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Old February 11th, 2019, 09:21 AM   #1
BrockSamson
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Convert old 24AC pnematic solenoid valve to new 24DC solenoid valve with rectifier?

I have an old piece of machinery that has a 24VAC pneumatic solenoid valve (5 port, 4 way, single with spring return and 1/2 inch inlets and outlets). I am in a hurry to get a replacement and cannot find a manufacturer that keeps them in stock.

Could I use a rectifier or converter to change the power from 24VAC to 24VDC so I can just buy a 24VDC pneumatic solenoid valve replacement?

I am new to this stuff this might be a stupid question.
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Old February 11th, 2019, 09:44 AM   #2
T Gibbs
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Have you looked at Automation Direct for a valve?
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Old February 11th, 2019, 09:53 AM   #3
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https://www.automationdirect.com/adc...TC%20Tubing%22

Looks like Automation Direct has this in stock.

Yes, you could use a 24VAC coil of a relay and drive the new 24DC solenoid with the contacts of the relay with a 24VDC supply.

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Old February 11th, 2019, 09:56 AM   #4
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Yes, it should work.
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Old February 11th, 2019, 10:32 AM   #5
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A full wave rectifier will turn the 24VAC into a "rippled" DC voltage. The RMS will be 24V, but the peak will be over 35V.
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Old February 11th, 2019, 11:41 AM   #6
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I guess that is my only option. Thank you.
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Old February 11th, 2019, 01:08 PM   #7
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The one they sell on automationdirect is 1/4 and I need 1/2
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Old February 11th, 2019, 01:41 PM   #8
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This would fit the bill at 24 VDC:
https://www.automationdirect.com/adc...)/avs-5414-24d
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Old February 11th, 2019, 01:44 PM   #9
BrockSamson
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Thanks CLEM. I have seen that one but the problem was finding one in VDC so I guess the only option would be using a relay to drive an addition 24VDC power supply to power that particular one.
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Old February 11th, 2019, 03:19 PM   #10
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interface relay will make sure you don't fry anything in case the new valve need more power than the old one...Take a look in the controls, maybe it is already a relay that drive it ?
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