I have an API 6D ball valve that shall sustain 450 bar @ 70°C. This presseure is over CL2500.  Gas service, none corrosive.
Client specification stipulated that it shall be an uprated valve.
Without commenting directly on a possible choice, this seems to me the classical case where an end user/client tries to avoid a correct technical classed (allowed and certified product) and seeks a lower priced product that either is non-existent or commercially not available at the price wanted and / or not allowed under the given technical conditions.
If this is the case, there is only one way out: present cost and technical consequences in clear text for the customer (in writing), and ask for his decision on the matter.
On the other hand, the description might be (as it often is) an adaption or from an older plant or description, but where 'something' is slightly changed.
Antway, if the answer insists on 'cutting corners' and allow 'non allowable products' I would definitely not say yes for myself and my company.

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