Mother's Day is a celebration honoring mothers and celebrating motherhood, maternal bonds and the influence of mothers in society. It is celebrated on various days in many parts of the world, yet most commonly in March, April, or May.
Coils, rings, and corrugated ribbon are the common forms of packing used in valves. The form of packing to be used in repacking a particular valve will depend on the valve size, application, and type. Packing materials will be discussed in more detail later in this chapter.
Diaphragm valves (or membrane valves) consists of a valve body with two or more ports, a diaphragm, and a weir or saddle or seat upon which the diaphragm closes the valve. The valve is constructed from either plastic or metal. Originally, the diaphragm valve was developed for use in industrial applications.