Pressure Relief Procedure; Safety Relief Valve - Graco 25C539 Instructions - Parts Manual

Pressure Relief Relief Procedure Procedure
Pressure Pressure Relief Procedure
Follow the Pressure Relief Procedure
whenever you see this symbol.
The agitator and pressure tanks remain pressurized
until pressure is manually relieved. To help prevent
serious injury from splashing fluid and moving
parts, follow this procedure:
• Before you check or service any part of the spray
system
• Before you loosen or remove the pressure tank
cover of fill port
• Whenever you stop spraying
1. Shut off the air supply to the tank by closing the
air inlet valve (17).
2. Open the drain cock fitting (7) by turning it
counterclockwise.
3. Wait until there is no air escaping through the
drain cock fitting before removing the cover or
opening the fill port.
4. Leave the drain cock fitting (7) open until you
have reinstalled the cover or fill port.
Note
Tighten the c-clamp to 8-10 ft-lb. (10.8-13.6
N•m), approximately 1/2 to 1 turn past hand
tight.
3A4797F
Safety Relief Relief Valve Valve
Safety Safety Relief Valve
A safety relief valve (4) automatically relieves the
tank pressure when the air pressure exceeds 95 to
100 psi (0.5 to 0.6 MPa, 6.5 to 7 bar).
Each week, check the working order of the safety
relief valve. Only as a test
to 95 to 105 psi (0.5 to 0.6 MPa, 6.5 to 7.1 bar). If
the safety relief valve does not relieve the pressure,
replace it immediately. Do not attempt to repair it.
The safety relief valve will reset automatically when
the pressure is relieved.
Operation
, raise the air pressure
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