My job is to functionally test our design and give feedback.
The customer spec and leakage rate for the seat test seems to be based on Ball Valve results and not reachable for plug type valves.Also since this valve is to be used in Dredging application it might not need a very tight leakrate on the seat test? (IMHO)
What is your general idea of 'my honest opionion'?comparing reference could be some of the plug-valve producers in general, not only the lift and turn-types.
If your customer comperes to double eccentric plug-valves with soft sealings, theese could be supplied drop thight up to ceratain limits and pressure classes because of the soft sealing and double eccentric construction.
With metal seated valves you will always have a leakage.

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