Type 561 and Type 562 cone check valves

The Type 561 and Type 562 cone check valves have an aerodynamic, spherical-shaped cone that ensures tight closing and leakproof operation. The cone’s double bearing prevents it from tilting, even during rapid closing, and eliminates malfunctions. Other design features include a cone guide that prevents jamming; a fixed gasket that eliminates slipping, bending, or gasket erosion; and a union that allows for easy replacement or maintenance in the field. The Type 562 valve has an integrated stainless steel spring (other material options are available) for horizontal installation, while the Type 561 valve has no spring and is mounted vertically. The valves have an operating pressure rating of 2.9 psi and are available in sizes from 3/8 in. to 4 in. Materials of construction include polyvinylchloride (PVC), chlorinated PVC (CPVC), polypropylene, polyvinylidene fluoride (PVDF), and acrylonitrile butadiene styrene (ABS); sealing materials include ethylene propylene diene monomer (EPDM) rubber and fluoroelastomer (FPM).