Overview
The NIBCO Sure Torque ST-DA is a proven double-acting pneumatic valve actuator designed for reliable operation in demanding industrial environments. With an 8″ size and 120 PSIG pressure rating, this valve actuator provides the torque and control necessary for butterfly valve, ball valve, and other quarter-turn isolation applications. The Sure Torque series represents decades of NIBCO engineering in pneumatic actuation technology.
Key Features
- Double-acting design for bi-directional control and fail-safe operation
- 8″ actuator frame size with 120 PSIG maximum operating pressure
- Durable aluminum body construction with internal hard-coat anodizing for corrosion resistance
- ISO 5211 compliance for standardized mounting to valve interfaces
- Low-friction internal design for consistent torque output and extended service life
- Forged steel travel stops adjustable for custom rotation angles
Technical Specifications
- Maximum Operating Pressure: 120 PSIG
- Actuator Size: 8″
- Configuration: Double-Acting (DA)
- Body Material: 6005T5 Extruded Aluminum
- Operating Temperature Range: -4 to 176°F (-20 to 80°C)
- Seal Materials: FKM/NBR/PTFE
- Travel Adjustment: ±5 degrees adjustable on open and close stops
- Standard Travel: 100 degrees (customizable)
- Mounting Standard: ISO 5211
- Series: ST (Sure Torque)
Typical Applications
- Water and wastewater treatment plant valve control
- HVAC system isolation and zone control
- Chemical processing and tank isolation
- Power generation and industrial steam systems
- Oil and gas pipeline isolation
- Food and beverage processing lines
- General industrial automation and process control
Compatibility & Replacements
Compatible With
- Butterfly valves (2″ through 24″ with ISO 5211 F mounting pads)
- Ball valves and other quarter-turn isolation valves
- Standard pneumatic pilot air systems (80-120 PSIG supply)
- NAMUR-specification solenoid valves and limit switches
- Industrial PLC and automation control systems
Replaces / Drop-In Replacement For
- NIBCO Sure Torque ST series pneumatic actuators (same frame size)
- Monovar and similar double-acting pneumatic valve actuators
- Verify compatibility with your system integrator before ordering.
Works With
- Direct-mount solenoid valves (NEMA 4, 7, 9 rated)
- Pneumatic positioners for modulating control (0.207–1.034 bar or 4–20 mA input)
- Limit switches for position feedback
- Manual gear override options for fail-safe manual operation
- Standard ISO 5211 valve interface systems
