FORM 2
THE PATENTS ACT 1970
[19 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10; rule 13] "A SOLENOID PURGE VALVE"
ADVIK HI-TECH PVT. LTD.
an Indian private Limited Company,
Plot No. B-5, Chakan Industrial Area, Phase II,
Village-Vasuli, Tal-Khed,
Dist-Pune, Pin-410501
Email: cie@advik.co.in
The following specification particularly describes the invention and the manner in
which it is to be performed.

FIELD OF INVENTION
[0001] The present invention relates to a purge valve, and more particularly the
present invention relates to the solenoid purge valve for evaporative emission control in vehicles.
BACKGROUND OF THE INVENTION
|0002] An emission of air pollutants such as hydrocarbons, carbon monoxide,
nitrogen oxide, sulphur oxide etc. in atmosphere have shown severe effects on health of living organism and environment. Escape of fuel vapours from the fuel tank of a vehicle is a major source of evaporative emission. In past few decades the evaporative emission standards have been introduced throughout the globe. The emission standards define the acceptable limit of■ release of air pollutants into atmosphere. To follow the emission standards set by the governments of respective countries the use of evaporative emission control device has become mandatory.
[0003] Such kind of device used to control the evaporative emission from a
vehicle is a solenoid purge valve. In evaporative emission control system fuel vapours inside the fuel tanks are allowed to be accumulated in the closed chamber called as canister. The solenoid purge valve is a device that allows fuel vapours that are stored in canister to transmit into engine through throttle body or carburettor. A solenoid purge valve is a one-way valve having normally closed condition. An electromechanical type solenoid purge valve operates on specific frequency range along with Duty ratio. It consists of an electromechanical arrangement for the actuation with ON-OFF mode or PWM operated proportional discharge mode. The electrical input is received from the ECU.
[0004] Referring to Fig. 1, the conventional solenoid purge valve (100) is
shown. Conventionally the solenoid purge valve includes a housing (110), a connector (110a), a cover (120) having an inlet port (120a) and an outlet port (120b), a coil assembly (130), a fixed core (140), a movable core (160), a sealing rubber (170), a spring (180) etc. When said solenoid purge valve (100) gets energized, the electromagnetic field get generated inside the housing (110). Due to

effect of said magnetic field the movable core (160) gets attracted towards the fixed core (140). As the movable core (160) gets attracted towards the fixed core (140), it opens the outlet (120b), that enables fuel vapours from canister to travel to engine due to vacuum creation in suction stroke.
|00051 Conventionally the movable core (160) is coaxially aligned with the
inlet port (120a).The movable core (160) remains abutted against the inlet port (120a) during the normally closed condition of the solenoid purge valve (100) and restricts the entry of fuel vapours inside the valve. The sealing means (170) is used to enhance sealing effect. When the solenoid purge valve gets energised the movable core (160) gets attracted towards the fixed core (140) so as to open the ' solenoid purge valve (100). As a result vapours accumulated in the canister enters the valve (100) through inlet port (120a) and travels towards the outlet port (120b) due to vacuum generated during suction stroke of engine. However, due to said vacuum the moving core (160) frequently gets tilted axially that further causes misalignment between the movable core (160) and the input port (120a). Said misalignment leads to degraded performance of valve (100) due to undesired leakage during closed state.
[0006] To overcome aforementioned drawbacks present in the conventional
solenoid purge valve, there is a need of the solenoid purge valve having improved leak-proof performance.
OBJECTS OF THE INVENTION
|0007] The main object of a present invention is to provide a solenoid purge
valve having improved leak proof performance.
|0008] The another object of the present invention is to provide the solenoid
purge valve that improves overall efficiency.
[0009] The another object of the present invention is to provide the solenoid
purge valve that is cost effective.

[00010] The another object of the present invention is to provide the solenoid purge valve with compact design.
SUMMARY OF THE INVENTION
(0001 lj The present invention relates to a purge valve, and more particularly the present invention relates to the solenoid purge valve for evaporative emission control in vehicles.
[00012] In embodiments of present invention a solenoid purge valve (200) includes a housing (210), a cover (220) having at least an inlet port (220a), a central port (220b) and outlet port (220c), the cover (220) coupled to the upper part of housing (210), a coil assembly (230) configured to be magnetized when power is supplied from a power source, a fixed core (240) configured to generate a magnetic field when the coil (230) is magnetized, a movable core (250) configured to get attracted towards the fixed core (240) when the coil (230) is magnetized and configured for opening and closing an inlet port (220a), a spring (260) configured to tightly move the movable core (250) towards the cover (220), a sealing means (270) configured to act as seal between the inlet port (220a) and outlet port (220c). The movable core operatively coupled to central port (220b) provides leakage proof performance. The central port (220b) directly coupled to outlet port (220c) provides leakage proof performance.
[00013] In one more embodiments of present invention the cover (220) configured for selectively communicate the inlet port (220a) with central port (220b) by a negative or vacuum pressure formed in the outlet port (220c).
(00014] In another embodiments of present invention the movable core (250) and the spring (260) are coaxially aligned with the central port (220b).
[00015] In another embodiments of present invention the movable core (250) is abutted against the central port (220b) during the normally closed condition so as to restrict entry of fuel vapours inside the valve.

[00016] In another embodiments of present invention the movable core configured for opening and closing of outlet port (220c).
[0001.7] In another embodiments of present invention said arrangement is configured to provide leakage proof performance.
[00018] In another embodiments of present invention due to vacuum generated during suction stroke of engine the central port sucks the movable core (250) tightly which avoids leakage.
[00019] In another embodiments of present invention the solenoid purge valve (200) configured to avoid leakage when the solenoid purge valve (200) is in OFF condition.
|00020| In another embodiments of present invention the movable core (250) resting against the surface of central port (220b) by spring force.
[00021] In another embodiments of present invention the movable core (250) and the spring (260) are coaxially aligned with the central port (220b).
BRIEF DESCRIPTION OF THE DRAWINGS
|00022] The accompanying drawings constitute a part of the description and are used to provide further understanding of the present invention. Such accompanying drawings illustrate the embodiments of the present invention which are used to describe the principles of the present invention together with the description.
|00023] Fig. 1 shows a cross sectional view of a conventional solenoid purge valve disclosed in the prior art; and
[00024| Fig. 2 shows a cross sectional view of a solenoid purge valve in accordance with the preferred embodiment of a present invention.

[00025] Fig. 3 shows a cross sectional view of a solenoid purge valve in accordance with the preferred embodiment of a present invention.
[00026] Fig. 4 shows resultant forces in accordance with the preferred embodiment of a present invention.
DETAILED DESCRIPTION OF THE INVENTION
[00027] As used in the description herein and throughout the claims that follow, the meaning of "a," "an," and "the" includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of "in" includes "in" and "on" unless the context clearly dictates otherwise.
[00028] If the specification states a component or feature "may", "can", "could", or "might" be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[00029] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This disclosure may however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
[00030] The present invention relates to a purge valve, and more particularly the present invention relates to the solenoid purge valve for evaporative emission control in vehicles.
[00031] Fig. 2 and Fig. 3 show a cross sectional view of a solenoid purge valve. (200) in accordance with the preferred embodiment of a present invention is shown. The solenoid purge valve (200) includes a housing (210) and a cover (220). The housing (210) includes a coil assembly (230), a fixed core (240), a movable core (250), a spring (260) and a sealing means (270). The cover (220) is having an inlet port (220a), a central port (220b) and outlet port (220c).

|00032] The movable core (250) and the spring (260) are coaxially aligned with the central port (220b). The movable core (250) is abutted against the central port (220b) during the normally closed condition so as to restrict entry of fuel vapours inside the valve. When the solenoid purge valve (200) gets energised the movable ■ core (250) gets attracted towards the fixed core (240) so as to open the solenoid purge valve (200). As a result vapours accumulated in the canister enters the valve (200) through inlet port (220a) and travels towards the outlet port (220c) through the central port (220b) due to vacuum generated during suction stroke of engine. The said arrangement is configured for improved leakage proof performance of the solenoid purge valve (200).
[00033| In embodiments of present invention a solenoid purge valve (200) includes a housing (210), a cover (220) having at least an inlet port (220a), a central port (220b) and outlet port (220c), the cover (220) coupled to the upper part of housing (210), a coil assembly (230) configured to be magnetized when power is supplied from a power source, a fixed core (240) configured to generate a magnetic field when the coil (230) is magnetized, a movable core (250) configured to get attracted towards the fixed core (240) when the coil (230) is magnetized and configured for opening and closing an inlet port (220a), a spring (260) configured to tightly move the movable core (250) towards the cover (220), a sealing means (270) may be but not limited to rubber and configured to act as seal between the inlet port (220a) and outlet port (220c), a periphery (280). The movable core operatively coupled to central port (220b) provides leakage proof performance. The central port (220b) directly coupled to outlet port (220c) provides leakage proof performance.
[00034] In one more embodiments of present invention the cover (220) configured for selectively communicate the inlet port (220a) with central port (220b) by a negative or vacuum pressure formed in the outlet port (220c).
[00035] In another embodiments of present invention the movable core (250) and the spring (260) are coaxially aligned with the central port (220b).

[00036] In another embodiments of present invention the movable core (250) is abutted against the central port (220b) during the normaliy closed condition so as to restrict entry of fuel vapours inside the valve.
[00037] In another embodiments of present invention the movable core configured for opening and closing of outlet port (220c).
[00038] In another embodiments of present invention said arrangement is configured to provide leakage proof performance.
[00039] In another embodiments of present invention due to vacuum generated during suction stroke of engine the central port sucks the movable core (250) tightly which avoids leakage.
1000401 In another, embodiments of present invention the solenoid purge valve (200) configured to avoid leakage when the solenoid purge valve (200) is in OFF condition.
|00041] In another embodiments of present invention the movable core (250) resting against the surface of central port (220b) by spring force.
[00042] In another embodiments of present invention the movable core (250) and the spring (260) are coaxially aligned with the central port (220b).
[00043] In another embodiments of present invention the central port (220b) directly coupled to outlet port (220c), The central port (220b) and outlet port (220c)
forms L shape.
»
|00044| The not limiting operational characteristics of the solenoid purge valve (200) explained here, when vapours accumulated in canister enters in inlet port (22Qa), enters in periphery (280) and travels to outlet port (220c) via central port (220b). Here during the vacuum generated by engine during suction stroke vacuum is generated in outlet port (220c) and central port (220b) therefore during power cut off or OFF condition of the solenoid purge valve (200) the movable core (250)

sucked tightly towards central port so that the vapours from inlet port do not enters in central port (220b) and outlet port (220c).
[00045] In another embodiments of present invention the movable core (250) and the spring (260) are coaxially aligned with the central port (220b).
|00046] In another embodiments of present invention the movable core (250) resting against the surface of central port (220b) by spring force.
[00047] Referring Fig. 3 of present invention, during the OFF condition of the solenoid purge valve (200) the spring force Fs acted on the movable core (250) and vacuum force Fv sucks the movable core (250) therefore the resultant force is (Fs + Fv) which gives better sealing effect.
[00048J In the above detailed description, reference is made to the accompanying drawings that form a part thereof, however, such description should not be considered as any limitation of scope of the present invention. The structure thus conceived in the present description is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence.
[00049] List of reference numerals:
1. A solenoid purge valve (200)
2. A housing (210)
3. A cover (220)
4. An inlet port (220a)
5. A central port (220b)
6. An outlet port (220c)
7. A coil assembly (230)

8. A fixed core (240)
9. A movable core (250)
10. A spring (260)
11. A sealing means (270)
12. Periphery (280)

CLAIMS:
We claim,
1. A solenoid purge valve (200) comprising:
a housing (210);
a cover (220) having at least: an inlet port (220a), a central port (220b),
outlet port (220c), a periphery (280), the cover (220) coupled to the upper
part of housing (210);
a coil assembly (230) configured to be magnetized when power is supplied
from a power source;
a fixed core (240) configured to generate a magnetic field when the coil
(230) is magnetized;
a movable core (250) configured to get attracted towards the fixed core
(240) when the coil (230) is magnetized and configured for opening and
closing an inlet port (220a);
a spring (260) configured to tightly move the movable core (250) towards
the cover (220); and
a sealing means (270) configured to act as seal between the inlet port (220a)
and outlet port (220c);
wherein movable core operatively coupled to central port (220b) provides
leakage proof performance;
wherein the central port (220b) directly coupled to outlet port (220c)
provides leakage proof performance.
2. The solenoid purge valve (200) as claimed in claim 1, wherein the cover (220) configured for selectively communicate the inlet port (220a) with central port (220b) by a negative or vacuum pressure formed in the outlet port (220c).
3. The solenoid purge valve (200) as claimed in claim 1, wherein the movable core (250) and the spring (260) are coaxially aligned with the central port (220b).

4. The solenoid purge valve (200) as claimed in claim 1, wherein the movable core
(250) is abutted against the central port (220b) during the normally closed condition
so as to restrict entiy of fuel vapours inside the valve.
5. The solenoid purge valve (200) as claimed in claim 1, the movable core
configured for opening and closing of outlet port (220c).
6. The solenoid purge valve (200) as claimed in claim 1, wherein said arrangement is configured to provide leakage proof performance.
7. The solenoid purge valve (200) as claimed in claim 1, wherein due to vacuum generated during suction stroke of engine the central port sucks the movable core (250) tightly which avoids leakage.
8. The solenoid purge valve (200) as claimed in claim 1, wherein the solenoid purge valve (200) configured to avoid leakage when the solenoid purge valve (200) is in OFF condition.
9. The solenoid purge valve (200) as claimed in claim 1, wherein the movable core (250) resting against the surface of central port (220b) by spring force.
10. The solenoid purge valve (200) as claimed in claim 1, wherein the spring force
Fs acted on the movable core (250) and vacuum force Fv sucks the movable core
(250) therefore the resultant force is (Fs + Fv) which gives better sealing effect.