Valves are a fundamental part of most hydraulic systems. When properly selected, they can provide many years of trouble-free operation controlling flow or pressure, controlling transients, handling trapped air problems, preventing backflow, avoiding cavitation, noise and vibrations and many other tasks. However, all too often, valves create operational problems.



TEC has extensive research, laboratory testing, field testing and consulting experience with most types of valves and gates and have investigated many different valve and gate problems. We also provide forensic engineering services and trial assistance for law firms on problems related to valves.

Challenging Valve Problems

  • Valve cavitation problems at the Swan Island Pump Station, Carollo Engineers, Seattle WA., 2002
  • Evaluating orifice cavitation, Westinghouse Corp., 2001
  • Evaluation of butterfly valve cavitation at Comanchee Nuclear Power Plant, Altran Corp., 2000
  • Cavitation Damage to Sleeve Valve, Bogota Colombia, 2003
  • Cavitation Damage to Ball Valves, Saudi Arabia, 2000
  • Flood Valves for the Shuttle Launch Pad, failure to open
  • Determination of safe operating limits for Bullards Dam lower outlet valves
  • Selection of Control Valves for or Cavitation and Noise Control
  • Cavitation Analysis for Numerous Valve Installations
  • Analysis of Numerous Control Valve Failures
  • Transients Caused by Valve Closure
  • Analysis of Turbine Bypass Valves
  • Torque and Thrust Testing
  • Flow Calibrations/Valve Stability Tests
  • Closure Speed of Check Valves
  • Use of Valves for Pressure Regulation
  • Noise generated by Flow and Cavitation
  • Cavitation Damage Testing
  • Sealing Tests
  • Cycle Testing

Control Valves

  • Ball Valves
  • Butterfly Valves
  • Cavitation Control Valves
  • Channel Stream Valves
  • Cone Valves
  • Roto Disc Valves
  • Double Disc Gate Valves
  • Gate Valves
  • Rubber Seated Gate Valves
  • Globe Valves
  • Larner Johnson Needle Valves
  • Plug Valves
  • Sleeve Valves
  • Spherical Valves
  • Tiger tooth Valves
  • Wafer Sphere Valves

Check Valves

  • Lift Check Valves
  • Double Door Check Valves
  • Lift Check Valves
  • Nozzle valves
  • Stop-Check Valves
  • Silent Check Valves
  • SwingValves
  • Tilt disc Check Valves

Free Discharge Valves

  • Ball Valves
  • Butterfly Valves
  • Fixed Cone (Howell Bunger) Valves
  • Hollow Jet Vavles
  • Hollow Cone Valves
  • Larner Johnson Needle Valves
  • Sleeve Valves

Misc. Valves and Gates

  • Air Release and Air Vacuum Valves
  • Altitude Valves
  • Ballast Valves
  • Fire Hydrants
  • Injector nozzles for diesel engines
  • Pinch Valves
  • Slurry Valves
  • Surge Anticipating Valves
  • Surge Arrestor Valves
  • Pressure Relief Valves
  • Thermostatic Mixing Valves
  • Fixed Wheel Gates
  • Slide Gates
  • Stop Log Gates
  • Radial Gates
  • Crest Gates