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67coupe390 05-27-2009 06:36 AM

LP Valve issues
 
I'm having valve issues and am wondering if I'm using the wrong valve. This HVACR > Controls > Gas Valves > Valve,Combination : Grainger Industrial Supply is what I am using. The problem is that the valve will not always shut off when the controller tells it to. When the controller ( A cal 9900 CAL 9900 Temperature Controller ) calls for heat a light will come on and when it is suppose to turn off the valve the light goes off. I hear the solnoid click on and off but the valve doesn't always turn the gas off. My setup is this I'm using a 20 psi regulator hooked up to a 20lbs ( ? ) propane tank. This is plumbed into a 1/2" black pipe manifold that feeds all three burners in my rig. The HLT and the boil burners have just ball valves. The mash tun burner has a ball valve and the combo valve. This problem happens even when just the mash tun burner is going Any ideas? Thanks. :confused:

kladue 05-27-2009 01:48 PM

The valve you have installed is only meant for 1/2 PSI maximum inlet pressure, if you are operating at 10-20 PSI the valve will probably not want to work at all. You have two choices, drill out the burner jets for low pressure operation and use low pressure regulator (11" wc) or replace existing valve with solenoid valve.

67coupe390 05-27-2009 01:55 PM

Quote:

Originally Posted by kladue (Post 1347271)
The valve you have installed is only meant for 1/2 PSI maximum inlet pressure, if you are operating at 10-20 PSI the valve will probably not want to work at all. You have two choices, drill out the burner jets for low pressure operation and use low pressure regulator (11" wc) or replace existing valve with solenoid valve.

What size would I drill out the burner jets to for low pressure? Then I could use this http://www.bayouclassicdepot.com/7850_propane_regulator.htm I thought I saw someone on the forum with a furnace style valve, can it be modified to work with 20 psi? This is the burners I'm using http://www.bayouclassicdepot.com/bg14_cast_iron_burner.htm

Sawdustguy 05-27-2009 02:06 PM

If you look at the specs on the Grainger web page you will find:

Pressure Setting Range (In. WC) 2.5 to 5.0

If you convert 2.5 to 5.0 Water Columb to Pounds/Square Inches it is 0.09 to 0.18 PSI. You were feeding a valve rated for 0.18 PSI with 20 PSI. Not very safe!!!

Use Online Conversion - Pressure Conversion to convert WC to PSI

Sawdustguy 05-27-2009 02:15 PM

Quote:

Originally Posted by 67coupe390 (Post 1347279)
What size would I drill out the burner jets to for low pressure? Then I could use this Propane Regulators, PSI Adjustable Propane Regulator I thought I saw someone on the forum with a furnace style valve, can it be modified to work with 20 psi? This is the burners I'm using Propane Cast Iron Burners, High Pressure Cast Iron Banjo Burner

That is not a low pressure regulator. You will never be able to set that regulator low enough for your valve to work properly if you have not damaged it already. You need a regulator that is rated at less than 5 WC.

67coupe390 05-27-2009 02:22 PM

Quote:

Originally Posted by Sawdustguy (Post 1347312)
If you look at the specs on the Grainger web page you will find:

Pressure Setting Range (In. WC) 2.5 to 5.0

If you convert 2.5 to 5.0 Water Columb to Pounds/Square Inches it is 0.09 to 0.18 PSI. You were feeding a valve rated for 0.18 PSI with 20 PSI. Not very safe!!!

Use Online Conversion - Pressure Conversion to convert WC to PSI

Thats a good conversion site. Thanks! For Lp on this valve its 7.5" to 12 " which would be almost 1/2 psi. Is there a way to modify the valve to close/work at 20 psi?

67coupe390 05-27-2009 02:24 PM

Quote:

Originally Posted by Sawdustguy (Post 1347328)
That is not a low pressure regulator. You will never be able to set that regulator low enough for your valve to work properly if you have not damaged it already.

It says it works from 0-30 psi. Why not?

Sawdustguy 05-27-2009 02:29 PM

You will have lots of difficulty setting a 0 to 30 PSI regulator for 0.18 PSI. How are you going to know when the regulator is set for 0.18?

Sawdustguy 05-27-2009 02:34 PM

Quote:

Originally Posted by 67coupe390 (Post 1347346)
It says it works from 0-30 psi. Why not?

You need something like this: http://www.belgas.net/belgas/pdfs/P912.pdf

67coupe390 05-27-2009 02:41 PM

Quote:

Originally Posted by Sawdustguy (Post 1347366)
You need something like this: http://www.belgas.net/belgas/pdfs/P912.pdf

If I use this with the valve I have the flame will be very small right? I may just need a different valve.


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