Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2000-02-28
2001-06-05
Buiz, Michael (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S515000, C137S592000
Reexamination Certificate
active
06240957
ABSTRACT:
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to a valve having a backward flow prevention function disposed in a tank. Especially, the present invention relates a valve which changes a flow direction of a guided fluid at an outlet side while a decrease of supply ability of the fluid in accordance with the change of the flow direction is prevented. Also, the present invention relates to a valve made of plastic integrally welded with a tank, wherein a valve seat can be securely closed by a valve member.
In a port for supplying a fuel in a fuel tank of an automobile, a valve having backward flow prevention means is provided so that gasoline does not flow backwardly at the time of filling a fuel.
In case a fuel tank
120
provided with a valve
100
is made of plastics, as shown in
FIG. 16
, the valve
100
is made of plastics and has a cylindrical shape provided with an annular outer peripheral flange
103
in a middle portion thereof, and front and rear portions of the outer peripheral flange
103
are formed as an insertion cylinder portion
101
and an attachment cylinder portion
102
for a filler hose
130
. Then, a distal end opening of the insertion cylinder portion
101
is oriented in a direction perpendicular to a center line of the insertion cylinder portion
101
, and an open end surface of the opening is constituted as a valve seat, to which a plate-like valve member
105
is urged against the valve seat in a vertically downward direction. The insertion cylinder portion
101
is inserted in a horizontal direction into an attachment hole
121
formed in the fuel tank
120
, and the outer peripheral flange
103
is disposed to abut against and welded to a portion of a surrounding wall
122
of the attachment hole
121
in the fuel tank
120
.
In the valve
100
structured as describe above, the valve
100
is attached to the fuel tank
120
by inserting and welding the insertion cylinder portion
101
of the valve
100
into the attachment hole
121
in the fuel tank
120
. Thus, there is an advantage that even if an internal pressure of the fuel tank
120
becomes high, a back flow of the fuel from the fuel tank
120
is prevented. On the contrary, there is a disadvantage that a direction of a flow of a fluid, such as gasoline, guided by the valve
100
from the filler hose
130
toward the fuel tank
120
is not changed at an outlet side of the valve
100
, and the fluid flows into the fuel tank
120
as it is.
In view of the above, as shown in
FIG. 17
, there has been prepared a cylindrical valve
100
made of plastics and provided with an outer peripheral flange
103
in an annular shape at a middle portion thereof, and front and rear of the outer peripheral flange
103
are formed as an insertion cylinder portion
101
and an attachment cylinder portion
102
. Further, an upper portion of the distal end opening portion of the insertion cylinder portion
101
is closed by a closing plate portion
104
, and an open end surface of an opening in a semi-circular arch shape, which orients in a direction perpendicularly to a center line of the cylinder portion and is formed between a lower end rim of the closing plate portion
104
and the distal end opening portion, is formed as a valve seat. And, a plate-like valve member
105
is provided to be urged against the valve seat in a vertically downward direction. The valve
100
is structured such that in a condition that the insertion cylinder portion
101
is inserted into an attachment hole
121
formed in the fuel tank
120
, the outer peripheral flange
103
abuts against and is welded to a surrounding wall
122
of the attachment hole
121
in the fuel tank
120
.
However, in the valve
100
structured as described above, even though there is an advantage that a direction of a fluid, such as supply fuel, is changed at the distal end side of the valve
100
attached to the fuel tank
120
so that the fuel can be supplied to the fuel tank
120
, there is a disadvantage that an area of the opening at the outlet side of the valve
100
is extremely smaller than an area of the opening at the inlet side of the valve
100
, so that an ability of smoothly supplying fuel can not be obtained.
The present invention has been made to solve the above disadvantages in the conventional valve, and a main object of the present invention is to provide a valve in which a direction of the a supply fluid is changed at a distal end side of the valve while preventing a decrease of fluid supply characteristic in accordance with the change of the flow direction of the fluid.
Another object of the invention is to provide a valve as stated above, wherein a decrease of fluid cutoff characteristic induced by the means for preventing the decrease of fluid supplying characteristic can be effectively prevented.
Further objects and advantages of the invention will be apparent from the following description of the invention.
SUMMARY OF THE INVENTION
In order to attain the above objects, a first aspect of the invention is directed to a valve in a cylindrical shape formed of a valve main body, and a valve member. The valve main body has a valve seat at an outer end surface of an outlet, to which the valve member is attached such that the valve member opens by a fluid flowing from an inlet side to an outlet side while preventing a backward flow from the outlet side to the inlet side.
The valve main body can be inserted from the outlet side of the valve into a hole of a valve attaching portion of a tank. A flange of the valve main body abuts against and is welded to the valve attaching portion.
At a distal end of the outlet side of the valve main portion, there is provided a wall portion for changing a flowing direction of a fluid guided by the valve main body. The outlet opening is opened to cross obliquely to the fluid flow guided by the cylindrical wall such that the area of the outlet opening is greater in size than that at the inlet side.
In the valve as structured above, the valve with the valve member for preventing a back flow of the fluid at the outlet side can be inserted from the outlet side into the attachment hole of the tank and is integrally welded thereto. In the valve, the flow direction of the fluid guided by the valve can be changed at the outlet side without decreasing the supply amount of the fluid.
In the second aspect of the invention, the valve main body has a cylindrical shape with an outer flange, and is formed of a first cylindrical member having an attachment portion for a hose and a connection portion, and a second cylindrical member connected to the connection portion and having the valve member at the distal end. The second cylindrical member and the valve member are made of a plastic material harder in swelling the fluid than a plastic material for the first cylindrical member.
In the valve as structured above, the valve can be inserted from the outlet side thereof into the attachment hole of the tank and is integrally welded thereto. The flow direction of the fluid guided by the valve can be changed at the outlet side without decreasing the supply amount of the fluid. Also, the valve member attached to the outlet side of the valve is disposed to have a good opening and closing condition in the fluid path.
REFERENCES:
patent: 198501 (1877-12-01), Volkman
patent: 2630783 (1953-03-01), Reeve
patent: 5044396 (1991-09-01), Daudet et al.
patent: 5713389 (1998-02-01), Wilson, Jr. et al.
patent: 6019127 (2000-02-01), Orita et al.
Buiz Michael
Kanesaka & Takeuchi
Krishnamurthy Ramesh
Nifco Inc.
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