1. Fluid Power Control

2. Module:03 ~ Hydraulic SYSTEM COMPONENTS
FLUID POWER
Module:03 ~ Hydraulic SYSTEM COMPONENTS
Sources of Hydraulic Power
Construction and working of pumps – Variable
displacement pumps
Actuators:
Hydraulic cylinders, performing linear motion
Hydraulic motors, performing continuous rotary motion
Hydraulic rotary actuators, performing limited angular
Control Components:
Pressure Control Valve
Direction control valve
Flow control valves

3. FLUID POWER
Control Components:
Flow Control Valve

4. Control Components: FCV Functions of Flow-Control Valves:
FLUID POWER
Control Components:
FCV
Functions of Flow-Control Valves:
Regulate the speed of linear and rotary actuators.
Regulate the power available to the sub-circuits by controlling the flow to them.
Proportionally divide or regulate the pump flow to various branches of the circuit

5. FLUID POWER
Control Components:
FCV
Operation Principle:

6. Control Components: FCV Factors that determine flow rate:
FLUID POWER
Control Components:
FCV
Factors that determine flow rate:
Cross-sectional area of orifice.
Shape of the orifice (round, square or triangular).
Length of the restriction.
Pressure difference across the orifice (Δp).
Viscosity of the fluid.

7. Control Components: FCV Operation Principle: FLUID POWER 4 LPM 6 LPM

8. Control Components: FCV Operation Principle: FLUID POWER 4 LPM 6 LPM

9. 1. Non-pressure compensated 2. Pressure compensated
FLUID POWER
Control Components:
FCV
CLASSIFICATION:
1. Non-pressure compensated
2. Pressure compensated

10. Control Components: FCV Non-pressure compensated Needle Valve:
FLUID POWER
Non-pressure compensated
Needle Valve:

11. FLUID POWER
Control Components:
FCV

12. Pressure Compensated FCV
Control Components:
FLUID POWER
FCV
Pressure Compensated
Pressure Compensated FCV

13. Meter – in Circuit Control Components: FCV SPEED CONTROLLING CIRCUIT:
FLUID POWER
Control Components:
FCV
SPEED CONTROLLING CIRCUIT:
Meter – in
Circuit

14. Meter – out Circuit Control Components: FCV SPEED CONTROLLING CIRCUIT:
FLUID POWER
Control Components:
FCV
SPEED CONTROLLING CIRCUIT:
Meter – out
Circuit

15. Bleed – off Circuit Control Components: FCV SPEED CONTROLLING CIRCUIT:
FLUID POWER
Control Components:
FCV
SPEED CONTROLLING CIRCUIT:
Bleed – off
Circuit

16. Control Components: FCV Problem: 1
FLUID POWER
Control Components:
FCV
SPEED CONTROLLING CIRCUIT:
Problem: 1
A 55-mm diameter sharp-edged orifice is placed in a pipeline to measure the flow rate. If the measured pressure drop is 300 kPa and the fluid specific gravity is 0.90, find the flow rate in units of m3/s.
Q in LPM,
C = Flow coefficient
= 0.80 for the sharp-edge orifice, = 0.6 for a square-edged orifice,
A in mm2,
Pressure drop in kPa

17. Control Components: FCV SPEED CONTROLLING CIRCUIT: FLUID POWER
Problem: 2
The system shown in figure has a hydraulic cylinder with a suspended load W. The cylinder piston and rod diameters are 50.8 and 25.4 mm, respectively. The pressure-relief valve setting is 5150 kPa. Determine the pressure p2 for a constant cylinder speed:
(a) W = 8890 N
(b) W = 0 ( load is removed)
(c) Determine the cylinder speeds for parts (a) and (b) if the flow-control valve has a capacity coefficient of The fluid is hydraulic oil with a specific gravity of 0.90.
ANS: kPa, 6880 kPa , m/s , m/s

18. Control Components: FCV SPEED CONTROLLING CIRCUIT: FLUID POWER
Problem: 3
The system shown in figure has a hydraulic cylinder with a suspended load W. The cylinder piston and rod diameters are 50.8 and 25.4 mm, respectively. The pressure-relief valve setting is 5150 kPa. Determine the pressure p2 for a constant cylinder speed:
(a) W = 8890 N
(b) W = 0 ( load is removed)
(c) Determine the cylinder speeds for parts (a) and (b) if the flow-control valve has a capacity coefficient of The fluid is hydraulic oil with a specific gravity of 0.90.
ANS: kPa, 6880 kPa , m/s , m/s