| Air blow guns attach to air lines for the
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| | threads per inch (TPI) and outside
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| manual actuation and/or control of air
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| | diameter (OD). 1/8” NPT connectors have
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| discharge. They are used primarily for
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| | 27 TPI and an OD of 0.405”. 1/4” NPT
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| debris removal and purging, non-contact
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| | connectors have 18 TPI and an OD of
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| part cleaning and drying, and general
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| | 0.540”. 3/8” NPT connectors also have
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| laboratory or industrial applications.
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| | 18 TPI, but an OD of 0.675”. 1/2”
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| Most air blow guns are made of plastic or
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| | connectors have 14 TPI and an OD of
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| metal and include an ergonomic grip or
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| | 0.840”. #10-32 NPT threads are also
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| handle. A steady stream of compressed air
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| | available. Air line connections that can
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| is delivered through a sturdy metallic
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| | swivel or pivot are suitable for
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| nozzle. Air blow guns that are equipped
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| | applications that require versatile
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| with an internal fail-safe pressure
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| | positioning.
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| mechanism shut off automatically if the
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| | Air blow guns vary in terms of nozzle
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| gun is dropped or the lip is blocked.
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| | type and actuation style. Standard safety
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| Integral pressure relief valves are used
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| | nozzles are suitable for general-purpose
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| to blow off excess pressure before
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| | applications. Small-diameter nozzles can
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| discharge. In the United States, products
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| | be inserted into tight openings. Nozzles
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| that meet or exceed standards from the
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| | with rubber tips prevent the marring of
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| Occupational Safety and Health
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| | surfaces while nozzles with flexible tips
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| Administration (OSHA) are commonly
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| | can be guided directly to the application
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| available. Typically, manufacturers
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| | point. Air blow guns with extended,
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| indicate whether products are suitable
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| | straight nozzles provide longer reach.
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| for high volume applications, or include
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| | Devices with extended, angled nozzles are
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| a threaded discharge port or vacuum
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| | designed for use in difficult-to-reach
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| attachment.
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| | locations. Venturi nozzles contain small
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| Specifications for air blow guns include
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| | holes that allow the discharge to draw
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| pressure capacity and air line connection
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| | ambient air to increase the airflow. Air
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| type. Pressure capacity or maximum rated
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| | screens are often used to minimize
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| pressure is rated at the air inlet and
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| | particle blowback. In terms of actuation,
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| measured in pounds per square inch (psi).
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| | most air blow guns include a discharge
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| Many types of air line connectors are
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| | lever that is in-line with the air hose
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| available. Quick-release connectors
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| | and actuated by thumb. Pistol or
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| contain fittings that are attached
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| | trigger-style devices are also available.
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| internally. By contrast, push-on
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| | With these devices, the actuator is
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| connectors include barbed ferrules. Air
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| | located at a right-angle to the air
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| blow guns use several types of national
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| | supply hose and incorporates an ergonomic
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| pipe thread (NPT) connectors, most of
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| | handle. Button-actuated air blow guns are
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| which are inch-based and female.
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| | also available.
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| Important NPT measurements include
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