Abstract: An overfill protection device includes a piston (5) comprising a main seal or semi-sphere packing (3) on its tip and a V-shaped packing (4) on its side, a retracting spring (2) for pushing the piston back to its original position, a main valve (7) with an o-ring that drops into the inner hole of the retainer (10) to block off the gas flow, a level arm consisting of a rising faced section (28) and a U-shaped section (29), whereby no gas will be allowed to flow through the overfill protection device when the gas reaches the predetermined 80 percent level.

Abstract: An overfill protection device includes a piston (5) comprising a main seal or semi-sphere packing (3) on its tip and a V-shaped packing (4) on its side, a retracting spring (2) for pushing the piston back to its original position, a main valve (7) with an o-ring that drops into the inner hole of the retainer (10) to block off the gas flow, a level arm consisting of a rising faced section (28) and a U-shaped section (29), whereby no gas will be allowed to flow through the overfill protection device when the gas reaches the predetermined 80 percent level.

Abstract: A gas valve having a mechanism which prevents gas from flowing out. The check valve is installed at the opposite position of the safety valve, and has a supporting seat with a hollow body, the outer surface of which is threaded to hold on the gas inlet-outlet. The valve has a hollow body with the outer end being made as a shoulder, to attach closely with the inside of the supporting seat. At the inner end of the supporting seat is a piston that is preformed as one piece. It has one end as a hollow cylinder, and a number of holes surrounding the hollow cylindrical part to be the gas inlet-outlet of the gas valve. The other end is a circular flange larger than the hollow cylindrical part, with wings protruding to support the spring.

Abstract: A cooking gas valve having a mechanism which prevents gas from flowing out. The check valve is installed at the opposite position of the safety valve, and has a supporting seat with a hollow body, the outer surface of which is threaded to hold on the gas inlet-outlet. The valve has a hollow body with the outer end being made as a shoulder, to attach closely with the inside of the supporting seat. At the inner end of the supporting seat is a piston that is preformed as one piece. It has one end as a hollow cylinder, and a number of holes surrounding the hollow cylindrical part to be the gas inlet-outlet of the cooking gas valve. The other end is a circular flange larger than the hollow cylindrical part, with a wing protruding to support the spring.