The Dual Disc® Check Valve is designed to prevent reverse flow automatically. On pump start-up, the flow of water enters the valve from the seat end and forces the two discs open until they strike the disc stop pin. On pump shutdown, the torsion spring closes the disc before a flow reversal takes place. The valve body is supplied with either compact wafer ends for installation between mating flanges or in a lug wafer configuration where the flanges are tapped to accept flange bolts. The only moving parts in the valve are the discs and spring. The discs and spring are guided in the body with a hinge pin and a full open disc stop pin. The pins are restrained in the body by stabilization spheres to prevent vibration. The valve also has a resilient seat for drop tight shut off.