JPS6226046B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention makes it possible to automatically control water supply pressure according to the amount of water used, and also to automatically control water supply pressure in the event of an emergency such as when a water pipe ruptures due to an earthquake or ground collapse. This invention relates to an automatic pressure regulating valve with an emergency shutoff system, which is capable of shutting off water supply.

In water supply facilities, water usage is generally high during the day and low at night, so it is not possible to supply water at the same water pressure during times when water usage is low and during times when water usage is high. This causes various problems. An example of this is water leakage.

The main cause of water leakage is that when the amount of water used decreases, the water pressure on the water supply side is high, causing damage to water pipes, service pipes, and other accessories. Therefore,
As a countermeasure to this problem, it is considered necessary to automatically adjust the water pressure on the water supply side according to the amount of water used.

Furthermore, if a water pipe ruptures due to a ground subsidence or an earthquake, a large amount of water will be wasted if left untreated, so it is necessary to shut off the water supply in such an emergency.

Therefore, in order to automatically adjust the water pressure on the water supply side as described above or to automatically shut off the water supply in an emergency, it is assumed that electrical operation will be used, but this requires a complicated mechanism. As well as becoming expensive,
It will not operate in the event of a power outage or electrical equipment failure.

This invention was made to solve the above-mentioned problems.
A plurality of pilot valves with different set pressure values are provided, and the pilot valves are switched according to the amount of water used to prevent the water pressure from rising excessively even when the amount of water used decreases. An object of the present invention is to provide an automatic regulating valve with an emergency shutoff system, which can prevent water leakage in the system and automatically shut off the water supply in an emergency.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an automatic regulating valve with an emergency shutoff system according to the present invention will be described based on the drawings.

FIG. 1 is an explanatory diagram of the overall schematic configuration of one embodiment. In this FIG. 1, numeral 1 indicates a water supply pipe 2, a water outlet pipe. One end of water supply pipe 1 (right side in Figure 1)
is connected to a water source (not shown), and the left end side of the water outlet pipe 2 is connected to a water pipe on the consumer side. A valve box 3 is installed between the water supply pipe 1 and the water outlet pipe 2.
The valve box 3 is used to control the pressure of water supplied from the water supply pipe 1 to the water outlet pipe 2 in accordance with the amount of water used by the consumer.

A cylinder 3b is provided at the top of the valve box 3, into which a piston 3c provided at the top of the main valve 3a is inserted.
The pressure receiving area c is larger than the pressure receiving area of the lower surface of the main valve 3a. In the cylinder 3b, an inflow means and an outflow means as described later are provided.
Water enters and exits from the water supply side, and the opening and closing of the main valve 3a is controlled by the difference between the water pressure applied to the piston 3c and the water pressure applied to the lower surface of the main valve 3a.

As means for inflowing water into the cylinder 3b,
For example, as shown in the figure, water is introduced from a valve box 3 near the water supply pipe 1 into the cylinder 3b through a communication pipe 4 that communicates with the interior of the cylinder 3b. And the communication pipe 4
A strainer 5 and a needle valve 6 are attached to predetermined locations.

On the other hand, near the connection point between the water supply pipe 1 and the valve box 3, an orifice plate 7 provided with an orifice 7a is attached. One end of each of communication pipes 8 and 9 is connected to the upstream and downstream sides of the orifice plate 7, respectively. The other end of the communication pipe 8 is connected to the upper chamber of the diaphragm 10a of the switching pilot valve 10, and the other end of the communication pipe 9 is connected to the upper chamber of the diaphragm 10a of the switching pilot valve 10.
It is connected to the lower chamber of 0a.

The switching pilot valve 10 has a diaphragm 10a.
and a valve portion 10b, of which the diaphragm 10a is balanced by the elasticity of the spring 10c and the pressure of water flowing into the upper and lower chambers. That is, the switching pilot valve 10 controls the water pressure on the upstream side of the orifice plate 7.
Detect the pressure difference between P ₁ and the downstream water pressure P ₂ .
When this pressure difference is below a predetermined value, diaphragm 1
Due to the water pressure in the lower chamber of 0a, the diaphragm 10
a and spring 10c are in balance, and when the pressure difference becomes larger than a predetermined value, spring 1
The diaphragm 10c is pushed down by the elastic force 0c and the water pressure in the upper chamber. In addition, according to the vertical movement of this diaphragm 10a,
A valve body (not shown) connected to this via a valve stem
is now open and closed. When the diaphragm 10a is pushed down more than a predetermined amount, that is, when the pressure difference becomes more than a predetermined value, the valve portion 10b
The valve body 10b is open, and the valve portion 10b is closed at other times.

The primary side of this valve portion 10b and the cylinder 3 of the valve box 3
A communication pipe 11 is connected between b, and
The secondary side of the valve portion 10b is connected via a communication pipe 12 to the primary side of a valve portion 13b of a high pressure reducing pilot valve 13, which will be described later. Therefore, the valve portion 10b
When the valve body is open, the communication pipe 11 and the valve part 1
0b and the cylinder 3 of the valve box 3 through the communication pipe 12.
The water in b can flow out in the direction of the high pressure reducing pilot valve 13.

In addition, 13 is a high-pressure reducing pilot valve that detects the water pressure in the water outlet pipe 2 and responds accordingly.
The lower chamber communicates with the valve box 3 near the water outlet pipe 2 via the communication pipe 14. As a result, the communication pipe 14
Water flows into the lower chamber through the lower chamber according to the water pressure in the water outlet pipe 2, and the diaphragm 13a is balanced by the water pressure in the lower chamber and the elasticity of the spring 13c. The diaphragm 13a operates in response to the pressure of water from the water outlet pipe 2 when the amount of water used increases.
The elasticity of the spring 13c is adjusted and set in advance. In this way, the opening degree of the valve body of the valve portion 13b is adjusted by the fluctuation of the diaphragm 13a. Further, the secondary side of the valve portion 13b is connected via a communication pipe 15 to the primary side of a valve portion 16b of an emergency shutoff pilot valve 16, which will be described later.

Next, reference numeral 17 indicates a low-pressure reducing pilot valve, which has the same structure as the above-mentioned high-pressure reducing pilot valve 13, and the primary side of the valve portion 17b is connected to the valve via a needle valve 19 and a communicating pipe 18. It communicates with the cylinder 3b of the box 3, and the secondary side of the valve portion 17b is connected to the primary side of the valve portion 16b of the emergency shutoff pilot valve 16, similar to the valve 13 described above. Further, the lower chamber of the diaphragm 17a is also communicated with the valve box 3 near the water outlet pipe 2 via the communication pipe 14, similarly to the valve 13 described above. Therefore, by adjusting the elasticity of the spring 17C, this low-pressure reducing pilot valve 17 operates in response to the pressure from the water pipe 2 when the amount of water used is less than the switching setting flow rate. The pressure value is set to be lower than that of the pilot valve 13.

As described above, install the high pressure reducing pilot valve 1.
When the valve body 3 and the valve body of the switching pilot valve 10 are open, the water in the cylinder 3b of the valve box 3 flows through the communication pipe 11, the valve part 10b, the communication pipe 12, and the valve part 13.
b. It is discharged through the communication pipe 15 toward the valve part 16 of the emergency shutoff pilot valve 16.
Further, when the valve body of the switching pilot valve 10 is closed, the water in the cylinder 3b flows through the communication pipe 11, the communication pipe 18, the needle valve 19, and the valve portion 17.
b. The water flows through the communication pipe 20 and the communication pipe 15, and then through a drainage channel leading to the valve portion 16b of the emergency shutoff pilot valve 16. In this way,
As the water in the cylinder 3b of the valve box 3 is discharged, the water pressure in the cylinder 3b is adjusted to decrease, and the opening degree of the main valve 3a is controlled accordingly.

The emergency shutoff pilot valve 16 is provided with an upper chamber and a lower chamber on both the upper and lower sides of the diaphragm 16a. It is connected to pipe 9. Therefore, the upper chamber is connected to the communication pipe 8,
Water according to the water pressure on the upstream side of the orifice plate 7 flows into the lower chamber through the communication pipes 9 and 22, and water according to the water pressure on the downstream side of the orifice plate 7 flows into the lower chamber through the communication pipes 9 and 22. The diaphragm 16a is balanced by the water pressure in the upper and lower chambers and the elasticity of the spring 16c. That is, the emergency shutoff pilot valve 16 is configured to detect the water pressure on the upstream side and the water pressure on the downstream side of the orifice plate 7 in parallel with the switching pilot valve 10.

Valve portion 16b of this emergency shutoff pilot valve 16
is connected to the communication pipe 15 as described above, and is also connected to the valve box 3 near the water outlet pipe 2 through the communication pipe 23, and the pressure difference between the upstream side and the downstream side of the orifice plate 7 becomes large. Switching pilot valve 1
The valve portion 16b is designed not to close unless a pressure difference much larger than that when the valve body is opened is generated. That is, when the amount of use increases or decreases during normal times, the valve portion 16b is open, and the water in the cylinder 3b of the valve box can be discharged through the valve bodies of the pilot valves 10, 13, and 17. However, due to a water pipe bursting, etc., a large amount of water flows out, and the water pressure P ₂ on the downstream side of the orifice plate 7 decreases.
When the water pressure _P1 on the upstream side becomes significantly smaller than the water pressure P1 on the upstream side, the valve body of the valve portion 16b closes.

The emergency shutoff pilot valve is provided with a locking device that, once the valve body is closed, keeps the valve body closed unless it is manually reset.

FIG. 2 is a cross-sectional view of the structure of this locking device. In this figure 2, 16
d is a case that houses the spring 16c,
A block 16e is integrally formed on the upper surface of the case 16d. Block 16
There is a connecting rod 16 at the center of the upper surface of the case 16d and the case 16d.
f is penetrated so that it can move up and down, and this connecting rod 1
The lower end of 6f is connected to the upper surface of a support plate (not shown) within case 16d. The upper end of the spring 16c is fixed to the lower surface of the support plate.

The upper end of the connecting rod 16f passes through the case 16d and the block 16e, and a locking step portion 16g with a reduced diameter is formed at a portion lower than the upper end of the connecting rod 16f by a predetermined dimension. Further, a cylinder 16h is formed in the block 16e and communicates with the connecting rod 16f in a direction perpendicular to the connecting rod 16f.
The cylinder 16h has a large diameter part and a small diameter part,
A piston 16i is inserted into the small diameter portion,
At one end of the piston 16i (on the right side in Figure 2) there is a tsuba 1.
6j is provided, and this collar 16j is connected to the cylinder 16h.
Located within. A rod 16k is connected to the center of the cylinder 16h, and the rod 16k projects from the block 16e. A handle 16l is attached to the end of the rod 16k. Inside the large diameter portion of the cylinder 16h is a coil spring 16m. is stored. The large-diameter portion of the cylinder 12h near the right end in the figure is formed to have an even larger diameter, and a threaded groove is cut into the inner circumferential surface of the cylinder 12h, and a nut 16n is screwed into the threaded groove. And Natsuto 16n and Tsuba 16j
A coil spring 16m is interposed between the coil springs 16m and 16m, so that the piston 16i is always moved by the outer peripheral surface of the large diameter part of the connecting rod 16f against the elasticity of the coil spring 16m. It is located within the small diameter section. The rod 16k is inserted into the center of the nut 16n.

Next, the operation of the automatic pressure regulating valve with an emergency shutoff system of the present invention constructed as described above will be explained.

First, in the normal water supply state, the emergency shutoff pilot valve 16 is opened and in the drain state to the extent that the amount of water used fluctuates. Water supplied from the water supply pipe 1 at a predetermined pressure is supplied to the consumer side through the valve box 3 and the water outlet pipe 2. In this state, water is flowing into the cylinder of the valve box 3 from the vicinity of the water supply pipe 1 through the communication pipe 4, and the opening degree of the valve body 3a is adjusted by the pressure of this water, and a predetermined amount is applied to the customer side. Water is supplied at the same water pressure.

In this normal state, when the amount of water used is large, the pressure P ₂ on the downstream side of the orifice plate 7 is lower than the pressure P ₁ on the upstream side. Along with this, the communication pipe 9
The pressure of the water flowing into the lower chamber of the diaphragm 10a through the communication pipe 8 flows through the diaphragm 10a.
The pressure of the water flowing into the upper chamber of the diaphragm 10a becomes smaller than that of the water flowing into the upper chamber of the diaphragm 10a. When the above-mentioned pressure difference becomes larger than a predetermined value, the valve element of the valve part 10b connected to the diaphragm 10a opens, and thereby the water in the cylinder 3b of the valve box 3 is drained from the communication pipe 11 to the valve part. 10b, the water flows through the communication pipe 12 toward the valve portion 13b of the high-pressure reducing pilot valve 13.

In this way, when the amount of water used is greater than the switching setting flow rate, the valve body of the high pressure reducing pilot valve 13 whose pressure value has been set to match it is opened, and one of the low pressure reducing pilot valves 17 is opened.
The valve body is in a closed state. As a result, the valve part 13b of the high-pressure reducing pilot valve 13 and the valve part 10b of the switching pilot valve 10 communicate with each other, and the valve body 3
The water in the cylinder 3b flows from the valve portion 13 to the communication pipe 15, and is discharged from the valve portion 16b of the emergency shutoff pilot valve 16, whose valve body is normally open, to the water outlet pipe 2 through the communication pipe 23. Ru.

As a result, the pressure inside the cylinder 3b decreases, and the valve body 3a is pushed up by the water pressure from the water supply pipe 1 to widen its opening, thereby increasing the amount of water supplied. In this case, the opening degree of the valve body of the high-pressure reducing pilot valve 13 is adjusted according to the water pressure in the water outlet pipe 2, which increases or decreases depending on the amount of water used by the consumer at that time. By adjusting the opening degree, the amount of water discharged from the cylinder 3b arranged in the valve box 3 is controlled, and the opening degree of the main valve 3a is adjusted by the pressure generated by controlling the amount of water discharged. I take it as a thing.

Additionally, when the amount of water used decreases below the switching set flow rate and the water pressure in the water outlet pipe 2 increases, the pressure difference between the upstream side and the downstream side of the orifice 7 decreases accordingly, but when this pressure difference falls below a predetermined value. Then, the diaphragm 10a of the switching pilot valve 10 operates to close its valve body, and the cylinder 3, which had been drained from the communication pipe 11 through the valve part 10b,
The water in b will be prevented from draining. However, in this case, the low pressure reducing pilot valve 1
Since the valve element 7 is opened by the diaphragm 17a pushed up by the water pressure in the water outlet pipe 2, the water from the cylinder 3b passes through the valve part 17b from the communication pipes 11 and 18. Communication pipe 2
By ensuring the discharge amount in the cylinder 3b, the main valve 3a is adjusted so as not to descend and block the flow path of the valve box 3. In this case as well, since the valve body of the emergency cutoff pilot valve 16 is normally open, water will be discharged from this valve portion 16b into the water outlet pipe 2 through the communication pipe 23. The pressure value of the low-pressure reducing pilot valve 17 is set to suit a situation where the amount of water used is less than the switching setting flow rate, so the valve body can increase or decrease the water pressure in the water outlet pipe 1 within a small opening range. The opening degree will be adjusted accordingly. Therefore, the outflow of water from the cylinder 3b is suppressed, the pressure inside the cylinder 3b increases, and the main valve 3a is controlled in the direction of closing. The opening degree of the main valve 3a is throttled and adjusted by the water pressure in the water outlet pipe 2, which increases or decreases depending on the amount of water used by the user.
By adjusting the opening degree of the valve body b, the outflow of water from the cylinder 3b is adjusted, and the opening degree of the main valve 3a is controlled near its throttled state, thereby increasing the water supply pressure. It will be adjusted by a low pressure reducing pilot valve according to the amount of water used by the consumer.

Next, the operation of the emergency shutoff pilot valve 16, which is one of the features of the present invention, will be explained. Now, due to an earthquake or a road collapse accident,
If a water pipe ruptures and a large amount of water flows out, the pressure difference between the upstream and downstream sides of the orifice plate 7 will be much larger than the pressure difference that would normally occur due to an increase in the amount of water used. This will result in a large pressure difference. As a result, the emergency shutoff pilot valve 1
The diaphragm 16a of No. 6 operates to close the valve body of the valve portion 16b. Therefore, the water from the high-pressure and low-pressure reducing pilot valves 13 and 17 is shut off at the emergency shutoff pilot valve 16, and the discharge of water in the cylinder 3b of the valve box 3 is stopped. The pressure will rise and push down the main valve 3a, completely closing it. Thereby, the connection between the water supply pipe 1 and the water outlet pipe 2 is cut off, and the water supply to the water outlet pipe 2 is stopped.

Then, as the valve body of the emergency shutoff pilot valve 16 operates in the closing direction, the locking stepped portion 16g of the connecting rod 16f lowers to the position of the piston 16i, as shown in FIG. Due to the elasticity of the spring 16m, the spring 16m projects to the locking step 16g, thereby preventing the connecting rod 16f from moving up and down. That is, the valve body of the valve portion 16b is maintained in a closed state. Therefore,
The water supply to the water outlet pipe 2 will be stopped until the accident is recovered and the handle 16l is not manually operated.

As described in detail above, according to the present invention, a valve box is connected between a water supply pipe and a water outlet pipe, and the amount of water used is greater than the switching set flow rate, so that the upstream side of the orifice and the downstream side are connected. When the pressure difference exceeds a predetermined value, the switching pilot valve is opened and the water in the cylinder 3b of the valve box 3 is directed to the high pressure reducing pilot valve, depending on the pressure in the water outlet pipe when the amount of water used is large. Water is drained through this high-pressure reducing pilot valve that operates, and this adjusts the pressure in the cylinder of the valve box according to the increase or decrease in water usage when the water usage is high, and the main valve The opening degree is automatically controlled to provide the necessary water supply pressure during high-pressure water supply, and if the amount of water used becomes less than the switching set flow rate and the pressure difference above falls below the specified value, The switching pilot valve closes and drains the water in the cylinder of the valve body through the low pressure reducing pilot valve, which operates in response to the pressure in the outlet pipe during low water use conditions, thereby , the pressure inside the valve box cylinder is adjusted according to the increase or decrease in the amount of water used when the amount of water used is low, and the opening degree of the main valve is automatically controlled. Can be restrained by water pressure. Therefore, when a large amount of water is used, high-pressure water supply suitable for the water supply can be performed, and excessive water pressure can be suppressed when the amount of water used is small, preventing damage to water supply facilities due to excessive water pressure, and preventing water leakage. It is also useful for prevention.

In addition, an emergency shutoff pilot valve is provided that operates only when the pressure on the downstream side of the orifice plate becomes significantly lower than the pressure on the upstream side. Since the water is drained through the pilot valve, in the event that a water pipe ruptures due to an earthquake or cave-in accident and a large amount of water spouts out, the emergency shutoff pilot valve will operate and drain water from the cylinder of the valve box. It is possible to stop the drainage of water, increase the pressure inside the cylinder, and close the valve body in the valve box, thereby automatically shutting off the water supply without requiring any human intervention.

Furthermore, since no electrical equipment is used, even in the event of an emergency power outage, there is no risk of the device becoming inoperable, and therefore maintenance and inspection is easy and the configuration is simple. It can be manufactured at low cost and has many excellent effects such as excellent durability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of an automatic pressure regulating valve with an emergency shutoff system according to the present invention, and FIG. 2 is a sectional view showing the configuration of a locking device portion of the emergency shutoff pilot valve according to the present invention. It is. 1... Water supply pipe, 2... Outlet pipe, 3... Valve box, 3
a...Main valve, 3b...Cylinder, 3c...Piston, 10...Switching pilot valve, 13...High pressure pressure reducing pilot valve, 16...Emergency shutoff pilot valve, 17...Low pressure reducing pilot valve, 16f
...Connection rod, 16g...Lock step, 16i...Piston.

Claims (1)

[Claims] 1. Each pilot valve for high pressure reduction and low pressure reduction communicates with a cylinder in which the main valve disposed in the valve box is movable, and controls the operation of the main valve in response to the outlet side pressure of the main valve; An emergency shutoff pilot valve is provided in communication with the outlet side of the main valve to stop drainage from the cylinder and close the main valve by blocking water flow from each of the pilot valves. An automatic pressure regulating valve with an emergency shutoff system.