Why isn’t there a #3 or #2 rate vent?

mikeg2015

In the MoM and Gorton lines, why isn’t there an ultra slow vent like a #3 or #2? Is a smaller orifice just too likely to plug? Does it whistle when wet? I could really use a vent just a tad slower for several smaller radiators. My solution is to place them on TRV’s.

Perhaps I’m looking at it the wrong way. IF I further increase main venting, I can maintain the same venting ratio on the fastest vents, while have a larger ratio with the slowest vents on small radiators. IT would shift the baseline.

Might be time to do some more drilling and tapping or install a Tee on the dry return drip to add all the venting I want. I know it’s not the preferred location. But my main is so large compared to the boiler size steam volume and velocity at that point I don’t think it will matter at all.

Only vent slower than a #4 is a obsolete Hoffman 2 vacuum vent. But you can’t get those in a vertical configuration for a TRV.


Any thoughts?

KC_Jones

Hoffman 1A
I ignored the official numbers and got it even slower. I had a #4 on the subject radiator and it was too much, I had the Hoffman laying around so I tried it. Works like a charm. I have 40 EDR for a single 180 sq ft bedroom and it needs “tamed”.

ChrisJ

I've wondered what happened to #3 and #4 also.

For that matter where's 7,8,9? There's C and D but why did they go to letters?

Precaud

ChrisJ said:

For that matter where's 7,8,9? There's C and D but why did they go to letters?

They were visionaries. It's a hexadecimal system

Steamhead

Maybe someone at Gorton would know. But I would assume numbers 1 and 2 were already in use for their main vents. They might have left 3 open for an even larger main vent- I once suggested they scale up the #2 to create a #3, but they didn't.

SteamingatMohawk

The Vent Rite #1 is adjustable from "OFF" at setting 1 to a #5 at setting according to the table in the Data from Gill/Pajek report, "Balancing Steam Systems, Using a Vent Capacity Chart", 2005, which you can Google to see.

SteamingatMohawk

Similarly, the Heat Timer Varivalve is a #5 at Minimum setting and between a #1 and #2 fully open. Again see the report.

Hap_Hazzard

They're just model numbers, not sizes. #1 and D are the same size, but they have different fittings.

I don't see much need for a vent slower than a #4, but there's quite a gap between a #6 and a C.

mikeg2015

> @SteamingatMohawk said:
> The Vent Rite #1 is adjustable from "OFF" at setting 1 to a #5 at setting according to the table in the Data from Gill/Pajek report, "Balancing Steam Systems, Using a Vent Capacity Chart", 2005, which you can Google to see.

In practice on a vapor system under 1oz. It’s a little wonky under a 4 setting. 1-3 are about the same... which you can see in the report. It’s about a 4 equal on setting 3 low and 5 on setting 7. 8 is about the same and if you go past 8 at all it goes to 0.

They don’t make a straight ventrite.

Otherwise I really like the vent rites.

mikeg2015

> @KC_Jones said:
> Hoffman 1A
> I ignored the official numbers and got it even slower. I had a #4 on the subject radiator and it was too much, I had the Hoffman laying around so I tried it. Works like a charm. I have 40 EDR for a single 180 sq ft bedroom and it needs “tamed”.

Got a couple of those laying around. Might try that. But again no straight 1a

ethicalpaul

Precaud said:

ChrisJ said:

For that matter where's 7,8,9? There's C and D but why did they go to letters?

They were visionaries. It's a hexadecimal system

$deadbeef

ChrisJ

ethicalpaul said:

Precaud said:

ChrisJ said:

For that matter where's 7,8,9? There's C and D but why did they go to letters?

They were visionaries. It's a hexadecimal system

$deadbeef

10 PRINT "3735928559"
20 GOTO 10

Hap_Hazzard

ChrisJ said:

10 PRINT "3735928559"
20 GOTO 10

$ echo "obase=16; 3735928559" | bc

Old unix geeks never die; they just > /dev/null