Lug Wafer Double Disc Check Valve

Lug Wafer Double Disc Check Valve – Overview

The lug wafer double disc check valve is a compact, lightweight backflow prevention device designed for installation between flanges in pipelines. Featuring a dual-disc, spring-loaded design, it ensures quick closure and minimal water hammer while maintaining a low-pressure drop. The lug-style body allows for easy alignment during installation and can be mounted in both horizontal and vertical orientations.

Key Design Features

• Dual Disc Configuration
  Two independent half-discs mounted on a central hinge pin for rapid closure, reducing reverse flow impact.

• Spring-Assisted Closure
  Ensures fast shutoff, minimizing water hammer and providing reliable sealing even in low-flow conditions.

• Lug Wafer Body
  Equipped with threaded lugs for precise flange alignment and the option for end-of-line service in certain configurations.

• Body & Disc Materials

  • Body: Cast iron, ductile iron, carbon steel, stainless steel

  • Discs: Stainless steel, duplex steel, or other alloys for corrosion resistance

  • Seat: NBR, EPDM, Viton, or metal-to-metal sealing depending on service needs

• Standards Compliance
  Designed per API 594, ASME B16.1/B16.5 flange standards, and tested according to API 598 requirements.

Applications

• Water Treatment & Distribution – Prevents backflow in clean water, wastewater, and desalination systems.

• HVAC Systems – Maintains directional flow in chilled water and condenser loops.

• Marine & Shipbuilding – Suitable for seawater systems with corrosion-resistant materials.

• Oil & Gas Pipelines – Handles non-corrosive and mildly corrosive process fluids.

Advantages

• Space-Saving Design – Thin wafer profile reduces pipeline footprint.

• Lightweight Construction – Easier handling and installation compared to full-body check valves.

• Versatile Orientation – Can be installed in both vertical and horizontal piping.

• Low Maintenance – Fewer moving parts ensure longer service intervals.