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.
Valves can be categorized into the following basic types: 1  Ball valve, for on/off control without pressure drop, and ideal for quick shut-off, since a 90Â° turn offers complete shut-off angle, compared to multiple turns required on most manual valves. 2  Butterfly valve, for flow regulation in large pipe diameters.