Zone Valve Issues On New Boiler

Rizz861

So this particular boiler has 3 zone valves (caleffi) and a Taco 007 F5 pump. The HO is experiencing water hammer only when zone two is closing. There were no CV I could see and the ZV and pump are the right direction. ZV are on supply. Any ideas?

hot_rod

Is the pump being controlled by the end switch? The pump should stop spinning when the zone valve starts to close. Tubing that is not secured tightly can cause some noise also when a valve closes.
Where are you located?

Big Ed_4

The zone valve should be piped on the opposite end from the circulator location ...

kcopp

Installing a Delta P pump would help. Grundfos 15-55 or the like.

Joe Mattiello

Are you still experiencing hammer? Which valve do you have?
contact Taco  at 401-942-8000 and ask for tech support. 

HomerJSmith

What is water hammer? Is it the momentum of a flow of water crashing against a stop? hmmm
What is that telling you? Maybe the flow in that particular zone is excessive? Maybe the zone valve is closing too fast? Honeywell ZVs have two return springs in which case I have removed one spring with success in reducing water hammer allowing the valve to close slower. Caleffi may only have one spring, I don't know.
I always use balancing valves not only to balance flows thru the system but to regulate the flow thru a given circuit. I have also put a washing machine water hammer air arrester on the offending zone's hose bibb with success.

HomerJSmith

@Big Ed_4

The zone valve should be piped on the opposite end from the circulator location

Why is that? Inquiring minds want to know. In an open sys flow has a relationship to pressure. The more pressure the greater the flow. In a closed sys the flow is the same in every part of the circuit. That's what I thought, but I may be wrong on that. I am interested in what you think.

Jamie Hall

HomerJSmith said:

@Big Ed_4

The zone valve should be piped on the opposite end from the circulator location

Why is that? Inquiring minds want to know. In an open sys flow has a relationship to pressure. The more pressure the greater the flow. In a closed sys the flow is the same in every part of the circuit. That's what I thought, but I may be wrong on that. I am interested in what you think.

Almost. The ringer in the deck is that if a pump stops quickly enough it generates a negative pressure -- not flow -- wave in the pipe, and that can be a source of hammer. If a valve closes quickly against flow, it will create a positive pressure wave, and that can hammer. I don't think it really makes a whole lot of difference, though, whether the pump and the zone valve are close together or not...

Big Ed_4

With a spring loaded zone valve , it is best to add resistance between the valve and pump . A buffer , Helps to prevent this type of call ..

hot_rod

It is the flow and the speed or velocity of the fluid that the valve is closing against. It should not matter if the valve is on supply or return. A 007 should not be causing an issue with any spring return zone valve.