This standard is a consolidation and revision of the following five individual standards: B40.1, Pressure Indicating Dial Type – Elastic Element Gauges, B40.2, Diaphragm Seals, B40.5, Snubbers, B40.6, Pressure Limiter Valves and B40.7, Pressure Digital Indicating Gauges. These individual standards provide terminology and definitions, dimensions, safety, construction and installation issues, test procedures and general recommendations.