Pressure fluctuations, trigger gun problems and pop goes the relief valve

[Pressure fluctuations, trigger gun problems and pop goes the relief valve]

Murphy has come to visit me at the jobsite far too often this month. Aside from the Landa needing new bearings, I have a new issue to contend with.

While using the burner for the first time this year, I noticed while spraying down some walls that the pressure would fluctuate. It would begin by pressuring down to a gentle mist for a few seconds followed by a gradual buildup and then what seemed like an overpressure burst and then get back to normal. I noticed that a couple of times this happened, the over pressure burst would also create steam coming from the tip. (the thermostat was set at 200). I also noticed that the trigger gun would sometimes have trouble shutting off entirely. I would weep from the tip with a small stream before turning off. Other times it would shut off as soon as it was released. I thought maybe I had something blocking the nozzle or gun so I switched them out and the same thing happened with the other gun.

No noticeable pressure problems with the surface cleaner. At the end of the day I set the gun down and reeled up the supply hose. Boom! Hissssssssssssssssssssssssss... there goes the pressure relief valve.

I had a job the next day so I replaced the valve. I did not use the heater though I would have liked to. I checked the unloader and the pressure seems to be regulated correctly. The bypass was functioning as it should as well. I had the pressure guage on all day and the problem never repeated itself.

I had a couple things in mind to try. First of all have a replacement unloader that I thought I'd try. I also thought I'd try descaling the coil in the event there was an obstruction there. Is there anything else I should consider?

It's not good to let the unloader unload for more than three minutes. I found that some of my crews where setting up as they should including firing up the pressure washer. Kept having this problem even on pumps that where only a month old. Made sure everyone knew the pressure washer only runs for 1 minute without you pressure washing problem solved.

[Commercial Chemical Applicator License (??????)]

Give me your opinion on this. I think this definitely applies to this industry and could be enforced. We all know how we all say we are licensed well this is the only license the government has for us and I say again I think I applies. Please provide feedback. This is the license we will use after December 17th.