Great-plains NP4000B Operator Manual User Manual download pdf (Page 31)

Great Plains Manufacturing, Inc. Table of Contents Index Application Overview 27

2014-05-14 Table of Contents Index 417-199M

A61.Bleed Valve(s)

Hose valves typically have bleed valves. Have the

hose provider explain exactly what is bled by each

bleed valve.

The purpose of a bleed valve is to perform a

controlled release, via an oriﬁce, of any ﬂuid or gas

trapped in the closed line prior to disconnect at a

nearby Acme ﬁtting.

A single bleed valve may be located on the inlet or

outlet side of the valve, and only protects that side

of the circuit when the valve is closed. More rarely, a

shut-off valve has bleed valves on both sides of the

valve. An older ball valve may have a bleed valve for

the ball itself.

A65.Withdrawal Valve

In ﬁeld operations, this valve is

opened ﬁrst, and

closed ﬁrst.

The withdrawal valve is the application outlet valve.

It is usually located on the tank top, but may be

located on the bottom. It is color coded red or

orange.

A67.Pressure Gauge

This gauge reports the pressure (usually in psi) of

the NH

gas at the top of the tank. The reading

varies with tank and ammonia temperature.

Suffocation, Blinding and Burning Hazards:

See “About Bleed Valves:” on page 38.

Ammonia Release Hazard:

Never open the withdrawal valve unless:

a. all other valves and bleed valves, are closed, or;

b. the applicator is conﬁgured and ready for use.

Always be on the up-wind side for valve operation.

Always open slowly.

Always check for signs of release when opening this

valve.

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Great-plains NP4000B Operator Manual User Manual Page 31