Welco strainer is one of the indispensable devices on medium transportation pipeline. It"s usually installed on the input end of pressure reducing valve, pressure release valve, level control valve or other equipment. It"s used to Strainer impurities in medium. It can Strainer rust, sand in sewage, small amount of solid particles in liquid and other impurities to protect normal operation of valve and equipment. Working principal: when fluid enters Strainer cartridge equipped with Strainer screen, the impurities are blocked, and clean filtrate is drained through Strainer outlet. For cleaning, just need to take the removable cartridge out and install it again after treatment.