Series 98 & 98H Scotch Yoke Actuator
Installation, Operation and Maintenance Manual
© 2020 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information contained herein shall not be copied, transferred,
conveyed, or displayed in any manner that would violate its proprietary nature without the express written permission of Bray International, Inc.
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1.1 Hazard-free Use
This device left the factory in proper condition to be safely
installed and operated in a hazard-free manner. The notes
and warnings in this document must be observed by the user
if this safe condition is to be maintained and hazard-free
operation of the device assured.
• Take all necessary precautions to prevent damage due to
rough handling, impact, or improper storage. Do not use
abrasive compounds to clean, or scrape its surfaces with
any objects.
• Configuration and calibration procedures are described
in this document. Proper configuration and calibration is
required for the safe operation of this product.
• The control system in which the unit is installed must
have proper safeguards to prevent injury to personnel,
or damage to equipment, should failure of system
components occur.
• This document does not cover every detail about every
version of the product described. It cannot take into
account every potential occurrence in installation,
operation, maintenance and use.
• If situations transpire that are not documented in sufficient
detail, please request the required information from the
Bray Distributor or Representative responsible for your area.
1.2 Qualified Personnel
A qualified person in terms of this document is one who is
familiar with the installation, commissioning and operation of
the product and who has appropriate qualifications, such as:
• Is trained in the operation and maintenance of
pneumatic and hydraulic pressure equipment and
systems in accordance with established safety practices.
• Is trained or authorized to energize, de-energize,
ground, tag and lock electrical circuits and equipment in
accordance with established safety practices.
• Is trained in the proper use and care of personal protective
equipment (PPE) in accordance with established safety
practices.
• Is trained in first aid.
• In cases where the device is installed in a potentially
explosive (hazardous) location – is trained in the
operation, commissioning, and maintenance of
equipment in hazardous locations
2.0 INTRODUCTION
The instructions and guidelines in this manual enable
competent technicians to install, operate, adjust and carry out
routine maintenance activities on Series 98 pneumatic and
hydraulic actuators. Responsibility lies with the user to follow
the instructions in this and in any additional documentation
related to the product and accessories supplied with it.
User shall ensure the equipment is installed and operated
in the environment that it is intended for and effective
protections are provided against exposure to pressure and
temperature in excess of maximum rating. Failing to do so
may affect the product warranty. Only trained personnel,
aware of precautions in hazardous environments and health
and safety in the workplace should service the equipment.
Series 98 Scotch Yoke Actuators are designed for quarter
turn rotary valves, in configurations as:
DA- Double Acting with a single cylinder
DD- Double Acting with dual cylinders
SC- Spring Return Fail Close (CW) - Symmetrical and
Canted Yoke
SO- Spring Return Fail Open (CCW) - Symmetrical Yoke
only.
The pneumatic pressure module of the S98 is replaced with a
Read and Follow These Instructions
Save These Instructions
1.0 - DEFINITION OF TERMS
indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury.
NOTICE
used without the safety alert symbol indicates a potential situation which, if not avoided, may
result in an undesirable result or state, including property damage.
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