Bray 98 Series - Manual (Page 6)

All information herein is proprietary and confidential and may not be copied or reproduced without the expressed written consent of
BRAY INTERNATIONAL, Inc. The technical data herein is for general information only. Product suitability should be based solely upon customer’s
detailed knowledge and experience with their application.
S98 O & M : 6
Series 98 Operation & Maintenance
2.0 Introduction
The instructions and guidelines in this manual enable competent
technicians to install, operate, adjust and carry out routine mainte-
nance activities on Series 98 pneumatic 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 Actuators are designed for quarter turn rotary valves,
DA- Double Acting with a single cylinder
DD- Double Acting with dual cylinders
SC- Spring Return Fail Close (CW)
SO- Spring Return Fail Open (CCW)
form of Symmetrical Yoke and Canted Yoke.
Standard actuators have a mounting base to ISO 5211. MSS
mounting base is available as an option.
Mounting of the shaft driven accessories is per VDE 3845/
NAMUR standard.
The maximum operating pressure of the Series 98 Pneumatic
Scotch Yoke Actuators range from 40 to 150 psig, depending
operating pressure) charts or the name plate on the actuator for
the maximum operating pressure.
to 40 microns or better, with dew point of -20°C (-4°F) or at least
10°C (18°F) below ambient temperature.
The user shall plan and implement a periodic maintenance
program to ensure the service conditions continue as intended
and the actuator is monitored and maintained per manufacturer’s
recommendations.
3.0 Installation
The S98 actuators are assembled, tested and delivered per the
direct onto the valve or may require a mounting kit that would
include a bracket, coupler shaft with keys and hardware.
WARNING
Use appropriate eye bolts and slings to lift the actuator. Refer to
Table 8.0 for the approximate actuator weight. The lifting eye
bolt holes provided are for lifting the actuator only and not for
lifting the complete valve-actuator-accessory assembly.
NOTICE
1. The user shall ensure installation in intended service
conditions and that the actuator is not covered with
dirt/dust or other substances that may affect any heat
dissipation capability, resulting in exceeding the maximum
temperature rating of the actuator.
2. To prolong actuator seal life use only recommended
filtered media.
3. The actuator shall not be installed in hazardous
areas incompatible with the defined gas groups and
temperature class.
4. When using manual override sandwich gearbox, ensure
the gearbox has over travel at least equal to that of the
actuator.
5. The actuators can be mounted on valves in different
positions, but care shall be taken to reorient suitably, some
accessories like filter regulation units, hydraulic override
power pack reservoirs, etc. that are gravity dependent for
functioning.
Before proceeding with installation, check compatibility of the
(keyways / double D / square) must match. Additionally, check
compatibility of valve and actuator bolting pattern. If using a
actuator bore and the valve stem.

venting the ports to atmosphere and any power sources to
accessories are disconnected.