Descriptions of main parts of hydraulic circuits

1. By :-
Kanhaiya Atal (3M)
Roll no :- 34

2. • Component of Hydraulic circuit :-
1. Hydraulic Pump
2. Filter
3. Pressure Relief Valve
4. Check Valve
5. Hydraulic Reservoir (Tank)
6. Direction Control Valve
7. Hydraulic Cylinder

3. 1) Hydraulic Pump
• Oil is pumped from the hydraulic reservoir into the system.
• A fixed displacement pump is the simplest type and has a fixed output for each
revolution of the input shaft.
• Modifications to this symbol describe the variable displacement pump.

4. 2) Filter
• Filters clean oil entering the system, and are used in various places within a system.
• Return filters are common and filter oil returning to the reservoir.

5. 3) Pressure Relief Valve
• Relief valve or pressure relief valve (PRV) is a type of safety valve used to control or
limit the pressure.
• Pressure relief valve or PRV passes fluid from an area of higher pressure to a lower
pressure (typically the tank).

6. 4) Check Valve
• Check valve allows flow in one direction and automatically prevents back flow (reverse flow)
when fluid in the line reverses direction.
• Commonly used to hold pressure in a hydraulic cylinder.

7. 5) Hydraulic Reservoir
• Hydraulic systems all have a means of storing hydraulic fluid.
• Vented hydraulic reservoirs are common place, but sealed systems can be found ion
aerospace and marine applications.

8. 6) Direction Control Valve
• Hydraulic fluid flow is controlled by a
directional control valve .
• Commonly consists of four parts, valve
body, spool, actuator, and springs. The
spool is moved with respect to the valve
body, this opens and closes internal flow
galleries to control fluid flow.

17. 7) Cylinder
• Hydraulic cylinder or actuator uses hydraulic power to generate mechanical force.
• A double acting cylinder (above) has two ports and is therefore powered in and out.
Single acting cylinders have one port and would typically be used for lifting
applications.

18. Types of Hydraulic Circuit :-