Honeywell zone valve

simba

Is there a harm to unhook the out spring of Honeywell zone valve in order to eliminate water hammer in one zone.
Thankyou

Derheatmeister

It would most likely result in a uncontrollable zone associated with it..
Most of the times a waterhammer is due to:
1. Pumping against the Zone valves intended Flow direction.
2. A loose pipe.
3. Overpumping.
Some Zonevalves such as the Taco 571 or Caleffi 676 series are slow opening valves which may help with this situation..

HVACNUT

It's the spring that makes it close. It only gets power to open. 
There are other valves out there that close slower.

simba

Thanks for the quick reply. So i unhooked one of the outer spring and now i can see the valve closes a bid slower and the noise went sway. Can i leave it like this for now and take care of it in the spring. Does this harm my boiler. Thank you

HomerJSmith

Yes & no.

Derheatmeister

simba said:

Thanks for the quick reply. So i unhooked one of the outer spring and now i can see the valve closes a bid slower and the noise went sway. Can i leave it like this for now and take care of it in the spring. Does this harm my boiler. Thank you

It is probably piped in reverse direction..

hot_rod

The springs determine the close off pressure of the zone valve. If it is an 8 Cv valve, the most common, it has a 20 paid shutoff. Disconnecting one spring reduces that close off, so depending on the circulator delta P, the valve may not close tightly. Swapping one problem for another. Check the temperature a few feet away from that zv, if its hot, the valve is leaking past

over pumping is the most common cause of hammer. A delta P circulator is ideal for multi zoned systems, as it adjusts flow according to the valves open.  And saves 50% or more on electricity 

DanHolohan

Removing one of the springs is a widely used trick in the field. It usually gets rid of the hammer on closing. 

Tim McElwain

Dan is correct I have been doing it for years and no harm done. I have been directly or indirectly involved with this industry since I was sixteen and now I am 82. If there had been a problem with me doing it I would have heard about it by now.

hot_rod

Wonder why they still put two springs on? To bad the HW engineers don’t hang here😗

nathandclements

What exactly IS water hammer, and what is happening to cause it when the valve closes? I have a terrible banging sounds I'm trying to solve. If happens almost every time the system cycles. I thought it happened on valve open, but now I'm wondering if it's actually happening on valve close. I have noticed that if I leave the thermostat cranked all the time, it doesn't do it as bad or as much.

Here's a link to my post about it: https://forum.heatinghelp.com/discussion/187411/obnoxious-banging-constant-bleeding-info-overload#latest

DanHolohan

Here's an old story about all of this:
https://heatinghelp.com/systems-help-center/banging-zone-valves/