Tools for Visual and Dimensional Inspection
Basic visual aids:High-intensity flashlights and magnifying glasses, used to detect minor surface defects such as sand holes, cracks, and coating flaws on the valve body.
Standard dimensional measuring tools: Vernier calipers, micrometers, steel rulers, and thickness gauges, used to verify flange thickness, stem diameter, and critical mating dimensions.
High-precision measuring equipment: Coordinate Measuring Machines (CMM), used for precise verification of form and position tolerances and installation datum dimensions for large-diameter butterfly valves.
Tools for Operational Performance Inspection
Torque testing tools:Valve torque testers and digital torque wrenches; capable of precisely measuring operating torque throughout the entire opening and closing cycle, suitable for torque verification of mainstream butterfly valves (DN50–DN200), with data storage and traceability to meet JB/T 13884-2020 testing standards.
Travel verification tools: Valve travel measuring instruments, used to check the accuracy of the match between the actual butterfly disc opening and the control signal, and to identify issues such as transmission mechanism slippage or loose connections.
Tools for Pressure and Sealing Inspection
Core pressure testing equipment:Valve pressure test benches, integrating hydraulic/pneumatic power sources, precision pressure sensors, and pressure stabilization systems; capable of performing shell strength tests at 1.5 times the nominal pressure and sealing performance tests at 1.1 times the nominal pressure.
Auxiliary leak detection tools: Bubble leak detection devices and high-precision airtightness testers, used to detect minute leaks at sealing interfaces and stem shaft seals, and to precisely quantify leakage rates.
