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The hole allows inlet water to fill the chamber above the piston which forces the piston down against the valve seat. I've not experienced good reliability with the O453P in low pressure applications. It's a high pressure valve requiring a 10psi min inlet pressure. A better choice for weep...

Oh...I forgot you're not in "irrigation country". Our landscaping would not survive with our sprinkler systems. Yeah...they're extremely reliable. I can't remember repairing more than 4 out of the 60some Rainbirds I've owned. And, all they needed were diaphragms. At one property I've owned...

Of all my solenoids, the Rainbird's are by far the most reliable. And, they're always in stock at Home Depot! Too bad their specs indicate Max temp of 110F! :)

Piston valves require slightly higher inlet pressure to maintain closed position. This means they don’t always close in gravity feed installations. Diaphragm valves tend to open and close more slowly than piston valves and are more likely to suffer from failure due to chemical degradation of...

It sounds like the outlet plumbing has a leak somewhere, allowing the plumbing to drain between applications. Pressure is created at the tip(s). If the outlet plumbing is empty it will take a few seconds for water to fill the line and for the pressure to build to the desired setting. Look for...

As noted on the linked parts explosion, the outlet valve is included in the 22911A Unloader and excluded from the 22911AR Regulator. Now...it's been awhile...but every MkVII Proline system I've ever worked on had issues with siphoning IF the Unloader outlet valve o-ring or spring was broken or...

The Giant yellow spring unloader has a spring loaded outlet valve…basically, a low pressure check valve. When the pump is idle, the unloader’s outlet valve closes. Since the system is gravity fed, that outlet valve should stop the siphon. Most likely, the outlet valve’s o-ring or spring is...

Earl, Wouldn't applying a neutral foam dilute your low ph detergent...possibly reducing it's effectiveness?

HP hose: Boom outlet to floor PLUS 3 feet FB hose: Boom outlet to floor PLUS 4 feet

YIKES! Using my cost and dilution ratio for tire cleaner... that would cost almost 17.5c per minute! I deliver thick-rich tire foam through a separate "foam gun"... at 6 oz per minute it costs about 2c per minute.

and...remind me, how large is the solenoid valve oriface?

4+1 has potential peak water flow of nearly 40 gpm 1" Fleck 9000 peaks at 28 gpm with a 25psi pressure drop! Probably should consider a Fleck 1.5" 9500

IIRC...there's a 3-pole relay that might have a burned contact. Swap the relay with a working vac and see if the problem follows. If it's a round Monorail, the relay is soldered to the timer circuit board...the Molex plug might have a melted connector.

I assembled and incorporated a blow-out/antifreeze system for my foam brushes and lp foam guns using a programmable logic relay as the controller. It works great. Below the temperature set point and 10 seconds after use, the brush or gun gets a 10 second blast of air…then, a 5 second injection...

While my reply does not focus on your specific product, I know that many operators have equipped their facilities with separate guns for a variety of products...conditioners, polishes, pre-soak, bug cleaner, tire cleaner, etc. I personally have a separate low pressure gun for two products...

Are the pumps pressure or gravity fed? If they're gravity fed, why the Flojet?

Run the bay on Soap Switch to Wax for 10-15 seconds Switch to Rinse Once the wax clears the line, does the rinse water still have suds? If so, the hoses are old and absorbing soap. It takes a long time for the rinse water to clear the absorbed soap...especially since it's now soft water...

I think Mep001 nailed it. The car wash has been operating on hard water for over a year.(?) The change to soft water has made the soap-saturated hose issue more visible. The “wax before rinse” test will verify his analysis. Good call Mep001! The good news is that after you replace the...

Maybe the previous owner had a problem with the weep system check valves? And, the softener is full of soap? And, rather than fixing it, he just bypassed the softener? Try bypassing the softener and the boiler, drain and refill the rinse tank and see if the problem goes away?

If those manual valves are truly closed...then my diagnosis is incorrect. But, since you found other faulty check valves, it's an easy inspection. Remove the weep supply line from the check valve and turn the pump on.