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H6 - Federal Item Name Directory
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11061
VALVE,SEATLESS
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FIIG: A046B0
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Entry Date: Apr-01-1974
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Concept: 1
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Status: A
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Applicability: AQ
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Type: 0
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Definition: A valve that controls flow by a cylindrical piston sliding vertically through packing rings separated by a metal cage having ports through which flow may proceed when the valve is open. Rotation of the threaded stem is used to regulate the position of the piston. See also VALVE, PLUG and VALVE, WEIGHTED CONTROL, PISTON.
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Basic INC: 70646
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Basic Name: VALVE
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Description: 1. A mechanism designed to control the flow of liquids or gases either within a closed system such as a pipeline or between the atmosphere and a closed system. It may be manually and/or power operated, actuated by predetermined pressure and/or temperature, or a pressure and/or temperature differential. Excludes: FAUCET (as modified); COCK (as modified); and THERMOSTAT (as modified).
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Corresponding NIINs: 53
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