DE3146270C2 - Gate valve - Google Patents

Abstract

In the case of a gate valve for opening and closing connection openings (2, 3) between two spaces (2a, 3a), consisting of a) a valve housing (1) with two connection openings (2, 3), b) a closing body (4) with laterally at least against one of the connecting openings (2, 3) expandable shut-off surfaces (5, 6), c) an actuating device (10) with a push rod (11) for moving the closing body (4) into and out of the closed position (23) and for expanding the shut-off surface (s) (5, 6) against the connecting opening (s) (2, 3) and d) an end stop (16) for the closing body (4) in the desired closed position, a simple design with undiminished high tightness and operating speed achieves that e) the closing body (4) and the shut-off surface (s) (5, 6) form a fluid-filled hollow body (7) and f) on the hollow body (7) for pressurization a with the actuating device (10) in operative connection s standing displacement ram (8) is arranged.

Description

An actuating device 10 with a push rod 11 is with the displacement ram 8 in pressure and

35 tensile active connection, in that the latter is the end piece

represents the push rod itself The actuating device 10 is fluid-operated and has a working cycle

The invention relates to a gate valve according to cylinder 12 with inlet and outlet for fluid 13 and 14.

the preamble of claim 1. Such a threaded connector 15 is a sealed one

Gate valve is z. B. from US Patent 40 connection to the valve housing 1, the thrust

28 25 528 known, the push rod with a rod 11, e.g. within the threaded connector fluid-

Handwheel and a thread is operated, and is guided tightly

the hollow body by means of a form-fitting connection An adjustable end stop 16 - z. Legs dung from the displacement piston into and out of the screw - in an inspection flap 17 opposite Closed position is shifted. The connection between 45 of the actuating device 10 acts on a z. B. see the actuating device and the hollow body screw-shaped closure 18 in the closing body 4 is therefore elaborately designed and would with one with opposite the actuator 10 for the Aufdem Handwheel, however, does not allow sudden filling or draining of the fluid in the hollow body 7. Da quick actuation of the gate valve to a high through the displacement path of the closing body 4 is mechanical Load in the area of the interlocking 50 and in the correct or desired end position lead connection. of the closing body 4 causes a further pressure on the For quick actuation of gate valves, push rod 11 is a deeper penetration of the displacement fluid-operated, sealing plunger 8 into the hollow body 7 with the valve housing and causes a bound actuating devices known (DE-AS expansion of the shut-off plates 5,6 against the sealing surface-1058 802). 55 Chen 19, 20 on the edge of the connection on the hollow body

It is therefore the object of the invention to provide a fast training openings 2.3.

to create actuated gate valve, in which elastic diaphragms 21,22 are each on the closing

the connection between the actuator body 4 and the shut-off plates 5, 6 is gas-tight

and the hollow body is simply built up, ζ. B. vulcanized, and allow through

This task is due to the characteristics after the 60 their elasticity the spreading movement for pressing the

Characteristics of the claim solved shut-off plates 5.6 against the sealing surfaces 19.20 in the

The gate valve according to the invention has the closed position 23.

The advantage of a mechanically extremely simple ball bearing 24 on the closing body 4 together form

Structure, great functional reliability and faster with recesses 25 in the valve housing 1 a guide

Operability 65 of the closing body 4, for the

The gate valve is only opened by sliding it into the open position 26 (shown in dashed lines)

alone by the actuation device itself, without auxiliary equipment),

taking of the springs supporting the opening and in Figs. la and b correspond to the positions:

- the open position 26 of the closing body 4;

B- the closure position 23 of the closure element 4;

C— the maximum displacement position of the displacement ram 8 in the closing body 4, that is to say the one in La in the expanded state shown in dashed lines, in which the shut-off plates 5, 6 evenly pressed against the sealing surfaces 19, 20 and sealed in the locking position 23).

It is possible to determine the degree of exposure to the Displacement stamp on the hollow body caused expansion of the shut-off plates against the Limit connection openings by placing the displacement ram in the desired maximum position comes into contact with a stop and is thereby prevented from further displacement; this measure is important insofar as, on the one hand, the shut-off plates 5, 6 should only rest against the sealing surfaces (seals) 19, 20 and not on the edge of the connection opening 2, 3 and, on the other hand, at extremely strong expansion of the shut-off plates 5, 6 caused by the mostly elastic seals 19, 20 caused back pressure can increase so far that the fluid in the hollow body 7 to the necessarily existing sealing points begins to leak As a stop for the displacement die can e.g. B. serve the screw plug 18; it can thus be used as an adjustable stop for the displacement ram 8 at the same time.

The function of the gate valve also results in a general way from the foregoing, w ^ at in summary it is important that - in the open position of the gate valve the Fluid in the hollow body is under approximately the same pressure or a lower pressure than his External pressure, so that the Abspenplatten are in a non-expanded position, so as possible close to the center of the hollow body, this position being provided by a suitable clamping device acting on the shut-off plates Hollow body can be ensured. The closing body is moved into the closed position by advancing the with the displacement ram in operative connection and driven in any way Push rod; in the closed position, the closing body has to be secured by an end stop on a Be prevented from further postponement.

A further advance of the push rod now causes the fluid in the hollow body to be displaced in the area in which the displacement ram acts; the resulting internal pressure in the hollow body is now sufficient, the To overcome the forces of tensile stress or equivalent means as well as the external pressure, so that - following the displacement - the shut-off plates of the hollow body are displaced outwards, & h. are spread in the direction of and against the connection openings. In the maximum displacement position of the displacement ram, the highest level of tightness of the gate valve is achieved. The tightness also remains even then - albeit to a lesser extent - received when the pressure on the push rod is off subsides for any reason; this means an increase in system security

As soon as the push rod is withdrawn to open the gate valve, the displacement ram is relieved and also withdrawn, so that - following the resulting reduction in the internal pressure in the hollow body - move the shut-off plates away from the connection openings. With further withdrawal of the The push rod and the displacement temple coupled to it, the hollow body follows the movement of the push rod, so that it is moved into the open position.

If, in the event that the actuating device fails, it is desired that the open position is assumed automatically, the closing body can be automatically moved into the opening position by a spring or the like let the opening position retract. Conversely, you will either use a compression spring or the like the side of the actuating device or a tension spring or the like on the opposite side let act on the hollow body if the locking position is to be assumed or remain in the event of failure of the actuating device.

Furthermore, a compression or tension spring can act on the displacement ram in such a way that in the event of failure the actuating device, the degree of displacement in the hollow body is reduced, so that the shut-off surfaces move away from the connecting openings and thus an automatic opening of the gate valve can take place.

1 sheet of drawings

Claims (1)

the end of the push rod allows the like Claim: serves as the seal through the hollow body wall fende displacement die, which is not positively connected to the hollow body, since the latter is Gate valve for opening and closing 5 lines follows every movement of the push rod; these connection openings (2,3) simplification between two spaces results from the fact that the fluid in the hollow body (2a, 3a), consisting of is enclosed by sealed This arrangement is a) a slide valve housing (1) with two connec- tions not only extremely simple, it allows opening openings (2,3), also a very high operating speed of the b) a closing body (4) with a side, at least one gate valve, and it avoids sudden impacts at least against one of the connection openings (2, between the actuating device and the hollow body 3), expandable and with this one fluid filler. th hollow body (J) forming shut-off plate (s). An embodiment of the invention is based on the (5,6), drawing described. c) an actuating device (8, 10, 11) with 15 in the drawing a push rod (11) for moving the Fig. la a gate valve in partial section transverse to Schücßkörpers (4) in and out of the closing direction of the connection openings as well ■ position (23) and for spreading the shut-off Fig. Ib the gate valve according to Fig. La in the plate (s) (5, 6) against the connection opening g (en) (2,3), 20 In Fig. la / b, a slide valve housing 1 has a connector d) an end stop (16) for the closing body opening openings 2,3 between the not shown here (4) in the desired closed position and provided spaces 2a and 3a. A closing body 4 e) one for pressurization with the forms together with opposite this sliding push rod (11) of the actuating device and sealingly connected shut-off plates 5, 6 The wall of the 25 is a hollow body 7, which is connected in a tensile and compression-proof manner. A hollow body is attached to the hollow body 7 (7) sealed penetrating stamp 8 arranged, which the wall of the Displacement ram (8), closing body 4 penetrates laterally in a sealed manner; For this characterized by a guide flange 9 is used on the closing body 4. It loads 0 a fluid-operated, with the slide but no stops or drivers between housing (1) tightly connected actuating device 30 the displacement ram and the hollow body, see above device (8, 10, 11), which with the hollow body (7) that the latter exclusively due to fluidic excess is not frictionally connected or the lower part is moved.