XRCISER® Partial Stroke Testing Device

Partial Stroke Testing Device - Emergency Shutdown Valves

Begin with any QTRCO actuator, add tandem pistons to serve as pneumatically engaged travel stops, and controls as appropriate for your application.

The standard QTRCO actuator uses a travel stop screw in the end cap to limit outward travel of the actuator piston, and therefore valve travel. In the XRCISER® configuration the pneumatically engaged tandem pistons become the outward travel stop. By confirming tandem piston pressure and position; spurious valve travel is prevented during the partial stroke cycle.

XRCISER Partial Stroke Test Step 1

XRCISER Partial Stroke Testing Step 2

XRCISER Partial Stroke Testing Step 3

XRCISER Partial Stroke Testing Step 4

  • No spurious valve travel
  • Full actuator torque output every cycle - inducing partial stroke test
  • Full emergency operation capability
  • Local, remote or fully automated control options
  • Optional diagnostic data collection
  • Inherent actuator seal and solenoid valve redundancies
  • Verification testing of solenoid valves
  • Unlimited number and frequency of worry free partial stroke test cycles
  • Reduced operator training

Inadequate Methods

MECHANICAL hard stop devices require a purpose built actuator with integral manually engaged travel stops or add-on type manually engaged stops mounted between actuator and the valve.

  • Hard travel stops to prevent spurious over-travel
  • Full actuator torque output to operate a valve experiencing stiction
  • Requires extensive operator training and detailed procedures for both engagement and disengagement operations
  • Cannot be immediately disengaged should an emergency shutdown (ESD) occur during partial stroke testing - compromising safety!


AUTOMATED partial stroke testing devices allow local or remote control of the PST by exhausting a portion of the actuator air supply to regulate actuator travel.

  • Reduce operator training requirements
  • Automated control options
  • Available diagnostic data collection
  • Redundancy
  • No hard travel stops
  • Regulating pressure to the actuator through controlled exhaust, greatly reduces applied actuator torque
  • Valves experiencing stiction may cause timed out false failures; or spurious over travel and process interruption
  • Slow release of pressure on larger assemblies greatly extends the stroke time and inhibits rapid ESD closure - compromising safety!

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