Manual Radiator Valves Good supplier For ONE PIPE SYSTEM

Dave52

Looking for a good source for large port angle radiator valves.

I saw Sterlco had an on/off quarter turn, they claim for one pipe system. But nothing on CV for valve.

Jamie Hall

Grainger… State Supply…

Make sure they are for steam, not hot water. And CV is quite irrelevant on steam systems.

Neild5

I use Marsh R100A valves, mainly because they are heavy duty, but also have the same centerline dimension as the original valves installed in 1927.

delcrossv

Best? Mepco packless.

Dave52

The idea of asking about a proper valve is because the CV (orifice size) is generally not given on radiator valves. That's one way I can tell how big the opening is so that the condensate will pass out. A lot of the available valves today, the orifice (CV) is not big enough for this to function without problems.

If you look inside at the port size (orifice, CV) of the old one pipe valves they are darn near full port and the bottom of the seat has very little rise on it to allow the condensate to flow out along the bottom.

Jamie Hall

Quite correct on porting for one pipe steam valves. They must be full port — and many valves are not. The ones made for steam have a number of other odd characteristics as well — such as the outlet side not being threaded or sweat, but provided with a union and a mating spud.

In fact, you can't use just any old valve on a steam system elsewhere in the system, either. Any valve — zone valve, shutoff, whatever — has to be full port. And this is true whether you are looking at one pipe or two pipe. The reason has to do with the way saturated steam (which is what we are playing with) behaves when you run it through a contraction. Same thing is true of most refrigerants (and yes, steam is acting as a refrigerant, just at a low pressure and high temperature).

Dave52

delcrossv I just looked at Mepco. The packless appear to be smaller ported. The 600A valve is a dead ringer. It gives a good internal cross section, large port and good drainage. Unfortunately it doesn't look like it's available in under 2".