I have steam in the house and baseboard in the basement that runs from my steam boiler. The pump is on the supply side. I am getting water hammer in the return line of the baseboard when it is on at the same time the steam is on. I put a check valve on the line Everflow 210T034-NL 3/4-Inch Lead Free Brass Swing Check Valve with Female NPT Threaded, 200 PSI WOG & 125 PSI SWP Brass Construction Higher Corrosion Resistance Economical Durable & Easy to Install and it got a little better but it still has water hammer. Should I change it to a ball type check valve like Smith-Cooper International CV30 Series Brass Check Valve, 1/2" NPT Female, Non-Potable Water Use Only? Should I put another vent on the line after the check valve near the boiler?