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Shut-off Valves

During the discussion on CO2 hardware, it was noted that the Nupro M and S
series valves are not "shut-off" valves (i.e. they aren't designed to close
off the flow of gas completely). A "work-around" was suggested in the
archives (there is a small adjusting screw that you can play with to allow
the valve to close more completely) but someone noted that this voids the
valve's warranty.

In looking at the Swagelok catalogue, I see that they DO make shut-off
valves. If you want to be able to totally shut down the flow of CO2, is
there any reason why one of these shut-off valves could not just be placed
in the line (after the regulator and before the needle valve) in series with
the needle valve? Would shutting off the flow in this way cause any damage
to the regulator up-line (back pressure)???


James Purchase