Gas valve and gas burner system

A gas valve for a gas appliance and communicating with a gas source via a gas pipe, wherein the gas valve comprising:

• an inlet channel communicating with the gas pipe;
• a check valve body disposed in the inlet channel of the gas valve and comprising an elastic member and a sealing member, wherein the elastic member provides a supporting force to the sealing member to block the inlet channel;
• wherein when gas flows toward the gas valve, the gas flow provides a force against the supporting force to move the sealing member, thereby allowing the gas to flow through the check valve body;
• wherein the inlet channel has a shoulder;
• a side of the sealing member abuts against the shoulder, and another side of the sealing member is urged by the elastic member to block the inlet channel;
• when a force exerted to the elastic member overcomes the supporting force, the sealing member is disengaged from the shoulder to allow gas in the gas pipe to flow through the check valve body;
• wherein the check valve body comprises a seat disposed in the inlet channel, an end of the elastic member urges against the sealing member, and another end of the elastic member urges against the seat;
• wherein the seat has a perforation, and the check valve body comprises a guided rod;
• an end of the guided rod is movably disposed in the perforation, and another end of the guided rod is connected to the sealing member;
• the elastic member is disposed around the guided rod;
• wherein the sealing member has a hole, the end of the guided rod connected to the sealing member has a head and a restricting portion;
• the guided rod passes through the hole, and the sealing member is located between the head and the restricting portion;
• a diameter of the head and a diameter of the restricting portion are greater than a diameter of the hole of the sealing member, and the diameter of the restricting portion is greater than a diameter of the perforation of the seat.