Claims:1. A valve unit without core comprising of an upper body of the coreless valve unit (1), lower body of the coreless valve unit (2), axial vertical fluid passage (5), sealing washer (3), cross hole for fluid passage (6), retractable spring or spring loaded diaphragm or elastic member(4).

2. The valve unit without core as claimed in claim 1, wherein the upper body (1) further comprises of through hole (5) which acts as the fluid passage.

3. The valve unit without core as claimed in claim 1, wherein the lower body (2) also comprise of a cross-hole (6).

4. The valve unit without core as claimed in claim 1 further comprises of a sealing washer (3) for retaining the fluid within the system.

5. The valve unit without core as claimed in claim 1 and claim 4, wherein the sealing washer (3) comprises of metal, polymer, elastic material, or any hybrid material in combination depending upon the media of fluid and compatibility.

6. The valve unit without core as claimed in claim 1, wherein the retractable spring or diaphragm or elastic member (4) is functionally equipped to hold the sealing washer (3) in place and also for quick movement of the sealing washer (3) to its original position.

7. The valve unit without core as claimed in claim 1, wherein the coreless valve unit involves the following steps of working mechanisms while inflating the system with fluid

- the fluid filling attachment will be connected to the top of the valve and the fluid filling attachment will enforce high pressure fluid into the valve;

- this high pressure fluid will push the sealing washer (3) down against the spring (4);

- once the sealing washer (3) starts to descend because of fluid pressure, the fluid passage will open and once the sealing washer (3) goes below the cross-hole (6) provided in the lower body (2), the fluid will start to flow inside the system;

- after filling the required quantity of fluid into the system, the fluid filling attachment is removed;

- now the sealing washer (3) is pushed back to its original position by the spring (4) and the fluid pressure from the system also assists this movement of the sealing washer (3);

- once the sealing washer (3) is back in its original position, the fluid passage is closed and sealing takes place, thus retaining the fluid within the system, without any leakage and the fluid can be filled by either physically pushing the washer down by means of a pin, or just with sufficient fluid pressure.

8. The valve unit without core as claimed in claim 1, wherein the coreless valve unit utilizes a sealing washer having various shapes like square, rectangular, round, A shaped, umbrella shaped etc. .

9. The method of working of a valve unit without core wherein the sealing washer (3) moves up and down inside the valve to close and open the valve and provide an effective retraction after charging the system.
, Description:FIELD OF THE INVENTION:

[001] The present invention relates to the field of charging valves and more specifically to a valve unit for valve without core. The present invention provides a coreless valve unit for various applications such as tire industry, HVAC systems, fire extinguisher, petroleum industries, etc. The present invention further provides means to hold the medium inside the system without any leakage.

BACKGROUND OF THE INVENTION:
[002] There are various types of valve systems for various applications available in the market. Most of the valve systems have valve core to retain the media within the system. The design and manufacturing of the core requires high precision, engineering, machine tools and huge research and development. A typical valve assembly consists of valve housing and valve core, which when depressed, allows the media to enter into the system and retains the same within the system.

[003] Patent No.: CN 2299740Y discloses a piston-type tire inflating valve plunger, which relates to an inflating device installed in a vehicle tire air valve and used for inflating and sealing tires. The piston-type tire inflating valve plunger is composed of an air inlet pipe and a piston. The upper end of the air inlet pipe is open, and the lower end is provided with a piston cavity. The middle part of the air inlet pipe is provided with an air valve, air inlet holes are arranged at the bottom and the side walls of the piston cavity. The piston which is cylindrical is installed in the piston cavity and can move up and down in the piston cavity. A disadvantage of this design is that float movement mainly depends on the system pressure. There are no external supporting mechanisms provided for the movement of the float. Hence, if the system pressure drops below atmospheric pressure, the float might drop down automatically and cause failure of the valve and system.

[004] Patent No.: US4294301A discloses a valve for a tubeless tire which is adapted to be secure in a bore of a tire rim comprises a tubular valve body with an outer rim surface engagement flange formed on its periphery and spaced from an inner rim surface engagement flange by the length of the bore through the tire rim. At least one of the outer or inner rim surface engagement flanges is deformed by engagement with the associated tire rim surface. Preferably, a sleeve of a soft material is located around the body between these flanges and it is deformed and compressed into a groove formed by the respective flanges over each surface of the tire rim. The shape of the valve body may be most simple and may be designed for receiving any of the conventional or new valve cores. The valve body can be fixed to the wheel-rim with the aid of a relatively simple tool.

[005] WIPO Publication No.: WO1989009700A1 discloses a pressure indicating valve stem for a pneumatic tubeless tire comprising of an elastomeric base which snap-fits into the valve aperture of a wheel rim or is clamped and supports a rigid mounting sleeve in which a valve core holder is telescopically slideable. Sealing means, being an elastomeric diaphragm, extended from base to core holder and itself provides all of the elastic restraint on the movement of the core holder.

[006] Valves are used for charging or discharging the system with fluid. The existing technology includes valve housing and valve core. Valve housing is the outer body of the valve, while valve core is a non-return valve used for charging and retaining the medium within the system. Valve core is typically an assembly of six or seven child parts and is very complex in nature, which includes two different types of polymer sealing. The design of the valve core is very complex and involves very close tolerances. High precision manufacturing machinery with high accuracy is required for producing a valve core. Also, since the sealing is the most critical part of the valve core, this design becomes even more complex. A slight difference in this seating position causes leakage problems.

[007] As mentioned above, there are multiple drawbacks of presently available valve system in market and there is a need to overcome these difficulties. The present invention has designed a new type of valve unit, which does not have a core. This design is simple, consists of few parts and is thus cost effective, easy to design, manufacture and assemble for the respective industries.

OBJECTIVE OF THE INVENTION:

[008] The primary objective of this invention is to provide a coreless valve unit, wherein the core assembly of a standard valve core is eliminated.

[009] Another objective of the present invention is to provide a coreless valve unit with fewer parts to make the valve operation, manufacturing and assembly simple.

[010] Yet another objective of the present invention is to provide a coreless valve unit, in which a sealing member is made of a polymer, metal, elastic material, any hybrid material, or combination of two materials. Depending on the application, the sealing member can be suitably designed to provide adequate sealing required.

[011] A further objective of the present invention is to provide a coreless valve with spring member that can be sealed and shut utilizing the pressure of the fluid contained in order to assist with the sealing.

[012] A coreless valve can be of dimensions that are similar to the existing valves available in the market. The material of the valve body can be a variety of metals, polymer, plastic material, elastic material, any hybrid material or combination of two or more materials depending on the application.

SUMMARY OF THE INVENTION:

[013] Accordingly, the present invention provides a valve unit without core. The valve unit consists of: an upper body of the coreless valve unit, a lower body of the coreless valve unit, vertical fluid passage hole, sealing member, cross hole for fluid passage, retractable spring member or a spring loaded diaphragm or elastic member.

BRIEF DESCRIPTION OF THE DRAWINGS:

[014] The advantages and features of the present invention will be better understood with reference to the following detailed description taken in conjunction with the accompanying drawings, in which:
Figure- 1 illustrates a cut section and/or cross sectional view of the coreless valve unit;
Figure- 2 illustrates another variant of this concept with an elastic member in place of spring;
Figure- 3 illustrates another variant of this concept with diaphragm type of float;
Figure- 4 illustrates yet another variant of this concept with T-shaped float. This float can be designed in a variety of shapes.

DETAILED DESCRIPTION OF THE DRAWINGS:

[015] In the following description, for purpose of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details.

[016] One embodiment of the present invention provides a coreless valve unit. According to Fig. 1 the coreless valve unit of the present invention consists of: upper body of the coreless valve unit (1), lower body of the coreless valve unit (2), vertical fluid passage hole (5), sealing washer (3), cross hole for fluid passage (6), retractable spring (4)

[017] Fig. 2 shows a variant of this concept. The variant consists of upper body of the coreless valve unit (1), lower body of the coreless valve unit (2), vertical fluid passage hole (5), sealing washer (3), cross hole for fluid passage (6) and an elastic member (4). The stiffness and material of the elastic member can be selected depending upon the working condition of the system, i.e. temperature, pressure, environmental condition, etc.

[018] Fig. 3 shows another variant of this concept. The coreless valve unit consists of upper body of the coreless valve unit (1), lower body of the coreless valve unit (2), vertical fluid passage hole (5), sealing washer (3), cross hole for fluid passage (6) and diaphragm (4). This diaphragm can be made of various polymers, plastic, metal, elastic material, any hybrid material, or combination of two or more materials. This variant is also provided with a cap. This cap can be of dust type or seal type. Depending upon the application, environmental condition, it may be threaded type or plug-in type or press-fit type or locking type. The cap can be made of a variety of materials like metals, polymers, plastic, elastic members, hybrid or a combination of two or more materials.

[019] Fig. 4 shows yet another variant of this concept. This consists of float made of hybrid material or combination of two or more materials. While charging the system, the charging attachment will be connected to the top of the valve. The charging attachment will enforce high pressure fluid into the valve. This high pressure fluid medium will push the sealing washer (3) down against the spring (4). Once the sealing washer (3) starts to descend because of the fluid pressure, the fluid passage will get opened and once the sealing washer (3) goes below the cross-hole (6) provided in the lower body (2), the fluid will start to flow inside the system. After filling the required quantity of fluid into the system, the charging attachment will be removed. The sealing washer (3) will be pushed back to its original position by the spring (4). The fluid from the system will also assist this movement of the sealing washer (3). Once the sealing washer (3) is back in its original position, the passage is closed and sealing takes place, thus retaining the fluid within the system, without any leakage. The fluid can be filled by either physically pushing the washer down by means of a pin, or just with sufficient fluid pressure.

[020] Yet another embodiment of present invention is that the material of the coreless valve body can be various polymer, plastic, metal, elastic material, any hybrid material, or combination of two or more materials depending on the application and along with this the coreless valve unit also may be plated or un-plated or chemically treated.

[021] Yet another embodiment of the present invention is that the sealing washer (3) can also be made from various polymer, metal, elastic material, plastic material, any hybrid material, or combination of two or more materials depending upon the media of gas and compatibility. Washer or float can be of any shape say rectangular, square, circular, t-shaped, A-shaped, Umbrella shaped etc.

[022] Yet another embodiment of the present invention is that another variant of this coreless valve unit is in the form of one-piece or two-piece body. This concept can be used for both Snap-in and Clamp-in and brazed types of systems. Also, this concept can be used for tube type tires. This concept can also be used in the various other domains to retain the pressurized medium in the system

[023] The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention. Another variant of this design includes an elastic member instead of spring grouted to the float. The stiffness and material of the spring or elastic member can be selected depending upon the working condition of the system. Another variant of this design includes usage of various types of caps. This cap can be of dust type or seal type. Depending upon the application, environmental condition, it may be threaded type or plug-in type or press-fit type or locking type. The cap can be made of a variety of materials like metals, polymers, plastic, elastic members, hybrid or a combination of two or more materials. Yet another variant of this design includes diaphragm in place of spring. This diaphragm can be made of various polymers, plastics, metals, elastic material, any hybrid material, or combination of two or more materials