Control Valves

Select a valve based on fluid type, pressure and temperature ranges, required flow capacity (Cv), actuation method (manual, electric, pneumatic), and materials compatibility; match valve size to pipe diameter and consider control accuracy and response time for the process

Common types include globe valves for throttling, ball and butterfly valves for on/off with some control ability, and diaphragm or needle valves for fine flow adjustments; actuated variants provide automated control

Determine required flow rate and differential pressure, then use the valve flow coefficient (Cv) and manufacturer sizing charts or equations to select a valve with an appropriate Cv and trim that avoids excessive noise, cavitation, or poor control

Choose body and internal materials (stainless steel, carbon steel, brass, PVC) based on corrosion, abrasion, and temperature conditions; select appropriate seat and stem materials and seals (PTFE, rubber, metal) for chemical compatibility and wear resistance

Prices vary by type, size, materials, and actuation; simple manual valves can be in the lower price ranges while larger, high-alloy, or actuated control valves typically cost more, with typical product category averages reflecting mid-range industrial prices

Install valves with correct alignment and supports, use recommended actuators and positioners, remove debris before commissioning, perform periodic inspection of seals and packing, verify calibration of positioners, and follow a scheduled lubrication and tightening routine

Perform leak and pressure tests, cycle the valve through its range to check smooth operation, use a calibrated positioner or flow meter to map input signal to flow or valve position, and adjust deadband, gain, or stroking limits per manufacturer guidelines