2ND 23 Flashcards
Directional valves control the ______ of fluid flow.
a) Direction
b) Pressure
c) Blocking
d) Reducing
a) Direction
Directional valves that shift to definite positions are sometimes referred to as ______ positioning valves.
a) Coarse
b) Finite
c) Six-way
d) Vacuum
b) Finite
A simple ______ valve permits fluid flow in one direction and blocks flow in the reverse direction.
a) Spool
b) Compound
c) Check
d) Vacuum
c) Check
Check valves containing heavier springs than a nominal 5 PSI are often used as simple ______ valves.
a) Relief
b) Globe
c) Radial
d) Spool
a) Relief
Directional valves are used to reverse a cylinder or motor are usually _______ _______ valves.
a) One way
b) Two way
c) Three way
d) Four way
d) Four way
Directional control valves may be shifted ________.
a) Mechanically
b) Electrically
c) Hydraulically
d) All of the above
d) All of the above
A solenoid operated spring-offset valve has ____ finite positions.
a) One
b) Two
c) Four
d) Six
b) Two
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
a) Decompression valve
Pilot pressure for a solenoid controlled pilot operated directional valve may be supplied _______.
a) Internally
b) Externally
c) Manually
d) Both A and B
d) Both A and B
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
b) Pilot choke
When large valve spools are shifted hydraulically, pilot pistons are sometimes used to obtain ______ shift times.
a) Faster
b) Slower
c) Medium
d) All of the above
a) Faster
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
c) Flow rate
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 choke
c) Stroke limiter
Line-mounted directional spool valves are more frequently found in _________ applications.
a) Industrial
b) European
c) ISO
d) Mobile
d) Mobile
Draw the graphic symbol for a: 2 position 4 way control valve.
2 Position = 2 Envelops
4 Way = 4 Arrows
2 Position = 2 Envelops
4 Way = 4 Arrows
