9-1
Chapter 9. Instructlons for Bellows Sealed Type of Control
Valves
The bellows sealed type of control valves differ from other control valves in that the former
employ a bellows for seal. This chapter covers primarily the particular items
related to the bellows sealed type of control valves.
Note: The bellows seal assembly should be replaced periodically. The frequency of
replacements depends on the conditions of use. When handling a mechanism which as
a bellows seal assembly, exercise care so that the mechanism is not twisted. Note that the
bellows is not highly resistant against torsion.
9-1. Model HLS control valves
9-1-1. Structures
The handling methods of Model HLS Control Valves differ as the shapes of their ports
differ depending on, Cv values and on whether they are provided with a PTFE insert or
not. The structures of typical valves are shown in Figure 9-1 and Figure 9-2.
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