time for soap to get to the wand

[JustClean]

Hi all
It takes about 20 seconds for my low pressure soap and about 15 seconds for my high pressure soap to get to the wand after switching. Is this within the normal range or how are your numbers? I am using Mark7 equipment with Flojet pumps. The reason why I ask is because some @#$% complained it took too long and I should increase the time to make up for it. I just said I did this already and normally he would get less time!

 

[MEP001]

I keep it adjusted to about 12 seconds on the low-pressure. Assuming you have aerated low-pressure, you can reduce the changeover by increasing the air pressure but reducing the air flow. I created a blow-down for each bay so that if the customer uses tire cleaner or presoak first, it hits the gun in about 4 seconds.

The high-pressure is directly related to the length of the hose from the pump to the bay. The closest one takes a few seconds, the longest takes 17.

 

[JustClean]

you can reduce the changeover by increasing the air pressure but reducing the air flow.

I am not sure if I understand. I can adjust the chemical pump and I think the air pressure. Where would I adjust the air flow?

I created a blow-down for each bay so that if the customer uses tire cleaner or presoak first, it hits the gun in about 4 seconds.

That's interesting. How did you do this?
Thanks. Cheers Justclean

 

[Jeff_L]

JustClean - use a needle valve to adjust the volume of air while maintaining the pressure.

 

[MEP001]

The equipment has a common air solenoid for both tire cleaner and presoak, and I was already adding a PLC to each bay for another purpose, so I used an extra output which turns on only the air for 30 seconds after the bay has been idle for a minute. I discovered on accident while I was testing something that it greatly reduced the time for low-pressure applications to reach the tip if there was no water in the way.

 

[Bert]

Your solenoids should have a metering screw near the outlet port so you can make that air adjustment without adding needle valves.