Blast Machine Troubleshooting

Symptoms

Probable Fault

Action Required

1.1
No air or abrasive passes through the nozzle

Compressor not turned on

Rubber Insert on deadman handle missing

Pressure Regulator (when fitted) not set or malfunctioning

Water Separator blocked

Remote Control Valve not working

Turn on compressor

Check insert & replace if necessary


Check setting
Check for correct operation


Check and clean - See Owners Manual

With safety petcock and deadman handle closed, check remote control valve and along remote control hoses for air leaks and loose connections

1.2
No abrasive passes through the nozzle

 

Abrasive metering valve closed

Damp abrasive or large object restricting flow at base of cone

 

Sleeve valve on remote abrasive valve (when fitted)

 

Open valve

Quickly close and open the choke valve
Remove inspection door assembly and clean out vessel and abrasive metering valve.

Open Valve

1.3
Intermittent flow of abrasive

 

Abrasive metering valve not adjusted correctly

Rubber sleeve in metering valve worn or split

Blockage as 1.2

 

Damp abrasive in machine

 

Check setting


Operate choke valve or clean out vessel and valve as 1.2

Check that water separator is functioning correctly with the drain cock opened to purge moisture

1.4
Abrasive surges from the nozzle

 

Abrasive metering valve opened too fully

Choke valve not fully open

 

Check setting and reduce flow


Check handle position and open

1.5
Pop-up valve will not remain seated against sealing ring

 

Insufficient volume or pressure of air

 

Check air supply from compressor with hypodermic needle gauge.

Close choke valve , if pop-up valve then seals insufficient air supply is available

Check condition of water separator-see Owners Manual

Check action of Remote Control Valve

1.6
Pop-up valve will not drop after depressurisation

 

Worn pop-up valve and/or sealing ring

Abrasive trapped in vertical pipe work

 

Remove and replace both valve and sealing ring

Remove inspection door assembly and pop-up valve then clean out

1.7
Machine will not depressurise

 

Blockage in deadman handle and/or Remote control hoses

Faulty Remote Control Valve

 

Remove and clean out

 

Remove and repair