Miscellaneous

Abstract

There are several equations and calculations which are discussed in this chapter, which relate to joint efficiency and valve sealing. Joint efficiency is an important concept because it refers to a valve's ability to provide a secure seal between metallic components, such as the body and bonnet, to prevent leakage. This chapter examines three joint efficiency conditions: welded joints, bolted joints, and threaded joints. It is essential to understand that welded joints are defined by their efficiency. So, in some literature, the term “welding joint efficiency” is used. The weld joint efficiency is an expression of the relationship between the strength of the welded part and the strength of the base material. Next, two bolted and threaded joints are discussed. The first is the bolted or threaded joint of the bonnet or the cover, and the second is the bolted or threaded joint of the body. In the end, some essential calculations related to stem sealing are discussed, including the stem-sealing ability.