Pillar 7 of 8 · Ultrasound Inspection Methodology
Ultrasonic Valve and Piping Component Inspection in Kazakhstan
📸 Photo: an inspector with an ultrasonic sensor checking an industrial ball valve or safety valve on a pipeline at an oil & gas processing facility
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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.
An ultrasonic sensor is placed on the valve body on both sides of the seat. Comparing the "before" and "after" signals gives a clear answer: the valve is holding (the downstream signal is significantly lower) or passing (the signals are comparable — turbulent flow through a defect). The method works for any type of valve — 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.
Positioner inspection
Diagnostics of control valves with pneumatic and electric positioners: assessing seat tightness at end positions and stroke dynamics without dismantling the actuator.
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 properly closed valve: the downstream signal is significantly lower than upstream. A leaking valve: the signals are comparable, with turbulent flow generating a signal on the downstream side. The difference in dBµV gives a quantified leak assessment.
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
Leaking valves cause losses of raw material, product, or energy carrier. Finding and replacing one defective valve pays for the instrument.
Safe inspection of aggressive media
Non-contact diagnostics through the valve body wall is safe for valves handling aggressive media, hazardous gases, acids, 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
Traditionally, valves are replaced on a fixed schedule regardless of condition. Ultrasonic monitoring lets you replace only genuinely defective valves, cutting costs by 40-60%.
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
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