I sell irrigation and have encountered this problem from time to time. You may have a pressure reducer that is rated for a lower flow than you have, or you might just have amazingly high pressure.
Either way you should buy another reducer. If you need a higher flow, just replace the one you have now. If you have very high pressure, buy a reducer that reduces it a little less than the one that is installed, and install it before the existing one.
The third possiblity is removing the reducer altogether. Don't do this unless you have an idea what your pressure is. I have customers who don't buy them at all.
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