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RADIUS LLC
4922 Technical Drive
Milford, Mi 48381
SERIES A
OPERATION AND
INSTRUCTION MANUAL
There are two series of RADIUS rack & pinion air actuators: those with aluminum bodies and those with
nodular iron bodies. For a better understanding please refer to the table below.
Double action
Single action
Aluminum actuators
series 003 through 500
series 003 through 500
Cast iron actuators
series 750 only
series 750 only
The technical features of the aluminum actuators are listed below. If further information on nodular cast
iron is required, please contact RADIUS.
DESCRIPTION
RADIUS actuators are quarter turn actuators; that is to say that the actuator shaft turns 90
°
, although some
models can be ordered with turning angles of up to 180
°
. The design of these actuators uses the system of a
double rack – single pinion. One of the most outstanding features of RADIUS actuators, available only
with the aluminum models, is its proprietary, revolutionary double travel stop system. This system allows a
complete regulation of the opening and closing of the aperture without having to remove the covers.
The standard units produce a torque between 132 and 52,660 lb. in. at 80 psi that, together with the shaft’s
output range and its modular design, allows the attachment of a wide variety of control accessories.
ATTACHMENT OF THE ACTUATOR
The RADIUS actuators can be installed directly or by using an adapter on the shaft of any valve. They
have a female coupling machined directly on the shaft that meets DIN-3337 and ISO-5211 standards.
RADIUS also offers a complete range of accessories to complement any coupling concept.
INSTALLATION OF THE ACTUATOR
The RADIUS actuators are normally installed so that their longitudinal axis is parallel to the direction of
the pipeline. The actuators can be installed on top, on the side or underneath the valve they are to attach to
without affecting their operation in anyway.
The actuator output shaft is completely machined and in the shape of an eight pointed star, following DIN-
3337 and ISO-5211 standards, which allows the actuator to be oriented in a way that can adapt to nearly
every installation.
