The protective cap on the safety valve cannot be removed. The protective cap on the safety valve protects the constant pressure nut from external interference and cannot be removed during normal use. When disassembly and maintenance are needed, the first step is to take off the protective cap, uncover the trademark on the valve cover, and you can see the screws inside. Loosen this screw and you can take it off. If there is no trademark on it, there is a small hole on the side. Loosen the screw in this small hole and the valve cover can be taken off.