The presence of foreign particles entering a control valve or other high precision controlling or monitoring device can seriously affect its accuracy and dependability. In extreme cases the internal parts can be completely destroyed.
Strainers are installed close to the inlet side of precision equipment to prevent pipe chips, scale, rust, welding slag and other harmful material from entering the equipment.
Strainers are built of various materials such as cast iron, carbon steel, aluminum bronze, stainless steel and other materials to withstand corrosive chemicals and salt water. They are built in various configurations such as Y, T, Basket, and duplex to accommodate pipe and process needs. The above image is a Mueller model 792BH, an example of a duplex strainer.