The pneumatic circuit shown in the...

Question 1 / 205eccefa2bacbc34ba4d47768

Question 1 of 205eccefa2bacbc34ba4d47768

The pneumatic circuit shown in the illustration is part of a complex control circuit for a large low speed diesel engine. How will the operation of the engine be affected if the line from the double check valve to the servo motor is severed? See illustration MO-0117.

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🔍 Key Concepts

• Function of the shutdown servomotor in relation to the fuel rack (does air pressure move the rack to fuel ON or FUEL OFF?) • Purpose of a double check valve in a safety/shutdown circuit (what does it do with two possible air inputs?) • What happens in a pneumatic safety system when the control signal line is lost or vented to atmosphere (fail‑safe or fail‑danger?)

💭 Think About

• Trace the air path from the control air supply and emergency stop button through valves B and C, to the double check valve, and finally to the shutdown servomotor. If the line after the double check valve is severed, where does the air go and what pressure does the servomotor see? • Look at the spring symbol in the shutdown servomotor. With no air pressure on the piston, which way does the spring force drive the fuel rack – toward more fuel or toward zero fuel? How would that affect engine operation and restarting? • Why are two separate oil signals (reversing servomotor and running direction safeguard) both able to act on the same air line through a double check valve? What common safety action are they both trying to achieve on the engine?

✅ Before You Answer

• Be clear whether loss of air pressure to the shutdown servomotor will tend to shut down the engine or allow it to keep running. • Confirm from the diagram which side of the servomotor is connected to the control air and which side has the return spring acting on the fuel rack linkage. • Verify how an open, severed line behaves in a pneumatic system (air escapes to atmosphere, line cannot build pressure), and relate that to the ability of the shutdown servomotor to override the governor.

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Question 1 of 20

The engine will continue to operate; however, restarting of the engine will be difficult.

The engine will automatically stop, although there will be no difficulty in restarting the engine.

The shutdown servo motor will develop a force overriding the output of the governor, causing in the fuel to the engine to be secured.

The safeguard provided by these devices will result in a temporary cessation of air flow through valve "D".

Question 1 / 205eccefa2bacbc34ba4d47768

Question 1 of 205eccefa2bacbc34ba4d47768

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5eccefa2bacbc34ba4d47768

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