Coolant Lines And Valve - Perkins 1200F Series Supplement Manual

1204F - DEF System Supplement
The Perkins tank header incorporates the following features:
4.2.3.1 Tank pick up
The DEF pick-up has a 40μm filter incorporated in the header. The filter is fit for life but can be
serviced if required. The style of pickup was selected as the most compact and beneficial design
with regard to tilt capability.
4.2.3.2 Level Sensor
This level sensor has been carefully designed and validated to work with Perkins supplied DEF tanks.
It measures the DEF level to ensure proper inducement occurs and that all applicable regulations are
met.
4.2.3.3 Temperature sensor
A temperature sensor is incorporated into the base of the header where it will read the DEF
temperature near the DEF pick-up. The readings are used to control the flow of coolant to provide
the proper rate of thawing. The sensor is sealed and not independently serviceable.
4.2.3.4 Heating tube
The tank is heated by engine coolant controlled by the operation of the coolant diverter valve from
the DCU. The coolant flows within a heater tube which runs down and up the centre of the tank
header unit.
Again this design has been optimised and validated specifically for Perkins supplied DEF tanks, which
ensures that the DEF fluid is available at the required rate and condition under all the specified
parameters to ensure emissions compliance.

4.2.4 Coolant Lines and valve

Coolant supply lines are required to supply coolant from engine to the header and into the heating
tube; via the coolant control valve (CCV) to heat the DEF in the tank. These lines must be supplied
by the customer as they are not supplied as part of the engine offering and must adhere to the
mandatory requirements detailed in section 2.10. Guidance on the material and fitting requirements
can be found in section 5.2.1 design considerations
Fig 4.4 below shows the coolant control valve. When closed, a new coolant valve will have a leak
rate of 2 L/h. This leak rate increases to 3 L/h after the valve completes its useful life. These values
are calculated based on an ambient temperature of 20 °C, coolant temperature of 105 °C, and coolant
pressure between 0.5 bar and 1.0 bar.
Fig 4.4 –Coolant Control valve
A&I manual Publication TPD 1832 – Production issue 3. Page 22 of 41