Valve Flow Calculation: Q = Cv x sqrt(dP/SG) Explained with Examples
The Short Answer Flow through a valve follows a simple square-root law for liquids: flow is proportional to the valve’s […]
Drawings & Calculations
Actuators
Linear vs Rotary Actuator: Matching Motion to the Valve Type
The Short Answer Linear actuators move a valve stem straight up and down; rotary actuators turn a shaft through an […]
Troubleshooting & Maintenance
Butterfly Valve Disc Damage: Troubleshooting Cavitation, Erosion and Overload
The Short Answer A butterfly valve disc that is scratched, pitted, deformed or even cracked is usually the symptom of […]
Materials & Corrosion
Nitrile vs Viton Valve O-Rings: Chemistry, Temperature and Cost
The Short Answer Nitrile (NBR) and Viton (FKM) are the two elastomers most often compared for valve O-rings and soft […]
Valve Selection
Top Entry vs Split Body Ball Valve: Maintenance Access and Cost Compared
The Short Answer Top-entry and split-body ball valves are two ways of building access into the same valve — and […]
Glossary
Fugitive Emissions Valve Meaning: Stem Seals, Standards and Compliance
The Short Answer Fugitive emissions are unintentional leaks of gas or volatile liquid from pressurized equipment — and for valves, […]
Industry News
Electric Actuator Market Growth: Drivers, Limits and What Buyers Should Know
The Short Answer Electric valve actuators are the fastest-growing segment of the industrial valve actuation market, driven by plants replacing […]
Drawings & Calculations
Valve Cv Calculation: Formula, Worked Example and Sizing Steps
The Short Answer Cv, or flow coefficient, is a number that describes how much fluid a valve will pass at […]
Actuators
Rack and Pinion vs Scotch Yoke Actuator: Matching Torque to the Valve
The Short Answer Rack-and-pinion and scotch-yoke actuators are both pneumatic rotary actuators for quarter-turn valves, but they deliver torque differently. […]
Troubleshooting & Maintenance
Valve Noise: Causes, Diagnosis and Fixes for Cavitation, Flashing and Vibration
The Short Answer Valve noise is a signal, not just a nuisance. The most common causes are cavitation, flashing, choked […]
Materials & Corrosion
PTFE vs PEEK Valve Seats: Temperature, Friction and Service Fit
The Short Answer PTFE and PEEK are both high-performance polymers used for valve seats and seals, and the choice usually […]
Valve Selection
Globe Valve vs Needle Valve for Regulation: Matching Scale to the Duty
The Short Answer Globe valves and needle valves both regulate flow by moving a disc or plug toward a seat, […]
Glossary
Fire Safe Valve Meaning: What the Rating Really Covers
The Short Answer “Fire safe” describes a valve design that is tested and shown to limit leakage — seat and […]
Industry News
Valve Industry Automation Trends: Smart Positioners, Electric Actuation and Digitalization
The Short Answer The industrial valve market is moving decisively toward automation and digitalization. Smart positioners with diagnostics, predictive maintenance, […]
Drawings & Calculations
Valve Leakage Class Explained: Limits, Testing and How to Specify
The Short Answer Valve leakage class is a standardized way of expressing how much leakage a valve may pass when […]
Actuators
Air Lock vs Spring Return Actuator: Which Failure Mode Do You Need?
The Short Answer An air lock actuator and a spring return actuator are two ways of positioning a valve for […]
Troubleshooting & Maintenance
Control Valve Hunting: Causes, Diagnosis and Fixes
The Short Answer Control valve hunting is a rapid, continuous cycling of the valve and its positioner around a setpoint […]
Materials & Corrosion
EPDM vs Buna-N Valve Seats: Chemical Compatibility and Selection
The Short Answer EPDM and Buna-N (NBR) are both common elastomers for valve seats and seals, but they serve opposite […]
Valve Standards & Specifications
ASME B16.5 vs B16.47 Flanges: Sizes, Series and How to Choose
The Short Answer ASME B16.5 and ASME B16.47 are two different flange standards that cover different size ranges. B16.5 is […]
Valve Selection
Pinch Valve vs Gate Valve: Which Seals Better for Slurry and Abrasive Service?
The Short Answer Pinch valves and gate valves both act as on/off isolation devices, but they seal with completely different […]
Glossary
Valve Trim Materials Explained: Seats, Discs, Stems and How to Choose Them
The Short Answer “Trim” is the collective name for the internal parts of a valve that come into contact with […]
Industry News
Valve Industry Supply Chain Outlook: What Buyers Should Expect
The Short Answer The industrial valve supply chain is coming out of an unusually volatile period, with long lead times […]
Drawings & Calculations
Hydrostatic Test Pressure Calculation: How It Works and How to Do It
The Short Answer Hydrostatic test pressure is calculated from the component’s design pressure or pressure rating, multiplied by a code-specific […]
Actuators
Limit Switch vs Valve Positioner: Two Accessories, Two Different Jobs
The Short Answer Limit switches and valve positioners are both mounted on actuated valves, but they do different jobs. A […]
Troubleshooting & Maintenance
Valve Packing Leak Repair: How to Diagnose, Tighten and Repack a Leaking Stem
The Short Answer A valve packing leak is a leak around the valve stem where it passes through the bonnet, […]