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  • often
  • In rare instances, mitral valve prolapse can lead to additional health complications, such as an arrhythmia, which is an irregular heartbeat, or endocarditis, an infection of the heart often caused by bacteria. (healthday.com)
  • seal
  • The oldest PRV designs use a weight to seal the valve. (wikipedia.org)
  • The resilient seat is under compression when it is mounted in the valve body, thus making a seal around the periphery of the disk and both upper and lower points where the stem passes through the seat. (tpub.com)
  • Metal, and some hard plastic valve caps have a rubber-washer seal (or a synthetic-rubber-washer seal) inside to help make a hermetic seal (airtight seal). (wikipedia.org)
  • In addition, the rubber washer prevents the cap from loosening and falling off due to vibrations and hence being lost, by acting as a cushion between the cap and the valve stem and in this way damping the vibrations, though most caps are a softer plastic making the need for a separate seal unnecessary. (wikipedia.org)
  • 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. (wikipedia.org)
  • artificial
  • There are two basic types of artificial heart valve , mechanical valves and tissue valves. (wikipedia.org)
  • The techniques of mitral valve repair include inserting a cloth-covered ring around the valve to bring the leaflets into contact with each other ( annuloplasty ), removal of redundant/loose segments of the leaflets (quadrangular resection), and re-suspension of the leaflets with artificial ( Gore-Tex ) cords. (wikipedia.org)
  • The development of the heart-lung machine in the 1950s paved the way for replacement of the mitral valve with an artificial valve in the 1960s. (wikipedia.org)
  • Finally, artificial tissue valves will wear out - on average lasting between 10 and 15 years, requiring further surgery at an advanced age. (wikipedia.org)
  • I'm presuming there has been a separation of the parts of the valve that had become stuck together, rather than the replacement of the valve with an artificial one. (netdoctor.co.uk)
  • Dear Dr., My wife has replaced mitralvalve with artificial valve. (medhelp.org)
  • internally
  • However, positive identification of a globe valve must be made internally because other valve types may have globular appearing bodies. (tpub.com)
  • Internally piloted valves are used in dishwashers and irrigation systems where the fluid is water, the pressure might be 80 psi (550 kPa) and the orifice diameter might be 3⁄4 in (19 mm). (wikipedia.org)
  • shut
  • The valve can become either leaky ( regurgitant or insufficient) or stuck partially shut ( stenotic ). (wikipedia.org)
  • If a solid gate fits snugly between the seat of a valve in a cold steam system, when the system is heated and pipes elongate, the seats will compress against the gate, wedging the gate between them and clamping the valve shut. (tpub.com)
  • An earthquake valve (or seismic valve) is an automatic method to shut off the low pressure regulated gas supply to a structure during a major earthquake and/or if a pipe is broken. (wikipedia.org)
  • The air pressure in an inflated tire holds the inner valve body shut. (wikipedia.org)
  • A small screw and captive nut on the top of the valve body permits the valve to be screwed shut and ensure that it remains tightly closed. (wikipedia.org)
  • surgical
  • Aortic valve replacement is a surgical procedure in which a patient's aortic valve is replaced by a different valve. (wikipedia.org)
  • For decades after, mitral valve replacement was the only surgical option for patients with a severely diseased mitral valve. (wikipedia.org)
  • In the past two decades, some surgeons have embraced surgical techniques to repair the damaged native valve, rather than replace it. (wikipedia.org)
  • The traditional surgical approach to a mitral valve repair is a full or partial sternotomy , in which the surgeon cuts through the breastbone at the center of the chest to access the heart. (wikipedia.org)
  • However, if there is damage to other valves in the heart as well, then surgical repair or replacement must be considered. (encyclopedia.com)
  • Leaking valves can be corrected by mitral valve annuloplasty, a common surgical procedure that aims at restoring proper leaflet adjustment. (wikipedia.org)
  • ball valves
  • Stop valves can be divided into four general categories: globe, gate, butterfly, and ball valves . (tpub.com)
  • Like all ball valves its handle will parallel the gas line when open and be perpendicular when closed, making for easy visual identification of its status. (wikipedia.org)
  • open
  • Aortic valve replacement traditionally required open heart surgery . (wikipedia.org)
  • The relief valve is designed or set to open at a predetermined set pressure to protect pressure vessels and other equipment from being subjected to pressures that exceed their design limits. (wikipedia.org)
  • When the set pressure is exceeded, the relief valve becomes the " path of least resistance " as the valve is forced open and a portion of the fluid is diverted through the auxiliary route. (wikipedia.org)
  • In high-pressure gas systems, it is recommended that the outlet of the relief valve is in the open air. (wikipedia.org)
  • If the valve is opened the pressure has to decrease enormously before the valve closes and also the outlet pressure of the valve can easily keep the valve open. (wikipedia.org)
  • In such cases, vacuum relief valves are used to open at a predetermined low pressure limit and to admit air or an inert gas into the equipment so as control the amount of vacuum. (wikipedia.org)
  • On the other hand, if the camshaft keeps the valves open for longer periods of time, as with a racing cam, problems start to occur at the lower engine speeds. (wikipedia.org)
  • Late intake valve closing (LIVC) The first variation of continuous variable valve timing involves holding the intake valve open slightly longer than a traditional engine. (wikipedia.org)
  • I've had heart surgery to open the mitral valve to allow more blood through. (netdoctor.co.uk)
  • The stem is used to push down on the valve to open it, with a spring generally being used to return it to the closed position when the stem is not being depressed. (wikipedia.org)
  • usually
  • The commissural posts have some degree of play and can splay outward quite a bit, so these structural elements of the BPV do not usually limit the diameter that can be achieved with valve-in-valve therapy. (ahajournals.org)
  • The blowdown is usually stated as a percentage of set pressure and refers to how much the pressure needs to drop before the valve reseats. (wikipedia.org)
  • The typical method of treatment is through surgery such as aortic valve reconstruction surgery (AVRS) and aortic valve replacement , usually with a synthetic valve. (wikipedia.org)
  • Procedures on the mitral valve usually require a median sternotomy , but advances in non-invasive methods (such as keyhole surgery ) allow surgery without a sternotomy (and resulting pain and scar). (wikipedia.org)
  • The treatment is usually by surgery (tricuspid valve replacement ) or percutaneous balloon valvuloplasty . (wikipedia.org)
  • Valves are technically fittings, but are usually discussed as a separate category. (wikipedia.org)
  • Valve bodies are usually metallic or plastic. (wikipedia.org)
  • It consists of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. (wikipedia.org)
  • The valve is usually a flat disk of metal with a long rod known as the 'valve stem' attached to one side. (wikipedia.org)
  • A saddle valve is mounted directly on to a pipe which is usually 1/2 inch copper tubing. (wikipedia.org)
  • The weakest point of a bicycle rim is usually the hole for the valve stem. (wikipedia.org)