Unsure about hookup for rotary pump

#1: Post by **mbuemi1577** » November 22nd, 2006, 11:59 pm

I have seen some discussion the use of a water pressure regulator and gauge. Is this necessary? What does it really do?

#2: Post by **dorkboy** » November 23rd, 2006, 1:39 am

I just got my Vetrano last week and hooked it up saturday. I had to run to homedepot for a $3 piece and that was that. I have a 6 stage water filter for it. My apartment water pressure is 70psi, on the Vetrano it says its 4.75 Bar. I did a bit of tweeking and when its running its just under 9 bar. Everything seems to be working perfect, but I am not a pro.

November 23rd, 2006, 1:44 pm

You may want to read the Water pressure and the effect(s) it may have on rotary pump.

#4: Post by **Psyd** » November 23rd, 2006, 3:31 pm

mbuemi1577 wrote:I have seen some discussion the use of a water pressure regulator and gauge. Is this necessary ? What does it really do?

The regulator, well, regulates, and the gauge shows the results of the regulation. WARNING! RUMOUR CONTROL! I've heard that a rotary pump doesn't want to see much more than 3 - 3.5 Bar on the input site, and that the regulator is used to insure that. A regulator will also insure that the pressure that you see going into the pump stays the same, and doesn't depend on whether the car wash down the street is running or not to be right.

November 24th, 2006, 1:30 pm

where exactly does the regulator install to? after the filters and before the machine? or before the filters?

i havent received the machine yet, but figuring i should i have ordered these when i saw them, do i need 1/4" or 3/8" sized regulator to go with the vetrano water softener and filtration kit?

thanks for all the great links and advice so far.

#6: Post by HB » November 24th, 2006, 4:26 pm

mbuemi1577 wrote:where exactly does the regulator install to? after the filters and before the machine? or before the filters?

The regulator is before the machine and after the filters. Having installed both types of filter systems, I prefer the 3/8" lines because the pressure drops less during a boiler refill. The Elektra A3 rotary pump complained loudly during a boiler refill when I hooked it to 1/4" lines. It was blissfully quiet with the 3/8" lines.

#7: Post by **mrgnomer** » November 25th, 2006, 9:37 pm

I think a rotary pump allows water to flow through so any line pressure or irregularity will affect output pump pressure. I've got a regulator hooked up just before the Vetrano and when I open up or close the regulator both the idle pressure and pump pressure go up and down respectively. I've read too where preinfusion of an e61 with a rotary pump operates best at about 28 or so psi. So, to ensure irregular line pressure doesn't affect pump pressure output and to maybe aid in preinfusion a pressure regulator is a good idea.

#8: Post by HB » November 25th, 2006, 9:49 pm

mrgnomer wrote:I've read too where preinfusion of an e61 with a rotary pump operates best at about 28 or so psi.

Unless you move the lever to the half position where the valve has opened but the pump hasn't engaged, it won't matter, since once the pump has started, it's providing 9 bar output in a flash. The E61's expansion chamber is what provides the preinfusion (the patent explains how in gory detail). That said, I agree with you, there's certainly no harm in installing a pressure regulator, if only to assure a more constant inlet pressure. I regulate mine to ~25 PSI.