Hitachi 309521J To calculate pressure loss, Reduce pressure loss by using

4.Screw ball valves (606, 611 - purchased separately) into fluid mix manifold (607).

5.Select appropriate fittings and fluid hose sizes and lengths to connect between fluid metering manifold 15A898 and mix manifold (607).

Balance pressure drops in the 2 lines as instructed below to assure an accurate mix ratio.

6.Connect fluid lines (provided by installer) between pumps and metering valves (601).

7.Connect mixed material hose to fluid mix manifold (607) outlet (E).

8.Cut air line tubing (included) to length needed to connect between metering valves (601) and sole- noid outlets. FIG. 3, page 10, and FIG. 6, page 13.

9.Cut air line tubing, included, (F, G, H, J - FIG. 3, page 10) to length needed to connect between metering valves (601) and solenoid outlets.

10.Connect ground wires.

Balancing Back Pressure

This procedure is for the remote fluid manifold only.

Flow rates and/or viscosity differences between compo- nent materials can create different pressure drops from the proportioner to the manifold, causing unequal back pressure. This will effect mix ratio accuracy.

Assemble

To calculate pressure loss:

Pressure Loss = 0.000273 x Q x V L

D4

Q = Flow (GPM)

V= Viscosity in centipoise L = Length of pipe in feet

D4 = Pipe diameter to the 4th power

Example: If you need to pump 1 gpm of high solids paint (40 seconds in a Zahn #2 cup = 100 cp) 100 ft. in a sys- tem using 1/4” pipe:

Pressure Loss = 0.000273 x 1 gpm x 100 cp x 100 ft.

(.364 ID) .018 D4 factor

Pressure Loss = 152 psi

Reduce pressure loss by using:

•Large diameter pipe or tubing

•Constant tubing or pipe size

•Long runs without bends

•Long radius elbows

You can balance differences in component back pres- sure by adjusting hose diameter and length.

D4 = .018 for 1/4” pipe

.06 for 3/8” pipe

.15 for 1/2” pipe

Using the previous example (.000273 x 1 x 100 x 100 = 2.73):

Pressure drop: 1/4” pipe = 152 psi 3/8” pipe = 46 psi 1/2” pipe = 18 psi

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