Which device type requires a test draft of at least four times the minimum volume?

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The test relies on understanding how flow characteristics affect measurement accuracy during a verification draft. Slow-flow devices are particularly sensitive to transient effects, such as piston inertia, valve stick-slip, and stabilization time. At low flow volumes, these factors can dominate the reading and produce larger relative errors. By using a test draft of at least four times the minimum volume, you push the device into a steadier, higher-flow region where those transient influences are averaged out and the flow has time to stabilize. This leads to a more reliable verification of the device’s accuracy across its operating range.

Other device types operate at higher flow rates or have shorter stabilization needs, so they don’t require such a large multiple of the minimum volume to achieve an accurate reading. That’s why slow-flow devices are the ones that specifically require a test draft of at least four times the minimum volume.