AAO Valves

Air Shutoff Valves

  • Sizes: Valves come in sizes 2” thru 8” nominal connections
  • Air Pressure to Open / Spring to Close (failsafe)
  • Part of the A Series of easily installed, compact, air intake valves for diesel engine emergency shut down.
  • New Speed Switch Kit available for a complete overspeed installation

The AAO version of the FPE A Series of shutdown valves is designed to be installed in the air intake system of a diesel engine to provide an emergency means of rapid shutdown.

The AAO valve is suitable for applications where there is a supply of filtered dry or lubricated air (or inert gas) available form 3 to 8 Bar (43 to 116 psi).This air supply is used to close the AAO valve thereby bringing the running engine to a stop within a few seconds in an emergency. Venting of the air pressure signal results in the automatic reset of the valve to the open condition. This mode of operation makes the AAO valve suitable for applications where non-failsafe operation is permitted such as emergency vehicles etc.

A shutdown control system is required to automatically vent the air pressure signal to the AAO when engine overspeed or any other selected fault condition, including loss of the supply air pressure, is sensed.

Important Note: A manual emergency shutdown button should also be incorporated in the shutdown control system. The low intake air flow restriction through the open valve makes it generally compatible with the requirements of low emission diesel engines.

Corrosion resistant materials are used where applicable in the construction of the valve. This lightweight and compact valve design together with the availability of factory fitted hose adaptors selected from a wide range of optional sizes assists in easy installation.

The valve may be fitted to either turbocharged or naturally aspirated engines. In the case of turbocharged engines temperature limitations may restrict the position in which the valve may be installed in the intake system.

Description

In standard form the AAO valve is available complete with hose adaptors as selected by the customer from a range of standard sizes – see diagram below and data on pages 4 and 5. Where a requirement exists for a non- standard adaptor size or other alternative form of intake pipe connecton such as flanged joint, please pass details of requirement to FPE or your FPE supplier for invesigation.

The valve has a metal to metal seal when closed. It is designed for low closing friction and long life of the sealing surfaces and is designed to withstand high shock loads without malfunction.

The diagram below and the diagrams and data on page 4 to 5 cover the main features and basic dimensions of the AAO including selection of options and order coding.

Dimensions

AAO Valves - Dimensions Metric Table

METRIC TABLE DIMENSIONS (MM) WEIGHT (KG) ORDER CODE
MODEL H TO SUIT HOSE BORE BORE A B C D E
AAO 38 57 81 196 50 20 1.38 38
44 1.377 44
51 1.38 51
57 1.37 57
64 1.37 64
70 1.41 70
70 65 91 207 28 28 1.31 70S
76 71 99 215 28 25 1.22 76
83 1.31 83
89 1.51 89
95 1.69 95
102 95 125 241 35 25 1.68 102
108 1.76 108
114 1.85 114
121 2.13 121
127 120 154 270 42 25 2.14 127
133 2.24 133
140 2.37 140
146 2.69 146
152 145 185 302 49 25 2.94 152
159 3.08 159
165 3.21 165
171 3.35 171
178 171 215 330 56 30 3.97 178
203 192 238 351 65 40 5.36 203

AAO Valves - Dimensions Imperial Table

IMPERIAL TABLE DIMENSIONS (INCHES) WEIGHT (LB) ORDER CODE
MODEL H TO SUIT HOSE BORE BORE A B C D E
AAO 1.50 2.24 3.19 7.72 1.97 0.79 3.04 38
1.73 3.02 44
2.01 3.04 51
2.24 3.02 57
2.52 3.02 64
2.76 3.11 70
2.76 2.56 3.58 8.15 1.10 0.98 2.89 70S
2.99 2.80 3.90 8.46 1.10 0.98 2.69 76
3.27 2.89 83
3.50 3.33 89
3.74 3.73 95
4.02 3.74 4.92 9.49 1.38 0.98 3.70 102
4.25 3.88 108
4.49 4.08 114
4.76 4.70 121
5.00 4.72 6.06 10.63 1.65 0.98 4.72 127
5.24 4.94 133
5.51 5.23 140
5.75 5.93 146
5.98 5.69 7.25 11.84 1.92 0.98 6.48 152
6.26 6.79 159
6.50 7.08 165
6.73 7.39 171
7.01 6.73 8.46 12.99 2.20 1.18 8.75 178
7.99 7.56 9.37 13.82 2.56 1.57 11.82 203

Part Number Look Up

FPE Number Range in MM AMOT/Chalwyn Number
CO18- 025 to 045 D30
CFO20-* 035 to 044 D35BF
CO27- 035 to 044 D41
CO45- 045 to 070 D45/D51**
CO78- 051 to 077 D57/D64**
CO90- 070 to 089 D70
C110- 070 to 089 D80
C140- 089 to 102 D92
C185- 089 to 114 D102
C235- 102 to 140 D121
C290- 127 to 153 D136
C450 152 to 229 D200

* This ASV Includes a Filter
** FPE part numbers listed are used to replace both Amot/Chalwyn part numbers show

General & Pneumatic Specifications

AAO Valves - General and Pneumatic Specification

GENERAL DESCRIPTION:
A slim butterfly valve designed for emergency shutoff of the engine air intake.
Operating Mode: Air pressure to open, Spring to close (failsafe).
GENERAL SPECIFICATION:
Temperature: Ambient: -40°C to 120°C Max intake air temp: 120°C
Construction: Body and disk: Hard anodized Aluminium, Other main components: Stainless steel, Aluminum Hose adaptors: Aluminum
PNEUMATIC ACTUATOR SPECIFICATION:
Air Pressure: Min: 3 Bar (43 psi), Max: 8 Bar (116 psi)
Air Supply: Filtered Air: ISO 8573 Class 4

Specifications

Valve Selection

To enable FPE to select the most suitabe version of the AAO valve for the customers application the following data is required:

Bore size of the intake hose into which the intake valve is to be fitted – refer to section headed “Description and Main Dimensions”.

AAO Valves- FPE Coding

FPE CODING
AAO AAO Series
XXX Adaptor Size (order code in table)
-
SOOO Special Features Code (SOOO)

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