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Yes, I agree w/ BigInch on the drawback of placing the check valve next to the elbow. If space was tight, what would be a min. spacing from elbow...eg. 1D, 2D, 3D? I guess the right answer is the max. the space allows. Some instr. require 5D straight length. Offtopic, pennpiper is correct...on...

Thanks. Good points.

2 Questions 1) Can NPS 12 class 150 BW swing check or gate valve be welded directly to a BW 90 deg. LR elbow? 2) Can NPS 12 class 150 BW swing check or gate valve be welded to each other?

Thanks much. That sounds reasonable. I'll buy that.

Anyone know what a flatolet is and what it looks like? A major refinery (client of ours) has just recently add this fitting to one of their pipe specs. I know what a sockolet, threadlolet, & a weldolet is, but, never heard of flatolet.