How does a by-pass plug in an oil pump work?

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Old 04-23-11, 12:23 PM
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How does a by-pass plug in an oil pump work?

When converting a single-line pump to dual-line, e.g. in connection with a TigerLoop installation, the pump is converted into dual-pipe supply/return mode using a bypass plug, which is threaded into the return connection, at least in the Riello we have. I will be having someone else do this work -- as soon as I can find a company that knows Riello and believes in using metric tools with metric fasteners, which is easier said than done in my neck of the woods. However, I'd still like to understand how a bypass plug works. How does it do what it does? What's going on inside the pump when the plug is threaded into the return connection?
 
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Old 04-23-11, 12:45 PM
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Oil burner pumps are constant volume pumps and they are sized to provide more oil than is actually burnt. Since oil is non-compressible the "excess" oil (that which isn't forced out the nozzle to burn) MUST go somewhere and that somewhere is either back to the tank or back to the pump suction.

A pump set up for a single line operation has the bypass plug removed which then opens a passageway back to the pump suction. Inserting the bypass plug closes the internal passageway and then the excess oil will travel back to the tank via the return port and tubing. In your case the "return" will go back to the Tiger Loop which acts as a mini oil tank.
 
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Old 04-23-11, 07:21 PM
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Thanks for the explanation.
 
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