UNIT-3- Hydraulic Circuits and Control

1. HYDRAULIC COMPONENTS
Presented By :
Prof.S.Sathishkumar
Assistant Professor
Department of Mechanical Engineering
Vel Tech Engineering College
Avadi-Chennai
Email- sathishkumar@veltechengg.com

2. Hydraulic Components
Reservoirs
Accumulators
Pumps
Valves
Actuators
Conductors

3. Hydraulic Components
Accumulator Functions
Energy Storage
Stabilize Pump Pulsation
Stabilize Load Shocks
StoreVolumeUnderPressure For High Volume
Demands

4. Hydraulic Components
Accumulator Types
Spring Loaded
Gas Charged (Nitrogen)
Weight Loaded
Hydraulic Counter Loaded

5. Accumulator Types
Spring Loaded Types
Sealed Piston
Piston may be sealed with an O-ring,
quad ring, or square ring and may even
be backed up with a Teflon cushion
washer depending on pressure
requirements of system and spring
strength

6. Accumulator Types
Spring Loaded Types
Sealed Piston
Compound Spring
This accumulator system is often used for
variable loads or independent pressure volumes
for light load extensions in sequential operation.

7. Accumulator Types
Spring Loaded Types
Sealed Piston
Compound Spring
Diaphragm
The sprung side may be pneumatically boosted

8. Accumulator Types
Spring Loaded Types
Sealed Piston
Compound Spring
Diaphragm
Hydraulic Counter Loaded
Notice: 2 different size pistons allowing for mechanical advantage boosting that are balanced by 2 springs
working against each other (learn the math!!)

9. Accumulator Types
Spring Loaded Types
Sealed Piston
Compound Spring
Diaphragm
Hydraulic Counter Loaded
Spring with Bellows

10. Review Spring Types
Spring Loaded Types
Sealed Piston
Compound Spring
Diaphragm
Hydraulic Counter Loaded
Spring with Bellows

11. Hydraulic Components
Accumulator Types
Spring Loaded
Gas Charged (Nitrogen)
Weight Loaded
Hydraulic Counter Loaded

12. Accumulator Types
Gas Charged Types
Bladder Type
Diaphragm Type
Sealed Piston Type
Metal Bellows Type
Usually Nitrogen (Nuetral)

13. Accumulator Types
Gas Charged Types

14. Accumulator Types
Gas Charged Types

16. Accumulator Components