pressure and therefore a reducing v

pressure and therefore a reducing valve is used.
Toe main regulating valve is at the autoclave
next to the safety valve which blows off at
100#. A two brancb manifold, eacb branch having
a 8Qut-off, and connected to three gas cylinders,
supplies the reducing valve. The object of using
two separate sources of gas is to be able to use
as much as as possible from each cylinder*:.
The reaction may be started and progress rapidly
at first using low pressure gas. but the last
two thirds requires 90# pressure if time is an
object, Tne procedure is to connect three
cylinders whose pressure has fallen below
to one brancn and to use these wben starting
to carbonate until exhausted, which they do
very quickly. Tben the other branch with three
fresh cylinders is turned on. after shutting off
the low pressure branch, and the reaction
finished at 90#