IMT-131 > Chapter 6 Review > Flashcards

Chapter 6 Review Flashcards

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1
Q

In a directional control valve, port _____ receives fluid flow from the pump, while port ____ returns fluid flow to the reservoir.

A

P; T

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2
Q

A(n) _____-center position directional control valve allows a hydraulic system to operate with more than one actuator and with each actuator operating independently of the others.

A

closed

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3
Q

A(n) ____ is an internal component of a directional control valve that is used to control fluid flow and to connect internal passages and ports.

A

spool

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4
Q

There are ___ different subplate designs.

A

seven

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5
Q

A(n) ______-center position directional control valve is used to hold the piston in a cylinder in the desired position while allowing fluid flow to be directed back to the reservoir without the need to activate a relief valve.

A

tandem

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6
Q

______ mounting is a method that uses tubing or threaded pipes that connect directly to a directional control valve.

A

In-line

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7
Q

A directional control valve ____ is a mechanism that is used to move the position of the spool in a directional control valve.

A

actuator

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8
Q

Solenoids alone are not strong enough to move a directional control valve spool when fluid flow is greater than _____ gpm.

A

25

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9
Q

In a directional control valve schematic symbol, ______ the position boxes depict the direction of fluid flow for each school position

A

internal arrows inside

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10
Q

A hydraulic system that does not have a variable-displacement, pressure-compensated pump typically uses a _____-center or _____-center position directional control valve so that the hydraulic fluid can be returned to the reservoir

A

open; tandem

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11
Q

_______ pressure is the amount of pressure required to slightly unseat a ball or poppet and start to allow fluid flow through a check valve

A

Crackling

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12
Q

A ______ is the direction in which a spool forces fluid to flow

A

Position

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13
Q

_______ pressure is initiated when the fluid pressure and a fluid power system shifts the spool into its desired position

A

Pilot

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14
Q

A _______ check valve allows, fluid flow in one direction and restricts fluid flow in the opposite direction until it receives a pressure signal through a pilot line applied to the port against the piston.

A

Pilot-to-open

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15
Q

The advantage of a three position, four-way directional control valve is that it has ______ different center positions that can perform _____ different operations

A

Four; four

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16
Q

A _____ valve allows or prevents fluid flow to specific piping or system actuators.

A

Directional control

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17
Q

A _____ sub plate can be used to mount multiple directional control valves of the same configuration.

A

Manifold

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18
Q

A ____ is an actuator that is used to hold a directional control valve spool in selected positions

A

Detent

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19
Q

A _____ is the section of a directional control valve that connects a pipe, hose, or tube to the internal passages of the directional control valve

A

Port

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20
Q

_____ logic valves have two inputs and a single output

A

AND

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21
Q

A _____ valve allows fluid flow from the pump port to an actuator port in the spring actuated (normal) position

A

Normally open (NO)

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22
Q

A shape symbol within the schematic symbol of a directional control valve is used to represent a(n) _______

A

Blocked port

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23
Q

In a _____-center position directional control valve, the cylinder cannot move because there is no fluid flow to or from the cylinder.

A

Closed

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24
Q

Directional control valve actuators are characterized as ____ and _____

A

Manual; automated

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25
Right angle check valves are available with a range of flow rates up to _____ gpm
400
26
______ mounting is a mounting method where a directional control valve is mounted to a subplate that attaches to system piping
Subplate
27
The ______-center position is used to hold a cylinder in a stable position while fluid flows back to the reservoir from the pump under low pressure
Tandem
28
A _____ is a solid-state controlled device that can be programmed and reprogrammed to automatically control electrical systems and commercial and industrial facilities
PLC
29
A _____ valve is a combination valve that consists of a small solenoid, actuated directional control valve that is used to control the main pilot-operated valve
Piggyback
30
A _____ check valve is directly activated or moved by fluid flow from a primary port
Direct-acting
31
A _____ valve allows fluid flow in one direction and stops fluid flow in the opposite direction
Check
32
A _____ is a symbol that represents the number of different positions that the spool in a directional control valve is capable of moving into.
Position box
33
______ symbols are used to indicate the type of directional control valve actuator, and the type of spool positioning method where applicable.
Schematic
34
A _________ is an electrical control device that converts electrical energy into linear mechanical energy when current passes through a magnetic coil located in the device
Solenoid
35
A _____ valve has its inlet and outlet ports set at a right angle to each other
Right angle check
36
T or F: Two-position, two-way directional control valves can turn on and off separate components of systems that are powered by the same hydraulic power unit
True
37
T or F: Most directional control valves used in industrial applications have two, three, or four positions, but some can have five or six
True
38
T or F: Every manufacturer has a different coding system used for ordering their directional control valves
True
39
T or F: Three-position, four way directional control valves can only control one direction of fluid flow at a time
False
40
T or F: Internal arrows on a hydraulic schematic diagram can be either colored solid or outlined
False
41
T or F: On a three-position directional control valve, both sides of the spool have springs to center the spool for normal condition
True
42
T or F: An AND logic valve allows fluid flow out of the valve when pressure is present on input 1 and input 2
True
43
T or F: A shuttle valve is also known as an AND logic valve
False
44
T or F: Right angle check valves are installed mainly in hydraulic systems, rather than pneumatic systems
True
45
T or F: A shuttle valve operates differently than an OR logic valve
False
46
T or F: Pilot-pressure actuators are used when electronic control of a hydraulic system is desired
False
47
T or F: On schematic diagrams, pilot lines are indicated by dashed lines
True
48
T or F: Open-center position directional control valves are typically used in applications where there is only one cylinder in the hydraulic system
True
49
T or F: Pilot pressure does not require electrical, mechanical, or manual actuation
True
50
T or F: A position is the number of piping ports in a directional control valve
False
51
T or F: Solenoid-actuated directional control valves are always double-solenoid actuated
False
52
T or F: A shuttle valve is a type of logic valve
True
53
T or F: Newly installed directional control valves typically have a schematic symbol printed or embossed on the valve body
True
54
T or F: The pressure point at which an automatic detent releases can be fixed or variable
True
55
T or F: Directional control valve actuators can be automated or manual, but never a combination of both
False
56
T or F: The spring pressure of the biasing spring in a direct-acting check valve is adjustable
False
57
T or F: When a directional control valve is in the closed-center or tandem-center position, the piston in a hydraulic cylinder can move
False
58
T or F: Two-position, two-way directional control valves are always normally closed (NC)
False
59
T or F: Two- and three-way directional control valves only control one direction of fluid flow at a time
True
60
T or F: Manifold sub plates reduce the amount of space and piping that a hydraulic system requires
True
61
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IMT-131
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