Atrioventricular having to do with an Atrium anatomy atrium and Ventricle heart ventricle can refer to Left atrioventricular opening Atrioventricular fistula Atrioventricular node The term Atrioventricular valves is used to describe the mitral valve and tricuspid valve . disambig ... more details
Orphan date November 2006 Infobox Company company name China Yuhuan Mersbrass Co.,Ltd company type Public company Public foundation 1995 location Longxi Xiaomixi, Chumen Town, Yuhuan , Zhejiang , China industry ball valves, angle valves, bibcock, check valves homepage http www.valve trade.com www.valve trade.com Valves manufacturer China Yuhuan Mersbrass Co., Ltd is a manufacturer of various brass ball valve , check valve , floor drain and various kinds of copper fitting etc. Their products are used in a wide range of industry, such as, petroleum , chemical industry , metallurgical industry, chemical fibre , urban construction, power industry and cement. The company has an accredited IS09001 certificate of Quality business quality system . Products and services Alllead s products and services include ball valve check valve angle valve bibcock fittings reducing valve plumbing parts External links http www.valve trade.com Yuhuan Mersbrass Co.,Ltd Category Companies based in Zhejiang Category Valve manufacturers Category Companies established in 1995 ... more details
Orphan date February 2009 Multilayer soft lithography MSL is a fabrication process in which microscopic chambers, channels, valves and vias are molded within bonded layers of elastomer . tech stub Category Lithography microfabrication ... more details
A pilot valve is a small valve that controls a limited flow control feed to a separate piloted valve. Typically, this valve controls a high pressure or high flow feed. Pilot valves are useful because they allow a small and easily operated feed to control a much higher pressure or higher flow feed, which would otherwise require a much larger force to operate indeed, this is even useful when a solenoid is used to operate the valve. Pilot valves are often used in critical applications i.e., emergency and safety controls and are human operated. They can be set up as a push to activate or dead man s switch . tech stub Category valves ... more details
unreferenced date April 2011 Trickle valves , also known as vacuum valves , are commonly used in industrial dust collection applications to maintain an airlock seal on a dust collector hopper particulate collection container hopper while allowing bulk solid material to be automatically discharged. These valves are typically a less expensive alternative to more commonly used Rotary feeder rotary airlocks . Unlike rotary airlock valves which are driven by either an electric motor or a Pneumatic motor gas or air powered motor , trickle valves require no external power source. Operation Trickle valves can be used only on systems operating under negative pressure. The vacuum created inside the dust collector holds the valve closed, allowing a head of material to build up above the trickle valve. Once the pressure of the material equals the Vacuum negative pressure of the system, the valve is forced open and a trickle of material will begin flowing from the valve at the same rate it is collected. The magnitude of the vacuum of the system and the bulk density of the material being handled determine how much material will build up before the valve begins to discharge. Because trickle valves work automatically and require no power source or controls, they have very low initial cost and virtually no operating cost. Design A well designed trickle valve has few or no moving parts. Most trickle valves are also adjustable as to how much vacuum pressure it takes to operate. Adjustments are typically made with a Counterweight weighted counterbalance or an adjustable leaf spring . Because these valves have no way to force clogs through, they are only recommended for use with dry and relatively dense, free flowing materials such as sand , fly ash , and cement . Types Duckbill sleeve type .... Duckbill sleeve trickle valves have no moving parts. Trap door type Trap door trickle valves ... Types of gates Category Valves Category Bulk material handling ... more details
valve is from a family of valves called quarter turn valves . The butterfly is a metal disc mounted ... kinds of butterfly valves, each adapted for different pressures and different usage. The resilient ... able to withstand a greater amount of pressure. Structure Butterfly valves are valves with a circular ... valve can appear in various styles, including eccentric and high performance valves. These are normally ... valves are used on firefighting apparatus and typically are used on larger lines, such as front and rear suction ports and tank to pump lines. Types Concentric butterfly valves This type of valves has a resilient rubber seat with a metal disc. Doubly eccentric butterfly valves high performance butterfly valves or double offset butterfly valves Different type of materials is used for seat and disc. Triply eccentric butterfly valves triple offset butterfly valves The seats are either laminated or solid ... valves are generally used in applications which require bi directional tight shut off in oil and gas ... extrusion. Wafer style butterfly valves The wafer style butterfly valve is designed to maintain ... valve Lug style valves have threaded inserts at both sides of the valve body. This allows them ... end service, has a 75 psi rating. Images commons category Butterfly valves gallery Image Butterfly ... links http www.tpub.com fireman 69.htm Valve types Category Valves Category Plumbing valves ar ... more details
allows fluid liquid or gas to flow through it in only one direction. Check valves are two port valves .... There are various types of check valves used in a wide variety of applications. Check valves are often ..., check valves generally are very small, simple, and or inexpensive. Check valves work automatically ... valve handle or stem. The bodies external shells of most check valves are made of plastic or metal. An important concept in check valves is the cracking pressure which is the minimum upstream pressure ... for a specific cracking pressure. Heart valve s are essentially inlet and outlet check valves for the heart Ventricle heart ventricle s, since the ventricles act as pump s. Types of check valves ... part to block the flow, is a spherical ball. In some ball check valves, the ball is Spring ... check valves are more or less conically tapered to guide the ball into the seat and form a positive seal when stopping reverse flow. Ball check valves are often very small, simple, and cheap. They are commonly ... s and similar applications commonly use small inlet and outlet ball check valves with both balls and seats ... valves can eventually wear out or the seat can develop a crack, requiring replacement. Therefore, such valves are made to be replaceable, sometimes placed in a small plastic body tightly fitted ... into the pump head. There are similar check valves where the disc is not a ball, but some other shape, such as a Poppet valve poppet energized by a spring. Ball check valves should not be confused with ball ... the two ports or at an angle. Although swing check valves can come in various sizes, large check valves are often swing check valves. The flapper valve in a Flush toilet Tank style with flapper flush ... off flow. Multiple check valves can be connected in series. For example, a double check valve is often ... into municipal water supply line s. There are also double ball check valves in which there are two ... reverse flow and piston check valves, wafer check valves, and ball and cone check valves. Applications ... more details
metal often brass plug valves are often used as simple shut off valves in household natural gas ... three ports together. The flow directing possibilities in multi port plug valves are similar to the possibilities in corresponding multi port ball valve s or corresponding multi port valves with a rotor. An additional possibility in plug valves is the have one port on one side of the plug valve and two ... valves. When fused with the glassware, the valve bodies are made of glass. Otherwise, they can be made ... Plug valves position left References American Petroleum Institute Standards API 6D Pipeline Valves API STD 599 Metal Plug Valves references Category valves de K kenventil fr Vis pointeau ru ... more details
Brass instrument valves are valves used to change the length of tubing of a brass instrument allowing the player to reach the notes of various harmonic series music harmonic series . Each valve pressed diverts the air stream through additional tubing, individually or in conjunction with other valves. This lengthens the vibrating air column thus lowering the fundamental tone and associated harmonic series produced by the instrument. Valves in brass instruments require regular maintenance and lubrication to ensure fast and reliable movement. Piston valve The piston valve found in the majority of valved brass instruments was invented in 1838 and patented in 1839. They are sometimes called P rinet valves after their inventor, Fran ois P rinet . ref http orgs.usd.edu nmm UtleyPages Utleyfaq brassfaqPerinet.html ref They work by diverting air obliquely through ports in the stock of the valve so that a loop of tubing is included in the air stream, lowering the pitch. The stock of the valve is cylindrical and moves up and down through a larger cylindrical casing. Rotary valve The rotary valve works using a short circular plug housed in a larger cylindrical casing. Ports are cut along one plane ... degrees. Trombone F attachment valves are usually rotary, with several variations on the basic design ... rotary valves, and many tuba s have rotary valves. Joseph Riedlin is credited with the first use of rotary valves on brass instruments in 1832. ref http www.public.asu.edu jqerics earlval.htm ref ... Vienna model of these valves was operated by long rods connecting the pistons to spring loaded keys on the other side of the instrument. They are called Vienna valves because while they have ... , who first applied these valves to the french horn in 1814. Until that point, there had been .... The air is then led through an oblique port in the piston to a short tube connecting the valves where ... parts and accessories Category Valves ... more details
take place. Types There are three main types of sleeve valves inline, angle pattern and downflow pattern ... sleeve valves employ a similar design as the inline sleeve valve by creating an outer annular ... direction after passing through the sleeve changes by 90 . Downflow pattern sleeve valves ... by the valve itself. Advantages Sleeve valves can operate for long periods of time over a high .... Because of this a single sleeve valve can replace several standard valves used in series. Sleeve valves can control flow and or pressure over the entire stroke of the valve. Conventional control valves can typically control flow or pressure in the 20 to 80 range. Additionally, unlike conventional control valves the sleeve valve increases flow incrementally, i.e. 10 increase in stroke leads to a 10 increase in flow. Sleeve valves are adaptive to system or consumer requirements. The sleeve ... conventional control valves are designed to a specific set of conditions. Disadvantages Sleeve valve are generally more expensive than other types of control valves. Typically, sleeve valves are employed in situations where they would replace multiple valves in series or where frequent maintenance may be required, Sleeve valves need to be used where large debris is not expected in the system ... the valve interior for debris removal. Installations Typical installations for sleeve valves ... level control. Reservoir Discharge Sleeve valves are used to control flow and dissipate excess energy ..., and also maintain downstream flow requirements.nk Level Control Sleeve valves are ideal to control ... of Multijet Sleeve Valves . REC ERC 77 14, December 1977 Category Articles created via the Article Wizard Category Valves Category Water industry ... more details
of their ability to cut through liquids, gate valves are often used in the petroleum industry. On opening ... flow. Typical gate valves are designed to be fully opened or closed. ref Fluid Power, Naval Education ... content engine 14105 css 14105 87.htm ref Gate valves are characterised as having either a rising .... Nonrising stem valves may have a pointer threaded onto the upper end of the stem to indicate valve ... closure for the valve body. Gate valves may have a screw in, union, or bolted bonnet. Screw ... bonnet is used for larger valves and higher pressure applications. Another type of bonnet construction in a gate valve is pressure seal bonnet . This construction is adopted for valves for high pressure ... in the body bonnet joint. Gate valves may have flanged ends which are drilled according to pipeline compatible flange dimensional standards. Gate valves are typically constructed from cast iron , ductile ... Commons category Gate valves File Gatevalve.ogg thumb Gate valves gallery Image Valve.jpg Stainless ... Stockist.jpg Nuts and bolts for incoloy valves Image GateValve.JPG 22mm gate valve on domestic hot water pipe. Image BrokenGateValve2.JPG Gate valves are prone to corrosion. Here the shaft has broken ... pipe systems Needle valve References Reflist DEFAULTSORT Gate Valve Category Plumbing valves Category Valves ar ca V lvula de comporta de Absperrschieber es V lvula de compuerta it Valvola ... more details
. Alexander demonstrates its flexibility to the full, utilising both slide and valves expertly, combining ... with the left hand, while the valves were played with the right hand. One of the earliest recorded ... of a traditional tenor trombone with 7 positions, when no valves are depressed. It also has a set of three valves, lying just after the slide in the airstream, which are arranged in the same manner ..., since the slide positions do not stay the same when valves are depressed, and the valve tubing is not long enough to be in tune if the slide is engaged. Larger downward transpositions with the valves ... positions may be used when the valves are depressed, as on a trombone with an F attachment, or on a bass trombone with rotary valves. See also Firebird trumpet Firebird , a trumpet with both valves ... more details
steam. There were two reasons for this With piston valves, the steam passages can be made shorter ... lubricate slide valves adequately in the presence of superheated steam. clear Murdoch s D slide ... D sectioned piston. This valve worked by connecting the upper and lower valves so as to be worked ... for an induction pipe to the upper end of the cylinder. This allowed two valves to do the work of four. The above description referring to upper and lower valves clearly relates to an engine with a vertical ... , the valves would be side by side. Balanced slide valve The balanced slide valve was invented by the Scotland ... Corliss valve External links commons category Steam engines with slide valves http oldenginehouse.users.btopenworld.com slide.htm The Slide Valve steam engine configurations Category Engine valves ... more details
Block and Bleed Valves DBB Valves feature the traditional style of flange by flange type valve and is available ... section of the pipeline. Because the valves are full bore with an uninterrupted flow orifice they have got a negligible pressure drop across the unit. The pipelines where these valves are installed can ... more details
Layout Valvetrain The valvetrain consists of valves, rocker arms, pushrods, lifters, and camshaft ... the task of opening and closing the valves at the time necessary for proper operation of the engine ... The camshaft or camshafts, depending on the design employed is located above the valves within the cylinder head, and operates either indirectly or directly on the valves. Cam in block The camshaft is located within the engine block, and operates directly on the valves, or indirectly via pushrods ... actuate the valves. Parts As stated above, the valvetrain is the mechanical system responsible for operation of the valves. Valves are usually of the Poppet valve poppet type, although many others have been developed such as Sleeve valve sleeve , slide and rotary valves. Poppet valves typically require ... can be used in place of valve springs to keep the valves closed Formula 1 engines employ pneumatic valve springs in which pneumatic pressure closes the valves, while motorcycle manufacturer Ducati uses desmodromic mechanisms to mechanically close the valves. Depending on the design used, the valves ... the valves. Pushrods are long, slender metal rods seated within the engine block. At the bottom ... on the valve. Camshafts must actuate the valves at the appropriate time in the Four stroke cycle ... more details
Unreferenced date December 2007 For the ball valves found in UK toilet cisterns and attic tanks float ... turn valves . Ball valves are durable and usually work to achieve perfect shutoff even after years ... in throttling applications but are sometimes used for this purpose. Ball valves are used extensively ... 0.5 cm to 30 cm . They are easy to repair and operate. The body of ball valves may be made ... general body styles of ball valves single body , three piece body , split body , top entry ... require pigging . In reduced port or more commonly known reduced bore ball valves, flow through the valve ... anchoring of the ball at the top and the bottom, suitable for larger and higher pressure valves say .... Manually operated ball valves can be closed quickly and thus there is a danger of water hammer . Some ball valves are equipped with an actuator that may be pneumatically or Electric motor motor operated. These valves can be used either for on off or flow control. A pneumatic flow control valve is also ... opening accordingly. Three way and four way ball valves Image 3 way.svg 120px thumb right Schematic ... ball valves have an L or T shaped hole through the middle. The different combinations of flow are shown ... the side ports together. Multi port ball valves with 4 ways, or more, are also commercially available ..., sometimes referred to as an big big port. Ball valves in sizes up to 2 inch generally come in single piece, two or three piece designs. One piece ball valves are almost always reduced bore, are relatively inexpensive and generally are throw away. Two piece ball valves are generally ... Image Duplex ball valves The Alloy Valve Stockist side.JPG Super duplex ball valves Image Valve balls The Alloy Valve Stockist.jpg Balls for alloy ball valves Image Valve nuts bolts The Alloy Valve Stockist.jpg Nuts and bolts for incoloy valves Image Ball valve ball The Alloy Valve Stockist.jpg ... File Ball valve, ball valve valve.jpg thumb Assorted ball valves References Empty section date July ... more details
Unreferenced stub auto yes date December 2009 For other meanings of the word Penta Penta disambiguation In engine design, the penta engine or penta head is an arrangement of the upper portion of the cylinder engine cylinder and valves that is common in engines using more than two valves per cylinder. It is similar in concept to the hemi engine , both in design and raison d etre , but the hemi is limited to only two valves and thus penta designs tend to be somewhat more efficient. The four valve penta engine design was invented by Peugeot of France, to be first used in the 1911 Indianapolis 500 race. The penta engine also termed pentroof combustion chamber is the most common design used today by many manufacturers for four valve per cylinder engines producing relatively high horsepower for displacement, for both racing engines and engines for passenger cars. DEFAULTSORT Penta Engine Category Internal combustion piston engines Tech stub ... more details
Image Endobronchial valves placed in airways.png right thumb Endobronchial valve An endobronchial valve is an implantable medical device a small, one way valve , which is implanted in an airway in the pulmonary system to treat one of several lung conditions. The one way endobronchial valve is typically implanted such that when a patient exhales, air is able to flow through the valve and out of the lung compartment that is fed by that airway, but when the patient inhales, the valve closes and blocks air from entering that lung compartment. Thus, an implanted endobronchial valve typically helps a lung compartment to empty itself of air. This has been shown to be beneficial in the treatment of emphysema , where lungs lose their elasticity and thus cannot contract sufficiently to exhale air, leading to air trapping and hyperaeration . When one or more diseased portions of an emphysematous lung ... PA191&vq 22Endobronchial valve 22&dq 22Endobronchial valve 22 ref Endobronchial valves have also been ... that endobronchial valves may be useful for treatment of tuberculosis and its complications. Endobronchial valves were developed primarily by the start up medical device company Emphasys Medical now ... out one or more most diseased portion s of a lung. Endobronchial valves were designed to replicate the effects ... assessment tool used with endobronchial valves to help physicians target appropriate lung compartments ... valve and was acquired by Olympus in 2010. Endobronchial valves may be the first successful ... and has no known cure. Endobronchial valves are typically implanted using a flexible delivery catheter advanced through a bronchoscope , and thus they are very minimally invasive . The valves are also ... valves have been shown to improve patients ability to breathe, walk, exercise and perform their daily ... in the United States, endobronchial valves are available in many other locations throughout the world ... Category Medical equipment Category Valves ... more details
A hydrogen valve is a special type of valve that is used for hydrogen at very low temperatures or high pressures in hydrogen storage or for example hydrogen vehicles . Image Inconel Tilting disc check valve The Alloy Valve Stockist.JPG 180px right thumb Inconel tilting disc check valve for hydrogen service. Types High pressure ball valve s up to 6000 psig 413 Bar unit bar at 250 degrees F 121 degrees C and flow coefficients from 4.0 to 13.8. ref http findarticles.com p articles mi m0EIN is 2004 August 23 ai n6165031 Hydrogen ball valve ref Material Valve s used in industrial hydrogen and oxygen applications, such as petrochemical processes, are often made of inconel . See also Diaphragm valve Gate valve Hydrogen tank Commons category Inconel valves Inconel valves position left References reference External links http www.ika.rwth aachen.de r2h index.php Hydrogen Valve Hydrogen valve DEFAULTSORT Hydrogen Valve Category Valves Category Hydrogen technologies ar ... more details
Unreferenced stub auto yes date December 2009 A chemigation valve is an apparatus designed to protect water supplies from agricultural chemical s used during chemigation, the application of chemicals such as fertilizer s and pesticide s through irrigation water. Most chemigation valves consist of a spring loaded check valve , a low pressure drain, an air and vacuum relief valve, and an injection port for introducing the chemicals downstream of the check valve. Many chemigation valves also have a 4 inch inspection port so that a person can reach inside and feel if the check valve is still functional. Some governments require the use of two chemigation valves installed in series if hazardous chemicals are to be injected. Texas State law Chapter 344.73 in Subchapter D 1. b An irrigation system which adds any chemical is considered to be a high health hazard . Such an irrigation system must not be connected to any potable water supply except through a reduced pressure principle backflow prevention assembly. See also Air gap plumbing Air gap Hydrostatic loop Pressure vacuum breaker Double check valve Reduced Pressure Principle BFP Atmospheric vacuum breaker DEFAULTSORT Chemigation Valve Category Plumbing valves Category Irrigation Agri stub ... more details
of the 80,000 convexo concave valves implanted fractured in this way, with the patient dying in two ... Heart Valve accessdate 2005 05 28 ref Valves welded by specific welders were at greater risk of fracture ... Shiley Heart Valve last Pringle first Evelyn accessdate 2006 05 28 ref Not all of these valves ... concave design and are reliable valves that do not require replacement. References reflist Category Valves Category Implants Category Cardiac anatomy Category Prosthetics ... more details
DCV can mean Democracia Cristiana Vasca meaning Basque Christian Democracy , a political party of Spain Directional control valve in pneumatics and hydraulics, valves used to control the flow of a fluid. Dry Creek Valley an area in the U.S. state of California known for its vineyards. disambig de DCV nl DCV ... more details
Wiktionary valve A valve is a device that regulates the flow of fluids. Types of such valves include Piston valve , a part in many brass instruments, used to control notes. Mercury arc valve , a type of electrical rectifier which converts alternating current into direct current Poppet valve , a valve consisting of a hole and a tapered plug on the end of a shaft, typically used in instruments, engines, etc. Heart valve , valves in the heart that maintain the unidirectional flow of blood Vein valve , valves in veins and other fluid cords in body And see Valve Types Valve may also refer to Vacuum tube , also called thermionic valve , an electronic component Valve Corporation , a computer software games company responsible for the best selling Half Life games Valve hall , a building which contains the valves of the static inverters of an HVDC plant Valve Records , a record label Valve, a paired clasping process on the male genitalia of a moth Valve mollusc , One half of the shell of a bivalve mollusc , one of eight overlapping shells on a chiton disambig ar eo Valvo fr Valve gl V lvula it Valvola nl Ventiel pl Zaw r pt V lvula ru simple Valve disambiguation fi Valve ... more details
Unreferenced date December 2009 Orphan date December 2009 File Saddle valve.jpg thumb A saddle valve used to connect a humidifier s water intake to a residential cold water Pipe fluid conveyance pipe . A saddle valve is a valve used to supply liquid where a low volume, low pressure stream is required. The name is derived from the fact that it is mounted in such a way that it saddles the line, mounting it from both sides. They are typically used for supplying cold water, via a 3 8 inch tube, to humidifiers and icemaker s in freezers. A saddle valve is mounted directly on to a pipe which is usually 1 2 inch copper tubing. Saddle valves are self tapping devices. Once mounted on a line, with the included rubber seal in place, all that is required is to turn the valve clockwise until it pierces the water line. When the valve handle can no longer be turned, it is done tapping the pipe. Turning the handle counter clockwise opens the valve. These valves can be installed without shutting off the main water supply. Building code Plumbing code s, local or international, often do not allow use of a saddle valve instead a tee and a conventional globe, gate, or ball valve is to be installed. However, where allowed, saddle valves are low cost and easy to install. See also Valve Plumbing DEFAULTSORT Saddle Valve Category Valves ... more details
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