My ball valves have a nut on the handle. I was over the nut falling off about 4 1/2 years ago and started doing the same thing on all new ones before I ever even hook them up. All my guns(wands) and surface cleaners all have zip ties holding the triggers on. I got tired of using a tennis ball and or a cable clamp. The balls would always fall out and the clamps were always in the way.
We always use an open gun. I have 2 to 3 man crews when using a open gun for safety issues. Reason is this... our pumps have lasted 16 years with only once changing out the rings. ( That was the 16th year ). I believe the reason is this:
We always have used a open gun. Though we have an unloader, it is solely for safety reasons, along with the high pressure and high temp switch. I believe that by using the unloader, shutting off and on the flow, for a
millisecond, you are creating a massive surge of pressure before the unloader can react. This constant off and on tends to "Wear Down" the pump/ O Rings/ hoses/ and unloader. Also, having the boiler come on, then off, then on, then off, in a matter of minutes is just not an ideal situation of a boiler. I have seen guys use that trigger as if it was a squirt gun.
I also believe people do not "Cool Down " their equipment properly. Just stopping it after a work out is not a good thing. Pitchers in Baseball have to warm up before they pitch and then cool down afterwords properly. We warm up our equipment 5 minutes before full use by turn on the engine at low to mid RPM's. Fill the pressure hose line with water ( Get all the air out and the substance that may be in the line).
In shutting the unit down, we cool the boilers down to 130 or less degrees before shutting off the flow of the water. Then we cool down the engine at 1100 RPM's for 3+ minutes ( 900 rpm is idle). Our Boilers usually last 8 to 10 years. Our previous engine is still running after 18 years. (a 3 cyl Kubota D700 ) However, I do not know about these new 3/4 inch Boilers. So far, 3 years on the first rig, and still going strong.
Take this for what it's worth. Many of you may think it is hogwash. But if your equipment dose not last as long, maybe there is some truth in what I have said here. LOL