JP3406466B2 - Control valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve that controls the flow rate of fluid by opening and closing a plug by driving an operating device.

[0002]

2. Description of the Related Art FIG. 9 is a partial sectional side view showing a conventional control valve. In the figure, 1 is a plug as a valve for controlling the flow rate of a fluid to be passed, and 2 is a driving force transmitted to the plug 1. A valve shaft 3, a stem shaft 5 connected to the valve shaft 2 by a stem connector 4, a piston 5 connected to the stem shaft 3 and reciprocating up and down in a cylinder case 6, 7 an upper part of the cylinder case, 8 Is a screw screwed into the cylinder case upper part 7, 9 is a spring for urging the piston 5 downward in the drawing, 10 is a spring retainer,
Reference numeral 11 is an air inlet / outlet for letting air in and out of a space below the piston in the cylinder case 6, 12 is a yoke connecting and fixing the cylinder case 6 and the valve box 13, 13 is a valve box, and 14 is a valve seat. .

Next, the operation will be described. A downward biasing pressure is constantly applied to the upper surface of the piston 5 by the spring 9, and the downward biasing pressure applied to the piston 5 moves the plug 1 downwards via the stem shaft 3 and the valve shaft 2. Energize, which causes the valve to close.

The lower surface of the piston 5 also has an air inlet / outlet port 11
When compressed air is introduced and discharged from the valve, it receives an upward biasing pressure due to air pressure, and this upward biasing pressure biases the plug 1 upward via the stem shaft 3 and the valve shaft 2, whereby the valve is opened. open.

During operation of the control valve, the air pressure supplied from the air inlet / outlet 11 is adjusted to change the balance between the downward biasing pressure of the spring 9 and the upward biasing pressure of the air pressure. As a result, the plug 1 moves up and down to adjust the gap between the plug 1 and the valve seat 14, and the flow rate of the fluid is controlled.

In the initial state in which no air pressure is applied from the air inlet / outlet 11 and no upward biasing pressure is applied, the plug 1 is completely closed by the downward biasing pressure of the spring 9 and fluid leakage does not occur. Need to be In order to generate the initial pressure on the plug 1 as described above, the spring 9 needs to be in a state of being sufficiently compressed from its natural length. Therefore, at the time of assembly, the screw 8 screwed to the cylinder case upper portion 7 is installed. Is screwed in to lower the position of the spring retainer 10 and the spring 9 having a natural length is sufficiently compressed.

FIG. 10 is a side sectional view showing an upper portion of a conventional control valve having another structure. In the drawing, 15 is a first cylinder portion and 16 is a second cylinder portion. Note that the same or corresponding parts as those shown in FIG.

In the first conventional example, as shown in FIG. 9, the inner surface of the cylinder case 6 is shaved so that the inner diameter has a step, whereby the upward displacement of the piston 5 is restricted and the rise of the plug 1 is restricted. However, in the second conventional example, the second cylinder portion 16 having a diameter larger than that of the first cylinder portion 15 is provided as a separate member, and the piston 5 is attached to the inner diameter of the second cylinder portion 16. A stopper is formed by matching the diameters.

[0009]

Since the conventional control valve is constructed as described above, in order to sufficiently generate the initial pressure by the spring 9, the screw 8 is screwed into the spring retainer 10 during assembly. It was necessary to lower the position so that the spring 9 was sufficiently compressed. Therefore, since a space and a mechanism for giving an initial elastic force by the compression of the spring 9 are required, the structure becomes so tall that it is vulnerable to vibration, and there is a problem that the screw loosens during long-term use. There is a problem that the elastic force may not be maintained.

Further, depending on the use of the control valve, the initial elastic force set in the spring 9 reaches about 2 tons, and for rotating the screw 8 holding this, for example, 30 k is required.
An extremely large torque such as g-torque is required, and it is necessary to rotate the screw 8 with an extremely strong force even when the screw 8 is rotated by an oversized spanner. Therefore, there is a problem that a space for tightening the spring is required around the control valve in which a plurality of pipes and the like are arranged. Further, in order to perform assembly and maintenance, the screw 8 is generally required to have a strong force in a narrow space. There is a problem that it is necessary to perform extremely difficult work of rotating the spring 9 to compress and expand the spring 9 between the natural length and the initial length.

Furthermore, in order to give the spring 9 an initial elastic force, extra parts and materials such as the screw 8, the spring retainer 10 and the cylinder case upper portion 7 are required, which causes a problem of cost increase.

Further, when the inner surface of the cylinder case 6 is shaved to form the stopper of the piston 5, a very precise finish is required when the cutting is further advanced to form a portion having a large inner diameter that comes into contact with the piston 5. There is a problem that it is necessary and that the cutting work takes a long time.

Further, the piston 5 and the spring retainer 1
Since the spring 9 is arranged between 0, there is a problem that when the spring 9 expands and contracts repeatedly, the shaft rotates together with the piston 5 and the spring 9 may fall.

[0014] The present invention has been made to solve the above problems, other than the assembling site of the regulating valve a SaTsuyoshi to provide an initial elastic force to the elastic member, such as Sprint grayed assembling stage prior regulating valve Another object of the present invention is to obtain a control valve which can be carried out and which does not require the space and structure conventionally required for giving an elastic force to the elastic member and which has a short height and is strong against vibration.

[0015]

According to a first aspect of the present invention, there is provided a control valve according to the first aspect of the present invention, wherein the elastic member and the pressure-moving member, to which the initial elastic force is applied, are elastic member compression-holding members at a stage before being assembled into the cylinder case. assembled state of being held by, and the top cover or the silicon of the cylinder case
An elastic member unit having a bonnet forming a lower lid of the binder case and incorporated in the cylinder case is provided.
In addition, the elastic member compression holding member is the elastic member unit.
Lid of the cylinder case or the
And a connecting member that connects the pressure member and the pressing member .

[0016]

[0017]

[0018]

In the control valve according to the second aspect of the present invention, the connecting member is used without being removed even after the control valve is assembled, and the interval at which the connecting member connects the upper lid or bonnet in the elastic member unit and the pressure moving member is adjusted. It is adjustable from outside the valve.

In the control valve according to the third aspect of the present invention, the connecting member is used as a stopper for preventing the elastic member from being compressed beyond a certain limit when the elastic valve is compressed, without being removed. .

According to a fourth aspect of the present invention, there is provided a control valve, wherein a plurality of connecting members are provided so as to prevent rotation between the upper lid or bonnet of the elastic member unit and the pressure moving member. It is designed so that it can be used without removing it during operation.

The regulating valve according to the invention of claim 5 wherein is provided with a spring as the elastic member, the connecting member is obtained by a plurality in the form along the inner circumference or the outer circumference of the spring.

According to a sixth aspect of the present invention, there is provided a control valve, wherein the elastic member side of the pressure member contacts the upper lid or the bonnet of the elastic member unit when the elastic member is compressed to compress the elastic member beyond a certain limit. A stopper member is provided to prevent this.

[0024]

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. Embodiment 1. 1 is a partial cross-sectional view showing a control valve according to a first embodiment of the present invention, (a) is a case unit of the control valve according to the first embodiment, and (b) is a first embodiment.
The spring unit of the control valve according to (1), (c) shows the state immediately after the spring unit is assembled to the case unit, and (d) shows the completed state.

In the figure, 20 is a case unit and 30
Is a spring unit (elastic member unit), and in the case unit 20, 21 is a cylinder case, 2
Reference numeral 2 denotes a bonnet that forms a lower lid of the cylinder case 21 and connects and fixes the yoke 12 and the cylinder case 21.
In the first embodiment, the air inlet / outlet 11 similar to the conventional example is provided. 23 and 24 are cylinder cases 2
They are bolts and nuts for fixing 1 and the bonnet 22.

In the spring unit 30, 3 is a stem shaft (a shaft connected to a plug), 5 is a piston (pressing member), and 9 is a spring (elastic member), which are the same as conventional ones. Reference numeral 31 is an upper lid for pressing the spring 9 from above, 32 is a connecting member (elastic member compression holding member) for connecting the upper lid 31 and the piston 5 within a predetermined distance, 3
3 is a nut for the connecting member 32 (elastic member compression holding member)
Is. Further, 34 and 35 are bolts and nuts for attaching the upper lid 31 to the cylinder case 21.

The valve box 13 having the valve seat 14 is connected and fixed to the yoke 12, and the valve shaft 2 and the plug 1 are connected to the stem shaft 3 as in the conventional example. The description is omitted.

Further, in the case unit 20 of FIG. 1, the yoke 12 and the bonnet 22 are integrally molded, but the yoke 12 and the bonnet 22 may be provided separately and fixed by bolts / nuts or welding. . Further, the cylinder case 21 and the bonnet 22 are attached by a plurality of bolts 23 and nuts 24, but they may be welded or integrally molded.

Next, the operation will be described. In assembling the spring unit 30, first, the spring 9 is arranged between the piston 5 and the upper lid 31, and then the upper lid 31 and the piston 5 are compressed from above and below in the drawing by a compression device such as a press machine so that the spring 9 naturally extends. It is further compressed to have an initial elastic force, and in this state, the upper lid 31 and the piston 5 are connected by the connecting member 32 and the nut 33. Figure 1 (b)
In the connecting method shown in FIG. 3, the connecting member 32 having a thread at the lower end in the drawing is screwed into the piston 5 to
The nut 33 is screwed into the screw cut at the upper end in FIG. In the configuration shown in FIG. 1, the connecting member 32
Is provided on the circumference of the upper lid 31, so that a jig having a shape that presses the inside of the circumference of the upper lid 31 is arranged between the compression apparatus and the compression apparatus when the compression is performed by the compression apparatus. Perform compression. The above is the elastic member unit assembling process of assembling the spring unit 30 as the elastic member unit.

When the spring unit 30 is assembled to the case unit 20, first, the spring unit 30 assembled as described above is inserted from above the case unit 20, and then the upper lid 31 and the cylinder case 21. Are fixed by bolts 34 and nuts 35 as shown in FIG. The above is the elastic member unit assembling process.

Then, in the first embodiment, the connecting member 32 is removed, and the hole for the connecting member 32 opened in the upper lid 31 is evacuated (for example, the actual opening 63-1321).
Bleed hole cap described in No. 79) or a screw. In FIG. 1D, 36 is a bleed hole cap, and 37 is a screw. When the hole of the upper lid 31 is completely covered with a screw or the like, an air vent may be separately provided on the side surface of the cylinder case 21.

Next, the normal operation of the control valve will be described. A downward biasing pressure is constantly applied to the upper surface of the piston 5 by the spring 9, and the downward biasing pressure applied to the piston 5 is applied to the plug 1 via the stem shaft 3 and the valve shaft 2.
Is urged downwards, which causes the valve to close.
The lower surface of the piston 5 is also subjected to upward biasing pressure due to air pressure by letting in / out compressed air from the air inlet / outlet 11, and this upward biasing pressure is applied to the stem shaft 3 and the valve shaft 2.
The plug 1 is urged upwards via, which opens the valve. During the operation of the control valve, by adjusting the air pressure supplied from the air inlet / outlet 11, the balance between the downward urging pressure by the spring 9 and the upward urging pressure by the air pressure is changed. The plug 1 moves up and down to adjust the gap between the plug 1 and the valve seat 14 to control the flow rate of the fluid.

In the initial state where the air pressure from the air inlet / outlet 11 is not applied and the upward biasing pressure is not applied, the downward biasing pressure of the spring 9 causes the plug 1 to be completely closed and no fluid leakage occurs. Although it is necessary, the initial elastic force of the spring 9 which is the source of the initial pressure on the plug 1 is obtained before the assembly by the compression of the spring 9 by the compression device in the elastic member unit assembling process. When assembling, it is necessary to use a large wrench to screw in the screw screwed to the upper part of the cylinder case with a strong force in order to keep the spring 9 sufficiently compressed from its natural length. Absent.

At the time of disassembly and maintenance, first, the upper lid 31 and the piston 5 are connected by the connecting member 32 and the nut 33, which have been removed, and then the bolt 34.
After removing the nut 35 and the nut 35 to release the connection between the upper lid 31 and the cylinder case 21, the spring unit 30
Remove.

As described above, according to the first embodiment, the work of applying the initial elastic force to the spring 9 can be performed using the compression device or the like before the assembling of the control valve, and the spring 9 can be operated. In order to give the initial elastic force, it is not necessary to perform a hard work of screwing the screw with a large force using a large wrench at the site where the control valve is assembled. This eliminates the need for a work space that was previously required around the control valve where multiple pipes are arranged.In addition, during assembly and maintenance, screws or the like can be used with a strong force in a narrow space. Rotate and spring 9
There is an effect that it is not necessary to perform an extremely difficult work of compressing and expanding between the natural length and the initial length. Further, the space and structure conventionally required for applying the elastic force to the spring 9 at the upper part of the control valve can be eliminated, and the height of the control valve can be reduced, and the control valve can be strong against vibration. . Further, it is possible to reduce costs by eliminating the need for structural materials such as screws and spring retainers, which are conventionally required, and prevent the situation where the screws loosen and the elastic force of the spring 9 cannot be maintained during long-term use. There is an effect that can be.

The spring 9 formed by the above-mentioned compression device is used.
The compression may be performed in advance in a control valve production plant or the like as described above, but may be performed in the vicinity of the assembly site using compressed air that is usually easily obtained at the assembly site such as a complex.

Embodiment 2. 2 is a partial cross-sectional view showing a control valve according to Embodiment 2 of the present invention. In the figure, 39 is a cylindrical lift stopper (stopper member) fixed to the piston 5. It should be noted that the same or corresponding parts as those shown in FIG. Also, since the second embodiment is the same as the first embodiment except that the lift stopper 39 is provided, duplicated description of the assembly, operation, and the like will be omitted.

The lift stopper 39 prevents excessive compression of the spring 9 and excessive rise of the piston 5 by coming into contact with the upper lid 31 when the spring 9 excessively compresses and the piston 5 excessively rises. , Spring 9
Since it is formed along the inner periphery of the spring 9, it serves as a guide for the spring 9 and prevents the spring 9 from slipping or falling.

According to this embodiment, the air inlet / outlet port 11
It is possible to prevent the piston 5 from rising above a certain limit when air pressure is applied from above to raise the piston 5, and it is possible to prevent the valve box 13 from being broken due to the excessive rise of the plug 1, and at the same time, to prevent the spring 9 from moving. It is possible to prevent misalignment and fall.

Embodiment 3. 3 is a partial cross-sectional view showing a control valve according to Embodiment 3 of the present invention. In the figure, 21a is an annular plate member welded to the upper portion of a cylinder case 21, and 40 is the same as in Embodiments 1 and 2 above. Like the upper lid 31, it is an upper lid that does not go out of the cylinder case 21 and enters the cylinder case 21, 41 is an initial tightening jig (elastic member compression holding member), and 42 is a nut (elastic member compression holding member). At the lower end of the tightening jig 41, there is a screwing portion 41a that is screwed with a screw formed on the upper surface of the piston 5.
Is formed, and a screw that is screwed into the nut 42 is cut at the upper end of the initial tightening jig 41. The same or corresponding portions as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and the duplicate description will be omitted.

Next, the operation will be described. Like the first and second embodiments, the spring unit 30 is assembled by applying the initial elastic force to the spring 9, but in the third embodiment, the piston 5 and the upper lid after the spring 9 is compressed. 40 with the upper lid 40
And one initial tightening jig 41 and nut 42 located at the center of the piston 5. In assembling the spring unit 30, first, the upper lid 40 with the spring 9 disposed therebetween and the piston 5 are compressed by a compression device to give an initial elastic force to the spring 9, and then the central portion of the upper lid 40 is placed. The lower end of the initial tightening jig 41 that has passed through the formed hole is screwed into the piston 5, and the nut 42 is screwed onto the upper end of the initial tightening jig 41, whereby the piston 5 and the upper lid 40 are connected. To connect.

Further, unlike the case unit 20 in the first and second embodiments, the cylinder case 21 is not attached to the yoke 12 and the bonnet 22 at first, and the spring unit 30 is assembled as described above. The stem shaft 3 of the spring unit 30 assembled to the yoke 12 and the hood 2
Then, the cylinder case 21 to which the annular plate member 21a is welded is covered from above, and then the cylinder case 21 and the bonnet 22 are connected by bolts 23 and nuts 24.

After the above assembling, the initial tightening jig 41 is removed, and the hole for the initial tightening jig 41 opened in the upper lid 40 is formed in the same manner as in the first and second embodiments. The air is removed with 36 or the like, and it is closed with a screw 37 or the like.

Also in the third embodiment, the same effect as in the first and second embodiments can be obtained.

Incidentally, in order to prevent rainwater accumulated in the upper part of the control valve from entering, a sealing material may be provided at a contact portion between the annular plate member 21a and the upper lid 40. Further, the compression of the spring 9 performed before the assembling of the spring unit 30 may be performed by tightening the nut 42 with respect to the initial tightening jig 41 without using the compression device. Since the tightening can be performed at a place other than the place where the control valve is installed, the work of applying the initial elastic force to the spring 9 becomes easier as compared with the conventional example.

Fourth Embodiment 4A and 4B are partial cross-sectional views showing a control valve according to a fourth embodiment of the present invention. FIG. 4A is a case unit of the control valve according to the fourth embodiment, and FIG. 4B is a control valve according to the fourth embodiment. The spring unit,
(C) shows the state immediately after assembling the spring unit to the case unit.

In the first to third embodiments, the reverse operation type control valve in which the piston 5 rises and the plug 1 rises when air is introduced from the air inlet / outlet 11, has been described. 1 shows an example of a positive-acting control valve in which the piston 5 descends and the plug 1 descends when air is introduced from the air inlet / outlet 11. In the figure, 20 is a case unit, 30 is a spring unit, 3 is a stem shaft, 5 is a piston, 9 is a spring, 11 is an air inlet / outlet, 12 is a yoke, 21 is a cylinder case, 22 is a bonnet, 2
Reference numeral 3 is a bolt, 24 is a nut, 31 is an upper lid, 32 is a connecting member, and 33 is a nut, which are equivalent to the parts for reverse operation in the first to third embodiments except that they are parts for normal operation. belongs to. Note that, unlike the above-described respective embodiments, the upper lid 31 is provided as a part of the case unit 20 from the beginning by the bolt 34 and the nut 35, and the cylinder case 2
1, the bonnet 22 is a part of the spring unit 30, and the air inlet / outlet 11
Is provided not on the hood 22 but on the upper lid 31.

Next, the operation will be described. In the assembly of the direct-acting type control valve shown in FIG. 4, first, the spring 9 is arranged between the bonnet 22 and the piston 5, and the compression between the bonnet 22 and the piston 5 is performed using a compression device or the like. 9 is contracted until it has an initial elastic force, and in this state, the bonnet 22 and the piston 5 are connected by the connecting member 32 and the nut 33 to complete the assembly of the spring unit 30. Then, the bonnet 22 of the spring unit 30 and the yoke 12 are fixed by fixing means such as bolts and nuts, and finally, the cylinder case 21 is covered from above and joined to the bonnet 22 by bolts 23 and nuts 24. After the above assembling, the connecting member 32 is removed, and the bonnet 2
The hole for the connecting member 32 opened in 2 is closed with a screw 37 or the like. Note that FIG. 5 is an exploded view showing details of the configuration of the control valve of the fourth embodiment.

As described above, according to the fourth embodiment, in the normally operated control valve, the initial elastic force required for the spring 9 can be applied to another place before the control valve is installed. It is possible to obtain a positively-acting control valve having the same effect as that of the first embodiment.

Embodiment 5. 6 is a partial sectional view showing a control valve according to a fifth embodiment of the present invention, in which 50 is a connecting member (elastic member compression holding member), 50a.
Is a stopper position provided on the connecting member 50, and the connecting member 50 is formed to have a larger diameter below the stopper position 50a. It should be noted that the same or corresponding parts as those shown in FIG.

The control valve according to the fifth embodiment is a reverse-acting control valve which is substantially the same as the control valve according to the first embodiment shown in FIG. 1, except that the control valve on the circumference around the upper lid 31 and the piston 5 is the same. A plurality of connecting members 50 provided on the piston 5 are used without being removed during operation of the control valve.
Used as a lift stopper for.

Next, the operation will be described. The work up to the assembling of the spring unit 30 and the assembling of the spring unit 30 to the case unit 20 are the same as the work described in the first embodiment.

When the piston 5 rises during the operation of the control valve, the connecting member 50 slides with respect to the upper lid 31, but further stopping of the connecting member 50 is stopped at the stopper position 50a. The connecting member 50 serves as a stopper that limits the upward movement of the piston 5 with respect to the upper lid 31. Further, by using a plurality of connecting members 50 provided on the circumference around the upper lid 31 and the piston 5 without removing them, rotation of the piston 5 and the stem shaft 3 due to repeated expansion and contraction of the spring 9 is prevented. You can

As described above, according to the fifth embodiment, by using the connecting member 50 provided with the stopper position 50a without removing it, in addition to the effect of the first embodiment, the lift stopper for the piston 5 is obtained. And a control valve provided with a rotation stop.

In FIG. 6, the stopper position 50a is formed by forming the diameter of the connecting member 50 in two steps, that is, the size above and below the stopper position 50a.
It goes without saying that any other shape may be used as long as the sliding of the No. 0 upper lid 31 is restricted.

Sixth Embodiment FIG. 7 is a partial cross-sectional view showing a control valve according to Embodiment 6 of the present invention. In the figure, 21-1 is a first cylinder case, 21-2 is a second cylinder case, and 60 is an inside of a spring 9. A plurality of connecting members (elastic member compression / holding members) installed substantially in contact with each other, 61 a plurality of spring guides installed in positions substantially contacting the outside of the spring 9, 62 an upper cover fixing member for fixing the upper cover 40, and 63 a bolt , 64 are nuts. Note that the same or corresponding portions as those shown in FIG. 3 are designated by the same reference numerals, and redundant description will be omitted.

In the sixth embodiment, by using the first cylinder case 21-1 having a small diameter and the second cylinder case 21-2 having a large diameter as cylinder cases, the piston 5 can be lifted above a certain limit. In addition, a lift stopper is formed to prevent it, and the coupling member 60 located inside the spring 9 is left without being removed so as to serve as a spring guide from the inside and to prevent rotation, and a spring guide shorter than the coupling member 60 is formed. By providing 61 on the outside of the spring 9, the displacement of the spring 9
Prevents falls. In addition, in this embodiment, the second cylinder case 21-2 and the bonnet 22 are integrally formed.

Next, the operation will be described. First, the spring 9 is arranged between the piston 5 to which the spring guide 61 is attached in advance and the upper lid 40, and the space between the upper lid 40 and the piston 5 is compressed by the compression device to give the spring 9 an initial elastic force. Then, the piston 5 and the upper lid 40 are connected by the connecting member 60 and the nut 33.

An upper lid fixing member 62 is attached to the upper lid 40 of the spring unit 30 assembled as described above by welding or the like in advance or at the assembly site of the control valve, and the first cylinder case 21-1 is made of a sealing material. It is attached via.

The spring unit 30 assembled as described above is inserted into the second cylinder case 21-2 integrated with the bonnet 22 from above in the drawing, and then, the lower flange portion of the first cylinder case 21-1 and the flange portion. The second cylinder case 21-2 is tightened and fixed by the bolt 63,
Next, the bolt 63 and the upper lid fixing member 62 are attached to the nut 6
It is fixed by 4, and the assembly is completed. In the figure, the bolt 63 and the nut 64 are the upper lid fixing member 62.
Since it is provided at an odd number of places such as three places on the circumference of the circle, it is shown only on the left side in the figure.

During operation of the control valve, the spring 9
Is guided by the connecting member 60 and the spring guide 61, so that the spring 9 is prevented from being displaced / fallen down. Also, due to the difference in diameter between the first cylinder case 21-1 and the second cylinder case 21-2, the piston 5 is excessively moved. Is prevented from rising.

As described above, according to the sixth embodiment, the same effect as that of the first embodiment can be obtained in the control valve having the structure in which the stoppers of the piston and the plug are formed by the two cylinder cases having different diameters. Obtainable.

It should be noted that the spring 9 is stably arranged by interposing a disc-shaped or plate-shaped spring holder or the like between the upper lid 40 and the spring 9 or between the piston 5 and the spring 9, and further elastic force is applied to the spring 9. It may be provided.

Embodiment 7. FIG. 8 is a partial cross-sectional view showing a control valve according to a seventh embodiment of the present invention. In the figure, 70 is engaged with the stem shaft 3 and the stem shaft 3 can be manually moved up and down by rotating. It is a possible manual hand manual. It should be noted that the same or corresponding parts as those shown in FIG.

The control valve of the seventh embodiment is capable of forcibly moving the stem shaft 3 up and down to open and close the plug 1 by operating the manual hand manual 70 at the time of failure or emergency. .

Embodiment 8. In the seventh embodiment, the control valve in which the manual hand manual 70 is attached to forcefully open and close the plug 1 is shown. However, in addition to the manual hand manual 70 being attached separately, the adjustment valve is shown in FIG. In the third embodiment, the jig 41 for initial tightening as one connecting member arranged at the center is provided.
The same function can be provided by using the nut 42 of the initial tightening jig 41, which is left without being removed after the assembling. In the event of a failure or emergency, the nut 5 of the initial tightening jig 41 can be forcibly moved up and down by tightening or loosening the nut 42 of the jig 41 for opening and closing the plug 1 by force. .

Further, unlike the fifth embodiment shown in FIG. 6 and the sixth embodiment shown in FIG. 7, the connecting member is not removed even after assembly, and the connecting member is protruding from the upper lid. When it is operable, the piston 5 can be forcibly moved up and down to forcibly open and close the plug 1 by rotating the nut 33 of the connecting member or the like.

In each of the above-described embodiments, the control valve using the piston 5 as the pressure moving member that receives the elastic member and the urging pressure by the air pressure is shown on both sides, but a diaphragm or the like is used as the pressure moving member. The present invention can be applied to a control valve using another pressure moving member, and the present invention can also be applied to a control valve including an elastic member other than the spring 9 as an elastic member. Needless to say.

[0070]

As described above, according to the first aspect of the present invention, the elastic member and the pressure-moving member to which the initial elastic force is applied are compressed and held by the elastic member in the stage before being assembled into the cylinder case. Assembled in a state of being held by a member, and the upper lid of the cylinder case or the
An elastic member unit that has a bonnet that forms a lower lid of a cylinder case and is incorporated into the cylinder case is provided , and the elastic member compression holding member is the elastic member.
The top cover of the cylinder case or the bon in the unit
Since it has a connecting member for connecting the net and the pressure member, it is possible to perform the work of applying the initial elastic force to the elastic member by using a compression device or the like before the control valve is installed. There is an effect that it is not necessary to perform a hard work of screwing a screw with a large force using a large wrench at the assembly site of the control valve in order to give an initial elastic force to the member. This eliminates the need for a space for assembly around the control valve where multiple pipes are installed, and requires a strong force such as a screw in a narrow space during assembly and maintenance. There is an effect that it is not necessary to perform extremely hard work of rotating and compressing and expanding the elastic member between the natural length and the initial length. Further, since the space and structure conventionally required for giving the elastic force to the elastic member above the control valve are unnecessary, the height of the control valve can be shortened, and the control valve can be strong against vibration. effective. Furthermore, it is possible to reduce costs by binding structural materials such as screws and spring retainers, which have been required in the past, and to prevent the elastic force of elastic members from being lost due to loosening of screws during long-term use. There is an effect that can be prevented.

[0071]

[0072]

[0073]

According to the second aspect of the present invention, the connecting member is used without being removed even after the control valve is assembled, and the connecting member connects the upper lid or the bonnet in the elastic member unit with the interval of the control valve. Since it is configured to be adjustable from the outside, in the event of a failure or emergency, the connection interval of the connecting members can be adjusted from the outside of the control valve to forcibly move the pressure member up and down to forcibly open and close the plug. There is an effect that it can be used as a control valve.

According to the third aspect of the invention, the connecting member is not removed even when the control valve is operating, and is used as a stopper for preventing the elastic member from being compressed beyond a certain limit when it is compressed. A stopper that prevents movement of the pressure member and the plug beyond a certain limit without the need for extremely precise and time-consuming cutting or finishing such as forming the stopper of the pressure member by cutting the inner surface of the connecting member. It is possible to prevent the valve box from being broken due to excessive movement of the plug.

According to the invention as set forth in claim 4 , a plurality of connecting members are provided in such a shape as to prevent rotation between the upper lid or bonnet in the elastic member unit and the pressure moving member, and the connecting members operate the control valve. Since it is configured to be used without being removed even when the elastic member is repeatedly expanded and contracted, the connecting member can prevent the pressure member such as the piston and the shaft from rotating.

According to the invention of claim 5 , a spring is provided as the elastic member, and a plurality of connecting members are provided along the inner circumference or the outer circumference of the spring. It is possible to prevent the spring from slipping and falling by adding the function of.

According to the sixth aspect of the present invention, the elastic member side of the pressure member is brought into contact with the upper lid or the bonnet in the elastic member unit when the elastic member is compressed to prevent the elastic member from being compressed beyond a certain limit. Since it is configured to provide the stopper member, it is possible to use a simple configuration without the need for extremely precise and time-consuming cutting work or finishing such as shaving the inner surface of the cylinder case to configure the stopper of the pressure motion member.
It is possible to form a stopper that prevents the pressing member and the plug from moving beyond a certain limit, and it is possible to prevent the valve box from being broken due to excessive movement of the plug.

[0079]

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a control valve according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a control valve according to Embodiment 2 of the present invention.

FIG. 3 is a partial sectional view showing a control valve according to a third embodiment of the present invention.

FIG. 4 is a partial sectional view showing a control valve according to Embodiment 4 of the present invention.

FIG. 5 is an exploded view showing details of the configuration of the control valve according to the fourth embodiment of the present invention.

FIG. 6 is a partial sectional view showing a control valve according to Embodiment 5 of the present invention.

FIG. 7 is a partial sectional view showing a control valve according to Embodiment 6 of the present invention.

FIG. 8 is a partial sectional view showing a control valve according to a seventh embodiment of the present invention.

FIG. 9 is a partial cross-sectional side view showing a conventional control valve.

FIG. 10 is a side sectional view showing an upper portion of a conventional control valve having another configuration.

[Explanation of symbols]

1 plug 3 Stem shaft (shaft connected to the plug) 5 Piston (pressure member) 9 Spring (elastic member) 21 cylinder case 22 Bonnet 30 Spring unit (elastic member unit) 31 Top cover 32, 50, 60 Connecting member (elastic member compression holding member) 33,42 Nut (elastic member compression holding member) 39 Lift stopper (stopper member) 41 Initial tightening jig (elastic member compression holding member)

Claims (6)

(57) [Claims] 1. A drive shaft is connected to a shaft connected to a plug and receives repulsive pressure from an elastic member on one side and pneumatic pressure on the other side to reciprocate in a cylinder case to drive to the plug. transmit forces, the control valve having a圧動member to adjust the gap between the plug and the valve seat, the incorporation previous stage to the cylinder casing,
The elastic member and the pressure member to which the initial elastic force is applied are assembled in a state of being held by the elastic member compression holding member, and the upper lid or the cylinder of the cylinder case is assembled.
An elastic member unit having a bonnet forming a lower lid of the case and incorporated into the cylinder case is provided .
The elastic member compression holding member is the elastic member unit.
With the upper lid of the cylinder case or the bonnet inside
A control valve having a connecting member for connecting the pressure member . 2. The connecting member is used without being removed even after the control valve is assembled, and the connecting member can adjust the interval for connecting the upper lid or bonnet in the elastic member unit and the pressure member from the outside of the adjusting valve. regulating valve according to claim 1, wherein. 3. A without removing even during operation of the regulating valve the coupling member, the control valve according to claim 1, characterized by using as a stopper to prevent certain limit further compression during compression of the resilient member. 4. A plurality of connecting members are provided so as to prevent rotation between the upper lid or bonnet of the elastic member unit and the pressure member, and the connecting members are used without being removed even during operation of the control valve. regulating valve according to claim 1, wherein. 5. comprising a spring as an elastic member, coupling member control valve according to claim 1, wherein the provided plurality in the form along the inner circumference or the outer circumference of the spring. 6. A stopper member is provided on the elastic member side of the pressure member so as to prevent the elastic member from being compressed beyond a certain limit by coming into contact with an upper lid or a bonnet in the elastic member unit when the elastic member is compressed. The control valve according to claim 1.