J41H, J41Y, J41W GB standard globe valve produced by Lianggong Valve Group Co., Ltd. Its opening and closing part is a cylindrical valve flap, the sealing surface is flat or conical, and the valve flap moves linearly along the center line of the fluid. The national standard cut-off valve is only suitable for full opening and full closing. It is generally not used to adjust the flow rate. It can be adjusted and throttled when customized.