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Konus Burners, Primary, and Vat Pumps

CV2 Check Valve

This check valve will allow the return oil to flow back to the Konus
burners. When the MV1 manual valve is opened this check valve will
block the primary pump’s volume to the return line.

EV1 Directional Valve

This valve is controlled by the AV5 air pilot valve. When in the normal
mode of operation, the AV5 solenoid is energized, which directs pilot
pressure to shift the EV1 valve closed. Flow is blocked from the
operating Konus burner to the suction of the vat pump. In the
emergency mode of operation, the AV5 solenoid will de-energize. Air
pressure holding the valve closed will then be ported back to the
atmosphere. This permits the EV1 valve to shift open. This creates a
flow path from the No. 1 Konus burner to be ported to the suction line
of the operating vat pump. The vat pump will then port the oil through
the HE heat exchanger located in the log pond. The heat exchanger
will dissipate the heat in the oil to the ponds. The thermal oil will then
flow through the No. 3WV valve and back into the No. 1 burner.

Troubleshooting Thermal Oil Systems Page 5