4-18
SET-UP AND SAFE OPERATING PROCEDURES
0056-0114
TERMS YOU SHOULD KNOW
Backfire The return of the flame into the torch, producing a popping sound. The flame will either
extinguish or re-ignite at the tip.
Sustained
Backfire
The return of the flame into the torch with continued burning within the torch. This
condition may be accompanied by a popping sound followed by a continuous hissing
or whistling sound.
Flashback The return of the flame through the torch into the hose and even into the regulator.
It may also reach the cylinder. This condition could possibly cause an explosion in
the system.
4.03 TORCH HANDLE
A torch handle is essentially a set of gas tubes with control valves. One tube and valve controls the
fuel supply and the other tube and valve controls the oxygen supply. The torch handle is not designed
to mix the gases for oxy-fuel processes. The apparatus attached to the handle mixes the oxygen and
fuel gases. The handle is a means of control for the gas supply.
VICTOR
®
torch handles consists of six basic elements, shown in Figure 4. The control valves with
internal reverse flow check valves, the body “Y” with internal flashback arrestors, the barrel and tubes
(located inside the barrel) and the torch head.
NOTE
VICTOR
®
torch handle model numbers that contain the letters “FC” are equipped with
built-in flashback arrestors and check valves (i.e 315FC). Model numbers with a “C”
only contain built-in check valves (i.e. 315C). Earlier versions without an “F” or “C” in the
model number contained neither (i.e. 315). For all “C” model torch handles and earlier
versions, it is recommended that add-on flashback arrestors be installed. Most add-on
flashback arrestors also contain built-in check valves.
dwg-00379
BODY “Y”
BARRELTORCH HEAD
CONTROL VALVES
INTERNAL REVERSE FLOW
CHECK VALVES
INTERNAL FLASHBACK
ARRESTORS
Figure 4: Torch Handle Features
Oxy-Fuel Apparatus
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