Importance

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Abstract

A back pressure flap valve arrangement is disclosed. The arrangement comprises a housing (101) having an inlet opening (102) and an outlet opening (103) adapted for connection of the housing (101) to a ducting (200), and at least one side wall (104) extending along a flow direction through the housing (101) from the inlet opening (102) to the outlet opening (103). A flap (1) is pivotably hinged about a shaft (5) thereby being movable between an open position and a closed position, said shaft (5) extending transverse the flow direction. At least one locking device (10) is fixedly mounted to the side wall (104) and comprises a locking pin (14) and a stopping member (12). The locking pin (14) is movable between a retracted position and a locking position, and being biased towards said locking position. The stopping member (12) is movable from a stop position in which the stopping member (12) is adapted to hold the locking pin (14) in its retracted position, to a release position by the flap (1) acting on the stopping member (12) in case of a back pressure. Thereby the locking pin (14) is allowed to move into the locking position in which the locking pin (14) maintains the flap (1) in the closed position.

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First Claim