630.941.7600 | [email protected] | valmatic.com 95 4/24 Specifiable Features With today’s demanding system requirements, engineers must specify piping components that are both cost efficient and reliable. The design of the Val- Matic Dual Disc® Check Valve answers those needs by incorporating many unique characteristics not found in similar check valves. 2” - 12” (50-300mm) valves include ductile iron construction, with a 250 psi (17.2 BAR), cold working pressure rating. They are UL listed, FM approved and available in Wafer (ANSI 125, ISO PN10, ISO PN16) and Grooved End IPS connections. Sizes 14” (350mm) and larger are available in cast and ductile iron. Installation Cost Choose between compact wafer design to minimize space requirements or grooved end for ease of installation. Both provide low initial installation cost and minimal maintenance for horizontal or vertical flow up installations. The following quality features you expect from Val-Matic can be found in both the wafer and grooved end valves. Operating Cost Careful attention to inlet contouring and streamlined flow design, combined with an optimal flow area, results in low pressure loss characteristics. The resulting low power consumption translates into dollar savings throughout the long life of the valve. Product Reliability Design features such as Lift and Pivot Disc Action, Stabilization Spheres, Pressure Sensitive Seating, Disc Stabilization, Disc Seal Overlap and Flow Sensitive Closure, combined with careful selection of materials of construction, reflect Val-Matic’s efforts to build a quality valve. These efforts result in a Cost Efficient and Reliable product that will provide many years of trouble free service. Lift and Pivot Disc Action This feature, designed to provide longer valve life, is activated during the opening and closing cycles. It works by a combination of clearance between the pivot pin and disc bores, and the placement of the legs of the torsion spring. With this design the disc will always lift first at the pivot on opening, and not return until the disc is closed, preventing wear between disc and seat surfaces. Stabilization Spheres The resilient, synthetic spheres inserted into the hinge and stop pin holes are compressed against the pins and effectively stabilize them during flow conditions, eliminating vibration and wear. Pressure Sensitive Seating This design provides for minimum disc-to-seat contact at low pressures, and maximum contact at high pressures resulting in positive seating under all conditions. Disc Stabilization When the valve is fully open, the discs are positioned on a slight angle, causing the flow velocity to force the discs firmly against the stop pin. The ensuing vector forces act to stabilize the disc during flow conditions thereby preventing excessive wear due to disc “flutter.” Disc Seal Overlap Contact between the seal and the disc is uniquely designed to eliminate indentation ridges found in designs which do not allow the disc to fully overlap the seal. Indentation ridges caused by valve designs with discs smaller in diameter than the seal can result in valve leakage. Flow Sensitive Closure The torsion spring closes the valve when the flow is reduced, preventing flow reversal and lessening the potential for water hammer normally associated with conventional swing check valves. Sphere Low Pressure minimum contact High Pressure full contact Overlap Design Non-Overlap Design Dual Disc® Check Valves Dual Disc® Check Valves
