JPH06149384A - Pressure reducing valve device - Google Patents

Abstract

PURPOSE:To make a responsibility satisfactory, to freely set an operating characteristic, and to make a device compact by providing a valve body fixed from a secondary side chamber at a valve mouth, connecting a balancer with the valve body, and allowing the pressure of a primary side to act on. CONSTITUTION:This pressure reducing valve device is used by connecting a primary side chamber 2 with the upstream side piping of a water piping, and connecting a secondary side chamber 3 with the downstream piping. The high pressure in the primary side chamber 2 acts on the lower face of a valve body 5 and the upper face of a balancer 21. The valve body 5 is energized upward, that is, to a valve opening direction by the pressure acting on the lower face of the valve body 5. And also, the valve body 5 is energized downward by the pressure of the primary side acting on the upper face of the balancer 21. The valve body 5 is energized in the valve opening direction by a force acting on an area obtained by subtracting the pressure receiving area of the balancer from the pressure receiving area of the valve body 5. On the other hand, the pressure in the secondary side chamber 3 acts on the back face of the valve body 5, and the pressure of the secondary side acts also on a pressure receiver 10. Then, the valve body 5 is closed by those forces.

Description

Detailed Description of the Invention

[0001]

The present invention is used in water supply facilities,
The present invention relates to a pressure reducing valve device that reduces pressure at a predetermined pressure reducing ratio. More specifically, the present invention relates to a pressure reducing valve device that can be miniaturized while achieving stable operation with arbitrary characteristics.

[0002]

2. Description of the Related Art Conventionally, in water facilities such as high-rise buildings,
A pressure reducing valve device for reducing the pressure is provided. Such a pressure reducing valve device reduces the pressure on the primary side at a predetermined pressure reducing ratio to adjust the water supply water pressure.

A conventional pressure reducing valve device of this type is provided with a valve body seated in a secondary side chamber on the low pressure side at a valve port formed in a valve box, for example, and a pressure chamber is formed in the valve box. A pressure receiving body such as a piston is slidably provided in the pressure chamber in a liquid-tight manner, and the pressure receiving body is connected to the valve body. The pressure receiving body is configured so that the pressure on the secondary side acts.

In such a pressure reducing valve device, the pressure in the primary chamber of the high pressure side acts on the valve element to urge the valve element in a direction to open the valve element. Also, the pressure on the secondary side acts on the back side of this valve body, and the pressure on the secondary side also acts on the pressure receiving body, and the valve body closes due to the pressure on the secondary side acting on these. Is biased in the direction.

With this structure, the pressure reducing valve device reduces the pressure on the secondary side at a predetermined pressure reducing ratio in accordance with the relationship between the pressure receiving area of the valve body and the pressure receiving area of the pressure receiving body. That is, when the ratio of the pressure receiving area of the valve body and the total of the pressure receiving area on the back side of the valve body and the pressure receiving area of the pressure receiving body is, for example, 1: 3, the pressure on the primary side and the pressure on the secondary side are When the ratio of and becomes 3: 1, the pressures acting on them are balanced. Then, for example, when the pressure on the secondary side decreases, the urging force that urges the valve element in the valve closing direction decreases, the opening degree of the valve element increases, the flow rate increases, and the pressure on the secondary side increases. Then, the pressure on the primary side and the pressure on the secondary side are always adjusted to 3: 1.

[0006]

However, the above conventional pressure reducing valve device is not satisfactory in terms of its operating characteristics. For example, the pressure receiving areas of the valve body and the pressure receiving body are limited to a predetermined relationship by the set pressure reduction ratio. For example, if the pressure reduction ratio is n: 1 and the pressure receiving area of the primary pressure acting on the valve body and the pressure receiving area of the secondary pressure acting on the back side of the valve body are equal, The pressure receiving area of the body must be set to n-1 times the pressure receiving area of the valve body.

Therefore, when the pressure reduction ratio n becomes large, the pressure receiving area of the pressure receiving body becomes extremely large. For this reason, the pressure reducing valve device becomes large in size, the inertial mass of the movable parts such as the valve body and the pressure receiving body becomes large, and the sliding resistance of the seal for maintaining the liquid tightness of the pressure receiving body becomes large. . Therefore, in the pressure reducing valve device having a large pressure reducing ratio, its responsiveness is lowered.

Therefore, it takes a long time for the opening of the valve body to follow the fluctuation of the pressure on the secondary side, the overshoot of the opening / closing operation of the valve body becomes large, and the vibration of the valve body is increased. It may occur or hinder smooth operation. Such a problem becomes more serious when the pressure reducing valve device is large and the pressure reducing ratio is large.

The present invention has been made in view of the above circumstances, and provides a pressure reducing valve device which is excellent in responsiveness, can freely set the operating characteristics, and can be formed in a small size as a whole. It is a thing.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a valve body which is seated from the secondary chamber side is provided at a valve opening, and a pressure receiving body which is connected to the valve body and on which the pressure on the secondary side acts is provided. The balance body is connected to the valve body, and the pressure on the primary side acts on the balance body. The pressure receiving area of the balance body is set to be smaller than the pressure receiving area of the valve body.

[0011]

In such a pressure reducing valve device, the high pressure on the primary side acts on the valve element to urge the valve element in the valve opening direction. On the other hand, the pressure on the primary side acts on the balance body and urges the valve body in the valve closing direction. Therefore, the valve body is biased in the valve opening direction by the pressure on the primary side that acts on the area obtained by subtracting the pressure receiving area of the balance body from the pressure receiving area of the valve body. Further, the valve body is urged in the valve closing direction by the pressure on the rear side of the valve body and the secondary side on the low pressure side that acts on the pressure receiving body. Therefore, in this pressure reducing valve device, the ratio of the area obtained by subtracting the pressure receiving area of the balance body from the pressure receiving area of the valve body and the sum of the pressure receiving areas of the back side of the valve body and the pressure receiving body becomes a predetermined pressure reducing ratio.

In such a case, when the pressure reducing valve device having a predetermined pressure reducing ratio is designed, the pressure receiving area of the pressure receiving body can be arbitrarily set by changing the pressure receiving area of the balance body. For example, even if the pressure reduction ratio is the same, increasing the pressure receiving area of the balance body can reduce the pressure receiving area of the pressure receiving body, and conversely, decreasing the pressure receiving area of the balance body can reduce the pressure receiving area of the pressure receiving body. The area becomes large.

Therefore, the pressure receiving area of the pressure receiving body is reduced, the inertial mass of these movable parts is reduced, and the sliding resistance of these seal portions is also reduced to design a pressure reducing valve device having good responsiveness. can do. It should be noted that this response is preferably set to an optimum characteristic according to the actual specifications. In this respect, in the case of the present invention, the pressure receiving area of the balancer is changed as described above, and the response characteristic of the pressure reducing valve device is changed. It is possible to set the operating characteristics such as the optimum characteristics. Further, the pressure reducing valve device of the present invention can reduce the pressure receiving area of the pressure receiving body, and can reduce the entire size.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a pressure reducing valve device for a water supply facility.

Reference numeral 1 in the drawing is a valve box, and in the valve box 1, a high pressure side primary side chamber 2 and a low pressure side secondary side chamber 3 are formed. A valve port 4 that connects the primary side chamber 2 and the secondary side chamber 3 is formed in the valve box 1.
Then, the valve body 5 is seated on the valve opening 4 from the secondary side chamber 3 side, and the valve body 4 opens and closes the valve opening 4. A valve shaft 6 is projectingly provided on the valve body 5.

A cylindrical pressure receiving chamber 9 is formed in the lid 7 of the valve box 1. The pressure receiving chamber 9 is a partition member 8
Is separated from the inside of the main body of the valve box 1. A pressure receiving body 10 is slidably housed in the pressure chamber 9 in a liquid-tight manner. An O-ring 11 is provided on the outer peripheral portion of the pressure receiving body 10 to maintain liquid tightness with the inner peripheral surface of the pressure chamber 10.

The valve shaft 6 of the valve body 5 slidably penetrates the central portion of the partition member 8 in a liquid-tight manner,
It extends into the pressure chamber 10. The pressure receiving body 10 is attached to the tip of the valve shaft 6.

The pressure receiving body 10 divides the interior of the pressure chamber 9 into upper and lower parts, and the lower part communicates with the atmosphere through the open passage 13. In addition, the lid 7 described above
A communication passage 12 is formed in this, and by this communication passage 12,
The upper part of the pressure chamber 9 and the inside of the secondary chamber 3 are communicated with each other. Therefore, the pressure in the secondary side chamber 3 is introduced into the upper portion of the pressure chamber 19 via the communication passage 12, and is configured to act on the upper surface of the pressure receiving body 10.

The stopper 1 is provided on the top of the lid 7.
4 is screwed in a liquid-tight manner, and the lower end of the stopper 14 faces the upper end surface of the valve shaft 6. Then, when the pressure receiving body 10 rises together with the valve shaft 6, the valve shaft 6 comes into contact with the stopper 14 and the pressure receiving body 10
And the upward stroke of the valve body 5 is restricted. It should be noted that the position of the stopper 14 can be adjusted by rotating the stopper 14 and screwing it forward.
Also, the stroke of the valve body 5 can be adjusted.

A cylindrical balancing chamber 20 is formed at the bottom of the valve box 1. The balance chamber 20 is arranged concentrically with the valve port 4 and its upper end is open inside the primary chamber 2. A piston-shaped balance body 21 is slidably housed in the balance chamber 20 in a liquid-tight manner. It should be noted that the balance body 21 has an O
A ring 23 is provided to maintain liquid tightness with the inner peripheral surface of the balance chamber 20.

The balance body 21 is connected to the valve body 5 via a sub valve shaft 22. The inside of the balance chamber 20 is vertically divided by the balance body 21, and the upper surface of the balance body 21 is configured so that the pressure in the primary chamber 2 acts. Also, this balancing chamber 20
The lower part of is communicated with the atmosphere by an open passage 24.
The pressure receiving area of the balance body 21 is set smaller than the pressure receiving area of the valve body 5.

Next, the operation of the pressure reducing valve device thus constructed will be described. This pressure reducing valve device is used in the primary side chamber 2 described above.
Is connected to the pipe on the upstream side of the water pipe, and the secondary chamber 3 is connected to the pipe on the downstream side.

The high pressure in the primary chamber 2 acts on the lower surface of the valve body 5 and the upper surface of the balance body 21. Then, the valve body 5 is biased upward, that is, in the valve opening direction by the pressure acting on the lower surface of the valve body 5. Further, due to the pressure on the primary side acting on the upper surface of the balance body 21, the valve body 5 receives downward urging force, that is, in the valve closing direction. Therefore, the valve body 5 is urged in the valve opening direction by the urging force by the pressure on the primary side that acts on the area obtained by subtracting the pressure receiving area of the balance body from the pressure receiving area of the valve body 5.

On the other hand, the pressure in the secondary chamber 3 on the low pressure side acts on the back side of the valve body 5, and the pressure receiving body 1
The pressure on the secondary side also acts on 0. Then, the urging force in the valve closing direction acts on the valve body 5 by the sum of the secondary pressures acting on them.

In this pressure reducing valve device, the urging force in the valve opening direction and the urging force in the valve closing direction acting on the valve body 5 are set in correspondence with a predetermined pressure reducing ratio. Then, when water is flowing through the pressure reducing valve device, the ratio of the pressure for urging the valve body in the valve opening direction and the pressure for urging the valve body in the valve closing direction is proportional to the relationship of the pressure receiving area. When the reciprocal of is reached, the urging force acting on the valve body 5 is balanced, and the valve body 5 maintains the opening degree in that case. Then, for example, when the pressure on the secondary side decreases, the force that urges the valve body 5 in the valve closing direction decreases, the opening degree of the valve body 5 increases, and the pressure on the secondary side increases. The valve body 5 rises and the opening degree of the valve body 5 increases until the pressure on the primary side and the pressure on the secondary side reach a predetermined ratio again. When the pressure on the secondary side rises, the force for urging the valve body 5 in the valve closing direction increases, the urging force of the valve body 5 increases, and the opening degree of the valve body 5 increases. It becomes smaller, the pressure on the secondary side decreases, and the opening degree of the valve body 5 decreases until the pressure on the primary side and the pressure on the secondary side reach a predetermined ratio. In this way, the pressure reducing valve device maintains the ratio of the pressure on the primary side to the pressure on the secondary side at a predetermined pressure reducing ratio.

In this case, the urging force of the valve element 5 in the valve opening direction is the pressure on the primary side that acts on the area obtained by subtracting the pressure receiving area of the balance body 21 from the pressure receiving area of the valve element 5, and is therefore balanced with this. The pressure receiving area of the rear side of the valve body 5 and the pressure receiving body 10 to be reduced can be reduced. Therefore, the diameter of the pressure receiving body 10 can be reduced, and the pressure reducing valve device can be formed in a small size. Also, this pressure receiving body 10
The smaller diameter reduces the inertial mass of the entire movable part, and also reduces the sliding resistance of the seal that maintains the liquid tightness of the pressure receiving body. Therefore, the responsiveness to the fluctuation of the pressure on the secondary side or the primary side is improved.

Incidentally, it is desirable that the pressure reducing valve device of this kind is designed so that its response characteristics and the like are optimally designed in accordance with the specifications and the like. The area of the pressure receiving body 10 can be freely set by changing, and a pressure reducing valve device with optimum characteristics can be designed.

The present invention is not limited to the above-described embodiments, and is not limited to, for example, a pressure reducing valve device for water facilities.
Of course, it can be applied to pressure reducing valve devices for other purposes.

[0029]

As described above, according to the present invention, when the pressure reducing valve device having a predetermined pressure reducing ratio is designed, the pressure receiving area of the pressure receiving body can be arbitrarily set by changing the pressure receiving area of the balance body. . For example, even if the pressure reduction ratio is the same, increasing the pressure receiving area of the balance body can reduce the pressure receiving area of the pressure receiving body, and conversely, decreasing the pressure receiving area of the balance body can reduce the pressure receiving area of the pressure receiving body. The area becomes large.

Therefore, the pressure receiving area of the pressure receiving body is reduced, the inertial mass of these movable parts is reduced, and the sliding resistance of these seal portions is also reduced to design a pressure reducing valve device having good responsiveness. can do. Further, the area of the pressure receiving body can be optimally set according to actual specifications, and the operating characteristics such as the response characteristics of the pressure reducing valve device can be set to the optimal characteristics. Further, since the pressure reducing valve device of the present invention can reduce the pressure receiving area of the pressure receiving body, there is an effect that the entire size can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a pressure reducing valve device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve box 2 ... Primary side chamber 3 ... Secondary side chamber 4 ... Valve port 5 ... Valve body 10 ... Pressure receiving body 20 ... Balance chamber 21 ... Balance body

Claims (1)

[Claims] 1. A valve box, a primary side chamber and a secondary side chamber formed in the valve box, a valve port communicating the primary side chamber and the secondary side chamber, and the secondary side chamber at the valve port. A valve body which is seated from the side to open and close the valve opening, a pressure chamber formed in a part of the valve box, and a pressure-tightly liquid-tightly accommodated in the pressure chamber and connected to the valve body. The pressure receiving body, the pressure chamber and the secondary side chamber are communicated with each other, and the pressure in the secondary side chamber is introduced into the pressure chamber to act on the pressure receiving body.
The communication passage for urging the valve body in the valve closing direction by the pressure on the secondary side chamber acting on the pressure receiving body, the equilibrium chamber formed in the primary chamber, and the liquid-tight movement in the equilibrium chamber. A balance body that is freely provided and connected to the valve body and has a pressure receiving area smaller than the pressure receiving area of the valve body, and the valve body is actuated by the pressure in the primary side chamber acting on the balance body. A pressure reducing valve device characterized by being urged toward the valve closing direction.