Hydraulics - Seafish

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21 Port A I I Port B Rudder angle port Rudder angle starboard Rotary vane (3) Figure 33(b) Rotary Vane Actuator (High Pressure) In each case the flow of oil is determined by a directional control valve which directs oil to either port A or port B. To complete this segment try these SAQ's. ® SAQ16 State the differences in action of a linear actuator, a rotary actuator and a semi-rotary actuator. Seaf ish Open Learning
22 Which types of pumps can be used as a hydraulic motor? SUMMARY You have now completed Segment One in which the aims were that you should now be able to: • State the principal components of a hydraulic system; • State the purposes of the components; • Describe the basic actions of pumps, valves and actuators. If you have completed and checked the responses to all the SAQ's you will have also achieved Objectives No. 1 and No. 2 given on page xiii. Well done! This has been a long segment and may be a new form of study for you. Take a well earned break before starting Segment Two. In the meantime remember to look at the hydraulic systems on your vessel if an opportunity presents itself. <strong>Seafish</strong> Open Learning
Page 1 and 2: SEA FISH INDUSTRY AUTHORITY Hydraul
Page 3 and 4: Hydraulics in Fishing Vessels An Op
Page 5 and 6: SEGMENT FIVE - HYDRAULIC OILS AND F
Page 7 and 8: A Guide for Open Learners This will
Page 9 and 10: VII S.A.Q/S are shown by a box with
Page 11 and 12: IX • Time spent just reading a mo
Page 13: XIII Objectives After completing th
Page 17 and 18: Working cylinder V 7 3 •< ► Loa
Page 19 and 20: Write down a list of the main compo
Page 21 and 22: In this type the rotor shaft is off
Page 23 and 24: 8 Pressure Control Valves Positive
Page 25 and 26: 10 Relief valves are either pre-set
Page 27 and 28: 12 (A) From Pump (P) i a(B) Raise H
Page 29 and 30: 14 Out Out Globe valve Figure 17. S
Page 31 and 32: 16 (?) SAQ25 Explain how a relief v
Page 33 and 34: 18 The cylinders shown in Figures 2
Page 35: 20 Figure. 31. Figure 32. Port A Po
Page 41 and 42: 24 Hydraulic Pressure The pressure
Page 43 and 44: 26 In order to help you to compare
Page 45 and 46: 28 ® SAQ18 Using Figure 35 on page
Page 47: 30 ® SAQ29 When a hydraulic motor
Page 51 and 52: 32 Rotor Inlet External Gear Pump F
Page 53 and 54: 34 The vanes are pushed out by cent
Page 55 and 56: 36 Piston Pumps All piston pumps de
Page 57 and 58: 38 Drive shaft flange Piston Yoke c
Page 59 and 60: 40 Eccentric Oil outlet Figure 49.
Page 63 and 64: 43 Segment Four — Hydraulic Syste
Page 65 and 66: 45 K4SS^^ LINES AND LINE FUNCTIONS
Page 67 and 68: 47 PUMP ONE-WAY VARIABLE OUTPUT PUM
Page 69 and 70: 49 • Pilot pressure means that oi
Page 71 and 72: 51 ® A reversible motor with a bra
Page 73 and 74: 53 (?) SAQ15 Using the information
Page 75 and 76: 55 First, identify each of the item
Page 77 and 78: 57 ® SAQ28 Using the diagram of Fi
Page 79: 59 SUMMARY You have now completed S
Page 83 and 84: 62 PROPERTIES OF HYDRAULIC OILS The
Page 85 and 86: 64 (2) SAQ20 How is the viscosity o
Page 87 and 88:
66 (?) SAQ26 Using Table 3 determin
Page 89 and 90:
68 Additives in Hydraulic Oils Many
Page 91 and 92:
70 CONTAMINATION Dirt and other for
Page 93 and 94:
72 • Metal wear particles • Pac
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74 Full flow filters are all fitted
Page 99 and 100:
77 Segment Six — Maintenance and
Page 101 and 102:
79 Cleanliness has top priority.
Page 103 and 104:
81 Do not 'grip' a hot pipe. Try a
Page 105 and 106:
83 Faulty Seals Faulty Seals on pum
Page 107 and 108:
85 Excessive Noise Table 4 Seafish
Page 109 and 110:
87 Incorrect Flow Table 6 Seafish O
Page 111 and 112:
89 Faulty Operation Table 8 Seafish
Page 113 and 114:
93 So you can see that there are ma
Page 117 and 118:
95 Responses to the Self Assessment
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97 SAQ 6 Did you show the change in
Page 121 and 122:
99 SAQ9 The various properties whic
Page 123 and 124:
101 SAQ15 SAQ16 A linear actuator p
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103 SAQ20 (a) Viscosity increases a
Page 127 and 128:
105 SAQ26 SAE 20W/30 oil will have
Page 129 and 130:
Other modules in this series which
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Hydraulics - Seafish

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