Turn-Act / Air-Oil Systems rotary vane actuators and motion controls

Single moving part architecture and zero-backlash rotary vane mechanics

Turn-Act pneumatic rotary vane actuators produced by Compact Automation Products (an ITT Inc. company) are built around an innovative one-piece unitized extruded body profile.

The internal cylindrical bore, structural stator barrier, and high-tensile mounting tie lobes are integrated into a single rigid extrusion, preventing joint separation under high-frequency dynamic cycles.

The defining mechanical advantage of the Turn-Act architecture is having only one moving component — the central drive rotor equipped with an integral dynamic vane.

Eliminating gear racks, pinions, levers, and intermediate ball linkages guarantees zero backlash, total angular repeatability, and steady continuous torque across the full rotational stroke.

Patented polyurethane seals and 25-million cycle endurance

A critical engineering feature ensuring the longevity of Turn-Act rotary actuators is their patented molded polyurethane stator and rotor sealing system.

The custom profile elastomeric seals maintain dynamic contact against the cylindrical bore without requiring supplemental oil mist lubrication, supporting environmentally clean assembly rooms.

Field performance records across automated production plants confirm operational service lives exceeding twenty-five million trouble-free cycles without torque decay or seal fatigue.

For harsh chemical environments or elevated thermal processes, specialized fluoroelastomer seal kits and 303 stainless steel drive shafts are supplied.

Flagship TA Series and subcompact Comp-Act CA rotary actuators

The flagship TA Series encompasses an extensive output torque range from 87 to 5,200 in-lbs under operating supply pressures spanning 35 to 150 psi.

Single-vane configurations provide rotations of 90, 180, and 270 degrees, whereas double-vane architectures double effective output torque within the same frame footprint over 90 or 100 degree sweeps.

For robotic end-effectors, parts orientation grippers, and automated indexing shuttles, the Comp-Act CA Series delivers an ultra-compact footprint.

Its lightweight anodized aluminum frame minimizes robotic arm dynamic inertia, while precision full-complement needle bearings provide rigid shaft support under overhung side loads.

Heavy-duty Brute Series and combined Multi-Act linear-rotary modules

The Brute Series is engineered specifically for severe industrial environments including foundry equipment, heavy turnover fixtures, transfer tables, and automated welding positioners.

An oversized alloy steel output shaft and dual heavy-duty needle bearings absorb massive bending, overhung, and thrust loads across rotation sweeps extending up to 290 degrees.

Multi-Act motion modules unify an independent rotary vane actuator and a linear pneumatic cylinder into a single rigid monoblock assembly.

This integrated arrangement eliminates coupling alignment errors, reduces moving payload mass, and drastically minimizes the external pneumatic plumbing and position switches required on production cells.

VAL-U-ACT quarter-turn process valve operators with spring return

For mechanizing quarter-turn butterfly valves, ball valves, and industrial air dampers, Turn-Act supplies specialized VAL-U-ACT process valve operators.

The vane design delivers full continuous torque, overcoming high initial breakaway resistance of tight elastomer seats without generating damaging hydraulic shocks in plant piping.

The factory-assembled spring-return safety housing includes an integrated worm drive mechanism for adjusting spring pretension.

Maintenance technicians accurately calibrate seating shutoff torque directly on the pipeline without opening the pressurized pneumatic chamber, expediting plant installation and startup.

Air-over-oil fluid power integration and smooth hydraulic damping

Combining Turn-Act rotary vane actuators with Air-Oil (air-over-oil) fluid power circuits brings together plant compressed air economy with the motion rigidity and smooth velocity control of hydraulics.

An incompressible hydraulic fluid barrier prevents stick-slip surging and speed oscillations when handling fluctuating tooling resistance.

Through the Air-Oil Systems industrial supply channel, production facilities receive air-oil converter accumulator tanks, precision meter-out flow control valves, directional valves, air preparation units, and sensors, enabling rigid intermediate position locking at any point along the rotary sweep.

Precision mounting and stroke stop adjustment

Proper installation of Turn-Act rotary vane actuators requires accurate shaft alignment with the driven machinery. The rigid unitized extruded housing supports both direct face flange mounting and heavy-duty foot brackets.

Built-in adjustable stop screws allow fine tuning of angular endpoints, compensating for tooling tolerances.

To prevent dynamic shock loads on internal mechanical stops when indexing heavy loads at high speeds, external hydraulic shock absorbers or flow control meters are recommended. This guarantees smooth deceleration prior to reaching end of stroke without extending the automated cycle time.

Position sensor integration and lube-free operation

Stroke endpoint and intermediate position tracking for Turn-Act actuators is provided by compact magnetic reed switches or solid-state inductive sensors.

Sensors slide directly into longitudinal T-slots along the extruded body and clamp with a single screw, enabling rapid retooling during part changeovers.

Precision molded polyurethane seals provide reliable lube-free operation on filtered dry compressed air. Eliminating exhaust oil mist prevents contamination of sensitive optical sensors, electronic parts, and packaging surfaces while simplifying pneumatic system maintenance.

Torque calculation and sizing safety margins

Sizing a Turn-Act rotary actuator requires evaluating both static friction and dynamic inertia torques across the complete movement path. To overcome breakaway resistance in tight valve seals and accelerate tooling payloads, a torque safety factor between 1.3 and 1.5 is standard practice.

When plant pneumatic supply pressure fluctuates, calculations must reference the minimum guaranteed line pressure. For fast indexing cycles, angular acceleration and deceleration forces must be calculated based on the combined polar moment of inertia of arms and fixtures.

Preventive maintenance and seal replacement guidelines

The single moving part architecture of Turn-Act simplifies periodic inspection and operational monitoring. Recommended service routines involve logging cycle repeatability times, checking dynamic rod seals for pressure drop, and confirming smooth end-of-stroke deceleration.

When seal fatigue occurs after multi-million cycle operation, factory integrity is restored by installing a molded polyurethane seal overhaul kit without dismounting the extruded body from the tooling baseplate, saving valuable maintenance labor.