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Manual Revision: Feb 18
Copyright © 2011-2018 Pirate Brand®, All Rights Reserved
6
C-Series - 3.0 / 6.0
Cu Ft
User’s Manual
How CPR Systems Work
(Pressure Release)
WARNING
: This section of the manual is designed to give you a general understanding of how
the Abrasive Blaster functions.
All
sections of this manual must be read and understood before
operating the equipment.
Flow of Compressed Air
Flow of Abrasive
Flow of Exhaust Air
During Blow-down
ADDING ABRASIVE
Abrasive is added through the hole in the top of the Abrasive Blaster where the Pop-up and its seat are
located. When abrasive is added, it flows down through the hole, around the Pop-up, and down to the
bottom of the pressure vessel where it will exit through the Metering Valve when blasting is started.
PRESSURIZATION
When a compressed air source (such as an air-compressor) is connected to the inlet of the Abrasive
Blaster and the Inlet Shut-Off Valve is opened, compressed air flows to the Inlet Valve where it is stopped.
When the control handle is activated, the Inlet Valve opens and air flows into the Pressure Vessel causing
the Pop-up (located internally) to seal against its seat. Simultaneously, the Diaphragm Valve (Outlet Valve
on older models) closes sealing the Pressure Vessel allowing it to hold pressure. Air will also continue
past the Choke Valve, through the Pusher Line, and finally to the “Y” under the Metering Valve where it
is mixed with abrasive. The mixture of compressed air and abrasive will now exit the Abrasive Blaster
through a blast hose and nozzle connected to the coupling under the Metering Valve and blasting begins.
It is important to note that, some abrasive will collect at the base of the Metering Valve causing the blast
hose to pulsate and spray abrasive erratically for a short time while pressure builds up in the pressure
vessel. This is normal and will not damage the Abrasive Blaster.
DEPRESSURIZATION (BLOW-DOWN)
When the control handle is released in a pressure release (CPR) system, the Inlet Valve automatically
closes stopping the flow of compressed air into the Pressure Vessel. Simultaneously, the Diaphragm
Valve (Outlet Valve on older models) opens allowing the compressed air in the pressure vessel to exit the
Abrasive Blaster through the Diaphragm Valve (Abrasive Trap & Outlet Valve on older models), and finally
through the Muffler. When all the pressure in the Pressure Vessel is released, blasting stops.