Pillar 7 of 8 · Ultrasound Inspection Methodology
Ultrasonic Valve and Piping Component Inspection in Kazakhstan
Ultrasonic valve leak detection — the seventh pillar of the ultrasound inspection methodology — finds internal leaks and stuck valves in 2 minutes without disassembly and without halting the process. A closed valve that passes flow causes direct losses of product or energy carrier, while a malfunctioning safety valve poses a safety risk to the entire site.
A contact ultrasonic sensor is placed on the valve body at three points: upstream of the seat, on the seat and downstream. A tight valve reads background level at all three. When the medium passes a leaking seat, the seat and downstream readings are clearly higher than upstream, because turbulent flow through the gap is loud in the ultrasonic range. The method works for ball, gate, globe, safety, check and control valves.
KEG TRK is the official SDT Ultrasound Solutions distributor in Kazakhstan. We supply detectors for valve and piping component monitoring at oil & gas, power, and manufacturing plants across the country. Training on the ultrasonic valve diagnostics methodology is included with every delivery.
Applications of Ultrasound for Valve and Piping Component Inspection
Full diagnostics of piping components without shutdown or disassembly.
Condition and leak assessment
Detecting internal leakage of a closed valve — fluid or gas passing through a loosely seated valve creates a turbulent ultrasonic signal. A clear result with no need to remove the valve or strip the pipeline.
Safety valve monitoring
Safety valves must open precisely at the set pressure and reseat reliably after blowdown. Ultrasonic diagnostics identifies valves that are simmering or not seating fully.
Control valves
Control valves in the closed position are checked for passing the same way as isolation valves. In service, ultrasound also picks up cavitation and heavy throttling that erode the plug and seat.
Check valve monitoring
Check valves that fail to seat fully cause recirculation and reduce pump and compressor performance. The ultrasonic flow-through signal clearly points to a defective check valve.
How to Perform Ultrasonic Valve Diagnostics
Three steps from sensor placement to a quantified leak assessment.
Attach the sensor to the valve body
A magnetic or contact ultrasonic sensor is attached to the metal valve body — on both sides of the seat to compare upstream and downstream signals. Setup takes 30 seconds.
Compare signals before and after the seat
A tight closed valve reads the same as upstream, or lower, on the seat and downstream. A passing valve reads higher on the seat and downstream than upstream, and the flow hiss is audible in the headphones. The dBµV difference and a signal recording give a baseline to compare on the next route.
Classify and document the result
Log the result in the database: good / minor leak / critical leak. The instrument stores an audio recording of the signal for comparison on the next round and trend analysis.
Benefits of Ultrasonic Valve Inspection
Replacement savings, safety, and documentation for plants in Kazakhstan.
Diagnostics without disassembly
No need to remove the valve, strip the pipework, or shut down the process line. The ultrasonic sensor is placed on the body — a result is ready in 2 minutes.
Inspection under operating pressure
All measurements are taken under full operating pressure. Safety and control valves can be checked right in live operation, with no need to pull them for repair.
Lower product and energy losses
Passing valves lose raw material, product or energy, and on lines to flare or drain nobody sees the loss. Ultrasound finds these valves on a running unit.
Safe inspection of aggressive media
The sensor sits on the outside of the body: the line stays closed and the operator never touches the medium. That matters for valves on aggressive media, toxic gases and superheated steam.
Documenting valve history
The instrument stores data from every measurement. A history of valve condition lets you plan replacement based on actual run time and condition rather than a fixed schedule.
Savings on scheduled replacements
Valves are usually repaired or replaced on a schedule regardless of condition. Regular readings show which valves are actually passing, so the repair budget goes to those.
Want to optimize your valve maintenance program?
KEG TRK specialists will help you choose the right instrument for your valve fleet type and size.
Request a consultationSDT Instruments for Ultrasonic Valve Inspection
From the entry-level ULTRAChecker to the professional SDT340.
SDT340
ProfessionalA multi-sensor platform for comprehensive valve diagnostics: ultrasound + vibration + IR.
Recommended for: Critical valves, comprehensive diagnostics
SDT270
Data & trendsAn advanced detector with data logging and trend analysis for a valve monitoring program.
Recommended for: Valve condition monitoring programs, trends
ULTRAChecker
Simple startA dedicated detector for basic valve diagnostics with no ultrasound experience required.
Recommended for: Basic valve inspection
SDT200
For beginnersAn entry-level detector to kick off a valve inspection program with instant audible feedback.
Recommended for: First step into valve diagnostics
Explore the Other Pillars of Ultrasonic Testing
The methodology covers 8 areas — one instrument handles every task.
Frequently Asked Questions About Ultrasonic Valve Inspection
Need advice?
Our specialists will help you choose the optimal SDT detectors for valve and piping component inspection configuration for your equipment.