SK171398A3 - Gate valve - Google Patents

Abstract

A closure (1) comprises a slider housing (2) and a closure wedge (5) which is held by side guide members (7) along grooves (8) arranged laterally w.r.t. the direction of flow. The wedge has a sealing rubber elastic mantle (9) and the guide members are arranged at mid height.

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a closing slider with a sliding sleeve and a closing wedge, wherein the closing wedge is guided by laterally extending guide blades sliding along the sliding sleeve guide grooves extending transversely to the flow direction and having a sealing rubber elastic sheath.

BACKGROUND OF THE INVENTION

To date, the closing wedges of such a closing slider are articulated on the actuating spindle, due to the displaceable adjustment in the height region of the articulated connection, guided laterally and in the region of the actuating spindle, the vulcanized circumferential casing providing a wedge seal. It has now been shown that these wedge guides bring with them the load-induced angular position of the closure wedge and thus the unfavorable force transmission ratios, which results in rapid wear especially in very frequent use. In addition, the rubber elastic regions of the casing on the sliding surfaces are made relatively thin-walled for functional reasons, and these coatings are therefore also subject to rapid abrasion. In addition, the closure wedge body itself, outside the rubber sheath, is at risk of corrosion, further reducing service life.

According to EP 0 146 112 A, a closing wedge has also been proposed for a closing slider which, for protection against corrosion, is generally provided with a rubber elastic coating, on the other hand being guided grooves on the narrow sides sliding on guide rails fixedly mounted on the housing. In order to improve the sliding properties, a special slide is additionally inserted into the guide grooves, and relatively long guide grooves are required in order to achieve adequate support stability. However, due to the arrangement of the grooves, the inclination of the wedge caused by the load is not prevented and the susceptibility to wear remains very high, so that due to the necessary insertion of the slide the considerable production costs still have to be taken into account.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a shut-off slider of the type described at the outset which, at relatively low construction costs, is characterized by high corrosion protection, good sliding guides and, in particular, its wear resistance.

The invention solves this problem by arranging the guide lamellae on the closure wedge at a height of the center of the closure wedge surface projected in the direction of flow on the closure wedge, and the closure wedge casing forms a closure wedge cover in a known manner. By guiding the slats, displaced downstream of the previous closing wedges, the guide is placed at the height of the wedge force resulting in a skewed position of the wedge caused by the load practically without great expense. A comparatively short wedge guide is sufficient, which nevertheless leads to excellent wear resistance of the slider system. Further, the direct position of the wedge, parallel to the guide, results in an easy running of the sliding guide, since there are no perceived effects and the like, and thus reduced actuation moments additionally improve the susceptibility to wear. The closed casing of the sealing wedge protects the wedge body, which consists of cast iron, in particular ductile cast iron, reliably against corrosion. nitrile rubber).

To achieve high wear resistance also in the guide area, guide plates made of plastic, resistant to wear and to temperature changes, such as POM (polyoxymethylene), are inserted on the guide plates, which prevent premature sheathing in the area of the guide plates and can be easily replaced.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail by means of specific exemplary embodiments shown in the drawings, in which FIG. 1 and 2 according to the invention, the shut-off slide according to the invention is in the axial normal, respectively.

axial cross-section, wherein the closure wedge is in the closed position on the left half of the figure and the open position in the right half of the figure; and FIG. 3 is a cross-sectional view of the wedge according to line III-III; FIG. 1, on a larger scale.

DETAILED DESCRIPTION OF THE INVENTION

The closing slider 7 comprises a sliding sleeve 2 with an upper part 3 attached, as well as a closing wedge 5, movably adjustable by the actuating spindle 4 rotatably mounted in the upper part 3. This closing wedge 5 can be moved transversely to the flow direction S opening 6 of the housing 2, from the lower closing position (left half of FIGS. 1 and 2) to the upper open position (right half of FIGS. 1 and 2), the closing wedge 5 engaging the lateral guide grooves 8 of the slider a housing 2 extending along the displacement direction R. The guide plates 7 lie at the height M of the closure surface F of the closure wedge 5 projected in the direction of flow S on the displacement plane E, so that the compressive forces of the flowing medium acting on the closure wedge do not cause any tilting moments. Avoid increased wear.

As protection against corrosion, the closing wedge 5 is provided with a sheath 9 of EPDM or NBR covering the entire wedge body. In addition, in order to improve the sliding properties and to increase the wear resistance of the guide plates 7, the guide covers 10 of POM are inserted.

Claims (2)

PATENT CLAIMS Closing slide (1) with a slide sleeve (2) and a closing wedge (5), wherein the closing wedge (5) extends laterally by projecting guide plates (7) sliding along the guide grooves (8) of the sliding sleeve (2) extending transversely to the flow direction (S), and has a rubber-elastic sealing sheath (9), characterized in that the guide plates (7) are arranged on the closure wedge (5) relative to the direction (R) of its displacement at the height of the closure center (M) The surfaces (F) of the closure wedge (5) projected in the flow direction (S) to the displacement plane (E) and the sheath (9) of the closure wedge (5) form a closed closure wedge cover in a known manner. Closing slide according to claim 1, characterized in that guide plates (10) of wear-resistant and temperature-resistant plastic, for example POM (polyoxymethylene), are inserted onto the guide plates (7).