needle valve


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needle valve

[′nēd·əl ‚valv]
(mechanical engineering)
A slender, pointed rod fitting in a hole or circular or conoidal seat; used in hydraulic turbines and hydroelectric systems.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

needle valve

A type of globe valve in which the throttling is performed by a tapered pin moving in and out of a conical seat to adjust the fluid flow.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

needle valve

needle valve
A fluid control valve that uses a long tapered needle to finely control the amount of fluid passing through the orifice. The more the needle is in, the lesser is the amount of flow, and vice versa. It can be adjusted as required.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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Some designs contain a metal-to-metal seat seal; consequently, needle valves are a good choice for high-temperature applications.
Matching valve type to function: when selecting a valve, your choices may seem overwhelming. Start by asking the question in valve selection: what do I want the valve to do? Michael Adkins, manager, field engineering group, Swagelok company, outlines considerations for two of the most popular functions of a valve--on-off and flow control. Matching valve type to function is the first and most important step in the valve selection process
A unique arrangement of needle valves regulates the flow of gas.
Overcoming process control challenges of gas-assist injection molding
A new needle-drive unit for hot-runner valve gates is said to overcome several limitations common to single-shot needle valves. Hasco America Inc., Arden, N.C., says these issues include splitting of the melt, which produces weld lines on flat surfaces; large overall installation height; and inaccurate scale-up from single-cavity development molds to multi-cavity production that uses a different nozzle type.
This needle valve leaves no weld lines
Most of the time, the regulators are a needle valve -- a tapered pin that mates to a similar taper in the fitting.
Air cylinder regulation. (Mike Breen on Preventive Maintenance)
"The sliding valve functions similar to a needle valve, but the design eliminates the chance of black specks ending up in the part," says project leader Gerald Birner.
Auto glazing: window of opportunity for molders: this emerging market promises to be big but challenging. Polycarbonate car windows require specialized machinery, high-end processing capability, premium polymers, advanced coating technologies, and innovative mold and runner designs
The Century system is equipped with both height and needle position sensors to maintain consistent needle valve positioning.
STRONGER BONDS
Also new from Manner is a wear-resistant needle valve for abrasive materials.
New hot-runner nozzles, valves & controls
The needle valve is totally contained within the nozzle housing and does not pass through the hot manifold.
This Valve Gate Keeps Its Pin Straight

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