Valve

BACKGROUND OF THE INVENTION The present invention relates to a valve having a valve body having a flow orifice and in which a plug cone formed in the form of a spherical, conical, cylindrical or segmental closing body is rotatably mounted, the two sides of the closing body being the seat and the closure member are provided with a spindle, · fixed in a perpendicular position to the flow opening and passing through the vein wall to the outside with a seal provided with a seal, wherein in the through hole or channel of the closure member there is provided a pusher piece through which the flow of the substance through the throttle valve is melted.

The prior art gas or liquid conduits are provided not only with shut-off valves, but also with throttles to divide the pressure drop over several degrees. It is also known that the closure members and plugs are provided with additional perforated plates, which represent a widening device and which are positioned transversely to the direction of flow of the liquid or gas by the closure member. These throttling means are disadvantageous when the valve is fully open, since in this case the throttling means reduce the maximum flow rate of the vein. On the other hand, if the valve is not provided with throttling or if the throttling effect is inadequate, cavitation occurs in the valve resulting in vibrations, noise and wear of the parts of the vein, particularly at high pressures and in the transport of compressible substances.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved design having a throttle device which, when fully opened, limits the flow of the valve only slightly, so that the function of the vennel remains similar to that of the non-throttled valve. Intensive in the control range of the vein, in which the pressure drop is large and in which the throttling effect is the same.

This object is achieved by a valve according to the invention, characterized in that its throttling device, reducing the flow in both directions of flow of the conveyed substance, consists of at least one throttle plate fixedly fixed in the flow opening of the closure member, parallel to any other burrs. the plates and at a distance therefrom, the ends of these throttle plates or of the clothes plate up to or near the rotation surface, the peripheral surface of the closure member is pivoted to engage the surface of the ventilator body. The spacing between the two seat rings has a shape corresponding to the exterior surface of the closure member and the rotational surface in which the surface of the closure member rotates, wherein holes are formed in the nipple plate or in the nipple plates perpendicular to the median plane of the plate or plates.

1 shows a longitudinal section through a valve according to the invention, taken along a plane through the valve stem and through a flow channel in which a ball shut-off member is accommodated, FIG. 2 shows a longitudinal section through a throttle valve according to the invention; taken along a plane passing through the center of the flow channel and perpendicular to the spindle axis of the vein, the closure member being almost fully closed, FIG. 3 the same cross-section of the valve whose closure member is fully open, FIG. 4 an alternative embodiment of a longitudinal section of the vein taken in the same plane as in FIGS. 2 and 3, the throttle orifice consisting of several throttle plates arranged parallel to each other; and FIG. 5 shows an exemplary embodiment of a vein according to the invention, the closure member of which is provided with a flow channel, the cross-sectional area of ​​which is less than the downstream of the conveying substance. In FIG. 6 1 is a side view of a valve closure member in the direction of the flow channel axis, the closure member being provided with a throttle device different from the preceding examples shown in FIGS. 1 to 5; 6 is a side view of the closure member in the direction of the axis of the flow channel provided with a throttle device of a different construction from the examples in FIGS. 1 to 5; FIG. 9 Fig. 8 is a cross-sectional view of the closure member taken along the line VIII-VYII of Fig. 8, which is a side view of the closure member provided with another exemplary throttle device different from the embodiment of Figures 1 to 9; Fig. 12 is a side view of the cut-off closure member taken in a direction perpendicular to the longitudinal axis of the flow passage, the closure member being provided with another throttle member, different from the examples of Figs. 11, FIG. 13 Fig. 12 is a cross-sectional view of the closure member taken along line XII-XII in Fig. 12, and Fig. 14 is an alternative exemplary cross-sectional view of the closure member taken along line XII-XII in Fig. 12.

The throttle valve according to the invention (FIGS. 1 to 3) consists of a valve body 1 having a substantially spherical shape and a closing member 2 which is located inside the ventilator body 1 which is also of a spherical shape and through which the flow channel J passes. the diameter of which is equal to the diameter of the flow opening 6 formed in the ventilator body 7 on both sides of the closure member 2 and having a circular cross-section. In FIG. 1 and 2 is a valve almost in a closed position, in which the longitudinal axis of the flow passage or bore is substantially perpendicular to the junction of the inlet and outlet holes.

The closing member 2 provided with the flow passage 4 is integrally formed with the spindle 4 of the outside. The valve stem extends through the wall of the valve body 6 and is sealed therein by a sealing assembly consisting of the gland packing 54 and the gland packing. Upon pushing the seal 11 into the valve body 6 towards the sealing assembly, for example by a screw or equivalent, the seal seal is provided. positioned around the spindle 4, presses the spindle 4 and the wall of the opening in the venting body 4.

On both sides of the closure member 2 within the ventilator body 8, annular recesses 52 are formed in a plane perpendicular to the spoon of the inlet and outlet openings 8, in which the seat rings 4 are mounted and fastened.

The throttle plate 6 is fixedly fixed in the bore or flow channel 6 in the closure member 2, its free edges reaching up to the rotational surface in which the peripheral surface of the closure member 2 rotates, possibly even in close proximity thereto. The inner surface of the valve body 8 has a shape between the valve seat rings 8 which corresponds to the shape of the outer peripheral surface of the closure member 2 and the rotational surface in which it is formed. ·. the circumferential surface of the closure member 2 is pivoted, with little clearance between this rotational surface and the inner surface of the valve body 6 in the region 6. Holes 6 are formed in the throttle plate 6 extending through the throttle plate 6 and distributed over its entire surface. 1 to 3, there is a throttle plate 6. parallel to the axis of the flow channel 4 of the closure member 2 and is disposed in a plane intersected by the center of the flow channel 4 and the spindle 6. Although in the examples shown in FIGS. 1 to 3, the mounting of the throttle plate 6 is shown as described, the solution according to the invention is by no means limited to such a type of mounting, but the throttle plate 6 can be placed in as many other positions. .

FIG. 4 shows an exemplary embodiment of a vein according to the invention, wherein the device comprises three throttle plates arranged side-by-side parallel to each other and spaced apart. In such an exemplary embodiment. it is preferable that the apertures are formed. formed in adjacent throttle plates 6, are located at different locations and offset from each other, not positioned opposite each other. If desired, for example in the case of throttling of the conveyed materials, the apertures 8 may be provided. positioned so that in the flow direction, holes 8 are formed in the first throttle plate 6, the overall pJ-Ooha being the smallest and in proportion to the total area of ​​the throttle plate 6 forming a small portion, the sum of the areas of the holes 8 increasing in the other throttle plates 6, located in the flow direction. That is, the size of the holes 8 for each successor of the throttle plate 6 increases compared to the size of the holes 6 of the previous throttle plate 6.

Especially in the case of high-pressure venates intended. For compressible substances, it is advantageous, as is well known, to form the flow channel in the closure member 2 in the shape shown in FIG. 5, whose cross-sectional flat is smaller or narrower on the inlet side than on the outlet side. The flow channel 4 of the closure member 2 has the cross-sectional shape shown in FIG. 5, it is preferable to start with the throttle plate 6 punched in the flow direction of the conveyed material up to the point at which the smallest diameter of the flow passage 2 is at least 221959, the holes 6 being provided with the entire surface. 2 in the flow direction.

If the valve according to the invention is opened from the closed position by pivoting the closing member 2 by means of the spindle 2, in the first phase the flow opening remains fully closed by the stator plate & and only a very small amount of conveyed material flowing through this partially open valve The surface of the material to be conveyed may flow through a narrow gap between the plate and the central part of the inner surface of the wall of the valve body. The more open the wind, the less the influence of the stator plate and the smaller the proportion of the material flowing through the holes & the stator plate, the smaller the amount of the material flowing through the vent. When the vetol is in the open position, the stator plate no longer restricts the flow of the fabric through the vent, being positioned parallel to the flow of the fabric and allowing flow through almost full capacity. When the veenil is fully open, the stator plate or the plurality of throttle plates 6 lying parallel to the flow of material is effectively cleaned of any foreign particles or particles that may have been trapped on it in the previous stages. .

In these exemplary embodiments, the invention has a spherical closing device ^andlenem^, but still ^tand^to can ^bThe closing ften 2 is formed in the form of a drawbar. The plates 6 may not be the same. shaped and curved Static plates which may have a cylindrical surface (FIGS. 6 and 7) or may be curved in the direction of the longitudinal axis of the flow channel 2 (FIG. 14), or may be 8 or 9, or other combinations of these base doors can be formed (FIGS. 10 and 11). The aging plate may also be a planar network formed of bars or wires arranged in a grid (FIGS. 12-14).