Tweco Victor Torch Handles,Cutting Attachments - Manual (Page 18)

5-14
CaUtion
Check valves are mechanical devices that can leak when dirty
or if abused. Check valves should be tested at least every six
months, more often if hoses are frequently disconnected. Careless
usage, dirt or abuse can shorten the service life of check valves,
thus requiring more frequent testing. Follow the manufacturer’s
instructions for testing the check valves.
note
Reverse flow check valves are not the same as flashback arrestors.
Check valves are designed to help prevent reverse flow of gas
upstream of the torch. Flashback arrestors are designed to prevent
mixed gases from igniting upstream of the flashback arrestors.
5.02 FLAshBAck ARRestoRs
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.
Most VICTOR ® torch handles are equipped with built-in flashback arrestors.
Flashback arrestors are designed to prevent mixed gases from igniting
upstream of the flashback arrestors.
CaUtion
It is not recommended to use accessory flashback arrestors on
VICTOR ® FC torch handles since these devices are already built-in.
Excessive flow restrictions may occur.
The flashback arrestors contained in this torch are designed to prevent a
flashback flame from entering the hose and gas supply system. A very fine
“filter-like” sintered stainless steel flame barrier stops flashback flame.
For maximum service life of the flashback arrestor, completely purge
all lines and hoses before connecting to the torch. This removes loose