Graco Python A25011, Instructions - Parts Manual

Page: 10 / 58

Installation
10 3A4386E
Connect Pneumatic Supply
1. Install the pneumatic regulator (E) and gauge to
control the inlet pressure. See Models on page 3 for
your model’s maximum pneumatic pressure.
NOTE: If less than 200 psi supply pressure is used, the
pump’s maximum output pressure will be decreased
proportionally. See Minimum Gas Pressures by Fluid
Plunger Size and Outlet Pressures on page 11. Mini-
mum Gas Pressure can be found by first finding the
table that corresponds to the plunger size. Next, using
the column that corresponds to the air motor size, find
the row equal to or slightly greater than the outlet pres-
sure of the pump. The value is the Minimum Gas Pres-
sure required to achieve the fluid outlet pressure.
2. Install a pneumatic line filter (C) to keep debris from
affecting pump performance and to increase pump
life.
NOTE: Keep the timing valve knob closed at this point
to keep the pump from operating without fluid, which
minimizes seal wear.
3. Attach a pneumatic line to the 1/8 in. female NPT
port (116) on the timing valve. (See Python Timing
Valve Assembly, page 41.) An 1/8 in. NPT fitting is
preferred, though a 1/8 in. - 1/4 in. NPT adapter is
included for convenience.
Connect Chemical Outlet
1. Connect a 1/4 npt(f) fluid line from the outlet check
valve (M) to the injection point.
NOTE: On high pressure configurations
(PCI-xxx-xxH-xx-x), the 1/4 npt(f) fitting is replaced with
an HiP HF4 fitting.
2. Install a pressure relief valve (J) on the outlet side of
the pump.
NOTE: A pressure relief valve is available from Graco
and can be connected back to the tank or directly to the
inlet side of the pump. See Kits and Accessories on
page 43.
3. Set the pressure relief valve at or below the maxi-
mum working pressure of the pump.
4. Connect a 10-32 UNF fluid outlet from the
prime/bleed valve (21) to the fluid source or waste
reservoir.
NOTE: On high pressure configurations
(PCI-xxx-xxH-xx-x), the 10-32 fitting is replaced with a
1/16 in. NPT(F) fitting.
In the event of an injection line blockage, to reduce the
risk of skin injection and damage to the pump, ensure
the pressure relief valve is set at or below the maxi-
mum working pressure of the pump.