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Valworx Air Actuators

Air actuators, also called pneumatic actuators, open and close the valve using compressed air. In a rack & pinion actuator, high pressure air acts on a piston which is connected to a toothed bar (the rack). As the piston/rack moves, the rack engages with a splined shaft (the pinion) to produce rotary motion. Air is controlled by a central valve bank or by a pilot solenoid valve mounted directly to the actuator. Air actuators air available in either double-acting or spring return models. Double acting actuators use compressed air to both open and close the valve, whereas spring return actuators us air to open the valve and compressed springs to return the valve to the closed position. (Alternatively, the valve assembly can be set so the springs return the valve the open position, ie a “fail open” configuration.) Rack & pinion actuators are simple, reliable and lower cost than electric actuators. Their main drawback is they require a source of compressed air which usually makes them unsuitable for field or remote applications. Some features that differentiate higher quality rack & pinion air actuators include a hard-anodized aluminum body, a weatherproof enclosure (usually IP67/ NEMA 4X or higher), and pre-configured mounting points for positioners and solenoid valves. https://www.valworx.com/category/5300...