Division 3.3.4 Provisions regarding the approval of hydrogen valves Original text. Later amendments are not shown. 3.3.4.1Division 3.3.4.1 3.3.4.2Design temperatures 3.3.4.3Applicable test procedures 3.3.4.4Division 3.3.4.4 ← Division 3.3.3 Division 3.3.4 Division 3.3.4.1 →