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Fluid Power Personal > Hudrolic Fluid, Check Valves, Accumulators, DCVs > Flashcards

Hudrolic Fluid, Check Valves, Accumulators, DCVs Flashcards

1
Q

What four things does hydraulic fluid do?

A

Transmits power
Lubricants moving parts
Cools moving parts
Seals clearances

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2
Q

What is viscosity

A

Thickness of a fluid

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3
Q

What does WR stand for in hydraulic fluid additives.

A

Wear resistant.

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4
Q

AW stands for?

A

Anti wear

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5
Q

EP stands for?

A

extreme pressure

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6
Q

R and O stands for?

A

Rust and oxidation

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7
Q

What are the four additives for hydraulic fluid?

A

WR (water resistant)
AW (anti wear)
EP (extreme pressure)
R and O (rust and oxidation)

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8
Q

When is hydraulic fluid most dangerous?

A

When atomized into atmosphere

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9
Q

What is flash point?

A

Temperature fluid must be heated to give off vapor to ignite

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10
Q

What is fire point?

A

Temperature with fluid burns and stays lit

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11
Q

Auto ignition is what?

A

Temperature fluid ignites without flame or spark

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12
Q

Two types of fire resistant fluids are?

A

Water based
Synthetic

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13
Q

What is invert emulsion?

A

Creamy white liquid made up of 60% oil 40% water

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14
Q

Why do you have to drain water from a tank containing hydraulic fluid?

A

Phase separation.
Emulsifiers break down and the water separates from oil

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15
Q

What does a emulsifier do?

A

Holds water in the oil.

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16
Q

What does a check valve do?

A

Allows flow in one direction

17
Q

What kind of check valve for flow control?

A

Bypass check valve

18
Q

When used to isolate you use what type of check valve?

A

Back flow check valve

19
Q

What type of check valve when suspending a load and allows back flow through the system?

A

Pilot operated check valve

20
Q

What are the three types of accumulators?

A

Weight loaded
Spring loaded
Hydro - pneumatic

21
Q

What kind of gas do we use with a hydro - pneumatic accumulator?

A

Nitrogen

22
Q

What three things do we use accumulators for?

A

Maintain pressure
Develop flow
Protect against shock

23
Q

Four ways a dcv is controlled?

A

Manually
Mechanically
Electrically
Pilot pressure

24
Q

Four centers on hydraulic dcvs?

A

Float center (A,B,T)
Tandem center (P,T)
Blocked (none)
Open (all)

25
Q

DCV mounting patterns?

A

D03
D05
D07
D08
D10

Fluid Power Personal (6 decks)

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