JP3095972U - Seal gas pressure regulating valve device in tank - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention relates to a seal gas pressure regulating valve device.
It controls the pressure of the seal gas that covers the liquid surface of chemical liquids, petroleum-based liquids, etc. in the tank, simplifies the work of installing the pressure reducing valve, and saves time and labor required for laying work and improves work efficiency. To improve. SOLUTION: First and second moving main valves 5 for opening and closing communication passages 4 on an inlet 2 side and an outlet 3 side of a seal gas G are provided.
, A first pressure chamber 10 communicating with a bypass 9, a second pressure chamber 12 opened and closed by a needle valve 11, and a gas flow path 1 through a third diaphragm 16.
The primary pressure supplied from the inlet 2 side to the main body portion 20 of the seal gas pressure regulating valve device having the third pressure chamber 18 accommodating the pilot valve 14 capable of opening and closing the pilot valve 14 is adjusted to the critical strength pressure of the valve function. The pressure reducing valve 21 for reducing the pressure is integrated.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention relates to a seal gas pressure regulating valve device, especially for a chemical stored in a tank. The pressure of the seal gas that covers the liquid surface of various liquids, chemicals, petroleum-based liquids, pure water, etc. is controlled. Used for

[0002]

[Prior art]

  In particular, the liquid level of chemical liquids, chemicals, petroleum-based liquids, etc. stored in tanks From the viewpoint of shutting off the active gas as an object, the liquid surface is protected by a seal gas such as an inert gas. It is covered so as to prevent alteration of the liquid. In addition, the contents stored in the tank If the water is pure water, it is prevented from deteriorating and deteriorating by touching dust or air. Similarly, from the viewpoint of stopping, the liquid surface was covered with gas. In this case, the sealing gas Considering the pressure resistance of the tank, the gas pressure must be kept slightly higher than atmospheric pressure and kept constant. is there.

[0003]   And, the tank increases and decreases the air layer due to receiving and discharging of liquid, and Increase / decrease in air and steam accompanying up / down movement, and large internal pressure in the tank during an emergency such as a fire. The internal pressure of the seal gas in the tank is automatically controlled using the gas pressure control valve in consideration of changes. I am trying to control it.

[0004]   Optimal as a seal gas pressure control valve device in the tank used for such automatic control We have presented such a thing first. The seal gas pressure control valve device in this tank is The main valve that opens and closes the communication passage on the inlet side and the outlet side of the seal gas in the It is attached to the valve rod of the in-valve, and the size of the pressure receiving area of the gas flowing in from the inlet can be adjusted. The first diaphragm that allows the main valve to move and is released to the atmosphere. The second diaphragm that is open, and the seal in the tank from the inlet side through a bypass. The first pressure chamber to which the rugas is supplied and the first diaphragm, A second seal gas is supplied from the inlet side by opening and closing the needle valve. Open and close a pressure chamber and a gas flow path formed between the second pressure chamber and the outlet side. A pilot valve and a third valve connected to the pilot valve via a connecting rod. Seals the inside of the tank by accommodating the ear diaphragm and defining the inside of the diaphragm. Gas can flow in through the pressure sensitive tube, and when the pressure drops, the third diaphragm A third valve that stores the pilot valve in the gas flow path so that it can be opened and closed by operating And a pressure chamber of (for example, Japanese Utility Model Publication No. 4-13513).

[0005]   And when the internal pressure in the tank is constant, the pressure gas entering from the inlet side The first pressure chamber is reached through the bypass, and the second pressure chamber is pressurized via the needle valve. Since the force gas is contained, the first pressure chamber and the second pressure chamber have the same pressure. However, since the outside of the second diaphragm is open to the atmosphere, The main valve works in the direction to close by the output of the diaphragm. Also Since the internal pressure of the third pressure chamber is the same as the internal pressure of the tank due to the pressure sensitive pipe, The gas passage is closed by the pilot valve.

[0006]   In this way, when the internal pressure in the tank drops, the third diaphragm pushes up. The pilot valve is actuated and the gas flow path is opened via the connecting means. Therefore, the gas in the second pressure chamber is discharged from the outlet side and enters the tank. At this time , The pressure gas is supplied to the second pressure chamber from the inlet side, but by the needle valve, Its supply is regulated. Therefore, the pressure in the second pressure chamber gradually drops, Due to the pressure difference between the first pressure chamber and the second pressure chamber, the main valve moves in the opening direction and is connected. A large amount of pressure gas is supplied by opening the passage and connecting the inlet and outlet. It is like this.

[0007]

[Problems to be solved by the device]

  However, the above-mentioned conventional seal gas pressure adjusting valve device in the tank is And a first diaphragm and a second diaphragm attached to the valve rod of this main valve. Since the strength with the earflam is designed to be about 0.4 MPa, the seal gas Since the primary pressure can handle only 0.4 MPa with a single pressure control valve, 0.4 When using a pressure exceeding MPa, piping on the inlet side of the seal gas pressure control valve A pressure reducing valve manufactured separately from this seal gas pressure adjusting valve must be installed in front of If it is not possible to use it, it will take a lot of time and labor to install the pressure reducing valve, The work efficiency in the construction was low, and the construction cost was also high. Moreover, the number of parts As a result, the equipment cost has tended to increase as the number of facilities increases.

[0008]   The present invention solves the above-mentioned conventional inconvenience, and installs a pressure reducing valve in front of the piping on the inlet side. Installation work can be omitted, time and labor required for laying work can be saved, and work efficiency can be improved. In addition, the number of parts is reduced to facilitate manufacturing and assembly, and construction and equipment costs are low. Aim to try to cost.

[0009]

[Means for Solving the Problems]

  In view of the above problems, the present invention provides a seal gas in a tank. Main valve that opens and closes a communication passage on the inlet side and the outlet side of the valve, and a valve rod of the main valve. Installed on the main valve depending on the size of the pressure receiving area of the gas flowing from the inlet. First diaphragm that allows the air to move and a second diaphragm released to the atmosphere And the first seal gas in the tank is supplied from the inlet side through a bypass. Opening and closing the needle valve, which is partitioned by the first pressure chamber and the first diaphragm. And a second pressure chamber to which a sealing gas is supplied from the inlet side by And a pilot valve for opening and closing a gas flow path formed between the outlet side and the outlet side, The third diaphragm connected to the pilot valve via the connecting rod is housed, The interior of the ear diaphragm is partitioned to allow the seal gas in the tank to flow in via the pressure-sensitive pipe. When the pressure drops, the third diaphragm operates and the A tank equipped with a third pressure chamber that houses an ilot valve in the gas flow path so that it can be opened and closed. A seal gas pressure adjusting valve device inside, the main body of the gas seal pressure adjusting valve device The primary pressure supplied from the inlet side to the gas seal pressure adjusting valve device. A pressure reducing valve for reducing the pressure to the limit strength of the valve function is integrated. The feature is adopted.

[0010]   According to a second aspect of the present invention, in the first aspect, the pressure reducing valve portion is A valve case provided in a portion for supplying the primary pressure supplied from the inlet side of the main body, It is attached to a rod located at the center of the valve case and reciprocates vertically in the valve case. A guide and a regulator disk, which are movably accommodated in a disk shape, and the guide Pressure regulating spring installed on the upper surface of the id It is characterized in that it is formed by a cushioning spring mounted on the surface. Adopted means.

[0011]

[Embodiment of device]

  An embodiment of the present invention will be described below with reference to the drawings.   1 is a longitudinal sectional view showing an embodiment of the seal gas pressure regulating valve device of the present invention, FIG. Is a horizontal sectional view, FIG. 3 is a right side view, and FIG. 4 is a sectional view of the pressure reducing valve portion constituting the present embodiment. Is.   In the figure, the communication passage 4 on the inlet 2 side and the outlet 3 side of the seal gas G in the tank 1 is opened. The main valve 5 to be closed and the valve rod 6 of the main valve 5 are attached to the inlet 2 The main valve 5 can be moved depending on the size of the pressure receiving area of the seal gas G to be entered. A first diaphragm 7 and a second diaphragm 8 open to the atmosphere, First, the seal gas G in the tank 1 is supplied from the entry port 2 side through the bypass 9. Of the pressure chamber 10 and the first diaphragm 7 to open the needle valve 11 The second pressure chamber 12 to which the seal gas G is supplied from the inlet 2 side when closed And opening and closing the gas flow path 13 formed between the second pressure chamber 12 and the outlet 3 side. Connected to the pilot valve 14 via a connecting rod 15. The connected third diaphragm 16 is housed, and the inside of the diaphragm 16 is partitioned. After being formed, the seal gas G in the tank 1 can flow in through the pressure sensitive pipe 17, When the third diaphragm 16 is actuated when lowered, the pilot valve And a third pressure chamber 18 in which the valve 14 is openably and closably housed in the gas flow path 13. Is the same as that of the conventional seal gas pressure adjusting valve device in the tank. Na Incidentally, FIG. 19 shows a pressure adjusting spring.

[0012]   However, in the seal gas pressure adjusting valve device in the tank 1 of this embodiment, Is supplied to the main body 20 of the seal gas pressure regulating valve device from the inlet 2 side. Reduce the secondary pressure to the critical strength pressure of the valve function of the seal gas pressure regulating valve device A pressure reducing valve 21 for doing so is integrally incorporated.

[0013]   The pressure reducing valve 21 is provided on the primary side supplied from the inlet 2 side of the main body 20. The valve case 22 provided at the pressure supply portion and the center of the valve case 22 inside the valve case 22. It is attached to the head 23 and is housed in the valve case 22 so as to be vertically reciprocable. Disc-shaped guide 24 and regulator disc 25, and the upper surface of the guide 24 Spring 26 for adjusting pressure interposed in the lower surface of the regulator disc 25 It is formed by a buffer spring 27 attached to the.

[0014]   The embodiment of the seal gas pressure adjusting valve device in the tank of the present invention is as described above. When the internal pressure in the tank 1 is constant, The seal gas G entering from the inlet 2 side reaches the first pressure chamber 10 through the bypass 9. Since the second pressure chamber 12 contains pressure gas through the needle valve 11, The first pressure chamber 10 and the second pressure chamber 12 have the same pressure. However, the second da Since the outside of the ear diaphragm 8 is open to the atmosphere, the second diaphragm 8 is The main valve 5 acts in the closing direction by the amount of the output. Also, the third pressure Since the internal pressure of the chamber 18 is the same as the internal pressure of the tank 1 due to the pressure-sensitive pipe 17, The gas passage 13 is closed by the ilot valve 14.

[0015]   Thus, when the internal pressure in the tank 1 drops, the third diaphragm 16 pushes up. Therefore, the pilot valve 14 is operated via the connecting means (connecting rod 15). Since the gas flow path 13 is opened, the gas in the second pressure chamber 12 is discharged from the outlet 3 side. It is done and it enters in the tank 1. At this time, the inside of the second pressure chamber 12 is sealed from the inlet 2 side. Although the rugas G is supplied, the supply amount is regulated by the needle valve 11. Therefore, the pressure in the second pressure chamber 12 gradually drops, and the pressure in the first pressure chamber 10 and the second pressure chamber 10 decreases. Due to the pressure difference in the pressure chamber 12, the main valve 5 moves in the opening direction and the communication passage 4 is opened. The point that a large amount of pressure gas is supplied due to the communication between the inlet 2 and the outlet 3 is as described above. The operation is similar to that of the conventional seal gas pressure adjusting valve device in the tank.

[0016]   However, in the seal gas pressure adjusting valve device in the tank of the present embodiment, The primary gas supplied from the inlet 2 side to the main body 20 of the seal gas pressure regulating valve device. The side pressure is reduced to the critical strength pressure of the valve function in the seal gas pressure regulating valve device. Since the pressure reducing valve 21 for the Unlike the valve regulator, this seal gas is placed in front of the piping on the inlet 2 side of the seal gas pressure regulating valve. Laying that a pressure reducing valve manufactured separately from the pressure adjusting valve must be installed. Construction is unnecessary. Therefore, the time and effort required for mounting the pressure reducing valve are unnecessary. , The work efficiency in laying the seal gas pressure control valve is greatly improved. Moreover, engineering The cost of expenses will be low. In addition, the pressure reducing valve 21 together with the seal gas pressure adjusting valve It is manufactured and assembled, and the pressure reducing valve 21 is provided at the inlet of the main body 20. A valve case 22 provided in a portion for supplying the primary pressure supplied from the second side, and the valve case It is attached to the rod 23 located at the center of the valve 22 and moves up and down in the valve case 22. A substantially disk-shaped guide 24 and a regulator disk 25 that are housed so as to be movable back and forth. A spring 26 for adjusting pressure which is provided on the upper surface of the guide 24, and the regulator 26. It is formed by a buffer spring 27 mounted on the lower surface of the vibrator disk 25. Since the structure is simple, the number of parts is small and the equipment cost is low.

[0017]   The main valve 5 and the first rod 6 attached to the valve rod 6 of the main valve 5 The strength of the diaphragm 7 and the second diaphragm 8 is designed to be about 0.4 MPa. Even if it is installed, this seal gas pressure control valve is manufactured separately in front of the piping on the inlet side. Unlike the conventional seal gas pressure control valve that installs a pressure reducing valve, The force adjustment valve alone can be used at a primary pressure exceeding 0.4 MPa. Wear.

[0018]

[Effect of device]

  The invention according to claim 1 of the present invention is directed to the inlet side and the outlet side of the seal gas in the tank. From the main valve that opens and closes the communication passage and the inlet that is attached to the valve rod of the main valve A first valve that allows the main valve to move depending on the size of the pressure receiving area of the inflowing gas. Diaphragm and second diaphragm open to the atmosphere and from the inlet side A first pressure chamber to which a seal gas in the tank is supplied via a bypass; It is divided by the diaphragm of the A second pressure chamber to which a seal gas is supplied, and between the second pressure chamber and the outlet side A pilot valve that opens and closes the formed gas flow path, and is connected to the pilot valve A third diaphragm connected through a rod is housed, and the inside of the diaphragm is separated. Image is formed and the seal gas in the tank can flow in through the pressure sensitive tube, resulting in pressure drop. When the third diaphragm is actuated, the pilot valve is gas-operated. Seal gas pressure regulation in a tank with a third pressure chamber openably and closably housed in the channel A valve regulating device, wherein the main body of the gas seal pressure regulating valve device is provided from the inlet side. The supplied primary pressure is the limit strength of the valve function in the gas seal pressure regulating valve device. It is characterized in that a pressure reducing valve for reducing the pressure to a pressure is integrally incorporated. The installation work to install the pressure reducing valve in front of the piping on the inlet side has been omitted, and time and labor have been saved. Is eliminated, the laying work is streamlined, and the construction cost is low.

[0019]   A second aspect of the present invention is the device according to the first aspect, wherein the pressure reducing valve portion is A valve case provided in a portion for supplying the primary pressure supplied from the inlet side of the main body, Mounted on a rod located in the center of the valve case and moved up and down in the valve case. A substantially disc-shaped guide and a regulator disc that are housed so as to be movable back and forth; The pressure regulating spring installed on the upper surface of the guide and the regulator disc Since it is formed by a cushioning spring attached to the lower surface, The structure is simple, the number of parts is small, and the equipment cost is low.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a seal gas pressure regulating valve device of the present invention.

FIG. 2 is a horizontal sectional view of the same.

FIG. 3 is a right side view of the same.

FIG. 4 is a sectional view of a pressure reducing valve portion which also constitutes the present embodiment.

[Explanation of symbols]

1 tank 2 entrance 3 exit 4 passages 5 Main valve 6 Bento 7 First diaphragm 8 second diaphragm 9 Bypass 10 Pressure chamber 11 Needle valve 12 Pressure chamber 13 gas flow path 14 Pilot valve 15 Connection rod 16 Third diaphragm 17 Pressure reducing valve 18 Third pressure chamber 20 body 21 Pressure reducing valve 22 valve case 23 rod 26 spring G seal gas

Claims (2)

[Scope of utility model registration request] 1. A main valve that opens and closes a communication passage between an inlet side and an outlet side of a seal gas in a tank, and the main valve that is mounted on a valve rod of the main valve and has a pressure receiving area of gas flowing from the inlet. And a second diaphragm that is open to the atmosphere, a first pressure chamber to which the seal gas in the tank is supplied from the inlet side via a bypass, and the first diaphragm. A second pressure chamber to which seal gas is supplied from the inlet side by opening and closing the needle valve,
A pilot valve for opening and closing a gas flow path formed between the second pressure chamber and the outlet side, and a third diaphragm connected to the pilot valve through a connecting rod are housed in the diaphragm. A third compartment in which the inside of the tank is partitioned to allow the seal gas in the tank to flow in through the pressure sensitive tube, and the pilot valve is housed in the gas flow path so that the pilot valve can be opened and closed by operating the third diaphragm when the pressure drops.
And a seal gas pressure adjusting valve device in a tank, the primary pressure being supplied from the inlet side to the main body of the seal gas pressure adjusting valve device. A seal gas pressure adjusting valve device in a tank, wherein a pressure reducing valve for reducing the pressure to the limit strength pressure of the valve function is integrally incorporated. 2. The valve case, wherein the pressure reducing valve is provided in a portion for supplying a primary pressure supplied from the inlet side of the main body,
A substantially disk-shaped guide and a regulator disc mounted on a rod located at the center of the valve case and reciprocally movable in the valve case in the vertical direction, and a pressure adjusting member interposed on the upper surface of the guide. The seal gas pressure regulating valve device for a tank according to claim 1, wherein the seal gas pressure regulating valve device is formed by a spring and a buffer spring mounted on a lower surface of the regulator disc.