fitted in the outer cylinder. Since this valve opening and closing action is mechanically performed based on the secondary pressure, if for some reason the secondary side becomes low pressure and a large amount of water is sent, the large amount of water is inconvenient, for example, abnormal watering. However, a large amount of water will be continued as a secondary demand.

On the other hand, in the latter conventional technique, an electromagnetic type pressure reducing valve is used, and the pressure reducing valve is controlled by a detection signal of the primary pressure or the secondary pressure to prevent unnecessary (inconvenient) large-scale water supply. it can. However, by installing a bypass pipe, 2
The use of individual pressure reducing valves, and the multiple pressure reducing valves,
Inevitably, many pilot valves (pressure setting valves) for the control are required. Since many valves are required, the cost of each valve is required, and the piping between them is complicated, resulting in cost increase. Also, maintenance costs are high. For this reason, today, when cost reduction is called for,
It is desired to reduce their prices.

An object of the present invention is to reduce the cost of this type of reduced pressure water supply device and to automatically prevent the inconvenient mass water supply.

[0009]

In order to achieve the above object, the present invention first adjusts the amount of flowing water by the opening degree of the valve hole. This is because if the degree of opening can be performed in stages, the flow rate can be adjusted (reduced pressure) in multiple stages with one valve, leading to cost reduction.

Next, according to the present invention, the contact and separation of the valve body with respect to the valve seat are performed by a cylinder type, and the degree of contact and separation of the valve body (the degree of opening of the valve hole) is determined by the pressure difference between the pressure surfaces on both sides of the piston. I decided to do it. This is because the stop position of the piston can be changed by changing the water pressure in the cylinder. Further, the piston-operated valve body is suppressed in vibration due to resistance of the piston packing portion and sliding of the piston in the cylinder, and damage and cavitation are also suppressed as much as possible.

Further, according to the present invention, the water pressure in the cylinder is determined by the pressure setting valve operating with the water pressure on the outflow side (secondary side). If the set pressure of the pressure setting valve is set to the required pressure on the outflow side, the water pressure in the cylinder at the time when the outflow side reaches the required pressure is determined, and the water pressure (water amount) on the outflow side is maintained. Because.

Further, according to the present invention, a plurality of such pressure setting valves are provided and the set pressures are set in a required plurality of stages. By selectively operating each of the pressure setting valves, the opening degree of the valve hole of the valve capable of adjusting the flow rate can be appropriately selected, and a plurality of stages of water flow can be performed.

Further, according to the present invention, an alternative operation of the pressure setting valve is performed by the electric switching valve.
This is because the electrically operated valve can be easily controlled by a power source such as a solar cell and can be automatically controlled by a water pressure detection signal on the inflow side (primary side) or the outflow side.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION As an embodiment of the present invention, a pressure reducing valve is provided in a pipe water passage, and the pressure reducing valve reduces the secondary pressure in a plurality of stages to feed water. , The inside of the valve box is divided into an inflow chamber and an outflow chamber by a partition wall,
A valve hole is formed in the partition wall, a cylinder is provided in the outflow chamber, and a piston having a valve body is internally mounted in the cylinder so as to be movable in the axial direction of the cylinder. It opens and closes by contacting with and separating from the valve seat of the hole, and the pressure reducing valves are provided with pressure setting valves of the number of the pressure reducing stages, and each pressure setting valve is connected to the outflow side and the inside of the cylinder. When the pressure on the outflow side becomes less than the respective set value, the cylinder and the outflow side are communicated, and when the set value is reached, the cylinder is closed and the pressure inside the cylinder is adjusted. The position of the piston is determined to adjust the gap between the valve element and the valve seat, and the secondary pressure is reduced in a plurality of stages by adjusting the gap, and the pressure from the inside of the cylinder to each pressure setting valve is adjusted. Communication from communication passage or outflow side The electric switching valve provided in the road, in response to a command from the control unit, may be employed a configuration which is adapted to participate in alternatively pressure adjusting in the cylinder each pressure setting valve with this switching valve.

In this structure, which of the communication passage from the inside of the cylinder to the pressure setting valve or the communication passage from the outflow side to which the electric switching valve is provided is appropriately selected in consideration of switching characteristics, piping and the like. Set to. Also, the power supply for the control unit,
You can use a general power source, but you can use batteries and solar cells in fields.

In the pressure reducing valve, the lower end of the piston is shaped so as to project downward in a saw blade shape over the entire circumference thereof, and the saw blade portion is slidably fitted in the valve hole. When the valve body and the valve seat have a very small gap between them, it is preferable that water is made to flow from the saw-toothed gap. In this way, if the blade has a saw-toothed shape, at a small opening, the circulating pressure water diffuses and flows down from the gap between the sawtoothed portions existing around the entire circumference into a shower shape to suppress cavitation. As the saw blade shape, not only the triangular shape shown in FIG. 4 but also a polygonal shape such as a square shape and a pentagonal shape and a semicircular shape can be adopted. Also, the intervals and sizes of the saw blades are set appropriately by experiments and the like.

Decompression adjustment is performed at high pressure (high flow rate water supply) during the day,
In the case of two types such as low pressure (low flow rate water supply) at night,
Two types of pressure setting valve, high and low, are set, and an electromagnetic on-off valve serving as the electrically operated switching valve is provided in a communication passage from the outflow side to the high pressure setting valve. A configuration may be adopted in which the outflow side communicates only with the low pressure setting valve when closed, and the outflow side communicates with the high pressure setting valve when the electromagnetic opening / closing valve is opened.

In this structure, when the outflow side communicates with the high pressure setting valve, the pressure in the cylinder is controlled by the high pressure setting valve even if the low pressure setting valve communicates with the outflow side. Therefore, when setting the high pressure, the low pressure setting valve does not necessarily need to be in communication with the outflow side.

This type of pipe water channel may be excessively decompressed (excessive amount of water) due to some circumstances such as water theft and abnormal water sprinkling. At this time, it is necessary to detect the excessive decompression and prevent inconveniences such as water theft and abnormal water sprinkling. Therefore, in each of the above configurations, a flow meter is provided in the inflow side pipe water passage, and if the detected flow rate exceeds a required value, the set pressure from the pressure setting valve currently participating in the pressure adjustment in the cylinder is set. It is preferable to switch to the pressure setting valve on the lower pressure side so that the pressure setting valve on the lower pressure side participates in the pressure adjustment in the cylinder.

If an orifice and a differential pressure gauge with a contact point for detecting the differential pressure are used as the flowmeter, the differential pressure setting (setting during operation) becomes easy and accurate, and if necessary, it is possible to move to the monitoring place. A "flow rate" signal can be emitted.

[0021]

EXAMPLE An example is shown in FIG. 1 to FIG. 6, and this example is installed in a water channel 1 for watering or irrigation in an orchard or the like, and an orifice 2 and an orifice 2 are provided in the water channel 1. A pressure reducing valve 10 is provided. The differential pressure before and after the orifice 2 is detected by the differential pressure gauge 3 with a contact, and the differential pressure is a constant value,
For example, when the pressure reaches a level such that some downstream equipment is damaged, the contact of the differential pressure gauge 3 is closed and the signal is sent to the operation panel 4. A solar cell 5 and a battery 6 are connected to the operation panel 4, and electric power is appropriately supplied from both 5 and 6.

The pressure reducing valve 10 is the same as in the above-mentioned Japanese Patent Laid-Open No. 60-2637.
The structure is similar to that of the differential pressure type disclosed in Japanese Patent Publication No. 86, and the inside of the valve box 11 is divided by a partition 12 into an inflow chamber 13 and an outflow chamber 14, and a valve hole 15 is formed in the partition 12. A cylinder 16 is provided in the outflow chamber 14, and a cylindrical piston 17 serving as a valve body is slidably fitted in the cylinder 16 up and down. The piston 17 is watertightly supported by the valve box 11 via one packing 18, and is watertightly supported by the cylinder 16 via another packing 19. Therefore, it moves without swinging in the cylinder axis direction.

The lower surface of the piston 17 is closed, a fountain hole 30 is formed in the center thereof, and a valve body gasket 21 is provided on the peripheral edge of the lower surface. The gasket 21 is pressed against the valve seat 22 around the valve hole 15 to close the valve hole 15. That is, the valve is fully closed. A guide 23 made of SCS13 is bolted to the lower part of the piston 17, and the guide 23 is composed of a cylindrical base portion 23a and a leg 23b that divides the quartile into four parts, and the leg 23b is formed in the valve hole 15 (valve seat 22). The piston 17 is prevented from swinging by making sliding contact with the inner surface. Guide 2
The entire lower surface of the base portion of No. 3 has a triangular saw blade shape, and when the valve body (piston 17) is slightly opened from the valve seat 22, it passes through the gap 24 a of each saw blade portion 24. Then, water flows from the inflow chamber 13 to the outflow chamber 14. At this time, cavitation is unlikely to occur because a large number of the gaps 24a form a shower and diffuse downflow.

The fountain hole 30 on the lower surface of the piston 17 is formed by the center hole of the fountain hole fitting 32 at the center of the diaphragm 31.
The fountain hole fitting 32 is fixed to the diaphragm 31 by screwing a nut 34 through a washer 33. The diaphragm 31 uses the presser foot 35 to guide the guide 23 (the base 23
It is fixed to the piston 17 by screwing it to a). The fountain hole 30 has a needle 36 standing on the bottom surface of the valve box 11.
The needle portion 36a of the needle 36a penetrates through the needle portion 36a, and the needle portion 36a gradually narrows toward the tip, and the base portion shown in FIG.
When the piston 17 gradually rises from the closed state in which it is fitted tightly to 0, the outer surface of the needle portion 36a and the fountain hole 30
The gap on the inner surface of the nozzle gradually widens, and the amount of fountain gradually increases to provide a buffering effect.

That is, the piston 17 is raised when the lower surface pressure of the diaphragm 31 becomes higher than the upper surface pressure, but at the beginning of its operation, the diaphragm 31 swells upward, and the gap between the needle portion 36a and the fountain hole 30 is preliminarily increased. To loosen a little, a sudden change in the gap (a sudden gap formation)
Is not generated, no impact noise is generated, and the piston 17 is less likely to vibrate (sway). Further, when the needle 36 closes the valve, the needle 36 gradually becomes thicker toward the base portion, so that the amount of water inflowing into the cylinder 16 is limited as the valve approaches the valve closing. The descending speed (closing direction) becomes slower, water hammer is prevented, and rapid chattering phenomenon is prevented.

The upper surface of the piston 17 has a radial arm 41.
Are equidistantly provided, and an opening degree indicating rod 43 is erected at the center thereof via a nut 42. This opening indicating rod 43
Is penetrated through the valve box 11 and inserted into the transparent cylinder 44, and the degree of rise of the piston 17, that is, the degree of opening of the valve hole 15 can be determined by comparing the degree of opening indicating rod 43 with the degree of opening marked on the transparent cylinder 44. Shown. The transparent cylinder 44 is screwed to the upper lid of the valve box 11 via the seat fitting 45.

A pilot valve serving as a pressure setting valve is attached to the pressure reducing valve 10, and one pilot valve 50a is provided.
Is for low pressure (low flow rate) setting, and the other pilot valve 50b is for high pressure (high flow rate) setting. Both pilot valves 50a,
50b has a diaphragm 52 inside a valve box 51, a coil spring 53 is provided on one side of the diaphragm 52, and a valve body 54 is provided on the other side thereof. The undulation of the diaphragm 52 causes the valve body 54 to contact the valve seat 54a. Let go. A pressure guiding pipe 55 is guided from the outflow chamber 14 of the pressure reducing valve 10 to the diaphragm chamber, and an electromagnetic opening / closing valve 61 is provided only in the pressure guiding pipe 55 to the high pressure setting pilot valve 50b. The on-off valve 61 may be a motor-driven electric valve.

The pressure chambers of both pilot valves 50a and 50b are connected to a pressure guiding pipe 56 communicating with the inside of the cylinder 16 through the pressure guiding pipe 55 and the seat fitting 45 of the transparent cylinder 44, and the valve body 54 is connected. Is opened away from the valve seat 54a, the pressure guiding tubes 55 and 56 communicate with each other, and the valve body 5
When 4 is pressed against the valve seat 54a to close the valve, both pressure guiding pipes 55 and 56 are disconnected. This pilot valve 50a,
By appropriately selecting the screwing amount of the spring receiver 57 and the spring constant of the spring 53, 50b is used for opening and closing the valve (when the valve element 54 is in pressure contact with or separate from the valve seat 54a).
That is, the operating pressure is set. In the figure, 71 is an on-off valve 72.
It is a bypass pipe line having a valve, and is opened for flowing water when repairing the pressure reducing valve 10 or the like.

This embodiment is constructed as described above, and the pipe water channel 1
When there is no running water, both pilot valves 50a and 50b are open, the electromagnetic opening / closing valve 61 is closed, and the pressure reducing valve 10 is closed, as shown in FIG. When water is passed from this state, both pilot valves open and the inside of the cylinder 16 communicates with the outflow side. Therefore, the flowing water pressure pushes up the piston 17 while pushing out the water in the cylinder 16 to the outflow side and opens the valve. Then, water flows from the inflow chamber 13 to the outflow chamber 14.

Eventually, the water pressure P _{2 in the} outflow chamber 14 (outflow side)
5 reaches the set pressure of the low pressure side pilot valve 50a,
As shown in FIG. 2, the pilot valve 50a is closed, and at this time, the cylinder 1 is passed through the valve chamber and both pressure guiding tubes 55 and 56.
Since the water pressure P _{3 in} 6 is almost the same as the outflow side water pressure P ₂ , the position of the piston 17 corresponding to the water pressure, that is, the opening degree apart from the valve seat 22 is obtained.

On the other hand, water continues to flow from the water jet hole 30 into the cylinder 16 through the gap with the needle 36 until the pressure in the cylinder 16 becomes equal to the water pressure P ₁ .
At this time, since the pressure receiving area on the cylinder 16 side is set to be larger than the pressure receiving area on the inflow side of the piston 17, when the water pressure P ₃ in the cylinder 16 becomes P ₁ , the piston 16 descends and the flow area of the valve hole 15 is increased. To reduce. When the flow area decreases, the water pressure P ₂ on the outflow side decreases, and when the water pressure P ₂ becomes lower than the set pressure of the low pressure side pilot valve 50a, the valve 50a is opened again and the inside of the cylinder 16 moves to the outflow side. As a result of communication, the piston 17 rises and the flow area of the valve hole 15 (the opening degree at which the piston (valve body) 17 is separated from the valve seat 22) is expanded. By repeating this action, the piston 17 moves up and down within a required width, and the low pressure (small amount of water) within the required width.
Water is sent.

In this low-pressure water supply state, the solenoid opening / closing valve 6
When 1 is opened, the high pressure side pilot valve 50b is
Since the operating pressure is set higher than that on the low pressure side,
The cylinder 16 is communicated with the outflow chamber 14 side. For this reason, the piston 17 rises and shifts to high-pressure (large amount of water) water supply.

As shown in FIG. 6, when the water pressure P ₂ in the outflow chamber (outflow side) 14 reaches the set pressure of the high pressure side pilot valve 50b, the pilot valve 50b is closed and the water pressure in the cylinder 17 at that time is changed. According to the degree of opening. After this,
Similar to the low-pressure side water supply, water is flown into the cylinder 16 through the fountain hole 30, the piston 17 is lowered, and the high-pressure side pilot valve 5
The opening of 0b, the raising of the piston 17, and the closing of the high pressure side pilot valve 50b are repeated, and the piston 17 moves up and down by a required width, and high pressure water supply of the required width is performed.

When the pressure P ₁ of the inflow chamber (inflow side) 13 becomes equal to or higher than a predetermined pressure (excess flow rate) during this high-pressure water supply, the differential pressure of the orifice 2 becomes larger than the permissible value, and the detection signal is detected. And the electromagnetic on-off valve 61 is closed. Then, the low pressure side pilot valve 50a controls the water pressure P ₃ in the cylinder 17, the low pressure water transfer is performed, and inconvenience such as abnormal water sprinkling in the downstream is prevented. When the differential pressure of the orifice 2 returns to within the allowable value, the detection signal is transmitted to the operation panel 4, the electromagnetic opening / closing valve 61 is opened, and high pressure water transfer is started.

This embodiment carries out the above-mentioned actions, and in the watering of the orchard, for example, the following operations (1) to (4) are carried out.

(1) Normal high-pressure water flow (daytime) At 7:00 AM, the timer of the operation panel 4 operates to open the electromagnetic opening / closing valve 61 fully. Due to this opening, the high-pressure side pilot valve 50b operates and a high-pressure water flow state is established. When the electromagnetic opening / closing valve 61 is fully closed after being held for 90 seconds, the low pressure side pilot 50a is activated and the low pressure water flow state is established. After holding for 30 seconds, the electromagnetic opening / closing valve 61 is fully opened to establish a high-pressure water flow state. The above operation is repeated twice to maintain the high-pressure water flow state.

(2) Small-volume low-pressure water flow (nighttime) At PM 7:01, the electromagnetic opening / closing valve 61 is fully closed by the timer operation of the operation panel 4. Due to this closing, the low pressure side pilot valve 50a operates to maintain low pressure water flow.

(3) Low-pressure water flow switching due to excess flow rate At an excess flow rate, the differential pressure before and after the orifice 2 increases. The contact pressure gauge 3 detects a differential pressure equal to or higher than the setting. If this state continues after 90 seconds, the solenoid opening / closing valve 61
Automatically closes and switches to low pressure water flow. The low-pressure water supply state is maintained for 30 minutes.

(4) After 30 minutes from the cancellation of the penalty after excess water flow, the state of occurrence of differential pressure due to excess flow rate is confirmed. If there is a differential pressure, maintain the low-pressure water supply state and reconfirm after 30 minutes. If the pressure difference is equal to or lower than the set differential pressure, the electromagnetic opening / closing valve 61 is fully opened to automatically return to the high-pressure water supply state.

In this embodiment, the electromagnetic opening / closing valve 61
The participation of the two pilot valves 50a, 50b in the control action of the piston 17 was switched, but as shown in FIG. 7, the electric three-way switching valve 61a was used for switching, or as shown by the chain line in FIG.
With the electromagnetic three-way switching valve 61a, both pilot valves 50a, 5
It is possible to switch the communication between 0b and the inside of the cylinder 16 so that the participation of the pilot valves 50a and 50b is switched.

When the degree of pressure reduction is set to 3 or more, a pilot valve (pressure setting valve) according to the number of stages may be attached to the pressure reducing valve 10. For example, in the case of 3 stages,
As shown in FIG. 8, high / medium / low pressure pilot valve 50
a, 50b, 50c are attached. The participation switching is performed by the electric four-way switching valve 62 or the like as shown in the figure.

As shown in FIG. 1, the bypass line 7
If 1 is only for maintenance of the pressure reducing valve 10, the maintenance space in the pipe axis direction can be reduced. Further, if the pilot valves 50a, 50b and the valve 61 are mounted on the pressure reducing valve 10, only the piping of the orifice 2 is required on site. Furthermore, if the on-board equipment is almost targeted to the valve shaft, the unbalanced component force is less likely to act, and piping planning becomes easier.
There is little risk of leakage. Such compactness requires a small carry-in port when installed in the hole.

[0043]

As described above, according to the present invention, a single pressure reducing valve controls a plurality of stages of water supply amount, so that not only the valve itself but also the piping cost is reduced and the cost can be reduced. obtain. Further, since the water supply amount is switched by the electric valve, it is possible to automatically prevent the inconvenient large amount of water supply.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment.

FIG. 2 is a cross-sectional view of the main part of the embodiment.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a perspective view of an essential part of the embodiment.

FIG. 5 is an operation diagram of the embodiment.

FIG. 6 is an operation diagram of the same embodiment.

FIG. 7 is a cross-sectional view of main parts of another embodiment.

FIG. 8 is a cross-sectional view of main parts of another embodiment.

[Explanation of symbols]

1 pipe 2 orifice Differential pressure gauge with 3 contacts 4 Operation panel (control section) 5 solar cells 6 battery 10 Pressure reducing valve 11 Valve box of pressure reducing valve 12 partitions 13 Inflow chamber (inflow side) 14 Outflow chamber (outflow side) 15 valve holes 16 cylinders 17 Piston (valve) 22 valve seat 23 Piston guide 24 saw blade 24a Saw blade gap 30 fountain holes 50a Low pressure side pilot valve (pressure setting valve) 50b High pressure side pilot valve (pressure setting valve) 51 Pilot valve valve box 53 Pressure setting spring 55, 56 communication passage 57 Pressure setting spring receiver 61 solenoid valve 61a Electric three-way valve 62 electric four-way valve

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akio Akito             551 Mutsuya, Wakayama City Meiwa Co., Ltd.             Inside the factory F-term (reference) 3H056 AA01 BB07 BB32 CA02 CB02                       CB08 CC02 CC05 CC07 CD01                       DD03 EE06 GG05                 5H316 AA07 AA20 BB08 DD07 DD17                       EE02 EE10 EE12 FF22 HH04                       HH15 JJ01 JJ14 JJ15 KK02

Claims (4)

[Claims] 1. A pressure reducing valve 10 is provided in the pipe water channel 1 to reduce the pressure.
The secondary pressure on the outflow side is reduced to multiple stages by the pressure valve 10.
In a reduced pressure water supply device that sends water by The pressure reducing valve 10 includes an inflow chamber formed by a partition wall 12 in a valve box 11.
13 and the outflow chamber 14, and the partition 12 is provided with a valve hole 15
And a cylinder 16 is provided in the outflow chamber 14.
A piston 17 having a valve body in its cylinder 16
Is installed so as to be movable in the cylinder axis direction, and the piston 1
7 moves the valve body into contact with the valve seat 22 of the valve hole 15.
It is opened and closed separately, Further, in the pressure reducing valve 10, the pressure setting of the number of the pressure reducing stages is set.
A valve is attached to each pressure setting valve.
The pressure P on the outflow side is connected to the inside of the binder 16 ₂Is self
Cylinder 16 when less than the respective set value of
The inside of the cylinder 16 is communicated with the inside by communicating the inside with the outflow side.
Adjust the pressure in the cylinder 16 to be closed,
Determine the position of the piston 17 according to
Adjust the gap and adjust the gap to adjust the secondary pressure.
To reduce the pressure in multiple stages, In addition, the communication passage 5 from the inside of the cylinder 16 to each pressure setting valve
6 or the electric switching valves 61, 6 in the communication passage 55 from the outflow side.
1a and 62 are provided, and by the command from the control unit 4,
Select each pressure setting valve by switching valve in cylinder 16
It is characterized by having participated in the pressure regulation of
Pressure water supply device. 2. The lower end of the piston 17 of the pressure reducing valve 10 is shaped so as to project downward in a saw blade shape over the entire circumference thereof, and the saw blade portion 24 is slidably fitted in the valve hole 15. The reduced pressure water supply device according to claim 1, wherein when the valve body and the valve seat 22 have a very small gap, the water flows from the gap of the saw blade portion 24 when the valve is opened. 3. The pressure setting valve 50a, 50b according to claim 1 or 2, wherein two types of pressure setting valve 50a, 50b are set.
A communication passage 55 from the outflow side to the high pressure setting valve 50b.
The electromagnetic opening / closing valve 61 serving as the electric switching valve is installed in the
When the electromagnetic on-off valve 61 is closed, the outflow side communicates only with the low pressure setting valve 50a, and when the electromagnetic on-off valve 61 is opened, the outflow side communicates with the high pressure setting valve 50b. 4. A flowmeter 2 is provided in the inflow side pipe water channel 1, and if the detected flow rate exceeds a required value, the cylinder 1 is now
It is characterized in that the pressure setting valve participating in the pressure adjustment in 6 is switched to the pressure setting valve on the lower pressure side than the set pressure so that the low pressure side pressure setting valve participates in the pressure adjustment in the cylinder. The reduced pressure water supply device according to any one of claims 1 to 3.