DE581479C - Gate valves with parallel sealing plates, which are permanently pressed onto their seats by a spring arranged eccentrically to the plate center and which are under additional pressure in the closed position - Google Patents

Description

There are already gate valves with parallel sealing plates known that are permanent are pressed onto their seats by a spring arranged eccentrically to the center of the plate and in the closed position - under an additional pressure achieved by the wedge effect stand. With these shut-off devices, those at the beginning of the downward movement are only below Sealing plates standing under spring pressure even before they have reached the lower end position are pressed apart. During the last part of the downward movement, the sealing surfaces slide under high pressure on each other; they are therefore subject to heavy wear, so that a permanent safe working with such a slide cannot be achieved.

These deficiencies are eliminated according to the invention in that to generate the additional Closing pressure toggle lever are provided, which in the final position almost up are spread in the extended position and with their one end in on the plate carrier body or guides arranged on the spindle slide, so that when the slide is opened a Pulling the panels off their seats is avoided.

The subject of the invention is shown in Fig. 1, 2, 3 and 4 -shown in section. Fig. 1 and 3 show the slide in the closed position, Fig. 2 in the open position, · Fig. 4 shows a slide in the open position, its toggle lever are designed in a special way.

In these figures, 1 denotes the housing, 2 the spindle, 3 toggle levers, 4 sealing plates, 5 sealing surfaces, 6 a plate carrier body, 7 guide rollers, 8 guide strips, 9 slots, 10 a spring.

In the closed position, the toggle levers linked to the spindle 2 press the sealing plates 4 firmly against the sealing surfaces 5. The housing can therefore be depressurized and the stuffing box packed will. When the slide is opened, the toggle levers 3 are withdrawn; the However, sealing plates 4 remain loaded by the pressure of the spring 10. This is below the horizontal sealing plate axis, but on its vertical axis and loads the sealing plates 4 eccentrically. If you continue to raise the spindle 2 the toggle levers 3 are guided in the slots 9 of the body 6 towards the middle and the Body 6 lifted with the sealing plates stored in it. Here the slide Sealing plates 4 under spring pressure on the sealing surfaces 5. Are in the open position the sealing surfaces are unprotected and can get dirty. Since the spring 10 on the lower If the edge of the sealing plates exerts the greatest pressure, the contamination is now reliable when the valve is closed stripped from the sealing surfaces 5. To prevent the sealing plates 4 are loaded prematurely when the slide is closed by the toggle lever 3 Guide strips 8 are provided against which the at the ends of the toggle lever or the guide rollers arranged on the spindle.

In Fig. 4 the toggle levers 3 are at one end on the sealing plates rotatably hinged, while the other end is guided in a cutout of the spindle. These guided ends are designed accordingly and press when pressing the Sealing plates on the seats on top of one another and in this way enable pressure equalization the seat pressures.

Claims (1)

Claim: Gate valve with parallel sealing plates, which are continuously eccentric to the plate center arranged spring are pressed on their seats and in the closed position under an additional Stand pressure, characterized in that to generate the additional. Closing pressure toggle lever (3) provided are, which are spread in the final position almost to the extended position and slide with their one end in guides arranged on the plate support body (6) or on the spindle (2), so that when the slide is opened, the plates (4) are prevented from being pulled off their seats will. For this purpose ι sheet of drawings