Graco EQ300C manual Flushing the Diaphragm Valve

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Flushing the Diaphragm Valve

This procedure can be performed with the component still mounted in the panel.

If large-grit abrasive or other foreign matter become lodged in the diaphragm valve, it will become necessary to flush the valve. This is a simple procedure; however, it does cause the release of a large volume of air to escape through the released quick coupling. You need to be prepared for the release of air by pulling the quick coupler grommet out of its groove so that it does not get lost.

1.Operate the unit in WASH (see

Using the Wash Feature, page 17) until all abrasive clears from the blast hose.

2.Close the abrasive ball valve, then turn the selector valve to RINSE.

Repair

3.Disconnect the quick coupling at the abrasive ball valve (not at the bottom of the pot).

4.Turn the selector valve to WASH. This will pump water out of the quick coupler and allow you to reach up inside and clear all abrasive and remove the grommet.

5.Make sure nothing is in the path of the open quick coupler, then engage the blast control briefly and several times.

NOTE: High flow air should escape through the cam-lock coupling. If this does not occur, the diaphragm valve is malfunctioning. Replace entire diaphragm canister (EQ5140 – EQ600, EQ5142 – EQ300).

6.Hold the male end of the quick coupler up to the water coming from the cam-lock end of the coupler. Clean off any dirt or abrasive.

7.Turn the selector valve to RINSE to stop the flow of water.

8.Re-insert the grommet into its internal groove inside the cam-lock.

9.Reconnect the quick coupler. If properly cleaned and connected, there should be no leaks at the coupler during operation.

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Contents EcoQuip Vapor Abrasive Blast System Important Safety InstructionsRelated Manuals ModelsDust and Debris Hazard Burn Hazard Compressor Size and Hose Length Minimum ID Metric OEM System GuidelinesMetric EQ300C and EQ600C System Component IdentificationDataTrak see DataTrak Controls, DataTrak ControlsKey Pressure Relief Procedure Operation Checklist Before StartingConnecting the Blast Hose and Air Hose Setting Up the Equipment 10 gal 200-500 lb Ti24824a 0 0 0 8 8 0 0 0 3 Blasting on Higher Surfaces Blasting TipsGrit Size Blast Pressure Abrasive Dose Blast Angle General Metering Valve SettingsWood SteelUsing the Wash Feature Refilling the Pot with Abrasive Shutting Down Operation Winterizing the Equipment Problem Cause Solution TroubleshootingSee Cleaning the Auto-Vent Valve, See Repairing the Main Air RegulatorSee Repairing the Diaphragm Valve See Setting Up the Equipment,Procedure see Shutting Down, Intact. See Hose Schematic,Metering Valve Settings, Properly. See Hose Schematic,See Pressure Relief Procedure, Setting Up the Equipment,If flushing does not solve the problem, see Checking for Leaks Troubleshooting ExamplesPneumatic Blast Control Circuit Repair Repairing the Main Air RegulatorPerform Pressure Relief Procedure, Flushing the Diaphragm Valve Perform the Pressure Relief Procedure, Repairing the Diaphragm ValveCleaning the Auto-Vent Valve Approved Batteries Replacing the DataTrak BatteryReplace Battery Approved Fuses DataTrak Part Series Letter Fuse Required Replacing the DataTrak FuseReplace Fuse EQ300C and EQ600C PartsPressure POT EQ300C and EQ600C Parts ListEnclosure Part Description Qty Enclosure Parts ListRef. Part Description Qty Pressure Pot Parts ListPressure Pot Hose Schematic EcoQuip Skid Systems Vapor Abrasive Blast Systems and AccessoriesEcoQuip Trailer Systems Model Series BrakesTrailer Units Mobile/Skid UnitsModel Model DescriptionModel Description Type Length Blast Control HosesNozzles Common Spare Parts Other AccessoriesDimensions EQ600S Technical SpecificationsEQ300S Graco Information Graco Extended Warranty for EcoQuip Components