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Great Plains NP30A 30-foot Operator Manual User Manual

Page 29

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Great Plains Manufacturing, Inc.

Table of Contents

Index

Metering Overview

25

2014-05-20

Table of Contents

Index

407-502M

A37.Section Control Relief Valve

(Section Control Option Only)
In normal operation, this valve never activates.
NH

3

can get trapped in the system between the

section control check valve

and the section

shut-off valves

, if all section valves are closed

while the system is charged. As the liquid warms
and pressure rises, this relief valve protects the
system with periodic releases.

This valve is set to activate at 350 psi.

Operator action is periodic inspection, and to
replace this hydrostatic relief valve, a time-dated
part, when it reaches the end of its operating life
(see page 117). See “Hydrostatic Relief Valve
Maintenance
” on page 114 f
or maintenance.

A38.Section Flow Divider

(Section Control Option Only)
This is a CDS-John Blue

®

Impellicone

®

manifold.

It evenly splits the NH

3

flow for distribution through

the row flow dividers

. There are no operational

items for this component.

A39.Section Shut-Off Valves

(Section Control Option Only)
These are the normal controls for suspending
per-section application flow in the field (for point
rows, pass overlap, etc.). These are open/close
solenoid valves controlled by the “BOOMS”
switches on the SCS 450.

When used with the SCS 450 or other suitable
sectional application controller, shutting off a
section causes the total flow to be reduced by

1

3

of

the all-sections-on rate, keeping the rate constant
for the section(s) still active.

Each section valve has a visible indicator above the
valve ball casing, indicating whether open or closed.

Operation of each section valve is essentially
instantaneous. However, there is considerable
residual NH

3

in the section flow divider and delivery

tubes after shut-off. When console power is off, the
valves remain at their most recent setting.

The valve balls are equipped with a downstream
relief orifice.

A40.Row Flow Divider(s)

This is a CDS-John Blue

®

Impellicone

®

manifold. It

evenly splits the NH

3

flow for distribution through

the delivery tubes

. There are no operational

items for this component.

A41.Flow Divider Manifold Inlet

NH

3

liquid flow enters the flow divider here.

A42.Flow Divider Pressure Gauge

This gauge reports the pressure prior to flow
division. It normally reads lower than the cooler and
nurse tank pressure gauges.

A43.Flow Divider Outlet

Each of these ports receives an equal fraction of the
NH

3

liquid flow.

A44.Flow Divider Plug

Unused ports are plugged with a steel NPT plug.
Unused ports do not affect flow balance at the other
ports.

A45.Delivery Tube

This tubing passes NH

3

liquid flow to the knives or

tines. Operator action is to replace this tubing, a
time-dated part, when it reaches the end of its
operating life. See page 118.

A46.Knife or Tine (Single)

Knives and tines open a furrow and inject the liquid
NH

3

. Tines inject the liquid in the furrow opened by

the anhydrous coulter. All but two (or four) of the
rows are equipped with knives or tines having a
single smaller liquid delivery tube. Knives and tines
need frequent inspection for wear and damage.

A47.Cooler Vapor Outlets (2)

Two vapor outlets direct the now-gaseous
refrigerant flow (that entered at

) to two special

knives or tines

per cooler.

A48.Vapor Tube

This tubing passes NH

3

vapor flow to the dual

knives or dual tines. Operator action is to replace
this tubing, a time-dated part, when it reaches the
end of its operating life. See page 118.

A49.Knife or Tine (Dual)

There are two of these special knives or tines per
cooler (four total on a dual-cooler applicator). They
direct the vaporized refrigerant NH

3

gas into the soil

at the larger rear vapor tube. They are otherwise
identical to the single-tube knives and tines

.

A35

A39

A40

A45

A34

A49

A46

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