JP4462835B2 - Automatic adjustment valve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic adjustment valve device installed in a fluid transportation pipeline, and more particularly to a differential pressure adjustment valve that automatically maintains a differential pressure before and after the valve at a predetermined value. In the present specification, the terms “water” and “liquid” generically represent fluids.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in air conditioning and heating / cooling facilities for high-rise buildings, it is common practice to circulate cold water or hot water produced by a heat exchanger installed underground to the air conditioning equipment on each floor by a pump.
As an example, FIG. 3 shows a case where the circulation circuit is a sealed circuit. In this case, the heat exchanger 103 and the pump 104 can be operated at a constant flow rate even if the load on the circulation circuit fluctuates due to temperature control of the air conditioning equipment 101 on each floor (opening / closing control of the on / off valve 102 associated with the air conditioning equipment 101). For this reason, an automatic adjustment valve device V (so-called “differential pressure adjustment” for keeping the differential pressure between the forward path 107 and the return path 108 of the circulation circuit or the differential pressure before and after the pump 104 constant. Valve ”) is often provided.
Conventionally, as a differential pressure regulating valve, a differential pressure regulating valve is generally detected by a pilot valve that detects a difference in pressure in the pipe before and after the pressure and operates while restricting the flow rate with a fixed throttle regulating flow path such as a needle valve. A structure for operating a piston or diaphragm for driving a main valve has been widely used.
[0003]
As shown in FIG. 4 , a typical configuration of a conventional differential pressure regulating valve includes a main valve seat 4 in an inlet channel a, an outlet channel c, and a communication channel in the main valve device M. The main valve body 5 and the main valve driving member 6 having a larger pressure receiving area than the main valve body 5 are provided in the main valve box 1 through the main valve shaft 7 so as to be movable forward and backward. The main valve drive member 6 is slidably fitted to the cylindrical wall 3 of the main valve box to form a main valve drive pressure chamber d between the main valve box cover 2 and the main valve. A pilot valve device P is provided that opens when the differential pressure across the device M becomes higher than a predetermined value, and closes when the differential pressure becomes lower. The main valve driving pressure chamber d is connected to the upstream side of the main valve via the fixed throttle control valve 11. In addition to communicating with the flow path a, it communicates with the outlet flow path c on the downstream side of the main valve via the pilot valve device P. In the pilot valve device P, the main valve upstream pressure is introduced into one side across the pressure receiving plate, and the main valve downstream pressure is introduced into the opposite side, and the balance between the front-rear differential pressure of the main valve device M and the spring biasing force The actuated valve body opens and closes the pilot flow path.
With this configuration, when the differential pressure across the main valve device M becomes higher than a predetermined value, the pilot valve device P is opened, and the internal pressure of the main valve drive pressure chamber d decreases toward the main valve downstream pressure. When the main valve body 5 is opened and the differential pressure across the main valve device M is lower than a predetermined value, the pilot valve device P is closed and the internal pressure of the main valve drive pressure chamber d is increased. The pressure rises toward the pressure upstream of the main valve, the main valve body 5 is closed, and the flow rate of the main valve device M is adjusted by these automatic opening and closing operations to keep the front-rear differential pressure constant.
[0004]
[Problems to be solved by the invention]
However, the differential pressure regulating valve according to this conventional technique has the following problems in terms of maintenance troublesomeness and durability.
(1) The seal member 6s where the main valve drive member 6 is in contact with the cylindrical wall portion 3 has many structures that require a perfect sealing property that does not allow leakage when the main valve is closed, and pursues various sealing means. In addition, we are trying to solve the problem by adopting bellows and diaphragms, but the larger the size and the higher the pressure, the more difficult the durability and processing accuracy of the seal part, and the more troublesome maintenance management is. Remains. That is, liquid leaks to the downstream side easily when the main valve is closed.
(2) For the purpose of preventing the influence of pressure pulsation (so-called “chattering” and “hunting”) due to a sudden flow change, it is necessary to drive the main valve device M slowly. Then, a fixed throttle control valve 11 such as a needle valve is required in the middle of the communication path for introducing the liquid upstream of the main valve, and this fixed fine flow path is a cause of clogging accidents such as scale and foreign matter. It becomes. For this reason, a strainer or the like is necessary, and it is difficult to handle other than the cleaning liquid.
(3) The pressure increase / decrease control of the main valve drive pressure chamber d is performed exclusively by the increase / decrease control of the pilot liquid discharged to the outlet flow path c via the pilot valve device P, and during that time also via the fixed throttle control valve 11 Since the pilot liquid always flows from the inlet channel a, the pressure increase / decrease control of the main valve driving pressure chamber d is difficult to perform quickly.
(4) The adjustment for setting a predetermined differential pressure is an adjustment while observing the balance between the fixed throttle control valve 11 such as a needle valve and the pilot valve device P, which takes time in operation and maintenance management. .
[0005]
A “direct acting” differential pressure regulating valve in which the pilot valve device and the main valve device are integrated is also widely used. However, this direct acting type also relies on the same technical idea. Also, it has the problems (1) to (4).
Therefore, the present invention not only exhibits an excellent automatic adjustment function as a differential pressure adjustment valve, but also has a perfect shut-off sealing function, and further, a fixed throttle adjustment flow path such as a needle valve from the pilot valve device section. The purpose is to obtain an easy-to-use and easy-to-use self-regulating valve device that has a function to prevent clogging due to the self-cleaning operation of the pilot valve device, and that is quick in operation but less susceptible to chattering and hunting. And
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides:
In the automatic adjustment valve device in which the main valve device is driven in conjunction with the pilot valve device,
The main valve device includes a main valve body integrated into the main valve box and a main valve driving member having a larger pressure receiving area than the main valve body, and the main valve body is located upstream of the main valve seat. And a throttle passage is formed between the main valve seat and the main valve drive member is disposed upstream of the main valve seat and is slidably fitted to the cylindrical wall of the main valve box. Forming a main valve drive pressure chamber in the cylindrical wall,
The pilot valve device includes a pilot A valve device and a pilot B valve device that operate in conjunction with each other by a balance of opposing acting forces between the differential pressure across the main valve device and a predetermined pressure means, and the pilot A valve device includes the main valve device. When the differential pressure across the valve device becomes higher than a predetermined value, the valve is closed. When the differential pressure across the main valve device becomes higher than a predetermined value, the pilot B valve device is opened. Both the pilot A valve device and the pilot B valve device are coaxially arranged opposite to each other and open and close in opposite directions in accordance with a change in the differential pressure across the main valve device,
The upstream side of the main valve device and the main valve drive pressure chamber communicate with each other via the pilot A valve device, and the downstream side of the main valve device and the main valve drive pressure chamber communicate with the pilot B valve device. It is characterized by being communicated through.
[0007]
Based on the above configuration, in the automatic adjustment valve device of the present invention, the pilot A valve device and the pilot B valve device that open and close according to the change in the differential pressure across the main valve device perform interlocking operations, and the main valve drive pressure chamber The internal flow pressure is appropriately increased and decreased, and the passage flow rate is automatically controlled while adjusting the opening of the main valve body, and an excellent automatic adjustment function as a differential pressure adjustment valve is exhibited. Moreover, the cut-off hermeticity can be easily achieved.
Also, since neither the pilot A valve device nor the B valve device has a fixed throttle adjustment flow path such as a needle valve, clogging due to scale and foreign matter is unlikely to occur, and clogging may occur. However, it also has a function of eliminating clogging by performing a self-cleaning operation in which the valve body automatically opens due to a pressure change caused by the clogging.
Then, both the pilot A valve device and the B valve device are integrally interlocked to mix the main valve upstream pressure and the main valve downstream pressure in the pilot valve device, and drive the resultant pressure to the main valve. The system is quick to respond to changes in flow conditions by sending it to the pressure chamber. In addition, chattering and hunting are less likely to occur.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described with reference to the drawings showing examples.
For convenience, the pilot A valve device is “A valve device”, the valve body is “A valve body”, the pilot B valve device is “B valve device”, the valve body is “B valve body”, The upstream pressure of the main valve device is referred to as “primary pressure”, and the downstream pressure of the main valve device is referred to as “secondary pressure”. In addition, members having a common role in the respective drawings are denoted by common drawing symbols.
First, referring to FIG. 1 showing the first embodiment, in the figure of the main valve device M, 1 denotes a main valve box having an inlet channel a and an outlet channel c, and 2 denotes a main valve box. The valve box lid is shown. 4 is a main valve seat. In the main valve box 1, a main valve body 5 provided on the upstream side with respect to the main valve seat 4 and a seal member 6 s (this seal is a current flow) with respect to the cylindrical wall portion 3 of the main valve box 1. The main valve drive member 6 is slidably fitted via a main valve shaft 7 in which the two members 5; 6 are integrally combined. The main valve shaft 7 is supported by a bearing 10 so as to freely advance and retract. The main valve drive member 6, the cylindrical wall 3 and the main valve box cover 2 are wrapped to form a bag-like main valve drive pressure chamber d, and the main valve body 5 is driven by increasing or decreasing the internal pressure. Then, the main valve opening b between the main valve seat 4 is opened and closed. The relationship of the pressure receiving area between the main valve body 5 and the main valve driving member 6 is set so that the main valve driving member 6 is larger.
[0009]
In response to the change in the differential pressure across the main valve device M, the A valve device is closed when the differential pressure across the main valve device M is higher than a predetermined value, and is opened when the pressure difference is lower, and the main valve device M. The B valve device that opens when the differential pressure before and after becomes higher than a predetermined value and closes when the differential pressure decreases becomes lower between the upstream side of the main valve and the downstream side of the main valve via the main valve drive pressure chamber d. The main valve drive pressure chamber d is configured in a basic structure that functions as a main valve drive working pressure chamber by communicating with each other in series.
[0010]
In the figure of a pilot valve device, 21 indicates a valve box and 22 indicates a valve box lid. In the valve box 21, an A valve chamber f of the A valve device, a B valve chamber h of the B valve device, an intermediate chamber g between the A valve device and the B valve device, and a secondary pressure chamber j are formed. . An A valve body 24 is disposed in the A valve chamber f, a B valve body 25 is disposed in the B valve chamber h, and an intermediate chamber g is provided between the A valve chamber f and the B valve chamber h. It is arranged. The A-valve body 24 and the B-valve body 25 are coaxial and interlocked, and a cylinder / piston style valve opening / closing mechanism is applied so as not to interfere with each other's operation. Further, at the time of the operation, not only the state in which one is opened but the other is closed, as well as the state in which both the valve bodies 24; Reference numeral 23 denotes a pressure receiving plate, 23 s denotes a seal member, and 26 denotes a valve shaft for combining both valve bodies 24; 25 integrally with the pressure receiving plate 23. Further, a primary pressure chamber i is formed on the valve box cover 22 side, and a spring 27 (the illustrated example is a compression coil spring) is attached as a predetermined pressure means.
[0011]
In addition, about the B valve body 25, in order to show the exact sealing performance at the time of closing, the sealing member is illustrated. Further, it is shown that the A valve body 24 does not need to be strictly sealed when closed and may be somewhat leaky. Of course, there is no problem even if a strict sealing property is added to the A valve body 24. Further, in the case of a specification that does not require the shut-off sealing function, both the valve bodies 24; 25 do not require strict sealing when closed.
The primary pressure chamber i communicates with the primary pressure in the inlet channel a through the communication path r1, and the secondary pressure chamber j communicates with the secondary pressure in the outlet channel c through the communication path r2. The A valve chamber f communicates with the inlet flow path a through the communication path p, the intermediate chamber g communicates with the main valve drive pressure chamber d through the communication path m, and the B valve chamber h communicates with the outlet flow path c through the communication path q. It is communicated.
[0012]
Next, the operation of the present invention will be described.
The circulation circuit illustrated in FIG. 3 (heat exchanger 103 → liquid feeding equipment such as pump 104, check valve 105, on-off valve 106 → circulation forward path 107 → equipment on each floor such as air conditioning equipment 101, on-off valve 102 → circulation return path 108 → In the heat exchanger 103), in order to maintain a constant pressure difference between the circulation forward path 107 and the circulation return path 108, a bypass pipe is provided between the circulation forward path 107 and the circulation return path 108, and the bypass pipe is subjected to the first implementation. The operation mode of the automatic adjustment valve device V of the example (FIG. 1) will be seen.
First, in the stage from the start of the operation of the pump until the differential pressure across the main valve device M reaches a predetermined value, the force of the spring 27 is 1 in the pilot valve device (A valve device; B valve device). The internal pressure difference between the secondary pressure chamber i and the secondary pressure chamber j (that is, the differential pressure across the main valve device M) is overcome, and the pressure receiving plate 23 is pushed in the direction in which the spring 27 extends (that is, in the left direction in the figure). Has been. Accordingly, the A valve body 24 is opened, and the B valve body 25 is closed. As a result, the internal pressure of the main valve driving pressure chamber d is the primary pressure, so that the main valve body 5 acts on the front and rear surfaces thereof. The seal member 5s of the main valve body 5 and the seal member of the B valve body 25 are kept sealed by the pressure difference.
Needless to say, the force of the spring 27 is selected so as to have a range value that can balance the required differential pressure across the main valve device M.
[0013]
Next, when the differential pressure across the main valve device M increases and exceeds a predetermined value, in the pilot valve device, the internal pressure difference between the primary pressure chamber i and the secondary pressure chamber j (that is, the main pressure device j) The differential pressure across the valve device M) overcomes the force of the spring 27, and the pressure receiving plate 23 is pushed back in the direction in which the spring 27 is contracted (ie, in the right direction in the figure). Then, the A valve body 24 is closed and the B valve body 25 is opened, whereby the internal pressure of the main valve driving pressure chamber d decreases toward the secondary pressure, and the main valve body 5 and the main pressure receiving area larger than that are obtained. The main valve body 5 is pushed open by the pressure difference due to the area difference with the valve drive member 6, and the flow flows in the direction of the inlet flow path a → the main valve opening b → the outlet flow path c, and the main valve device Suppresses the rise in differential pressure across M.
Next, after the front-rear differential pressure of the main valve device M returns to a predetermined value, the A-valve body receives the change of the front-rear differential pressure of the main valve device M, which changes due to the amount of flow used in the air conditioning equipment on each floor. 24 and the B valve body 25 respond to each other, and the internal pressure of the main valve drive pressure chamber d is appropriately increased or decreased to maintain a predetermined front-rear differential pressure while adjusting the opening of the main valve body 5. When the differential pressure across the main valve device M is stable, both valve bodies 24; 25 are stable in a substantially closed state, and the main valve body 5 is also stabilized without vibration.
[0014]
When the operation of the pump is stopped, the differential pressure across the main valve device M disappears. Therefore, in the pilot valve device, the pressure receiving plate 23 is pushed in the direction in which the spring 27 extends (that is, the left direction in the figure), and the A valve The body 24 is opened and the B-valve body 25 is closed, so that the main valve body 5 is closed.
When the main valve body 5 is closed, the portion that strictly functions as a seal is the seal member 5s of the main valve body 5 and the seal member of the B valve body 25, which can be easily sealed by conventional techniques. It is a member that can achieve. On the other hand, even if the sealing member 6s of the main valve driving member 6 is left with a rough sealing property, it does not cause a liquid leak to the downstream side.
With the above operation, an accurate function as a differential pressure regulating valve is achieved. It should be noted that the required differential pressure set value can be adjusted by adjusting the spring 27 with the adjustment screw 28 with one touch.
[0015]
Since neither the A valve device nor the B valve device has a fixed throttle adjustment channel such as a needle valve, clogging due to scale, foreign matter, etc. is unlikely to occur. In addition, even if clogging occurs, a self-cleaning operation is performed in which the valve bodies 24; 25 are automatically opened due to a pressure change caused by the clogging. That is, for example, if the A valve body 24 is clogged, the introduction of the primary pressure from the communication path p to the main valve driving pressure chamber d is hindered, so that the internal pressure of the main valve driving pressure chamber d decreases, The main valve body 5 operates in the valve opening direction to increase the passage flow rate, thereby reducing the differential pressure across the main valve device M. As a result, the A valve body 24 moves in the valve opening direction and becomes clogged. Is automatically eliminated. Since this self-cleaning operation has an excellent function of eliminating clogging, a fine strainer or the like is unnecessary and maintenance management is easy.
The A valve body 24 and the B valve body 25 are provided so as to be aligned on one valve shaft 26, and are integrally linked to one predetermined pressure means (spring 27), and 1 in the pilot valve device. It is a simple and rational mechanism that mixes the secondary pressure and the secondary pressure and sends the combined pressure to the main valve drive pressure chamber d to quickly respond to changes in the flow state. It is. In addition, both valve bodies 24; 25 are arranged at a position interval that can produce not only a state in which one is opened and the other is closed but also a state in which both the valve bodies are almost closed during operation, so that the flow condition is stable. When the valve body is in a closed state, both valve bodies are stabilized in a substantially closed state, and therefore chattering and hunting in which the valve bodies vibrate are unlikely to occur.
[0016]
In FIG. 1, as an example of a countermeasure method when it is desired to reliably suppress chattering or hunting of the main valve device M due to an unexpected flow change, the braking device 8 including a cylinder member and a piston member is included in the main valve device M. The one provided with (damper) is shown.
The on-off valve 29 provided in the communication path q is used when the main valve device M is forcibly closed separately regardless of the operation of the pilot valve device, and is always open. . In order to close the main valve device M, the on-off valve 29 may be closed, whereby the internal pressure of the main valve drive pressure chamber d increases toward the primary pressure, and the main valve body 5 is closed. This on-off valve 29 may be operated manually or remotely using various actuators. On the other hand, when it is necessary to forcibly open the main valve device M separately, although not shown, a separate on-off valve is provided between the communication path m and the communication path q (always). It can be opened).
[0017]
Next, in the second embodiment of FIG. 2, the A valve body 24 and the B valve body 25 of the first embodiment coexist in the intermediate chamber g, and the operating direction of the spring 27 is the same as that of the first embodiment. It is the reverse. With these partial changes, the communication passage piping is also slightly different from that of the first embodiment, but the other configurations and functions and effects are the same as those of the first embodiment, so detailed description thereof will be omitted.
FIG. 2 shows an example in which the main valve body 5 is integrated with the main valve drive member 6. Further, as an example of a coping method when it is desired to reliably suppress chattering and hunting due to unexpected flow changes. Also shown is a brake device (damper) formed on the main valve drive member 6 itself. In the structure, the cylindrical wall portion 3 of the main valve box 1 is provided with a concentric cylinder portion 3a and a cylinder diameter-reducing portion 3b, and the outer peripheral portion of the main valve drive member 6 is provided with a concentric piston portion 6a and a piston expansion portion. In the predetermined section (section in which the main valve body 5 approaches the main valve seat 4) in the forward / backward movement of the main valve drive member 6, the piston expanded diameter section 6b is provided for the cylinder section 3a. Slidably contact each other, and the piston portion 6a faces and slidably contacts the cylinder reduced diameter portion 3b, thereby braking the forward / backward movement of the main valve drive member 6 between the piston enlarged diameter portion 6b and the cylinder reduced diameter portion 3b. A damper chamber 8 is formed. Braking is performed by appropriately designing the shape of the gap between the cylindrical wall portion 3 and the main valve driving member 6 or by forming a small hole that allows the inside and outside of the damper chamber 8 to communicate and the flow rate of the passage to be adjusted. It goes without saying that the start timing can be set and the braking force can be adjusted.
FIG. 2 also shows an example in which a siphon pipe with an on-off valve 12 is attached so that water can be drained from the main valve driving pressure chamber d in a timely manner for inspection and maintenance. .
[ 0018 ]
Next, technical matters common to the embodiments of the present invention will be described.
As for the pilot valve device, in any embodiment, as an example of a mechanism in which the A valve body 24 and the B valve body 25 are interlocked and do not interfere with each other's operation, a cylinder / piston type valve opening / closing Although a mechanism is illustrated, a mode other than the cylinder / piston mode may be used, and the valve bodies 24; 25 may be provided on separate valve shafts. In addition, the arrangement (positional relationship) and combination of the chambers f; g; h; i; j of the pilot valve device, the associated communication pipes, and the like can be modified within the scope of the present invention. The structure of the valve device is not limited to the above embodiments.
As for the predetermined pressure means of the pilot valve device, in addition to the method using the spring 27 as in each embodiment, other elastic members are used, linked to a weight, a booster mechanism is added, Of course, application of a hydraulic device or the like can be easily performed.
[ 0019 ]
As for the main valve device M, the lift valve type is applied to the main valve body 5 in each embodiment, but other types of on-off valves (for example, butterfly valves, gates, etc.) are within the scope of the present invention. Valve, ball valve, etc.) may be applied. Further, as shown in the second embodiment, the main valve body 5 and the main valve drive member 6 may be formed as an integral member. In each of the embodiments, in order to simplify the structure of the main valve device M, both the main valve flow path part a → b → c and the main valve drive pressure chamber d are made compact in the main valve box 1. In addition to this, the main valve flow path section and the main valve drive pressure chamber d are stored in each of the main valve boxes divided into two, and the two valve boxes are penetrated. There may be a structure in which the main valve body 5 and the main valve driving member 6 are mounted on both ends of the valve shaft.
[ 0020 ]
Depending on the specification conditions, it may be necessary to operate the main valve device M slowly in order to prevent the effects of pressure pulsation (chattering or hunting) due to unexpected flow changes. As shown in each of the embodiments, the shape of the main valve opening b is a sawtooth flow path that makes the flow rate change smooth, or the main valve device M includes a braking device 8 (damper) that includes a cylinder member and a piston member. ) Or a brake device 8 (damper) may be formed on the main valve drive member 6 itself. In addition, although illustration is omitted, there are other methods such as providing a brake device in the pilot valve device and appropriately narrowing the communication path. Any one of these countermeasures may be employed alone, or some may be employed in combination, or may be omitted under specification conditions where it is not required.
[ 0021 ]
Throughout each embodiment, O-rings, seal rings, diaphragms, bellows, etc. may be applied as appropriate according to local specifications for seal members that are installed in places that require tightness. If the sealing property can be maintained, the sealing member may be omitted. Needless to say, comb-shaped protrusions, rectifying grids, and the like may be formed in places where high-speed flow may pass for the purpose of preventing cavitation.
In addition, over the members constituting the valve device of the present invention, the use of the prior art is not disturbed, and various design changes can be made within the scope of the present invention. It is not limited to.
[ 0022 ]
【The invention's effect】
The automatic adjustment valve device of the present invention not only exhibits an excellent automatic adjustment function as a differential pressure adjustment valve, but also has a perfect shut-off sealing function, and a fixed throttle such as a needle valve in the pilot valve device section. There is no adjustment flow path, and even if the pilot valve device is clogged, the valve body automatically performs a self-cleaning operation that prevents the occurrence of clogging accidents due to scale, foreign matter, etc. It also has. Further, chattering and hunting hardly occur while the operation is quick. In addition, the pilot valve device and other parts are simple in structure, easy to increase in size and pressure, and can easily set and adjust the required differential pressure with a single touch, making it difficult to design, manufacture, operate and maintain. As a result, a convenient automatic adjustment valve device having high reliability and economy can be obtained, and its effect is extremely large.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention .
FIG. 3 is an explanatory view showing an installation example of a differential pressure regulating valve.
FIG. 4 is a longitudinal sectional view showing an example of a differential pressure regulating valve according to the prior art.
[Explanation of symbols]
V ... Automatic adjustment valve device M ... Main valve device 1 ... Main valve box 2 ... Main valve box cover 3 ... Cylindrical wall portion 3a ... Cylinder portion 3b ... Cylinder reduced diameter portion 4 ... Main valve seat 5 ... Main valve body 5s ... Seal member 6 ... main valve drive member 6a ... piston part 6b ... piston enlarged diameter part 6s ... seal member 7 ... main valve shaft 8 ... braking device (damper chamber )
DESCRIPTION OF SYMBOLS 10 ... Bearing 11 ... Fixed throttle control valve 12 ... On-off valve P ... Pilot valve apparatus A ... Pilot A valve apparatus B ... Pilot B valve apparatus 21 ... Valve box 22 ... Valve box cover 23 ... Pressure receiving plate 23s ... Seal member 24 ... A Valve body 25 ... B valve body 26 ... Valve shaft 27 ... Spring 28 ... Adjustment screw 29 ... Open / close valve a ... Inlet passage b ... Main valve opening c ... Outlet passage d ... Main valve drive pressure chamber f ... A valve chamber g ... Intermediate chamber h ... B valve chamber i ... Primary pressure chamber j ... Secondary pressure chamber m; p; q; r1; r2 ... Communication passage 101 ... Air conditioner 102 ... Open / close valve 103 ... Heat exchanger 104 ... Pump 105 ... Check valve 106 ... On-off valve 107 ... Circulation forward path 108 ... Circulation return path

Claims (1)

In the automatic adjustment valve device in which the main valve device is driven in conjunction with the pilot valve device,
The main valve device includes a main valve body integrated into the main valve box and a main valve driving member having a larger pressure receiving area than the main valve body, and the main valve body is located upstream of the main valve seat. And a throttle passage is formed between the main valve seat and the main valve drive member is disposed upstream of the main valve seat and is slidably fitted to the cylindrical wall of the main valve box. Forming a main valve drive pressure chamber in the cylindrical wall,
The pilot valve device includes a pilot A valve device and a pilot B valve device that operate in conjunction with each other by a balance of opposing acting forces between the differential pressure across the main valve device and a predetermined pressure means, and the pilot A valve device includes the main valve device. When the differential pressure across the valve device becomes higher than a predetermined value, the valve is closed. When the differential pressure across the main valve device becomes higher than a predetermined value, the pilot B valve device is opened. Both the pilot A valve device and the pilot B valve device are coaxially arranged opposite to each other and open and close in opposite directions in accordance with a change in the differential pressure across the main valve device,
The upstream side of the main valve device and the main valve drive pressure chamber communicate with each other via the pilot A valve device, and the downstream side of the main valve device and the main valve drive pressure chamber communicate with the pilot B valve device. A self-regulating valve device characterized by being communicated via

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