DE1087858B - Gate valve with ring seal and pressure device for the ring seal - Google Patents

Description

GERMAN

The invention relates to a gate valve with an annular seal, that is to say with one or more, preferably two arranged in the slide plate, in the closed position by a pressure device the housing seats press-on sealing rings, and has set itself the goal of using sealing rings elastic material from the strong deformability of the compressible material for sealing the valve plate to make use of the pipe connection socket in the valve body in such a way that the elastic sealing rings are guided during the stroke movement with play in front of the housing sealing surface and only in the closed position to the extent that their outline shape can be changed by upsetting them so that they form a seal cling to the housing. When the operating spindle is moved in the opening direction, the upsetting effect is activated canceled, so that the sealing rings then first lift off the housing sealing surface before the Slide plate is raised.

In itself it is not new in gate valves, a deformation occurring under the influence of compressive forces an elastic, compressible sealing body, e.g. B. made of rubber for sealing purposes. For example, it has already been proposed that the slide closure piece itself be made of the compressible Build up material and thereby the play between the guide surfaces of the slide closure piece and the valve body to be dimensioned so that the valve gate practically smoothly the open to the closed position and vice versa is movable. After transferring the with his rear End of the slide closure piece connected to a spindle in the final position experiences this under the influence of the actuating pressure, a compression which extends beyond the through opening to be blocked. The slide closure piece executed in soft rubber hardness can have a pot shape and with its inner wall rest loosely and directly on a tubular reinforcing insert, which with his rear end rigid with a spindle which transmits the actuating pressure to the closure piece is connected and its front end is set back by the amount of the upsetting stroke relative to the bottom of the pot is.

In known gate valves of this type, the full pressure of the acts at the beginning of the opening movement Flow medium so long on the closure piece until the sealing surfaces are pulled from each other. The locking piece is therefore subject to a correspondingly high level of wear and tear. on the other hand Relatively large opening and closing forces are sometimes required.

.Other known slide closure pieces are circular in cross section and exist in Gate valve with ring seal

and printing device

for the ring seal

Applicant:

Pörringer & Schindler GmbH,
Zweibrücken (Palatinate)

Artur Baston and Richard Schott, Zweibrücken (Palatinate), have been named as inventors

essentially of a metallic core, an elastic ring jacket pushed onto it Material or ring jacket segments as well as in the area of the flow tubes adjoining the valve body from a metallic cover of the elastic jacket or metallic segments that form the elastic Complete segments to form a full ring. Another embodiment looks a nearly square one Slide closure piece in front of which both sides facing the pipe connections of the slide valve housing are provided with an elastic sealing ring. In these known arrangements, when closing the Slide on the elastic parts acting as a seal interacting from above and below Pressure applied in a vertical direction. Now, as in the last-mentioned embodiment, the elastic seal ^ without play during the up and down movement of the slide lock piece in the slide valve housing, this creates considerable friction between the elastic sealing parts and the spindle housing, which lead to early wear. In addition, the elastic seal is sure to enter the pipe openings here a. This deformation also contributes to the early wear. This is the case with the previously mentioned Embodiments with metallic covers prevented. However, there are also the elastic ones Sealing parts at least partially on the valve housing during the opening and closing movements are quickly worn out by the frictional forces. After all, the is a purely vertical transmission The pressure forces exerted by the spindle cannot be considered a good solution, as the sealing parts are not uniform compressed and thereby pressed on their circumference to different degrees on the housing sealing surfaces will.

009 588/231

According to the invention, the disadvantages and difficulties identified are "'eliminated by the fact that when using sealing rings made of elastic material, for example soft rubber, the slide plate on each side has an outer diameter that corresponds approximately to the borrowed width of the pipe connection pieces of the housing, each with a seat Has sealing ring, the width of which in the unloaded state expediently coincides with the length of the connecting piece. A clamp which can be influenced by the spindle, for example via a nut and encompasses each sealing ring over the entire circumference, is arranged as a pressure device whose free end faces are pressed against the sealing surfaces on the valve body. The pressure is therefore exerted on the sealing rings over the entire circumference and not just at one point on the circumference. In addition, the sealing rings can be moved without friction on the associated valve body surfaces sealing contact when the slide plate has practically already reached its closed position.

If the slider is opened, lifted so the pressure exerted by the clamp on the compression-enabled seals, the seals go to their original <* 5 form back, in which they compared to the metal parts have so much game that they rub at any point on metal .

The clamp can be constructed in several parts and, for. B. consist of two or more pressure pieces. The clamp can preferably consist of two lower pressure pieces connected to one another by a hinge and an upper pressure piece that can be influenced by the spindle nut. The latter is then with the lower pressure pieces z. B. movably coupled by means of bolts or the like. The lower Pressure pieces can also have a shoulder on the outer circumference, which in the closed position on each a support surface that is appropriately arranged on the valve housing and serves to limit the stroke. The latter can be arranged at an angle to the spindle axis.

The coupling between the upper pressure piece and the lower pressure pieces is such that the upper The pressure piece is brought closer to the lower pressure pieces by the corresponding movements of the actuating spindle or can be removed from them. Through the movement of the upper pressure piece and through the contact surfaces In the housing, the clamp closes like pliers and compresses the elastic sealing rings between them and the nozzle on the slide plate, so that the free end faces of the sealing rings in the direction Bulge out on the housing sealing surfaces and press against them to form a seal. When the upsetting effect is canceled If the elastic ring material enters the loosely absorbing material, it is formed by the metal parts, as it were Recess all the way back.

The particular advantage of the gate valve according to the invention is to be seen in the fact that during the Stroke movement when opening and closing the elastic sealing rings remain untensioned and, due to the exact guidance of the slide plate in the housing, a contact between the sealing ring and the housing sealing surface the slide plate movement is always avoided with certainty. Only after reaching the closed position, in which the lower pressure pieces are placed on the bearing surfaces in the housing, are moved by moving on z. B. of the upper pressure piece compresses the elastic sealing rings and thus seals against the corresponding surfaces of the housing (pipe connection piece) pressed on. When opening is due to the movement of the actuating spindle in the embodiment mentioned the upper pressure piece is removed from the two lower ones and this results in the upsetting effect the sealing rings lifted, whereby the same stand out from the sealing surfaces in the housing. When moving on of the upper pressure piece, this takes the lower pressure pieces with it via the two bolts. There no contact between the elastic sealing rings and during the closing or opening movement the housing wall can take place, there is also no wear and tear on the same. Due to the low The only friction is the slide plate in the corresponding guide slots in the housing Actuating forces when closing and opening are comparatively very low. Finally, as before mentioned, the sealing pressure is not only exerted in one, preferably the vertical, spindle direction, but evenly radial in each direction.

Tn the drawing is a schematic embodiment of a gate valve according to the invention illustrated, apart from the representation of the complete, known housing of the gate valve is. The housing is only indicated insofar as it is necessary to understand the invention.

Fig. 1 shows the gate valve in longitudinal section,

FIG. 2 shows the same in cross section along the line H-II of FIG. 1 with slide and pressure parts in a view.

The housing 1 has two transversely to the pipe axis Guide slots 2 in which the slide plate 3 is guided. The slide plate 3 is annular on both sides Nozzle 4 on which the sealing rings 5 made of elastic, compressible material sit. To on the outside, the sealing rings S are enclosed by the two lower pressure pieces 6 and the upper pressure piece 7. The two lower pressure pieces 6 are connected to one another by a joint 8 and hang by bolts 9 together with the pressure piece 7. The lower pressure pieces 6 also each have an approach 10, the rests on the bearing surfaces 11 arranged at an angle in the housing in the closed position. The top Pressure piece 7 is connected to actuating spindle 13 by spindle nut 12.

Claims (5)

Patent claims: 1. Gate valve with one or more, preferably two, arranged in the valve plate, in the closed position by a pressure device on the jGehäusesitze pressable sealing rings, characterized in that when used from sealing rings. elastic material the "slide plate (3) on each side one in its ■ Nem outer diameter approximately the clear width of the pipe connection piece of the housing (1) has corresponding nozzle (4) with a seated sealing ring (S) , the width of which in the unloaded state expediently coincides with the nozzle length (4), and that as a pressure device one of the spindle (13) z. B. via a nut (12) influenceable, each sealing ring is arranged on the entire circumference comprehensive clamp, through which the sealing rings are compressed radially in the closed position so that their free end faces are pressed against the sealing surfaces on the valve housing (1). · 2. Gate valve according to claim 1, characterized in that - that the clamp is constructed in several parts is. _: 3. Gate valve according to claim 1 and 2, characterized marked that the clamp consists of two by a joint (8) interconnected lower pressure pieces (6) and an upper, of the spindle nut (12) controllable pressure piece (7) is made with the lower pressure pieces (6) e.g. B. by means of bolts (9) od. The like. Is movably coupled. 4. Gate valve according to claim 1 to 3, characterized in that the lower pressure pieces (6) each have a shoulder (10) on the outer circumference which, in the closed position, is attached to one on the slide housing (1) correspondingly arranged, the stroke limitation serving support surface (11) sits. 5. Gate valve according to claim 3 and 4, characterized in that the bearing surfaces (11) are arranged obliquely to the spindle axis. Considered publications:
French Patent Nos. 976 577, 760 334; U.S. Patents Nos. 2,734,714, 2,552,991,
385 463.2 229 871. 1 sheet of drawings © 009 588/231 8.60