Throttle valve assembly for the fiber suspension flows at a papermaking or cardboard prodn machine has inlets for two or more incoming flows to prevent fiber clogging and stoppages

摘要

The throttle valve (1), for the flow of a fiber suspension at a papermaking or cardboard prodn. machine, has a side inlet (3.1) for a fluid flow into the valve zone (2) and at least one further inlet (3.2) for the feed of an additional fluid flow into the valve zone (2). The additional inlet (3.2) is upstream of the narrowed section formed by the valve rod (4). The additional inlet (3.2) is at the side of the valve structure. The inlets (3.1,3.2) give an alignment to the incoming fluid flows, with a direction component which is oriented at a tangent to the center axis (6) of the valve zone (2). On entry into the valve zone (2) from the inlets (3.1,3.2), the fluid flows are at right angles on a plane where a part vol. forms the center axis of the valve zone (2), with an entry angle of 2-25 deg on the plane and pref. 5-15 deg . Two inlets (3.1,3.2) deliver two fluid flows. The valve rod (4) has an expanded section (4.1) at the valve zone side. At least one fluid inlet (3.1,3.2) has a throttle action, pref. as a throttle valve (7.1,7.2), with a variable flow cross section into the valve zone (2). A further cylindrical zone (5) is at the conical section (2.2) of the valve zone (2), pref. as a pipe channel.