Apart from when first shifting over, for the rest of the time, the DC is far more efficient, dose not overheat and possibility of burning the coil out if does not shift completely for some reason, or someone forces the armature over manually!
In servicing many machines of all stripes, I do not recall ever changing the coil of a DC Contactor/valve etc as a result of overheat.

 

Out of.the last 2400 Ive installed none have been replaced for over heating its only been mechanical
I have seen DC Contactors that coil burnt out but there really no way to tell but it looks like the contacts where the most heat started
some just a simple as lose wire My guess most are not coil related

I use DC 24 volt for all the motors and 24 AC for all valves

But for this the person is turning off gas if fan doesn't run

hold open lp gas and stop it if fan loses power

Gas fan so you have some kind of heater ?
Heater do you light it yourself ?
Probably has gas valve ?
Gas valve probably has high limit switch

Maybe no one here seen a fan limit switch gas off if to hot gas off if fan isn't running gas on fan delay till heater gets warmed up

But for the OP no gas if no fan and the best part no worry of a cheap valve giving out cause it got to hot and melted the rubber parts inside it.

 

Hi everyone,
here is the solenoid,I chose this one because it said continuous duty. The use of it is to hold open lp gas and stop it if fan loses power. I could use a 12v dc since my system uses dc also.

That solenoid wont hold at 57 volts, 97 is the minimum from the manufacturer.are you sending a/c volts to it?

 

Out of.the last 2400 Ive installed none have been replaced for over heating its only been mechanical
I have seen DC Contactors that coil burnt out but there really no way to tell but it looks like the contacts where the most heat started
some just a simple as lose wire My guess most are not coil related

I use DC 24 volt for all the motors and 24 AC for all valves

But for this the person is turning off gas if fan doesn't run

Gas fan so you have some kind of heater ?
Heater do you light it yourself ?
Probably has gas valve ?
Gas valve probably has high limit switch

Maybe no one here seen a fan limit switch gas off if to hot gas off if fan isn't running gas on fan delay till heater gets warmed up

But for the OP no gas if no fan and the best part no worry of a cheap valve giving out cause it got to hot and melted the rubber parts inside it.

You said that you’re using this so that if the fan doesn’t run, do you mean doesn’t have power to the fan because what happens if the motor on the fan goes bad and it doesn’t run is the valve still going to stay open?

 

I have not replaced the solenoids, but I have had to replace those big 24 volt DC power supplies. Yhe non-regulated high power ones with the black anodized frames. That was a system that I had no part of designing and no part of telling them how to build it. So I am not at all convinced that DC solenoid valves are better than GOOD 120 volt AC solenoid valves. I make no assertions that any cheap junk valves of any brand are OK.

 

If there’s no power gas valve is off if no fan running gas valve is off they been building heaters for a long time key parts are your limits and gas valve

 

So I am not at all convinced that DC solenoid valves are better than GOOD 120 volt AC solenoid valves. I make no assertions that any cheap junk valves of any brand are OK.

I have designed and maintained equipment for some of the larger Can production Companies and just about all were keeping a large stock of AC solenoid coils for maintenance purposes.
The ones that either I convinced to go to DC versions or were already fitted to European imported M/C's, never suffered any failure due to coil loss.
When I came to N.A., I was surprised at the widespread use of AC devices such as these fitted to production equipment.

 

The reason for using the 24 volt DC valves is mostly to prevent careless folks from electrocuting themselves. I know that at least one of those countries demand clear plastic in front of all the wiring inside the interlocked electrical enclosures. So if the users are that incredibly careless then a safe voltage is a last resort.

 

It is a great deal easier now that Machine tools & systems Manuf. are using the preferred 24CDC for control purposes. Indicator signage and lighting, etc, so the source voltage is imbedded
Coil life & efficiency is one of the main reasons I tend to use this voltage.