Pump's quieter with some back pressure?

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Pump's quieter with some back pressure?

Postby flyboy320 » Tue 27 Apr, 2010 11:22

I have a Jandy 2hp single speed pump. I have downstream of the pump, a shutoff valve and I find if I turn the shutoff valve so it's about half way closed, and creating some back pressure, the pump seems to run much quieter. There still seems to be the same amount of water coming from the water jets, so I don't think it's reducing the water outflow much. Because the pump is located beside my house, I would like to run it as quietly as possible. So I'm wondering if running the pump this way can damage it, and is this a "normal" behavior for a pump?

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My Pool: 33k gunite, salt, sta-rite system 3, floor system
Location: DFW TX

Pump's quieter with some back pressure?

Postby acroy » Fri 30 Apr, 2010 15:48

I'm no expert but 'normally' pumps should run pretty quiet. Noise is usually an indication of cavitation. If it's cavitating with the valves wide open, it might not be getting enough flow on the suction side. Are all suction side valves open, all skimmers & main drain open?

Throttling it down on the outlet side is creating an artificial blockage in the line; flow must go down to an extent.
33k gunite, Clearwater salt, 1.5 & 1hp pumps, floor return jets, fountain, System3 DE, Dirt Devil ProV vac, borates. Soon: efficient pump(s), robot cleaner...

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