Graco 425, 300 important safety instructions Operation, Pressure Relief Procedure, Start-up

Operation

Pressure Relief Procedure

WARNING

INJECTION HAZARD

To reduce the risk of serious injury, in- cluding fluid injection or splashing in the eyes or on the skin, always follow the

Pressure Relief Procedure whenever you

DAre instructed to relieve the pressure

DShut off the pump

DCheck or service any of the system equipment

DInstall or clean the grease fitting couplers

DStop dispensing

1.Close the pump air regulator.

2.Hold a metal part of the dispense valve firmly to a grounded metal waste container and trigger to relieve the fluid pressure.

Start-up

1.Close the air regulators and bleed-type master air valves to all but one pump.

2.Open the master air valve from the compressor.

3.For the pump that is connected, trigger the dis- pensing valve into a grounded metal waste con- tainer making firm metal-to-metal contact between the container and valve. Open the bleed-type master air valve, and open the pump air regulator slowly, just until the pump is running. When the pump is primed and all air has been pushed out of the lines, release the trigger.

4.If you have more than one pump, repeat this process for each pump.

Note: When the pump is primed, and with suffi- cient air supplied, the pump starts when the dis- pensing valve is opened and shuts off when closed.

5.Set the air pressure to each pump at the lowest pressure needed to get the desired results.

WARNING

The maximum working pressure of each pump in your system may not be the same. To reduce the risk of over-pressurizing any part of your system, be sure you know the maximum working pressure rating of each pump and its connected compo- nents. Never exceed the maximum working pres- sure of the lowest rated component connected to a particular pump.

To determine the fluid output pressure using the air regulator reading, multiply the ratio of the pump by the air pressure shown on the regulator gauge. For example:

50:(1) ratio x 100 psi air = 5000 psi fluid output

50:(1) ratio x 0.7 MPa air = 35 MPa fluid output

50:(1) ratio x 7 bar air = 350 bar fluid output

Limit the air to the pump so that no air line or fluid line component or accessory is over-pressurized.

CAUTION

Never allow the pump to run dry of the fluid being pumped. A dry pump will quickly accelerate to a high speed, possibly damaging itself. If your pump accel- erates quickly, or is running too fast, stop it immedi- ately and check the fluid supply. If the supply con- tainer is empty and air has been pumped into the lines, prime the pump and lines with fluid, or flush it and leave it filled with a compatible solvent. Be sure to eliminate all air from the fluid system.

Note: A pump runaway valve can be installed on the air line to automatically shut off the pump if it starts to run too fast.

6.Read and follow the instructions supplied with each component in your system.

7.To shut off the system, always follow the Pressure Relief Procedure at left.

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