Check Hydraulic Pressure
The pressure gauge on the manifold block indicates the pressure
at the carriage valve. How much pressure depends on the
position of the selector valve and the pressure set on the specific
pressure reducing valve. With the selector valve up, the facing
pressure can be set. It may be necessary to adjust the carriage
pressure, while facing, with the top pressure reducing valve to
control facing pressure.
Shift the selector valve to the center position, and set the heating
pressure (if required). If heating pressure is not required, set the
pressure reducing valve at its lowest setting, or the drag pressure,
whichever is higher.
With the selector valve in the down position, the fusion pressure
can be set.
The heating and fusion pressures can be calculated using the
enclosed fusion pressure calculator. Always add drag pressure
to the calculated gauge pressure. Drag pressure should be
determined using the following procedure:
After facing the pipe, move the carriage so that the pipe ends are
approximately 2" apart.
Shift the carriage control valve to the middle (neutral) position.
Select the heating mode, and adjust the middle pressure reducing
valve to its lowest pressure by turning the valve counterclockwise.
Shift the carriage control valve to the left.
Gradually increase the pressure by turning the valve clockwise.
Increase the pressure until the carriage moves.
Quickly reduce the heating pressure valve counterclockwise until
the carriage is just barely moving.
Record this actual drag pressure.
Take the pressure, determined from the calculator, then add the
actual measured drag pressure. This will be the actual fusion
pressure to set with the bottom pressure reducing valve.
TX01894-11-15-00
CD00138B-9-12-94
PH01761-11-1-99
Install Clamping Inserts
Select and install appropriate clamping inserts for the pipe that
is being fused.
TX00368-9-15-94
Operation
PH00304-9-24-93
3 - 3
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