| 摘要 |
The flange used for connecting main gas supply pipe with a nozzle prevents the leakage of gas and improves the structural strength of the connecting part. The flange has the projecting connecting part on its body (53), boss part (54) for combining the center of the body (53) with the connecting part. The connecting part (5) comprises a reinforcing structure (8) for connecting with the circular part of a gas supply pipe (1), which has an elliptical section in order to be contacted with radial contacting area wider than lengthwise direction contacting area.
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