Regulation 3.2 AUSTRALIA PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT ORIGINAL Name of Applicant: SCG (Thailand) Co, Ltd Actual Inventor: Jakaphan Kidprasert Address for Service: C/- MADDERNS, 1st Floor, 64 Hindmarsh Square, Adelaide, South Australia, Australia Invention title: COOKING GAS VALVE The following statement is a full description of this invention, including the best method of performing it known to us.
2 Description of Invention Title of Invention Cooking Gas Valve 5 Field of Invention Mechanical engineering related to a cooking gas valve Background of Invention A cooking gas valve generally has a problem of gas leak due to corrosion between a valve 0 surface and a valve shaft. When using it for a long time, the valve surface is corroded and not smooth, causing gas leak and then leading to wasting of gas. In addition, at the entrance and exit of the existing cooking gas valve, there is no a reverse exit flow prevention valve mechanism or back check module which prevents gas from flowing out the gas tank. Such prevention of gas leak must be effective even when the turning handle is turned on. In such situation, the gas [5 flowing out will flow back because there is a reverse flow prevention valve or back check module in closing the entrance and exit of the gas. Characteristics and Objectives of the Invention The cooking gas valve according to the present invention has a valve body of which the 20 uppermost side is provided with a spin disc for turning on and off the gas. The spin disc has a lower region provided with a thread for fitting and holding an upper inner surface of the valve body. A lower center core of the spin disc is provided with a transmission shaft moving up and down within an upper body of the valve body along the rotating direction inside the spin disc. A lower region of the transmission shaft is provided with grooves for receiving rubber O-rings. At 25 the lower side of the transmission shaft is provided with a disc plate moving up and down along with the movement of the transmission shaft to open and close the gas entrance and exit of the gas tank. One lateral side of the valve body is an aperture for installing a safety valve set in order to release pressure in the gas tank when the pressure inside the gas tank is higher than prescribed. At the lateral position opposite the aperture is provided with an aperture for installing a 30 reverse exit flow prevention valve mechanism comprising a receiving socket. The receiving 3 socket has a hollow body with a threaded outer surface for engaging and holding the thread inner surface of the aperture of the valve body. The outermost end of the receiving socket is provided with a seat tiltedly protruding inside slightly. The foremost region of the receiving socket is provided with a lock washer for inserting into the inner surface of the gas entrance and exit to 5 hold components of the reverse exit flow prevention valve mechanism from disengaging out of the gas entrance and exit. The back region of the receiving socket is provided with grooves for receiving rubber O-rings. The inner side of the receiving socket is inserted with a piston with one end formed into a hollow cylinder. The hollow cylindrical end has holes along its periphery to allow in and out flow 0 of gas within the cooking gas valve. The other end is in the form of a circular disc larger than the hollow cylinder with a protruding flange for receiving a spring. The seam between the cylindrical portion and the inner portion of the piston is provided with a groove for receiving a gasket to prevent gas leak from between the receiving socket and the piston. It is an object of the present invention to provide a reverse exit flow prevention valve [5 mechanism for a cooking gas valve to prevent gas leak from the gas tank. Such prevention of gas leak is effective even if the turning handle is turned on. In such situation, the gas flowing out will flow back because there is a reverse flow prevention valve closing the entrance and exit of the gas. Another object of the present invention is to provide security when removing the gas 20 filling device during gas filling operation where the operator forgets to close the gas valve on the gas user forget to close the valve on the tank when removing the pressure regulator from the valve. In such situation, the device of the present invention will help make the gas to stop flowing out because of the back check module or reverse flow prevention valve closing the gas exit of the gas. This helps reduce danger due to gas leak. 25 In addition, another object of the present invention is to provide security when an accident occurs during transportation. This may cause the turning handle to rotate suddenly by the force of impact to the pavement or turning accidentally by a human hand, causing a gas leak. The device according to the present invention helps make the leaking gas to flow back because there is a reverse flow prevention valve closing the entrance and exit of the gas. This helps reduce danger 30 from gas leak.
4 Brief Description of Drawings Fig. 1 shows an exploded view of the reverse exit flow prevention valve mechanism for the cooking gas valve according to the invention. Fig. 2 shows a lateral cross section exploded view of the reverse exit flow prevention 5 valve mechanism for the cooking gas valve according to the invention. Fig. 3 shows a lateral cross sectional three-dimension view of the cooking gas valve according to the invention. Fig. 4 shows a lateral cross sectional view of the cooking gas valve according to the invention. 0 Detailed Description of the Invention Fig. 1 and 2 show exploded views of the reverse exit flow prevention valve mechanism for the cooking gas valve according to the invention. This mechanism comprises a valve body 1 formed into a hollow body with the uppermost side of the valve body 1 provided with a spin disc 5 2 for turning on and off the gas flowing into the gas tank. The spin disc 2 has a lower region 3 provided with a thread for fitting and holding to the upper inner surface 4 of the valve body 1. The lower core of the spin disc 2 is provided with a transmission shaft 5 moving up and down within the upper body 6 of the valve body 1 along the rotating direction inside the spin disc 2. The transmission shaft 5 has a body similar to a long cylindrical rod with the lower diameter !0 larger than the upper diameter. The lower region of the transmission shaft 5 is provided with a number of grooves 7 for receiving rubber O-rings 8. The lower region of the transmission shaft 5 is provided with a disc plate 9 moving up and down along with the movement of the transmission shaft 5 to open and close the gas entrance and exit 10 of the gas tank. The disc plate 9 has a cylindrical body with the lower end slightly tapered inside and capable of fitting into the gas 25 entrance and exit 10 of the gas tank appropriately, and capable of moving up and down within the upper body 6 of the valve body 1 smoothly. This also helps facilitate gas filling for faster completion of the gas filling by using the principle of aerodynamic gas or air movement. The upper side of the disc plate 9 is provided with a protrusion 11 for inserting into the lower aperture of the transmission shaft 5 (not shown in Fig.).
5 One lateral side of the valve body 1 is provided with an aperture 12 for installing a safety valve set (not shown in Fig.) inside the cooking gas valve. This is generally used to release pressure inside the gas tank when the pressure inside the gas tank is higher than prescribed. At the lateral position opposite the aperture 12 is provided with an aperture 13 for 5 installing the reverse exit flow prevention valve mechanism 14 comprising a receiving socket 15. The receiving socket 15 has a hollow body with a threaded outer surface 16 for engaging and holding a threaded inner surface 17 of the aperture 13. The outermost end of the receiving socket 15 is provided with a seat 18 tiltedly protruding inside from the outermost end slightly. The foremost region of the receiving socket 15 is provided with a lock washer 19 for 0 inserting into the inner surface of the gas entrance and exit 20 to hold components of the reverse exit flow prevention valve mechanism 14 from disengaging out of the gas entrance and exit 20. The back region of the receiving socket 15 is provided with grooves 21 for receiving rubber 0 rings 22 to prevent gas leak from the inner surface of the aperture 13 and the receiving socket 15. The inside end portion of the receiving socket 15 is provided with a receiving seat 23 for 5 receiving a gasket 24 to prevent gas leak from between the receiving socket 15 and the piston 25. The inner side of the receiving socket 15 is inserted with the piston 25 integrally formed. The hollow cylindrical end 26 has a diameter corresponding to the center core size of the receiving socket 15 to enable appropriate fitting. The hollow cylinder 26 has a number of holes 27 along its periphery for use as a gas entrance and exit inside the cooking gas valve. The other 0 end 28 is in the form of circular disc larger than the hollow cylinder 26 and provided with a number of flanges 29 protruding from the side end portion 28 of the piston 25 for receiving springs 30. The seam between the hollow cylinder 26 and the side end portion 28 of the piston 25 is provided with a groove 31 for receiving a gasket 24 to prevent gas leak from between the receiving socket 15 and the piston 25. 25 Fig. 3 and 4 show lateral cross sectional views of the cooking gas valve according to the invention. The uppermost side of the valve body 1 is provided with a spin disc 2 for turning on and off the gas flowing into the gas tank. The lower region 3 of the spin disc 2 is provided with a thread for engaging and holding the upper inner surface 4 of the valve body 1. The lower core of the spin disc 2 is provided with a transmission shaft 5 moving up and down inside the upper body 30 6 of the valve body 1 along the rotating direction inside the spin disc 2. The lower region of the transmission shaft 5 is provided with a number of grooves 7 for receiving rubber O-rings 8. The 6 lower side of the transmission shaft 5 is provided with a disc plate 9 to be moved up and down along with the movement of the transmission shaft 5 for opening and closing the gas entrance and exit 10 of the gas tank. One lateral side of the valve body 1 is provided with an aperture 12 for installing a safety valve set to release pressure inside the gas tank when the pressure inside the gas tank is higher than 5 prescribed. At the lateral position opposite the aperture 12 is provided with an aperture 13 for installing a reverse exit flow prevention valve mechanism 14 comprising a receiving socket 15. The receiving socket 15 has a hollow body with a threaded outer surface 16 for engaging and holding a threaded inner surface 17 of the aperture 13. The outermost end of the receiving socket 15 is provided with a 0 seat 18 tiltedly protruding inside slightly. The foremost region of the receiving socket 15 is provided with a lock washer 19 for inserting into the inner surface of the gas entrance and exit 20 to hold components of the reverse exit flow prevention valve mechanism 14 from disengaging out of the gas entrance and exit 20. The back region of the receiving socket 15 is provided with grooves 21 for receiving rubber O-rings 22. The inside end 5 portion of the receiving socket 15 is provided with a receiving seat 23 for receiving a gasket 24. The inner side of the receiving socket 15 is inserted with the piston 25. The hollow cylindrical end 26 has a diameter corresponding to the center core size of the receiving socket 15. The hollow cylinder 26 has a number of holes 27 along its periphery for use as a gas entrance and exit inside the cooking gas valve. The other end 28 is in the form of circular disc larger than the hollow cylinder 26 !0 and provided with a number of protruding flanges 29 for receiving springs 30. The seam between the hollow cylinder 26 and the side end portion 28 of the piston 25 is provided with a groove 31 for receiving a gasket 24 to prevent gas leak from between the receiving socket 15 and the piston 25. The last object of the invention is the tapered seat. In general the valve seat of the valve body is protruded upward, the closing disk plate is flat. But for this invention, the valve seat is tapered. 25 Where is the closing disk plate is also tapered in order to close the valve seat. When filling, the resistance of flow is made to minimum because of the aerodynamic feature of this arrangement so the turbulence will not occure while filling. Thus the filling speed can be increase. The increase of flow through the tapered seat can offset the reverse exit flow prevention valve which obstruct the flow of gas. Thus the speed of filling can be maintained at a desirable range. 30 Best Mode of Invention As described in the Detailed Description of the invention.