Volume Balancing the Mix Manifold

Volume Balancing the Mix Manifold

If the mix manifold is mounted on the machine, you do not need to adjust the restrictor (F). Leave open two turns minimum.

When the manifold is remote, two things must be done to reduce momentary ratio errors that can occur due to the compressible nature of paint hoses.

•Adjust Restriction

•Select correct sized hoses

Adjust Restriction at the Mix Manifold

The B side restrictor (F) in the mix manifold is only used when the mix manifold is positioned remote from the machine with a short mix hose to the spray gun.

The restrictor (F) controls “lead/lag” ratio errors of the A and B flow into the static mixer tubes. These errors occur momentarily when the gun opens. The error is caused by differences in viscosity, volume, and hose expansion between the proportioner outlets and the mix point.

Adjust the restrictor (F) stem clockwise while spraying until you see a slight rise in the B side pressure gauge. The point where the pressure starts to rise is a good adjustment setting.

restrictor stem

NOTE: Unless you are dispensing directly out of the mix manifold and mixer, this an approximate adjust- ment.

For low viscosity fluids, an optional 40 mesh screen can be installed in the mix manifold, in front of the restrictor. This keeps the carbide tapered stem and seat from plugging.

For high viscosity 1:1 applications, the entire restrictor assembly and seat can be removed and replaced by a high pressure 3/4 npt plug.

Hose Selection for Feeding A Remote Mix Manifold

The mix manifold can be removed from the machine and used closer to the spray gun to minimize the mixed material in the hoses and reduce flush solvent with the following restrictions.

•Only one mix manifold can be used on a propor- tioner.

•Splitting flow to two or more guns can only be done after the two fluids are mixed.

NOTE: This applies to applications that are not 1:1 ratio, and don’t have near balanced viscosities.

Balance the hoses inside area sizes in relation to the mix ratio by volume. This is most important when the mix manifold gets close to the spray gun.

The proportioner will put out the two materials in the exact ratio by volume. If the hose sizes are not balanced to the ratio, one hose will always come up to pressure first. This ratio error at the mix point can occur anytime that there is a change in pressure. Balance the hose sizes by effective area, not by inside diameter.

Area = (3.1416 * radius2) or see Table 1.

NOTE: For balancing purposes, it is always assumed that the A side is the high volume side.

Table 1: Volume Ratio of “A” to “B” Hose

 

Hose Selection

 

Mix Ratio

“A” x “B”

Volume Ratio

 

 

 

1:1

1/2 x 1/2

1.0:1

 

3/8 x 3/8

 

1.5:1, 2:1

1/2 x 3/8

1.78:1

2:1

3/8 x 1/4

2.25:1

2.5:1

3/8 x 1/4

2.25:1

3:1

 

 

4:1

1/2 x 1/4

4.0:1

Example: At a 4:1 mix ratio, a 1/2 in. ID resin hose and a 1/4 in. ID hardener hose matches the 4:1 volume ratio.

3A0590G

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Graco 3A059OG important safety instructions Volume Balancing the Mix Manifold, Adjust Restriction at the Mix Manifold
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3A059OG specifications

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