Equal Percentage vs Linear Control Valve: Inherent vs Installed Characteristics
Learn how equal-percentage and linear control valve characteristics change after installation, how rangeability differs from process turndown, and how to select the correct trim from system pressure drop and predicted travel.
How to Size a Control Valve: Cv, Kv, Flow Cases and Valve Travel
Learn how to size a control valve using minimum, normal and maximum flow conditions, Cv or Kv, pressure drop, predicted valve travel and severe-service checks.
Control Valve Selection Guide: Body Style, Trim, Actuator and Severe Service
A practical control valve selection guide covering body styles, pressure-temperature ratings, trim construction, severe-service risks, leakage classes, actuators, accessories and project inspection requirements.
Valve Actuator Selection Guide: Pneumatic, Electric and Hydraulic Systems
This practical valve actuator selection guide explains how to select pneumatic, electric or hydraulic actuation by valve motion, operating torque or thrust, available utilities, fail action, control mode, duty, environment, mounting interface and package testing requirements.
Pneumatic Actuator Air Consumption: How to Size Air Supply for Actuated Valves
Calculate pneumatic actuator air consumption from chamber volume, absolute supply pressure and cycle frequency, then size the solenoid, regulator and tubing for the much higher flow required during valve travel. Includes a worked example, air-receiver screening method and commissioning checks.
Valve Stem Thrust Calculation: How to Size Actuators for Gate and Globe Valves
Learn how to calculate valve stem thrust for rising-stem gate and globe valves, separate opening and closing load cases, convert thrust to stem-nut torque, check safety margin and prepare actuator sizing data.