23 - Eat 8

Question 1

Directional valves control the _________ of fluid flow. A) Direction B) Pressure C) Blocking D) Reducing

Answer 1

A) Direction pg 185

Question 2

Directional valves that shift to definite positions are sometimes referred to as _____ positioning valves. A) Coarse B) Finite C) Six-way D) Vacuum

Answer 2

B) Finite pg 185

Question 3

A simple ____ valve permits fluid flow in one direction and blocks flow in the reverse direction A) Spool B) Compound C) Check D) Vacuum

Answer 3

C) Check pg 186

Question 4

Check valves containing heavier springs than a nominal 5 PSI are often used as simple ______ valves. A) Relief B) Globe C) Radial D) Spool

Answer 4

A) Relief

Question 5

Directional valves are used to reverese a cylinder or motor are usually ____ valves. A) One way B) Two way C) Three way D) Four way

Answer 5

D) Four Way pg 191

Question 6

Directional control valves may be shifted? A) Mechanically B) Electrically C) Hydraulically D) All of the above

Answer 6

"D) all of the above                                     Note: (pg. 196,197 & 198, 5 operator types)
●Manually
●Mechanically
●Pneumatically
●Hydraulicly
●Electrically"

Question 7

A solenoid operated spring off-set valve has finite positions. A) One B) Two C) Four D) Six

Answer 7

B) Two pg 198

Question 8

An integral part of a prefill valve that prevents hydraulic shock is a ______. A) Decompression valve B) Pilot choke C) Adjustable orifice D) Stroke limiter

Answer 8

A) Decompression valve pg 196

Question 9

Pilot pressure for a solenoid controlled pilot operated directional valve may be supplied ______. A) Internally B) Externally C) Manually D) Both A and B

Answer 9

D) Both A and B pg 201

Question 10

The device that can be added to a solenoid controlled pilot operated valve to control the rate of main spool shift is called a(n) ______. A) Open choke B) Pilot choke C) Valve controller D) Oil controller

Answer 10

B) Pilot Choke pg 204

Question 11

When large valve spools are shifted hydraulically, pilot pistons are sometimes used to obain _____ shift times. A) Faster B) Slower C) Medium D) All of the above

Answer 11

A) Faster pg 205

Question 12

The adjustable-orifice deceleration valve provides an external adjustment to utilize full spool travel regardless of _______ through the valve A) Pressure rate B) Power rate C) Flow rate D) All of the above

Answer 12

C) Flow Rate pg 208

Question 13

A simple kind of flow control that restricts the distance a spool can shift is a _____. A) Spool option B) Spool stop C) Stroke limiter D) Stroke chock

Answer 13

C) Stroke limiter pg 206

Question 14

Line-mounted directional spool valves are more frequently found in ____ application. A) Industrial B) European C) ISO D) Mobile

Answer 14

D) Mobile pg 206

Question 15

The graphic diagram below is for a 2 position, 4 way control valve. True or False

Answer 15

FALSE The valve is a 3 position, 4 way control valve This graphic contains: 3 Envelopes (boxes) -each envelope (box) = 1 position
2 sets of arrows -each set has in/out = 2 ways each, 2 sets=4 ways total

Question 16

At which flow rate does a tapered plunger design valve lose control? A) Low B) High C) Free D) Reverse

Answer 16

A) Low pg 208

Question 17

The type of valve that allows load creep is a __________ valve. A) Window orifice B) Tapered plunger C) Rotary cap D) Free interlock

Answer 17

A) Window orifice pg 208

Question 18

A valve that slows a drill head form fast advance to feed speed is a __________ valve. A) Rotary B) Limiter C) Deceleration D) Two-stage

Answer 18

C) Deceleration

Question 19

Valves that use atmospheric pressure to push large volumes of fluid through them are _______ valves. A) Direct-acting B) Return C) Neutral D) Prefill

Answer 19

D) Prefill pg 209

Question 20

Which of the following is not an actuator category? A) Electrical B) Directional C) Pneumatic D) Manual

Answer 20

"B) Directional                                          Note: (pg. 196, 197 & 198, 5 actuator types)
●Manually
●Mechanically
●Pneumatically
●Hydraulicly
●Electrically"