Noisy saddle valve

[drswil]

Hi, I replaced a saddle valve for my furnace water supply because it would not shut off when I wanted to close it. The new one works well however, when the furnace fires up and requests some water for the air filter, it is very noisy. If I turn the valve off the noise totally stops. The valve appears exactly the same as the previous one. Would anyone have suggestions to stop this noise? Thanks very much!