Safety valve to release excess pressure from portable gas container for prevention of explosion

A safety valve (30) to release excess pressure from a portable gas container for the prevention of an explosion, in which a gas is discharged through a valve stem installed to penetrate a center of a mounting cup (10) connected to a top of the container and when the pressure inside the container is higher than a predetermined pressure, an excess pressure gas is released to the outside through the safety valve (30), the safety valve (30) comprising:

• a safety valve housing (31) with first and second diameter portions (311, 312) integrally formed in a cylindrical shape, the first and second diameter portions (311, 312) being different from each other in diameter;
• a shaft (32) with a body (321), a top projection (324) formed on a top of the body (321), a gas outflow portion (322) and a gasket locking portion (323) formed at a lower part of the body (321), the shaft (32) positioned inside the safety valve housing (31);
• a stopper (34) with a lower part being open, an upper part being closed except for a center where a through-hole is vertically formed, and a side wall vertically formed along an edge of the upper part to provide a space where the gas releases, wherein the stopper (34) is positioned so that the through-hole receives the top projection (324) and an outer circumferential surface of the side wall is secured to an inner circumferential surface of the first diameter portion (311) of the safety valve housing (31);
• a spring (33) fitted around the body (321) of the shaft (32) and positioned between the gas outflow portion (322) of the shaft (32) and the stopper (34):
• a first gasket (35) mounted on the safety valve housing and positioned between the first diameter portion (311) of the safety valve housing (31) and an excess pressure gas outlet (13) of the mounting cup (10), and
• a second gasket (36) positioned to be received around the gasket locking portion (323) formed at the lower part of the shaft (32), so that an upper part of the second gasket (36) is secured to a lower part of the gas outflow portion (322),
• wherein a valve stem housing (20) and the safety valve housing (31) are integrally formed and the excess pressure gas outlet (13) formed in the mounting cup (10) is positioned to the right or left of the center of the mounting cup (10), which is to be perpendicular to a line connecting the center of the mounting cup (10) and a notch (11).