Design Features of the DUR O LOK Couplings

• Compact – length and outside diameter reduced by 30% – 50%, compared to flanges. Allows double the number of pipes per rack. Provides improved external flow distribution for immersed couplings. Reduces shadowing for couplings used in process vessels
• Light weight – weight reduced by 60% -90%, compared to flanges
• Simple – Number of Parts reduced by 55% – 75% per connection,
  compared to flanges.
• Fast – Save up to 10-15 minutes to make or break each connection
• Non-restrictive – Full port inside diameter eliminates pressure
  drop and allows “pigging”.
• Smooth interior bore – Minimizes flow disturbance. Eliminates
  attrition in catalyst and other solids conveying applications.
• Boltless and threadless – No wrenches required. No torque
  measurements required. No bolt holes to align. No need to tighten
  connections after thermal cycling. Simplifies painting and insulation.
• Self-energized seal – Sealing force increases with pressure.
  Less chance of leaks.
• Thermally stable – Desgn minimizes thermal expansion effects on
  sealing- Tolerates very rapid changes or external or internal
  temperatures.
• No interferences fits or metal-to-metal sealing – Higher reliability.
  Less susceptible to damage.