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Konus Burners, Primary, and Vat Pumps

Konus Burners, Primary, and Vat
Pumps

Symbol Description
AV1 Air Pilot Valve

When the valve solenoid is de-energized, pilot pressure to the No.
3WV valve is ported to the atmosphere. This allows the stem of the
No. 3WV valve to move downward. When the stem is fully down, as
in the emergency mode, flow from the operating vat pump will be
directed through the valve and return to the Konus. When the valve
solenoid is energized, the pilot valve spool will shift to the closed
position. Air flow from the pilot chamber to the atmosphere is then
blocked. AV1 is a normally open, two position, two way, single
solenoid, spring return, directional valve.

AV2 Air Pilot Valve

This valve is energized and de-energized to control the position of the
No. 3WV valve. When this solenoid energizes, the pilot valve spool
will shift open. The AV1 valve will be energized at the same time.
This permits air pressure to flow into the pilot chamber of the No.
3WV three-way valve. This permits the valve stem to move upward.
When in the fully up position, oil will flow from the primary pump
through the No. 3WV valve and return to the Konus burner.

AV3 Air Pilot Valve

When the system is operating in the normal mode, the solenoid on
this valve is energized. Air pilot pressure is then directed to shift the
No. 2WV two-way valve into the open position. The stem on the No.
2WV valve will move toward the pilot head in this condition. There is
an orifice plate inside the No. 2WV valve. This orifice plate will limit
the maximum flow through the valve for a given inlet pressure.

Troubleshooting Thermal Oil Systems Page 1