DE1970314U - PLATE WEDGE FOR GATE VALVE. - Google Patents

Description

BOPP & REUTHER GMBH 11092a MANNHEIM-WALDHOF - -

Pat Ro / Sch

Plate wedge for gate valve

The innovation relates to gate valves without a housing with an elastic seal on the outer jacket, "the one with their upper part runs around the wedge and relates to an improvement of the plate wedge in terms of its sealing compared to the housing in the closed state.

Known slides of this type have a plate wedge in which a sealing strip is provided when the spindle and wedge are arranged vertically is pressed radially outward on the wedge upper part by a pressure piece in the "closed position" and thereby against the associated Seats in the housing come to rest. The lower part of the Wedge with a semicircular end part has sealing strips on the outer edge, which press against the housing wall when closing due to the conicity of the wedge. A disadvantage is shown in these known slides that a considerable pressure are applied by the pressing of the upper transverse part of the seal must, in the course of time, to deform the seal leads and causes considerable wear on the sealing material. There are still gate valves "known in which an O-input inserted into a groove in the upper part of the wedge seals radially to the spindle axis, but also in the lower part axially, i.e. in the direction of the spindle, comes to rest. In these plate wedges, too, the transition from the lower one shows semicircular shaped part of the wedge to the inclined, straight edge a significant wear on the seals, so that the plate wedges no longer close tightly after a shorter or longer period of time. The usual fixings of the 0-B.inge are in the throttling position of the shut-off wedge is not sufficient for the "flow velocities" occurring.

These and other disadvantages of the known designs are through the innovation corrected., It is characterized by the fact that the sealing ring vulcanized into a groove in a manner known per se in the upper part over about two thirds of its total sealing surface essentially in the direction of flow, in the lower part Part seals about a third perpendicular to it.

In the drawing, an embodiment of the inflation is illustrated. Show it?

Figo 1 is a vertical section through the plate wedge in the plane of the central axis transverse to the direction of flow,

Pig. 2 a vertical section in the plane of the central axis lying in the direction of flow,

fig. 3 is a plan view with a horizontal section through half of the plate wedge in the area of the guide rails,

Pig. 4 a section through the transition point from the semicircular lower to the conical middle part of the wedge and

Pig. 5 a section a little below that in the Pig. 4 section shown.

The plate wedge 1, which is designed to be hollow in a manner known per se, has a recess 3 for receiving it on its upper shoulder 2 the spindle nut. Irr Drauf sees it is roughly oval or elliptical and has on part of its outer edge guide strips 4, which are in a recess of the Housing 5 slide (see. Pig. 3> left half). Instead of the Guiding ribs are arranged on the plate wedge, it is

possible to arrange them as strips 6 in the housing. In this Pail guides 7 are then provided on the plate wedge (cf. Fig. 3, right half). The plate wedge is provided below "the upper approach 2 mi flood 8, in which an elastic Sealing ring 9 is vulcanized in, which forks into two strands 10 in the upper part of the plate wedge 1. This fork begins below the guide rails 4.

The one-piece strand 9 of the sealing strip 9, 10 can be at the transition point, as shown in ~ Fig. 4 visible instead of on its outer bearing surface to be flat, either have a convex curvature 11 or a concave 12.

The sealing strip 9 »10 of the plate wedge 1 is in the upper part essentially sealing in the flow direction through the operating pressure, in the lower, smaller part, however, across it the spindle pressure. It is crucial that the transition from one 'sealing direction to the other at the' Position 13 is. "The latter lies below the guide strips 4, and the part sealing transversely to the direction of flow is about one third of the total length of the sealing strip. The other two thirds extend over the upper part of the plate wedge "1.

The sealing strip 9 »10 can be a closed at its edge Strand be vulcanized into the grooves 8, but it can also be carried up between them on the outer edge of the plate wedge Strands must be connected by a thin layer that extends over the entire outer surface of the plate wedge 1

The hollow interior 14 of the plate wedge is advantageously connected to the outside at its deepest point. to for this purpose it has a bore 15 which also runs through the sealing strip 9.

Claims (6)

P / i U U η H ί * "π H η / _ 4 - protection requirements 1.) Plate wedge for gate valves without a housing with a elastic seal on the outer jacket, the upper part of which runs around "the wedge, characterized in that that the sealing ring vulcanized into a hat in a manner known per se in the upper part over about two thirds its entire sealing surface essentially in the direction of flow, in the lower part to about a third "perpendicular to this poetry. 2.) plate wedge according to claim 1, characterized in that the guide ribs are arranged on the plate wedge and of the one-piece sealing body underneath can be bypassed in a forked form. 3.) plate wedge according to claim 2, characterized in that the guide ribs on the plate wedge as a single or double guide Üngsleis th are trained. 4.) Plate wedge according to claims 1 to 3, characterized in that the sealing surfaces at the transition point from the axial to the radial sealing direction "are convex on the outside. 5.) plate wedge according to claims 1 to 3, characterized in that that the sealing surfaces at the transition point from the axial to the radial sealing direction are "curved concave on the outside are. 6.) plate wedge according to claim 1 and one or more of the following, characterized in that the hollow interior (14) of the plate wedge from its lowest point, preferably in the form of a bore (15)? connected to the outside *