Английский для сварщиков. Гричин С.В. - 74 стр.

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74
difference being those designed for fuel gases are not made to withstand the
high pressures that oxygen regulators are subjected to.
In the oxygen regulator, the oxygen enters through the high-pressure
inlet connection and passes through a glass wool falter that removes dust and
dirt. Turning the adjusting screw IN (clockwise) allows the oxygen to pass
from the high-pressure chamber to the low-pressure chamber of the regulator,
through the regulator outlet, and through the hose to the torch. Turning the
adjusting screw further clockwise increases the working pressure; turning it
counterclockwise decreases the working pressure.
The high-pressure gauge on an oxygen regulator is graduated from 0 to
3,000 psig and from 0 to 220 in cubic feet. This allows readings of the gauge
to determine cylinder pressure and cubic content. Gauges are calibrated to
read correctly at 70°F. The working pressure gauge may be graduated in
“psig” from 0 to 150, 0 to 200, or from 0 to 400, depending upon the type of
regulator used. For example, on regulators designed for heavy cutting, the
working pressure gauge is graduated from 0 to 400.
The major disadvantage of single-stage regulators is that the working
gas pressure you set will decrease as the cylinder pressure decreases;
therefore, you must constantly monitor and reset the regulator if you require a
fixed pressure and flow rate. Keeping the gas pressure and flow rate constant
is too much to expect from a regulator that has to reduce the pressure of a full
cylinder from 2,200 psig to 5 psig. This is where double-stage regulators
solve the problem.
Double-Stage
Regulators
The double-stage
regulator is similar in
principle to the one-
stage regulator.
The main
difference being that
the total pressure drop
takes place in two
stages instead of one.
In the high-pressure
stage, the cylinder
pressure is reduced to
an intermediate pressure that was predetermined by the manufacturer. In the
low-pressure stage, the pressure is again reduced from the intermediate
Double stage regulators

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