Module 7 Flashcards

1
Q

a valve that limits and regulates the pressure and controls the flow rates of fluid in a hydraulic system

A

Pressure-control valve

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2
Q

a valve that protects a hydraulic system against excess pressure by gradually opening to relieve pressure

A

Pressure-relief valve

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3
Q

a valve used when it is necessary to have one cylinder actuated either before or after another

A

Sequence valve

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4
Q

a valve used to support a hoisted load or to prevent uncontrolled fall

A

Counterbalance valve

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5
Q

a valve used to limit the pressure in one part of the system to below that of the main part of the system

A

Pressure-reducing valve

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6
Q

Do pressure-control valves have any partially open positions between fully closed and fully open?

A

Yes

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7
Q

Are pressure-relief valves normally open or normally closed?

A

Normally closed

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8
Q

Name the two general categories into which all relief valves can be divided.

A

Direct-acting, Pilot-operated

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9
Q

Direct-acting poppet relief valves are held in the normally closed position by a(n) _____.

A

Spring

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10
Q

The difference between the set (maximum) pressure point and the cracking-pressure point for a relief valve is called the _____.

A

Operating differential pressure

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11
Q

When a relief valve is controlled from a remote point, is the main valve usually a single-stage or a two-stage valve?

A

Two-stage

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12
Q

What type of valves are used when it is necessary to have one cylinder actuated either before or after another?

A

Sequence

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13
Q

An adjustable back-pressure or braking valve is usually called a(n) _____ valve.

A

Counterbalance

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14
Q

A valve that is similar to a counterbalance valve, but which offers less resistance to return flow, is a(n) _____.

A

Holding

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15
Q

Unloading valves are commonly used in hydraulic systems that have more than one _____.

A

Pump

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16
Q

Is a pressure-reducing valve used to limit the pressure in one part of the system only or in the entire system?

A

One part

17
Q

Hydraulic shock in a system is usually controlled by a(n) _____.

A

Shock suppressor

18
Q

The speed at which an actuator moves is determined by the amount of _____.

A

Fluid flow

19
Q

Name the three ways in which a flow-control valve can operate.

A

Meter in, Meter out, Bleedoff

20
Q

A pressure-compensation valve is controlled by pressure on the _____ side of the valve.

A

Downstream

21
Q

Temperature-compensation valves are usually equipped with an element that _____ as the temperature rises.

A

Expands

22
Q

A pressure-reducing valve is a normally _____ valve.

a. closed three-way
b. closed two-way
c. open three-way
d. open two-way

A

d. Open two-way

23
Q

What is another term for the maximum pressure of a poppet relief valve?

a. Cracking pressure
b. Flow capacity
c. Operating differential pressure
c. Set pressure

A

d. Set pressure

24
Q

What is the pressure at the discharge (outlet) of a sequence valve?

a. cracking pressure
b. Line pressure
c. Negative pressure
d. Set pressure

A

b. Line pressure

25
Q

A counterbalance valve is usually constructed as a

a. double poppet
b. double spool
c. single poppet
d. single spool

A

a. Double poppet

26
Q

Unloading valves are usually made for _____ operation.

a. direct-acting
b. manual
c. pilot
d. presssure

A

c. Pilot

27
Q

Pressure-reducing valves limit pressure

a. at the pump
b. in one part of the system
c. in two separate parts of the system
d. throughout the entire system

A

b. In one part of the system

28
Q

Hydraulic shock in a system is controlled by a(n)

a. adjustable orifice
b. counterbalance valve
c. shock suppressor
d. unloading valve

A

c. Shock suppressor

29
Q

The speed of a hydraulic actuator is controlled by what characteristic of the hydraulic system?

a. Flow
b. Pressure
c. Temperature
d. Viscosity

A

a. Flow

30
Q

A flow-control valve can be positioned to operate in all of the following ways except

a. bleedoff
b. counterbalance
c. meter in
d. meter out

A

b. Counterbalance

31
Q

A pressure-compensation valve senses pressure at the

a. downstream valve outlet
b. pump
c. reservoir
d. valve inlet

A

a. Downstream valve outlet