What is the purpose of the V-notch on a fuel gas regulator?

The purpose of the V-notch on a fuel gas regulator is to indicate that the threads are left-handed. This is an important safety feature, as left-handed threads are used in certain applications to prevent accidental disconnection or assembly with right-handed threaded components. Recognizing the orientation of the threads helps ensure that the regulator is installed correctly, thus preventing leaks or other issues that may arise from improper assembly. Knowing thread types, including the left-handed designation signified by the V-notch, is crucial for maintaining safe and effective operation within oxyfuel cutting systems.