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Hydraulics > Midterm > Flashcards

Midterm Flashcards

0
Q

Description of DCV

A

Number of blocks are positions

Number of lines are ways

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1
Q

Formula of Pressure

A

Force over area

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2
Q

Unbalanced came pump

A

Circular chamber and adjustable

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3
Q

Balanced vane pump

A

Egg shaped and not adjustable

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4
Q

Displacement of pump

A

Affects the velocity of the piston in the cylinder

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5
Q

Vane pumps

A

Doesn’t tolerate containaments
Low to med displacement
Low pressure resistance

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6
Q

Piston pumps

A

Most efficient volumetric flow

Typical odd number of cylinders

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7
Q

Variable swash plate piston pump

A

Allows adjustment of displacement

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8
Q

Reservoirs

A

General designs have 1/3 to 1/2 of fluid in system

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9
Q

P and T

A

Pressurized fluid and tank fluid

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10
Q

DCV

A

Named after design and features

They direct and exclude flow

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11
Q

PRV setting

A

Set 10% higher than max operating pressure

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12
Q

Extension formula

A

Area piston x stroke

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13
Q

Hp formula

A

Prel x Del x .000583

Divide by V.E.

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14
Q

Inlet velocity

A

2 to 5 ft/sec

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15
Q

Working velocity

A

7 to 20 ft/sec

16
Q

Working diameter

A

Square root of (del x .3208) / ( vel x .7854)

17
Q

Inlet diameter

A

Square root of (del/v.e x .3208) / (vel x .7854)

18
Q

Delivery formula

A

Supply rate x 1/231

19
Q

Designing regenerative circuits

A

Should only base calc on annulus area

20
Q

Telescoping cylinders

A

Speed up as it extends

21
Q

Multiple piston cylinders

A

2 Pistons attached to one rod

22
Q

Most common check valves

A

Ball and poppet

23
Q

Fluid cushion

A

Used for big and high velocity app that slows it down for no metal to metal contact

24
Q

Shunt

A

Exhaust for fluid that uses check valve

25
Q

Open center valve

A

Used to conserve energy

26
Q

Tandem center DCV

A

Allows pressure to be held in system while you conserve energy

Hydraulics (1 decks)

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