Fairchild 4500A User Manual

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Page 2
CROSS SECTION
Figure 1. Model 4500A Detail Drawing
GENERAL INFORMATION
The Model 4500A Pneumatic Volume Booster repro­duces 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) signal to output ratios meet most control element
Control sensitivity of 1" water column allows use in
Large Supply and Exhaust V alves provide high forward
Soft Supply and Exhaust Valve seats minimize air con-
A balanced Supply Valve minimizes the effect of supply
An Aspirator Tube compensates downstream pressure
A separate Control Chamber isolates the diaphragm
Optional remote feedback port minimizes pressure drop
1 Model 4500A
The optional adjustable By-pass Valve lets you tune for
optimum dynamic response. (1:1 Ratio Only) Unit construction lets you service the Model 4500A without
removing it from the line.
OPERATING PRINCIPLES
When signal pressure on the top of the Signal Dia­phragm 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 that acts on the top of the Signal Diaphragm 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 sig­nal pressure, the Diaphragm Assembly moves up­ward to close the Supply V alve and open the Exhaust V alve. Because the Poppet V alve 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.
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3/8
9.5
5/16
8.1
By-pass Valve 1:1 Ratio Only (optional)
1/4 NPT Signal Port
43/64
20.4
31/64
12.2
By-pass Valve Open
By-pass Valve Closed
OUTLINE DIMENSIONS
Hex.
1
25.4
1 13/32
35.9
1/2 NPT Tapped Exhaust Port (optional)
5 5/64
128.8
3 19/64
83.8
3/8 NPT Inlet Port 3 1/2
Face Dim.
88.9 (typical)
3 13/32
86.6
FUNCTIONAL SPECIFICA TIONS
Maximum Output Pressure
Maximum Supply Pressure
Ratio
[BAR]
(kPa)
[BAR]
(kPa)
1:1 1:2 1:3
psig
150
[10.0]
(1000)
psig
250
[17.0]
(1700)
(1000)
(1700)
Flow Capacity
100 psig, [7.0 BAR], (700kPa) supply,
SCFM
150 20 psig, [1.5 BAR], (150 kPa) set point.
(m3/HR)
(255)
Exhaust Vents (8) (keep clear)
1/8 NPT Remote Feedback Port (optional)
3/8 NPT Outlet Port (typical)
1/4 NPT Gage Ports (2) (typical)
2 19/64
58.5
1 9/16
39.6
Figure 2. Model 4500A Outline Dimensions
SPECIFICATIONS
PERFORMANCE SPECIFICATIONS
2:1
3:1
150
[10.0]
250
[17.0]
150
(255)
150
[10.0]
(1000)
250
[17.0]
(1700)
150
(255)
75
[5.0]
(500)
250
[17.0]
(1700)
150
(255)
50
[3.5]
(350)
250
[17.0]
(1700)
150
(76.5)
Sensitivity
Water Column
Ratio Accuracy
% of 100 psig, [7.0 BAR], (700 kPa) output span.
% of output span with 100 psig, [7.0 BAR], (700kPa) input span.
Supply Pressure Effect
for change of 100 psig [7.0 BAR], (700 kPa).
Ratio
(cm)
psig
[BAR]
(kPa)
4 1/2
114.3
1:1 1:2 1:3
1"
2"
(2.54)
(5.08)
3.0 3.0 3.0
0.10
0.20
[.007]
[.014]
(0.7)
(1.4)
3"
(7.62)
0.30
[.021]
(2.1)
5 53/64
148.2
2 53/64
71.8
2:1
2"
(5.08)
3.0 3.0
0.10
[.007]
(0.7)
3:1
2"
(5.08)
0.10
[.007]
(0.7)
Exhaust Capacity
Downstream Pressure 5 psig, [.35 BAR], (35 kPa) above 20 psig, [1.5 BAR], (150 kPa) set point.
SCFM
(m3/HR)
40
(65.2)
40
(65.2)
40
(65.2)
40
(65.2)
40
(18.7)
Ambient Temperature
Materials of Construction
Body & Housing . . . . . . . . . . . . . . . . . .
Trim . . . . . . . . . . . . . . . .
Diaphragm . . . . . . . . . . . . . . . .
-40
-0
F to 200
-0
F
(-400C to 93.30C)
Aluminum
Zinc Plated Steel, Brass
Nitrile on Dacron
Model 4500A 2
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TYPICALAPPLICATION
1
4
E
VRG CONTROLS USE MODEL 4514AE
x
x
x
4-20 mA
120 psig, [8.0 BAR], (800 kPa) Supply
Pneumatic Electrical
Controller
4-20 mA Feedback
Model T8000
30 psig, [2.0 BAR], (200 kPa) or 50 psig, [3.5 BAR], (350 kPa)
Model T6000
Tire
B
Model 4516A
Figure 3. Model 4500A Inflation and Test Pressure Application
TYPICAL APPLICATION
The Model 4500A controls inflation and test pres­sures of a tire testing machine. An electronic control­ler transmits a 4-20 mA signal to a TA6000-405 transducer. The transducer sends an output signal to a Model 4516A Booster. The booster provides a set pressure to set the tire on the bead. The booster also reduces and maintains the pressure during testing. The T8000 senses the tire pressure and sends a 4-20mA signal to the Controller to close the loop. For more information, see Figure 3.
INST ALLA TION
For installation instructions, see the Model 4500A Pneu­matic Volume Booster IOM, IS-2004500A.
ORDERING INFORMATION
ORDERING INFORMATION
Catalog Number Ratio
1:1
1:2 1:3 2:1 3:1
Pipe Size
3/8 NPT 1/2 NPT 3/4 NPT
Options
T apped Exhaust
By-pass V alve
Feedback
BSPT(T apered)
BSPP (Parallel)
1
For 1:1 Ratio Only.
2
BSPP Threads in Inlet & Outlet. Others BSPT.
1
2
45
(1) (2) (3) (4) (5)
A
(3) (4) (6)
(E)
(I) (P) (U) (H)
CS-2004500A Litho in USA Rev. B 11/02
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