FIELD OF INVENTION
This invention relates to an automatic fuel valve for fuel supply system of a
tractor.
BACKGROUND/PRIOR ART OF THE INVENTION
Fuel supply system for a tractor is known to have been provided, wherein the
valve is manually operated. In this system (as shown in fig. 1), fuel flows from
reservoir (Fuel Tank) (1) to FIP (2) through supply line (3). FIP further controls
the quantity 86 timing of fuel to be injected into the cylinders. Fuel valve (4) is
usually provided at the connection point of supply pipe with fuel tank.
Conventional fuel valve (as shown in fig. 2) having provision to open or close
the fuel supply from fuel tank by rotating the fuel valve knob (K) as 85 when
required. As indicated in the figure 2, the valve is provided with a fuel inlet
filter (I) and fuel outlet (O). 'Open' condition is used during operation of tractor.
During this condition, the path for fuel supply is open 86 fuel flows to supply
line by gravity. 'Close' condition is used while dismantling the fuel system
during service so as to avoid the fuel point or drainage. During this condition,
rotated fuel valve knob blocks the path of fuel flow inside valve housing. Hence,
this system requires manual operation as per requirement.
Therefore, it is required to develop an automatic fuel valve for fuel supply
system of a tractor wherein the valve automatically opens the fuel supply to FIP
with starting of engine and closes the same when engine is shut down.
OBJECTS OF THE INVENTION
The primary object of the present invention is to provide an automatic fuel
valve for fuel supply system of a tractor which overcomes disadvantage(s)
associated with the prior art.
, 1
-3-
Another object of the present invention is to provide an automatic fuel valve for
fuel supply system of a tractor which eliminates the manual operation of valve
to open and close the fuel supply.
Further object of the present invention is to provide an automatic fuel valve for
fuel supply system of a tractor which reduces the chances of fuel theft.
Yet another object of the present invention is to provide an automatic fuel valve
for fuel supply system of a tractor which makes tractor operation more
comfortable and safer than conventional one.
SUMMARY OF INVENTION
According to this invention, there is provided an automatic fuel valve for fuel
supply system of a tractor comprising of a base and upper body with a
diaphragm provided therebetween, wherein the base is provided with a suction
port and said upper body is provided with fuel inlet filter and fuel outlet.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent from
the ensuing description when read in conjunction with the accompanying
drawings and wherein:
Fig. 1 shows: conventional fuel supply system of tractor.
Fig. 2 shows: conventional fuel valve.
Fig. 3 shows: vacuum operated fuel valve.
, . -4-
Fig. 4 shows: exploded view of automatic fuel valve according to the present
invention.
DETAIL DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE
ACCOMPANYING DRAWINGS:-
The present invention discloses an automatic fuel valve for fuel supply system
of a tractor comprising of a lower body/base and upper body with a diaphragm
therebetween, position of which is retained by a resilient means.
Reference may be made to fig. 1 and 2 indicating conventional fuel system of
tractor and conventional fuel valve, which have already been discussed.
Now, reference may be made to fig. 3 and 4.
The instant invention directing to an automatic fuel valve for fuel supply
system is provided with a base (B) and upper body (U). Further, a diaphragm is
disposed between the upper body (U) and base (B).
However, position of said diaphragm is retained with the help of a resilient
means as shown in fig. 4.
The aforesaid valve is provided with fuel inlet filter (2) at one end and fuel
outlet (3) at other end together with a suction port (1) as shown in fig. 3.
The fuel inlet filter is inserted into fuel tank, fuel from which enters the valve
through said filter.
Fuel outlet is connected to supply line for transferring fuel to FIP.
Suction port (1) transfers suction pressure to the diaphragm (D) through a hole
of the port. The diaphragm keeps the fuel hole closed unless pulled downward
by means of negative pressure during suction stroke.
Said resilient means (R) such as spring retains the position of diaphragm to
keep fuel hole closed prior to and after suction stroke.
•
-5-
The upper body provides path for fuel during suction stroke. Said upper body
is provided with fuel inlet filter (2) and fuel outlet (3).
Said suction port (1) is connected to air inlet manifold of engine through pipe.
It transfers suction pressure of inlet manifold to the diaphragm. Said lower
body transfers suction pressure to diaphragm through marked hole.
The material of lower body/upper body of the fuel valve is preferably Zinc (zn).
The spring is made of material such as spring steel and said diaphragm is
made of material such as nylon without restricting scope of the invention to the
same.
Thus, other materials readily apparent to the person skilled in the art are
understood to be within scope of the invention.
Thus, this invention is directed to an automatic fuel valve which opens the fuel
supply from Fuel Tank to FIP during every suction stroke of engine &, keeps it
closed during all other conditions like engine shut down. Thus, the present
invention reduces the probability of fuel theft as fuel cannot flow out in supply
line in tractor shut down condition, while it is so inconvenient to collect fuel
directly by dismantling fuel valve.
It is to be noted that the present invention is susceptible to modifications,
adaptations and changes by those skilled in the art. Such variant embodiments
employing the concepts and features of this invention are intended to be within
the scope of the present invention, which is further set forth under the
following claims:-

WE CLAIM:
1. An automatic fuel valve for fuel supply system of a tractor comprising of
a base and upper body with a diaphragm provided therebetween, wherein
the base is provided with a suction port and said upper body is provided
with fuel inlet filter and fuel outlet.
2. An automatic fuel valve as claimed in claim 1, wherein position of said
diaphragm is retained by a resilient means.
3. An automatic fuel valve as claimed in claim 1 or 2, wherein the suction
port transfers suction pressure to the diaphragm through a hole of said
port.
4. An automatic fuel valve as claimed in any of the preceding claims,
wherein said suction port is connected to air inlet manifold of engine
through a pipe, which transfers suction pressure of inlet manifold to the
diaphragm.
5. An automatic fuel valve as claimed in any of the preceding claims,
wherein the diaphragm keeps the fuel hole closed unless pulled
downward by means of negative pressure during suction stroke.
6. An automatic fuel valve as claimed in any of the preceding claims,
wherein said resilient means such as spring keeps fuel hole closed prior
to and after suction stroke.
I
I
-7-
7. An automatic fuel valve as claimed in any of the preceding claims,
wherein said upper body having fuel inlet filter and fuel outlet provides
path for fuel during suction stroke.
8. An automatic fuel valve as claimed in any of the preceding claims,
wherein said lower body transfers suction pressure to diaphragm
through marked hole.
9. An automatic fuel valve for fuel supply system of a tractor substantially
as herein described with reference to the accompanying drawings.