The gas valve is installed to the treads of the compression nut after it the nut is installed into the flange.
How to install a gas pipe floor flange.
No turning drilling or machining whatsoever is needed.
In my limited experience i ve only seen these flanges used for non plumbing purposes by guys who build shelves furniture with black pipe.
Takes me about one mintute to prep and weld in my shop.
Otherwise i like min 1 in above flange to top of nipple for gas valve space.
Female pipe thread to 1 2 in.
Coat all threaded pipe connections with pipe thread compound before assembly.
Threaded pipe flange is supplied with a tapered internal thread that the pipe screws into.
Step 1 cut and thread the pipe.
If you know exact elevation you can customize the nipple length accordingly.
Use a 90 degree elbow at the stove to avoid kinking the gas tubing when you push the stove against the wall.
Female gas pipe threads on both sides.
Threaded flange find applications in areas in which hot work welding burning and grinding is undesirable.
The yellow pipe you attached to the flange can then be attached to a black pipe fifing with the proper fittings.
You do not need a floor flange and a floor flange is not made to couple two pipes.
The valve shown has 1 2 in.
From 1 2 to 1 1 2 pipe the face of a fitting to face of another fitting you add 3 4.
Also be sure to check with your local authorities when installing a gas pipe as there may be local codes in place that you must obey for both legal and safety purposes.
Again you are correct that a gas valve is needed near the dryer.
Installation is work intensive but straightforward.
In fact a floor flange is only used to make a supporting pier from pipe materials it is never used for pipes with any flowing fluid inside the pipes.
If necessary use a bushing to reduce the existing 3 4 in.
You start by measuring the run length and cutting the black iron pipe accordingly.