Variados

The
High
Performance
Company

SERIES 90/91
RACK AND PINION Double Acting & Spring Return

PNEUMATIC ACTUATOR

SERIES 90/91

Styling, strength,
compactness, and
simplicity of design have
been combined to produce
the best rotary actuator on
the market today. Bray
Controls is proud to
expand this successful
line of high performance,
highest quality pneumatic
actuators, theSeries
90/91. We have developed through engineering
excellence and precision
manufacturing a space
saving, modular product
line. Many features previously
available only as options are
built into the Bray Series 90/91.
This results in reduced overall

size requirements and economic
savings. In addition the Brayline
Accessories are fully modular
and directly mount to the
actuator -providing flexibility
and efficiency at reduced cost.
Bray Series 90/91 actuators are
rack and pinion, opposed-piston
actuators available in two
versions: double acting for
rotation of 90°, 135° and 180°,
and spring return for 90°
rotation. Their ideal use is
actuating butterfly, ball or plug
valves, but they can be applied
anywhere a rotation of 90°, 135°
or 180° is needed. Rotated on
lowfriction acetal bearings, Bray
units are well suited to handle
offset loads to the gear and

output shaft assembly.
Bray Series 90/91 actuators were
designed primarily for pneumatic
operation up to a maximum
pressure of 140 psig (10 Bar)
and for temperature ranges of
40°F (-40°) to +200°F (+95°).
For higher and lower
temperature applications, consult
factory. All double acting andspring return units are suitable
for both on-off and throttling
applications.
Actuators which can be actuated
with other media such as hydraulic oil or water are also available
as an option. Please consult Bray
factory for further information.

The Bray space-saving modular
product line is completely enclosed and
self contained. The many features of the
engineered design minimizemaintenance and provide safe, simple
disassembly and assembly.
The INTEGRAL PORTING (A)
reduces the cost of external tubing that
is also easily damaged. Offered for the
first time to the industry are the unique,
lubricated ACETAL PISTON GUIDES
(B) and RINGS (C). The acetal piston
guides and rings have a very low
coefficient of friction and absorb the
side thrusts of the pistons. In addition,the piston cylinder walls in the body are
honed to a very fine finish thus
reducing the overall coefficient of
friction. These features extend the life
of the actuator and make the Series
90/91 one of the most efficient actuators on the market.
The OUTPUT SHAFT BEARINGS
(D) on the top and bottom of the pinion
are made of low-friction acetal.
The OUTPUT SHAFT and PINION

GEAR (E) areone-piece, manufactured
from hardened alloy steel and zincplated for corrosion protection.
The SHAFT POSITION INDICATOR
(F) clearly shows open or closed
position and is easily removable for
MANUAL OVERRIDE FUNCTION
of the actuator when required.
The BODY (G) is extruded aluminum
with anodized corrosion protective
coating. The END CAPS (H) are epoxy
coated for chemical resistance. Thecoating is generally resistant to dilute
aqueous acids, salts, aliphatic hydrocarbons, detergents, petroleum solvents,
alcohols, greases and oils.

The TRAVEL STOP (I) adjusting
screws limit the travel of the actuator to
specific degrees of rotation. The
PISTONS (J) are die-cast aluminum.
The two PNEUMATIC SUPPLY
PORTS (K) are 1/8" NPT ports.
NAMUR interface is available on all
actuatorsizes.
All Bray Series 90/91 actuators have
permanently lubricated factory packed
bearings and guides. No further
lubrication is necessary under normal
operating conditions. All seals,
Including PISTON SEALS (L), are
permanently lubricated Buna-N
O-rings.

ENGINEERING

ACTUATOR DIMENSIONS
SIZE

61*

63

83

92

118

127

160

210

255**

AIR
NPT

1/8

1/8

1/8...