JPH09317916A - Automatic adjusting valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform self-scavenging operation and eliminate clogging of sand grains and dusts by providing first and second pilot valves which are opened and closed correspondingly to intensity of pressure on a downstream side of a main valve on an automatic adjusting valve device arranged on a fluid transferring pipe passage, and controlling the valves by means of a differential pressure cylinder device. SOLUTION: A pilot A valve part is so arranged that a main valve body 5 assembled inside a main valve box 1 is closed when pressure on a downstream side of a main valve is a specified value by means of a main valve driving part 6 having a pressure receiving area larger than that of the main valve body 5, and it is opened when the pressure is lower the specified value. A pilot B valve part is so arranged that the valve body 5 is opened when the pressure on the downstream side of the main valve is a specified value or higher. The valve parts are serially communicated with a portion between an inlet flow passage and an outlet flow passage through a main valve driving pressure chamber therebetween. The valve parts are driven and controlled by a differential pressure cylinder device which is operated by differential pressure across an orifice 12 and balance of opposed functional force in respect to a specified additional external force means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic adjusting valve device provided with an automatic throttle adjusting flow passage installed in a fluid transportation pipeline, and more specifically, Japanese Patent Application No. 8-26828 "Automatic Constant Pressure Valve". Apparatus ”(hereinafter referred to as“ original invention ”). In other words, as an automatic constant pressure valve device that is convenient for water supply and distribution, there is no need for management, and it is possible to easily increase the size and increase the pressure without worrying about water tightness when water is stopped.
Also, a function to eliminate all fixed throttle control flow paths such as needle valves and cocks from the pilot valve device section, and automatically open each valve element when the valve section is clogged to perform self-cleaning flow In addition to having the function of an automatic constant pressure valve, it also has the function of automatically limiting the flow rate so that the supply flow rate to the downstream side does not exceed a specified amount The device is to be obtained. In addition, in this specification, the language of "water" generically represents a fluid.

[0002]

2. Description of the Related Art As a conventional general pressure regulating valve device, a fluid pressure in an outlet pipe line system thereof is detected, for example,
A structure in which a piston for driving a main valve is operated by a pilot valve device that is operated while restricting a flow rate by a fixed throttle control flow path such as a needle valve has been widely used. However, in these conventional general pressure regulating valve devices, there are many concerns regarding maintenance and cumbersomeness and durability, and for example, there are the following difficult problems. (1) Most of the pistons for driving the main valve require a perfect watertight structure that does not allow water leakage at the time of shutoff. Especially as the size and pressure increase, the durability and processing accuracy of the seal part become more difficult. It is also troublesome in terms of maintenance. (2) In order to prevent pressure pulsation (hunting) due to a sudden flow change, in order to slowly drive the main valve, a communication passage for introducing a fluid at a pressure upstream of the main valve into a piston for driving the main valve is used. A fixed throttle channel such as a needle valve is required on the way, and clogging of sand grains, dust and the like is likely to occur in the fixed fine channel. (3) Further, the adjustment for setting the required pressure on the downstream side of the main valve is performed while checking the balance between the fixed throttle passage such as the needle valve and the pilot valve device, which is necessary for operation and maintenance management. Take the hand.

By solving these problems and by using a pilot valve device such as a needle valve which does not have a fixed throttle channel, there is no clogging accident, and there is no water leakage when the main valve device is shut off. We proposed a pressure regulating valve device with a clear mechanism that can maintain the pressure on the downstream side at a predetermined value.
It is Japanese Patent Application No. 8-26828 “Automatic constant pressure valve device” of the original invention. The structure is as described in the specification of the patent application, and the gist thereof is that the main valve device (illustrated in FIG. 3) is integrally incorporated in the main valve box 1 and the main valve body 5 and the main valve drive member 6 are provided. The main valve body 5 is located on the upstream side of the main valve seat 3 and forms a main valve opening b between them, and the main valve drive member 6 is provided with respect to the cylindrical inner wall portion 8 of the main valve box 1. It is configured to be slidably fitted to form a main valve drive pressure chamber d between the main valve box cover 2 and the main valve box cover 2, and the pilot valve device includes a downstream pressure of the main valve device and one predetermined additional external force means. It consists of a coaxial pilot A valve part and B valve part that operate by the balance of the acting force of and, and both maintain a substantially closed state when the pressure on the downstream side of the main valve is at a predetermined value.
A pilot A valve portion that opens when the main valve downstream side pressure becomes lower than a predetermined value and a pilot B valve portion that opens when the main valve downstream side pressure becomes higher than a predetermined value are connected via a main valve drive pressure chamber d. By connecting the inlet passage a and the outlet passage c in series, a main valve driving pilot valve device having no fixed throttle passage is constructed. In addition, the variable outlet 12 may be provided in the outlet passage of the main valve device.

[0004]

This original invention, when viewed as a constant pressure valve itself, achieves its purpose well and is utilized as a simple and high-performance constant pressure valve. However, in actual use conditions In light of this, there are still challenges. This is because in actual use, it is often requested to function as a constant pressure valve during normal use, but to function as a constant flow valve that limits the flow rate when the downstream side usage flow rate becomes excessive. ,
In that case, the automatic constant pressure valve device according to the original invention cannot be used alone. This is because, in this device, when the flow rate used on the downstream side becomes excessive and a pressure drop occurs on the downstream side, the main valve is designed to increase the flow rate by the original function of the constant pressure valve to compensate for the pressure drop. This is because the device operates. The original invention states that a constant flow rate can be achieved by providing a variable orifice 12 in the outlet flow path of the main valve device. However, this is when the opening / closing valve or flow rate adjusting valve does not exist on the side of the end of use of the pipeline. It is a theory that holds, and in reality, it is usual to open and close the flow path and adjust the flow rate at the water use point of the pipeline terminal. In that case, the constant flow rate cannot be maintained simply by providing the orifice 12. Of course. It is considered difficult to coexist the function as a constant pressure valve and the function as a constant flow rate valve with a simple structure. Conventionally, the constant pressure valve and the constant flow rate valve are arranged in two or downstream. Usually, an expensive sensor or switching device for switching the functions of the constant pressure valve and the constant flow valve according to the flow rate used on the side was provided.

The present invention solves the problems left behind in the original invention as described above, and there is no water leakage when the main valve device is shut off, and there is no fixed throttle passage such as a needle valve. In addition, there is no self-cleaning operation in each valve section, and maintenance work is not involved, and while maintaining all the advantages of the original invention, both functions of the constant pressure valve and the constant flow valve are compatible with each other. The purpose is to obtain a convenient automatic regulating valve device.

[0006]

In order to achieve the above object, in the self-regulating valve device of the present invention, the main valve device is linked to the pilot valve device which operates by the pressure change of the fluid flowing through it. In the driven automatic adjustment valve device,
The main valve device has a main valve body integrally incorporated in the main valve box and a main valve drive member having a larger pressure receiving area than the main valve body, and the main valve body is on the upstream side of the main valve seat. The main valve drive member is slidably fitted to the cylindrical inner wall portion of the main valve box, and forms a throttle channel between the main valve seat and the main valve seat. The pilot valve device forms a main valve drive pressure chamber, and the pilot valve device is actuated by the balance of the opposing acting force between the downstream pressure of the main valve device and the predetermined additional external force means, and the pilot A valve part and the pilot B valve part are coaxial. And a pilot A valve portion that maintains a substantially closed state when the main valve downstream side pressure is at a predetermined value and opens when the main valve downstream side pressure becomes lower than a predetermined value, and a main valve downstream side When the pressure becomes higher than a predetermined value, the pilot B valve section, which is opened, is provided in the middle with the main valve drive pressure chamber, Of the opposing acting force of the differential pressure across the orifice and the predetermined additional external force means, which are connected in series between the inlet passage and the outlet passage of the valve device, and are provided in the passage of the main valve device. A differential pressure cylinder device operating by balance is attached to the pilot valve device, and if the differential pressure across the orifice becomes higher than a predetermined value, both pilot A and B valve parts are connected to a predetermined additional external force means of the pilot valve device. It is characterized in that it is configured to push in the direction opposite to the force of. Also, the orifice may be a variable orifice.

[0007]

In the automatic regulating valve device according to the present invention, when the main valve downstream side pressure is at a predetermined value due to the main valve downstream side pressure which changes due to the amount of the used flow rate on the downstream side during water passage and the like. Both are kept in a substantially closed state, and the pilot A valve section opens when the main valve downstream side pressure becomes lower than a predetermined value, and the pilot B valve which opens when the main valve downstream side pressure becomes higher than the predetermined value.
The valve portion performs a linked operation to appropriately increase or decrease the internal pressure of the main valve drive pressure chamber to maintain a predetermined main valve downstream pressure while adjusting the opening degree of the main valve body. While operating as a constant pressure valve, if the downstream flow rate does not exceed the specified amount, the piston shaft of the differential pressure cylinder device is separated from the valve shaft of the pilot valve device, and the pilot valve It does not interfere with the operation of the device as a constant pressure valve. On the other hand, if the flow rate used on the downstream side becomes excessive and it is about to exceed the prescribed amount, the piston pressure of the differential pressure cylinder device will increase due to the expansion of the differential pressure across the attached orifice. It comes into contact with the shaft and pushes it in the direction opposite to the force of the predetermined external force means of the pilot valve device, causing the main valve body to close by interfering with the operation as a constant pressure valve, interfering with the flow rate by a predetermined amount. To maintain.

When the use of the downstream side is finished and the closing operation of the terminal pipeline is started, the pilot A valve portion is closed and the B valve portion is opened due to the increase in the pressure on the downstream side of the main valve accompanying the closing operation.
Thereby, the main valve body is closed to maintain the main valve downstream side pressure at a predetermined value. At this time, the differential pressure across the attached orifice is reduced due to the decrease in the flow rate due to the closing operation of the terminal pipe line, so the piston shaft of the differential pressure cylinder device returns to the state separated from the valve shaft of the pilot valve device. It does not interfere with the operation as a constant pressure valve.

According to the structure of the present invention, even if the seal member of the main valve drive member is left to be rough and watertight,
No abnormal increase in pressure on the downstream side of the main valve occurs. In addition, when the main valve device, the pilot A valve section, and the B valve section are clogged with sand grains, dust, etc., the valve is automatically changed by the change in the pressure on the downstream side of the main valve caused by the clogging. It also has the function of opening the valve and eliminating clogging by self-cleaning flow.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described with reference to FIG. 1 showing an embodiment. In the following, for convenience, the pilot A valve portion is “A valve portion”, the valve body is “A valve body”,
The pilot B valve portion is referred to as "B valve portion", the valve element thereof is referred to as "B valve element", the main valve upstream side pressure is referred to as "primary pressure", and the main valve downstream side pressure is referred to as "secondary pressure". First, in the diagram of the main valve device in FIG. 1, 1 indicates a main valve box provided with an inlet channel a and an outlet channel c2, and 2 indicates a main valve box lid. 3 is a main valve seat. In the main valve box 1, a main valve body 5 provided upstream of the main valve seat 3 and a cylindrical inner wall portion 8 of the main valve box 1 are slidably fitted via a seal member 6s. A main valve drive member 6 mounted and a main valve shaft 4 integrally combining both members 5; 6 are provided. Then, the main valve drive pressure chamber d is enclosed in the main valve drive member 6, the cylindrical inner wall portion 8 and the main valve box cover 2 and has a bag-chamber shape.
Is formed, and the main valve body 5 is opened and closed by increasing and decreasing the internal pressure. Regarding the relationship of the pressure receiving area between the main valve body 5 and the main valve drive member 6, the main valve drive member 6 is set to be larger.
Even when the main valve is closed, the seal member 5 of the main valve body 5 is closed.
s and the seal member 24s of the A valve body 24 of the pilot valve device
Since they have a strict water-tight function, the seal member 6s of the main valve drive member 6 is sufficient to have a rough water-tightness to the extent that it prevents escape.

In the drawing of the pilot valve device, 21 is a valve box forming the A valve section, B valve section and secondary pressure chamber i, and 22 is a valve box lid. Reference numeral 23 is a pressure receiving plate, 28 is a sealing member, and 26 is a valve shaft that integrally combines the A valve body 24 and the B valve body 25 with the pressure receiving plate 23. A spring 27 as a predetermined additional external force means is housed in the spring chamber j of the valve box cover 22. An A valve chamber e, an A valve body 24, and an A valve seat chamber f are arranged in the A valve portion. Since the A valve body 24 exhibits strict water tightness when closed, the seal member 24
s is shown. In the B valve portion, the B valve chamber g (A
The same as the valve chamber e), the B valve body 25, and the B valve seat chamber h are provided. It is shown that the B valve body 25 does not need to be strictly watertight when closed and may be slightly leaked. (Of course, strict water tightness may be added to the B valve body 25 as well.) The A valve portion and the B valve portion are not limited to the state in which one is opened and the other is closed at the time of operation. The valve portions are arranged at position intervals that can also create a state in which both valve portions are substantially closed.

In the diagram of the differential pressure cylinder device, 31
Indicates the cylinder body, and 32 indicates the cylinder lid. Reference numeral 33 indicates a piston, and 34 indicates a piston shaft fixed to the piston 33. The pressure receiving area of the piston 33 is set larger than the pressure receiving area of the pressure receiving plate 23 of the pilot valve device. Further, the piston shaft 34 is urged in a direction away from the pilot valve shaft 26 by a spring 35 as a predetermined additional external force means. And sandwiching the piston 33,
An orifice front pressure chamber u is formed on the side far from the pilot valve shaft 26, and an orifice rear pressure chamber w is formed on the side close to the pilot valve shaft 26. Note that the piston 33 does not need to be strictly watertight with the inner wall of the cylinder 31, and may be slightly leaking. (Of course, strict water tightness may be added to the piston 33.)

The A valve seat chamber f of the pilot valve device has a communication passage P.
To the inlet passage a of the primary pressure by the A valve chamber e (B
The valve chamber g) is in communication with the main valve drive pressure chamber d through the communication passage Pe, and the B valve seat chamber h is in communication with the outlet passage c2 of the secondary pressure through the communication passage Q2. Further, the secondary pressure chamber i is communicated with the outlet passage c2 of the secondary pressure via the communication passage Q2. The orifice front pressure chamber u of the differential pressure cylinder device is communicated with the flow path c1 on the front surface (inlet side) of the orifice 12 by the communication passage Q1, and the orifice rear surface pressure chamber w is connected by the communication passage Q2 to the rear surface (outlet side) of the orifice 12. ) Is connected to the flow path c2.

The mode of operation of the present invention will be described with reference to FIG. 1 showing an embodiment. When the fluid shown in FIG. 1 is inserted into the fluid transport pipe to pass water, the outlet passage c2 does not reach a predetermined pressure yet, and the force of the spring 27 of the pilot valve device causes the secondary pressure in the secondary pressure chamber i. Since the A valve body 24 is open and the B valve body 25 is closed at the same time, the primary pressure water flowing from the inlet passage a is the communication passage P → A valve seat chamber f →
It flows into the main valve drive pressure chamber d of the main valve device through the A valve chamber e → communication passage Pe. This primary pressure water flows gradually from the fully closed state of the main valve body 5 to the fully opened state of the main valve drive member 6 having a pressure receiving area larger than that of the main valve body 5 due to the pressure difference due to the area difference. Push open. Then, the fluid is flow channels a → b → c
The flow starts after 1 → c2. Therefore, the structure of the main valve device according to the present invention exhibits excellent operating characteristics such that abnormal boosting of the secondary pressure does not occur even in a hasty direct injection startup of a water pump or the like.

Next, after the secondary pressure reaches a predetermined value,
In response to the secondary pressure that changes depending on the amount of flow rate used on the downstream side, the A valve body 2 of the pilot valve device and the A valve body 2 of the B valve portion
4, the B valve body 25 responds to appropriately increase or decrease the internal pressure of the main valve drive pressure chamber d to maintain the predetermined secondary pressure while adjusting the opening degree of the main valve body 5. When the secondary pressure is balanced and stable, both the A valve body 24 and the B valve body 25 are stable in a substantially closed state.

Under the condition of operating as the constant pressure valve,
If the flow rate on the downstream side does not exceed the predetermined amount, the force of the spring 35 of the differential pressure cylinder device exceeds the differential pressure before and after the orifice 12, so that the piston shaft 34 of the differential pressure cylinder device is a pilot valve. It is remote from the valve shaft 26 of the device and does not interfere with the operation of the pilot valve device as a constant pressure valve. On the other hand, if the downstream flow rate becomes excessive and the predetermined amount is about to be exceeded, the differential pressure before and after the orifice 12 increases and the differential pressure applied to the piston 33 of the differential pressure cylinder device increases accordingly. The pressure overcomes the force of the spring 35 so that the piston shaft 34 abuts the valve shaft 26 of the pilot valve device and pushes in the direction opposite to the force of the spring 27 of the pilot valve device (that is, prior to its operation as a constant pressure valve). have a finger in the pie). As a result, the A valve body 24 is closed, the B valve body 25 is opened, the internal pressure of the main valve drive pressure chamber d of the main valve device is reduced toward the secondary pressure, and the main valve body 5 is moved to the front and rear surfaces thereof. The closing operation is performed by the difference in the acting thrust, the main valve opening b is throttled, and the passing flow rate is maintained at a predetermined amount.

The secondary pressure can be set to a desired value only by adjusting the force of the spring 27 of the pilot valve device by the spring force adjusting portion 29, and the spring 3 of the differential pressure cylinder device can be set.
The flow rate can be set to a desired value simply by adjusting the force of No. 5 by the spring force adjusting unit 36 or by squeezing the orifice 12 with the handle 13 or the like.

When the use of the downstream side is finished and the closing operation of the terminal pipeline is started, the secondary pressure rises accordingly, and the secondary pressure applied to the pressure receiving plate 23 of the pilot valve device is the force of the spring 27. Overcome and push it back. And
The A valve body 24 is closed, the B valve body 25 is opened, the internal pressure of the main valve drive pressure chamber d of the main valve device is reduced toward the secondary pressure, and the main valve body 5 acts on its front and rear surfaces. The closing operation is performed by the difference in the thrust force, the main valve opening b is closed and the flow is stopped, and the secondary pressure on the downstream side maintains a predetermined value. At this time, since the differential pressure before and after the orifice 12 decreases due to the decrease in the flow rate due to the closing operation of the terminal conduit, the force of the spring 35 of the differential pressure cylinder device overcomes the differential pressure before and after the orifice 12. The piston shaft 34 has returned to the state of being separated from the valve shaft 26 of the pilot valve device. (That is, it does not interfere with the operation as a constant pressure valve)

At the time when the main valve device has completed the shut-off, the seal member 5s of the main valve body 5 and the seal member 24s of the A valve body 24 are the parts that should strictly perform the function of watertightness due to the configuration of the present invention. Both are members that can easily achieve watertightness by the conventional technology. On the other hand, the seal member 6s of the main valve drive member 6, which is more difficult to manufacture more precisely,
Even if the watertightness is kept rough, abnormal pressure increase on the downstream side of the main valve does not occur. In addition, when the main valve device, the A valve portion, and the B valve portion are clogged by sand grains, dust, etc., the valves are automatically opened by a change in secondary pressure caused by the clogging. It has the excellent function of operating and eliminating clogging by self-cleaning flow.
Therefore, a fine strainer or the like is unnecessary, and maintenance management is easy.

Next, the embodiment of FIG. 2 will be described.
This is because the main valve drive member 6 is opposite to that of FIG.
2 shows an embodiment provided on the upstream side of FIG. 1, the operating direction of the main valve drive member 6 is reversed accordingly, and the positions of the A valve portion and the B valve portion are opposite to those in FIG. Although the arrangement position and the operating direction of each element are changed, the intended effect is the same as that of FIG.

Next, other application examples will be described.
Regarding the structure of the pilot valve device, in both of the embodiments shown in FIG. 1 and FIG. The two valves 24 and 25 are integrally linked to each other.
Are configured to not interfere with each other's operation. In FIG. 1, the A valve body 24 and the B valve body 25
An example is shown in which and are housed in the valve chamber e. Each chamber of the pilot valve device and the differential pressure cylinder device e; f; g; h;
With respect to the arrangement (positional relationship) and combination of i; j; u; w, various design changes can be made within the scope intended by the present invention, and the present invention is not limited to the above embodiments.

Regarding the predetermined external force applying means of the pilot valve device and the differential pressure cylinder device, in addition to the method of using an elastic member such as a spring as in each of the embodiments, for example, it is linked to a weight having a constant force. Of course, it is of course possible to add a booster mechanism or to easily apply an atmospheric pressure or hydraulic device. As for the sealing means of the pressure receiving plate 23 of the pilot valve device, in addition to the method of using the diaphragm type sealing member 28 as in each of the embodiments, a bellows type may be used or an O-ring or the like may be provided on the sliding surface of the pressure receiving plate. It may be applied to maintain water tightness. In each of the embodiments, a seal member is arranged at each place where watertightness is desired to be retained. However, in the case of design / manufacturing capable of maintaining good watertightness by direct contact, the seal member may be omitted. is there.

Regarding the structure of the main valve device, the lift valve type is applied to the main valve body 5 in each of the embodiments, but other types of open / close valves (for example, Of course, a butterfly valve, a gate valve, a ball valve, etc.) may be applied. If the material of the main valve box 1 is suitable for forming a cylinder, the cylindrical inner wall portion 8 is
The main valve box 1 can also be used as a dual function and can be omitted. The main valve spring 7 is desirable in terms of stability of the operation of the main valve body 5 at the time of the first passage of water, but since it is not particularly related to the operation thereafter, it can be omitted. In each of the embodiments, in order to simplify the structure of the main valve device, a → b → c1
→ A main valve flow path portion of c2 and the main valve drive pressure chamber d are both compactly housed in the main valve box 1. However, in addition to this, the main valve flow path portion and the main valve drive pressure chamber d d may be housed in each of the two main valve boxes, and the main valve body 5 and the main valve drive member 6 may be fixed to both ends of the main valve shaft that penetrates the two valve boxes. .

Depending on the specification conditions, in order to prevent pressure pulsation (hunting) due to an unexpected flow change during operation,
In some cases, it may be necessary to slowly operate the pilot valve device or main valve device, but as an example of how to deal with it,
FIG. 1 shows an example in which the shape of the main valve opening b is a serrated flow path for smoothing the flow rate change, and in FIG. 2, a shock absorber 14 is provided in the main valve device or a pilot valve device is provided. An example in which a throttle valve is provided in the middle of the secondary pressure communication passage to the secondary pressure chamber i is shown. Although not shown in the drawings, it goes without saying that there is a method of providing a shock absorber on the pilot valve device. Any one of these coping methods may be adopted alone, or some of them may be adopted in combination, or may be omitted under the specification condition in which it is not required.

A general on-off valve (for example, a butterfly valve, a gate valve, a ball valve, a lift valve, etc.) can be applied to the orifice 12. Also, in this orifice 12,
Since the cutoff watertightness is not essential, the seal for the valve seat can be omitted. As for the operation, in addition to the manual operation by the handle 13, it can be driven by various actuators and the driving procedure can be further automated. 1 and 2, an example in which the orifice 12 is arranged on the downstream side of the main valve is shown, but the installation position of this orifice 12 is basically on either the upstream side or the downstream side of the main valve. Good (illustration is omitted because it is obvious that it is installed upstream of the main valve).
It is desirable to install it on the downstream side because the pressure applied to the differential pressure cylinder device is relatively low and it is easy to design. On the other hand, if it is installed on the upstream side, the operation of the differential pressure cylinder device is performed by the main valve body 5. It is desirable in that it is less susceptible to the wave motion that accompanies the operation of. As in the embodiment shown in FIGS. 1 and 2, when the spring force adjusting portion 36 is provided on the spring 35 as the predetermined additional external force means of the differential pressure cylinder device, the adjustment of the predetermined additional external force means the flow rate setting. Since it means that it is meant, it is not necessary to limit to the flow rate adjustment by the throttle operation of the orifice 12. That is, in this case, the flow rate may be set only by the adjusting portion 36 of the predetermined additional external force means of the differential pressure cylinder device, and the orifice 12 may be a fixed orifice.
This is particularly effective when it is desired to suppress the occurrence of a detection error in the differential pressure across the turbulent flow when an opening / closing valve type orifice is installed.

In both FIGS. 1 and 2, a safety valve 11 suitable for the pipeline is shown at an appropriate position on the outlet flow passage side for safety management of the equipment.
This may be omitted if unnecessary. In addition, the use of the prior art is not hindered over each member constituting the valve device in the present invention, and various design changes can be made within the scope of the gist of the present invention. It is not limited to.

[0027]

The automatic regulating valve device according to the present invention has no fixed throttle passage such as a needle valve in the pilot valve device portion,
Since each valve element of the valve device opens appropriately to perform self-cleaning operation,
There is no clogging accident due to sand grains and dust, the watertightness is perfect when water is stopped, and there is a pressure adjustment function that operates without abnormal secondary pressure increase during water supply or water stoppage.
Not only is it a free valve device, but the amount of fluid supplied downstream can be automatically limited to a predetermined amount, which is extremely convenient.
In addition, the structure of the pilot valve device is simple, the secondary pressure and flow rate can be easily set with one touch, and there are no difficult parts for designing, manufacturing, operating, and maintenance management, and highly reliable and economical automatic adjustment. The valve device can be obtained, and its implementation effect is extremely large.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an overall vertical sectional view showing another embodiment of the present invention.

FIG. 3 is an overall vertical sectional view showing an example of an automatic constant pressure valve device according to a conventional technique.

[Explanation of symbols]

1 ... Main valve box 2 ... Main valve box cover 3 ... Main valve seat 4 ... Main valve shaft 5 ... Main valve body 5s ... Seal member 6 ... Main valve drive member 6s ... Seal member 7 ... Main valve spring 8 ... Cylindrical inner wall Part 9 ... Bearing 1
0 ... Bearing 11 ... Safety valve 12 ... Orifice 13 ... Handle
14 ... Shock absorber 21 ... Pilot valve box 22 ... Pilot valve box lid 2
3 ... Pilot pressure receiving plate 24 ... A valve body 24s ... Sealing member 25 ... B valve body 26 ... Pilot valve shaft 27 ... Spring 28 ... Sealing member 29 ... Spring force adjusting part 30 ... Shock absorber 31 ... Differential pressure cylinder 32 ... Differential pressure Cylinder lid 3
3 ... Piston 34 ... Piston shaft 35 ... Spring 36 ... Spring force adjusting part a ... Inlet flow path b ... Main valve opening c (c1; c2)
... outlet flow path d ... main valve drive pressure chamber e ... A valve chamber f ... A valve seat chamber g ... B valve chamber h ... B
Valve seat chamber i ... Secondary pressure chamber j ... Spring chamber u ... Orifice front pressure chamber w ... Orifice rear pressure chamber P ... Communication passage Pe ... Communication passage Q (Q1; Q2) ... Communication passage

Claims (2)

[Claims] 1. A self-regulating valve device in which a main valve device is driven in association with a pilot valve device that operates by a pressure change of a fluid passing through the main valve device, wherein the main valve device is provided inside a main valve box. A main valve body which is integrally incorporated and a main valve drive member having a pressure receiving area larger than that of the main valve body, and the main valve body is located on the upstream side of the main valve seat and between the main valve seat and The main valve drive member is slidably fitted to the cylindrical inner wall portion of the main valve box to form a main valve drive pressure chamber between the main valve drive member and the inner wall portion of the pilot valve. The device has a coaxial pilot A valve part and pilot B valve part which are operated by the balance between the downstream pressure of the main valve device and the opposing acting force of the predetermined additional external force means. When they are at the specified value, they will both remain almost closed, and will open if the pressure on the downstream side of the main valve becomes lower than the specified value. And said pilot A valve unit, and the said pilot B valve unit main valve downstream pressure is opened if higher than a predetermined value,
In the middle, through the main valve drive pressure chamber, is connected in series between the inlet flow path and the outlet flow path of the main valve device, and of the orifice attached in the flow path of the main valve device. A differential pressure cylinder device that operates by a balance between the front-rear differential pressure and the opposing acting force of the predetermined additional external force means is attached to the pilot valve device, and if the front-rear differential pressure of the orifice becomes higher than a predetermined value, the pilot A; An automatic regulating valve device, characterized in that it is constructed so as to push both valve parts B in a direction opposite to the force of a predetermined external force applying means of the pilot valve device. 2. The self-regulating valve device according to claim 1, wherein the orifice is a variable orifice.