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sprinkler valve power supply. need advice

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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sprinkler valve power supply. need advice

Unread postAuthor: Crash Kayak » Sat May 11, 2013 5:30 pm

Hello from the new guy.
What voltage and amperage do I need to run 4 lawn sprinkler valves at the same time? I want to have a switch for each one , but be able to run or all4 at the same time. Can this be done with a regular power supply, without any other circuitry than switches?

Thanks in advance, Crash Kayak
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Unread postAuthor: Technician1002 » Sat May 11, 2013 7:13 pm

Sprinkler valves run on 24 Volts AC. They will run on 18 Volts DC for momentary use.

Actual current needs are in this thread.

http://www.spudfiles.com/forums/questions-electric-sprinkler-valve-t18083.html

Most valve sizes use the same coil from 1/2 inch to 1-1/2 inch.

Most irrigation transformers will run one or two valves at the same time. To run all 4 use a larger 24 volt control transformer such as is used in a heat pump.

http://www.dultmeier.com/products/0.269.284/3133
http://www.grainger.com/Grainger/transformers/transformers/electrical/ecatalog/N-8hn

The simple answer. Each draws 0.25 Amps at 24 Volts for 6Volt Amps each (VA). A 20 VA transformer will run up to 4 at the same time.
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Unread postAuthor: jimmy101 » Sun May 12, 2013 2:30 pm

Or, a pair of smallish lead acid batteries (perhaps gel batteries) in series will provide tens of amps at 24VDC. More than enough to operate the valves.

If you have 4 valves the gun is probably pretty big and might be carriage mounted, plenty of room for largish batteries.

http://www.allelectronics.com/make-a-st ... ERY/1.html
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Unread postAuthor: Crash Kayak » Mon May 13, 2013 12:37 pm

jimmy 101,didn't mean to mislead but I am not making a spud gun, I just want to run 4 sprinkler valves at the same time in parallel .
output 26V. 750 MA plug in class 2

Technician1002
I'm getting confused when putting the coils in parallel how does that affect the induction. How large a transformer 26 volt output will I need?

Thanks Guys, Crash Kayak
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Unread postAuthor: dewey-1 » Mon May 13, 2013 1:00 pm

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Unread postAuthor: Technician1002 » Mon May 13, 2013 7:30 pm

Crash Kayak wrote:I just want to run 4 sprinkler valves at the same time in parallel .
output 26V. 750 MA plug in class 2


Each valve is 0.25 amps. The 750 mA transformer is 0.75 Amps, so it will run up to 3 valves. 24 VAC is recommended. 26 is close but may have heating problems if your application is high duty cycle.

A 1 Amp or 20VA transformer is the minimum size you can use. Larger is OK like the 50VA example above.
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Unread postAuthor: jackssmirkingrevenge » Mon May 13, 2013 11:39 pm

Crash Kayak wrote:jimmy 101,didn't mean to mislead but I am not making a spud gun, I just want to run 4 sprinkler valves at the same time in parallel


I love how this forum is considered to be an authority on the subject :D
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Unread postAuthor: Crash Kayak » Wed May 15, 2013 1:27 pm

Thanks Guys
Checked all my power supplys and non would fill the bill , so I ordered the one from dewey 1 suggested. I think my pump will handle all 4 sections and that should save me some money.

Crash Kayak
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