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What is the purpose of this hose valve on my well pump? It is standard garden hose shutoff valve. I do have a pressure vessel that sits on top of the pump that feeds my irrigation system as well as an outside hose bib.

-----
     |
     |    Pipe 1 (centered on pump)
Jet  |--------------------------------- To well
Pump |
     |---------------------------|----- To well
     |    Pipe 2                 | 
------                          Hose
                                Valve
  • 1
    It's probably either for priming the pump (input) or for seasonal or maintenance draining (output). – isherwood Jul 14 '17 at 14:18
  • Do both lines draw water from the well or does one act as a return line? – Freiheit Jul 14 '17 at 14:22
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You mention that it's a jet pump - so the valve is probably for priming the jet. The centered pipe is suction, the off-center pipe is the jet feed.

In my opinion, jet pumps are well on their way to being a holdover from times past, when electric motor reliability was questionable, and submersible electric motor reliability doubly so - they trade complexity and inefficiency of operation to keep the motor out of the well - a portion of water is pumped down to the jet, to help bring up more water from a depth where straight suction won't work. As such, when starting one up, you need to put water into the jet pipe (without having a working pump...complex, not fun.)

With current technology, when time comes to replace a jet pump you will almost always save considerably on operational costs by changing to a 2-wire deep well submersible pump with a single output pipe. However, it's generally not worth doing that if your jet pump is working well at present.

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