4.5 SET-UP AND TESTING THE FIRST STAGE
Note:
The RaZor regulator has an unbalanced piston 1st stage. Intermediate pressure will begin in the
higher end of the range with high tank pressures and drop as the tank pressure decreases with use. For this
reason, the RaZor’s intermediate pressure must be tested and set at the highest inlet (cylinder) pressure that
the regulator is going to see during use. This is usually 3000-3500 psi (207-241 bar).
4.5.1 Install the normal hoses, fittings and all but one LP Port Plug into the ports of the 1st stage.
4.5.2 In the remaining open port, install an intermediate pressure gauge. Make sure at least one of the ports
has a functioning 2nd stage installed or that the intermediate pressure gauge has an Over-Pressure Relief
Valve.
4.5.3 Turn the Valve Handwheel (25) on the RaZor clockwise to the OFF position.
4.5.4 Slowly (while observing proper safe filling procedures) fill the cylinder using either the 341-FA10-
CL Yoke Fill Adapter supplied with every RaZor, or the 330-6048-AA Filling Whip and Valve Assembly.
Remember that for proper set-up, the cylinder must be filled to the full rated pressure. Disconnect the filling
whip or adapter when finished.
4.5.5 Listen carefully for any leaks. Immerse the RaZor in water if leaks are suspected but not confirmed.
If leaks are found, correct the problem causing the leaks before proceeding.
4.5.6 Position the intermediate pressure gauge so the dial can be seen. See Photo 6.
13
Checking the Intermediate Pressure with a Gauge
4.5.7 Turn the air on to the regulator section of the RaZor by SLOWLY turning the Handwheel (25) coun-
ter-clockwise while listening for any unusual air leaks. If any are heard, turn the air off immediately and
determine the source of the leak. If no leaks are found, watch the intermediate pressure gauge reading rise
as you continue turning the air on slowly. It should stop before 160 psig (11 bar).
4.5.8 If the pressure gauge continues to rise above 160 psig (11 bar), turn the air supply off immediately and
inspect the regulator to determine the cause.
Photo 6
