Pneumatic actuators
Обзор
Spirax Sarco pneumatic actuators provide linear valve actuation for control duties where compressed air remains the preferred power source for responsiveness, fail-safe action and straightforward integration into established plant control schemes. The PN9000, PN5700 and PN6700 diaphragm ranges, together with TN2000 cylinder actuators, cover different thrust and differential pressure requirements so the actuator can be matched to the installed valve and the real process load. Mechanical travel indication helps operators verify stroke position visually, while the actuator geometry supports stable valve movement and good linearity across the working range. Pneumatic actuation remains a practical choice where users want fast response, simple fail positioning and compatibility with smart positioners or existing instrument air infrastructure rather than a fully electric package. These actuators are commonly paired with SPIRA-TROL, QL and other Spirax Sarco two-port and three-port control valves, making this route useful when the project calls for a complete air-powered control valve assembly rather than an actuator in isolation.
Pneumatic actuators are usually selected as part of a larger valve package. Match them with steam control valves when the main issue is the modulating assembly itself, and use valve positioners where tighter signal tracking or diagnostics are needed.
If the plant is reconsidering whether air power is necessary at all, compare electric actuators.