Variable flow control valve

The present invention relates to a valve having a housing with a flow channel, a substantially spherical or spherical or conical or cylindrical plug-in closure fitted with a rotatable duct and preferably seals fitted on both sides of the closure between the closure and the housing, and which is mounted in a perpendicular position against the longitudinal direction of the passage and guided through the valve wall to the outside of the valve by means of a sealing sleeve and a fluid flow damping device

It has previously been known to place other flow damping devices in addition to valves in flow channels, such as pipelines, to divide the pressure drop into several stages. It is also known to provide the valve closing member with a torn plate-like additional flow damper which is in a transverse position with respect to the longitudinal direction of the flow channel of the closing member. Such flow damping devices are disadvantageous when the valve is fully open, since even then they limit the flow capacity. If, on the other hand, there is no or little damping, this will cause cavitation, vibration, noise and wear in the valve for substances in the valve at high pressure ranges.

as a result of assembly

The object of the present invention is to provide a valve with a flow damper which is better than previously known valves, in which the damping device dampens the flow at all when the valve is fully open, i.e. the valve acts like a non-damped valve of a similar size, but with strong flow control; large and attenuation is most needed.

The valve according to the invention is mainly characterized in that the ends of one or more parallel and spaced damping plates protrude to or very close to the surface of the closure cord pattern surface and shapes of the outer surface of the rotation pattern and that the damping plate or plates have holes or openings passing through the plate in a manner known per se.

The invention will become more apparent from the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 shows a longitudinal section of a spindle valve according to the present invention; in the closed position, Fig. 3 shows the valve of Fig. 2 with the closing member in the open position, Fig. 4 shows an alternative embodiment to the valve structure of Figs. 1-3, in which the damping device consists of several parallel damping plates, and Fig. 5 shows an embodiment of the valve according to the invention,

The valve according to Figures 1-3 comprises a valve housing 1 and a valve closing member 2 therein, which is spherical and through which extends a bore or channel 3 having the same diameter as the valve 3.

5 6 5 6 on both sides of the member 2 with a fluid flow slot 4 of circular cross-section in the valve housing 1. In Figures 1 and 2 the valve is in an almost closed position, whereby the bore or channel 3 is respectively almost transverse to the west flow slot 4.

The closing member 2 is associated with a stem 9 having the same base as it. The valve housing 1 is associated with a sealing structure for the outlet of the stem 9, comprising a so-called a box seal 10 and a sealing sleeve 11. By pressing the sealing sleeve 11 into the front part of the sealing structure by means of holes or the like, the seal 10 placed around the mandrel 9 is pressed against the mandrel 9 and the housing part.

On both sides of the closing member 2, annular recesses 12 are made in the housing 1 transverse to the western flow slot 4, to which sealing rings 5 ​​are arranged.

A damping plate 6 is fixedly attached to the bore or channel 3 of the closing member 2, the ends of which protrude up to the level of the surface of the lacing pattern of the closing member 2 or very close to the surface of said lacing pattern. The inner surface of the valve housing 1 in the part 7 between the seals 5 is shaped to correspond to the shapes of the outer surface of the lacing pattern of the closing member 2 with a small clearance. The damping plate 6 has holes 8 or openings passing through the plate over the entire area of ​​the plate. In the case of Figures 1-3, the damping plate 6 is parallel to the bore or channel 3 of the closing member 2, located centrally in the bore or in the hole 3, at the spindle axis 9. Although Figures 1 to 3 show the arrangement of the damping plate 6 in the recess or channel 3 of the closing member 2 as described above, the invention is by no means limited to such an arrangement, but the damping plate 6 can be installed in many different ways.

Figure 4 shows a valve in which the damping device consists of three parallel, parallel and spaced damping plates 6. In such an application it is preferred that the holes 8 or openings in the two parallel damping plates 6 are at different points, i.e. not aligned. For example, when damping compressible materials, the holes 8 or openings can be made, if necessary, so that the opening area of ​​the first damping plate in the flow direction is the smallest of the total damping plate surface area and said opening area in the flow direction of the damping plate increases. The above thus means that the plate from the plate grows in the entire flow direction of the holes 8.

In high-pressure valves, especially for compressible substances, it is advantageous to shape the bore or channel 3 of the shut-off element 2 in a manner known per se, as in Fig. 5, so that the cross-sectional area of ​​the groove or channel 3 on the flow inlet side is smaller or narrower. When the bore or channel 3 of the closure member 2 is shaped according to Fig. 5, it is advantageous to start perforating the damping plate 6 or plates on the inlet side only at the smallest cross-sectional area of ​​the bore or channel 3 and route the plate or plates to the discharge side.

When the valve according to the invention is opened from the closed position by turning the closing member 2 by means of the stem 9, the damping plate 6 covers the flow channel well (Fig. 2) and almost the entire amount of material passing through the holes 8 or openings in the damping plate 6; only a small part passes through the narrow gap between the ends of the damping plate 6 and the wall 7 of the valve housing 1. The more the valve is opened, the lower the damping power of the damping plate 6, in which case the proportion of the flow of material past the damping plate 6 increases from the total flow. In said open position, the damping plate 6 or plates of the valve closing member are effectively cleaned of possible debris and contaminants by the flow of material.

Although the structure according to the invention has been described above as being applied to a ball valve, it can of course be applied equally well to stopcocks.