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	Butterfly valve - Wikipedia, the free encyclopedia
		A butterfly valve is a type of flow control device, used to regulate a fluid flowing through a section of pipe.
		The valve is similar in operation to a ball valve.
		Butterfly valves are widely used in water distribution and waste water processing (not recommended, as the debris may block the operation of the disc).
	en.wikipedia.org /wiki/Butterfly_valve (265 words)

	Anticorrosive butterfly valve - Patent 4516597 (Site not responding. Last check: 2007-10-13)
		An anticorrosive butterfly valve according to claim 1, characterized in that said parallel annular grooves formed on the outer surface of the valve seat ring are three to five in number.
		An anticorrosive butterfly valve according to claim 1, characterized in that the depth of each parallel annular groove formed on the outer surface of the valve seat ring is 1/3 to 1/4 of the thickness of the elastic layer.
		An anticorrosive butterfly valve according to claim 1, characterized in that the diameter of said vents for moisture formed through the wall of the valve body is 3 to 10 mm.
	www.freepatentsonline.com /4516597.html (2147 words)

	Typical Wafer Butterfly Valve Specifications
		All butterfly valves are to be rated at 200 PSI (150 PSI 14 inch and larger) minimum bubble tight shutoff, and tested for flow retention at 220 PSI (165 PSI 14 inch and larger) minimum.
		The valve disc shall be attached to the shaft by one or two precision taper pins to assure an absolute movement of the disc when the stem is rotated.
		Valve seat design shall allow the disc to be in the fully closed position during installation between flanges.
	www.cranevalve.com /clspec1.htm (437 words)

	A Review of Butterfly Valve Components and Operation
		The general temperature rating for a resilient seated valve is 25 Degrees F to 300 Degrees F and 400 Degrees F to 450 Degrees F for a high-performance butterfly valve.
		The disk is the equivalent of a plug in a plug valve, gate in a gate valve or a ball in a ball valve.
		In high-performance butterfly valves, the shutoff may be provided by an interference-fit seat design or a line-energized seat design, where the pressure in the pipeline is used to increase the interference between the seat and disk edge.
	www.chemicalprocessing.com /articles/1998/300.html (968 words)

	What is a Butterfly Valve?
		The high performance butterfly valve, used in slightly higher-pressure systems, features a slight offset in the way the disc is positioned, which increases the valve's sealing ability and decreases its tendency to wear.
		The valve best suited for high-pressure systems is the tricentric butterfly valve, which makes use of a metal seat, and is therefore able to withstand a greater amount of pressure.
		One of the most common examples of a butterfly valve is in the carburetor of a car.
	www.wisegeek.com /what-is-a-butterfly-valve.htm (344 words)

	The Valve Shop - Shop Valves Online! Valve Selection Guide
		Valves made specifically for on/off service are designed with tight reliable shutoff in the closed position and little restriction in the open position.
		Butterfly valves are the most economical valves per comparable capacity and are easily automated with pneumatic and electric actuators.
		The normal position is the position of the valve with the spring extended and the solenoid de-energized.
	www.thevalveshop.com /menu/select.html (2865 words)

	Crane Valve Group - Ask the Experts
		We have a 24" 150# Lug Butterfly Valve 316SS Flowseal #1LA222RTG30G.
		Butterfly valves are used for both on-off service like a gate valve and for throttling and modulating flow like a globe valve.
		Again the seating materials limit butterfly valve capabilities, but technological advancements in elastomeric materials as well as metal-seating technology have greatly improved in recent years so that butterfly valves have wide application in various industries and usually are used in piping systems of 2" and larger diameter.
	www.cranevalve.com /email.cfm (3482 words)

	Butterfly valve
		Butterfly valves are valves with a circular body and a rotary motion disk closure member which is pivotally supported by its stem.
		A Butterfly valve is also a type of flow control device, used to make a fluid start or stop flowing through a section of pipe.
		The valve is similar in operation to a ball valve.Rotating the handle turns the plate either parallel or perpendicular to the flow of water, shutting of the flow.
	www.valvedirectory.com /butterfly_valve.html (670 words)

	Rotary Valves and Actuators
		This valve is for use in heavy slurry or corrosive applications.
		The V250 is a flanged, reduced bore ball valve in 4- through 24-inch sizes and compatible with ANSI Class 600 or 900 for heavy duty (high temp or tight shutoff) throttling or on/off applications.
		The V260 is a flanged full ball valve in 8- through 16-inch sizes and compatible with ANSI Class 300 or 600 for high capacity process applications.
	www.emersonprocess.com /fisher/products/tour/rotaryvalves.html (967 words)

	butterfly valve installation tips
		Butterfly valves should be installed with the valve shaft horizontal or inclined from vertical.
		The valve should be mounted in the preferred direction, with the "HP" marking.
		The valve should be installed in the closed position to ensure that the laminated seal in the disc is not damaged during installation.
	www.valvediagnostics.com /installation/butterfly.htm (115 words)

	Butterfly Valve is suited for corrosive applications., George Fischer, Inc.
		Valve is made from double eccentric disk design and integrates electric position indicator as well as ergonomic, lockable hand lever.
		The Type 567/568 Butterfly Valve is available in sizes 2" to 8" (d63 to d225) and is offered with a variety of modular components resulting in a multitude of combination possibilities for optimum flexibility.
		Dec 21, 2001 - Butterfly Valves resist erosion and abrasion.
	news.thomasnet.com /fullstory/487517/rss (1189 words)

	butterfly valve >>
		Butterfly valve become closely associated with raves and nightclubs, places where people go to dance.
		While ecstasy use is butterfly valve common butterfly valve these environments, the term butterfly valve drug" is misleading.
		The butterfly valve is not exhaustive and is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for any individual.
	sitegtr.com /all/butterfly-valve.html (278 words)

	Valve and Equipment - carrying butterfly valve, tideflex valve, plug valve, gates valve, check valve, control valve, ...
		Valves are used for pipeline flow control, on-off shut-off service, throttling service, level control in tanks, and pump control.
		Flap Gate Valve: The valves have a cast iron flanged frame; cast iron flap; iron-to-iron, bronze or neoprene seating; and a bronze pivot pin.
		Valve and Equipment carries many specialty valves for Storm water Drainage Applications which include the Red Valve Weirflex Valves which is used in storm sewer applications and the Rubber Tideflex Duckbill Check Valves which is used to prevent flooding.
	www.valveandequipment.com (1621 words)

	Valve engineering - butterfly valve
		However, "double flanged" is commonly used in the butterfly valve industry to distinguish between the normal "double flanged" valve (two flanges, one on either side) from the "lug-type" which has a "single flange" in the center.
		Metal seated butterfly valves can be either damper type (somebody mentioned) with leakage rate varied usually by the valve size (very difficult to get a small damper to conform to a low leakage rate); or metal seated valves can be double or triple offset type.
		However, manufacturers of triple offset valves sometimes test to API 607 and produce certificates to this spec, claiming that their metal seal is to a certain degree flexible, and hence the seat is "soft".
	www.eng-tips.com /viewthread.cfm?qid=64692 (3939 words)

	Keystone Valves, Prince, Gulf Valve
		Keystone was the pioneer of the butterfly valve and began manufacturing in 1951.
		A versatile range of resilient seated quarter-turn butterfly valves is available in various designs, configurations and materials to match all specifications.
		The K-Lok high performance butterfly valve is available in polymer seats as well as metal and firesafe.
	www.keystonevalves.com (233 words)

	AMRI, Inc. Butterfly Valves, Actuators and Accessories - Houston, Texas
		Our valves are used in brine purification, wet and dry chlorine gas up to and including isolation of the chlorine compressors, caustic, sulfuric acid and cooling water.
		The ISORIA valve is a rubber lined valve used in non-corrosive and moderately corrosive applications such as 50% caustic soda, 98% sulfuric acid, seawater, cooling water, de-mineralized water, utilities, hydrogen gas, brown pulp stock, weak fl liquor, white liquor, limestone slurry in FGD (flue gas de-sulfurization), and others.
		The MAMMOUTH valve is a large diameter rubber lined valve used in fresh and salt water, river water, and limestone slurry applications.
	www.amrivalves.com (495 words)

	Hybrid Butterfly Valve (Site not responding. Last check: 2007-10-13)
		NASA seeks to transfer the NASA-developed hybrid butterfly valve This system, developed at NASA's Marshall Space Flight Center (MSFC), is a butterfly valve having a rotatable and slidable closure disk allowing the full-flow advantages of conventional butterfly valves and the throttling and sealing capabilities of globe and needle valves.
		The hybrid butterfly valve has a stationary seat and a valve closure disk which may rotate with a shaft having an axis transverse to the flow path through the valve body.
		Cams fastened to the shaft initiate a 90° rotation of the disk from the fully opened position to the position where the valve closure disk is aligned with the valve seat.
	techtran.msfc.nasa.gov /Patents/(31).html (237 words)

	Vortex Butterfly Valve - EP Application
		Vortex valves are applied based on 28 years of customer-proven application experience.
		This type of valve may be used independently or incorporated with other dry material handling equipment within a material handling system.
		This type of valve may also be known to those within the dry material handling industry as: butterfly valve, disc valve, salina butterfly valve, salina valve, vortex butterfly valve, vortex valve.
	www.vortexvalves.com /butterfly/ep_app.htm (153 words)

	Butterfly Valves by Asahi — America
		The name of this valve comes from the wing-like action of the flow-controlling disc, which operates at right angles to the flow.
		The butterfly valve can be used either as an on/off or modulating type of valve.
		Asahi butterfly valves are currently installed in leading Aquariums, swimming pools, mines, chemical processing plants, landfills and water and wastewater treatment plants in the United States and Central and South America.
	www.asahi-america.com /valves-butterfly-valves.htm (176 words)

	ISORIA Valves - AMRI, Inc. Butterfly Valves, Actuators and Accessories - Houston, Texas
		ISORIA 10/16 Valves are designed for the multitude of moderately corrosive applications throughout the industry.
		The ISORIA 10/16 valve uses a spherically machined disc and a one-piece body that is totally isolated from the flowing media by means of the inner elastomer lining.
		The ISORIA 10/16 valve is used in non-corrosive and moderately corrosive applications such as 50% caustic soda, 98% sulfuric acid, seawater, cooling water, river water, de-mineralized water, utility services, hydrogen gas, brown pulp stock, weak fl liquor, white liquor, high chloride content limestone slurry in FGD (flue gas de-sulfurization), and others.
	www.amrivalves.com /isoria.html (311 words)

	IVGE, IVTLE - Fully Rubber Encapsulated Butterfly Valve (Site not responding. Last check: 2007-10-13)
		Intervalve Butterfly Valve model IVGE / IVTLE is an economical answer to the corrosion problems faced by Chemical process industries with conventional metal seated Butterfly valves.
		The valve has a fully rubber lined body and a rubber encapsulated disc with a square slot for the drive end shaft.
		The valve is available in 'wafer' as well as 'wafer lugged' version with a host of seat and encapsulation material to cater to majority of the chemical process industry requirement.
	www.poonawallagroup.com /intervalve/ivge.htm (390 words)

	Butterfly Valve has inflatable seat., Posi-Flate Butterfly Valves
		Posi-flate has introduced an inflatable seated butterfly valve with a highly polished 316 stainless steel housing and disc.
		The inflatable seat design of the Posi-flate butterfly valve provides a better seal by utilizing air pressure to expand the seat against the disc, providing more sealing area and an even pressure distribution against the disc every time.
		Jul 20, 2006 - Butterfly Valve is suited for corrosive applications.
	news.thomasnet.com /fullstory/7512 (700 words)

	FCC butterfly valves \| Remosa's Web Resources
		These valves [see chart] are designed for minimum pressure drop since the main pressure drop should occur across the expander.
		The size of control and shut-off butterfly valves is determined by the flue gas volume and ranges from 42" to 80".
		The shut-off valve is the main protection of the expander and in order to do so needs to be tightly sealed and to have the capability to close at the required speed.
	www.remosa-valves.com /selection_butterfly.html (371 words)

	Butterfly Valve
		Available in flanged and mechanical joint end connections in AWWA Class 150B (cast iron) and 250B (ductile iron), the American-BFV butterfly valve features a 360° uninterrupted body seat with no shaft penetration designed to help assure leak free performance in water and wastewater applications.
		The valve has a ductile iron disc, resilient seat, self-lubricating sleeve bearings, self-adjusting /wear compensating shaft seal, and taper pins that lock the disc to the shaft to prevent leakage.
		A factory set bronze thrust bearing is incorporated to assure proper centering of the valve disc.
	www.wateronline.com /nl/22708/349359 (128 words)

	Welcome to Nexus Valve
		Nexus Valve was established in 1994 with the intent of providing the HVAC industry with the highest quality hydronic system components at reasonable costs.
		Nexus Valve was founded to provide single sourcing of quality hydronic components, to provide value-added services for resellers and users of hydronic products, and to allow others in the industry to benefit from such a program.
		The combined experience of the Nexus Valve staff ensures a complete understanding of the marketplace, from manufacturer to end user.
	www.nexusvalve.com (141 words)

	Butterfly valve Pit & Quarry - Find Articles
		Asahi/America Inc.'s Giant PDCPD Butterfly Valve features a molded, lined body with full seat design, eliminating the need for additional gaskets and providing a bubble tight seal.
		The valve's spherical shape disc reduces breakaway and sealing torque for long cycle life, and its wafer-style body minimizes space restrictions.
		The valve's body and disc are the only parts that come in contact with media.
	www.findarticles.com /p/articles/mi_m3095/is_4_97/ai_n9523035 (133 words)

	Butterfly Valve Installation
		Proper Installation Techniques must be followed to prevent immediate or premature failure of Butterfly valve seat, disc or shaft on any size or make wafer-style Butterfly valves.
		Pipework opened to allow free valve entry with the disc in a semi-closed position.
		Valve in semi-closed position to (1) protect disc edge, (2) reduce rubber interference during installation and start-up, and (3) help reduce initial torque build-up.
	www.besser.com /servicetips/2000dec19.htm (159 words)

	Crispin K-Flo Butterfly Valves from 3"-108"
		Crispin is proud to announce the acquisition of the K-Flo Butterfly Valve from Dezurik Water Controls of Sartell, MN.
		This valve line, which features 2 designs and ranges in size from 3” up to 108”, is fully compliant with AWWA C504 standards.
		Often referred to as the Wolverine valve line, K-Flo valves have more than 50 years of service in the industry.
	www.crispinvalve.com /butterfly.htm (123 words)

	Butterfly Swing Check Valve (Site not responding. Last check: 2007-10-13)
		This valve is short in length, so that it is rigid and easy to mount.
		This valve is tightly sealed without leakage under the pressure water rest.
		The stem of the valve should be perpendicular to the horizontal level when the valve is mounted on horizontal pipeline.
	www.fsbic.com /Butterfly_Swing_Check_Valve.html (258 words)

	Butterfly Valves & Shut Off Valves - Val-Matic
		butterfly valve or shut off valve provides the features and benefits that engineers and users prefer.
		The American-BFV butterfly valve / shut off valve is designed to provide long life and trouble free performance.
		Our butterfly valves / shut off valves are available in AWWA Class 150B Cast Iron and 250B Ductile Iron, making for an exceptionally strong shut off valve.
	www.valmatic.com /butterflyvalves.jsp (389 words)

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