Visual and Basic Verification
Visual Inspection: Check the surface finish of the valve body and the integrity of the coating; ensure the absence of surface defects such as dents, sand holes, or cracks.
Valve Body Marking Verification: Verify permanent markings on the valve body-such as nominal pressure, nominal size, flow direction arrows, and manufacturer information-to ensure they are complete and accurate, thereby preventing misuse during subsequent installation.
Critical Dimension Re-measurement: Use tools such as vernier calipers and micrometers to re-measure critical parameters-including flange connection dimensions and valve stem coaxiality-to confirm compliance with design drawing specifications.
Operational Performance Testing
Opening/Closing Torque Test: Use a torque sensor or high-precision torque wrench to measure the operating torque during the full opening and closing cycles; ensure torque values do not exceed the maximum design thresholds and that operation is smooth without binding.
Travel and Limit Verification: Verify the positional accuracy of the butterfly disc at full-open and full-closed positions; confirm that the travel limits of the drive mechanism (electric/pneumatic) are accurate and free from issues such as over-travel or incomplete travel.
Operational Flexibility Test: Operate the butterfly valve multiple times (manually or via the drive mechanism) through its full range of motion; confirm that the butterfly disc rotates smoothly without sticking, abnormal noises, or other irregularities.
