ABB Pneumatic and electro-pneumatic positioners AV2
A mechanical connection from the actuator to a position feedback cam in the positioner 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.
An optional manifold assembly provides an integral
shutoff and equalizing valve. This isolates the positioner
from a double-acting actuator (with manual override)
without removing the positioner from the process. The
manifold also provides disposable filter cartridges that
insure fast servicing and minimum downtime. Manifolds
also contain three gage ports for mounting one instru-
ment and two output gages. A supply gage is available
and 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