VALVES
Q1. Identify different types of valves. (Workshop)
Q2. What do you understand by
non-return valve?
Ans:
The Non-Return valve gives on way flow.
Q3. What will happen if valve is
not closing properly?
Ans:
Flow will not stop
Q4. State the importance of valve
maintenance?
Ans:
all valve should be operate easily.
Q5. State precaution to be taken during
valve maintenance.
Ans:
1)
Pipe
line should be depressurized first.
2)
New
gasket and gland packing should be used.
3)
Put
notice from where system is started.
Q6. What will you do on finding
leaky gland on a valve?
Ans:
Both nut of the gland are to be tightened equally to stop leakage. If leakage
is not stopped renew the gland packing.
Q7.
What are the different types of valves used on board ship?
Ans:
Globe valve, Butterfly valve, Gate valve, Angle valve, Ball type valve, Swing
check valve, Safety valve, Relief valve, Quick closing valve, Pressure reducing
valve.
Q8. What is the use of check valve?
Ans:
Check valve is used to prevent the back flow of liquid.
Q9. What is the use of Quick
closing valve?
Ans:
QCV is fitted on fuel oil and lube oil tanks. It is operated from outside the
engine room from remote location in case of emergency.
Q10. Why maintenance you will carry
out on Globe valve SDNR type.
ANS:
normally we are looking for the smooth operation of the valve so the following
maintenance will carry out.
1) Renew
the gasket
2) Renew
the gland packing
3) Carry
out lapping
Q11. Which type of valve is used in
bilge line?
Ans:
Screw down non return valve
Q12. Which type of valve is used in
ballast system?
ANS:
Butter fly valve and gate valve
Q13. What is the purpose of
pressure reducing valve.
Ans:
It is used to reduce the pressure from high to low by setting the spring
tension.
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