Unit 2-4 Flashcards
(5 cards)
1
Q
What is the function of pressure relief valves?
A
Protect the system from damage due to excessive pressure build-up
Release excess pressure to maintain a safe pressure level in the system
2
Q
What is the purpose of flow control devices
A
- Control direction of fluid flow
- Control the rate movement takes place
- Determine the sequence of movement
3
Q
What are check valves?
A
Permit flow in one direction using a ball valve
Diode of the hydraulic system
Hydraulic markings always include an arrow to show flow direction
4
Q
What are the 3 types of selector valves?
A
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
5
Q
What is the purpose of actuating devices?
What types of movement?
A
Convert fluid flow to mechanical motion
Linear (most common)
Rotary
