Valves vary widely in form and application. Sizes typically range from 0.1 mm to 60 cm.
Special valves can have a diameter exceeding 5 meters.
Valve costs range from simple inexpensive disposable valves to specialized valves which cost thousands of US dollars per inch of the diameter of the valve.
Disposable valves may be found in common household items including mini-pump dispensers and aerosol cans.
A common use of the term valve refers to the poppet valves found in the vast majority of modern internal combustion engines such as those in most fossil fuel powered vehicles which are used to control the intake of the fuel-air mixture and allow exhaust gas venting.Źródło: https://en.wikipedia.org/wiki/Valve
Overview of the state of water and sanitation in the school A very important project carried out in built school is equipping it with a functioning network plumbing.
Responsibility for the good execution of the plan created previously borne by the administration building, and then selected by the administrative authorities, the director of the school. It should also ensure that the school building was carried out a review of the state of water and sanitation, especially during the holiday season and, if necessary, during the school year. Performance of plumbing repairs in the school can deal with an emergency plumber or hydraulic depending on the type of failure. Therefore, to carry out such repairs may involve the need to close only one of the toilets or the entire school building.
Plumbing code is a code that provides regulations for the design, installation and inspection of building plumbing and sanitary systems.
In the U.S., jurisdictions enact their own codes, some of which are based upon model plumbing codes.1 The most widely adopted plumbing code in the United States is the International Plumbing Code published by the International Code Council (ICC).
This code is also used as the basis for the plumbing code of some other countries. Another model plumbing code published in the United States is the Uniform Plumbing Code published by IAPMO.Źródło: https://en.wikipedia.org/wiki/Plumbing_code