Certain stations run high no matter what machine is put there.
pressure at port seems ok (3-6psi ). Machines run fine on acid jugs. wtf

Install white check valves on the inlet side of the acid and bicarb pumps. This will decrease the pressure from loop. The head tanks at one of my clinics are almost 20 ft high so there is alot of pressure. Installing the white checks valves brought my conds down from 14.0 to 13.6

are you using the strong spring in your acid pump?

Machines already have check valves installed, even put in new ones. We have olc/diasafe so the pumps have two weak springs. The problem is its only at two or three stations, no matter what machine is put there.

just to clarify-They run fine on jugs at those stations or in the machine repair room?
Thanks

The problem is on the floor, the machines run at 14.6 from the wall, when they plug the acid in a jug it drops to 14.0 or less, in the tech area everything is on jugs and normal. Have already tried pumps, check valves, calibrations, pressure at wall is 4-6 psi, checked drains----everything seems normal, even replaced drain connection, we have quick disconnects, thought maybe it went bad, no change

I'm stumped. Couldn't be drain restriction if they run fine on jugs at that station. Can't think of anything besides pressure sorry.

reduce wall pressure see if that helps. use a regulator if you got one crank it down to a drip to rule out pressure

Had the same problem cal. acid and bicarb pumps without check vales in line and then put back in after cal and try on that station work for me

Mr. Mech is your acid loop a vertical feed system if it is check the presure coming out of the wall you should get about 4-6 psi If it is realy high you might want to lower it to reduce presure coming out of the wall.

Mr Mech - FYI - if you have to calibrate your acid pump with the Buret, do it without the check valve. Otherwise you won't get an accurate reading.