Rotary motion valves (rotary valves) such as ball, plug and butterfly valves that rotate through a quarter-turn (90 degrees) or more from open to close. This includes multiturn valves.
Linear motion valves (linear valves) such as gate, globe, diaphragm, pinch, and angle-style valves have a sliding stem design that pushes the closure element open or closed. The valve stem may rise while rotating (multi-turn) or may rise without rotating.
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Throttling valves regulate the flow, pressure or temperature of the service. They can move to any position within the stroke of the valve and hold that position, including full on or full off. The addition of an actuator to a throttling valve, which has the ability to adjust to a signal, is called a control valve. An actuator used in throttling or modulating service is part of the control loop consisting of a sensing device, controller and an actuator mounted on a valve. The actuator receives a control input signal from the controller or positioner and adjusts closure element position accordingly.
The input control signal to the actuator is a pressure signal.
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A splined or slotted lever attached to the valve shaft to transfer the linear motion of diaphragm or piston cylinder actuators to rotary motion.
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Constructed for indoor or outdoor use. Provides a degree of protection against contact with enclosed equipment, falling dirt, rain, sleet, snow and windblown dust, splashing water and hose-directed water. Undamaged by external formation of ice on enclosure.
Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, hose-directed water, and corrosion; and that will be undamaged by the external formation of ice on the enclosure.
Enclosures constructed for indoor use in hazardous locations classified as Class II, Division 1, Groups E, F, or G as defined in NFPA (National Fire Protection Agency) 70.
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For manual actuators, clockwise rotation of the actuator causes clockwise rotation of the valve to close. For other types of actuators, increasing control input signal extends the valve stem.
For manual actuators, clockwise rotation of the actuator causes counterclockwise rotation of the valve to close. For other valve types, increasing control signal input retracts the valve stem.
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Travel stops or limit stops, as they are also called, are a device in an actuator that restricts or limits the linear or rotary motion of an actuator. Limit stops may be adjustable or fixed.
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The actuator has an electromechanical limit switch (contacts) or a non-contact proximity sensor that allows the position / status of the actuator to be monitored from a remote location using proper connections. Usually the signal (or lack of a signal) generates some action in the process.
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This is the full required range of ambient operating temperature.
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