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Valve Reserve

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Valve Reserve
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Before we have discussed 5 features of a divers watch and now we will continue with some more features.

Pushers

Digital and some analog chronograph scuba diving watch - such as the Breitling Avenger Seawolf Chronograph, Doxa T-Graph, IWC Aquatimer Minute Memory, the Omega Seamaster Professional Chrono Diver series and Sinn U1000 - have specially-designed push pieces that can be operated at depth without allowing water to enter the case.

Helium release valve

Some scuba diving watches intended for saturation diving at great depths (typically greater than 100m) are fitted with a helium or mixed breathing gas release or escape valve to prevent the crystal from being blown off by a pressure build up caused by helium that has seeped into the watch in helium enriched environments as the watch and diver adjust to normal atmospheric conditions. Other helium safe/for mixed-gas rated diving watches can withstand the helium used in certain diving situations by using gaskets that simply do not allow helium gas to enter the watch case in a harmful way in the first place.

Legibility

The dials and markers on the scuba diving watch face and of course the bezel have to be legible under water and in low light conditions. An indication that the watch is running in total darkness also has to be present. For easy legibility most diving watches have high contrasting, none cluttered dials and markers with a large, easily identifiable minute hand. The markers for 3, 6, 9 and 12 o'clock on the scuba diving watch face and the zero marker on the bezel of analogue diver's watches are usually conspicuously styled to prevent disorientation induced read out errors. For low light conditions luminous phosphorescent non-toxic strontium aluminate based lume pigments marketed under brand names like Super-LumiNova or NoctiLumina and tritium based self-powered lighting devices called "gaseous tritium light source" (GTLS) is applied on the dials and markers. As for digital diving watches back lights are used for low light conditions legibility.

Power reserve indicator

A scuba diving watch with an electric battery powered movement must have an End Of Life (EOL) indicator, usually in the form of a jumping second hand or a warning message on a digital display to safeguard against insufficient power reserve during underwater activities. Some electric and mechanical powered movement diving models have power reserve indicators that show the current power status of the watch. Mechanical movements should be wound or in case of automatic movements given enough motion before a dive.

Crystal

Scuba Diving watches have relatively thick watch crystals face. Sometimes domed crystals are used to enhance the pressure resistance of the scuba diving watch. The typical materials used for crystals are acrylic glass, hardened glass and (synthetic) sapphire which all come with own pros and cons.

* Acrylic glass is very break resistant but can easily be scratched but the small scratches can be buffed out with polishing compounds.

* Hardened glass is more scratch resistant than acrylic glass and less brittle than sapphire.

* Sapphire is very scratch resistant but less shatter proof than the other crystal options. Anti-reflective coatings are generally applied on sapphire crystals to enhance the legibility of the watch.

Some manufacturers use sapphire/hardened glass laminate crystals, where the scratch resistance sapphire is combined with the better shatter resistance of hardened glass.

For the essential guide to all divers watch and scuba diving watches, learn all that's needed to know to make an informative choice for your next dive watch.

Heart Murmur – Symptoms, Causes and Treatment

A heart murmur is a whooshing sound between the beats that a doctor hears through a stethoscope. The whoosh is just an extra noise that the blood makes as it flows through the heart. Doctors usually discover murmurs during regular checkups or when kids see the doctor because they're sick. Normal heart sounds are called S1 and S2. They are the "lubb-dupp" sounds that are thought of as the heartbeat. These sounds are produced when the heart valves close. Because the heart is also divided into a "right side" and a "left side," sometimes these sounds may be somewhat divided -- most commonly noted is a "split S2," caused when the right and left ventricles relax, and valves close at very slightly different times.

Healthy children with innocent murmurs do not need treatment because they have a normal heart. If your child has an innocent murmur, alert your pediatrician during regular checkups. Pregnant women with innocent murmurs due to increased blood volume also do not need treatment. If you have an innocent murmur due to an illness or condition such as anemia, hyperthyroidism, or fever, the murmur will go away once the illness or condition is treated.

Causes

The most common cause of abnormal heart murmurs is congenital heart disease. Congenital heart disease occurs when the heart, heart valves, or blood vessels attached to the heart do not develop normally before a baby is born. Some babies are born with a combination of heart defects.

Most heart murmurs are innocent: They are caused by blood flowing through healthy valves in a healthy heart, and do not require treatment. However, heart murmurs can be caused by blood flowing through a damaged or overworked heart valve. Heart-valve defects may be present at birth or heart-valve disease may result from other illnesses, such as rheumatic fever, heart disease, heart attacks, or infective endocarditis.

Symptoms

Most people with heart murmurs do not have any other signs and symptoms of a heart problem. The murmur is usually innocent (harmless).

Some children have what is known as an innocent murmur. These murmurs are not related to congenital heart defects, and usually resolve by the time a child reaches adulthood. If your child's physician hears an innocent murmur, he/she may want to perform additional tests to ensure a heart defect is not present. A child with an innocent murmur can live a normal life and be as active as any other healthy child.

Treatment

Treatment for heart murmur depends on the cause. Many children and adults have innocent heart murmurs, which do not indicate disease and require no treatment. Sometimes, mitral valve prolapse requires no treatment, just periodic checkups by your doctor. When other conditions, such as high blood pressure, cause heart murmurs, your doctor will treat the underlying cause. Some types of valve disease may require medication or surgery.

Doctors used to recommend that most people with abnormal heart murmurs take antibiotics before visiting the dentist or having surgery. That's usually not the case anymore. Guidelines released in 2007 reserve preventive antibiotic treatment only for a small group of people who are at high risk of serious complications. Most people with heart murmurs won't need antibiotics. If you have questions about whether or not you should take antibiotics, talk to your doctor.

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My 1996 Virago 535 has a fuel issue as follows...when low on gas and the engine falters I switch to reserve ?

mode and the engine still falters. I know there is gas left in the tank because I can hear it when I shake the bike. I believe the reserve switch is working because the petcock clicks when I switch it on. Once I added more gas the engine ran fine with the switch either in the "on" or "reserve" position. My theory is that the fuel petcock valve is faulty in the reserve position. Has anyone else had this problem? Another possibility is the reserve fuel hose at the bottom of the fuel tank is plugged. Thanks for your help.

If it runs fine with the switch in either position when you add fuel, that seems to indicate the lines are open.

It may just be that there is an opening between the regular and reserve positions, and that, by the time the engine begins to falter you really are so low on fuel that it won't run.

Folks used to have that problem with the first VW bugs that had a reserve position and no gage. They would switch to reserve, and fill without remembering to switch back.

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