Valves – Butterfly, Diaphram, Screw-Down, 3 way, Globe
(a) State, with reasons, the type of valve that should be fitted to EACH of the following:
(i) main engine lubricating oil pump delivery;(2)
(ii) fuel service tank outlet;(2)
(iii) Ballast tank.(2)
(b) State the information required to correctly order a replacement valve.(4)
2. Quiz. Study Notes
State, with reasons, a suitable application for EACH of the following types of valve:
(a) butterfly;(2)
(b) diaphragm;(2)
(c) screw-down, non-return;(2)
(d) 3-way;(2)
(e) quick closing, screw lift.(2)
3. Quiz. Study Notes
With reference to ship’s side valves:
(a) state why grey cast iron is not a suitable material;(3)
(b) state, with reasons, TWO suitable materials;(2)
(c) state the regular maintenance that the valves should receive, outlining reasons for this maintenance.(5)
(a) Sketch a section through a bilge injection (emergency bilge) valve.(8)
(b) Describe how the valve sketched in part (a) is tested.(2)
4. Quiz. Study Notes
(a) Sketch a cross-section of a relief valve suitable for use with a fuel supply pump(6)
(b) Describe the operation of the valve sketched in part (a) (4)
5. Quiz. Study Notes
(a) Sketch a globe type screw lift valve suitable for sea water service.(7)
(b) State, with reasons, the materials used for the valve sketched in part (a).(3)
6. Quiz. Study Notes
(a) Sketch a flexible diaphragm valve. (6)
(b) Describe how the diaphragm is replaced, stating the precautions that should be taken. (4)
7. Quiz. Study Notes
(a) Sketch a section through a 3-way mixer valve.(8)
(b) State an application for this type of valve.(2)
8. Quiz. Study Notes