Repairing the Diaphragm Valve | Graco EQ300C manual

Repair

Repairing the Diaphragm Valve

NOTE: The diaphragm (17C127 – EQ300, 17C128

–EQ600) can be replaced without removing the assembly from the panel. You will need an 8 mm Allen wrench for the EQ600S and a 6 mm for the

EQ300S.

1.Perform the Pressure Relief Procedure, page 8 .

2.Loosen all 4 Allen-head cap-bolts evenly and then remove them completely while supporting the canister of the diaphragm valve.

3.Replace the diaphragm (natural rubber compound) and hand-tighten it as far as possible to establish the alignment with the canister.

NOTE: There are two shims between the diaphragm and the actuator. Keep the shims and reuse them (they do not come with the replacement diaphragm). Do not cause any pre-load or torque on the diaphragm by over-tightening it in a misaligned position.

4.Insert all 4 Allen-head cap bolts but do not tighten them.

5.Apply more than 80 psi (5.5 Bar, MPa) air pressure to the regulator inlet to cause the piston to retract.

6.With the piston retracted, hand-tighten the 4 Allen-head cap bolts.

7.Release the air pressure.

8.Tighten the cap-bolts in an alternating pattern (see image below) to 80 +/- 8 in-lb (9 +/- 0.9 N•m). This will cause a slight bulge in the diaphragm between the canister and the stainless steel casting.

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9.Test and confirm that the unit is working properly.

NOTE: This can be done using only water to charge the equipment – there is no need to use abrasive for this test.

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Graco EQ300C manual Repairing the Diaphragm Valve, Perform the Pressure Relief Procedure

Contents

Important Safety Instructions EcoQuip Vapor Abrasive Blast System Models Related Manuals Dust and Debris Hazard Burn Hazard OEM System Guidelines MetricCompressor Size and Hose Length Minimum ID Metric System Component Identification EQ300C and EQ600C DataTrak Controls KeyDataTrak see DataTrak Controls, Pressure Relief Procedure Checklist Before Starting Operation Connecting 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 Tips Blasting on Higher Surfaces Wood Metering Valve SettingsGrit Size Blast Pressure Abrasive Dose Blast Angle General Steel Using the Wash Feature Refilling the Pot with Abrasive Shutting Down Operation Winterizing the Equipment See Cleaning the Auto-Vent Valve, TroubleshootingProblem Cause Solution See Repairing the Main Air Regulator Procedure see Shutting Down, See Setting Up the Equipment,See Repairing the Diaphragm Valve Intact. See Hose Schematic, See Pressure Relief Procedure, Properly. See Hose Schematic,Metering Valve Settings, Setting Up the Equipment, If flushing does not solve the problem, see Troubleshooting Examples Checking for Leaks Pneumatic Blast Control Circuit Repairing the Main Air Regulator Perform Pressure Relief Procedure,Repair Flushing the Diaphragm Valve Repairing the Diaphragm Valve Perform the Pressure Relief Procedure, Cleaning the Auto-Vent Valve Replacing the DataTrak Battery Replace BatteryApproved Batteries Replacing the DataTrak Fuse Replace FuseApproved Fuses DataTrak Part Series Letter Fuse Required Parts EQ300C and EQ600C EQ300C and EQ600C Parts List Pressure POT Enclosure Enclosure Parts List Part Description Qty Pressure Pot Parts List Pressure PotRef. Part Description Qty Hose Schematic EcoQuip Trailer Systems Vapor Abrasive Blast Systems and AccessoriesEcoQuip Skid Systems Model Series Brakes Model Mobile/Skid UnitsTrailer Units Model Description Hoses NozzlesModel Description Type Length Blast Control Other Accessories Common Spare Parts Dimensions Technical Specifications EQ300SEQ600S Graco Extended Warranty for EcoQuip Components Graco Information