KR102365189B1 - Pressure and Vacuum Relief Valve - Google Patents

Abstract

The present invention relates to a pressure and vacuum relief valve and, more specifically, to a pressure and vacuum relief valve, which is provided on the exhaust port of a tank that stores various types of oil or chemicals and can discharge indoor air or inject outdoor air according to changes in the pressure in the tank, thereby maintaining a constant pressure in the tank. The pressure and vacuum relief valve comprises: a valve body having a cylindrical shape with an open lower surface and an inner hollow, having a seating portion formed by the bent wall surface of a lower end thereof, and having a plurality of vent holes formed in an upper side of the seating portion therethrough along the circumference thereof; a valve stem installed inside the valve body, and raised and lowered by the pressure in the tank; an opening and closing disk positioned between the inner circumferential surface of the valve body and the outer circumferential surface of the valve stem to be seated on the seating portion, and moving according to the raising and lowering of the valve stem to open and close the vent holes; a first elastic body installed outside the valve stem, and having one end supported on one side of the valve stem and the other end supported on the upper surface of the opening and closing disk, to return, to an original position, the valve stem raised or lowered by a predetermined elasticity; and a second elastic body installed outside the valve stem, and having one end supported on the upper surface of an inner side of the valve body and the other end supported on the upper surface of the opening and closing disk, to return, to the original position, the opening and closing disk raised or lowered by a predetermined elasticity.

Description

Pressure and Vacuum Relief Valve

The present invention relates to a pressure vacuum relief valve, and more particularly, is provided on the exhaust port of a tank for storing various oils or chemicals, and discharges bet air or injects outside air according to the pressure change inside the tank to reduce the internal pressure of the tank It relates to a pressure vacuum relief valve that allows it to be kept constant.

In general, a tank for storing various oils or chemicals is a sealed container, and a sudden change in pressure inside the tank may cause a large safety accident or human accident due to explosion or damage.

For example, oil vapor generated by dripping or stored oil or chemicals in the tank forms oil vapor pressure, that is, supersaturation pressure, inside the tank, which causes the tank to expand and reduce the possibility of explosion. height is the cause.

On the other hand, when the oil or chemicals stored in the tank are discharged to the outside of the tank, a negative pressure (vacuum phenomenon) is generated inside the tank, which may cause the tank to be crushed and damaged.

In order to prevent this phenomenon, the internal pressure of the tank must be maintained within a specific set range by discharging or injecting air according to the change in pressure inside the tank. The vapor pressure had to be measured regularly, which added to the management burden of the tank.

Accordingly, Korean Patent No. 10-1098380 (pressure relief valve for oil storage tank), Korean Patent No. 10-1380829 (vacuum relief valve), Korean Patent No. 10-1690557 (for oil or chemical transport tanks) safety valve), etc., it is interlocked according to the pressure change inside the tank, and when the pressure inside the tank is over the set range, the bet, that is, the oil vapor is forcibly discharged to solve the state of supersaturation pressure in the tank, and the pressure inside the tank When it falls below this setting range, many devices have been developed and developed to adjust the negative pressure in the tank by sucking in the outside air and forcing it into the tank.

However, the conventional device has a very complicated internal structure, resulting in a high manufacturing price, as well as a relatively low efficiency of discharging oil vapor or inhaling external air. .

Republic of Korea Patent Publication No. 10-1098380 (2011.12.19.) Republic of Korea Patent Publication No. 10-1380829 (2016.12.22.) Republic of Korea Patent Publication No. 10-1690557 (2014.03.27.)

The present invention has been devised to solve the above problems, and the present invention is provided on the exhaust port of a tank for storing various oils or chemicals, and oil vapor generated by dripping or stored oil or chemicals in the tank It is to provide a pressure vacuum relief valve that eliminates the state of oversaturation in the tank by forcibly discharging the bet containing

In addition, another object of the present invention is to make it possible to reduce the manufacturing cost and more efficiently control the internal pressure regardless of the size of the tank to be applied by configuring the structure of the discharge of oil vapor in the tank and the intake of external air to be very simple. It is to provide a pressure vacuum relief valve with

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

In order to achieve the above object, the present invention has a cylindrical shape with an open lower surface and a hollow inside, a seat portion is formed by bending the lower end wall surface, and a plurality of vent holes are formed through the periphery on the upper side of the seat portion. body; a valve stem installed inside the valve body and ascending and descending by the tank internal pressure; an opening/closing disk positioned between the inner circumferential surface of the valve body and the outer circumferential surface of the valve stem to be seated on the seating part, moving according to the elevation of the valve stem, and opening and closing the vent hole; a first elastic body installed outside the valve stem, one end supported on one side of the valve stem, and the other end supported on the upper surface of the opening/closing disk to return the valve stem in a raised or lowered state by a predetermined elasticity to its original position; and a second elastic body installed on the outside of the valve stem, one end supporting the inner upper surface of the valve body, and the other end being supported by the upper surface of the opening and closing disk to return the opening and closing disk lifted by a predetermined elasticity to its original position; It is possible to provide a pressure vacuum relief valve comprising a.

At this time, the height of the opening/closing disk is formed to be smaller than the height of the vent hole, and when negative pressure is generated inside the valve body, external air is introduced into the valve body through a gap formed by the height difference between the opening and closing disk and the vent hole. It is characterized in that the negative pressure acting inside the valve body is adjusted by passing through the clearance space formed between the opening and closing disk and the valve stem lowered due to the negative pressure.

On the other hand, the valve stem includes a vertical body having a column shape and installed through the valve body from the upper surface, a head portion protruding along the outer circumferential surface of the lower end of the vertical body and having an outer circumferential surface in contact with the inner circumferential surface of the opening/closing disk, and an inner circumferential end of the vertical body It is inserted and fixed on the upper outer circumferential surface of the body and characterized in that the lower end is provided with an annular support for supporting one end of the first elastic body.

In addition, the valve stem has a recess recessed to a predetermined depth along the outer circumferential surface of the head part, and an O-ring is inserted and coupled to the recess to maintain airtightness between the valve stem and the opening/closing disk, and the O - It is characterized in that the opening/closing disk moves up and down along the valve stem by friction of the ring.

In addition, the valve stem has a diameter larger than that of the vertical body, and is coupled to the upper end of the vertical body in a state located outside the valve body to prevent separation of the valve stem from the valve body. It is characterized in that it is further provided.

The present invention is provided on the exhaust port of a tank for storing various oils or chemicals, and by forcibly discharging a bet containing oil vapor generated by dripping or stored oil or chemicals in the tank, the supersaturation pressure state in the tank is reduced. There is an advantage in that it is possible to prevent the tank from being in a vacuum state by forcibly introducing outside air into the tank when oil or chemicals are discharged.

In addition, the present invention has the advantage of being able to reduce the manufacturing cost and more efficiently control the internal pressure regardless of the size of the tank to which it is applied, by very simply configuring the structure of the discharge of oil vapor in the tank and the intake of external air. there is.

1 is a cross-sectional view of a pressure vacuum relief valve according to a preferred embodiment of the present invention;
Figure 2 is a partial enlarged view of part A shown in Figure 1;
3 is a cross-sectional view showing a state in which the pressure vacuum relief valve discharges oil vapor according to a preferred embodiment of the present invention.
Figure 4 is a cross-sectional view showing a state in which the pressure vacuum relief valve according to a preferred embodiment of the present invention sucks outside air.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

With reference to the accompanying drawings will be described in detail for the implementation of the present invention. Irrespective of the drawings, like reference numbers refer to like elements, and "and/or" includes each and every combination of one or more of the recited items.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

The terminology used herein is for the purpose of describing the embodiments, and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a pressure vacuum relief valve according to a preferred embodiment of the present invention, and FIG. 2 is a partial enlarged view of part A shown in FIG. 1 .

1 to 2, the pressure vacuum relief valve is installed on one side of a tank for storing various oils or chemicals to keep the internal pressure of the tank constant, and is largely a valve body (10). , a valve stem 20 , an opening/closing disk 30 , a first elastic body 40 and a second elastic body 50 .

First, the valve body 10 is a structure coupled to the exhaust port formed on the upper side of the tank, and is formed to have a cylindrical shape with an open lower surface and a hollow inside.

Specifically, the valve body 10 has a hollow cylindrical shape with open upper and lower surfaces, and is installed at the upper end of the first body 12 and the first body 12 constituting the side surface of the valve body 10 . A second body 14 forming the upper surface of the body 10 is provided.

The lower end wall of the first body 12 is bent to form a seating portion 12a on the inside, and on the outer peripheral surface of the lower end, connecting members such as a half coupling and a boss installed in the exhaust port (not shown) A screw thread (12b) coupled with is formed.

Preferably, when the screw thread 12b is formed in a portion corresponding to the lower side from the bent portion of the lower end of the first body 12 and the valve body 10 is coupled to the exhaust port, the first body ( The curved surface of 12) is seated on the upper surface of the tank.

On the other hand, the second body 14 is coupled in such a way that the outer diameter of the lower end corresponds to the inner diameter of the first body 12, the second body 14 is fitted to the first body (12). .

In this case, the first body 12 and the second body 14 are welded to the contact portion to secure the airtightness of the valve body (10).

In addition, a plurality of vent holes 13 opened in a semicircular shape are formed on one side of the valve body 10 to provide a passage through which bet air containing oil vapor in the tank is discharged or outside air is introduced.

Preferably, the vent holes 13 spaced apart at regular intervals along the periphery of the lower end of the second body 14 are formed, and more preferably, the vent holes 13 are located above the seating portion 12a. is provided in

Next, the valve stem 20 is installed inside the valve body 10, rises and falls by the internal pressure of the tank, and serves as an axis of the pressure vacuum relief valve for opening and closing the vent hole 13

Specifically, the valve stem 20 is largely composed of a vertical body 22 and a head portion 23 .

The vertical body 22 has a long and slender column shape, penetrates the upper surface of the valve body 10 , that is, the first body 12 , and is installed in the central portion of the valve body 10 .

In addition, the head part 23 is formed to protrude along the outer peripheral surface of the lower end of the vertical body 22 , and the outer peripheral surface of the head part 23 is formed to be in contact with the inner peripheral surface of the opening/closing disk 30 .

At this time, a recess 23a recessed to a predetermined depth is formed along the outer circumferential surface of the head portion 23, and an O-ring 23b is inserted and coupled to the recess 23a to open and close the valve stem 20 and the opening and closing. It is characterized in that the opening/closing disk 30, which will be described later, rises and descends along the valve stem 20 by friction of the O-ring 23b as well as maintaining airtightness between the disks 30 .

Accordingly, in the valve stem 20, the vertical body 22 supports the first body 12 according to the internal pressure of the tank applied to the lower surface of the head part 23, and the vertical body 22 can ascend and descend, As a result, the opening/closing disk 30 moves to open and close the exhaust port 130 .

In addition, an annular support 25 for supporting one end of the first elastic body 40 to be described later is installed on the outer peripheral surface of one side of the valve stem 20 .

Preferably, an outer periphery 24 surrounding the outer circumferential surface is installed at the upper end of the vertical body 22, and a coupling groove 24a is recessed at the lower end of the outer periphery 24, and the support body is formed in the coupling groove 24a. The inner peripheral end of the vertical body 22 is inserted and fixed.

In addition, the upper end of the valve stem 20 exposed to the outside of the valve body 10, that is, at the upper end of the vertical body 22, an upper cap 26 having a larger diameter than the diameter of the vertical body 22 is further provided. can be provided.

Here, the upper cap 26 is coupled to the upper end of the vertical body 22 in a state located outside the valve body 10 to prevent separation of the valve stem 20 from the valve body 10 . By doing so, it can be coupled to the upper end of the valve stem 20 by a fastening member 27 such as a bolt having a thread formed on the outer circumferential surface.

Next, the opening/closing disk 30 moves according to the elevation of the valve stem 20 and opens and closes the vent 13 , between the inner peripheral surface of the valve body 10 and the outer peripheral surface of the valve stem 20 . is located in

Specifically, the opening/closing disk 30 is formed to have an annular shape, so that the outer peripheral surface is in contact with the inner peripheral surface of the valve body 10, and the inner peripheral surface is in contact with the outer peripheral surface of the valve stem 20, preferably, the opening and closing disk 30 The lower surface of the seat portion 12a is seated so that the inner circumferential surface is in close contact with the outer circumferential surface of the head portion 23, thereby moving according to the elevation of the valve stem 20 and opening and closing the ventilation hole 13.

At this time, the height of the opening/closing disk 30 is formed to be smaller than the height of the vent hole 13 to provide a passage through which external air can be introduced into the valve body 10, a more detailed description will be given later.

In addition, the inner peripheral surface of the opening and closing disk 30 is formed to correspond to the outer peripheral surface of the head part 23, and preferably, the inner peripheral surface of the opening and closing disk 30 is formed to be inclined so that the inner diameter of the upper part is smaller than the inner diameter of the lower part. , when the bet containing oil vapor is discharged, the opening/closing disk 30 is in close contact with the head part 23 so that it can be easily raised and lowered, whereas the head part of the valve stem 20 descends when outside air is introduced. (23) guides down along the inner circumferential surface of the opening/closing disc 30 so that the valve stem 20 and the opening/closing disc 30 can be easily separated.

At the same time, a recess 32 recessed upward to a predetermined depth is formed on the lower surface of the opening/closing disk 30 , and the groove 32 is airtight between the valve body 10 and the opening/closing disk 30 . When the O-ring 33 is inserted and coupled to maintain the vent hole 13 and the internal pressure of the pressure vacuum relief valve maintains a predetermined reference value in the closed state, the bet is not discharged or outside air is introduced.

In addition, a fixing groove 34 formed by being depressed to a predetermined depth downward is formed on the upper surface of the opening/closing disk 30, and the first elastic body 40 and the second elastic body (to be described later) in the fixing groove 34 ( 50) is positioned so that they can be fixed on the opening/closing disk 30.

Meanwhile, the valve stem 20 is elastically supported by the first elastic body 40 , and the opening/closing disk 30 is elastically supported by the second elastic body 50 .

Specifically, the first elastic body 40 is installed on the outside of the valve stem 20 , and preferably, one end of the valve stem 20 is closely supported on one side, that is, the lower end surface of the support body 25 . The other end is supported and fixed on the upper surface of the opening/closing disk 30, that is, the fixing groove 34, and serves to return the valve stem 20 in a raised or lowered state by a predetermined elasticity to its original position.

On the other hand, the second elastic body 50 is installed outside the valve stem 20, the diameter is formed larger than that of the first elastic body 40 is located outside the first elastic body 40, one end of the The inner upper surface of the valve body 20 is supported, and the other end is supported and fixed on the upper surface of the opening/closing disc 30, that is, the fixing groove 34, and the opening/closing disc 30 in a state of being lifted by a predetermined elasticity is placed in place. serves to return to

3 is a cross-sectional view illustrating a state in which the pressure vacuum relief valve discharges oil vapor according to a preferred embodiment of the present invention.

When oil vapor is generated during loading or storage of oil or chemicals in the tank, the internal pressure of the tank is increased, and the internal pressure of the pressure vacuum relief valve communicating with the tank is also increased.

At this time, since the tank is a closed structure on all sides, if the internal pressure is continuously increased, the wall of the tank may expand and explode, so the control of the internal pressure is required.

Accordingly, the pressure vacuum relief valve, as shown in FIG. 3 , when the pressure in the tank and the pressure vacuum relief valve exceeds a predetermined reference value, the pressure acts on the lower surface of the valve stem 20 and the valve stem The opening/closing disk 30 in close contact with the valve stem 20 is supported by the valve stem 20 and lifted together with the valve stem 20, so that the ventilation hole 13 is It may be opened to discharge the bet containing the oil vapor in the tank and the pressure vacuum relief valve to the outside.

At this time, the elevation height of the valve stem 20 and the opening/closing disk 30 is limited by the first elastic body 40 and the second elastic body 50 .

Thereafter, as the bet is discharged, the pressure in the tank and the pressure vacuum relief valve is reduced, and through this, the force pressing the valve stem 20 is also reduced, so that the opening/closing disk 30 is moved to the seating portion 12a. ) until the valve stem 20 and the opening/closing disk 30 descend, the vent hole 13 is gradually closed, and the lower end of the head unit 23 is the inner lower end of the valve body 10. That is, it is located at the upper end of the inner periphery of the seating portion 12a and blocks the passage through which the bet is introduced from the tank.

In other words, when the internal pressure of the tank in which the pressure vacuum relief valve is installed exceeds a predetermined reference value, the valve stem 20 and the opening/closing disk 30 are raised and lowered by the internal pressure of the tank, and the vent hole 13 ) to discharge the bet of the tank to restore the internal pressure of the tank to a reference value, and the valve stem 20 and the opening/closing disk 30 are When it slowly descends and returns to its original position, the valve stem 20 and the opening/closing disk 30 block the passage through which the bet flows from the tank to the inner lower end of the valve body 10, so that the bet of the tank is no longer that is not emitted.

4 is a cross-sectional view showing a state in which the pressure vacuum relief valve sucks outside air according to a preferred embodiment of the present invention.

When oil or chemicals are discharged into the tank, the internal pressure of the tank is reduced and negative pressure may occur, and as a result, the tank wall may be crushed and damaged to the extent that it cannot be used properly or lose its shape, so even in this case Adjustment of the tank internal pressure is required.

Therefore, in the pressure vacuum relief valve, as shown in FIG. 4, when the pressure in the tank and the pressure vacuum relief valve is lower than a predetermined reference value, the valve stem 20 is lowered by the pressure decrease, As a result, a clearance is formed between the outer circumferential surface of the head part 23 and the inner circumferential surface of the opening/closing disc 30, which are in close contact with each other, and the height difference between the opening/closing disc 30 and the vent hole 13 causes the Outside air flows into the pressure vacuum relief valve through a gap formed between the upper end of the opening/closing disk 30 and the vent 13, passing through the clearance space formed between the valve stem 20 and the opening/closing disk 30 to the tank is supplied with

In other words, when the internal pressure of the tank in which the pressure vacuum relief valve is installed is lower than a predetermined reference value, the valve stem 20 is lowered by the internal pressure of the tank, and the head part 23 is moved to the opening/closing disk 30 ), and outside air is introduced through a gap formed by the height difference between the opening and closing disk 30 and the vent hole 13, and through between the valve stem 20 and the opening and closing disk 30, the tank It is possible to prevent a negative pressure from being generated inside the tank by being supplied to the tank.

Although embodiments of the present invention have been described with reference to the above and the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can practice the present invention in other specific forms without changing its technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: valve body
12: first body
12a: seating part
12b: thread
13: vent hole
14: second body
20: valve stem
22: vertical body
23: head
23a: groove
23b : O-ring
24: outer subject
25: support
26: upper cap
30: open/close disk
32: groove
33 : O-ring
34:
40: first elastic body
50: second elastic body

Claims (5)

a valve body having a cylindrical shape with an open lower surface and a hollow inside, a lower wall surface is bent to form a seating part, and a plurality of vent holes are formed through the periphery on an upper side of the seating part;
a valve stem installed inside the valve body and ascending and descending by the tank internal pressure;
an opening/closing disk positioned between the inner peripheral surface of the valve body and the outer peripheral surface of the valve stem to be seated on the seating part, moving according to the elevation of the valve stem, and opening and closing the vent hole;
a first elastic body installed outside the valve stem, one end supported on one side of the valve stem, and the other end supported on the upper surface of the opening/closing disk to return the valve stem in a raised or lowered state by a predetermined elasticity to its original position; and
a second elastic body installed on the outside of the valve stem, one end supporting the inner upper surface of the valve body, and the other end being supported on the upper surface of the opening and closing disk to return the opening and closing disk in a raised state by a predetermined elasticity to its original position; including,
The height of the opening and closing disk is formed smaller than the height of the ventilation hole,
When negative pressure is generated inside the valve body, outside air flows into the valve body through a gap formed by the height difference between the opening and closing disk and the vent hole, and a clearance space formed between the opening and closing disk and the valve stem lowered due to negative pressure. A pressure vacuum relief valve, characterized in that the negative pressure acting on the inside of the valve body is adjusted by passing through. delete According to claim 1,
The valve stem is
A vertical body having a column shape and installed through the valve body from the upper surface,
a head portion protruding along the outer circumferential surface of the lower end of the vertical body, the outer circumferential surface being in contact with the inner circumferential surface of the opening/closing disk;
The inner peripheral end is inserted and fixed on the upper outer peripheral surface of the vertical body, the pressure vacuum relief valve, characterized in that the lower end is provided with an annular support for supporting one end of the first elastic body. 4. The method of claim 3,
The valve stem is
A recess recessed to a predetermined depth is formed along the outer peripheral surface of the head part,
An O-ring is inserted into the groove to maintain airtightness between the valve stem and the opening/closing disc, and the opening/closing disc is raised and lowered along the valve stem by friction of the O-ring. relief valve. 4. The method of claim 3,
The valve stem is
An upper cap having a larger diameter than the diameter of the vertical body and coupled to the upper end of the vertical body in a state located outside the valve body to prevent separation of the valve stem from the valve body is further provided. Pressure vacuum relief valve.

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