Pressure Relief Valve Service You Can Trust

Stranco's Valve Division delivers dependable NBBI VR * T/O support for pressure relief valves with a focus on safety, compliance, quality, and turnaround.

When pressure relief valves are critical to safe operation, every repair, test, and certification matters. Stranco’s Valve Division supports customers with precision-focused service designed to help maintain performance, documentation confidence, and operational readiness.

PSV/PRV Services

Repair and Testing
Inline Testing and Set Pressure Adjustment
Field Technicians Certified
NBBI VR Certified Shop and Field
NBBI TO Certified Shop and Field
Portable Test Stand
Safety Valve Rentals
New Valve Sales

Why Choose Stranco for Pressure Relief Valve Services?

Over 40 Years of Expertise

Reliable, Safe, and Certified

Variety of Equipment

Frequently Asked Questions

Can Stranco test pressure relief valves in the field?

Yes. Stranco can support field testing of pressure relief valves when the valve configuration and site conditions allow it. Valves with an appropriate test connection may be tested inline, and Stranco can also provide field testing support using mobile/portable test equipment. For valves that require removal, repair, disassembly, or full shop evaluation, Stranco can support shop or field service under its applicable NBBI VR and T/O scope.

What is the difference between NBBI VR and NBBI T/O certification?

NBBI VR authorization applies to the repair of pressure relief valves and allows an accredited repair organization to apply the VR symbol stamp within the limits of its certificate. NBBI T/O authorization applies to testing pressure relief valves, including confirming seat tightness and confirming or restoring nameplate set pressure or performance. T/O does not authorize disassembly or repair; those activities fall under the appropriate VR repair program.

How often should PSV/PRV valves be tested or inspected?

Testing and inspection intervals should be established by the owner/user based on the valve service, operating history, process conditions, applicable jurisdictional requirements, and recognized inspection practices. API 576 provides guidance for inspection, testing, maintenance, and recordkeeping of pressure-relieving devices, while API 520 and API 521 support proper application, installation, and system-level pressure relief design considerations. Stranco can help customers evaluate valve condition, documentation, and testing needs to support a compliant pressure relief valve program.

Can Stranco repair, test, and rectify pressure relief valves?

Yes. Stranco’s Valve Division provides pressure relief valve repair, testing, and certification support for applicable PSV/PRV valves. Services may include inspection, repair, set pressure testing, seat tightness verification, documentation, and return-to-service support. When repair work is required, it should be performed under the proper NBBI VR scope so the valve remains traceable and properly documented.

Why is proper PSV/PRV documentation important?

Pressure relief valve documentation is critical for compliance, traceability, inspection planning, and safe operation. Proper records help confirm valve identification, set pressure, test results, repair history, service conditions, and certification status. In turnaround, audit, or incident-review situations, complete PSV/PRV documentation helps operations, maintenance, reliability, and inspection teams verify that each valve is properly maintained and ready for service.