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PVC union with O-ring for sprinkler valve manifold

PVC union with O-ring for sprinkler valve manifold

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Old 05-04-20, 10:32 AM
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PVC union with O-ring for sprinkler valve manifold

I need to build a valve manifold and would like to use unions with O-ring for ease of replacement. What are your recommendations on glued joints vs O-ring unions? Thank you.
 
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Old 05-04-20, 11:35 AM
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I prefer simple glued joints. Cheap, simple and very reliable. Unions are great when they work but I've run into some that can be annoying to put back together without leaking and sometimes they can be difficult to unscrew.
 
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Old 05-04-20, 11:40 AM
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I like making manifolds a little longer or taller than necessary, This gives me room to cut and replace any bad parts that come up I always use glue joints
 
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Old 05-04-20, 01:59 PM
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Two moderators' advice is good enough for me. I will make the valve connections a little longer on one side for future cutting and sleeving. Thank you.
 
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Old 05-06-20, 11:58 PM
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I have another question. Is there a trick to keep a gear driven sprinkler head from spinning? I have a long and narrow strip that I would like to water without running an underground line to the strip. The minimum rotation angle of these sprinkler heads is about 40 degrees. I need zero degree of rotation. Maybe 10 degrees max. Thank you.
 
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Old 05-07-20, 05:30 AM
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For $10 I would just purchase the correct emitter for the pattern you need. They sell sprinkler emitters that do long rectangular patterns.
 
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Old 05-17-20, 09:53 PM
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Thank you for the strip spray suggestion. I have another question. Do poly pipes often come loose from barb insert without hose clamp in sprinkler systems?

FYI
3/4" pvc barb insert and 3/4" 125 psi poly pipe. City water pressure 50-60 psi. I cannot push the fitting into the pipe with hand. I will try hair dryer tomorrow.
 
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Old 05-17-20, 11:20 PM
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will try hair dryer tomorrow.
Use a butane torch, lighty fan around and across the end of the hose, warms them up nice so fittings slide on.

And it's quick and portable around the yard!
 
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Old 05-18-20, 01:02 AM
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Watch the heat on that torch, only have to fan a little.
 
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Old 05-18-20, 01:53 AM
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I am too scared to use a torch. Let me try a heat gun first. Going back to my other question, do I have to use a hose clamp on barb insert? I ordered wrong size hose clamps (too small).
 
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Old 06-02-20, 10:14 PM
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2 more questions

My sprinkler project is near completion. These probably will be my last 2 questions.

Q 1) Is vacuum breaker backflow preventer reliable? I need to leave the faucet open all the time except in winter. Will backflow preventer take constant water pressure (48 psi, measured at the hose bib)? Leaking a few drops is acceptable as far as it does not fail catastrophically, dumping hundreds of gallons while I am away.

Q 2) Connection between PVC pipe and hose bib? The best I could find on youtube is washer hose with stainless steel sheath. My configuration will be hose bib > Washer hose > 3/4" brass female pipe thread to male hose thread adapter > 3/4" PVC Schedule 80 male pipe thread - slip > 3/4" schedule 40 PVC pipe. Does this look decent? Thank you.

 
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Old 06-03-20, 06:37 PM
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Yes..... vacuum breakers are pretty reliable. Once they are charged they usually seal pretty well.
Your idea with the hose will work but washer hoses are nowhere near 3/4".
Most are 1/2" and even smaller...... especially using the braided ones.
 
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Old 06-04-20, 11:58 AM
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Thank you for the advice. After reading your advice, I searched internet and found large diameter washer hose for higher flow rate. They ARE expensive. I have a small lot divided into 4 zones. If flow rate becomes a problem, I will know why. If you know better ways to connect pvc irrigation pipe to a hose bib, please let me know.

I have one more question. A soaker hose needs to cross a narrow walkway . If I paint a section of the hose with multiple layers of exterior latex paint, will hose pores be plugged? Any advice? Thank you.
 
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Old 06-04-20, 12:01 PM
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I would cut the soaker hose and splice in a section of regular hose wherever you don't want it weeping.
 
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Old 06-04-20, 12:29 PM
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Look here I found several different hoses and bib hose repair kits to make your own
https://www.lowes.com/search?searchT...4+hose+splicer
 
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Old 06-05-20, 11:16 AM
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Double post. Please delete.
 
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Old 06-05-20, 11:23 AM
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Thank you pugsl for the link. I like the corrugated stainless steel water heater hose with pipe threads best for 200 psi rating, large internal diameter, sun and weather resistance, and price.

I will mix regular and soaker hoses for walkway crosses. Thank you.

 
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