Which flange standards does the LGF-PA66 support? Matching GB, ANSI and DIN flanges on old pipelines

The LGF-PA66 is built by default to GB/T 9119 and HG/T 20592 flange standards in PN10/PN16/PN25; export orders are produced to ANSI B16.5 (Class 150/300) or DIN EN 1092-1 on request. When retrofitting an old line, DN size alone is not enough — verify four parameters before ordering:

• Flange outside diameter and sealing-face type (raised face RF or flat face FF);
• Bolt-circle diameter, number and diameter of holes — GB and ANSI hole patterns differ at the same DN and will not line up if mixed;
• Pressure rating at or above the maximum working pressure of the line;
• Gasket type and thickness compatible with the existing pipeline gaskets.

The PA66 flange is moulded as one piece with the body, so tighten it with a torque wrench in a diagonal, cross-pattern sequence and stay within the manual's torque values — flange crushing from over-torque is the most common installation damage on composite meters. Special legacy standards (old GOST or JIS flanges, for example) can be machined to customer drawings; custom flange lead time is about two weeks. After installation, commission communication with an EC32 RTU and verify the readings against actual line flow before sign-off.

For more information, please visit our product pages or contact our technical team.