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Question about sprayer rig by-pass valve

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PCC-AL

05-23-2002 04:15:24

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Someone recently posted a photo of their home-made sprayer rig that mounted to the 3 pt hitch of their tractor. It consisted of a pto pump, by-pass or pressure control valve, 55 gal drum mounted on a metal stand with a 3 pt hitch.
I am building a similar unit and have everything but the by-pass or pressure control valve. I priced a new valve at the local farm supply store. $69.95. This is nothing but a pressure release valve that is adjustable similar to the gas regulator on many applications. I'm looking for a substitute for this pricy item. Anyone have any ideas???? I haven't had any luck finding a used one.

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david

05-24-2002 12:11:50

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Re: Question about sprayer rig by-pass valve in reply to PCC-AL, 05-23-2002 04:15:24

Bought a top of the line brass by-pass valve for $49.99 a local ag dealer. Plastic was about $10.00 less. I think I've seen them at TSC and in Value-Built's catalog. Seems like they were about $10.00 less than local but it was one of those things I needed now.

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Frank

05-23-2002 19:19:50

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Re: Question about sprayer rig by-pass valve in reply to PCC-AL, 05-23-2002 04:15:24

Please describe this valve a little more. You should be able to get a pressure regulator for under 20 bucks.

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paul

05-24-2002 05:16:44

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Re: Re: Question about sprayer rig by-pass valve in reply to Frank, 05-23-2002 19:19:50

Generally they are plastic body, have a longish screw-in valve to adjust the spring pressure, which controls the pressure of the sprayer. Spray pressure is critical for fan-tip nozzles to get the proper spray patterns & droplet size to do a good job of broadcast spraying. Big drops miss a lot of the plants, tiny drops are much much more likely to drift in the wind or temp inversion.

Roundup is very corosive, so while this guy's use is not quite so fussy on droplet size (legally he needs to follow the label on application which means he does have to be a bit concerned about drift & sprayer pressure :) he can't use just any old pressure regulator. The parts will need to hold up to a very corosive solution.

Unfortunately I'm more of a problem finder than being able to offer good alternatives on this!

--->Paul

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PCC-AL

05-24-2002 02:13:31

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Re: Re: Question about sprayer rig by-pass valve in reply to Frank, 05-23-2002 19:19:50

Hi Frank,
The valve I looked at looks like a long water pipe tee.One of the holes has a spring loaded plunger in it that pressure can be increased or decreased by turning a small handle on the outside and compressing the spring. Basically, it seems to work like a water facuet except pressure allows the flow rather than manually turning a facuet handle. Thanks.

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Frank

05-24-2002 17:02:28

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Re: Re: Re: Question about sprayer rig by-pass valve in reply to PCC-AL, 05-24-2002 02:13:31

I work in a farm store and I'm somewhat familiar with spray rigs. We sell the Hypro line of fittings and I'm sure you can get a nylon pressure relief valve for less than 20.00 It's exactly like you described. You put this in your return line. Are you using a roller pump or centrifugal? If you have a centrifugal pump you don't need the spring loaded valve. A gate valve will work just as well.
I'll be away from my computer for the weekend but I'll be glad to answer any more questions when I get back.

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As usual, I didn't give enough info- PCC-AL

05-23-2002 11:02:15

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Re: Question about sprayer rig by-pass valve in reply to PCC-AL, 05-23-2002 04:15:24

I will use the rig mainly to spray weed killer (Roundup or something similar) around barns & pecan trees in fields to kill weeds, poison ivy, etc. No nearby neighbors and not concerned with drift. I will use a water hose with grip type nozzle as I ride around on the tractor spraying. I have used a friend's factory production rig before in exactly the same way. It worked great, but I can't just keep borrowing his sprayer.

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As usual, I didn't give enough info- PCC-AL

05-23-2002 11:00:11

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Re: Question about sprayer rig by-pass valve in reply to PCC-AL, 05-23-2002 04:15:24

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paul

05-23-2002 10:47:41

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Re: Question about sprayer rig by-pass valve in reply to PCC-AL, 05-23-2002 04:15:24

Hummm, most sprays are pretty expensive, over-applying & wasting product; underapplying & not getting the job done; or getting too much pressure & causing micro-dropplets (causes drifting, and serious liablity claims when the neighbor's crops /lawn die) could quickly get more expensive than a $60 valve. The pump might be the heart of a spray system, but that valve is the brains of it all, don't know that I would actually want to skimp on that one.

--->Paul

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thurlow

05-23-2002 07:35:58

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Re: Question about sprayer rig by-pass valve in reply to PCC-AL, 05-23-2002 04:15:24

PCC-AL; What are you gonna use this rig for??? If it's for production work, i.e. business, you may have to just bite the bullet. If you're just fooling around, i.e. hobby; anything to 'choke' the return line.....gate or globe valve...will work. You may experience a fluctation in pressure when you turn on boom(s), but shouldn't be anything you can't live with. What kind of pump are you using; might not want to do this with positive displacement pump; could bust hoses.

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Sorry about the multiple posts-computer problems. PCC-AL

05-23-2002 04:17:02

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Re: Question about sprayer rig by-pass valve in reply to PCC-AL, 05-23-2002 04:15:24

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