Chapin's new 20V Backpack Sprayer

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ajmikola
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Re: Chapin's new 20V Backpack Sprayer

Post by ajmikola » July 15th, 2016, 8:47 pm

The dfw tip setup on the stock wand from the chapin electric backpack:
ImageUploadedByYard Help1468630008.108449.jpg
Looks pretty good to me:
ImageUploadedByYard Help1468630030.136171.jpg

My mower on the other hand:
ImageUploadedByYard Help1468630050.312485.jpg

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Re: Chapin's new 20V Backpack Sprayer

Post by LoneRanger » July 15th, 2016, 8:56 pm

^ You don't have the 45 bend on it though.

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Re: Chapin's new 20V Backpack Sprayer

Post by ajmikola » July 15th, 2016, 11:52 pm

You are absolutely right, i just tried it and it doesnt work with 45 degree angle. It leaks everywhere!
What on earth!?!?!?


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Re: Chapin's new 20V Backpack Sprayer

Post by HitEmTrue » July 16th, 2016, 3:33 am

ajmikola wrote:You are absolutely right, i just tried it and it doesnt work with 45 degree angle. It leaks everywhere!
Chapin threads aren't quite the same as teejet.

I received my chapin CF valve tonight, and it comes with an adapter that works. You only need the adapter, but getting the chapin cf valve is the easiest way I've found to get it.

I posted more details in the sprayer wand thread.

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Blue Teejet Tip= Fail

Post by Southernguy311 » August 3rd, 2016, 6:59 am

Wanted to share my experience trying the blue teejet tip. Since the flow was greatly reduced compared to the red, the pump cycled/pulsed in and out resulting in a very uneven coverage similar to when a tip is clogged. Not sure if anyone had tried to use the blue at this point, but I think I'll stick with the red or brown for this particular sprayer setup. Perhaps the blue tip would work in a 2 nozzle setup? Not sure, but was a fail in this one. I'm going to order a new wand for my 2 gallon pump up and convert it for inside pest control and put those blue tips to use for that.


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Re: Chapin's new 20V Backpack Sprayer

Post by seiyafan » August 3rd, 2016, 8:35 am

+1 I tried several tips before settling with the brown.

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Re: Blue Teejet Tip= Fail

Post by Ware » August 3rd, 2016, 9:42 am

Southernguy311 wrote:Wanted to share my experience trying the blue teejet tip. Since the flow was greatly reduced compared to the red, the pump cycled/pulsed in and out resulting in a very uneven coverage similar to when a tip is clogged. Not sure if anyone had tried to use the blue at this point, but I think I'll stick with the red or brown for this particular sprayer setup. Perhaps the blue tip would work in a 2 nozzle setup? Not sure, but was a fail in this one. I'm going to order a new wand for my 2 gallon pump up and convert it for inside pest control and put those blue tips to use for that.


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This sort of surprises me, as it's only one size smaller than the red - 0.26 vs 0.35 GPM @ 30PSI. I often use a yellow tip for spot spraying w/Celsius (although not with the Chapin 20V). With a brown tip you're approaching 0.50 GPM - or only 8 minutes of spray time between fills.

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Re: Chapin's new 20V Backpack Sprayer

Post by LoneRanger » August 3rd, 2016, 9:49 am

^, ^^, & ^^^ Quick tip - Use a proper CFV and this will not happen. The sprayer will still pulse but, the pressure will be constant at the tip. CFV regulation above ~27PSI may not operate properly with this sprayer, because of pressure losses before the CFV.
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Re: Chapin's new 20V Backpack Sprayer

Post by Ware » August 3rd, 2016, 9:54 am

^^^

Pulsing a positive displacement pump can result in premature failure. The 'pulsing' is the pressure switch chattering.

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Re: Chapin's new 20V Backpack Sprayer

Post by LoneRanger » August 3rd, 2016, 10:30 am

The issue experienced by the previous posters is chatter or close to it. The CFV will stop the chatter and pulse the motor @ ~1 second on/off.

P.S. This scenario is using a 21PSI CFV. Using a lower PSI CFV will decrease the on time and increase the off time. However, it will be minimal.
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Re: Chapin's new 20V Backpack Sprayer

Post by seiyafan » August 3rd, 2016, 10:31 am

A somewhat related question, when the tank is near empty the pump would do extra work, should you try to pump out as much as possible or just forgo the remaining liquid?

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Re: Chapin's new 20V Backpack Sprayer

Post by LoneRanger » August 3rd, 2016, 10:33 am

As soon as pressure or flow is lost, reach back and turn the switch off. Otherwise, over a long term it can damage the pump.

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Re: Chapin's new 20V Backpack Sprayer

Post by Ware » August 3rd, 2016, 11:01 am

Does the Chapin 20V have a PRV bypass? If not, using a CFV may not be advisable.

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Re: Chapin's new 20V Backpack Sprayer

Post by LoneRanger » August 3rd, 2016, 11:36 am

No it does not. If it did, the pump would operate continuously and drain the battery very quickly. The sprayer was not designed for a CFV. However, if you want proper pressure/flow and a consistent pattern, a CFV is the only option.

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Re: Chapin's new 20V Backpack Sprayer

Post by Ware » August 3rd, 2016, 12:16 pm

Charley wrote:...I talked with one of the engineers who told me that this sprayer was not set up for use of the CF valves in the first place.
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Re: Chapin's new 20V Backpack Sprayer

Post by LoneRanger » August 3rd, 2016, 12:50 pm

Ware wrote:
Charley wrote:...I talked with one of the engineers who told me that this sprayer was not set up for use of the CF valves in the first place.
Hence I posted,
LoneRanger wrote:.. The sprayer was not designed for a CFV.

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Re: Chapin's new 20V Backpack Sprayer

Post by Southernguy311 » August 3rd, 2016, 7:19 pm

So back to what I was saying. Use the red or brown tip for this sprayer and you will be good. With both of those tips I've experienced very even flow without the use of a cfv

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Chapin's new 20V Backpack Sprayer

Post by Redtenchu » August 3rd, 2016, 7:40 pm

Southernguy311 wrote:So back to what I was saying. Use the red or brown tip for this sprayer and you will be good. With both of those tips I've experienced very even flow without the use of a cfv

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thanks for the tip (pun intended).

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Re: Chapin's new 20V Backpack Sprayer

Post by Ware » August 3rd, 2016, 7:42 pm

Southernguy311 wrote:So back to what I was saying. Use the red or brown tip for this sprayer and you will be good. With both of those tips I've experienced very even flow without the use of a cfv

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+1 :good:

Any excessive flow restriction (via an undersized nozzle and/or use of a CF valve) on the output of a positive displacement pump without a pressure relief can result in short-cycling the pressure switch.

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Re: Chapin's new 20V Backpack Sprayer

Post by Southernguy311 » August 3rd, 2016, 7:47 pm

So at least we've established this sprayer does have some limitations despite the overall ease of use and convenience.

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