Fluorine lining safety valve capable of adjusting opening and closing pressure difference

The utility model relates to a fluorine-lined safety valve capable of adjusting opening and closing pressure difference, which comprises a valve body, a valve seat, a valve clack, a recoil disc, a guide sleeve, a valve cover and a pressure setting device, medium contact surfaces of the valve body and the valve seat are lined with fluorine plastics, and the recoil disc and the guide sleeve are made of polytetrafluoroethylene materials; the device is characterized in that an on-off pressure difference adjusting device is arranged on the excircle surface of the recoil disc, the on-off pressure difference adjusting device is formed by installing an adjusting ring on an external thread of the excircle surface of the recoil disc through an internal thread, the excircle surface of the upper part of the adjusting ring adopts a hexagon nut structure, and the lower part of the adjusting ring protrudes out of the lower plane of the recoil disc. The vertical position of the adjusting ring on the recoil disc can be adjust