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C518 DUAL FLAP CHECK VALVE

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OVERVIEW

Dual Flap Check Valves operate with minimum flow restriction. These valves are typically installed on the discharge side of the pump, equipment, and piping system. When there is flow in the pipeline, a spring-loaded half-disc opens to shut down against any backflow. VAHN-TECH silent check valves are used in the following applications: General Water Supply, Fire Fighting, HVAC, District Cooling & Sewage System.

TECHNICAL SPECIFICATIONS

DESIGN STANDARD AWWA C518 / API 6D
SIZE RANGE 2" - 24"
PRESSURE RATING Class 125 - 250
WORKING TEMPERATURE -10˚C ~ +120˚C
END CONNECTION Wafer Type Lug Type (Optional)
FACE to FACE AWWA C518 / API 6D
TEST & INSPECTION AWWA C518 / API 6D
MATERIALS
Body Ductile Iron / Al-Bronze / Stainless Steel
Disc Stainless Steel / Al-Bronze
Seat Rubber (NBR / EPDM)

DESIGN DETAILS

      • The short face-to-face dimension and compact design of the VAHN-TECH Dual Flap Check Valve allow easy installation and service in tight spaces.
      • Spring-assisted quick closure allows for better dynamic behaviour and prevents water hammer.
      • The resilient seating and springs provide perfect tightness, even at low differential pressure.
      • High-strength ductile iron body reduces the weight and improves the valve’s long-term durability.
      • All iron parts are coated inside & outside with fusion-bonded epoxy for corrosion resistance per AWWA C550.
      • Valves can be installed in the horizontal or vertical position.
      • ANSI Class 125 and ANSI Class 150 dimensions.
      • NSF61 certified valve.