Valve

The present invention relates to a valve comprising a housing provided with a flow channel and a flow-free orifice closure member, such as a flap or ball cap, reversibly or rotatably mounted on the pivot shaft in the flow channel, and cooperating sealing members arranged between the closure member and the valve housing, if necessary.

DE-A-2 359 717 describes a valve in which a damping member with channels or openings is used, which is perpendicular to the plane of the closing member. However, such a structure significantly reduces the flow capacity of the opened valve, so that a valve with a certain capacity becomes large in size.

It is an object of the present invention to provide flow damping in butterfly valves or other valves with non-orifice closures without increasing the size of the valve.

The valve according to the invention is mainly characterized in that one or more parallel damping plates spaced apart from each other and parallel to each other on both sides of the closing member, parallel to the plane of the closing surface of the closing member and a perforated or multi-opening inside the surface of the rotation pattern.

The invention will become more apparent from the following description and the accompanying drawings, in which Figure 1 shows a flow damper of a butterfly valve 1a Fig. 3 shows a valve with a flow-damped wall valve with a valve 1 in a sectional view in the longitudinal direction of the axis of rotation of the closing member with the closing member partially open, and Fig. 4 shows the valve of Fig. 3 with the closing member inverted into the valve through the flow channel

The butterfly valve of Figures 1 and 2 comprises a housing 1 with a circular flow channel 3 in cross-section, into which a pivotable closing member or flap 2 is fitted by means of a stem or pivot shaft 8. The pivot shaft 8 is arranged in the middle of the flow channel 3 and mounted on both sides of the housing. as shown in Figures 1 and 2. From the other end of the housing 1, an annular extension 4 is made on the inner surface of the flow channel 3 of the housing 1, which extends close to the axis of the valve. A sealing ring 6 is arranged against the bottom of the extension 4, which may have a U-shaped cross-sectional shape which opens, for example, towards the bottom of the sealing groove 7. Sealing groove. 7, the second edge is formed by a support ring 5 which is fitted to the extension 4 of the flow channel 3 as shown in Figures 1 and 2. In detail, the butterfly valve of Figures 1 and 2 may have a basic structure in accordance with, for example, Finnish patent 54536.

In the embodiment of Figures 1 and 2, a perforated damping plate 9 is attached to the inlet side of the flap 2 and three perforated damping plates 9 are attached to the flow outlet side of the flap 2. Of course there may be one or more damping plates 9 and may be located in different proportions on all or all of the flap 2 the damping plates 9 can, oh, freeze on either side of the flap 2. All the damping plates 9 are entirely inside the surface of the rotational pattern of the flap 2, which is thought to be relative to the pivot axis 8 of the flap 2. In the case of Figures 1 and 2, the damping plates 9 are parallel to the flap 2 and spaced from the flap 2 and apart. Fastening holes pass through the damping plates 9 and the flap 2, in which fastening bolts 10 or other fastening nails are placed. The gaps between the damping plates 9 and between the damping plates 9 and the flap 2 are formed by means of spacers 11 or other means. Of course, the damping plates 9 do not have to be parallel to or with each other in the flap 2, but can equally well be mounted in the desired oblique position to form an angle with each other and / or with respect to the flap. The damping plates 9 do not have to be straight planar plates either. The damping plate may also consist of a screen plate similar to a net assembled from rods or wires. Each damping plate 9 has holes 12 or openings through the plate distributed over the entire area of ​​the plate. When the valve I has several parallel damping plates 9, it is most advantageous that the holes 12 or openings in the two mutually parallel damping plates 9 do not align. More suitably, the opening area of ​​the holes 12 or openings away from the plate from the flap 2 increases.

When the valve according to Figs. 1 and 2 is opened, the damping power of the damping plates 9 is initially high, but the more the valve is opened, the lower the damping power of the damping plates 9, since the proportion of the total material flow passing the damping plates 9 increases. When the valve is in the open position, the damping plates 9 are no longer damped, but are located in the direction of flow, allowing the valve to operate at almost its full capacity.

Figures 3 and 4 show an alternative embodiment to the valve of Figures 1 and 2, in which the closing member of the valve is a ball cap and the damping plates are located only on one side of the closing member. Figures 3 and^Bin the embodiment, the counterparts have the same reference numerals as in Figs. 1 and 2, but with apostrophes.