Yz11X type direct acting membrane branch pressure reducing valve is a direct acting membrane spring pressure reducing valve, which is designed and manufactured on the basis of absorbing the advantages of similar foreign products. It is mainly composed of diaphragm, shaped valve disc, adjusting spring and other parts. The diaphragm is used to sense the downstream pressure change to drive the valve disc, change and control the valve opening to achieve the function of reducing pressure and stabilizing. The outlet pressure value is set by adjusting the spring pressure by the setting. Yz11X type direct acting membrane branch pipe pressure reducing valve appropriately increases the diaphragm area and improves sensitivity. Decompression and pressure regulation are stable and sensitive. It is suitable for the use of branch pipelines of high-rise buildings, apartment buildings and residential areas, as well as household branch pipes of apartments and residences.