KR101690557B1 - Safety valve of tank for carrying oil or chemical substance - Google Patents

Abstract

The present invention relates to a safety valve for an oil or chemical substance transport tank. More specifically, the present invention relates to the safety valve for the oil or chemical substance transport tank of which a structure is improved to remove oscillation without a change in flow rate in the same body of the safety valve. According to the present invention, the present invention removes oscillations without the change in flow rate in the same body to satisfy a high velocity vent function.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a safety valve for oil or chemical material transport tanks,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety valve for a fuel tank or a chemical tank, and more particularly, to a safety valve for a fuel tank or a chemical tank which is structurally improved so as to solve oscillation without changing the flow rate in the same body.

Generally, the supersaturated state of the flammable gas generated in the tank is stored in a cargo hold, that is, a tank, of a vessel such as an oil tanker or a chemical tanker for transporting oil or chemical, and when the negative pressure is generated in the tank, A safety valve is installed to adjust it.

In other words, the pressure inside the tank can be increased by the gas volatilized from various oil or chemical substances stored in the tank. In case of oil tanker or chemical carrier, The pressure inside the tank may change depending on the temperature change caused by the temperature change. In this case, as the temperature increases or decreases, an overpressure or a negative pressure is generated.

When the oil or chemical is pumped out from the tank or the oil is supplied from the land or sea reservoir, the pressure in the tank is lowered to generate a negative pressure (vacuum phenomenon) or an overpressure due to an increase in pressure.

When the pressure changes in the closed space, the explosive and flammable oil and chemical substances become unstable, and explosion or fire is more likely to occur. If the tank explodes, a large safety accident occurs, The tank for storing the chemical substance is always provided with a vent pipe leading to the outside.

However, since the above-mentioned ventilation pipe is always open, large amounts of oil and chemicals are evaporated through the ventilation pipe, thereby causing economical loss and becoming one of the causes of polluting the atmosphere.

In order to solve this problem, a number of improved techniques such as the registration method No. 125817, the registration patent No. 0437721, the patent disclosure No. 2004-0012859, and the patent No. 5,060,688 have been disclosed. Japanese Patent No. 1218668 has been disclosed.

On the other hand, in accordance with the emission regulation of VOC (Volatile Organic Compound)

One of these self-relieving measures is to increase the internal pressure of the tank to suppress the generation of VOC. This is based on the characteristics of the VOC having a low saturation vapor pressure. It suppresses the generation of VOC by keeping the tank internal pressure higher than the saturated vapor pressure of the VOC Thereby reducing the amount of oil consumed in the air and preventing air pollution.

However, in the conventional safety valve for a tank, for example, when referring to the drawings of Japanese Patent No. 0437721 and Japanese Patent No. 1218668, it is very inconvenient to change the pressure setting value, and a method of preventing leakage by using the contact surface of the metal The VOC emitted into the atmosphere can not be completely blocked.

That is, in order to increase the internal pressure of the tank, it is necessary to change the weight of the internal space of the valve or to change the set value of the internal pressure only when the spring is replaced, so that a large amount of work is required and troublesome and inconvenient. Also, since the leaked VOC is adhered to the disk or sheet, the leakage amount gradually increases over time.

This means that the disc is not easily lifted by the internal pressure and the set value is increased by adopting a soft seals such as rubber (SOFT SEAL).

In order to solve this problem, the present applicant has been patented the patent for the safety valve for the oil or chemical material transport tank in the registration of patent No. 1521848 (May 05, 2014).

However, due to the ISO 15364 rule during the high velocity vent function, 0.5 Hz must be satisfied in the oscillation test according to the pipe length.

However, since the flow rate must be satisfied, the size of the pipe body must be greatly increased. On the contrary, when the flow rate is satisfied, the oscillation occurs more largely according to the length of each pipe, and the problem of the above-mentioned ISO 15364 is not satisfied.

Therefore, there is an urgent need for a method of satisfying the oscillation without changing the flow rate in the same pipe body.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and provides a safety valve for a tank for transporting oil or chemical substances, which is structurally improved to solve oscillation without changing the flow rate in the same body. There is a main purpose.

In order to achieve the above-mentioned object, the present invention provides a lower body, which is an internal hollow body installed in a tank of an oil tanker or a chemical tanker to eliminate internal pressure of a flammable gas; An upper body fastened and fixed to an upper end of the lower body; A valve disc for opening and closing an open top of the upper body; A valve stem fixed through the valve disc to open and close the valve disc while being raised and lowered in accordance with the internal pressure of the tank; A fixing table fixed to a part of the upper body; The valve stem has a tapered portion formed at a part of a length of an upper end of the valve stem to allow the valve stem to be inserted into the valve disc when the valve disc is passed through the valve stem. Wherein a bottom end of the through hole of the disc is assembled so as to be caught by the jaw and the upper end of the through hole is fastened with a nut so as to move along the valve disc according to the movement of the valve stem, A weight fixed to a lower outer circumferential surface of the stem; A booster having a disc shape and fixed to a lower end of a valve stem passing through the weight; A fixing pin which is fastened to a lower end surface of the valve stem; A plurality of locking bars vertically fixed to the periphery of the fixing pins; And an upper end thereof is a cylindrical shape and the upper end of the closed upper end includes a dragger through which the fixing pin is inserted, characterized in that the lower end is open and the upper end is a closed cylindrical shape, A safety valve is provided.

At this time, the latching bars are provided along the circumference of the fixing pin at three intervals of 120 degrees apart from each other; And the latch slot formed in the dragger is also formed to correspond to the latch bar.

According to the present invention, it is possible to solve the oscillation without changing the flow rate even in the same body, thereby achieving the effect of satisfying the high velocity vent function.

1 is an exemplary perspective view of a safety valve for a oil or chemical delivery tank according to the present invention;
2 is an exemplary cross-sectional view of a safety valve for a oil or chemical delivery tank according to the present invention.
3 is a side view of Fig.
4 is a front view of Fig.
5 is an exemplary view of a dragger and a booster applied to a safety valve according to the present invention.

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

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

1 to 4, a safety valve for a fuel or chemical material transporting tank according to the present invention includes an upper body 100 and a lower body 200, It is not much different.

A valve disc 110 is provided on the upper surface of the upper body 100 to open and close the opening. A valve stem 120 is fixed to the center of the valve disc 110.
At this time, a jaw TR is formed in a part of the upper end of the valve stem 120 so that the lower end of the through hole of the valve disc 110 is assembled so as to be caught by the jaw TR when passing through the valve disc 110, The upper end of the valve stem 120 is fastened with a nut NT so that the valve stem 110 can be moved along the valve stem 120.

Accordingly, when the internal pressure is increased, the valve stem 120 is lifted up while the valve disc 110 is lifted up together with the chin TR, so that the internal gas is vented to the atmosphere, so that the internal pressure is relieved, . When the internal pressure is released, the valve disc 110 is lowered again due to its own weight and closed.

In addition, a fixing table 140 is integrally fixed to the flange 130 of the upper body 100 so as to be integrally fixed to the upper body 100 so that the pressure at which the valve disc 110 can be opened can be freely set and changed outside the valve .

The fixing table 140 has a substantially 'b' shape, and a binding hole 150 is rotatably hinged to an upper end of the fixing table 140.

At this time, one end of the binding member 150 is hinged to the upper end of the fixing table 140 as described above, but the other end is bent several times so as to be hung on the valve stem 120 or the valve disc 110, So that the high-speed vent function is performed is the same as that of the present invention.

Also, the binding hole 150 is provided with a pressure setting rupture pin 152, which is the same as that of the registered patent.

The present invention is characterized in that the internal structure of the safety valve is improved on the basis of such a basic structure to maximize the safety by allowing the same pipe body to satisfy the oscillation range defined by the ISO 15364 specification without changing the flow rate.

2 and 5, the weight 300 is fixed to the lower outer circumferential surface of the valve stem 120 to set the opening and closing operation.

That is, the weight 300 serves as means for setting the open pressure of the safety valve. In other words, when the pressure of the weight 300 is higher than the load of the weight 300, the weight 300 rises and ruptures the rupture pin 152 of the safety valve, .

A fixing pin 400 is fastened to a lower end surface of the valve stem 120.

The locking bar 410 is integrally fixed to the lower end of the fixing pin 400 in a direction orthogonal to the longitudinal direction of the fixing pin 400. That is, And three are provided in the circumferential direction.

In addition, the latch bar 410 is assembled to allow the dragger 420 to pass through the dragger 420. The dragger 420 is formed in a cylindrical shape with a lower surface opened, And a dragger through hole 422 is formed at the center of the sealed upper surface.

In addition, three dragging slits 424 are formed at intervals of 120 degrees in the circumferential direction of the dragger 420. The engaging slits 424 are formed to extend from the opened lower end toward the upper end.

In addition, the latching bar 410 is inserted into the latching slit 424 and hooked.

At this time, when the dragger 420 is installed, the maximum bottom dead center of the dragger 420 should be always above the pipe connection part 500.

When the dragger 420 is provided, when the pressure fluctuation occurs, the dragger 420 moves up and down along the latching bar 410 to absorb the pressure fluctuation and absorb the shock, so that oscillation is suppressed and ultimately .

On the other hand, a booster 430 is seated on the upper surface of the dragger 420.

The booster 430 is in the form of a disk flap and must be configured to have a larger diameter than the diameter of the dragger 420.

A booster hole 432 is formed in the center of the booster 430 so as to be inserted into the lower end of the valve stem 120.

The booster 430 is in contact with the lower end of the weight 300 and the lower end of the booster 430 is in contact with the upper end of the dragger 420.

When the booster 430 is installed, the booster 430 has a larger diameter than the dragger 420 when the pressure fluctuates. Therefore, the booster 430 performs the flow rate control and the pressure maintaining function when the flow rate changes inside the valve.

That is, since the pressure and the flow velocity coming from the tank receive a great resistance by the booster 430 and the dragger 420, the force for lifting up to the pressure set by the weight 300 is further weighted, To allow the pressure to stay closed at once.

In particular, since the latching bar 410 is engaged with the latching slit 424, the fluidized portions of the portion constituting the safety valve are prevented from rotating, thereby further facilitating the operation.

Therefore, oscillation does not occur largely because the sudden pressure fluctuation is suppressed by buffer absorption due to the interaction between the dragger 420 and the booster 430, so that it can be controlled to 0.5 Hz or less as defined by ISO 15364 .

In addition, since the booster 430 uniformizes the flow rate fluctuation generated in the process, the oscillation problem can be solved without increasing the size of the pipe body during the high-speed vent.

The reference symbol 'LH' is a lifting handle which is used for opening and closing to check whether internal cleaning and internal driving parts are fixed or not.

100: upper body 200: lower body
300: Weight 400: Fixing pin
500: Piping connection part

Claims (2)

A lower body which is an internal hollow type installed in a tank of an oil tanker or a chemical tanker to eliminate the internal pressure of the flammable gas; An upper body fastened and fixed to an upper end of the lower body; A valve disc for opening and closing an open top of the upper body; A valve stem fixed through the valve disc to open and close the valve disc while being raised and lowered in accordance with the internal pressure of the tank; A fixing table fixed to a part of the upper body; The valve stem has a tapered portion formed at a part of a length of an upper end of the valve stem to allow the valve stem to be inserted into the valve disc when the valve disc is passed through the valve stem. And a lower end of the through hole of the disk is assembled so as to be caught by the jaw, and the upper end of the through hole is fastened with a nut so that the valve disk can move along the movement of the valve stem,
A weight fixed to a lower outer circumferential surface of the valve stem;
A booster having a disc shape and fixed to a lower end of a valve stem passing through the weight;
A fixing pin which is fastened to a lower end surface of the valve stem;
A plurality of locking bars vertically fixed to the periphery of the fixing pins;
And an upper end thereof is a cylindrical shape and the upper end of the closed upper end includes a dragger through which the fixing pin is inserted, characterized in that the lower end is opened and the upper end is closed, Safety valve for.
The method of claim 1,
Wherein the latching bars are provided along the circumference of the fixing pin at three intervals of 120 degrees apart from each other; And a latching slot formed in the dragger is formed to correspond to the latching bar.

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