(57) A check valve for use in for instance floor sinks, concrete manholes, in sewerage
plants etc., comprising a valve box (2) having an upper inlet (3) and a lower inlet
(4) and a valve seat (5) near the upper inlet (3) meant to act in conjunction with
the upper section (1a) of a moveable valve body (1) in the case of rising water level,
i.e. the check valve. The valve body (1) is preferably bush shaped and forms a flow
opening (1b), the upper section (1a) of which is connected to the upper inlet (3)
by means of a flexible sleeve (6). The lower section (1c) of the bush is at a distance
from the upper section (1a) and juts down into any rising water or down into a basin
so as to form a gully trap. The valve seat (5) is placed independently of the periphery
(3a) of the opening of the upper inlet (3) in the valve box (2), and may in two different
embodiments be placed in the shape of a disk (5a) centrally in the opening of the
inlet (3) and held by means of struts (7), or to the side of the periphery (3a) of
the opening of the inlet (3) when the inlet (3) is laterally directed or horisontal.
The actual closing of the check valve occurs when the sleeve, because of trapped air
in the case of a rise in the water level, is pressed up together with the valve body
to rest against the valve seat, whereby the sleeve covers the inlet (3).
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