DirectFlo DF1400
Chapter 5: Trouble-Shooting and Repair
Comco Inc.
5-13
Issue Date: January 2009
Inspecting and Repairing the PowderGate
The PowderGate is a control valve for turning ON and OFF the abrasive flow to the
nozzle. The PowderGate has been designed for minimal maintenance. However over
time the polymer nosepiece will wear and require replacement. If leakage through the
nose tip is observed when the PowderGate is in the closed position then replacement of
the nosepiece is required. If after replacing the Nosepiece the PowderGate continues to
leak through the nozzle, then the carbide seat in the Nose & Valve Seat Assembly is
excessively worn.
Replacing the Polymer Nosepiece or Nose & Valve Seat Assembly:
You do not have to remove the PowderGate Assembly from the Blaster to
replace a worn nosepiece.
1.
Turn power OFF, vent pressure from tank and disconnect air supply from
unit.
2.
Reaching through the large hole in the blasters back panel wit
h a 3/32”
hex T-wrench, remove the 4 socket head cap screws, Nose & Valve Seat
Assembly and its O-ring.
3.
Remove the blue polymer nosepiece from the end of the Piston Rod by
gently wiggling it back and forth and pulling it out toward you with a pair of
pliers. The nosepiece is retained on the end of the piston rod by a barb.
4.
Install the new nosepiece by pushing it onto the barbed tip of the Piston
Rod. Be sure the nosepiece is seated straight and against the shoulder
of the Piston Rod.
5.
Inspect the carbide seat inside the Nose & Valve Seat Assembly. It
shows noticeable wear then it should be replaced. The seat is bonded
into the Nose and is replaced with the nose as a complete assembly.
6.
Replace the Nose & Valve Seat Assembly. Secure in place with the 4
socket head cap screws.
Figure 5-2:
PowderGate Nosepiece and Nose & Valve Seat Replacement
