Solenoid water valve arduino

Other Hardware General Electronics
1

I have 12v 1/2 inch solenoid water valve connected with a relay to arduino.

All working fine when i try without connecting water pipes to the valve but valve doesn't open when water pipeline is connected

I tried providing 12v directly to the terminal but same issue, it works when there is no water pipes are connected,

i tried blowing air with my mouth and its normally closed and as soon i give 12v to terminal it opens and let me blow through but when i do same with water it doesn’t open.

I tried reducing and increasing water pressure too but no help.

I am giving 12v 5a power supply to valve.

Any help?

2

There are solenoid valves and then there are other solenoid valves. Until you provide the specifications on the exact valve you are using, no help can be given. Is your valve designed for liquids? Does it require certain pressure to operate? Does the valve require the water pressure on one specific side, like a piloted valve?

3

image

This one..

Designed for water/liquids
12v
Inlet and outlet are mentioned
Pressure not mentioned anywhere

Let me know what else needed..

4

Did you try it by switching polarity of the 12 volt connection? Try it with 12 volts from a car battery.

5

The coil label says it needs 12VAC not DC.

6

Well, I see DC 12V 50 / 60 Hz, so......?

7

Hi,
Can you measure the resistance of valve coil.

Thanks.. Tom... :smiley: :+1: :coffee: :australia:

8

Did the OP change pictures? I only see 12VDC.

9

But, after that there's '50/60 Hz'

10

Yes, that is really there, I did not look any further than the 12 VDC. Must be Chinglish description!

11

No, look at the 50/60Hz after the voltage. I'm of the feeling the DC is an easier mistake to make than adding the frequency numbers.

12

Knowing the coil resistance would clear the mystery but,,,,,,

13

Are you sure you have pressure connected to the "inlet" and not the "outlet"?

14

What pressure. Valves like that need a minimum water pressure to operate. That could be 20 PSI. The solenoid works in two stages. The solenoid opens a tiny hole in a membrane. The membrane then opens the valve. So direction is important.
Leo..

15

Guys its 12v dc and working fine when water pipes are not used.. i confimed with seller also..

Resistance value is around 30.5 under 2000ohm
Its keep it on varying but this one is most stable..

I am using correct inlet as its mentioned and has filter also.. moreover if i use outlet as inlet it doesn’t close water.. water keep on flowing in both stage (terminal high or low)

16

Hi,

What does that mean.
When you connect your DMM in resistance mode to the coil terminals, what does the display read.
Can you please post an image of your DMM measuring the valve resistance.

Do you mean you read 30.5 Ohms on the DMMs 2000 Ohms range?

When you connect the 12V to the valve, what voltage does your DMM measure across the coil terminals?

What is your water source?
Do you know what its pressure is?

Thanks.. Tom.. :smiley: :+1: :coffee: :coffee: :australia:

17

That perfectly describes a "piloted" valve! I have several on my irrigation system. They ALL work that way. Someone, probably the seller does not know anything about solenoid valves.

18

Then what might be the reason that mine doesn’t open when water pipes are attached?

19

If you had the documentation on the valve it would tell you the pressure difference needed to make the valve operate. My valves require at least 2 psi to operate. The screen on in the input of your valve is to keep the tiny piloting circuit free of debris. I have had my valves over 15 years and have had to clean them several times.

20

It say on the valve 0.02 to 0.8 MPa, so 3 to 155 PSI