Fairchild 4500A User manual

CROSSSECTION
Figure1. Model4500ADetailDrawing
GENERALINFORMATION
The Model 4500A Pneumatic Volume Booster repro-
duces a pneumatic signal in a 1:1 ratio or in multiplying
or dividing ratios. It is ideal for systems requiring input
isolation or increased flow capacity.
The Model 4500A has the following features:
• Five(5)signaltooutputratiosmeetmostcontrolelement
requirements.
• Control sensitivity of 1" water column allows use in
precision applications.
• Large Supply and Exhaust Valves provide high forward
and exhaust flows.
• Soft Supply and Exhaust Valve seats minimize air con-
sumption.
• Abalanced Supply Valve minimizes the effect of supply
pressure variation.
• An Aspirator Tube compensates downstream pressure
droop under flow conditions.
• A separate Control Chamber isolates the diaphragm
from the main flow to eliminate hunting and buzzing.
• Optional remote feedback port minimizes pressure drop
at final control element under flow conditions.
1 Model 4500A
• The optional adjustable By-pass Valve lets you tune for
optimum dynamic response. (1:1 Ratio Only)
• UnitconstructionletsyouservicetheModel4500Awithout
removing it from the line.
OPERATING PRINCIPLES
When signal pressure on the top of the Signal Dia-
phragm creates a downward force on the Diaphragm
Assembly, the Supply Valve opens. Output pressure
flows through the Outlet Port and the Aspirator Tube
to the Control Chamber to create an upward force on
the bottom of the Control Diaphragm. When the
setpoint is reached, the force of the signal pressure
thatacts on thetop ofthe SignalDiaphragm balances
with the force of the output pressure that acts on the
bottom of the Control Diaphragm to close the Supply
Valve.
When the output pressure increases above the sig-
nal pressure, the Diaphragm Assembly moves up-
ward to close the Supply Valve and open the Exhaust
Valve. Because the Poppet Valve is closed, pressure
flows down the Connecting Tube to the bottom of the
Motor Diaphragm. This pressure keeps the Supply
Valve tightly closed while in the exhaust mode. The
Poppet Valve opens and excess output pressure
exhausts through the vent in the side of the unit until
it reaches the setpoint. For more information, see
Figure 1.

OUTLINEDIMENSIONS
SPECIFICATIONS
Figure 2. Model4500AOutline Dimensions
31/64
12.2
43/64
20.4
5/16
8.1
3/8
9.5
By-pass
Valve Closed
By-pass
Valve Open
3 19/64
83.8
5 5/64
128.8
3 13/32
86.6
4 1/2
114.3
By-pass Valve
1:1 Ratio Only
(optional)
Exhaust
Vents (8)
(keep clear)
3/8 NPT
Inlet Port
3 1/2
88.9
(typical)
Face Dim. 1/4 NPT
Gage Ports (2)
(typical)
1/4 NPT
Signal Port
3/8 NPT
Outlet Port
(typical)
1/8 NPT
Remote
Feedback
Port
(optional)
2 53/64
71.8
2 19/64
58.5
1 9/16
39.6
5 53/64
148.2
1
25.4
Hex.
1 13/32
35.9
1/2 NPT Tapped
Exhaust Port
(optional)
FUNCTIONALSPECIFICATIONS PERFORMANCESPECIFICATIONS
Ratio 1:1 1:2 1:3 2:1 3:1 Ratio 1:1 1:2 1:3 2:1 3:1
psig
[BAR]
(kPa)
Maximum
Output
Pressure
150
[10.0]
(1000)
150
[10.0]
(1000)
150
[10.0]
(1000)
75
[5.0]
(500)
50
[3.5]
(350)
psig
[BAR]
(kPa)
Maximum
Supply
Pressure
250
[17.0]
(1700)
250
[17.0]
(1700)
250
[17.0]
(1700)
250
[17.0]
(1700)
250
[17.0]
(1700)
Flow Capacity
100psig,[7.0BAR],
(700kPa)supply,
20psig,[1.5BAR],
(150kPa)setpoint.
SCFM
(m3/HR)
150
(255)
150
(255)
150
(255)
150
(255)
150
(76.5)
ExhaustCapacity
DownstreamPressure
5psig,[.35BAR],
(35kPa)above
20psig,[1.5BAR],
(150kPa)setpoint.
SCFM
(m3/HR)
40
(65.2)
40
(65.2)
40
(65.2)
40
(65.2)
40
(18.7)
Sensitivity
WaterColumn (cm) 1"
(2.54) 2" (5.08) 3" (7.62) 2"
(5.08) 2"
(5.08)
RatioAccuracy
%of 100 psig, [7.0 BAR],
(700kPa)outputspan. 3.0 3.0 3.0
%ofoutputspanwith
100psig,[7.0BAR],
(700kPa)inputspan. 3.0 3.0
Supply
PressureEffect
forchangeof100psig
[7.0BAR],(700kPa).
psig
[BAR]
(kPa)
0.10
[.007]
(0.7)
0.20
[.014]
(1.4)
0.30
[.021]
(2.1)
0.10
[.007]
(0.7)
0.10
[.007]
(0.7)
Ambient
Temperature -40-0Fto 200-0F
(-400Cto93.30C)
Materials
ofConstruction
Body & Housing . . . . . . . . . . . . . . . . . .Aluminum
Trim . . . . . . . . . . . . . . . .ZincPlatedSteel,Brass
Diaphragm . . . . . . . . . . . . . . . . NitrileonDacron
Model 4500A 2

ORDERINGINFORMATION
Figure 3. Model 4500AInflation and Test PressureApplication
TYPICAL APPLICATION
TYPICALAPPLICATION
ORDERINGINFORMATION
Model
T8000
Model
T6000
Pneumatic
Electrical
Controller
B
4-20 mA Feedback
120 psig,
[8.0 BAR],
(800 kPa)
Supply
30 psig, [2.0 BAR], (200 kPa) or
50 psig, [3.5 BAR], (350 kPa)
4-20 mA
Model
4516A
Tire
The Model 4500A controls inflation and test pres-
suresofatiretestingmachine. Anelectroniccontrol-
ler transmits a 4-20 mA signal to a TA6000-405
transducer. The transducer sends an output signal
to a Model 4516ABooster. The booster provides a
setpressuretosetthetireonthebead. Thebooster
also reduces and maintains the pressure during
testing. The T8000 senses the tire pressure and
sendsa 4-20mAsignalto theControllerto closethe
loop. For more information, see Figure 3.
INSTALLATION
For installation instructions, see the Model 4500A Pneu-
matic Volume Booster IOM, IS-2004500A.
Catalog Number 45 A
Ratio
1:1 (1)
1:2 (2)
1:3 (3)
2:1 (4)
3:1 (5)
Pipe Size
3/8 NPT (3)
1/2 NPT (4)
3/4 NPT (6)
Options
TappedExhaust (E)
By-passValve1 (I)
Feedback (P)
BSPT(Tapered) (U)
BSPP (Parallel) 2(H)
1 For 1:1 Ratio Only.
2 BSPP Threads in Inlet & Outlet. Others BSPT.
CS-2004500A
Litho in USA
Rev. B 11/02
1
4
E
VRG CONTROLS USE MODEL 4514AE
x
x
x