Zhongshan City, Guangdong Evergreen Gas Valve Co., Ltd. developed the "gas stove safety valve force device" recently passed the expert appraisal. The device adopts a cam pushing and a compensating spring in front of the plunger to buffer the force acting on the electromagnetic valve to ensure uniform stroke and force of the top opening electromagnetic valve and reduce the damage to the electromagnetic valve. Cam using powder metallurgy products, improve the cam accuracy and wear resistance, help to improve the life of the safety valve. Finally, the appraisal committee experts suggested that a series of products should be further developed to meet the diversified needs of the market.