+1 on the gate valve. With a gate valve on there it won't matter if you go straight in because you'll be able to manually adjust the flow anyway. If I can make one suggestion from my own experience, save your self a lot of grief and don't try the ball valve, go with a gate valve. If you can't find one in Calgary, J&L has them. Some people get lucky and can balance their herbie with a ball valve but it would seem they are far in the minority and I personally would chalk it down to pure luck. I fiddled with mine unsuccessfully for over a month, switched to a gate valve and had it within a couple hours.
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