Graco 3A1334E important safety instructions Pressure Relief Procedure, Start-up, Priming the pump

Install only one pump per delivery system. Do not use the pumps in a parallel pump installation.

Loss of pump prime can occur if all the following events occur in sequence:

1.A thermal relief event occurs.

2.The air supply valve is closed.

3.A dispense valve located at an elevation higher than the tank level, is open.

To prevent loss of prime, ensure the air supply valve is turned on before attempting to dispense fluid.

Pressure Relief Procedure

The equipment stays pressurized until pressure is manually relieved. To reduce the risk of serious injury from pressurized fluid, fluid from the valve, or splash- ing fluid, follow this procedure whenever you:

•are instructed to relieve pressure

•stop dispensing

•check, clean, or service any system equip- ment

•install or clean dispensing devices.

1.Close the pump’s bleed-type master air valve.

2.Close the pump air regulator and disconnect the air supply hose.

3.Open the dispensing valve and dispense fluid into a waste bucket/container until pressure is fully relieved.

If you suspect that the dispensing valve is clogged, or that pressure has not been fully relieved after following the steps above, very slowly loosen the dispensing valve coupler or hose end coupling to relieve pressure gradually, then loosen completely.

Operation

Start-up

Determining Output Pressure Using the Air Regulator

To determine the fluid output pressure using the air reg- ulator reading, multiply the ratio of the pump by the air pressure shown on the regulator.

For example a 3:1 ratio oil pump:

3:1 ratio x 100 psi air = 300 psi fluid outlet

A 3:1 pump is capable of 5:1 on the downstroke and will develop 5:1 pressures under normal operation.

A grease pump has a ratio of 50:1. However it is capable of reaching a stall pressure equal to 60 times the air input pressure. To calculate the fluid output pressure using the air regulator reading, multiply the regulator gauge by 60.

For example:

140 psi air x 60 = 8400 psi fluid output

0.97MPa air x 60 = 58.2 MPa

99.7bar x 60 = 582 bar

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

Priming the pump

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 dispens- ing valve into a grounded metal waste container making firm, metal-to-metal contact between the container and the valve.

4.Slowly open the bleed-type master air valve and open the pump air regulator just until the pump is running. When the pump is primed and all air has been pushed out of the lines, release the trigger.

5.If you have more than one pump, repeat this pro- cess for each pump in your system.

NOTE: When the pump is primed and has sufficient air supplied to it, it starts when the dispensing valve is open and shuts off when closed.

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