Pressure Relief Procedures; Fluid Pressure Relief Procedure - Graco Uni-Drum Instructions Manual

Pressure Relief Procedures

Pressure Relief Procedures
These procedures describe how to relieve pressure
from the system.
Follow the Pressure Relief Procedure whenever
you see this symbol.
This equipment stays pressurized until pressure is
manually relieved. To help prevent serious injury from
pressurized fluid, such as skin injection, splashing
fluid and moving parts, follow the Pressure Relief
Procedure when you stop spraying and before
cleaning, checking, or servicing the equipment.
34

Fluid Pressure Relief Procedure

This procedure describes how to relieve pressure on the
Follower Plate (D) and in the Pumps (C). Use this
procedure whenever you shutoff the Pumps and before
checking or adjusting any part of the system.
At the Pneumatic Logic Panel (G), perform the following
steps:
1. Close the Main Air Shutoff Valve (P). See F
2. Open any downstream fluid valves, such as the ball
seat applicators on the ram assemblies, that may be
part of the system.
3. Press the BULK SUPPLY DEPRESSURIZATION
Pushbutton on the Junction Box Panel (H).
4. After the pressure is relieved from the Follower
Plate (D), raise the Follower Plate by setting the
RAM POSITION Switch (AG) to the RAISE position.
NOTE: In order to fully relieve system pressure,
including ram cylinders, the steps in the Pneumatic
Pressure Relief Procedure on page 35 must be
performed.
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