API 624 fugitive emissions testing evaluates stem-seal performance on rising-stem valves under mechanical and thermal cycling. This guide explains what buyers should verify in test reports, specifications, and supplier quotations.
API 624 Fugitive Emissions Testing for Rising-Stem Valves: What Buyers Need Keep Reading »
API 641 helps buyers evaluate fugitive emissions performance in quarter-turn valves. Learn how to check qualification evidence, match the tested design to your specification, and prepare a complete RFQ.
API 641 Fugitive Emissions Qualification for Quarter-Turn Valves Keep Reading »
MSS SP-25 valve marking helps buyers verify valve identity, material, rating, size, and traceability at receipt and during service. This checklist explains what to confirm in specifications, drawings, inspections, and RFQs.
MSS SP-25 Valve Marking and Identification: A Procurement Checklist Keep Reading »
ASME B16.5 and B16.47 apply to different nominal flange size ranges. This guide explains the size boundary, B16.47 Series A versus Series B, and the details buyers must confirm before ordering a large flanged valve.
ASME B16.5 vs B16.47 Flanges: Choosing the Right Standard for Large Valves Keep Reading »
API 526 orifice letters standardize safety valve flow areas and dimensional envelopes, but the correct designation must come from a complete relief calculation. This guide explains how engineers and buyers can verify sizing, materials, testing, documentation, and quote comparability.
API 526 Orifice Designations: How to Select the Correct PSV Keep Reading »
Learn how to specify an API 594 check valve by body style, plate design, pressure class, materials, dimensions, testing, and service conditions. Includes a practical comparison table and RFQ checklist.
API 594 Check Valve Standard: Wafer, Lug, and Double-Plate Requirements Keep Reading »
