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MODEL
90AF4A-3
Pressure Reducing Valve
• Maintains constant downstream pressure
• Closes quickly to prevent downsream surge when flow is
stopped suddenly
• Deadman control
• Surge control prevents damage to refuelers
• Used in conjunction with Cla-Val Bottom-Loading Pantograph
• Fail-safe operation
The Cla-Val Model 90AF-4A-3 Hytrol Valve is used as the basic unit in almost
all Cla-Val automatic control valves for petroleum applications. The 90AF-4A-3
is a hydaulically-operated, diaphragm actuated, globe or angle pattern valve. It
is available in various materials and full range of sizes. It consists of three major
components: body, diaphragm assembly and cover. The diaphragm assembly
is the only moving part. The rugged simplicity of design and packless
construction assure a long life dependable, trouble-free operation. Should the
diaphragm become damaged the valve will close tight, providing “fail safe”
operation. The 90AF-4A-3 Hytrol Valve is used in many types of piping system
requiring control, flow regulation, rate of flow control, or check valve operation.
Schematic Diagram
Item Description
1 100-34 Hytrol (Reverse Flow)
2 X47A Ejector
3 Bell Reducer
4 CFM2 Float Control
5 X101 Valve Position Indicator
X105L Switch Assembly (Optional)
Optional Features
Item Description
A X46A Flow Clean Strainer
B CK2 Cock (Isolation Valve)
C CV Flow Control (Closing)
G 81-01 Check Valve With Cock
Q Quick Connect Assembly
S CV Flow Control (Opening)
T 55F Thermal Relief Control
Specifications
Sizes
Globe: 1 1/2” - 16” flanged
Angle: 2” - 16” flanged
End Details
Flanged:
Cast Aluminum, 150 ANSI B16.1
Cast Bronze, 150 & 300 ANSI B16.24
Ductile Iron, 150 & 300 ANSI B16.42
Cast Steel, 150 & 300 ANSI B16.5
Temperature Range
Light Petroleum Product -40° to+140°F
Pressure Ratings
150 class 175-PSI Max.
150 class 275-PSI Max.
250 class 300-PSI Max.
300 class 400-PSI Max.
Material
Body & cover:
Cast Aluminum 356-T6
Cast Bronze ASTM B62
Ductile Iron ASTM A-536
Cast Stainless Steel 303
Cast Steel ASTM A216-WCB
Valve trim:
Bronze ASTM B61
Stainless Steel 303
Rubber parts:
Buna-N® Synthetic Rubber
Viton
Other Materials
Available on Special Order
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Principle of Operation
B
C
Tight Closing Operation
When pressure from the valve inlet (or
an equivalent independent operating
pressure) is applied to the diaphragm
chamber, the valve closes drip-tight.
When pressure in the diaphragm chamber
is relieved to zone of lower pressure under
the valve. Flow in either direction is
permitted.
Full Open Operation
The valve modulates when diaphragm
chamber pressure is held at an
intermediate point between inlet and
discharge pressure changes, the
pressure above the diaphragm is varied
allowing the valve to modulate and
compensate for the changes.
SIZE 1 1/2 2 2 1/2 3 4 6 8 10 12 14 16
A 125 & 150 ANSI 8.50 9.38 11.00 12.00 15.00 20.00 25.38 29.75 34.00 39.00 41.38
AA 250 & 300 ANSI 9.00 10.00 11.62 13.25 15.62 21.00 26.38 31.12 35.50 40.50 43.50
B DIAMETER 5.62 6.62 8.00 9.12 11.50 15.75 20.00 23.62 28.00 32.75 35.50
C MAX. 5.50 6.50 7.56 8.19 10.62 13.38 16.00 17.12 20.88 24.19 25.00
D 1.12 1.50 1.69 2.06 3.19 4.31 5.31 9.25 10.75 12.62 15.50
E 125 & 150 ANSI 4.75 5.00 6.00 7.50 10.00 12.75 14.88 17.00 19.50 20.81
EE 250 & 150 ANSI 5.00 5.88 6.38 7.88 10.50 13.25 15.56 17.75 20.25 21.62
F 125 & 150 ANSI 3.25 4.00 4.00 5.00 6.00 8.00 8.62 13.75 14.88 15.69
FF 250 & 300 ANSI 3.50 4.31 4.38 5.31 6.50 8.50 9.31 14.50 15.62 16.50
CVFactor
VALVE SIZE 1 1/2 2 2 1/2 3 4 6 8 10 12
100-34 GLOBE PATTERN 26 49 80 107 200 440 771 1151 1600
100-34 ANGLE PATTERN 30 62 100 137
CVfactor is defined as the number of gallons per minute of water at 60˚F. which will flow at a 60˚F. which will flow at a
one pound per square inch differential.
Purchase Specifications
The valve shall be hydraulically-operated, diaphragm-actuated, globe or angle pattern
valve. It shall contain a resilient, synthetic rubber disc, having a rectangular cross
section, contained on three and on-half sides by a disc retainer and disc guide, forming
a tight seal against a single renewable seat. The valve stem shall be guided at both
ends by a bearing in the valve cover and an integral bearing in the valve seat. The
diaphragm assembly shall be the only moving part and shall form a sealed chamber in
the upper portion of the valve, separating operating pressure from line pressure. The
diaphragm consist of nylon fabric bonded with synthetic rubber and shall not be used
as a seating surface. Packing glands and/or stuffing boxes are not permitted and there
shall be no pistons operating the valve. All necessary repairs shall be possible without
removing the valve from the line. If the diaphragm becomes damaged the valve shall
close tight. This valve shall be a Model 100-34 (globe pattern or angle pattern) Hytrol
Valve as manufactured by Cla-Val. Newport Beach, California.
Specify When Ordering
1. Size
2. Model
3. Pressure Class
4. Temperature and fluid to be handled
5. Static and flowing line pressure
6. Operating fluid and pressure
7. Body and trim materials
8. End details
Modulating Action
100AF
B
C
E
EE
90AF-4A-3
Globe or Angle
(if other than line pressure)
D
FFF
E-90AF-4A-3 (R-04/2012)
LA-VAL
PO Box 1325 Newport Beach CA 92659-0325
Phone: 949-722-4800 Fax: 949-548-5441
CLA-VAL CANADA CLA-VAL EUROPE
4687 Christie Drive
Beamsville, Ontario
Canada L0R 1B4
Phone: 905-563-4963
Fax: 905-563-4040
©COPYRIGHT CLA-VAL 2012 Printed in USA
Specifications subject to change without notice.
Chemin dés Mesanges 1
CH-1032 Romanel/
Lausanne, Switzerland
Phone: 41-21-643-15-55
Fax: 41-21-643-15-50
www.cla-val.com
Represented By:
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