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The shaking may be due to the reducing valve being undersized. For instance a ½” valve would allow for 187 lbs. per hour. The ¾” would allow for 225 lbs. per hour. And the 1” would allow for 353 lbs. per hour. If the valve is too small and there is a large steam flow coming through the valve, the steam gets “crunched” and agitates the valve. Make sure the valve is tightened down, and that the valve is the proper size.