ABB V18345-1010221001 TZIDC Electro-Pneumatic Positioner

The ABB V18345-1010221001 is an intelligent TZIDC electro-pneumatic valve positioner configured for single-acting (spring-return) actuators with fail-freeze function and 4–20mA analog position feedback. Single-acting configuration is ideal for spring-diaphragm actuators commonly found in general process control. The fail-freeze mode holds the last position on signal loss, suitable for applications where a sudden valve movement could cause process disruption.

Q: What is the ABB V18345-1010221001?

A: The V18345-1010221001 is a TZIDC intelligent electro-pneumatic valve positioner configured for single-acting (spring-return) actuators with fail-freeze function and analog position feedback.

Q: What is "single-acting" vs "double-acting"?

A: Single-acting positioners output air pressure to only one side of the actuator (the other side uses a spring to return). This is common in spring-diaphragm actuators. Double-acting positioners control both sides of a piston actuator for higher force applications.

Q: How does this differ from the V18345-1010421001?

A: The 1010221001 is single-acting with fail-freeze and no ATEX certification. The 1010421001 is double-acting with fail-safe and ATEX Ex ib IIC T6 certification. The two models serve different actuator types and safety requirements.