Plumbing Question

[Delphinus]

I was just going to say, bandit beat me to it. It's counter-intuitive but the more a pump has to "lift" water, the less electricity it consumes. It's the speed of the motor that draws the power, and if it's working harder, it's spinning slower. Adding a flow control valve on the output of the pump is thus usually OK and causes you to use less electricity. Only thing is the noise and the heat.

Putting a flow control valve on the **input** side of a pump though is a big no-no. "Pumps push, they don't suck." Ie., having to push harder is OK, but having to suck harder will indeed burn out the pump.

[Phanman]

thx Tony

[Delphinus]

Oops, sorry, missed your other question. I think any pump that has an impeller that spins would be considered centrifugal. I don't know what a positive displacement pump is but if I would hazard a guess I would think that we're talking about piston-type or peristaltic-type pumps where a set volume of fluid is drawn in and then physically pushed out.

So anyhow unless I'm way off I would say your Mag drive is a centrifugal pump.

[Phanman]

thx again Tony