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.

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.

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.
References in periodicals archive ?
A new needle-drive unit for hot-runner valve gates is said to overcome several limitations common to single-shot needle valves.
New techniques employ self-calibrating needle valves to eliminate significant back pressure on the gas supply unit, thus avoiding conditions of choked gas flow.
Kandl said that, in addition to a needle valve, the redesigned regulators are available with a packless diaphragm.
The current operating status of each needle valve nozzle is indicated on the screen by a bar display (green = open; red = closed).
Tenders are invited for Needle Valve 1/4 Inches And Window Wiper Valve.
The regulator also features a built-in lubricated needle valve that provides easy control of flow volume.
Limited Tenders are invited for Ss-316, Needle Valve & Brass Needle Valve
It includes the "LI" lightweight internal-mix gun, which has a needle valve to permit adjusting catalyst and resin pressures to matching levels.
The xQR41 Series MicroDot needle valve, introduced in June, features a 60% smaller form factor, an exchangeable modular design for greater customization and process control, and a Quick Release (QR) clasp that allows easy removal of the fluid body to replace wetted parts in seconds.
Tenders are invited for Wiper Control Valve Lever With Needle Valve Type , M-S.
Valve offerings include inert isolation valves, solenoid operated valves, valve actuators, pinch valves, manifold valves, ball valves, globe valves, butterfly valves, needle valves, and miniature and subminiature valves.