XRCISER® Partial Stroke Testing Device
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.
- 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
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
- 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!