Check Valves Spring Series With 20 Diameter (09011) are versatile devices used for controlling the flow of liquids or gases. They play an important role in countless piping and process systems, typically serving to regulate flow and pressure, start or stop flow, or prevent the occurrence of back flow within a system. A swing check valve uses a flapper that 'swings' off the seat to allow forward flow and then swings back onto the seat when the flow is stopped. In contrast, a spring loaded check valve incorporates a spring to assist in closing the valve. The metal springs in spring loaded check valves are made of stainless steel or some other highly corrosion resistant steel alloy.

• Abrasions resistant