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.
Common Types. â¢ Butterfly Valves. Butterfly valves use a similar principle to ball valves. However, instead of a ball mounted in the valve body a. circular disc (called a butterfly because the two half. circles around the vertical shaft appear like wings). Again the orientation of the butterfly determines the.