Hydraulics - Seafish

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15 (?) SAQ14 Sketch in the spool valve on this diagram and show how the spool valve directs the flow of oil to: (use a soft pencil) a) Port A b) Port B <strong>Seafish</strong> Open Learning
16 (?) SAQ25 Explain how a relief valve controls high pressure in a pipe line. Take a short break at this point before studying the next part. Actuators This is the "business end' of the hydraulic system, namely, where the work is done! An actuator can take a number of different forms but in general: An actuator is any device that converts hydraulic pressure into mechanical work. Cylinders (Linear Actuators) The cylinder on your power block probably looks like Figure 20. Oil Inlet 7* Ram Load Figure 20. Seaf ish 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: 14 Out Out Globe valve Figure 17. S
Page 33 and 34: 18 The cylinders shown in Figures 2
Page 35 and 36: 20 Figure. 31. Figure 32. Port A Po
Page 37: 22 Which types of pumps can be used
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
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62 PROPERTIES OF HYDRAULIC OILS The
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64 (2) SAQ20 How is the viscosity o
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66 (?) SAQ26 Using Table 3 determin
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68 Additives in Hydraulic Oils Many
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70 CONTAMINATION Dirt and other for
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72 • Metal wear particles • Pac
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74 Full flow filters are all fitted
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77 Segment Six — Maintenance and
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79 Cleanliness has top priority.
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81 Do not 'grip' a hot pipe. Try a
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83 Faulty Seals Faulty Seals on pum
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85 Excessive Noise Table 4 Seafish
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87 Incorrect Flow Table 6 Seafish O
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89 Faulty Operation Table 8 Seafish
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93 So you can see that there are ma
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95 Responses to the Self Assessment
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97 SAQ 6 Did you show the change in
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99 SAQ9 The various properties whic
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101 SAQ15 SAQ16 A linear actuator p
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103 SAQ20 (a) Viscosity increases a
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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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