A NON-RETURN VALVE

摘要

The present invention relates to anon-return valve (1) for a liquid piping system, comprising a valve housing (2) and a valve member (3), which is movable between a first position, in which a flow path is blocked, and a second position, in 5 which the flow path is unblocked. The non-return valve (1) comprises a non-return valve attachment (6) comprising a housing (7), a piston assembly (9, 10) and an energy storing means (11), the piston assembly being axially movable in relation to said housing (7) between a first active position, 10 and a second position. In said second position the fluid pressure of said liquid drives the piston assembly against the action of the energy storing means (11) away from said first position, such that the valve member (3) is movable into said second position of the valve member (3).