I've installed Blain rupture valves. Always work as they're supposed to and are easy to adjust. SEES sells them, but will be cheaper if you buy directly from Blain and don't pay the middleman.
Rupture valves are as easy to install as any other piping part, make sure its sized properly for the expected GPM flow and install as close to the jack (or T fitting if two jacks) as possible, by code less than 12". The most important part is making sure it faces the correct direction. You'd basically be cutting the oil line open and redoing a couple if pieces of pipe to add it in the middle. I hope they're victaulic jobs. If not, I'd cut the pipe with a roller cutter (important, no metal shavings) then unthread the pieces you need, install threaded to vic groove adapters and reinstall removed pieces and valve with vics. If the pipes too close to the floor you may have to use a jack hammer to make a bowl for it to be in.
Testing is generally easy, as long as your valves cooperate. You set the control valve at normal speed down with a full load in the car, get the car speed. Then you adjust the car to run between 110% to 140% of full load speed by cranking your down fast adjustment faster and if necessary to get more speed, hold the manual lowering valve at the same time. Once you get the car running between 110% and 140% coming down you adjust the rupture valve to trip. It's a trial and error process. If it came down and didn't trio, run the car up get in the pit and turn the adjustment one turn then try again. Keep doing this until it trios. Now put your control valve back to normal and make sure it will run top to bottom at full speed and NOT trip when Ira running at 100%. Now your rupture valves adjusted and you can seal it. See code 3.19.4.7 for details on code requirements. If you have a good inspector, you don't need to get speeds, just set it to trip at a speed faster than normal down full load speed but not trip coming down with a full load in it with the valves set normally.
I highly recommend a maxton safetach if you don't have one. Will make your life a thousand times easier and 2000 times safer.
Just wondering, are yall just doing this to make a few bucks because the inspector recommended it, or is he trying to force yall to add them?
