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.
Elastomer Seated Valves. 1  Elastomers include Teflon*, Viton*, Neoprene, Buna, EPT, and other commercially available elastomers. 2  Designs for low pressure gas and liquid handling systems means lower operating torques which reduces the cost of actuation packages. Elastomers include Teflon*, Viton*, Neoprene, Buna, EPT, and other commercially available elastomers. 2  Designs for low pressure gas and liquid handling systems means lower operating torques which reduces the cost of actuation packages.