JPH08247332A - Valve device - Google Patents

Abstract

PURPOSE: To enable a valve device to be used for flow rate adjustment in both emergency interruption and normal case as well as to be used for certainly preventing reverse flow by means of good operability for opening/closing and large closing performance at the time of full closure. CONSTITUTION: In a valve device 1 comprising a valve seat 7 and a valve piece 9 whose one end is axially supported rotatably, it is provided with an operation bar 18 which moves vertically to a flow passage direction 40 so as to give turning motion to the valve piece 9, and a link 23 for connecting No.1 pin 24 set on one end of the passage side of the operation bar 18 to No.2 pin 25 set on the back surface side of the valve piece 9. By means of these respective two pins, the operation bar 18 and the link 23, and the link 23 and the valve piece 9 are provided rotatably and when the valve piece 9 is tightly attached to the valve seat 7, No.1 pin 24 occupies a position on the side opposite to the operation side of the operation bar 18 in relation to a line passing No.2 pin 25 and in parallel to the direction 40 of a passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a valve device provided in a fluid flow path, which can be used both in an emergency and in a normal time, and has a function of blocking or adjusting the flow of a fluid. The present invention relates to a valve device having

[0002]

2. Description of the Related Art Conventionally, various types of valves are known which are provided in the middle of a fluid flow path. What is shown in FIG. 5 is a so-called globe valve (groove valve) 43, which generally has a spherical valve box, the center lines of the fluid inlet 46 and the fluid outlet 47 are aligned, and the valve element 9 is the fluid inlet. It is an S-shaped valve that moves in a direction perpendicular to the center line of the fluid outlet 46 and the fluid outlet 47, moves toward and away from the valve seat 7, and flows from the fluid flow passage 39a to the flow passage 39b. It is a type of valve that resists the flow of fluid from the front and stops the flow. The advantages of this valve are that it has a good closing ability, it can be used in a squeezed state so that the flow rate can be adjusted, and that a small size can be manufactured. However, it also has the disadvantages such as high fluid resistance.

FIG. 6 shows a sluice valve (gate valve) 44, which is typical as a sluice valve for shunting the flow of piping. In this valve, generally, a disc-shaped valve element 9 comes down from above against the flow and comes into contact with the valve seat 7 so that the flow paths 39a, 39
It is a valve for closing b and fully opening or closing, that is, ON-OFF.
The advantage of this valve is that the fluid resistance when fully opened is extremely low,
Structurally large size can be manufactured, the opening and closing torque is smaller than that of the globular valve, etc.
Since a fluid vortex is generated on the back side of the valve 9 to increase fluid resistance and further cause vibration and wear, it is unsuitable for flow control. Due to the structure, the opening / closing stroke increases and the opening / closing time increases. However, it is not suitable for rapid opening and closing, and it is difficult to manufacture in the case of small diameter.

FIG. 7 shows a check valve (chuck valve) 45.
Is. The valve 9 is a valve that operates so as to prevent the reverse flow of the fluid by contacting the valve seat 7 by receiving the reverse flow pressure from the flow path 39b to the flow path 39a due to the back pressure of the fluid. Is a valve to prevent.

[0005]

The above-mentioned three valves have the above-mentioned functions, advantages and disadvantages, respectively. However, conventionally, there has not been a valve that combines the functions and advantages of these three valves. .

The object of the present invention is to be able to be used both for the functions and advantages of the sphere valve, sluice valve and check valve described above, that is, for shutting off in an emergency and adjusting the flow rate in a normal time, and also for ensuring the reverse flow. (EN) Provided is a valve device which is highly preventable, has good opening and closing operability, has a small fluid resistance when fully opened, has a large closing capability when fully closed, and can be economically manufactured in various sizes.

[0007]

In order to achieve the above object, the present invention provides a valve seat provided in a fluid flow path, and a valve whose one end is rotatably pivotally supported to come in contact with and separate from the valve seat. A valve device having a child, for shutting off or adjusting the flow of the fluid, an operating rod for rotating the valve child around the one end,
A connecting member that connects a first support shaft provided at one end on the flow path side of the operation rod and a second support shaft provided at a rear surface side opposite to a side of the valve element that contacts and separates from the valve seat. The operating rod and the connecting member and the connecting member and the valve element are rotatably provided on each of these two support shafts, and the valve is operated by moving the operating rod toward the flow path. When the child is rotated and brought into close contact with the valve seat, the first support shaft is opposite to the operation side of the operation rod with respect to a line passing through the second support shaft and parallel to the direction of the flow path. It is located on the side of.

Further, in the above invention, the operating rod is
It moves perpendicularly to the direction of the flow path.

In any of the above inventions, the shape of the inner wall of the main body of the valve device facing the side having the operation rod is parallel to the direction of the flow path.

[0010]

With the above structure, the valve device of the present invention comprises the operating rod for rotating the valve element around one end, and the connecting member for connecting the first support shaft and the second support shaft. The two pivots are rotatably provided, and when the valve element is brought into close contact with the valve seat, the first pivot passes through the second pivot and is parallel to a line parallel to the flow direction. Since it is located on the side opposite to the operating side of the operating rod, the fluid flows without resistance when the valve device is fully opened. The valve element gradually blocks the flow passage by the operation of moving the operation rod toward the flow passage side, and regulates the flow of the fluid. Since the one end of the valve element is rotatably supported, the valve element rotates together with the movement of the operation rod, and acts to throttle the fluid flow in the flow path. Further, the valve element comes into contact with and closely contacts the opening surface of the valve seat by the movement operation of the operation rod. At this time, the first support shaft is located on the side opposite to the operation side of the operation rod with respect to the line passing through the second support shaft and parallel to the direction of the flow path, so that the initial fluid may be lost for some reason. Even if an attempt is made to flow in the direction opposite to the flow direction of, the force applied to the valve due to this reverse flow is
Is applied in the direction of the support shaft, and the component of that force in the moving direction of the operating rod is applied in the direction of pulling the operating rod toward the flow path side. The backflow is reliably prevented without moving the child in the moving direction away from the valve seat. On the other hand, since the valve element can be pressed against the valve seat against the fluid dynamic pressure, the valve device can be attached to the flow path without distinguishing forward flow and reverse flow.

Further, in the above invention, since the operating rod moves vertically to the direction of the flow path, in addition to the operation of the above invention, the operation of the valve device is reliable, and the valve device is manufactured. Is easy and economical.

In any one of the above inventions, since the shape of the inner wall of the main body of the valve device facing the side where the operation rod is located is parallel to the direction of the flow path, the inner wall is suspended in the fluid. No foreign matter is deposited and does not hinder the close contact between the valve and the valve seat.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the valve device of the present invention will be described below with reference to the drawings. 1 shows an embodiment of a valve device according to the present invention, a sectional view of a state where a valve element is in close contact with a valve seat to block the flow of fluid, and FIG. 2 shows a valve device in the embodiment of the valve device of FIG. FIG. 3 is a sectional view showing a state where the child is fully opened apart from the valve seat, FIG. 3 is a sectional view showing a state in which the valve child is half opened apart from the valve seat in the embodiment of the valve device of FIG. 1, and FIG. And FIG. Incidentally, in FIGS. 1 to 4, the same reference numerals are given to the same structures and acting portions.

1 to 3, a valve device 1 according to an embodiment of the present invention has a valve seat 7 provided in fluid passages 39a to 39c and a valve seat with one end 10 pivotally supported. 7, which has a flat plate-like valve element 9 which comes into contact with and separates from the valve element 7 and which blocks or regulates the flow of fluid, moves in a direction perpendicular to the direction 40 of the flow path and rotates the valve element 9 around the one end 10. The operation rod 18 to be moved, the first pin 24 that is the first support shaft provided at the one end 19 on the flow path side of the operation rod 18, and the rear side opposite to the side that contacts and separates from the valve seat 7 of the valve element 9. And a link 23 that is a connecting member that connects the second pin 25 that is a second support shaft provided on the shaft 11.

The operating rod 18, the connecting member 23, and the connecting member 23 and the valve element 9 are rotatably provided on each of these two support shafts 24, 25, and the valve is operated by moving the operating rod 18 to the flow path side. When the child 9 is rotated and brought into close contact with the valve seat 7, the first support shaft 24 passes through the second support shaft 25 and the operating side of the operating rod 18 with respect to the line 41 parallel to the direction 40 of the flow path. And is located on the opposite side. The shape of the inner wall 5 that faces the side of the main body 2 of the valve device on which the operation rod 18 is located is parallel to the direction 40 of the flow path.

Further, the valve device 1 of this embodiment has a flow passage 39c.
The main body 2 of the valve device having a space portion that forms a space, and the pipes 3 and 3 that form the flow paths 39a and 39b on both sides of this space portion.
Is connected. Steps 4 and 4 are provided on both sides of the space of the main body 2, and a valve seat 7 is fitted and fixed to one of the steps 4. The main body 2 is opened in a direction perpendicular to the flow paths 39 a to 39 c, and the cover 31 is fitted into the opened portion of the main body 2 so as to seal the O-ring 37. The cover 31 is fixed.

The operating rod 18 is supported by the cover 31 via the O-ring 36 so as to be movable in the direction perpendicular to the direction 40 of the flow path, and leakage of fluid is prevented. Furthermore, the operating rod 18
Is restricted by the cover 31 from swinging in a direction parallel to the direction 40 of the flow path even if a force is applied in a direction perpendicular to the vertical movement direction, and the rigidity of the operating rod 18 itself is increased so as to prevent this swinging. Is formed. The O-rings 36 and 37 are
It is appropriately selected depending on the conditions such as the type of fluid in the flow channel, pressure and temperature.

The operating rod 18 is designed according to the type of fluid, temperature and pressure, and the operating force in the vertical direction of the operating rod 18 is, for example, a fluid pressure of 250 mmAq and a flow path 39.
When the diameters of a and 39b are 75 A, it is about 1.1 kgf, which is relatively small. Therefore, use synthetic resin such as relatively hard hard polyethylene, stainless steel, surface-treated steel, etc. as appropriate.
Design to have sufficient strength.

The cylinder 27 is closely attached to the cover 31,
A piston 30, which is fixed and fixed to the other end 20 of the operating rod 18, slides in the cylinder 27 through the O-ring 35 as the working fluid flows in and out, thereby rotating the valve element 9.
An inlet 28 for the working fluid for moving the piston 30 to the flow channel 39c side is provided at one end side 27a of the cylinder 27, and an outlet 29 for the working fluid flowing out as the piston 30 moves is provided at the other end side 27b. Has been. When the piston 30 is operated to move to the side opposite to the flow path 39c side,
The working fluid inlet 28 is an outlet, and the working fluid outlet 29 is
Becomes the entrance.

The link 23 is provided between the first pin 24 at one end 19 of the operating rod 18 on the flow path 39c side and the second pin 25 provided on the bracket 14 on the rear side 11 of the valve element 9. The first pin 24 may be fixed to either the operation rod 18 or the link 23, or may be slidably provided on both of them, although the first pin 24 is also rotatable relative to the first pin 24. Similarly, the second pin 25 may be fixed to either the bracket 14 or the link 23, or may be slidably provided on both. The material of the link 23 is appropriately selected depending on the type of fluid, temperature, pressure, etc., but relatively hard synthetic resin such as hard polyethylene, stainless steel, surface-treated steel material, etc. are used.

The valve element 9 is a disk 12 which is in close contact with the valve seat 7.
The disk 12 is fixed to the base body 13, and is rotatably supported by a fixed support shaft 16 provided between one end 10 of the base body 13 and a bracket 33 fixed to the cover 31. The base 13 supports the disk 12 and has a material having a high rigidity, such as hard polyethylene, stainless steel,
It is formed of other metal or the like. An elastic material having a sealing property such as synthetic rubber such as silicone rubber or Teflon is fixed to the disk 12 by baking adhesion or other means. The elastic material having the sealing property of the valve element 9 may be provided on the valve seat 7 side instead of being provided on the valve element 9 side.

The main body 2 and the pipe 3 of the valve device 1 of this embodiment
Can be appropriately used, such as a relatively hard synthetic resin such as hard polyethylene, stainless steel, and a surface-treated steel material.

The valve device 1 of this embodiment having the above configuration
Works as follows. That is, in FIG. 2, first, when the valve device 1 is in the fully opened state, the valve element 9 is arranged in a state of being positioned in parallel to the flow of the fluid, and the fluid flows through the flow path 39.
The resistance flows from the a side to the flow path 39b side with very little resistance. Next, when adjusting the fluid flow, the cylinder 2
When a working fluid is supplied from the inlet 28 of the piston 7, the piston 30 is lowered to move the operating rod 18 downward in FIG. Disciple 9
The resistance of the flow path starts to increase and the flow rate adjustment starts from the state where the other end 15 of the flow path approaches the flow path 39c. Further, when the operation rod 18 is moved downward, the valve device 1 is in a half-opened state as shown in FIG. 3, and in this state the fluid flow is considerably restricted, but the resistance of the flow paths 39a to 39c is reduced. Is relatively small.

Further, when the operating rod 18 is pushed down, the valve 9
The disc 12 of the valve element 9 comes into contact with the valve seat 7 and comes into close contact therewith by pivoting around a fixed support shaft 16 provided at one end of the disc. But,
At this time, the center of the first pin 24 is located on a line 41 parallel to the direction 40 of the flow path passing through the center of the second pin 25 on the upper side or parallel line 41 in FIG. 1 (in this state). (Not shown). Further, when the operation rod 18 is pushed down, as shown in FIG. 1, the first pin 24 moves the line 41 parallel to the direction 40 of the flow path.
The valve 9 comes to be located below the parallel line 41, and the valve 9 comes into close contact with the valve seat 7. In this state, the valve 9 is the valve seat 7
It is in a so-called locked state as it is tightly tightened.

FIG. 4 is a sectional view of the main part of FIG. In this state, the center of the first pin 24 corresponds to the central shaft 21 of the operating rod 18.
And a line 41 parallel to the direction 40 of the flow path passing through the center of the second pin
It is below the intersection 42 with. If for some reason,
When the pressure on the flow channel 39b side is higher than the pressure on the flow channel 39a, 39c side shown in FIG. 1, the force applied to the valve 9 based on this pressure difference is from the center of the second pin 25. First
The force F is applied to the center of the pin 24, and the parallel line 41
The component force Fh in the direction of is a force for moving the operating rod 18 in the horizontal direction in the drawing, but the position of the first pin does not move due to the structure described above.

On the other hand, the component force Fv of the operating rod 18 in the direction of the central axis 21 acts to push the operating rod 18 downward in FIG. 4, but the position of the first pin is via the link 23 and the valve element 9. It is supported by the fixed support shaft 16 shown in FIG. 1 and does not move. Therefore, the close contact between the valve element 9 and the valve seat 7 is maintained to prevent backflow. At this time, the operating rod 18 has a lower limit stopper for the valve 9 to closely contact the valve seat 7 at a position where the first pin 24 crosses the line 41 parallel to the direction of the flow path, for example, shown in FIGS. As described above, the step portion 22 formed on the operation rod 18 is
It is more preferable to attach a stopper such as abutting the upper surface of the above to stop the operation rod 18 from descending.

In the prior art valve device, in order to maintain the surface pressure of the valve element and the valve seat when fully closed, the operating rod must be equipped with a drive part such as a screw or a spring must be installed inside the valve device body. According to the valve device 1 of this embodiment, the surface pressures of the valve element and the valve seat can be maintained by a simple link mechanism. Further, in the valve device 1 of the above embodiment, the operating rod 18
Is operated by using a double-acting cylinder and piston, and the fixing device for the operation rod 18 when the valve device 1 is fully closed need not be provided. Further, since the movement of the operating rod 18 is the movement between the cylinder and the piston, it can be operated quickly without using a complicated screw mechanism, and since it is not necessary to have a structure relying on the spring force, the drive device is simple. There are few breakdowns. Furthermore, in the valve device 1 of the above-mentioned embodiment, the double-acting cylinder and piston are used for moving the operation rod 18, but even if the pressure of the working fluid decreases or disappears, The link mechanism described above can maintain the surface pressure of the valve element and the valve seat when fully closed.

In the valve device 1 of the present embodiment, the fluid is flow path 39b.
When it is flowing from the side to the flow path 39a side, the valve element 9 functions to suppress the flow of fluid by moving the operation rod 18, and functions as the conventional globe valve 43 of FIG. Further, the valve element 9 gradually rotates and approaches the valve seat 7 and comes into close contact with the valve seat 7 after the contact so as to close the flow path, so that it functions as the conventional sluice valve 44 of FIG. Further, it has the same function as the conventional check valve 45 shown in FIG. Therefore, the valve device 1 of the present embodiment is the same as the conventional globe valve,
It has the functions of a sluice valve and a check valve, as well as the function of tightening the valve element 9.

In addition, in the valve device 1 of this embodiment, the fluid flows through the flow path 3
When the fluid flows from the 9b side to the flow channel 39a side,
It can be used for both the flow of fluid from the case of flowing from the 9a side to the flow path 39b side, and in both cases, the closing ability of the valve device 1 when fully closed is large.

In the embodiment of the present invention, the main body 2 of the valve device.
Since the shape of the lower inner wall 5 of the valve is linear along the direction 40 of the flow path, the fluid in the vicinity of the inner wall 5 of the main body 2 of the valve device constantly flows in the direction of the flow path, and the suspended foreign matter in the fluid. Does not accumulate and does not hinder the close contact between the valve 9 and the valve seat 7.

[0031]

According to the valve device of the present invention, the operating rod for rotating the valve element around one end and the connecting member for connecting the first support shaft and the second support shaft are provided. The two pivots are rotatably provided, and when the valve element is brought into close contact with the valve seat, the first pivot passes through the second pivot and is parallel to a line parallel to the flow direction. Since it is located on the side opposite to the operating side of the operating rod, the backflow can be reliably prevented even if the force for moving the operating rod is lost. On the other hand, the valve element can be brought into close contact with the valve seat against the dynamic pressure of the fluid, and this valve device can be attached to the flow path without distinguishing forward flow and reverse flow. Furthermore,
It can be used for both emergency shutoff and normal flow rate adjustment, and has good open / close operability, low fluid resistance at full opening, and high closing ability.

Further, in the above invention, since the operating rod moves vertically to the direction of the flow path, in addition to the effects of the above invention, the operation of the valve device is reliable, and the valve device is manufactured. Is easy and economical.

In any of the above inventions, the shape of the inner wall of the main body of the valve device facing the side having the operation rod is:
Since it is parallel to the direction of the flow path, floating foreign matter in the fluid does not accumulate on the inner wall and does not hinder the close contact between the valve element and the valve seat.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a valve device according to the present invention, in a state where a valve element is in close contact with a valve seat and a flow of fluid is blocked.

2 is a cross-sectional view of the valve device according to the embodiment of FIG. 1 in a state in which a valve element is fully opened apart from a valve seat.

FIG. 3 is a cross-sectional view of the valve device according to the embodiment of FIG. 1 in a state where a valve element is apart from a valve seat and is half-opened.

FIG. 4 is a sectional view of an essential part for explaining the operation of this embodiment.

FIG. 5 is a cross-sectional view showing a globe valve according to a conventional technique.

FIG. 6 is a sectional view showing a sluice valve according to a conventional technique.

FIG. 7 is a cross-sectional view showing a check valve according to a conventional technique.

[Explanation of symbols]

 1 valve device 5 inner wall 7 valve seat 9 valve 10 one end 11 back side 18 operation rod 19 one end 23 link (connecting material) 24 first pin (first support shaft) 25 second pin (second support shaft) 39a, 39b, 39c Flow path 40 Flow direction 41 Parallel lines

Claims (3)

[Claims] 1. A valve seat, which is provided in a fluid flow path, and a valve element, one end of which is rotatably supported and which comes in contact with and separates from the valve seat, and blocks or regulates the flow of the fluid. In the valve device, the operating rod for rotating the valve element around the one end,
A connecting member that connects a first support shaft provided at one end on the flow path side of the operation rod and a second support shaft provided at a rear surface side opposite to a side of the valve element that contacts and separates from the valve seat. The operating rod and the connecting member and the connecting member and the valve element are rotatably provided on each of these two support shafts, and the valve is operated by moving the operating rod toward the flow path. When the child is rotated and brought into close contact with the valve seat, the first support shaft is opposite to the operation side of the operation rod with respect to a line passing through the second support shaft and parallel to the direction of the flow path. A valve device characterized by being located on the side of. 2. The valve device according to claim 1, wherein the operating rod moves in a direction perpendicular to the direction of the flow path. 3. The valve device according to claim 1 or 2, wherein the shape of the inner wall of the main body of the valve device facing the side where the operation rod is located is parallel to the direction of the flow path.