Good afternoon all! I use an ammonia refrigeration system to cool wine at our small family winery. Recently, the HPL feed line to our suction accumulator/recirc tank has begun to hammer. Historically it hasn't, but shortly after replacing a leaky solenoid valve the hammer began. It will stop if I throttle the globe valve on either side of the solenoid valve almost shut, but then I'm unable to maintain sufficient liquid in the accumulator to keep the circ pump operating. This cycling of the circ pump and subsequent intermittent distribution of liquid to the wine tanks is keeping me from maintaining wine temps effectively. Local service guys want to tell me how my whole system was plumbed wrong all over the place but get real quiet when I ask why it hasn't been an issue for the previous 15 years. I've attached a drawing of the accumulator. The line in question is labeled 1" HPL. I'm hoping some of you might have some insight...

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