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 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 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 |
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