Valves & Valve Actuators

Electric actuated valves use electric actuators to drive them open and closed. Electric valve actuators typically convert high speed low torque output motors into low speed high rotary torque output that drives the valve via a gearbox. The most common electric valves are electric actuated ball valves and electric actuated butterfly valves, although electrically actuated gate valves or sluice valves are often used in larger pipe sizes. There are many uses of valves – mainly controlling the flow of fluids and pressure.
The Triac DC modulating card (4-20mA input) can be used with the Triac E-Series DC powered actuators. The TRIAC® FSE Series spring return electric failsafe actuator features a reliable clutching mechanism for spring failure. This spring engagement mechanism design provides for extended cycle life. As your thermal utility partner, Armstrong can satisfy your industry’s most unique requirements while helping you improve efficiency and reduce energy consumption and emissions.
Before putting it into operation, let the fluorine-lined electric control valve be fully opened, and the medium will flow for a period of time before being brought into normal operation. Pneumatic valve actuators require a source of pneumatic pressure in order to operate. The pressure can come from the natural gas available on most upstream oil and gas sites, or from air compressors. The power source must be capable of supplying the proper voltage and current required by the electric actuator to operate the valve. An electric actuator may be required to operate the valve as an open/close or modulating actuator; make sure the actuator is manufactured and supplied according to the required specifications.
For example, the solid particles in the medium or the welding slag and rust that are washed away from the pipeline cause blockage, jamming, and other failures due to the failure of the orifice. You can switch to throttle with a large throttle gap—the throttle area is open. Valve cores and sleeves such as windows and openings, because their throttling area is concentrated rather than distributed on the circumference, the fault can be easily eliminated.
Pressure is typically modulated between 20.7 and 103 kPa to move the valve from 0 to 100% position. In van samyang of the valve stem or shaft is compared with the position of a bellows that receives the pneumatic control signal. The beam pivots about an input axis, which moves a flapper closer to the nozzle. The nozzle pressure increases, which increases the output pressure to the actuator through a pneumatic amplifier relay. The increased output pressure to the actuator causes the valve stem to move.

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