Unit 2-4

Question 1

What is the function of pressure relief valves?

Answer 1

Protect the system from damage due to excessive pressure build-up
Release excess pressure to maintain a safe pressure level in the system

Question 2

What is the purpose of flow control devices

Answer 2

1. Control direction of fluid flow
2. Control the rate movement takes place
3. Determine the sequence of movement

Question 3

What are check valves?

Answer 3

Permit flow in one direction using a ball valve
Diode of the hydraulic system
Hydraulic markings always include an arrow to show flow direction

Question 4

What are the 3 types of selector valves?

Answer 4

4 way : used if flow is required to move actuators in two direction
3 way : used if flow is required to move in one direction
2 way : used to control flow on and off

Question 5

What is the purpose of actuating devices?

What types of movement?

Answer 5

Convert fluid flow to mechanical motion

Linear (most common)
Rotary