Boiling in Quick Cooldown Loop

[Jason C Wells]

I have a Varian/NRC HS-2 diff pump. It is equipped with a quick cooldown cooling loop. I have a needle valve on this loop to stop and start water flow as needed. I can hear that there is boiling going on inside this loop during normal operation. If I crack the needle valve slightly I can suppress the boiling at the expense of taking some heat out of the boiler. I can imagine that dissolved impurities in the water will eventually clog this cooling line.

What do you do about boiling in the quick cooldown loop on your diff pump? Something? Nothing?

I have returned to active experimentation after a hiatus.

Regards,
Jason C. Wells

[John Futter]

Jason
Let the cooling loop empty of water while running with a dump tap
the loop is supposed to be empty of water while the pump is in normal pump mode

Or do not use water but shop air to cool

[Dennis P Brown]

Agree with Mr. Futter; also, if you allow the DP to always cool before opening to air, a rapid cool down is not needed. Allowing water to flow into the DP during operation is not good - it will rob DP performance a great deal.

[Jason C Wells]

Thank you sirs.

Jason