FR2490773A1 - STOP DEVICE - Google Patents

Abstract

A. STOPPING DEVICE. B. SHUT-OFF DEVICE CHARACTERIZED IN THAT BETWEEN THE SPRING 6 AND THE SEALING PACKING 12 IS PROVIDED A BACKING PLATE 14 WITH A CENTRAL PASSAGE ORIFICE FOR THE VALVE AXLE 4, WHILE THE MOUNTING STRUCTURE 7 INCLUDES IN FRONT OF THE FRONT FACE, OPPOSED TO THE SEALING SEAL 12, OF THE BACKING PLATE 14, LIMIT STOPS FOR THE BACKING PLATE 14. C. THE INVENTION APPLIES TO THE EQUIPMENT PRESSURIZED FLUID PIPES.

Description

The invention relates to a stop device with a

  valve shaft, bearing on its internal side the boot

  closure and which, on its external side to the shoemaker, is

  spring-loaded, the end of which compresses a filling of

  sealing for the valve shaft against the internal pressure of the casing, valve having a mounting structure, supporting

  the operating assembly of the stop device.

  A major advantage of the stop devices with spring-loaded seals for

  valve axis, lies in the automatic adaptation of the

  chéité. In addition, construction expenditure is reduced, over-

  all when, in the case of a lift valve, the valve spring for the closure member compresses the seal at the same time, only one spring being necessary

for these two functions.

  As in this case, the compressive force acts

  on the seal is determined by the valve spring, but for the purpose of achieving this, the allowable or necessary force for actuating the valve

  is preponderant, it can happen under unfavorable circumstances.

  rings, for example during water hammers, or when the valve is subjected to a very high test pressure :, that the seal is expelled by the pressure of the bore of the gland against the action valve spring

  and that a leakage occurs at this location.

  This also occurs during a rupture of the spring.

  The object of the invention is to create a stopping device of the type mentioned above, in which, even in the event of a rupture of the spring or of an internal load by a high pressure, no leakage fault appears.

on the seal.

  For this purpose, the invention relates to a stop device characterized in that, between the spring and the seal, is disposed a support plate with a central passage hole for the valve shaft, while the structure

  In front of the front face, the mounting plate

  the sealing plate of the support plate, the end stops of

run for the support plate.

  G-rAce the provisions defined above, it is held that in the special cases, e cx ': ultien of ul r - 2.- sealing out of its housing is pocketed by the mounting structure, and by the intermediate of the bearing washer, so that, as has been confirmed, leakage on the packing

sealing are avoided.

  The use of a washer as a backing plate offers the advantage that the backing plate can be used for a colourant and inexpensive piece of commerce, for example a

  Belleville washer. In addition, and unlike

  In the form of a strip, no locking in rotation is necessary to allow even in the case of a stirrup-shaped mounting structure, to permanently ensure

support plate.

  Providing that, between the backing plate and the packer, a compression bushing is provided

  having a centering collar engaged within the opening

  fice of passing the support plate, while between the plate

  support and end stops shall be provided when the

  seems to be mounted, an axial clearance corresponding at least to the

  the centering collar, the compression sleeve of the

  sealing ring also serves as centering for the circular support plate, and yet a lateral introduction of this support plate into its mounting position remains possible

no problem.

  The invention will be explained in more detail with reference to an embodiment of a stop device

  according to the invention, in the form of a lift valve

  is lying. This embodiment is shown in the accompanying drawings, in which: - Figure 1 is a longitudinal section of the valve according to the invention, - Figure 2 is a top view of the valve according to Figure 1, FIG. 3 is a side view of the valve

according to Figure 1.

  With the valve seat 1 in a valve housing 2, cooperates a closure member 3. The valve shaft 4 protrudes through a cover 5 out of the housing 1 of the

  and on the outside of it he is surrounded by a res-

  6. A caliper 7 in the form of a U is connected to its 0 $ Overtracities to a fire-resistant enclosure.

  piece, this cover acting as a mounting structure for the whole

  operating pressure of the valve. This assembly comprises a pivoting lever 8 with a fork-shaped end which acts

  by means of driving pins 9 and a cover

  10 on the valve spring 6 and the valve shaft 4, to adjust the stroke. Thanks to a plug-in pin 11 capable of being introduced laterally into the stirrup 7, the pivoting lever 8 and with it the closing member 3 can, if necessary, be locked in the closed position.

or opening.

  In the cover 5 the valve shaft 4 is surrounded by

  and a multi-layer seal 12. Through a compression sleeve 13 and a support plate 14 consisting of a Belleville washer, and which has a central passage opening for the valve shaft 4, the valve spring 6 acts on the seal 12

by compressing it.

  During assembly, the seal 12 is first placed in the cover 5 and in the measurement

  o this is necessary, it is precompressed. Then,

  kills the establishment of the compression sleeve 13. Between the front face of the compression sleeve 13 and the end stops 15 which are provided on the inner side of the stirrup 17 in front of the end face, opposite the compression sleeve 13, of the support plate 14, remains a distance in height corresponding at least to the total height of the support plate 14, so that it can be introduced laterally between the end stops 15 and the compression sleeve 13 and be threaded on the centering flange 16 on this compression sleeve 13. Then, the valve spring 6 provided with the drive cap 10 is placed in the caliper 7. see you

  than to then mount the valve shaft 4 and the pivoting lever 8.

  If there is pressure in the valve housing 2 of a level such that the seal 12 is strongly compressed against the action of the valve spring 6 or that the valve spring 6 breaks, the pressure plate 6 The support 14 is then applied against the end stops 15 and prevents the compression bushing 13 in its entirety and only a part of the seal 12, itself and expelled from the cover 5 and that one ' uite, nisse ornament 4.-

R E V E N DICAT I 0 N S

  1.- Stop device with a valve shaft, porting on its inner side to the box the closure member and on its outer side the casing is surrounded by a spring, the end compresses a seal sealing for the axis

  valve against the internal pressure of the casing,

  carrying a farm structure supporting the whole of

  stop device, valve characterized in that,

  between the spring (6) and the seal (12) is

  a bearing plate (14) with a central passage hole for the valve shaft (4), while the mounting structure (7) has in front of the end face opposite to the seal (12) , of the support plate (14), end stops

  stroke (15) for the support plate (14).

  2. Stop device according to claim 1,

  characterized in that the support plate (14) is a washer.

  3. Stop device according to claim 2,

  characterized in that between the bearing plate (14) and the packing

  seal (12) is provided with a compression sleeve (13) having a centering collar (16) engaged therein

  the through hole of the support plate (14), while

  be the support plate (14) and the end stops (15),

  when the assembly is mounted, an axial clearance corresponding to

  laying at least at the height of the centering collar (16).