The J41Y flange forged steel globe valve manufactured by Shanghai Shuangheng Valve Co., Ltd. is a commonly used high-temperature and high-pressure shut-off valve, mainly used to connect or cut off the medium in pipelines, and is generally not used to regulate flow. J41Y forged steel globe valve is suitable for a wide range of pressure and temperature. This valve is suitable for small-diameter pipelines, with a sealing surface that is not easily worn or scratched, good sealing performance, small valve disc stroke during opening and closing, short opening and closing time, and small valve height. There are three types of valve cover designs for forged steel globe valves. The first type is bolt type valve cover, which is designed in this way. The valve body and valve cover are connected by bolts and nuts, and sealed with wrapped gaskets (made of 316 clip flexible graphite). When customers have special requirements, metal rings can also be used for connection. The second design form is a welded valve cover. According to this design form, the valve body and valve cover are connected by threads and fully welded sealed. When customers have special requirements, full soldering connections can also be used. The third type is the pressure self tightening valve cover. Valves designed in this form have a threaded connection between the valve body and cover, and are sealed with an internal pressure self sealing ring.