flight deck

Question 1

what are the 9 parts of the CLA-VAL?

Answer 1

1. fuel main body
2. defuel main body
3. fuel pressure relief
4. defuel pressure relief
5. fuel pressure reducer
6. hydrol valve
7. needle flow control valve
8. ejector strainer
9. solenoid operated pilot valve

Question 2

what is the purpose of the pressure relief control valve?

Answer 2

pen to shift the main valve to the defueling mode when delivery pressure exceeds the preset adjustment

Question 3

what makes up the pressure relief control valve?

Answer 3

a stem, a diaphragm, a spring, and an adjusting screw

Question 4

what is the pressure for the pressure relief control valve set to?

Answer 4

The pressure relief for the defuel valve is set about 7 1/2 psi above delivery pressure. The pressure relief for the fuel valve is set approximately 2 1/2 psi above delivery pressure

Question 5

what is the purpose of the pressure reducer valve?

Answer 5

steadily reduces a higher initial pressure to a lower pressure and regulates the delivery pressure when the main valve is in the fueling mode.

Question 6

the spring on the pressure reducer valve can be adjusted to what psi?

Answer 6

15-100psi

Question 7

what is the purpose of the hytrol valve?

Answer 7

either isolates inlet pressure from the pressure-reducing control valve, or vents inlet pressure to the pressure-reducing control valve and the fuel port of the main valve

Question 8

what is the purpose of the ejector strainer?

Answer 8

reduces inlet pressure to the pressure-reducing control valve, and filters fuel

Question 9

what does the ejector strainer consist of?

Answer 9

orifice plug and a 60-mesh monel screen located between the inlet port and three discharge ports

Question 10

on the ejector strainer, where does the 3 ports direct fuel to?

Answer 10

pressure-reducing control valve, the flow control valve, and the SOPV.

Question 11

what is the purpose of the Solenoid-Operated Pilot Valve (SOPV)?

Answer 11

shifts the CLA-VAL assembly from defuel mode to fuel mode of operation, and vice versa

Question 12

how do you manually operate the SOPV?

Answer 12

A quarter-turn clockwise locks the manual operator in place.

Question 13

where does the 4 ports on the SOPV lead to?

Answer 13

port Q- riser
port R- Defuel main
port S -defuel valve cover chamber
port T- top of hytrol valve