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4/2
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A quality of a directional control valve that indicates the valve has four ways, four ports, and two positions.
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aerosol lubricator
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An adjustable lubricator that continuously introduces a fine oil mist into a pneumatic circuit.
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air treatment
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The process of preparing air for a pneumatic system. Air treatment usually involves filtering for contaminants, regulating for pressure, and lubricating for ease of component movement.
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cam
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A circular device attached to the end of a cylinder rod. When it contacts a valve, the cam causes the valve to actuate.
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cap end
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The side of the piston that is opposite the rod. The cap end is also called the blind end.
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directional control valve
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A fluid component that determines the path air takes in a pneumatic system. Directional control valves are used to move actuators into various positions.
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double-acting cylinder
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A pneumatic actuator that directs pneumatic energy in two directions.
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dual palm button
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One of a pair of separate buttons that must be pressed simultaneously in order to power a stamping press. Dual palm buttons are considered safeguarding devices.
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extension
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The movement of a cylinder characterized by air pushing on the piston and moving the rod outside of the cylinder housing.
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filter
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A screen used for limiting contamination by trapping very fine and fine particulate matter and separating this matter from air. A filter is a component of an FRL.
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filter-regulator-lubricator
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FRL. A device that conditions air for use in a pneumatic system.
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flow control valve
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A fluid component that controls the rate of air flow. Flow control valves make it possible to control other system variables like the speed of an actuator.
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FRL
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A device that conditions air for use in pneumatic systems. An FRL is a combination filter-regulator-lubricator and is also called a trio.
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injection lubricator
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A lubricator that periodically places a small amount of oil in a particular area of a pneumatic circuit.
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leakage
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The unintended movement of fluid either out of a fluid system or from one fluid component to another. Leakage causes a loss of effiency and often leads to system failure.
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limit valve
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A directional control valve that restricts or otherwise changes the movement of another component when actuated.
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logic
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The unique configuration of a pneumatic circuit that involves placing components properly to perform work.
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lubricator
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A component that releases oil into certain portions of a pneumatic system to lubricate moving parts. A lubricator is a component of an FRL.
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normally closed
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A valve position in which the valving element is unactuated and covering a port. A normally closed valve opens when it actuates.
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normally retracted
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A cylinder position in which the piston is retracted when the valving element is unactuated. A normally retracted cylinder extends when the main directional control valve actuates.
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Occupational Safety and Health Administration
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OSHA. A government agency under the U.S. Dept. of Labor that helps employers reduce injuries, illnesses, and deaths in the workplace.
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position
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The number of physical settings on a directional control valve. A three-position valve can be placed in three different physical settings with a control such as a lever.
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regulator
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A pneumatic device that monitors the pressure level of the air sent to downstream components. A regulator is a component of an FRL.
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retraction
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The movement of a cylinder characterized by air exiting the cylinder and the rod moving into the cylinder housing.
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rod end
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The side of the piston that is attached to the rod.
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shuttle valve
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A control valve that regulates the supply of air from more than one source into a single area of the circuit.
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silencer
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A component that muffles noise caused by air exhausting from a pneumatic system.
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single-acting cylinder
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A pneumatic actuator that directs energy in one direction.
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spring-centered
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Situated by a mechanism that keeps a directional control valve in the center locked position unless the valve is actuated into the first or third position.
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trio
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A device that conditions air for use in pneumatic systems. An FRL is a combination filter-regulator-lubricator.
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way
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A characteristic of a valve that indicates how air can flow through it.
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