Flat Flange

As a professional China manufacturer and supplier, longan specializes in producing high-quality Flat Flange with stable performance and strict quality control. Our factory is equipped with advanced production lines and an experienced technical team, ensuring every product meets international standards and buyer requirements. We also offer OEM & ODM customization, competitive factory pricing, and free samples for evaluation. Contact us today to get a fast quotation and professional support from a reliable China factory.

Technical features

1. Improved dynamic sealing performance

Under the helium test standard, the leakage rate can reach ≤10⁻⁶ mbar·L/s, which is 10⁻⁴ higher than the industry average

Cycle life: 15MPa→0MPa alternation, Flat Flange passed 10,000 pressure fluctuation tests

Core technology: Laser etching double spiral sealing pattern, increasing the contact pressure of the sealing surface to 28MPa, 10MPa more than the traditional flat flange.

2. Weight is reduced by 45% and space occupancy is reduced by 60%.

Thickness: Traditional flange: 20-30mm, while our product is 12±0.2mm, nearly doubled

Weight: 304 stainless steel material is only 1.8kg/piece, while the national standard flange of the same caliber weighs 3.3kg.

Compact equipment compartment can save installation space 0.35m³/100 pieces of Flat Flange, reducing costs.

3. Doubled corrosion resistance

Salt spray test: ASTM B117 standard 2,000 hours without rust

Coating technology: Acid and alkali resistant pH range 1-13, 5μm nano Al₂O₃ composite coating

Applicable media: LNG (-162°C), covering extreme fluids such as liquid chlorine (99.8%) and concentrated sulfuric acid (98%).

Installation efficiency

Link Traditional flange Flat Flange Efficiency improvement

Bolt pre-tightening torque 85Nm (four corners alternately) 55Nm (single time standard) 35% labor saving

Single group hole alignment time 45±5 minutes 12±2 minutes 73%

Repair and disassembly time 30 minutes/piece 8 minutes/piece 79%

Solve the sealing failure caused by thermal cycle

Pre-tightening force self-compensation structure: Under 200-550°C working conditions, the sealing specific pressure only decays ≤8% (traditional flange decays 15-30%)

Thermal expansion coefficient matching design: Flat Flange body and bolts are made of the same series of stainless steel (316L) to avoid stress leakage when the temperature difference is greater than 100°C