Pressure reducing valve

The invention relates to a pressure reducing valve. The pressure reducing valve comprises a valve body, a valve element, an upper bonnet, a cover plate, a regulating bolt, a regulating post, a regulating spring, a sealing cover and a sealing body, wherein the inner part of the valve body is provided with an upper valve chamber and a lower valve chamber; a control hole is formed between the upper valve chamber and the lower valve chamber; the two sides of the valve body are provided with a water inlet and a water outlet; the water inlet communicates with the upper valve chamber; the water outlet communicates with the lower valve chamber; the sealing cover and the sealing body are positioned on the upper end part of the valve body; the regulating spring is positioned in the upper bonnet; the sealing body is arranged in the upper valve chamber; the valve element comprises a guide post and a tapered plug; a water outlet pipeline is gradually thickened in a tapered manner, and a blocking ball and a filter element are sequentially arranged in the pipeline; the blocking ball is fixedly arranged in the pipeline through a spring; a sewage discharge pipeline is arranged on the pipeline between the blocking ball and the filter element; and a stop valve is arranged on the sewage discharge pipeline. The pressure reducing valve has a pressure reducing function, and can filter a flow-through fluid and can prevent the fluid from flowing back.