| 摘要 |
A flapper valve assembly is provided, of the type preventing downward fluid flow when the flapper is closed, which is sized, shaped and configured to provide a smaller maximum outer diameter to minimum internal diameter ratio, thus allowing a larger minimum ID for a given maximum outside diameter, when compared to currently available flapper valve assemblies. An insert assembly is used in the modular saddle flapper valve assembly which has a flapper seat, flapper valve and sleeve. The insert assembly is secured within a tubular housing and enclosed by standard top and bottom subs, either sub being easily removed and replaced with a sub having a different thread size or type, the removal being easily accomplished without disassembly of the insert assembly.
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