Great Plains YP2425F-2470 Operator Manual - Manual (Page 66)

62 YP2425 & YP2425F Table of Contents Index Great Plains Manufacturing, Inc.
401-406M Table of Contents Index 2014-07-14
Fertilizer Orifice Plates
Agricultural Chemical Hazard:
Wear protective gloves when changing orifice plates.
Refer to Figure 72
In general, the orifice
needs to be small enough to
create at least 15 psi pressure in the manifold but large
enough to prevent the manifold pressure from exceeding
65 psi.
The minimum pressure is required to even out the flow of
fertilizer between rows. To reduce orifice plugging and
pump wear, use the largest orifice practical for your
fertilizer application rate. Alternate orifice plates are
listed in the Seed Rate manual.
The best pressure range to maintain is 20 to 40 psi to
ensure optimum distribution while minimizing leakage.
Built-in check valves at the row units prevent flow below
15 psi.
The Seed Rate Chart book for this planter (manual part
number 401-406B) contains a table of orifice sizes in
gallons per acre.
Orifice plates do not set fertilizer rate. Rate is set at the pump.
Figure 72
Fertilizer Orifice Plate
29984
1
1