DCVs working principle, Different types of DCVs, Advantages, and Disadvantages of DCV and Application

1. Chapter-IIB
Introduction
There are three types of valves:
1. Directional control valves (DCVs): They determine the path through which a fluid transverses a
given circuit.
2. Pressure control valves: They protect the system against overpressure, which may occur due to a
sudden surge as valves open or close or due to an increase in fluid demand.
3. Flow control valves: Shock absorbers are hydraulic devices designed to smooth out pressure
surges and to dampen hydraulic shock.
Classification of DCVs
Check
Valve

2. Shuttle
Valve

3. Two-Way Direction Control

4. 2/2-Way DCV (Normally Closed)

5. 2/2-Way DCV (Normally Opened)
Three-Way Direction Control
3/2-Way DCV (Normally Closed)

6. 3/2-Way DCV (Normally Opened)
Four-Way Direction Control Valves

7. PRESSURE-CONTROL VALVES
Introduction
Simple Pressure-Relief Valve

9. Pressure-Reducing Valve

12. Unloading Valves

15. Counterbalance Valve

17. Pressure Sequence Valve

20. FLOW-CONTROL VALVES