This document provides information on the construction and materials of the safety valves Type 441 and 442 DIN according to the LWN 462.01-D and LWN 462.02-D standards.
The LESER 441/442 DIN series are flanged spring safety valves offered in conventional and stainless‑steel bellows constructions. The document lists the various component parts, material options and part numbers for each variant.
Key data include DN size ranges, pressure and temperature limits, material grades for caps, screws and seals, as well as ordering codes for different configurations. Dimensional tables and weight figures are provided for each size. This manual is written in German.