KR100436967B1 - integrated valve apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated valve device mounted on a fuel tank and having a roll over and fuel evaporation gas discharge control function that serves as a passage for transporting fuel evaporated gas to a canister. A flange having a flange port connected to the canister and first and second passages connected to each other through a first hole therein to transfer the evaporated gas to the flange port, respectively, and being fixedly installed through the upper surface of the fuel tank. A valve; A rollover valve configured to move up and down in the first passage to open and close the first hole; A first spring for imparting elasticity at a lower end of the rollover valve; A retainer fixed to the bottom of the first passage while supporting the first spring; An interruption wall having a second hole formed in the center, a plurality of third holes formed along the edge of the second hole, and installed across the middle of the suspension; and extending the second hole to the upper end to the first passage of the flange valve. A cylindrical adapter valve having a bent cap and a plurality of first opening holes formed at a side thereof and connected to a lower end of the flange valve and having a bent passage; A cylindrical cover float upper valve having a fourth hole corresponding to a second hole of the adapter valve at an upper surface thereof, and having a plurality of second opening holes formed at a side thereof and positioned at a lower end of the adapter valve; A seal plate which is inserted into the cover float upper valve and is opened and closed to open and close the fourth hole, and a float upper valve coupled to a lower end thereof; A second spring providing elasticity in a lifting direction of the float upper valve at a lower end of the float upper valve; A float follower valve coupled to a lower end of the cover float upper valve while supporting the second spring; A third spring providing elasticity in a vertical direction at a lower end of the float follower valve; A plurality of third opening holes coupled to a lower end of the adapter valve and formed on side surfaces of the cover float upper valve and the float lower valve coupled thereto, and a fourth opening formed on a bottom surface of the third spring for supporting the third spring. A housing float valve having a hole; A cylindrical cup float valve coupled to surround a lower end of the housing float valve, the cylindrical cup float valve having a plurality of fifth opening holes and a bottom surface; It provides a valve device including a flapper interposed between the fourth opening hole of the housing float valve and the upper end of the bottom surface of the cup float valve.

Description

Integrated valve apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel device of an automobile, and more particularly, to a valve device having a function of roll over and fuel evaporation gas discharge control mounted on a fuel tank and pumping evaporated gas of fuel to a canister. It is about.

A fuel device is a device that is usually mounted on a vehicle using an internal combustion engine such as a car, and supplies the engine to the engine by adjusting the mixer to an optimum combustion state under any driving conditions of the vehicle. It includes a fuel tank, a fuel pump for pumping fuel stored in the fuel tank (fuel pump) and a fuel filter (fuel filter) for removing foreign matters such as water and dust contained in the fuel.

Each of these components is connected via a fuel line, so that the fuel stored in the fuel tank is finally supplied to a carburetor or electronically controlled fuel injection system and mixed with air in the intake cylinder. The fuel flow path from the fuel tank to the Cabretta is commonly referred to as the fuel system as it is supplied to the cylinder of the engine.

The efficiency of such a fuel system is one of the important factors influencing the engine performance of a vehicle, in particular, power and economics.

In particular, the fuel tank is provided with a plurality of devices such as a panel and a fuel flow meter to suppress fuel fluctuations and flows while driving, and an oil supply pipe for supplying fuel from the outside. The injected and stored fuel will produce fuel evaporation gas over time.

This fuel evaporation gas is gaseous vapor of gasoline, which is a fuel in a car vaporizer or fuel tank, and its composition is the same as hydrocarbon of fuel and it is about 15% of all hydrocarbons emitted from the vehicle. Emissions into the atmosphere can cause serious air pollution.

In general, a vehicle is provided with a canister that collects the fuel evaporation gas and flows it into the intake machine when the engine is stably operated, and a rollover for pumping the fuel evaporation gas therein into the canister. (roll over) valves and fuel gas emission control valves are usually installed.

Each rollover valve and fuel gas discharge control valve will be described in more detail. First, the rollover valve discharges the boil-off gas generated in the fuel tank to the canister to suppress the increase in the internal pressure of the fuel tank, and the vehicle may be overturned. In this case, the liquid fuel is prevented from flowing out through the evaporation gas discharge passage. In other words, the rollover valve captures fuel evaporation gas, which is gasoline vapor generated in the fuel tank when the vehicle is driven or stopped, and canisters. It is a kind of valve to supply with.

In addition, the fuel gas discharge control valve is a device that recovers the fuel evaporation gas generated from the fuel tank to the atmosphere by recovering the boil-off gas such as hydrocarbons in the fuel tank to the canister side when the fuel is injected. Specifically, the fuel is opened during refueling and closed after refueling to control the release of the boil-off gas in the fuel tank.

In this case, the fuel gas discharge control valve device is interlocked according to the oil level of the fuel filled in the fuel tank, and is generally referred to as a control valve because it has a function of adjusting the oil supply amount.

Referring to the drawings, FIG. 1 is a schematic structural diagram illustrating a fuel system of a general vehicle as described above, and a fuel gas discharge control valve 20 and a rollover valve 30 are respectively installed at an upper end of a fuel tank 10. It is connected to the canister 50 in a state.

The fuel evaporation gas is collected by the canister 50 through the fuel gas discharge control valve 20 and the rollover valve 30, respectively, during fueling or when the vehicle is stopped and operated. Is prevented from being discharged, and liquid fuel is prevented from flowing into the canister 50 due to vibration of the vehicle while driving or vehicle shaking such as turning or overturning.

In this case, reference numerals 15 and 40 show an oil supply pipe and an intermittent valve, respectively.

However, a fuel device including such a general rollover valve and a fuel gas discharge control valve exhibits some problems in use, which is a cost and fuel leakage caused by having each valve separately.

That is, the fuel tank is sealed to prevent leakage and leakage of the stored fuel. Each hole for installing the above-described rollover valve and fuel gas discharge control valve device is required to increase the possibility of leakage and leakage through the fuel tank. Have.

In particular, in recent years, a fuel tank made of a synthetic resin material is used for more reliable gas tightness, weight reduction, and corrosion prevention. As a result, a plurality of holes are provided for mounting each of these valves. In fact, the leakage and leakage phenomenon caused by this is frequently observed.

In addition, with the problem of cost increase due to the manufacture and installation of each of these valves, the rollover valve and the fuel gas discharge control valve are generally effective to cope with this problem even if overpressure occurs in the fuel tank once closed. It does not have the ability of anti-cocking, which may cause problems such as deformation and explosion of the fuel tank.

The present invention has been made in order to solve the above problems, it is possible to perform the function of fuel evaporation emissions suppression and rollover at the same time, in particular, the improved integrated valve which can effectively respond to the over-pressure in the fuel tank occurs The object is to provide a device.

1 is a schematic structural diagram schematically showing a structure of a general fuel system

2 is a perspective view of an integrated valve device according to the present invention;

3 is an exploded perspective view of an integrated valve device according to the present invention;

Figure 4 is a cross-sectional view of the combined valve unit according to the present invention

5a and 5b are respectively a perspective view and a cross-sectional view of the rollover valve according to the present invention;

Figure 6a to 6c is a perspective view and a cross-sectional view of the two float valve according to the present invention, respectively

7 is a perspective view of a float upper valve according to the present invention;

8a to 9b is an operating state diagram of the integrated valve device according to the present invention, respectively

<Description of the symbols for the main parts of the drawings>

100: flange valve 102: flange valve port

104, 106: first and second passage 108: upper wall

108a: first hole 120: rollover valve

120a: seal rollover valve 120b: float control valve

122: first spring 124: retainer

200: adapter valve 201: first opening hole

202: interruption wall 202a: second hole

202b: third hole 204: cap

206: second O-ring 290: opening

300: housing float valve 304b: fourth opening hole

304a: third opening hole 304: cover float upper valve

301a: second opening hole 306: fourth hole

308: packing 334: float follower valve

336: third spring 364: float upper valve

366: Second Spring 368: Seal Plate

390: two-float valve 399: flapper

400: cup float valve 402: fifth opening hole

In order to achieve the above object, the present invention is a valve which is mounted to the fuel tank, serves as a passage for collecting the vaporized gas of the fuel and pumped to the canister, the flange port protruding on the upper surface and connected to the canister, and A flange valve having first and second passages connected to each other through a first hole through which a boil-off gas is transferred to the flange port, respectively, and fixedly penetrating through an upper surface of the fuel tank; A flow-over valve coupled to the lower end of the seal roll-over valve and the seal-over valve to open and close the first hole by lifting up and down in the first passage; A first spring for imparting elasticity in a lifting direction of the flow over valve at a lower end of the flow over valve; A retainer fixed to the bottom of the first passage while supporting the first spring; An interruption wall installed across the suspension with a second hole formed in the center, a plurality of third holes formed along the edge of the second hole, and extending the second hole to the upper end to the first passage of the flange valve. A cylindrical adapter valve coupled to a lower end of the flange valve while having a bent cap connecting and a plurality of first opening holes formed at a side thereof; A cylindrical cover float upper valve having a fourth hole corresponding to a second hole of the adapter valve at an upper surface thereof, and having a plurality of second opening holes formed at a side thereof and positioned at a lower end of the adapter valve; A packing for connecting the second hole of the adapter valve and the fourth hole of the cover float upper valve without gap; A seal plate inserted into the float upper valve and opened and closed to open and close the fourth hole, and a float upper valve coupled to a lower end thereof; A second spring providing elasticity in a lifting direction of the float upper valve at a lower end of the float upper valve; A float follower valve coupled to a lower end of the cover float upper valve while supporting the second spring; A third spring providing elasticity in a vertical direction at a lower end of the float follower valve; A housing float valve surrounding the cover float upper valve and the float follower valve coupled thereto, the housing float valve being coupled to a lower end of the adapter valve and having a plurality of third opening holes formed on a side surface and a fourth opening hole formed on a bottom surface thereof; ; A cylindrical cup float valve coupled to and wrap around a lower end of the housing float valve, the cylindrical cup float valve having a plurality of fifth opening holes and a bottom surface; It provides a valve device including a flapper interposed between the fourth opening hole of the housing float valve and the upper end of the bottom surface of the cup float valve.

In particular, the present invention is the flange valve port, and the first and second O-ring (O-ring) which is interposed on the top of the cap of the adapter valve, respectively; It characterized in that it further comprises a plurality of protruding end formed in the concave-convex shape on the side wall of the float upper valve.

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

The present invention is capable of performing a function of general rollover and fuel evaporation gas emission control, and in particular, it provides a more improved integrated valve device capable of effectively responding to overpressure in the fuel tank. 2 is a perspective view of an integrated valve device according to the present invention.

This is a configuration in which the flange valve 100, the adapter valve 200, the housing float valve 300, and the cup float valve 400 are sequentially coupled in appearance. The flange valve 100 is tightly fixed to the fuel tank through a fixing member (not shown) in the state penetrating the upper surface of the fuel tank, thereby serving to support the integrated valve device according to the present invention, At this time, the upper portion exposed to the outside of the fuel tank has a flange valve port (102) connected to the canister (not shown).

The lower end of the flange valve 100, that is, the portion inserted into the fuel tank, the adapter valve 200 and the housing float valve 300 are in turn coupled, the lower end of the housing float valve 300 has a shape surrounding it The cup float valve 400 having a combined to form the appearance of the integrated valve according to the present invention.

The integrated valve according to the present invention will be described in more detail with reference to FIG. 2, FIG. 3, which is an exploded perspective view, and FIG. First and second passages 104 and 106 are formed to penetrate through and connected to the outside, respectively, and the upper end of the first passage 104 into which the rollover valve 120 according to the present invention, which will be described later, is introduced. The upper wall 108 is connected to the second passage 106 to form a first hole 108a through which the boil-off gas enters and exits.

At this time, in Figure 4, it is shown to give an optional diagonal line in order to easily distinguish each part, which does not mean that the material or its function is different.

In addition, the flange valve port 102 installed on the upper end of the flange valve 100 is bent to protrude substantially perpendicular to the upper surface of the flange valve 100 in order to connect with the canister, such a flange valve port 102 Accordingly, the second passage 106 also has a bent shape. Preferably, the end of the flange valve port 102 is provided with a first O-ring 110 for tight coupling with the canister. It is advantageous.

The first passage 104 of the flange valve 100 is inserted into the rollover valve 120 according to the present invention, which serves as a rollover, which is a seal rollover valve (120a) of the top and the flowover of the bottom (float roll over) is characterized in that the valve 120b is implemented by coupling, which is shown in Figures 5a, 5b,

At this time, Figure 5a is a combined perspective view of the rollover valve 120 according to the present invention, Figure 5b is a coupling cross-sectional view thereof, the rollover valve 120 according to the present invention is the first passage of the above-described flange valve 100 The seal rollover valve 120a which connects or blocks the first passage 104 and the second passage 106 by being contacted or spaced from the first hole 108a formed in the upper wall 108 while being drawn in the 104. And, at the lower end thereof, the flow-over valve 120b that is raised or lowered by buoyancy is coupled.

In this case, the seal rollover valve 120a is preferably coupled to the flowover valve 120b with a certain amount of clearance, so that even when the floatover valve 120b is raised due to buoyancy, the first hole (1) may have a small impact. 108a) can be opened and closed for a short time it is possible to reduce the pressure in the fuel tank.

In particular, the rollover valve 120 is adjusted to wait at a predetermined height and the first spring 122 is installed at the lower end of the rollover valve 120 to impart elasticity, which is described above with the flange valve 100. It is supported by a retainer 124 fixedly installed at the lower end of the first passage 104.

The adapter valve 200 having a cylindrical shape at the lower end of the flange valve 100 in which the rollover valve 120 is embedded, and having a plurality of first opening holes 201 through which boil-off gas can be introduced is formed at the upper end of the side wall. The adapter valve 200 is mounted across the middle of the suspension valve 200, and has an interruption wall 202 having a second hole 202a penetrated in the center and a plurality of third holes 202b formed around it. And a bent cap 204 extending from the second hole 202a to the upper end of the interruption wall 202, such that the upper end of the cap 204 is the flange valve 100 described above. Has a configuration to be inserted into the second passage 106.

In this case, preferably, the bent portion provided to the cap 204, in the fuel tank employing an integrated valve according to the present invention, serves as an auxiliary to prevent the backflow of the fuel, the upper end of the cap 204 A second O-ring 206 is interposed to closely connect the upper end of the cap 204 with the second passage 106.

In addition, the lower end of the adapter valve 200 is coupled to the bottom of the cylindrical housing float valve 300 and a cup float valve 400 having a similar cylindrical shape to surround the housing float valve 300 from the bottom in turn. In this case, the cover float upper valve 304 and the float lower valve 334 are respectively coupled to the inside of the housing float valve 300, and the float upper positioned in the combination thereof. It includes the upper valve 364 to reliably open and close the second hole (202a) of the adapter valve 200.

6A and FIG. 6B showing a cross section thereof, the cover float upper valve 304 and the cover float upper valve 304 having a plurality of second opening holes 301a formed on the sidewalls will be described. The float upper valve 364 and the float upper valve 334 is coupled to the lower end of the cover float upper valve 304 in the lower portion of the float upper valve 364, wherein the inside The combination of the cover float upper valve 304 and the float follower valve 334 having the float upper valve 364 is introduced into the housing float valve 300.

At this time, in particular, by forming a plurality of protrusions 364b on the outer wall of the float upper valve 364, it is possible to prevent the cocking phenomenon by dispersing the pressure applied thereto in several branches. It is desirable to.

At this time, the float upper valve 364 introduced into the combination of the cover float upper valve 304 and the float follower valve 334 is supported by a second spring 366 supported by an upper surface of the float follower valve 334. Receiving elasticity, the coupling of the cover float upper valve 304 and the float follower valve 334 is configured to be capable of lifting each of the elastic by the third spring 336 installed on the bottom of the housing float valve 300, As a result, the float upper valve 364 introduced in the combination of the cover float upper valve 304 and the float follower valve 334 is hereinafter referred to as two float valve 390. .

In addition, a fourth hole 306 corresponding to the second hole 202a of the adapter valve 200 is formed on the upper surface of the cover float upper valve 304 so that the cover float when the oil surface of the fuel is increased. As the coupling between the upper valve 304 and the lower float upper valve 334 rises, the second hole 202a and the fourth hole 306 of the adapter valve 200 are contacted and extended.

In this case, in order to closely connect the second hole 202a and the fourth hole 306 with no gap, the upper surface of the cover float upper valve 304 is provided with a packing 308 having a hole in the center thereof. It would be desirable.

In addition, the above-mentioned float float valve 364, which is elastic by the second spring 366, is introduced into the cover float upper valve 304 and the float follower valve 334. The valve 364 opens and closes the fourth hole 306 of the cover float upper valve 304 according to the oil surface. In this case, preferably, an upper end of the float upper valve 364 may provide a seal member, preferably a seal plate 368, to impart closeness to opening and closing of the fourth hole 306 of the cover float upper valve 304. Is fitted.

Accordingly, the cover float upper valve 364 having the float upper valve 364 capable of independent lifting therein, and the cover float upper valve 304 and the float follower valve 334, which are also configured to be elevated, are linked with the rising of the oil surface. By connecting the fourth hole 306 of the valve 304 and the second hole 202a of the adapter valve 200 without any gap, the fourth and second holes 306 and 202a and the third hole 202b are primarily. The fuel is discharged by closing the fourth hole 306 of the cover float upper valve 304 with the rise of the float upper valve 364 when the oil level is continuously raised. This is to prevent the flow into the second hole 202a of the adapter valve 200.

The reason why the two-float valve 390 is adopted is that the float upper valve 364 and the cover float upper valve 304 and the float follower valve 334 are independently coupled to each other at a momentary pressure increase in the fuel tank. By allowing the drive to reduce the pressure in the fuel tank, and also to accurately detect the fuel flow rate of the fuel, which will be described in more detail in the operating state of the integrated valve device of the present invention described below.

In addition, the housing float valve 300 is equipped with a cylindrical cup float valve 400 surrounding the bottom thereof to constitute an integrated valve according to the present invention, wherein the housing float valve 300 is preferably formed in the bottom center It has a third opening hole 304a and a plurality of fourth opening holes (304b in FIG. 3) formed on the side, so that the boil-off gas and fuel can be easily introduced into the integrated valve according to the present invention.

For the same reason, a plurality of openings 290 are formed in the joint portion where the housing float valve 300 and the adapter valve 200 are coupled, and the plurality of fifth opening holes 402 are formed on the side wall of the cup float valve 400. Will be formed.

That is, the housing float valve 300 prevents the departure of the third spring 336 and the cover float upper valve 304, and serves to prevent the flow of fuel during vehicle behavior, which is fuel when fueling the vehicle The fifth opening hole 402 formed in the side surface so that fuel can flow into the tank to raise the coupling of the cover float upper valve 304 and the float follower valve 334 to stop the oil supply to a predetermined capacity of the tank. It has a shape wrapped in the cup float valve 400 having a).

In addition, when the fuel rises between the bottom third opening hole 304a of the housing float valve 300 and the bottom surface of the cup float valve 400, the fuel is lowered from the bottom of the integrated valve according to the present invention. Flapper to minimize the variation in fuel flow rate by preventing the flow of fuel and allowing the fuel introduced through the fifth opening hole 402 of the cup float valve 400 to smoothly flow out in one direction. It is preferable that 399 be provided.

The operation of the integrated valve according to the present invention having the above-described structure is performed when the fuel in the fuel tank is exhausted, as shown in FIG. 8A, respectively, the rollover valve 120, the cover float upper valve 304, and the float follower valve 334. ) And the float upper valve 364 positioned therein are respectively lowered to the lowest position, so that the evaporated gas is freely discharged to the outside through the second hole 202a and the third hole 202b of the adapter valve. do.

Then, when the oil level rises due to oiling or the like, as shown in FIG. 8B, the coupling between the cover float upper valve 304 and the float follower valve 334 first rises to form the fourth hole 306 and the second hole 202a. In close contact with each other, the evaporated gas may be discharged through the fourth hole 306 and the second hole 202a and the third hole 202b, respectively.

If the oil level continues to rise thereafter, as shown in FIG. 8C, the float upper valve 364 located in the combination of the cover float upper valve 304 and the float follower valve 334 is raised to block the fourth hole 306 to evaporate. The gas is discharged only through the third hole 202b, and thus, the precise fuel flow rate may be determined through the structure in which the gas rises sequentially as the oil level rises.

At this time, when the pressure inside the fuel tank rises rapidly due to an external impact or the like, the float float positioned in the combination of the two float valve 390, that is, the cover float upper valve 304 and the float follower valve 334 according to the present invention. Since the valve 364 is independently driven sensitively, it is possible to lower the pressure through the above.

Thereafter, when fuel is excessively introduced into the fuel tank, the rollover valve 120 is finally raised to close the first hole 108a to prevent the fuel from being accumulated in the canister. Will be

In this case, the seal rollover valve 120a constituting the rollover valve 120 according to the present invention and the floatover valve 120b coupled thereto have a certain degree of play, and thus, an instantaneous increase in pressure or flow of the fuel tank is achieved. By opening the first hole (108a) it is possible to discharge the boil-off gas to the canister (see Fig. 5a).

After that, when the oil level is lowered due to the exhaustion of fuel due to the running of the vehicle, it will be easily understood through the above description that the respective operations are performed in the above reverse order.

In addition, when the fuel tank equipped with the integrated valve according to the present invention having such a configuration is inclined by the vehicle overturning or turning, the integrated valve according to the present invention effectively prevents the discharge of fuel to the canister, FIG. 8A. 9A to 9B, the integrated valve device according to the present invention, which maintains the same state as the initial view of FIG. 8A, may be respectively tilted when the fuel tank is inclined due to turning or overturning of the vehicle. Combination of the cover float upper valve 304 and the float follower valve 334 in the order of 9b, and the rise of the float upper valve 364 inside thereof closes the second hole 202a of the adapter valve, thereby primarily providing fuel. Blocking the leak, and when the inclination of the fuel tank increases, the rise of the rollover valve 120 is to completely block the leakage of fuel.

The present invention provides an integrated valve capable of performing both a function of rollover and fuel gas emission control, thereby reducing manufacturing costs and simplifying assembly, as well as improving fuel tank airtightness.

In addition, by providing a roll rollover valve and a seal rollover valve and a flow-over valve, which are coupled to each other, it is possible to return to the minute vibration of the vehicle even when the first hole, the evaporation gas discharge passage, is closed. In addition to the possible advantages, the combination of the cover float upper valve and the float follower valve which rises due to the buoyancy when refueling, and the float upper valve embedded therein are implemented as two float valves which can be independently elevated. When the second hole is forcedly closed by the combination of the cover float upper valve and the float follower valve and the float upper valve when the over pressure is applied or the vehicle is inclined, the internal float upper is subject to a slight shock or the horizontal of the vehicle. Since the valve easily returns, it is possible to discharge the boil-off gas.

In addition, by adopting the structure of the two-float valve, even if the combination of the cover float upper valve and the float follower valve rises due to the buoyancy, the internal float upper valve adjusts the time point at which the second hole is finally closed, so that the flow rate can be adjusted more precisely. It has the advantage that it can be controlled, and by giving a curved shape to the inner cap of the adapter valve inserted into the second passage of the flange valve to prevent the fuel flowing back when the vehicle is running out.

In addition, by providing a plurality of curved shapes on the outer surface of the float upper valve, it is possible to prevent the cocking phenomenon by dispersing the pressure applied to the fork into multiple branches, the cover float upper valve and the housing float valve, the cup A plurality of opening holes are formed on the side wall of the float valve, respectively, thereby facilitating the inflow of boil-off gas and fuel into the valve, thereby realizing more improved effects.

Claims (2)

The valve is mounted on the fuel tank and serves as a passage for trapping the vaporized gas of the fuel and pumping it to the canister, A top surface of the fuel tank having a flange port protruding from an upper surface thereof and connected to the canister, and first and second passages connected to each other through a first hole through which an evaporation gas is transmitted to the flange port respectively; A flange valve fixedly installed therethrough; A flow-over valve coupled to the lower end of the seal roll-over valve and the seal-over valve to open and close the first hole by lifting up and down in the first passage; A first spring for imparting elasticity in a lifting direction of the flow over valve at a lower end of the flow over valve; A retainer fixed to the bottom of the first passage while supporting the first spring; An interruption wall having a second hole formed in the center, a plurality of third holes formed along the edge of the second hole, and installed across the middle of the suspension; and extending the second hole to the upper end to the first passage of the flange valve. A cylindrical adapter valve coupled to a lower end of the flange valve while having a bent cap connecting and a plurality of first opening holes formed at a side thereof; A cylindrical cover float upper valve having a fourth hole corresponding to a second hole of the adapter valve at an upper surface thereof, and having a plurality of second opening holes formed at a side thereof and positioned at a lower end of the adapter valve; A packing for connecting the second hole of the adapter valve and the fourth hole of the cover float upper valve without gap; A seal plate inserted into the float upper valve and opened and closed to open and close the fourth hole, and a float upper valve coupled to a lower end thereof; A second spring providing elasticity in a lifting direction of the float upper valve at a lower end of the float upper valve; A float follower valve coupled to a lower end of the cover float upper valve while supporting the second spring; A third spring providing elasticity in a vertical direction at a lower end of the float follower valve; A housing float valve surrounding the cover float upper valve and the float follower valve coupled thereto, the housing float valve being coupled to a lower end of the adapter valve and having a plurality of third opening holes formed on a side surface and a fourth opening hole formed on a bottom surface thereof; ; A cylindrical cup float valve coupled to and wrap around a lower end of the housing float valve, the cylindrical cup float valve having a plurality of fifth opening holes and a bottom surface; A flapper interposed between the fourth opening hole of the housing float valve and an upper end of a bottom surface of the cup float valve. Valve device including The method according to claim 1, First and second O-rings interposed between the flange valve port and the top of the cap of the adapter valve; A plurality of protrusions formed in the concave-convex shape on the side wall of the float upper valve Valve device further comprising