Non-Return Valves

The inventive non-return valve comprises a valve body which defines an internal fluid through-opening extending along the longitudinal axis of the body, comprising a seat body defining a valve seat arranged in said through opening and a closing body which is axially displaceable in the through opening oppositely to a closing force produced by a closing spring between a closed position applied to the seat body (and an open position lifted from the valve seat on the closing body, wherein the valve body forms a guide along which the seat body is axially displaceable in different adjusting positions corresponding to the desired preloads of the closing spring and, consequently to the desired adjustments of the closing force quantity of said closing spring.

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