Hydraulics Flashcards
Hydraulic fluid does what 4 things
• Transmit power
• Cools parts
• lubes parts
• seals clearances
AW32 stands for?
Anti-wear 32 weight/viscosity
WR46 stands for?
Wear resistant 46 weight
EP32 stands for
Extreme pressure 32 weight
R&O stands for?
Rust & oxidation
The temperature where vapors ignite with an ignition source but does not sustain a flame
Flash point
The temperature at which the vapor can sustain a flame with an ignition source
Fire point
The temperature at which a fluid ignites with no ignition source needed
Auto ignition
Hydraulic fluid is typically made from 2 different types of bases
Water
Synthetic
Morg oil is what type of hydraulic fluid?
Invert emultion fluid
*phase separation is when the water separates from the oil due to excessive pressure.
Check valve around a flow control is known as what?
By-pass check
A check valve that will support a load
Pilot operated check
A check that prevents back flow from the pump
Backflow check
3 types of accumulators
•weighted
•spring
•hydro-pneumatic
Functions of an accumulator
•develope flow
•maintain pressure
•absorb shock
D03, D05, D07, D08, D010 All notate DCV mounting patterns and port sizes the larger the number the bigger the ports.
That’s it, I couldn’t think of a question.
4 ways to control a DCV
•Mechanically
•Manually
•Electrically
•Pilot
A center condition where A&B can flow back to tank and pressure is blocked.
Float
A center condition where all ports are blocked
Blocked
A center condition where all ports are open.
Open
A center position where pressure and tank are connected and A&B are blocked
Tandem
A symbol for hydropneumatic accumulator
Image attached
Symbol for weighted accumulator
Image attached
Symbol for spring accumulator
