Right so this is what id do then.
Fit the sprayer with a car tyre valve. Just drill a 10 mm hole and pull it through just like the tyre fitters do.
Start filling the sprayers vessel slowly with compressed air via a tyre inflator(the type yout Ats,Kwik fit type places use.
You can monitor the pressure in the vessel and see at what Psi the blow off valve triggers if there is one fitted.
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Hello Tosh got Toshiba
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