This series of valves are a kind of devices necessary for medium conveying pipe systems, which are used to filter mechanical impurities in medium to protect the parts of equipment and pipelines from wear and blocking. All inner parts are made of stainless steel, and sturdy and durable. With small volume, fine filtration pore, small resistance, high efficiency, easy installation and maintenance, and low cost, the filter can meet the needs of various pipelines. The valve is widely applied.