Graco 965466 Manual De Usuario

Set the ratio based on your situation.  If :

•  The fluids are supplied at a ready–to–spray

viscosity, simply set the ratio as explained under
Adjusting the Ratio.

•  The fluids are NOT supplied at ready–to–spray

viscosity, the ratio must be determined after the
reducer is added to the base, as instructed in
Procedure 1, below.

NOTE:  Evaporation of the reducer in the base causes

changes in the ratio. To prevent evaporation, store
the base in a closed container.

NOTE: Some reducers have very little ability to lubricate

and many cause seals to dry out. To prolong the
seal life, be sure your pump seals are compatible
with the base’s reducer. Contact your Graco
representative for the correct seals to use.

When adding the reducer to the base before proportioning

with the VRHC system, determine the ratio of the
base/reducer mixture to the catalyst in order to set the
proper ratio.

Example:

The instructions on the can say “Mix 5 parts base to 1 part
catalyst. Then reduce 3 parts of this mixture to 1 part
reducer.”

1. Add the parts of the base and catalyst to find the parts

parts base

+            1

parts catalyst

parts mixture

2. The next statement on the can says, “Reduce 3 parts of

the mixture.” So divide the parts of the mixture by 3 parts
to reduce to find the parts reducer.

parts mixture

/             3

parts to reduce

parts reducer

3. To determine the ratio of the secondary pump, add the

appropriate  parts of base and reducer to find the parts
combined base/reducer.

parts base

+            2

parts reducer

parts combined base/reducer to
1 part catalyst

The ratio of the pump is 7:1.

Moving the fulcrum point away from the primary pump

reduces the secondary stroke length, reducing its fluid
output. Moving the fulcrum point closer to the primary pump
increases the secondary stroke length, increasing its fluid
output.

Fig. 5 shows the relationship between the primary pump
and the secondary pump.

See Fig. 2. Use a wrench to rotate the ratio adjustment
screw (S).  Rotating the screw clockwise will increase the
ratio.  Rotating the screw counterclockwise will decrease
the ratio.  The indicator pin (V) will move along the ratio
indicator scale (U) as the ratio adjustment screw is rotated.
When the pin is above the desired ratio, remove the
wrench and perform a ratio test as described on page 12.