Metallic Bellows Stem Seal for Model 988 Control Valve in Chemical Ser vice
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Description
The Cashco Model 988-MB is a variation of the basic Cashco Model 988 globe-style control valve that in cor - po rates a metallic bellows stem seal. The purpose of the design is to maximize the reduction of fugitive emissions of hazardous fl uids in the chemical industry from one of the most common sources - conventional control valve stem packing. The bellows is designed conservatively, in that there are a relatively large number of convolutions to keep bellows internal stresses to the lowest practical levels, optimizing expected cycle life, and minimizing effects of bellows "snaking".
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Metallic Bellows Stem Seal for Model 988 Control Valve in Chemical Ser vice
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