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Discussion Starter · #1 ·
Ok, looking to upgrade my solenoid.. Current one will work and last, for awhile, BUT it hums.. which I don't want. In it's defense it doesn't always hum..
anyways main criteria is quiet..I don't mind clicking on, just no power noise..

Clippard is out for now, only because I don't want to mess w/ a bunch of adapters..

I suspect it is a bit difficult to make a blanket statement on this considering models,ages ect..

So quietest, low W and 1/4npt....... simple............ ;)
 

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It shouldn't hum. I had a Burkert that humed. Turned out there was a small leak on the body.

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Discussion Starter · #4 ·
It shouldn't hum. I had a Burkert that humed. Turned out there was a small leak on the body.

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Thanks.. well being "its only money" I bought a Burkert , used w/ 1/4npt fittings but the dreaded high W's.. 8....
I do see you can get 2w replacement coils.. (derating the pressure) but not a priority.
24v
0211-A-1/8-FPM-SS
 

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if it is AC input, once the coil loose inside, it will "hum".

get the low voltage, DC input solenoid, never hum.

SMC VDW31-5G-2-02N, you should know where to find them, good luck.

This is one way to help avoid hum. A bit of background on why things like this might hum can help.
The electromagnets that pull the solenoid are wires wrapped around a metal framework. This frame is often made out of stamped metal plates help together with shellac or that sort of thing. Sometimes the metal plates have a bit of slack where they don't fit together perfectly. With DC power any loose plates click to one side and stay. But with 60 cycle AC the plates can wind up clicking back and forth in tune to the 60 cycle. AKA 60 cycle hum!
Stand in front of a gas fired furnace and you are likely to hear the hum from the solenoid.
 

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Discussion Starter · #7 ·
70 :) - SMC VDW31-6F-4-02N-J Pneumatic Solenoid Valve 4mm-Orifice 12VDC
only $237.......... :)
 

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Discussion Starter · #9 · (Edited)
Not that one, its MOPD is way off.
The only difference is the port size. 2 vs 4 mm, 24 vs 12V, and the wiring tabs..and mine are stainless steel..

I'm not seeing an issue..

Maybe I need to know what a "MOPED" is.. ;)


http://www.smcpneumatics.com/pdfs/VDW.pdf

well 29psi "at rest" vs 118.. I'd bet they would work just fine.. ;)... Personally I wouldn't doubt if the "outlet" was under a bit of vacuum.. increasing the diff to 30..;)

Always something.....
Maximum Operating Pressure Differential (M.O.P.D.) The maximum operating pressure differential refers to the maximum difference in pressure between the inlet and the outlet, against which the solenoid can safely operate the valve. If the pressure at the valve OUTLET is not known, it is safest to regard SUPPLY pressure as the M.O.P.D.
 

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I have a Burkert that used to hum and no longer does. It was the AC model as Bettatail mentioned.

If you want total silence then a Clippard Mouse solenoid is the way to go.
 
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