Universal check valve type 2281 intended for industrial installations, can be used for air, gases, water, chemicals, petrochemical products, etc., considering the chemical resistance of the valve material. The valve can be installed in any position, according to the flow direction indicated on the body. Maximum constant working pressure across the full temperature range. Body material: brass. Spring material: AISI 302 steel. Disc: brass. Disc sealing: FKM. Connection: BSP thread. Operating temperature: from -10°C to +90°C. Minimum opening pressure: 0.02 bar for 3/8″ to 2.1/2″; 0.1 bar for 3″ to 4″.