Zone Valve Bang

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Old 11-24-08, 01:33 PM
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Zone Valve Bang

One of my zone valves makes a loud bang, shakes the pipes, when it closes. (Oil/hot water furnace) What can case this?
 
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Old 11-24-08, 04:30 PM
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Check to see if the expansion tank is full of air.
Doug
 
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Old 11-24-08, 04:57 PM
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Closing too fast ... If they're Honeywell valves, I believe you can remove one of the springs ... not sure which one though ...

When two valves are open, and the circulator is running, if one of the valves closes, while the pump is still running, you can get a hammer like that ...

If only one valve is open, the circ would usually be stopped or way slowed down by the time the valve closed thus, no hammer.

re: Doug's suggestion: what is the pressure reading from cold boiler to hot boiler ? How many PSI ?
 
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Old 11-25-08, 08:14 AM
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Originally Posted by gilmorrie View Post
Check to see if the expansion tank is full of air.
Doug
Should I release air from the tank?
 
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Old 11-25-08, 04:21 PM
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No... don't do that ! you might need to put air in if anything ...

I think what Doug meant to say was 'check that the tank has the proper air charge' .

Do not mess with the tank yet ...

DO tell us what the pressure gauge reads on a cold boiler, vs what it reads on a hot boiler ...
 
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Old 11-30-08, 09:44 AM
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Check and make sure that the zone valve was installed in the correct flow direction.
 
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Old 11-30-08, 12:19 PM
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Originally Posted by NJ Trooper View Post
No... don't do that ! you might need to put air in if anything ...

I think what Doug meant to say was 'check that the tank has the proper air charge' .

Do not mess with the tank yet ...

DO tell us what the pressure gauge reads on a cold boiler, vs what it reads on a hot boiler ...


The boiler kicks in at 160 and off at 180.
 
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Old 11-30-08, 03:45 PM
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Check and make sure that the zone valve was installed in the correct flow direction.
Good point!

The boiler kicks in at 160 and off at 180.
That's a temperature ... when the boiler kicks off at 180, what does the PRESSURE read ?

When the boiler is stone cold, what does the PRESSURE read ?

This will tell you if there's a possible problem with the expansion tank.
 
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Old 12-11-08, 02:48 PM
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The pressure seems to stay between 16-20 at all times.

Originally Posted by NJ Trooper View Post
Good point!



That's a temperature ... when the boiler kicks off at 180, what does the PRESSURE read ?

When the boiler is stone cold, what does the PRESSURE read ?

This will tell you if there's a possible problem with the expansion tank.
 
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Old 12-11-08, 07:37 PM
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The pressure seems to stay between 16-20 at all times.
Good ...

Did you check that the valve is installed in the correct direction?
 
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Old 12-12-08, 08:15 AM
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No problems with the valves, their all the same direction. Just a loud bang when one of them goes off. I've stood there and waited but of course it doesn't happen when your watching.

Can you tell me what the psi should be for the expansion tank?

Thanks for all your help


Originally Posted by NJ Trooper View Post
Good ...

Did you check that the valve is installed in the correct direction?
 
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Old 12-12-08, 08:37 AM
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I checked the pressure on the expansion tank and it's at 14 psi. It's an Amtrol and it says 12psi. on the label. My incoming pressure reading from the well reads 28 psi.

Should I release 2 lbs. from the expansion tank?
 
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Old 12-12-08, 09:07 AM
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Where are the zone valves, supply or return side?
Where is the pump, supply or return side?
Where is the Exp tank, supply or return side?

You said all valves are in the same direction, but is the piping and flow in the correct direction?

Many many years ago when H/W designed their valves they intended them to be on the return, thus the inlet is on the wiring end. In this direction the valve ball closes against flow. If installed in reverse, the motor fights flow, and flow along with springs closes them thus the bang if installed backwards. Backwards installs often tend to lead to premature valve, ball and motor failures.
 
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Old 12-12-08, 11:23 AM
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This is the order coming from the top of the boiler (which I assume is the supply side) pump, expansion tank then to a manifold where the valves supply each zone. The return comes back into the lower section of the boiler.

I never had this banging before so this mystifies me. All the valves are the same and in the same direction.
 
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Old 12-12-08, 11:53 AM
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boiler banging

Originally Posted by luckj View Post
One of my zone valves makes a loud bang, shakes the pipes, when it closes. (Oil/hot water furnace) What can case this?
check to see if your circuler pump is not on backwards see if the arrow is pointing down to the floor then it be right [ ben ]..........
 
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Old 12-12-08, 06:34 PM
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I've stood there and waited but of course it doesn't happen when your watching.
No, of course not...

Try this: Push TWO thermostats up to call for heat. Your banging zone, and any other. Leaving the any other calling, turn the banging one down so the valve closes. Does it bang then?

When you checked the pressure on the expansion tank, did you drop the boiler pressure to zero by opening a drain and letting some water out? You won't get an accurate or even realistic reading if you don't do that.
 
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Old 12-13-08, 03:51 PM
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"All the valves are the same and in the same direction."

We understand that, but have we determined yet if the valves are installed with flow in the correct direction yet?

What brand are they?
 
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Old 12-17-08, 08:48 AM
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Originally Posted by ZL700 View Post
"All the valves are the same and in the same direction."

We understand that, but have we determined yet if the valves are installed with flow in the correct direction yet?

What brand are they?
Honeywell, the arrows on the valves point in the direction of the flow.
 
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Old 12-17-08, 05:45 PM
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Have you tried the 'experiment' from my earlier post?

Since you say that it doesn't do it all the time, it might help to know what conditions exist that DO cause the hammer.
 
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Old 12-19-08, 12:46 PM
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Originally Posted by NJ Trooper View Post
Have you tried the 'experiment' from my earlier post?

Since you say that it doesn't do it all the time, it might help to know what conditions exist that DO cause the hammer.
Not, yet. I'll try it today or tomorrow. Thanks for your help on this.
 
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