“The in-situ testing solution for re-certification of pressure relief-/safety valves"
The PREVENTEST NEXUS is an Auxiliary Lift Assist Device (ALAD), developed to make in-situ testing of spring-operated Pressure Relief- Safety Valves (PRVs) simpler, smarter and more efficient. It allows testing of virtually any type and size of PRV under normal operating conditions – whether the medium is steam, gas or liquid.
Following ASME’s Performance Test Code (PTC) 25, this method provides a safe and reliable alternative to traditional bench testing. The big advantage: PRVs can be functionally tested without removal, as long as the procedure is done correctly and with the right equipment. ASME Section XIII supports this methode by defining the requirements for safe and compliant in-situ testing of PRVs.
PREVENTEST NEXUS transforms PRV re-certification: no shutdowns, cost savings, targeted maintenance, on-site testing – even for hard-to-reach valves – with full compliance support.
Built for the operator
At its core, the PREVENTEST NEXUS is powered by a robust software and database system preloaded with over 4,000 seat sizes from the world’s leading Pressure Relief- and Safety Valve manufacturers.
Every detail of the PREVENTEST NEXUS is built to empower the operators who use it, wherever the job takes them.
Ergonomic & lightweight
Built to reduce operator fatigue during intensive field work and testing procedures.
A double-acting hydraulic unit for controlled push–pull motion.
Ready for the toughest conditions
As the system is hydraulic-operated and battery-driven, it is fully off-grid capable and ideally suited for operation in remote or hazardous environments.
Effortlessly intuitive
Bespoke software, a comprehensive valve database and a user-friendly interface, that requires minimal training, so your team can get started faster.
The software supports multiple languages, enabling smooth operation for international teams.
Training on your terms
Expert instruction available on-site, in your workshop, or remotely – wherever you need it.
All in one
The complete set – expertly packed in rugged cases for secure and safe transport anywhere;
Test bracket.
Set of UNF/UNC spindle nuts.
Complete set of load sensors: 1,10,20 kN (*)
Lift- and acoustic sensor.
Hydraulic unit including connection hose.
Rugged laptop including PREVENTEST software.
Industrial wireless communication unit.
Quick Reference Guide.
(*) Optional: load sensor 50kN, set of metric spindle nuts.
Ahead of what's next
Ready to use straight out of the box, this compact and powerful device enables accurate in-situ testing of Pressure Relief Valves, no removal required. Supplied with a full set of accessories, it’s your complete field solution for fast, reliable PRV diagnostics.
With 700+ PREVENTEST units installed and 25 years of proven success in field use, training and sensor calibration.
As found testing
The set pressure is determined using a lift sensor and an acoustic sensor.
Pre-test crack test data contribute to the overall Pressure Relief-/Safety Valve assessment.
The software agenerates clear overviews comparing As Found results with post-maintenance or adjusted test results, supporting traceability and quality control.
Digital load sensors
A set of load sensors (1, 10, 20, 50 kN) covers the full measurement range and ensure high accuracy.
Load cells can be easily exchanged between devices without manual configuration. During calibration or maintenance, a spare or swap set ensures continuous operation and prevents unexpected downtime.
Seamless data & powerful reports
Test results are fully reproducible, tamper-proof, and automatically validated, with measurement findings available as digital and printed reports.
Automatic cloud backup, ensures test data can be securely stored, shared and protected.
Report templates can be customized to align with company standards, customer requirements or industry compliance.
Calibration services
Choose from multiple calibration service levels, tailored to your needs and delivered through our regional facilities for maximum convenience and efficiency.
Test smarter, stay compliant
Re-certification of Pressure Relief-/Safety Valves is mandatory. In-situ testing can support your risk-based assessments and complement traditional bench testing. That’s why Ventil offers alternative test solutions for PRVs, tailored to your specific needs.
Our experts help you choose the most efficient, compliant, and future-proof testing strategy. We ensure full alignment with industry standards, while prioritizing safety, flexibility, and operational continuity.
Experiences from the front lines
“Investing in the PREVENTEST NEXUS has significantly improved our testing operations.
After evaluating multiple solutions, the PREVENTEST NEXUS clearly stands out. Its advanced software, preloaded with over 4,000 seat sizes, ensures unmatched accuracy and consistency across all valve types. Real-time, high-precision force and acoustic data from the smart sensor box allow us to operate efficiently, even in challenging field conditions.
Easy to set up and requiring minimal training, the NEXUS has proven to be the most reliable and efficient investment for our in-situ Pressure Relief Valve testing needs.”
Rudolf Schneider
Maintenance Supervisor, Petrochemical Plant
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