ABB Pneumatic and electro-pneumatic positioners AV1 & AV2
A mechanical connection from the actuator to a position feedback cam in the positioners establishes actual position. Three characterized segments on one cam provide application flexibility by establishing various relationships between input signal and actuator position. The relationships provided by the segments are square root, linear, and square.
Type AV Characterizable Pneumatic Positioners arecontrol devices that satisfy a wide range of applications.They provide fast, sensitive, and accurate positioning ofpneumatic signal or double-acting, linear or rotarymotion actuators.
An optional manifold assembly provides an integral shutoff and equalizing valve. This isolates the positionerfrom a double-acting actuator (with manual override)without removing the positioner from the process. Themanifold also provides disposable filter cartridges thatinsure fast servicing and minimum downtime. Manifoldsalso contain three gage ports for mounting one instru-ment and two output gages. A supply gage is availableand must be piped into the supply line by the customer
The Type AV1 positioners receives an external pneumatic signal and converts it to a pneumatic output. This output produces the motive force that positions the power actuator.
The type AV2 positioners receives an external 4-20mA signal and converts it to a pneumatic output. This output produces the motive force that positions the power actuator