ET Series Heavy-duty Pneumatic Actuators
Installation Operation& Maintenance Manual
Doc No. : HUMG-ET-16 Rev0 Page 3 / 18 Valve Automation Leader, HKC
1. Introduction
This manual is offered as a guide to performance, installation, operation, disassembly and after-
service of the ET- series Double Acting and Spring Return Module type models which are
manufactured by HKC Co., Ltd. The enterprise and the maintenance team responsible for the ET -
series must read this manual and use other relevant instruction manuals for respective accessories
such as the Positioner, Limit Switch and Solenoid Valve.
The scotch yoke type, having no load under a poor air pressure, is designed of 3 point piston guide
bars in order to maintain smooth operations and to prevent the deformation of piston, hence
optimizing the lifecycle of the product. Also, by using a semi-permanent, pin-on-disk phosphor
bronze and plastic TP 601 bushing material, any problems caused by leakage and wear may be
prevented. In addition, by applying special plastic bearings, which are specially lubricated, the
frictional abrasion between cylinder and piston is minimized therefore increasing durability. This
allows for the compact design to produce high torque. Various sizes of actuators are manufactured so
that a wide range of torque outputs can be obtained (from 495Nm to 250,000 Nm in 8bar of air
pressure). In order to adhere accessories and valves easily, both the NAMUR and ISO Standards are
applied in every adhering part.
1.1. Purpose
This installation, operation and maintenance manual explain how to install, operate and
maintain the ET-series pneumatic actuators.
1.1.1. The normal recommended service interval for the ET-series actuators is three years.
1.1.2. This procedure is applicable when all electrical power and pneumatic pressure has been
removed from the actuator.
1.1.3. Remove all piping and mounted accessories that may interfere with the module(s) that are
to be worked on.
1.1.4. This procedure should only be implemented by a technically competent technician who
takes care to observe good workmanship practices.
1.1.5. Products supplied by HKC, in its "as shipped" condition, are intrinsically safe if the
instructions contained within this Service Instruction are strictly adhered to and executed
by well-trained, equipped, prepared and competent personnel.
1.1.6. When removing seals from seal grooves, use a commercial seal removing tool or a small
screwdriver with sharp corners rounded off.
1.1.7. Use a non-hardening thread sealant on all pipe threads.
1.1.8. WARNING: Apply the thread sealant per the manufacturer’s instructions.
1.1.9. HKC CO., LTD. recommends that actuator disassembly should be performed in a clean
area on a workbench where possible.
1.2. Safety Notices
Safety notices in this manual outline precaution the user must take to reduce the risk of
personal injury and damage to the equipment. The user(s) must read these instructions before
the installation, operation or maintenance of ET-series pneumatic actuators.
Danger:
Refers to personal safety and alerts the user to danger or harm.
The hazard or unsafe practice will result in severe injury or death.
Warning:
Refers to personal safety. Alerts the user to potential danger.
Failure to follow warning notices could result in personal injury or death.
Caution:
Directs the user’s attention to general precautions that, if not followed, could
result in personal injury and/or equipment damage
.
Notes:
Highlighted information is critical to the user’s understanding of the actuator’s
installation and operation.
