FIELD: machine building.
SUBSTANCE: group of inventions relates to valve units. Flapper valve modules and appropriate flapper valve units are described. Under one option the flapper valve module contains a body with one or more sealing surfaces, seat and through channels from the seat to the sealing surface. The flapper valve module also includes one or more flaps. Under some options the module additionally contains the flaps limiter. New flapper valve units containing the flapper valve modules are described. One option of the flapper valve unit implementation contains the seat with multiple through channels, stop plate with multiple through channels, and device for receiving recesses between the seat plate and stop plate. Also other devices, systems and methods linked with the flapper valve modules and valve units are described.
EFFECT: group of inventions increases cost effectiveness and reliability of the valves.
33 cl, 15 dwg
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