Cv Explained: Sizing a Control Valve Without Guessing
What the flow coefficient actually means, where the ISA-75 formulas come from, and the four mistakes that lead to oversized valves and noisy plants.
Read ArticlePractical articles on sizing, material selection, and control strategy. Written by engineers who'd rather solve problems than sell parts.
What the flow coefficient actually means, where the ISA-75 formulas come from, and the four mistakes that lead to oversized valves and noisy plants.
Read ArticleWhen does H₂S exposure trigger NACE? Which alloys actually qualify, which ones look fine on paper but fail in the field, and how to spec without getting burned.
Read ArticleGlobe, ball, butterfly, or gate? A practical decision framework based on what the process actually needs — modulation, isolation, or both.
Read ArticleTwo common control-valve complaints look identical and need different fixes. How to diagnose which one is eating your trim — and the right solution for each.
Read ArticleWhat the tightness classes actually mean, what it takes to qualify, and how to write the spec without over- or under-paying for stem-seal performance.
Read ArticleWhat the extended bonnet actually does, how to size it for your temperature, and what else has to be right — body, trim, qualification — for cryo to work.
Read ArticleTorque is the easy part. Air availability, fail-safe behavior, duty cycle, and hazardous-area rating drive the real decision — and the hidden cost factors that get missed.
Read ArticleWhy ball, butterfly, and globe valves fail in tailings and pulp stock — and how to spec a knife gate (seat, gate, body, actuator) that actually lasts.
Read ArticleWhen fluoropolymer linings beat solid alloys for sulfuric, HCl, and bleach — and the spec details (thickness, venting, spark test) that separate ten-year linings from ten-month ones.
Read Article"Bubble-tight" and "tight shutoff" aren't the same thing. What each class actually allows, how it's tested, and which one to spec for your service.
Read ArticleHow to tell whether cavitation, energy dissipation, or erosion is killing your trim — and how to pick anti-cavitation cages, multi-stage drops, or harder materials accordingly.
Read ArticleWhat the standards actually certify, what they don't cover (actuators, tubing, ESD logic), and how to spec a fire-safe assembly that works for your hazard scenario.
Read ArticleHow each characteristic behaves in real piping, how the installed pressure-drop ratio decides which one fits, and the spec mistakes that cause control instability.
Read ArticleSend us your operating conditions and our engineers will run the numbers — Cv, materials, vendor recommendation. No pressure, no automated funnel.
In loving memory of our founders and friends, Wayne and Lawton Miller