SynC · Topic
Actuators
These are the standards in SynC Standards that cover Actuators. Each one is a complete, plain-language specification: the scope it applies to, the requirements that govern it, and a structured equipment datasheet listing the values a project has to decide, with the standards each is verified against. All of it is written and maintained by SynC, free to read without an account, and published under CC BY 4.0.
A standard usually carries several topics, so most of the entries below also appear under neighbouring subjects. The topics each one carries are listed on its own page.
Standards
- Air Terminal Units
Factory-fabricated air terminal units that meter primary air from a central air system into an individual thermal zone in commercial, institutional, healthcare, and industrial buildings. Covers single-duct, dual-duct, and bypass metering arrangements; variable-volume and constant-volume airflow control; pressure-independent and pressure-dependent control basis; parallel and series fan sections; hot water, steam, and electric reheat with their valves, actuators, and safety devices; casing construction and acoustic treatment; primary damper and actuator; primary airflow sensing; radiated and discharge sound; the zone controller, zone sensor, and building automation interface; factory testing; installation; and field airflow, functional, and acoustic verification.
- Control Valves and Actuators
The automated final control element of a process control loop — modulating (throttling) control valves and the actuators and positioners that drive them — for industrial, process, and water/wastewater (WTP/WWTP) facilities. Covers globe, segmented-ball, eccentric-plug, and butterfly valves used for modulating control; pneumatic spring-diaphragm and piston actuators and electric actuators sized for continuous modulating duty; analog, HART, and digital/fieldbus valve positioners with diagnostics; and accessories (I/P transducers, solenoid valves, limit switches, position transmitters, volume boosters). Addresses valve sizing and flow-coefficient (Cv) selection per ANSI/ISA-75.01.01 / IEC 60534-2-1, inherent flow characteristic (linear, equal-percentage, quick-open), rangeability, choked flow, cavitation and flashing with anti-cavitation trim selection, predicted noise, fail-safe action (fail-open, fail-closed, fail-last), seat leakage class per ANSI/FCI 70-2, materials and trim, and stroke/calibration. Also covers electric (motorized) actuators on isolation valves (MOVs) where the actuator is the controls interface — open/close or modulate with position feedback to SCADA — because the actuator is I&C scope even when the valve body is an isolation valve.
- Louvers and Dampers
Stationary exterior and interior louvers and the full range of air-control and life-safety dampers in commercial, institutional, and light-industrial buildings. Covers drainable-blade, storm-resistant (wind-driven-rain), sand-trap, acoustic, combination louver/damper, and penthouse/gooseneck louvers selected by free area and water-penetration class at the design intake velocity; air-control dampers (parallel- and opposed-blade) selected by AMCA 500-D leakage class; backdraft, gravity, and pressure-relief dampers; and the life-safety dampers required at rated barriers — fire dampers (UL 555), smoke dampers (UL 555S), combination fire/smoke dampers, and ceiling radiation dampers (UL 555C) — together with actuators, fusible and resettable links, sleeves, retaining angles, access, and the firestopping interface. Includes hurricane-zone (AMCA 540 / 550) and Florida/High-Velocity-Hurricane-Zone louver requirements and the AMCA Certified Ratings Program basis for ratings.