FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10; rule 13] "A PRESSURE REGULATING DEVICE"
ADVTK 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 pressure regulating device and more
particularly to the pressure regulating device for compressed natural gas fuelled engines.
BACKGROUND OF THE INVENTION
[0002] The compressed natural gas as a fuel in automotive applications gaining
popularity due to several advantages. Compressed natural gas is considered good
for environment because there is less harmful emissions from compressed natural
/
gas fuelled vehicle engines.
[€003] The pressure regulation is very crucial requirement of compressed
natural gas engine. The Fig. 1 shows a pressure reduction system for compressed natural gas air cooled engine disclosed in the prior art.
[0004] The pressure reduction system (100) conventionally works in two
stages, namely first stage reduction and second stage reduction. In first stage reduction the pressure of compressed natural gas is reduced from 200 bar to 5 bar, wherein the second stage reduction said pressure is further reduced up to the range of I bar to 3 bar as per the requirement of the engine. In case of continuous running condition of engine there is an increased requirement of fuel flow. The increased fuel flow frequently causes icing of the pressure reduction system, that may further leads to undesired stoppage of vehicle. The hot water circulation is used in .the conventional pressure reduction system that increases complexity of system.
[0005] The another drawback of the conventional pressure reduction system is it suitable for low capacity engines up to 220cc. Also the system (100) is more complex due to requirement of multiple parts. The requirement of more number of parts makes system handling and installation difficult More number of parts may further cause leakage and hence safety issue.

[0006] Hence there is a requirement of compressed natural gas pressure regulating device that eliminates aforementioned drawbacks of conventional pressure reduction system.
OBJECTS OF THE INVENTION
[0007] The main object of a present invention is to provide a pressure regulating device for compressed natural gas fuelled engines.
|0008] The another object of the present invention is to provide the pressure regulating device that prevents the icing issue due to increased fuel flow requirement without the requirement of hot water circulation.
|0009| Yet another object of the invention is to provide the pressure regulating device that is compact in design.
[00010] Yet another object of the invention is to provide the pressure regulating device that is cost effective.
[00011] Yet another object of the invention is to provide the pressure regulating device that ensures safety of the engine as well as human safety.
SUMMARY OF THE INVENTION
[00012] In embodiment of present invention a pressure regulating device (200) includes a body (210) including a first stage chamber (210a), a second stage chamber (210b), the body (210) made up of but not limited to aluminium, at least one inlet (230) coupled to the body (210) and configured for the supply of gas to the first stage chamber (210a) and adapted to receive a high pressurised gas from a source, at least one outlet (240) coupled to the body and configured for supply of required low pressurised gas to an engine, a cover (220) coupled to the body (210), the cover made up of but not limited to aluminium, a plunger (230a) disposed in the inlet (230) and configured for supply of gas from the source, a diaphragm (280)

disposed between the body (210) and the cover (220), a first lever assembly (250) disposed inside the first stage chamber (210a) of the body (210), a second lever assembly (255) disposed inside the second stage chamber (210b), one end of the second lever assembly disposed in the body (210) and another end coupled to the diaphragm (280), a first spring (285) disposed on the top side of the diaphragm (280) and positioned by the cover (220) wherein one end of the first lever assembly (250) coupled to the diaphragm (280) and another end coupled the body (210), the first spring (285) may be but not limited to compression spring, a second spring (290) disposed on the another top side of the diaphragm (280) and positioned by the cover (220), the second spring (290) may be but not limited to compression spring, a screw (270) disposed on the cover (220), a safety relief valve (260) disposed on the body (210) and configured to release excess pressure in the first stage chamber (210a) due to failure of inlet (230), a solenoid valve (240a) disposed on the outlet (240) and configured to receive gas from the second stage chamber (210b), solenoid valve may be run by power unit, the power unit may be battery; and a spring guide (295) disposed between the cover (220) and the second spring (290). The pressure regulating device (200) configured to prevents the icing. The pressure regulating device (200) ensures safety of the engine as well as human safety and the pressure regulating device (200) having compact design.
[00013] In one more embodiment of present invention the plunger (230a) is controlled by first lever assembly (250) by applying the first spring (285) force.
[00014] In another embodiment of present invention the cover (220) coupled to the body (210) and configured to protect the body from outside environment.
[00015] In another embodiment of present invention a screw (270) configured for adjusting a pressure entered in the second stage chamber (210b) and by means of adjusting the screw (270) and to set the required outlet pressure about 1 bar to 3.5 bar.
[00016] In another embodiment of present invention o-ring, diaphragm and pad made up of elastic material but not limited to rubber.

[00017] In another embodiment of present invention the plunger (230a) includes a plunger housing (310) adapted to linearly move inside the inlet (230), a ball (320) operably disposed to one end of plunger housing (310) and configured to freely rotates at same end of the plunger housing (310) and a pad (330) disposed to another end of plunger housing (310). The ball having but not limited to circular cross section.
[00018] In another embodiment of present invention the plunger housing (310) having at least four across flat surfaces (350).
|00019] In another embodiment of present invention the plunger housing (310) having material but not limited to stainless steel or brass and configured to prevent the icing.
{00020] In another embodiment of present invention the having imaginary circle diameter (340) about 6 mm to 12 mm.
[00021] In another embodiment of present invention the pressure regulating device (200) providing constant outlet pressure.
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 conventional pressure regulating system disclosed in the prior art;
[00024| Fig. 2 shows a perspective view of a pressure regulating device in accordance with the preferred embodiment of a present invention; and

[00025] Fig. 3 shows a cross sectional view of a pressure regulating device in accordance with the preferred embodiment of a present invention.
[00026] Fig. 4 shows an exploded view of a pressure regulating device in accordance with the preferred embodiment of a present invention.
[00027] Fig. 5 shows a pressure regulating device in accordance with the preferred embodiment of a present invention.
[00028] Fig. 6 shows a plunger of a pressure regulating device in accordance with the preferred embodiment of a present invention.
|00029] Fig. 7 shows a graphical representation of inlet pressure (bar) versus outlet pressure (bar) of a pressure regulating device in accordance with the preferred embodiment of a present invention.
DETAILED DESCRIPTION OF THE INVENTION
[00030] 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.
[00031] 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.
[00032] 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.
[00033| Fig. 2 and Fig. 3 show a perspective view and a cross sectional view of a pressure regulating device respectively in accordance with a preferred embodiment of a present invention. The pressure regulating device (200) includes

a body (210), a first stage chamber (210a), a second stage chamber (21 Ob), a cover (220), an inlet assembly (230), an outlet (240), a solenoid valve (240a), a first lever assembly (250a), a second lever assembly (250b), a safety relief valve assembly (260), a screw (270), A diaphragm (280), a first spring (285), a second spring (290) and a spring guide (295),
[00034] Referring Fig. 4, Fig 5 and Fig 6, in embodiment of present invention a pressure regulating device (200) includes a body (210) including a first stage chamber (210a), a second stage chamber (210b), the body (210) made up of but not limited to aluminium, at least one inlet (230) coupled to the body (210) and configured for the supply of gas to the first stage chamber (210a) and adapted to receive a high pressurised gas from a source, at least one outlet (240) coupled to the body and configured for supply of required low pressurised gas to an engine, a cover (220) coupled to the body (210) by fastening means, the fastening means may be but not limited to screws, the cover made up of but not limited to aluminium, a plunger (230a) disposed in the inlet (230) and configured for supply of gas from the source, a diaphragm (280) disposed between the body (210) and the cover (220), a first lever assembly (250) disposed inside the first stage chamber (210a) of the body . (210), a second lever assembly (255) disposed inside the second stage chamber (210b), one end of the second lever assembly disposed in the body (210) and another end coupled to the diaphragm (280), a first spring (285) disposed on the top side of the diaphragm (280) and positioned by the cover (220) wherein one end of the first lever assembly (250) coupled to the diaphragm (280) and another end coupled the body (210), the first spring (285) may be but not limited to compression spring, a second spring (290) disposed on the another top side of the diaphragm (280) and positioned by the cover (220), the second spring (290) may be but not limited to compression spring, a fastener (270) may be but not limited to screw disposed on the cover (220), a safety relief valve (260) disposed on the body (210) and configured to release excess pressure in the first stage chamber (210a) due to failure of inlet (230), a solenoid valve (240a) disposed on the outlet (240) and configured to receive gas from the second stage chamber (210b), solenoid valve

may be run by power unit, the power unit may be battery; and a spring guide (295) disposed between the cover (220) and the second spring (290). The pressure regulating device (200) configured to prevents the icing. The pressure regulating device (200) ensures safety of the engine as well as human safety and the pressure regulating device (200) having compact design.
[00035] In one more embodiment of present invention the plunger (230a) is controlled by first lever assembly (250) by applying the first spring (285) force.
|00036] In another embodiment of present invention the cover (220) coupled to the body (210) and configured to protect the body from outside environment.
|00037] In another embodiment of present invention a screw (270) configured for adjusting a pressure entered in the.second stage chamber (210b) and by means of adjusting the screw (270) and to set the required outlet pressure about 1 bar to 3.5 bar.
[00038] In another embodiment of present invention o-ring, diaphragm and pad made up of elastic material but not limited to rubber.
[00039] In another embodiment of present invention the plunger (230a) includes a plunger housing (310) adapted to linearly move inside the inlet (230), a ball (320) operably disposed to one end of plunger housing (310) and configured to freely rotates at same end of the plunger housing (310) and a pad (330) disposed to another end of plunger housing (310). The ball having but not limited to circular cross section.
[00040] In another embodiment of present invention the plunger housing (310) having at least four across flat surfaces (350).
[00041| In another embodiment of present invention the plunger housing (310) having material but not limited to stainless steel or brass and configured to prevent the icing.

[00042] In another embodiment of present invention the having imaginary circle diameter (340) about 6 mm 'to 12 mm.
[00043] In another embodiment of present invention the pressure regulating device (200) providing constant outlet pressure,
[00044] Again referring Fig 4, illustrates a schematic view of a spring loaded a pressure regulating device in accordance with an embodiment of the invention. The pressure regulating device (200) includes a Body (210), a first stage chamber (210a), a cover (220), an inlet (230), an outlet (240), a solenoid Valve (240a), a first lever assembly (250), a second lever assembly (255), a safety relief valve assembly (260), a screw (270), a diaphragm (280), a first spring (285), a second spring (290), a spring guide (295) and a plunger (230a).
[00045] The inlet (230) is connected to the body (210), for the supply of gas to a first stage chamber (210a) from source. The source may be gas cylinder having compressed natural gas. The inlet (230) of a pressure regulating device (200) is positioned to control the fluid demand of a system under consideration and to maintain the required regulated pressure of the system.
[00046] In the present invention, a pressure regulating device (200) includes a plunger (230a) positioned within the inlet (230) of the supply gas. A first lever assembly (250) is fixed inside the first stage chamber (210a) of body (210). A movement of a Plunger (230a) is controlled by first lever assembly (250) by applying the first spring (285) force. One end of first lever assembly (250) is connected with diaphragm (280) and another end is fitted on a body (210). A first spring (285) is placed on the top side of a diaphragm (280) and positioned by cover (220).
[00047| A non-limiting operational characteristics of pressure regulating device (200) explained, a gas from source enters in the inlet (230), this gas passed to the first stage chamber (210a), after entering the gas in a first stage chamber (210a), pushes the diaphragm (280) upward to accumulate the incoming gas.

Further, the first lever assembly (250) blocks the gas path by means closing the incoming flow of gas by pushing plunger (230a). At the same time, the spring (285) force acts on the diaphragm to push it down to balance the pressure of the first stage chamber (210a). The inlet (230) for the gas path is designed in such a way that icing does not occur even if the flow requirement on the downstream side increases. Hence, drawbacks observed in prior art are eliminated in this present invention.
|00048] A safety relief valve (260) has been provided on the body (210) to release excess pressure in the first stage chamber due to failure of inlet (230) side components.
|00049| A gas with specific pressure passes from the first stage chamber (210a) to a second stage chamber (210b) through an orifice by opening a second lever assembly (255). One end of a second lever assembly is fixed in the Body (210) and another end is coupled with a Diaphragm (280).
[00050] This specific pressure entered in the second stage chamber (210b) and adjusted by means applying a Spring (290) force via adjusting the screw (270) fitted on cover (220) to set the required outlet pressure, that is 1 ~ 3.5 bar.
[00051] This adjusted pressure (outlet pressure) fed to the downstream system by a Solenoid valve (240a) mounted on the outlet port (240). The outlet (240) is provided in the body (210) through which the supply gas at controlled pressure exits. The inlet (210) and the outlet (240) arc parallel to each other located on a Body (210).
|00052| The pressure regulating device (200) with first spring (285) loading on diaphragm (280) to set the pressure in operation. A pressure regulating device (200) is a system used for maintaining constant pressure at the downstream by adjusting spring force by means of adjusting screw (270). A pressure regulating device is designed to achieve variable outlet pressure (240) manually. The set pressure is the

outlet pressure of the regulator which is decided by the reference load acted on diaphragm by adjusting the adjusting screw (270).
[00053] The pressure regulating device (200) is configured to reduce high
pressure generally in the range of 200 bar in two stages up to the range of 1 bar to 3.5 bar as per requirement of engine. The pressure regulating device is configured to prevent icing of the pressure regulating device during increased flow requirement from the engine. The pressure regulating device (200) is suitable for the air cooled engine up to capacity of 400cc. Due to compact design the pressure regulating device (200) provides ease for handling and installation.
[00054] A not limiting results for the pressure regulating device (200) as follows:

Sr. No. Inlet Pressure (Bar) Output Pressure (Bar)
1 0 0
2 40 2
3 80 2
4 120 2
5 160 2
6 200 2.2
1000551 ADVANTAGES
1. The pressure regulating device (200) is configured to reduce high pressure generally in the range of 200 bar in two stages up to the range of 1 bar to 3.5 bar as per requirement of engine.
2. Construction of the inlet assembly (230) is made so as to sustain high pressure up to 200 bar.
3. The pressure regulating device is configured to prevent icing of pressure
regulating device during increased flow requirement from engine without
the requirement of hot water circulation.

4. Compact design of the pressure regulating device provides ease for handling and installation.
5. System working with single diaphragm for both stages for pressure reduction.
6. The pressure regulating device is suitable for air cooled engine having capacity up to 400 cc
7. Battery operated solenoid valve as an integrated part of the pressure regulating device fitted at the outlet (240) as a safety feature.
[00056] 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.
[00057] List of reference numerals:
1. A pressure regulating device (200);
2. A body (210);
3. A first stage chamber (210a);
4. A second stage chamber (210b);
5. A cover (220);
6. An inlet assembly (230);
7. An outlet (240);
8. A solenoid valve (240a)
9. A first lever assembly (250);
10. A second lever assembly (255);
11. A safety relief valve assembly (260)
12. A screw (270);
13. A diaphragm (280);
14. A first spring (285);

15. A second spring (290);
16. A spring guide (295)
17. A plunger housing (310)
18. A ball (320)
19. A pad (330)
20. Imaginary circle diameter (340)
21. Across flat surface (350)

CLAIMS We Claim,
1. A pressure regulating device (200) comprises: a body (210) having:
a first stage chamber (210a);
a second stage chamber (210b); at least one inlet (230) coupled to the body (210) and configured for the supply of gas to the first stage chamber (210a) and adapted to receive a high pressurised gas from a source;
at least one outlet (240) coupled to the body and configured for supply of required low pressurised gas to an engine; a cover (220) coupled to the body (210) by fastening means; a plunger (230a) disposed in the inlet (230) and configured for supply of gas . from the source;
a diaphragm (280) disposed between the body (210) and the cover (220); a first lever assembly (250) disposed inside the first stage chamber (210a) of the body (210); .
a second lever assembly (255) disposed inside the second stage chamber (210b) wherein one end of the second lever assembly disposed in the body (210) and another end coupled to the diaphragm (280); a first spring (285) disposed on the top side of the diaphragm (280) and positioned by the cover (220) wherein one end of the first lever assembly (250) coupled to the diaphragm (280) and another end coupled the body (210);
a second spring (290) disposed on the another top side of the diaphragm (280) and positioned by the cover (220); a fastener (270) disposed on the cover (220);
a safety relief valve (260) disposed on the body (210) and configured to release excess pressure in the first stage chamber (210a) due to failure of inlet (230);

a solenoid valve (240a) disposed on the outlet (240) and configured to
receive gas from the second stage chamber (210b); and
a spring guide (295) disposed between the cover (220) and the second spring
(290);
wherein pressure regulating device (200) configured to prevents the icing;
wherein the pressure regulating device (200) ensures safety of the engine as
well as human safety; and
wherein the pressure regulating device (200) having compact design.
2. The pressure regulating device (200) as claimed in claim 1, wherein a plunger (230a) is controlled by first lever assembly (250) by applying the first spring (285) force.
3. The pressure regulating device (200) as claimed in claim 1, wherein the cover (220) coupled to the body (210) and configured to protect the body from outside environment.
4. The pressure regulating device (200) as claimed in claim 1, wherein a fastener may be screw (270) configured for adjusting a pressure entered in the second stage chamber (210b) and by means of applying spring (290) force via adjusting the screw (270) and to set the required outlet pressure about I bar to 3.5 bar.
5. The pressure regulating device (200) as claimed in claim 1, wherein o-ring, diaphragm and pad made up of elastic material but not limited to rubber.
6. The pressure regulating device (200) as claimed in claim 1, wherein the plunger (230a) comprises:
a plunger housing (310) adapted to linearly move inside the inlet (230); a ball (320) operably disposed to one end of plunger housing (310) and configured to freely rotates at same end of the plunger housing (310); and ■ a pad (330) disposed to another end of plunger housing (310).
7. The plunger (230a) as claimed in claim 6, wherein the plunger housing (310)
having at least four across flat surfaces (350).

8. The plunger (230a) as claimed in claim 6, wherein the plunger housing (310) having material but not limited to stainless steel or brass and configured to prevent the icing.
9. The plunger (230a) as claimed in claim 6, wherein the having imaginary circle diameter (340) about 6 mm to 12 mm.
10. The pressure regulating device (200) as claimed in claim 1, wherein the pressure
regulating device (200) providing constant outlet pressure.