Product model: GB/DIN/HG/ANSI/IS

Product features: Easy to construct. If it is difficult to align the flange bolt holes during connection or to prevent changes in the flange bolt holes during future equipment replacement.

Advantages of flat welding ring loose flange:

1. Save costs. When the material of the pipe is special and expensive, the cost of welding flanges of the same material is high.

2. Not convenient for welding or processing, or requiring high strength. Such as plastic pipes, fiberglass pipes, etc.

3. Easy to construct. If it is difficult to align the flange bolt holes during connection or to prevent changes in the flange bolt holes during future equipment replacement.

Production standard for flat welding ring loose flange:

National standard: GB/T9112-2000 (GB9113 · 1-2000 ∼ GB9123? 4-2000)

German Standard: DIN2573、2572、2631、2576、2632、2633、2543、2634、2545（PL、SO、WN、BL、TH）

Ministry of Chemical Industry standards: HG5010-52 to HG5028-58, HGJ44-91 to HGJ65-91

Flange standard: HG20592-2009 (PN series) HG20615-2009 (Calss series)

American standard: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW)

Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW)

Characteristics of flat welding ring loose flange:

Not only does it save space and reduce weight, but more importantly, it ensures that the joint does not leak and has good sealing performance. The reason for the reduction in compact flange size is due to the decrease in the diameter of the seal, which will reduce the cross-section of the sealing surface. Secondly, the flange gasket has been replaced by a sealing ring to ensure that the sealing surface matches the sealing surface. In this way, only a small amount of pressure is required to tighten the sealing surface. As the required pressure decreases, the size and quantity of bolts can be correspondingly reduced, so a new product with small volume and light weight (70% to 80% lighter than traditional flanges) has been designed. Therefore, the flat welding flange type is a relatively high-quality flange product that reduces weight and space, playing an important role in industrial use.