Hydraulics - Seafish

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Segment One - Basic Hydraulic Systems Welcome to the first segment in this Module in which we will see what a hydraulic system is composed of. AIMS OF THE SEGMENT The main aim of this segment is to help you to achieve Objectives No. 1 and No. 2 given on page xiii. For this you should be able to: • State the principal components of a hydraulic system. • State the purpose of each component. • Describe the basic actions of pumps, valves and actuators. HYDRAULIC SYSTEMS A hydraulic system is a system which uses hydraulic fluid (usually oil) to produce motion or power at some distance from the source of power and the person controlling it. For example, it can produce motion or power on deck from a pump in the engine room. All hydraulic systems have the same general layout. There are 4 basic components: • A tank (reservoir) to hold the fluid. • A pump to force the fluid through the system. • Valves to control the pressure, direction and flow of the fluid. • An actuator (a cylinder or motor) to convert the energy of the fluid into mechanical force and produce power. Two simple hydraulic systems are shown in Figures 1 and 2. <strong>Seafish</strong> Open Learning
Working cylinder V 7 3 •< ► Load . Directional control valve Pressure gauge, Engine Drive or Electirc Motor- \f p ^ \ ^ I . Fluid conductor Relief valve -Filter breather .Return line fitter I _ Oil level and temperature indicator \Suction strainer Figure 1. Filler breather cap low pressure flexible coupling orveebelt drive Figure 2. <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 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 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
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45 K4SS^^ LINES AND LINE FUNCTIONS
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47 PUMP ONE-WAY VARIABLE OUTPUT PUM
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49 • Pilot pressure means that oi
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51 ® A reversible motor with a bra
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53 (?) SAQ15 Using the information
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55 First, identify each of the item
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57 ® SAQ28 Using the diagram of Fi
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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
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Other modules in this series which
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Hydraulics - Seafish

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