Operation - Graco D51 Instructions Manual

Pressure Relief Procedure
WARNING
PRESSURIZED EQUIPMENT HAZARD
The equipment stays pressurized until pressure is
manually relieved. To reduce the risk of serious
injury from pressurized fluid, accidental spray, or
splashing fluid, follow this procedure whenever you
•
Are instructed to relieve pressure
•
Stop pumping
•
Check, clean, or service any system equipment
•
Install or clean fluid nozzles
1. Shut off the air to the pump.
2. Open the dispensing valve, if used.
3. Open the fluid drain valve to relieve all fluid pressure,
and have a container ready to catch the drainage.
Flush Pump Before First Use
The pump was tested with water. Prior to first use, flush
the pump thoroughly with a compatible solvent.
Reactor feed pumps, part numbers 246484, 246485,
and 257447, were tested with lightweight oil, which is
left in the fluid passages. To avoid contaminating your
fluid with oil, flush the pump with a compatible solvent
before using the equipment. Follow the steps under
Starting and Adjusting Pump.
Starting and Adjusting Pump
Read TOXIC FLUID HAZARD
1.
on page 3.
If lifting the pump, follow the Pressure
2.
Relief Procedure above.
3.
4. Check all fittings to be sure they are tight. Use a
compatible liquid thread sealant on all male threads.
Tighten the fluid inlet and outlet fittings snugly. Do
not overtighten the fittings into the pump.
5. Place the suction tube (if used) in the fluid to be
pumped.
NOTE: If the inlet fluid pressure to the pump is more
than 25% of the outlet working pressure, the ball check
valves will not close fast enough, resulting in inefficient
pump operation.

Operation

Be sure the pump is properly
grounded. Read FIRE AND
EXPLOSION HAZARD on
page 3.
6. Place the end of the fluid hose (K) into an appropriate
container.
7. Close the fluid drain valve (H).
8. With the pump air regulator (G) closed, open all
bleed-type master air valves (B, E).
9. If the fluid hose has a dispensing device, hold it open
while continuing with the following step. Slowly open
the air regulator (G) until the pump starts to cycle.
Allow the pump to cycle slowly until all air is pushed
out of the lines and the pump is primed.
If you are flushing, run the pump long enough to thor-
oughly clean the pump and hoses. Close the air regula-
tor. Remove the suction tube from the solvent and
place it in the fluid to be pumped.
Operation of Remote Piloted Pumps
1. Fig. 2 and Parts Drawings. Follow preceding steps
1 through 8 of Starting and Adjusting Pump.
2. Open air regulator (G).
WARNING
The pump may cycle once before the external signal is
applied. Injury is possible. If pump cycles, wait until
end before proceeding.
3. Pump will operate when air pressure is alternately
applied to push type connectors (16).
NOTE: Leaving air pressure applied to the air motor for
extended periods when the pump is not running may
shorten the diaphragm life. Using a 3-way solenoid
valve to automatically relieve the pressure on the air
motor when the metering cycle is complete prevents
this from occurring.
Pump Shutdown
At the end of the work shift, relieve the pres-
sure as described in Pressure Relief Proce-
dure on page 11.
308981 11