Issuing body
API
Latest edition
7th Edition (2017)
Region
USA, Global
Equipment items
1
Scope
Standard orifice sizes (D through T) and dimensional/pressure ratings for flanged steel PRVs.
Key requirements (6)
- Flanged steel pressure relief valves — sets dimensions, materials, pressure-temp ratings.
- Orifice designators: D, E, F, G, H, J, K, L, M, N, P, Q, R, T (D = 0.110 in², T = 26 in²).
- Pressure classes: 150, 300, 600, 900, 1500, 2500.
- Body materials: CS, alloy steel, stainless options.
- Spring chamber materials matched to bonnet temperature.
- Companion to API 520 (sizing) and API 527 (seat tightness).
Related standards (2)
Applied to 1 equipment item
Safety & Relief