Actuators
3 in-depth engineering guides on Actuators — specification, selection, testing and procurement.
Everything on Actuators
Vajra's engineering team has published 3 technical guides covering Actuators for industrial valve selection, specification, testing and procurement. Browse the full set below.
Valve Actuator Fail-Safe Action: Fail-Closed, Fail-Open, and Fail-Last
Fail-safe action defines what an actuated valve does on loss of power or signal: move to closed, move to open, or stay in place. Choosing the correct fail direction is a fundamental process-safety decision. This guide explains fail-closed, fail-open, and fail-last actuation and how to select the right one.
Valve Positioner Types & Selection Guide - Pneumatic, Electro-Pneumatic, Digital
Valve positioners ensure control valves reach exact positions despite friction and pressure forces - this guide covers all positioner types from simple pneumatic to digital HART and Foundation Fieldbus.
Butterfly Valve Actuator Torque Sizing - Breakaway, Running, and Seating Torque
Incorrect actuator torque sizing causes valve failures - too small and the valve won't open; too large and it damages the valve stem. This guide explains all torque components and sizing factors.
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