Sealing letter replacement: When the temperature is below -5 ° C, a dedicated low-temperature sealing letter (DN15... 50:428488060; DN65... 150:467956290) needs to be replaced;
Replacement parts: VXF53. Replace VXF41. Series requires specialized matching parts (such as ALF41B15, compatible with DN15).
Compliance and Standards
Pressure Vessel Directive: Compliant with PED 2014/68/EU, DN65... 125 is classified as Class I (Module A), DN150... 250 is classified as Class II (Module A2);
Basic standards: comply with ISO 7005 (flange), EN 1092 (flange connection), VDI 2173 (valve characteristics), EN 60534-4 (leakage rate);
CE marking: DN65... 150 notified body number 0036, DN200... 250 notified body number 0035, compliance documents can be downloaded from Siemens official website.

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