Engine coolant extractor/injector with double shut-off coupling
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United States of America Patent
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Jun 27, 1995
Issued Date -
N/A
app pub date -
Mar 11, 1994
filing date -
Sep 16, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for extracting and injecting liquid coolant from and into a reservoir for an engine cooling system. The apparatus includes a storage tank for the liquid coolant, and an air pressure system for selectively applying fluid pressure to the tank either above or below atmospheric pressure. A hose connects the tank to the engine cooling system reservoir through a double shut-off-type coupling. One part of the coupling is connected to the reservoir, and the other, to the end of the transfer hose each having its own independent shut-off valve. When the coupling is connected, the valves in both components are opened and conversely when the coupling is disconnected, the valves automatically close.
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