Quick Close to Reduce Water Hammer
Shut-off is achieved via the fully automatic, spring-assisted discs that close near zero flow velocity. The lightweight, split disc design creates a positive shutoff prior to flow reversal and helps minimize valve slam and surge.

Ductile Iron, Carbon Steel or 316 Stainless Steel Construction
The ductile iron body maintains the anti-corrosive properties of cast iron while achieving yield strength comparable to carbon steel. Ductile iron also offers higher pressure/temperature ratings than cast iron. The CDD Double Door Check Valve is also available in Carbon Steel and Stainless Steel for corrosion resistance or higher pressure services.

Resilient or Metal Seats
Resilient seats in Terpolymer of Ethylene Propylene & A Diene (EPDM), Acrylonitrile-Butadiene (NBR) or Fluoro Rubber (FKM) ensure a bubble tight seal that meets or exceeds API 598 test requirements. Lapped metal seats meet or exceed API 598 test requirements.

Cost Efficient Design
The low weight and short laying length of the CDD Double Door Check Valve saves initial cost, requires less space, and is easier to install when compared to full-body, swing-type check valves. Although this valve is light in weight, it is capable of heavy duty, continuous operation. APCO carbon steel and stainless steel CDD Double Door Check Valves meet ASME B16.10/API 594 face-to-face dimensions and ASME B16.5 Flange Dimensions.

Minimal Head Loss
The contoured body of the CDD Double Door Check Valve provides a short and straight flow path that generates very little turbulence. Additionally, the spring-loaded discs are designed with very low cracking pressure which reduces the amount of energy required to open the valve.