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ROTADISK Pneumatic Actuator RD & RDF

Operating Manual – BA3002 EN

3 Product Description

Page 31 of 79

also possible that the ROTADISK Pneumatic Actuator moves into the OPEN position by

means of the springs (spring opening or Fail Open) in the event of a compressed air drop.

The slewing angle of the ROTADISK Pneumatic Actuators can be adjusted by ±3° with the

standard end position setting

The ROTADISK Pneumatic Actuators of the RD & RDF types have standardised interfaces for

adding signal devices, positioners, solenoid valves and valves.

3.2 Variants

The ROTADISK Pneumatic Actuators of the RD & RDF types are available in different variants

which differ with regard to the size, spring package and sealing material.

3.3 Functional Description

The ROTADISK Pneumatic Actuators of the RD & RDF types operate according to the double

wing functional principle. The generated force is converted by two pistons (twin piston

principle) and a lever, the double swing arm, into useful torque at the drive shaft. The design

principle of the double swing arm achieves optimum transformation of the energy of the

compressed air into the useful torque. The user therefore benefits from a low air

consumption.

A high start and end torque results from the characteristic kinematic. The drive torque

characteristic therefore corresponds almost ideally with the torque behaviour of a ball valve

or a check valve. The compact design also allows later automation in confined spaces. The

anodised drive body and the PU-painted li das well as the rust and acid-resistant drive shaft

ensure reliable functioning even under the harsh conditions of the chemical industry.

The springs of the single-action pneumatic actuators are designed for more than 10

load

cycles and have optimal corrosion protection.

The end position setting is only possible in the open position of right-hand rotating pneumatic

actuators or the closed position of left-hand rotating pneumatic actuators. The end position setting

is not possible in the RD/RDF 2.5 models.

Flowserve ROTADISK RD User Manual

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