Is there any damage done to a typical engine driven bilge/washdown/fire pump (like a Jabsco) if it runs against a closed valve? If so, then perhaps a safety release valve can divert the water overboard until the wash down hose is opened or such.
The motor will add heat to the little bit of water inside of the pump casing. Enough to do damage? Maybe. Never tried it or seen it done. I can't recall seeing that type used where the discharge is closed off completely. Engine S/W pumps, macerator pumps, and oil change pumps are all open ended discharge.Is there any damage done to a typical engine driven bilge/washdown/fire pump (like a Jabsco) if it runs against a closed valve? If so, then perhaps a safety release valve can divert the water overboard until the wash down hose is opened or such.