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Topic: Needle valve

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	Needle Valve, Needle Stainless Steel Valve, Valves, Bronze Needle Valves (Site not responding. Last check: 2007-10-29)
		Needle valves have a narrow tip at the end of the valve stem that is lowered through the seat to limit the flow.
		Needle valves are applied to regulate flow into delicate gauges, which may be spoilt by sudden increase of liquids under pressure.
		Needle valves are also adopted in conditions where the flow must be slowly halted, and at other times where accurate adjustments of flow are necessary or where a small flow rate is preferred.
	www.industrialvalvesindia.com /needlevalves_need.htm (247 words)

	[No title] (Site not responding. Last check: 2007-10-29)
		The needle valve biasing feature further functions for creating a fuel pressure bias opening force on the needle valve element which biases the needle valve element toward the open position and for increasing the fuel pressure bias opening force as the needle valve element moves from the open position toward the closed position.
		Needle valve element 16 also includes a valve seat portion 26 positioned at an inner end for sealingly engaging a valve seat 28 formed on injector body 12 when needle valve element 16 is in the closed position as shown in FIG.
		Needle valve element 16 is biased into the closed position by a bias spring 32 positioned in a spring chamber 34 formed between outer guide portion 24 and inner guide portion 30.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/75296.011011&ELEMENT_SET=DECL (5100 words)

	United States Patent Application: 0040050973
		The needle valve 50 is maintained in the closed disposition by the bias exerted by the needle valve return spring 52.
		The needle valve 50 closes under the combined force of the pressure in the pressure chamber 116 acting on the closing pin 102 and the needle valve return spring 52a.
		Since the opening of the needle valve 50 must act against a certain fluid pressure, opening motion of the needle valve 50 is opposed by needle valve return spring 52 and damped by the action of high pressure fuel residing in the spring cage 68 acting on the spring seat 62.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040050973".PGNR.&OS=DN/20040050973&RS=DN/20040050973 (6276 words)

	Multiple sample needle valve - Patent 4421123
		The valve is a cup valve which utilizes an annular spike arrangement adjacent the bottom of the skirt of the valve for enhancing the sealing effects thereof.
		In addition, the pedestal-like internal support for the valve is configured to reduce the degree of deflection inwardly of the skirt of the valve, upon opening, which reduction has the effect of reducing the degree of convolution of the circumferential extent of the skirt during the deflection.
		On the side of valve body 12 opposite the skirt, the valve member includes a flattened annular projection 16 which is positioned equi-laterally of the axis 13 of the valve of the invention, and includes a flat surface 22 which is connected to body portion 12 by a tapered wall 24.
	www.freepatentsonline.com /4421123.html (3239 words)

	Needle Valves
		The Leybold valve is mainly used at UHV chambers and there it should be the right one.
		The best needle valve I know is made by squeezing a hardened copper capillary (1 mm id and 3 mm od) between a brass plate and a brass wedge.
		By the way, one of the main reasons of existance of this valve is that does not allow for fractionation (isotopic or otherwise) to arise because of the (molecular) flow out of the narrow orifice like a normal needle valve would instead allow for.
	www.qub.ac.uk /mp/ampr/figures/mdrep2.htm (1498 words)

	Carburetor Float Needle Valve (Site not responding. Last check: 2007-10-29)
		This valve is opened and closed by the float, which moves up and down in the bowl of the carburetor, just like the float in a toilet tank.
		When the carburetor bowl is full of gasoline, the float moves up and closes the float needle valve, which in turn closes off the flow of gasoline into the carburetor from the fuel pump.
		Sometimes (rarely) the float needle valve sticks in the closed position (needle valve stuck up in the valve body), effectively preventing fuel from entering the carburetor and from there proceeding into the intake manifold and the cylinders, bringing the car to a complete halt.
	www.geocities.com /vwresource/float_needle (565 words)

	CO2 Controller Needle Valves and Solenoids
		The valve, which by the way is not refered to as a needle valve, but rather as a metering valve, so I suggest that when people go to by a valve from a valve and fitting company, they might have better luck finding the right sort of valve by asking for a metering valve.
		For instance, the Cv of a Nupro M series valve is 0.03 which correlates to a flow of 1.2 cubic feet per minute at an inlet pressure of 35 psig.
		Usually a needle valve is used, but this is not very reliable, since a needle valve is not designed to regulate pressure, but flow.
	www.thekrib.com /Plants/CO2/solenoid.html (9995 words)

	ATV News ATV Forum: Still can figure out what my hondas FU**EN problem is.......
		Since the float, needle valve and needle valve seat are the only things that control the level of the fuel in the float bowl, it has to be one of those.
		along the fuel route to the needle valve, or the seat is not sealed properly in the carb body.
		The needle valve is the little silver part that opens and closes when the float raises/drops.
	www.atvnews.com /forum.cfm/fuseaction/thread/tid/14984501.cfm (701 words)

	End-of-Tank CO2 Dumping
		The needle valve, also known as a fine metering valve, provides a tiny gateway through which the gas is metered out.
		The needle valve does that rather well, if the shape of the aperture is such as to be highly turbulent at the terribly low flow rates we demand.
		Needle Valve Specs and Selection: When I look at the spec sheets of various needle valves, I see things like Maximum Working Pressure, Flow Coefficient (Cv) and Stem Taper Angle and whether or not the valve is capable of cutting off the flow of gas completely.
	www.thekrib.com /Plants/CO2/dumping.html (12133 words)

	Co2 accessories
		GANG VALVE 3 MANIFOLD This is for splitting co2 from one regulator to 3 aquariums.
		Needle valve for CO2 1/4 inch MPT by 1/4 inch Speed tight tubing connection.
		Needle valves are used for the fine adjustment of flow of CO2 gas.
	www.jbjnanocube.com /contents/en-us/d31.html (1767 words)

	Needle Valves (Site not responding. Last check: 2007-10-29)
		Three decades of valve research, design, and manufacturing experience have gone into developing a needle valve for the new millennium.
		The Balon needle valve is the result of many design inputs directed at a total solution to needle valve problems, rather than at one or two isolated and limited variations of outdated concepts.
		Perennial problems which have plagued needle valve users - such as premature seat failure and consequent leakage, internal contamination and wear, bonnet and stem blow-out hazards, and generally abbreviated service life - have all been attacked in the design of the Balon needle valve.
	www.balon.com /prod03.htm (160 words)

	Needle valve, V2 and P2 (Site not responding. Last check: 2007-10-29)
		The needle valve is also extremely tight when closing it, and the cylindrical surface has been machined to provide a non-slipping, but potentially tissue damaging grip.
		The extent to which the needle valve is open/closed is given by the position of the micrometric screw on the threaded rod, and can be determined by counting the number of circles visible above the screw.
		You are in no way encouraged not to follow the guidelines of Bruker, but standard practice has been to continue long term operation with parameter values similar to those used by the Bruker people installing the magnet.
	www.nmrfam.wisc.edu /~blad/hefill750/nvalve_V2_P2.html (382 words)

	Needle Valves
		This valve was unable to reduce the flow of CO2 to a suitable level at any output pressure from the regulator.
		That valve was also incapable of reducing to flow to anything close to the required bubble count, so I went back to the Wal Mart special.
		When I ordered the valve, the person on the phone seemed very evasive as to whether the valve would actually reduce the CO2 flow to 6 bubbles a minute unless it was used with one of their regulators.
	members.tripod.com /~andygags/valves.htm (1045 words)

	Model Airplane News: 2-needle, 2-speed engines and more
		With the escapement-actuated control lever (6) in the down position, the clapper valve* (5) moves to the rearward position, allowing air to pass through a tube (3) to the low-speed needle valve (1), interrupting its fuel flow.
		At the same time, the clapper valve (5) has a sealed tube (4), so fuel flows through the delivery line (7) to the high-speed needle valve (2) that is adjusted for peak rpm.
		Sadly, when the tank was full, this arrangement required that the high-speed needle valve be set very rich, and this robbed the engine's power for the hand-launch takeoff; leaning the mixture usually produced ahot (lean) engine run or flameout as the tank emptied.
	www.findarticles.com /p/articles/mi_qa3819/is_200306/ai_n9267361 (1427 words)

	Plastic Needle Valves suit general-purpose metering., Specialty Mfg. Co., The
		With virtually thousands of end-configuration options, this versatile needle valve may be used in most general purpose metering applications including air, water, and chemical.
		The 586-Series Needle Valve is available with a 2.5 Degree Standard Tip and is also produced with 5 Degree or 45 Degree Tip.
		May 18, 2004 - Needle Valves are constructed of stainless steel.
	news.thomasnet.com /fullstory/467266/rss (708 words)

	NASIOC - Needle valve instead of restrictor hose observations
		If you have the valve set at a setting that allows the same amount of air pass through as the factory restrictor, the car will run identical with the valve as it does with the restrictor.
		I understand that the needle valve was adjusted to a size between the stock's and that of T.XS's, but it is still restricted comparing to stock's and the boost charateristic will be messed up.
		One other thing - I liked the Bimba valve but the valve I used has the Viton seals in it already even though it is rated at the same 200 degrees F of the Bimba valve.
	forums.nasioc.com /forums/showthread.php?t=116094 (1880 words)

	A DIY CO2 system
		This valve takes the CO2 down from the low pressure output of the reactor, and allows you to adjust it down to just a few bubbles per second.
		Valves that can control to that precision are expensive (over $50.00).
		They sell it as a "precision needle valve", and the cost is $19.00.
	www.csd.net /~cgadd/aqua/diy_co2rig.htm (1350 words)

	"Low-pressure" CO2 system
		The needle or metering valve does not prevent output flow from increasing as the tank pressure decreases.
		The Eheim diffuser! Even with the needle valve, adjustments are not immediate due to pressure in the line (I assume). In order to reduce flow rate I need to make a small adjustment with the needle valve and then check it later when the line pressure reduces.
		Victor 253D regulator (single stage; two gauges) with Nupro M Series metering valve followed by two Eheim diffusers (better diffusion is a large tank). I use a 20# bottle for this setup. Output pressure of the regulator is set to 40 psi.
	www.geocities.com /bwe407/lowpressure.html (2714 words)

	HomeRepairForum.com - needle valve evaporative cooler (Site not responding. Last check: 2007-10-29)
		What the heck is a needle valve and, now that it is installed, do I need to adjust it or does it do that automatically?
		No that is not the type valve you would use on a washing machine.
		A T handled valve that foes over copper tubing and fastens in place with two screws and a gasket on the upper half.
	homerepairforum.com /forum/topic.asp?TOPIC_ID=2886 (301 words)

	Needle Valves are constructed of stainless steel., Winters Instruments (Site not responding. Last check: 2007-10-29)
		Needle Valves are constructed of stainless steel., Winters Instruments
		Winters Stainless Steel Needle Valves are constructed of 316 stainless steel or carbon steel.
		Winters Stainless Steel Needle Valves are commonly used in refineries, liquid petroleum gas, processing plant systems difficult to shut off due to solid contents such as dust, rust, dirt, etc. For more information on Stainless Steel Needle Valves, please visit the website at www.winters.com, or contact Winters Instruments at marketing@winters.com.
	news.thomasnet.com /fullstory/451739/rsi (708 words)

	TITAN CC Series Continuous Centrifugals (Site not responding. Last check: 2007-10-29)
		The needle valve is an infinitely variable orifice which can be quickly changed to compensate for varying feed stream viscosities and head to maintain a consistent feed to the centrifugal.
		Automatic motor load monitoring and adjustment of the variable needle valve is provided by a pneumatic operator and programmable control.
		The needle valve feed system is an infinitely variable orifice which can be quickly changed to compensate for varying feed stream viscosities and head to maintain a consistent feed to the centrifugal.
	www.westernstates.com /contin/cc2.htm (378 words)

	Engine break-in procedures
		The "turns" on the needle valves are general settings.
		Your first tank of fuel should be running the truck at a very rich high-speed needle valve setting.
		Once the engine is started, open the high-speed needle valve around 1/8 turn at a time, finding the setting where the engine just barely runs.
	www.webspawner.com /users/ryansrcpage/enginebreakinpr2.html (473 words)

	Valves - Mini Spool Valve - CAMMDA Corporation
		Material path is disposable, simplifying the task of cleanup and maintenance and making it an excellent choice for dispensing difficult materials.
		Slide Tube Technology™ has lead to the development of this small lightweight dual component dispensing valve.
		The small physical size and weight of the valve makes it ideal for robotic applications.
	www.cammda.com /products/valves/valves.html (265 words)

	Pro-Lock Valve Lockout - Gate, Ball, Butterfly, Audco, Needle Valves
		Ideal for the isolation of most types of valves, industrial machinery, and many other items, Pro-lock is molded from Atofina PPC 9760, an impact copolymer polypropylene.
		Originally designed as a cost effective solution, to lock any type of valve in aggressive offshore environments, Pro-lock is tough and extremely versatile, Function testing has been carried out between -55degC and +55degC with no noticeable reduction in performance.
		Ball valve locking pins can be supplied to prevent movement and to enable the secure locking of those ball valves, that don't have a drilled valve handle through which to secure the cable.
	www.pro-lock.co.uk (545 words)

	tubing, manifolds, needlevalves and other accesories click here
		Ultimate high precision needle valves with locking nut to secure adjustment.
		Triple edged brass hose barbs, which have such a tight fit the tubing has to be cut away to remove.
		Half of one psi is all that is needed to pass thru.
	www.aquabotanic.com /abstore/en-us/dept_19.html (328 words)

	Century Valve, valves, instrumentation, needle, gauge, root, manifolds
		Century Valve, located in Calgary, Alberta, Canada, manufactures a complete line of instrumentation valves.
		Century Valve's Needle, Gauge, Root and Instrument Manifolds are in service throughout the world and are known for exceptional quality, performance and reliability.
		Century Valve incorporates stringent quality assurance procedures at all levels to ensure customer satisfaction and operator safety.
	www.centuryvalve.com (150 words)

	Co2 accessories
		These units come with their own check valve.
		Non-return valve for CO2 hoses and air hoses.
		Also comes with individual needle valves for precision tuning.
	www.power-compact-lights.com /contents/en-us/d31.html (551 words)

	Needle Valve Installation - Intlwaters Community Forum
		Can anyone tell me if it make any difference which way the high speed needle valve is installed.
		Currently I have the tank line into the side of the needle and the feed for the carb out of the bottom of the valve in line with the needle.
		I assume that you are talking about a remote needle valve.
	www.intlwaters.com /index.php?showtopic=1064 (187 words)

	Superior Specialty Mfg. 586 needle valve, needle valves (Site not responding. Last check: 2007-10-29)
		The 586 Series Needle Valve compact design promotes multiple configurations to fit the exact end use application.
		The 586 Needle Valve Series is rated to 125 psi and has a 2.5 Degree Tip.
		SMC Part Numbers are a description of the valve as read left to right, Inlet to Outlet.
	www.specialtymfg.com /needle_valves/586_needle_valve (170 words)

	Excel Hydro-Pneumatics - Typical Barstock Needle Valve (Site not responding. Last check: 2007-10-29)
		For smooth valve operation, the stem threads are cold rolled to achieve maximum strength, coupled with fine surface finish and high accuracy.
		When tightened firmly, it ensures that the upper gland body is positively locked to prvent any further movement during vibration and temperature changes.
		Valve bodies are precision machined to close tolerances.
	www.excelhydro.com /pg2.htm (197 words)

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