NASA-SPEC-5022 w/Change 2, Revalidation with Editorial/Administrative Changes 2021-07-16. Active. Scope: This NASA Technical Specification establishes and implements the manufacturing and test requirements and applications guidelines for normally closed (NC) parent metal shear-section valves. The NASA Technical Specification is a guide for design engineers to develop more detailed requirements for specific pyrovalve applications. Adherence to these requirements will reliably prevent NC parent metal valve leakage or other failure-induced release of hazardous fluids (liquids or gases) from NASA payloads on Expendable Launch Vehicles (ELVs). This NASA Technical Specification does not address NC parent metal valve sizing, pressure drop, and other requirements. Publicly Accessible. NASA Endorsed. OCE.