Gorton D valve

acl10

My Gorton D Valves make a hissing sound after the radiator fills with steam. Is that normal?

Alex265

From my (very small) experience

If they do it after the radiator is filled but while the boiler is still running - this may indicate that your system develops some noticeable pressure closer to the end of the 'on' cycle (boiler runs for a long time and pressuretrol does not trip when expected).



If they do it after the boiler shuts down - they are actually taking air in because steam is condensing, creating vacuum. It is normal, but hissing may again indicate that the pressure was somewhat high at the end of the cycle.

acl10

Runs when boiler is on

Runs when boiler is on and my pressuretol is set to the lowest

Steamhead

If the hiss is intermittent

after the rad has filled with steam, that's normal. These vents operate on temperature and may hiss if they cool down a bit.



If they hiss constantly after the rad is full of steam, the vent is either dirty or defective.

acl10

They all do

They all do. They cant all be defective. Is it because there is to much pressure? I have a pressure tol should it be chaged for a vaporstat

BobC

Pressure and air valves

is the pressuretrol set as low as it can go (0.5 on front and 1 on inside dial)?

Does your pressure gauge read anything (a 0-30 should be way down in the mud 1--1/2 PSI or so)? Adding an auxiliary 0-3PSI would let you know exactly what is going on.

If the pressure cut in is 3PSI or more the air valves cannot close, they need less than 3PSI or less to work.



Try taking a couple of vents off and boiling them in vinegar for half an hour, that should remove any calcium deposits. Keep the system off till you get them put back.

acl10

Pressure is set

Pressure is set at .05 and 1. Some are new. Its only the D valves that do this the c is quiter

Alex265

I think that

your pressuretrol needs to be adjusted - it does not shut down boiler at 1.5 PSI. This usually can be done easily, but a 0-3 PSI pressure gauge would be helpful. There have been several threads here discussing this.

acl10

How do you adjust the pressurtol

How do you adjust the pressurtol

Alex265

This thread may be of interest to you

http://www.heatinghelp.com/forum-thread/132580/Pressure#p1206604



Below is my posting from this thread. I also remember someone posted a picture of a simple test rig they created for testing pressuretrols, but I can't find it now. I think I would start with getting a 0-3 PSI gauge to see what is really going on in the system.



Most of these pressuretrols are off in the lower scale range, at least the 3 I have were all off. I did a 'live' adjustment (which I don't know if it can be recommended but it worked for me). With pressuretrol set to desired settings, I make the boiler run for a while so that pressure starts building up, and then I watch the pressure on the gauge and when it is close to the desired cut off, I start slowly turning the pressuretrol's adjusting screw (that adjusts cut-in) down until the pressuretrol trips. This always happened before the spring would go loose from the screw, which is also a possibility. Visually, during all this time the cut-in setting was on 0.5.

acl10

Adjust

Its set to the lowest already .05 and 1 how do you adjust it any lower? Please give specific instructions