zero liquid discharge
Valve materials, flushing design, and differential pressure management for zero liquid discharge service — concentrated brine, scaling, chloride attack, and lined valve applications.
knife gate valves
Valve selection for wastewater treatment plants — sludge and scum lines, grit service, knife gate and pinch valve advantages, H2S corrosion, biogas area safety, and maintenance practice.
drinking water compliance
Drinking water approval systems for valves compared — WRAS, KTW/DVGW, NSF/ANSI 61, and ACS — covering migration testing, metal leaching limits, lubricants, and procurement compliance.
API 600
A practical comparison of API 600, API 602 and API 603 gate valve standards — scope, wall thickness, trim numbering, end connections, testing and how to pick the right one for procurement.
API 608
API 608 and API 6D both cover ball valves, but they serve different duties. Compare scope, DBB and DIB functions, cavity relief, testing and end-to-end dimensions to choose correctly.
leakage rate
How ISO 5208 and API 598 differ in scope, leakage grades, test media, test pressure and directionality — and how to reference them correctly in a valve purchase specification.
API 607
What fire-safe valve certification really means. Compare API 607 and API 6FA test conditions, burn temperature, cooling water pressure, leakage acceptance and certification scope.
API 609
Why ASME B16.10 face-to-face dimensions matter for valve interchangeability, spares and plant modifications — including API 6D lengths, API 609 and ISO 5752 butterfly valve series.
valve testing
A practical guide to ANSI/FCI 70-2 seat leakage classes for control valves — test conditions, Class IV defaults, Class VI soft seats, and how to specify the right class without overpaying.
extended bonnet
How BS 6364 cryogenic valve testing works — liquid nitrogen immersion, temperature stabilization, low-temperature seat tests, extended bonnet design, and what to verify before you buy.
IECEx
A practical guide to ATEX and IECEx certification for valve actuators — zones, Ex protection types, temperature classes, documentation, and the specification mistakes that cause compliance failures.
notified body
How the Pressure Equipment Directive applies to valves — fluid groups, category assessment, SEP, material approvals, welding qualifications, final assessment, and the documents a European project will ask for.