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PNEUMATIC ACTUATORS
ASD SERIES
SPRING-DIAPHRAGM ROTARY ACTUATORS
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
This instruction manual includes installation, operation
and maintenance information for FNW Pneumatic Spring-
Diaphragm Actuators. Please read these instructions
carefully and save them for future reference. It is important
that only properly trained personnel disassemble or
assemble the actuator.
GENERAL PRODUCT DESCRIPTION
The FNW Spring-Diaphragm Actuator is specifically
designed for the safe and reliable operation of quarter turn
valves under minimal media supply pressure. The design
separates the supply media chamber from the spring sets,
allowing for usage of unfiltered air, gas, water or mineral-
based hydraulic fluid. The housing is constructed from
ductile iron and carbon steel castings coated in a
UV-resistant polyester powder coating for exceptional
corrosion resistance in the field. The independent media
chamber is also equipped with a standard LNBR diaphragm
reinforced with a special compound polyamine fabric.
Optional diaphragm materials allow for working temperature
ranges as low as -40°C (-40°F) or as high as 170°C (338°F).
1. CAUTION/IMPORTANT SAFETY WARNINGS
• Only authorized and properly trained personnel should perform installation and maintenance of the actuator. Proper PPE
should be used as required.
• Before working on a FNW Spring-Diaphragm Actuator, please note that all fasteners and screw threads are metric except
for the JB mount screw threads which are imperial.
• For correct and safe operation, pneumatic actuators must be sized adequately and with sufficient safety margin of torque
output for the correct operating conditions of the valve or application.
• Operating the actuator beyond its stated maximum operating limits of temperature, pressure or recommended operating media
can cause damage to the internal components, actuator housing or result in personal safety risks involving death or injury.
• Before carrying out any installation, repair or maintenance on the actuator, make sure that the electrical connections have
been safely isolated, removed or disconnected by authorized personnel. All pneumatic supply lines should be shut-off,
removed and completely bled. The actuator must not be pressurized at any time during installation, repair or maintenance
unless otherwise noted in the instructions, as injury may result.
• Never put any part of your body in the opening or port of the controlled valve or device.
• Special attention and precautions should be observed due to the stored energy contained in the spring cartridge. Do not
attempt to disassemble the spring cartridge. Disassembly may result in damage or personal injury. If maintenance is required for
the spring cartridge, the entire actuator should be returned to FNW for assistance. Please contact FNW for additional information.
• When servicing a valve actuator assembly, the best practice is to remove the entire assembly from service. If the actuator
is removed from the valve, it should be remounted on the same valve after servicing is completed. The actuator must be
readjusted for proper open and close position each time it is remounted.
• Before installing the valve and actuator, be sure that the indicator pointer () on top of the actuator and the indicator plate
() are correctly indicating the valve position. Failure to assemble the valve and actuator to the correct valve position could
result in damage or personal injury.
• Do not lift actuators using the /" NPT in the diaphragm cover. Actuators should be handled using lifting straps as seen in
Section .
• Use only FNW-recommended spare parts for maintenance.
• To ensure safety and to maintain warranty, never modify the actuator in any way not indicated in this manual without prior
approval from FNW.
