| 摘要 |
An air supply and control assembly for use with a spray gun comprises an assembly to couple a first source of pressurized air which controls the needle valve of a spray gun to a pilot valve connected to a second source of pressurized air to control delivery thereof to the spray gun atomizing component. The assembly includes a manifold connected by one port to the first source of air, by a second port to components operating the needle valve, and by a third port to a coupling passageway connected to the pilot valve. A check valve in the coupling passageway allows air from the first source to flow freely to a chamber in the pilot valve which, on receipt of air from the first source, opens to flow air from the second source to the atomizing component, and impedes return flow of air from the chamber back to the manifold after the first source of air has been discontinued which thereby keeps the pilot valve open to continue flow of air from the second source to the atomizing component for a selected time period until all of the air from the first source in the pilot valve chamber has escaped. The check valve is adjustable to alter the time delay of the pilot valve in closing. To provide a high volume low pressure (HVLP) supply of atomizing air to the atomizing component a venturi member draws ambient air in to combine with pressurized air from the second source.
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