I had posted about a problem with my hot water base board banging(water hammer) when the zone shut off. the problem was the new honeywell zone valve that the oil company service put in.
after 3 house calls for the same problem their lead tech was sent and removed a spring on the valve that assists closing the valve. he said they have received many complaints of this and honeywell said they had changed this spring to a heavier spring. spring is not needed and now I can sleep. hope this helps others if needed and thanks to the people who replied