Key Benefits and Advantages
Precision Mechanical Positioning: The AV1 uses a high-gain pilot valve assembly to ensure the actuator moves to the exact position required by the input signal. This closed-loop mechanical feedback system overcomes valve stem friction and unbalanced fluid forces, ensuring stable and repeatable process control.
Flexible Cam Design: One of the hallmark features of the AV1 is its replaceable and adjustable cams. By changing or reorienting the cam, the user can modify the relationship between the input signal and the valve position (e.g., linear, equal percentage, or quick opening), allowing for custom tuning of the control loop.
Simplified Field Calibration: The AV1 is designed with maintenance in mind. Zero and span adjustments are purely mechanical and easily accessible under the cover. This allows for quick field calibration using standard hand tools without the need for electronic configurators.
Rugged Construction for Harsh Environments: The housing is constructed from heavy-duty materials capable of withstanding the vibrations, extreme temperatures, and corrosive atmospheres typical of chemical plants and refineries. The internal components are protected by a gasketed cover to ensure long-term reliability.
Versatile Mounting Options: The AV1 is highly adaptable and can be mounted on a wide variety of actuators. Whether you are using a sliding-stem (linear) diaphragm actuator or a quarter-turn (rotary) piston actuator, the AV1 can be configured with the appropriate mounting kit and feedback linkage.
Fast Response and High Air Capacity: The pilot valve design provides high air delivery and exhaust capacity. This results in rapid responsiveness to large step changes, allowing the valve to reach its new setpoint quickly while maintaining ultra-fine control for small adjustments.
Technical Properties
Operation: Pneumatic-to-pneumatic (P/P) positioner.
Input Signal: Standard pneumatic ranges (e.g., 3 to 15 psig or 0.2 to 1.0 bar).
Output Signal: Supply pressure up to 145 psig (10 bar) depending on model.
Action: Field-reversible (Direct or Reverse action).
Linearity: Less than 1.0% of span.
Hysteresis: Less than 0.5% of span.
Air Consumption: Low steady-state consumption for energy efficiency.
Ambient Temperature: Standard range -40 to 82°C (-40 to 180°F).
The ABB AV1 is the ideal choice for purely pneumatic control systems or in areas where explosion-proof electronic equipment is cost-prohibitive.
Primary Industries and Uses:
-
Power Generation: Control of dampers and large valves in older pneumatic boiler control systems.
-
Chemical Processing: Reliable positioning in hazardous zones where non-electrical equipment is preferred.
-
Pulp and Paper: Managing steam and water flow on high-vibration machinery.
-
Oil and Gas: Localized control for remote utility stations.
-
Mining and Metals: Durable control for heavy-duty process valves in dusty or abrasive environments.
