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Topic: Demand valve

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	Diving regulator - Wikipedia, the free encyclopedia
		Valves without the reserve lever are called "K valves" for the same reason; being the next item in the catalog they were denoted by the letter K. Modern divers using "J valves" dive with the reserve valve in the open position and depend on a contents gauge or computer to monitor gas supply.
		The demand valve was invented in 1865 in France, and forgotten in the next few years, and was not invented again until the late 1930's.
		The demand valve could be a hybrid DV and buoyancy compensator inflation valve.
	en.wikipedia.org /wiki/Diving_regulator (2699 words)

	Encyclopedia: Demand valve (Site not responding. Last check: 2007-10-09)
		The demand valve, second stage or DV is the device connected to a low pressure hose from which the diver inhales.
		It consists of a chamber, a valve at the end of the low pressure hose and a mouthpiece, which the diver grips between his or her teeth.
		If there is neither a demand valve nor a pressure relief valve there is a danger the excess gas will free flow to the buoyancy compensator or diving suit resulting in a rapid increase in buoyancy causing a potentially lethal rapid ascent to the surface.
	www.nationmaster.com /encyclopedia/Demand-valve (1076 words)

	Demand valve having reaction load means and an insertable trigger element - Patent 5275153
		The construction of the demand valve permits the gas spaces therewithin to be of small volume, thereby providing for sensitivity and rapid response to demand pressure changes, while avoiding wastage of breathing gas during valve changeover in a breathing cycle.
		The inlet port 21 is connected to a valve chamber 22 housing a spring-loaded poppet 23 engaging a seat 24 surrounding a passage to an outlet port 25 in a reaction chamber 26.
		The valve 37 may be fitted internally with a pressure relief valve to control charging of the air storage bottle with the regulator in situ or to guard against the dangers of excessive stored air pressure rise in the storage bottle.
	www.freepatentsonline.com /5275153.html (1626 words)

	Antiset protector for second stage scuba regulators - Patent 4159717
		A second stage regulator of scuba diving apparatus includes a demand valve for supplying breathable gases to the diver, a diaphragm for sensing the inhalations of the diver, or his demand for breathable gases, and a linkage between the diaphragm and the demand valve for opening the valve in response to demand.
		Breathable gases are conducted to the chamber 14 by the aid of a valve assembly 20 that is mounted by the case.
		The details of the valve assembly are unimportant except that the valve assembly includes a valve seat 26, a resilient closure member 28 and a spring 30 that normally urges the resilient closure into engagement with the seat.
	www.freepatentsonline.com /4159717.html (1735 words)

	Demand valve resuscitator - US Patent 5787882 (Site not responding. Last check: 2007-10-09)
		The invention of claim 6 wherein the relief valve is spring biased and the cam adjusts the force of the spring and thereby the pressure required to open the relief valve.
		The invention of claim 18 wherein the relief valve is spring biased and the cam adjusts the force of the spring and thereby the pressure required to open the relief valve.
		This unit also had a relief valve to limit maximum pressure and an anti-suffocation valve to prevent patient suffocation in the event that the patient was left unattended, the oxygen depleted, and the mask left fixed to the patient's face.
	www.patentstorm.us /patents/5787882.html (4437 words)

	IDA-72 Gas Plenum (Site not responding. Last check: 2007-10-09)
		The demand valve is in the center of the photograph.
		The automatic demand valve is very high performance, as it must also be able to function as a high-volume demand breathing regulator when the rig is selected to "Demand" mode.
		Here's what makes the demand system work: The plate that is visible through the port is in its "relaxed" position, and allows gas to be sucked from the counterlung into the heat-exchanger and then to the diver.
	www.nobubblediving.com /ida72.plenum.htm (489 words)

	Demand valve - Patent 4411285
		A valve as claimed in claim 5, wherein the spigot is threadably engaged with the housing and means are provided to fix the spigot in a chosen position relative to the housing.
		For example, when the valve is employed as a driver's exhaust demand valve, an abutment surface may be provided within the chamber to prevent pivotal movement of the rigid element into the chamber when the pressure of gas within the chamber is reduced, for example, when the diver inhales.
		The valve chamber 17 is provided with a port 20 from which a spigot 21 extends, and with a further port 22 defined by one end of a spigot 23 whose external surface is threaded to engage with a corresponding tapped hole in the housing.
	www.freepatentsonline.com /4411285.html (1886 words)

	Business Economics: Industry corner: a world view of industrial valves
		Valves serve a wide range of industrial applications and are used to control a range of process variables including the rate, direction, volume and pressure of flow.
		Demand is rising for specialized valves and valves with enhanced capabilities to be used in capital-intensive industries.
		Demand for industrial valves is forecast to advance 6.8 percent annually to $11.8 billion in the year 2000.
	www.findarticles.com /p/articles/mi_m1094/is_n2_v32/ai_19545604 (1302 words)

	Decompression buoy - Wikipedia, the free encyclopedia
		The diver removes the primary demand valve from his or her mouth to inflate the buoy, and is therefore at a disadvantage in dealing with any other problems that might arise as the deco buoy goes off.
		Use a sealed buoy with an inflation valve, which is filled by blowing directly into the valve inlet or by attaching a medium-pressure inflation hose from the buoyancy compensator or dry suit.
		The valve does not retain the hose connector, like the BCD or suit inflator valve, and the hose can be easily pulled off the valve when the buoy is sufficiently filled.
	www.wikipedia.org /wiki/Decompression_buoy (574 words)

	Prices rise slightly in healthy market
		As an example, suppliers say that demand in the fourth quarter and early part of the first quarter often is quiet.
		One producer notes that valves are the "canary in the birdcage" and often are the first indication of any economic fluctuation.
		The valve is available in port sizes of.25" to 2.5" N.P.T. with flow rates to 1,100 GPM or 130 scfm.
	www.purchasing.com /index.asp?layout=articlePrint&articleID=CA117323 (1627 words)

	NIOSH / NPPTL / CEL Definitions of Terms
		An apparatus of the type in which the exhalation is rebreathed by the wearer after the carbon dioxide has been effectively removed and a suitable oxygen concentration restored from resources composed of (1) compressed oxygen, (2) chemical oxygen, or (3) liquid-oxygen.
		This means that by design, the control valve cannot be closed completely, or a continually open bypass is provided to allow air to flow around the valve and maintain the required minimum rates.
		Very similar to the demand class except that the regulator admission valve is held slightly open until the pressure in the facepiece reaches a preset pressure point, then closes.
	www2.cdc.gov /drds/cel/def.htm (1326 words)

	Marinox Details
		The inhalation resistance required to operate the demand valve at lower flow rates is also very low.
		demand valve makes operator override unnecessary and whilst the unit does incorporate a test/vent button this is purely for checking the unit prior to applying therapy or venting the system on completion.
		An additional demand valve, available as an extra, may be alternatively coupled to the therapy outlet in lieu of the pocket mask enabling 100% oxygen therapy for 2 patients.
	www.subaqua-products.co.uk /marinox_details.htm (393 words)

	CPR Oxygen Demand Valve / O2 Demand Valves (Site not responding. Last check: 2007-10-09)
		The Oxygen Demand Valve provides trained individuals with a safe and effective means of delivering 100% oxygen, by inhalation, to patients in respiratory distress at the flowrate demanded by the patient.
		Lightweight, portable and extremely durable, the Oxygen Demand Valve is designed for the demands of the pre-hospital and in-hospital environments and can be used anywhere a regulated 50 PSI oxygen supply is available.
		Especially useful in areas where the provision of positive pressure oxygen to patients in respiratory distress/ arrest is not permitted, the Oxygen Demand Valve is a simple method of providing 100% oxygen without the wastage of gas that occurs with free flow oxygen therapy masks.
	www.cpr-pro.com /o2demandvalve.html (174 words)

	Diver's Guide To Oxygen Therapy Equipment (Site not responding. Last check: 2007-10-09)
		Some valves have a cylinder pressure gauge built-in, thus allowing the cylinder pressure to be monitored without having to put on the regulator.
		The bag is separated from the mask by a one-way valve that prevents air and patient exhalation from diluting the oxygen in the reservoir bag.
		There are also one-way valves that cover the holes on the mask to allow patient exhalation to escape without allowing large quantities of air to enter the mask.
	www.mindspring.com /~divegeek/oxdelivery.htm (4498 words)

	Diving regulator (Site not responding. Last check: 2007-10-09)
		The diaphragm operates when the "purge button" on the front of the DV is pressed or when the diver lowers the pressure inside the chamber by trying to inhale.
		This is called a "free flow" and is designed as a "fail safe" so that the diver can continue to breathe for a few seconds or minutes until all the gas is rapidly exhausted.
		If there is neither a demand valve nor a pressure relief valve there is a danger the excess gas will "free flow" to the buoyancy compensator or diving suit resulting in a rapid increase in buoyancy causing a potentially lethal ascent to the surface.
	www.sciencedaily.com /encyclopedia/diving_regulator (996 words)

	News Item : Valve Demand to Increase 5.5 Percent Per Year (Site not responding. Last check: 2007-10-09)
		World demand for industrial valves is forecast to increase 5.5 percent per year through 2007 (including price increases) to more than $60 billion, according to “World Valves,” a study from Freedonia Group Inc., a Cleveland-based industrial market research firm.
		Although the valve markets in the United States, Japan and Western Europe will register gains that will lag the global average through 2007, according to Freedonia, all three also will see an improvement in their respective markets over the performance of the 1997 to 2002 period.
		The largest and most technically proficient valve manufacturing industries generally are located in the developed nations, as evidenced by the fact that the United States, Germany, Japan and Italy together accounted for more than half of global valve production in 2002.
	www.process-heating.com /CDA/ArticleInformation/news/news_item/0,3160,122759,00.html (336 words)

	Minnesota Rule 4715.3700
		This is the supply demand which is based on the numbers and kinds of fixtures installed, on the rates of flow required by the different kinds of fixtures, and on the probable simultaneous operation of the various fixtures.
		By using subpart 5 curve number 2 it is determined that the supply demand in GPM for hot water is 7 and by using the same figure but curve 1 it is determined that the demand for cold water in GPM is 67 and the total demand in GPM is 68.
		The 35 GPM demand figure would also be added to the cold water demand figure of 270 giving total cold water demand of 305 GPM and this figure would be used in sizing the cold water distribution piping.
	www.revisor.leg.state.mn.us /arule/4715/3700.html (2076 words)

	STANDARD OPERATING PROCEDURE
		Ensure the demand valve mode selector is in the “donning” (off) position.
		Note: By-pass valve will be used in an emergency situation should the demand valve become damaged or inoperative during use.
		Turn the demand valve mode selector to the OFF (doffing) position.
	www.newberrycounty.net /fire/SCBA.htm (334 words)

	Airline breathing equipment from Breathing Equipment Hire Ltd. (Site not responding. Last check: 2007-10-09)
		The Centair is a demand valve fed positive pressure compressed airline breathing apparatus.
		The demand valve incorporates a first breath mechanism to activate the air supply.
		The Flite is basically the same as the Centair but has the addition of a 5 or 10 minute personal escape cylinder to enable a user to exit a hazardous area in the case of an airline supply failure.
	www.behltd.co.uk /airline.html (262 words)

	Development of SCBA
		The pressure gauge shutoff valve is the metal lever located between the pressure reducer and the preflush unit.
		It is called a "bypass" valve because pushing it sends oxygen directly from the cylinder to you, hence "bypassing" the parts of the apparatus that limit or control its pressure.
		Inhalation Valve Test- Now to test the inhalation valve: Remove the hose from the exhalation valve, and connect it to the inhalation valve, making sure to position the hose so that the saliva trap is in a vertical position before tightening the connection.
	www.dep.state.pa.us /dep/deputate/minres/dms/website/rescue/manual/section1.htm (9318 words)

	CPR Oxygen O2 Demand Valve Resuscitator (Site not responding. Last check: 2007-10-09)
		Designed to meet the varying requirements of the Emergency Medical Services and Rescue Personnel, the Demand Valve Resuscitator is the only device of its type that comes standard with an audible pressure relief system with audible alarm and a Manual Ventilation Button conveniently located on the front of the resuscitator.
		During spontaneous respirations, the Demand Valve Resuscitator is designed to provide 100% oxygen to the patient with minimal inspiratory effort.
		The oxygen demand flow is controlled by the patient’s inspiratory effort with a peak flowrate of 160 litres per minute to accomodate the patient’s own respiratory distress situation.
	www.cpr-pro.com /o2demandvalveres.html (312 words)

	UOE Carts, Parts & Accessories
		Comes with demand valve and mask, inhalator mask, cylinder wrench, and “E” cylinder.
		The kit includes a demand valve, flow control valve, aspirator, resuscitator mask, inhalator mask, small and large airways, cylinder wrench, special dual cart, regulator, and two “E” cylinders.
		Does not have demand mode but can be used as constant flow inhalator with low, medium and high flow settings.
	www.uoequipment.com /prod05.htm (339 words)

	NIOSH/Certified Equipment List/Definitions of Terms (Site not responding. Last check: 2007-10-09)
		A type of N. or P series disposable particulate respirator with a filter as an integral part of the facepiece or with the entire facepiece composed of the filtering medium.
		Very similar to the demand class except that the regulator admission valve is held slightly open until the pressure in the timepiece reaches a preset pressure point, then closes (maintains a slight positive pressure in the facepiece at all times).
		All pressure-demand devices have a special exhalation valve that maintains about 1.5 inches H20 positive back pressure in the facepiece, and opens only when the pressure exceeds that value.
	www.cdc.gov /niosh/celdef.html (1348 words)

	Anti-g valve operation (single stage)
		assembly, forcing the demand valve from its seat,
		valve outlet into the valve outlet line, through the
		valve closes under  pressure of the heavier lower
	www.tpub.com /content/aviation/14020/css/14020_14.htm (142 words)

	CHEST: Effect of tracheal gas insufflation on demand valve triggering and total work during continuous positive airway ... (Site not responding. Last check: 2007-10-09)
		The RM-chamber was ventilated using a sinusoidal flow pattern with a tidal volume (VT) of 0.5 L at various peak inspiratory flow rates (Vpk) to simulate differences in effort intensity.
		The L-chamber was connected to a 60-L/min continuous flow circuit with a 10 cm [H.sub.2]O positive end-expiratory pressure valve and to 3 different ventilator demand valve circuits, each set at continuous positive airway pressure (CPAP) of 10 cm [H.sub.2]O. We used continuous TGI at 0, 2.5, 5, 10, and 15 L/min.
		We conclude that weak patients may fail to open the demand valve of the CPAP system during TGI at high catheter flow rates.
	www.findarticles.com /p/articles/mi_m0984/is_n3_v110/ai_18700465 (947 words)

	3M Safety : 3M™ Pressure Demand, Tight-Fitting Facepiece Systems 6000 and 7000 Series (Site not responding. Last check: 2007-10-09)
		This breathing tube is part of the 3M™ Pressure Demand Valve Assembly that is used on some 3M™ Supplied Air Respirator Systems.
		It connects to the belt clip assembly and the pressure demand valve.
		The pressure demand valve assembly connects to the front of the facepiece.
	products3.3m.com /catalog/us/en001/safety/occ_health_safety/node_GS8XF58JY9be/root_GST1T4S9TCgv/vroot_5SDD44F7DZge/gvel_QN4J4H5TZLgv/command_AbcPageHandler/theme_us_ohes_3_0 (326 words)

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