To test valves used on a torch:
1. Remove check valve from torch.
2. Attach check valve to outlet connection of a regulator which is attached to
a cylinder of the same gas. Tighten securely.
delivery gauge registers 10 psi.
solution suitable for oxygen service across open end of check valve. If
bubbles appear, check valve is leaking and should be replaced. If no leak-
age is evident, release regulator screw, remove check valve, reinstall on
3. Open cylinder valve and turn in regulator pressure-adjusting screw until
4. Place a light film of Oxy-Tec leak test solution (P/N 998771) or any other
torch.
5. Follow same procedure with each check valve.
To test valves installed on regulators:
gen or acetylene). Tighten connection nut. DO NOT open cylinder valve.
1. Attach regulator with check valve to a cylinder of the appropriate gas (oxy-
Release regulator pressure-adjusting screw.
attached to a cylinder of the same gas, which is to supply the back-pressure
2. Attach hose from regulator check valve outlet to outlet of another regulator
for testing. Open the valve of that cylinder.
ery-pressure gauge registers 10 lb. per sq-. in
3. Turn in the pressure-adjusting screw on the second regulator until its deliv-
valve at its outlet. If it starts to move within one minute, the check valve
4. Watch the delivery-pressure gauge on the regulator which has the check
should replaced.
F-12-334-B 12/97 30M Printed in U.S.A.
(over)
Instructions for ESAB Reverse Flow Check Valves
For use on torches with standard B size (9/16-in.18) hose connections.
Oxygen .................. Part No. 639110 Fuel Gas ...... Part No. 629109
For use on regulators with B size outlet connections.
Oxygen .................. Part No. 639209 Fuel Gas ...... Part No. 639210
To replace standard B size regulator outlet connections.
Oxygen .................. Part No. 639112 Fuel Gas ...... Part No. 639111
These check valves are designed to prevent reverse flow of gases into your
hoses or regulators. They are not designed for stopping a flashback. Such re-
verse flow, which can create hazardous conditions, may be caused by (1) a
damaged or plugged tip or nozzle; (2) a cylinder emptying in use; (3) loss of
pressure in one line; (4) failure of operator to follow correct procedures for light-
ing torch.
Torch models 639109 and 639110 are designed for use on torch inlet connec-
tions. Regulator models 639209 and 639210 are for use on regular outlet con-
nections. Screw them on, tighten securely with a wrench. Then attach hoses.
Regulator models 639111 and 639112 replace the outlet connection fittings (1/
4-in. NPT -to- B size) factory-installed on most regulators. First, remove the
original outlet fitting with a wrench. Then apply a single turn of Teflon tape to the
tapered threads of the check valve. Screw it into the regulator by hand as far as
possible. Tighten with a wrench, at least three full turns.
Reverse flow check valves should be tested every six months or whenever they
have been subject to severe torch back-firing or to torch flashback. They should
be replaced every five years, or whenever test indicates need for replacement.
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