Based on the circuit shown in Figure 19-11, complete the following exercises: A. Complete the chart below by estimating the relative air pressure expected at the pilot ports of the directional control valve. Describe the circuit action as the valves are activated and released. Assume instantaneous air exhaust.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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atic system
2. Based on the circuit shown in Figure 19-11,
complete the following exercises:
A. Complete the chart below by estimating the
relative air pressure expected at the pilot ports
of the directional control valve. Describe the
circuit action as the valves are activated and
released. Assume instantaneous air exhaust.
s are used
hit, they
he setting
Relative Pressure
at Pilot Ports
Circuit
Valve
Retraction
Extension
can be
nust be
Operation
pilot
pilot
Action
Atmospheric System
pressure
(Psystem)
Valves
Pilot-
A and B
depressed.
pressure
(Patm)
operated
valve shifts
alves, flow
allowing air
to flow into
blind end of
lines.
esigned
ers.
ions
e used to
the cylinder,
cylinder
begins to
extend
Valve A
depressed,
B released.
Valves
A and C
depressed.
circuit
Valve A
nts
depressed,
Valve C
released.
down
-urized
Valve A
released.
B. What components affect the pressure at the
blind and rod end of the cylinder during
circuit operation?
C. Modify the circuit so that air at lower pressure
can be delivered to the pilot-operated
directional control valve. Describe the impact
of
to
nder
your modification on circuit operation.
ait?
Transcribed Image Text:atic system 2. Based on the circuit shown in Figure 19-11, complete the following exercises: A. Complete the chart below by estimating the relative air pressure expected at the pilot ports of the directional control valve. Describe the circuit action as the valves are activated and released. Assume instantaneous air exhaust. s are used hit, they he setting Relative Pressure at Pilot Ports Circuit Valve Retraction Extension can be nust be Operation pilot pilot Action Atmospheric System pressure (Psystem) Valves Pilot- A and B depressed. pressure (Patm) operated valve shifts alves, flow allowing air to flow into blind end of lines. esigned ers. ions e used to the cylinder, cylinder begins to extend Valve A depressed, B released. Valves A and C depressed. circuit Valve A nts depressed, Valve C released. down -urized Valve A released. B. What components affect the pressure at the blind and rod end of the cylinder during circuit operation? C. Modify the circuit so that air at lower pressure can be delivered to the pilot-operated directional control valve. Describe the impact of to nder your modification on circuit operation. ait?
NVIDIA
GEFORCE
GTX
(intel)
CORE I7
Bth Gen
Chapter 19 Applying Pneumatic Power
475
Valve B
Valve C
Extension pilot
Retraction pilot
Valve A
Goodheart-Willcox Publisher
Figure 19-11. Automatic cylinder reciprocation is possible with this circult The cylinter continuously extends and retracts as
long as the system is pressurized and valve A is activated.
cylinder continues to extend until the ramp depresses
the activation mechanism on Valve C.
When Valve C is shifted, air is directed to the
Retraction pilot of the four-way directional control
valve. The pilot shifts the valve to direct air to the rod
end of the cylinder. The cylinder begins to retract. The
ramp moves off Valve C, which allows the Retraction
pilot line to vent. The cylinder continues to retract until
the ramp depresses the activation mechanism on Valve B
This allows system air pressure to again activate the
Extension pilot, beginning another sequence. The cylin-
der continues to reciprocate as long as Valve A is held
in the shifted position to keep the system pressurized.
19.6.1 Booster Circuit
A pressure higher than that produced by the system
compressor is sometimes needed for the operation of
a section of a pneumatic circuit. This higher pressure
can be provided by specialized air-to-air or air-to-oil
boosters. Many boosters are basically small-volume,
air-powered reciprocating pumps. They produce inten-
sified pressure for use in a small section of a system.
Figure 19-12 illustrates the circuit and operating
concepts involved in an air-to-air booster. The circuit
shows components in position to begin the process.
When the system is pressurized, air flows through
1 111
Transcribed Image Text:NVIDIA GEFORCE GTX (intel) CORE I7 Bth Gen Chapter 19 Applying Pneumatic Power 475 Valve B Valve C Extension pilot Retraction pilot Valve A Goodheart-Willcox Publisher Figure 19-11. Automatic cylinder reciprocation is possible with this circult The cylinter continuously extends and retracts as long as the system is pressurized and valve A is activated. cylinder continues to extend until the ramp depresses the activation mechanism on Valve C. When Valve C is shifted, air is directed to the Retraction pilot of the four-way directional control valve. The pilot shifts the valve to direct air to the rod end of the cylinder. The cylinder begins to retract. The ramp moves off Valve C, which allows the Retraction pilot line to vent. The cylinder continues to retract until the ramp depresses the activation mechanism on Valve B This allows system air pressure to again activate the Extension pilot, beginning another sequence. The cylin- der continues to reciprocate as long as Valve A is held in the shifted position to keep the system pressurized. 19.6.1 Booster Circuit A pressure higher than that produced by the system compressor is sometimes needed for the operation of a section of a pneumatic circuit. This higher pressure can be provided by specialized air-to-air or air-to-oil boosters. Many boosters are basically small-volume, air-powered reciprocating pumps. They produce inten- sified pressure for use in a small section of a system. Figure 19-12 illustrates the circuit and operating concepts involved in an air-to-air booster. The circuit shows components in position to begin the process. When the system is pressurized, air flows through 1 111
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