Air System Relief Valves; Fig. 5-33 Pressure Relief Valve - Walinga AGRI-VAC 5614 Operator's Manual And Parts Book

5.2.5 AIR SYSTEM RELIEF VALVES

The air in this system is moved by the blower.
It draws air into the intake side and creates a
vacuum that can pick up and draw the material
into the system. As the air moves through the
blower, it becomes pressurized and flows
through the airlock to move the material out of
the system and to its destination. As the flow
into the intake is restricted, the vacuum will
build until it exceeds the setting of the intake
relief valve. The valve opens to supply a flow
of air to the blower to prevent overheating. A
relief valve on the pressure side will also open
to allow air flow if the airlock (outlet pressure
side of the circuit) is restricted or plugged.
The vacuum side relief valve is set to open at
16 in. Hg vacuum and the pressure relief valve
at 15 psi. Both must function at very close to
these specified levels to insure optimum
capacity and performance. After prolonged
use, the springs in these valves can weaken
causing the valve to open prematurely and
affect machine performance. Dirt and debris
can get caught in the valve seat allowing air
leakage that affects system performance.
To maintain air system relief valves, follow
this procedure:
1. Listen for the valves opening during
operation. They will sound like a popping or a
whistle if they are opening.
2. Install gauges on the vacuum and pressure
sides of the air system.
Fig. 5-32 Vacuum Relief Valve.
Fig. 5-33 Pressure Relief Valve.
Agri-Vac Operator's Manual 34-18148-6 63