DE1650390A1 - Stopcock with rotating locking link - Google Patents

Description

179 Avenue de la Division Leclerc EHGHIEF (VaI d'Oise) / France

Our sign; G- 1 117

Stopcock with rotating locking link

The subject of the invention is a tap with

a rotatable locking member, which in particular. By a a ball containing a central channel is formed.

The invention particularly relates to

Embodiment of a faucet with a rotatable Verschlüssglied which zwisohen simultaneously at a very low temperature, in the order of -250 ⁰ C or at a verhälthismässig high temperature in the order of 400 ⁰ C with peaks of up to 600 ⁰ C or operates these two temperature limit values satisfying .

009842/0412

Such a faucet offers especially important advantages in industries which, for example, heat transfer fluids at high temperature or, conversely, to separate materials at very low temperatures (cryogenic materials).

It is known that a cock (or eiiES valve) is sealed on the actuation axis of the closure member through a stuffing box. This is generally achieved by a screw-on ring or one on the body of the faucet attached ring-shaped splash formed, which an insert compresses, which is located in the body of the tap and surrounds the actuation axis. The deposit is made whole Manufactured in various materials, the most common of which are in the form of cords, braids or asbestos Flakes and polytetrafluoroethylene resin in the form of cords, braids, perforated disks or sealing rings are.

Usually this sealing system works

satisfactory. Asbestos and especially polytetrafluoroethylene, which are used separately or mixed are chemically resistant to most acids, bases and solvents resilient. Furthermore, the actuation axis in contact with these sealing materials is conveniently lubricated either by the polytetrafluoroethylene itself, or by adding graphite or other lubricants.

However, the operation of the tap is after

Provided that there is a significant increase or decrease in temperatures' more and more difficult. It can even happen that aa is the actuation axis stuck.

These difficulties can lead to disaster

009842/04 12 baths

Expansions or contractions of the actuating axis and the valve body result when the metals are used in manufacture were not chosen appropriately.

An expedient choice of these metals enables these difficulties to be overcome,

However, the difficulties in the operation stir most of the behavior of the deposits of the gland ago "The deposits of asbestos exert increased in accordance with the increase in temperature pressure on the operating axis of · Likewise, the expansion or contraction of the similar deposits of polytetrafluorethylene larger than the of metals. In the warmth, these inserts cannot develop in their receiving space and also press on the actuation axis. In the cold, these inserts, if they are in the form of perforated disks, exert an abnormal pressure because they contract faster than the metal of the actuation axis.

The invention aims to overcome these drawbacks

remedy and the use of the tap without the risk of plague eating to enable its actuation axis, esp. for Temperatures of the fluid, which values are of the order of magnitude between + 400 ° C and -250 ° C.

The tap according to the invention with a body,

in which a rotatable locking member and a rotatable actuator axis are arranged for this closure member, the actuation axis being interposed by the body a sealing device occurs, is characterized in that the actuator is inserted through the valve body an opening forming a seat occurs and a thickening has, which is a standing with dienern seat in contact

0098 * 2 / OU 2 ^8AD ORIGINAL

Contact surface with a circular cross-section "has, with one Clamping device is provided, which the contact surface of the, Holds actuation axis on the seat.

The thickening of the actuation axis is preferred Covered with a self-lubricating sealant, e.g. polytetrafluoroethylene or polytrifluoroethylene. "

According to an advantageous embodiment, the thickening of the actuation axis has a second contact surface, which is beyond the first in relation to the body, and the I-clamping device includes one attached to the body annular flange, which is supported on this second contact surface, the two contact surfaces with a very are covered with a thin layer of self-lubricating sealant.

The first contact surface can be conical or

be spherical. The conical shape is preferred as it guides the actuation axis in one relative to the axis of the body perpendicular direction causes.

The other contact surface of the thickening is

preferably spherical. In this training, the ring-shaped Clamping flange can be placed comfortably and without special precautionary measures on this contact surface, without in any ¥ to influence the guidance of the actuation axis.

The combination of these two features is

for ;; good tightness and easy actuation of the locking member extremely cheap.

The invention is explained below by way of example with reference to the drawing.

Fig. 1 is a partially axially sectioned one

0 09842 / OA 1.2 bad original

View of the rooster.

Pig. 2 shows in a schematic perspective view the actuation axis of the tap alone.

3 is a view taken along line IH-III of FIG Pig. 1 sectional view.

Pig. 4 is a partial vertical section the conical contact surface of the actuation axis in a special embodiment for plaguing leaks.

In Pig. 1 illustrated embodiment

of the invention is the actuation axis 1 for a cock 2 with | a rotatable closure member is determined, which is formed by a cut ball 5.

! Axis 1 expediently consists of one

single piece and is so thickened on part of its length, that a spherical contact surface 13 and a conical contact surface 15 arise on this thickened section. the spherical contact surface 13 is formed by a cylindrical section 12 extended, which into a threaded Flattening 11 runs out. The conical contact surface ends in a prismatic extension 16. Between the spherical Contact surface 13 and the conical contact surface 15 carries the Actuating axis a flat 14, the two legs 17 of which have a pair of grooves 32 laterally and on each side, which are at the same distance from the Aense A-A of the actuation axis 1.

The actuation hole .1 is made of a metal lierstellf deseen coefficient of expansion that of the deii-JCörpor 21 deD Hahns 2 forming metals very close. This metal Xwt preferably stainless steel, bad ORIGINAL

00984270412

6 5Ü39Ü

The actuation axis 1 is also with a

thin layer of polytetrafluoroethylene coated on which the contact surfaces 13 and 15 with a very small thickness in of the order of magnitude of, for example, 2/100 to 1/10 mm and preferably of 5/100 mm is applied. When using Polyte, fluoroethylene met this can be done e.g. by spraying on using an electrostatic Spray gun are applied. This layer is subjected to a heat treatment. However, it can also be a other works that can withstand high pressures and temperatures

φ substance can be used, e.g. polytrifluoroethylene.

The body 21 of the cock 2 is annular

and is closed by two flat surfaces 18, which are secured by tension screws 33 between connecting pieces 23 associated flanges 22 are clamped. With the described Execution, the lag screws 33 do not pass through the body 21, which is only used for its centering on certain supported by them.

The body 21 has an inner chamber 26,

^ in which the one diametrical channel 2? containing ball 3 is housed. The ball 3 is floating through two metallic ones Seals 28 made of stainless steel clamped, which preferably have a special shell-shaped profile with sealing edge strips and can work under large temperature differences. This installation corresponds to that of the German Patent application G 50.548 XIl / 47g dated July 4, 1967.

According to the invention, the body 21 carries one side the conical seat 19 »which mills the chamber 26 and which receives the conical contact surface 15 of the actuating axis 1. Four partly threaded pins 6 are inserted into the base plate 34 of the

009842/04 12

Body 21 screwed in and together with nuts 7 cause the fastening of an annular clamping flange 4 »which a spherical one that fits onto the contact surface 13 of the axis 1 Has shell 5.

The chamber 26 is sealed against the actuation axis 1 by tightening the flange 4 by the nuts 7 on the spherical contact surface 13, whereby the conical contact surface 15 is pressed against its seat 19. This seal is enhanced by the low to the tapered contact surface 15 applied plastic layer, at the same time improved Λ the rotation of the actuation axis.

Adjustment of the angular position of the channel

27 of the ball 3 with respect to the axis A-A of the body 21 takes place by means of a handle 8 which is attached to the actuation axis 1 is attached, the other end rotatably with the ball 3 is connected by the projection 16 engaging in the hat 31 of the ball 3.

The closing or full opening of the ball 3 corresponding limit positions of the actuation B _e are determined by the flattened portion 14 whose Sehenkel strike 17 in these positions by two diametrically opposed grooves 32 on the pins. 6

In Pig «3 one of the limit positions of the flat 14 is shown in full extension, which z. B. the the opening of the tap, and the other one with a dash-dotted line the border division corresponding to the closure, in which the Flattening 14 has come to 14a after a 90 ° rotation.

Purely the good execution of these movements the hats 32 and the pins 6 are equidistant from the axis A-A arranged.

009842/0412 "^ original

- 8 - 16bÜ39Ü

The cock 2 designed in this way has the remarkable property that it does not consist of a solid part has a material other than metal, as the only one for sealing used plastic in a very thin layer the axis 1 and, if necessary, on the spherical contact surface of the Seal 28 is applied.

In addition, since the axis 1 and the body 21

expediently either from the same metal or from metals are produced with comparable expansion coefficients, considerable expansion changes can occur under the effect of also significant temperature fluctuations (in one sense or the other) occur without the sealing of the passage to affect the actuation axis 1 by the body 21. Further, the resistance to the operation of the ball 3 becomes not significantly changed by temperature fluctuations, and there is no plague eating to fear. One executed in this way Hahn was able to relax both at around -250 ° 0 liquid nitrogen as well as at + 400 ° C with peaks of up to 600 ° C.

It should also be noted that the spherical contact surface 13 and the likewise spherical shell 5 of the Flanges 4 enable even strong centering of the contact surface 15 on the seat 19 without the need for a more precise Parallelism between the flange 4 and the base plate 34 is required.

The embodiment of Fig. 4 relates to a special training for the detection of leaks, which by the Invention; eiaäsßen construction of the actuating axis 1 is possible. The conical surface 15 of the actuation axis 1 is in

0 0 9 8 4 2/0 U 1 2 * ^{AD 0RiGiNAL}

a small hat 9 on its middle section. The hat 9 is opposite to a channel 29, "which is formed in the body 21 is and flows into the open. Under these conditions, this may be between the contact surface 15 and its seat 19 Any fluids that pass through are caught by the! Tut 9 and then discharged through channel 29 «With a light monitoring, leaks of the actuating axis can be quickly detected, which can easily be eliminated.

The invention can of course be modified. In particular, »numerous changes to the training f of the rotatable closure member, which can optionally be designed as a cock plug.

8A0

Claims (7)

Claims 1 ·) faucet with a body with a rotatable Closure member and a rotatable actuating axis for this Closure member which passes through the body with the interposition of a sealing device, characterized in that the operating axis (1) through the body (21) of the tap in an opening (19) forming a seat occurs and a thickening has which one with this seat (19) in contact standingb has contact surface (15) with a circular cross-section, wherein a clamping device holds the contact surface (15) of the actuator axis (1) on the other seat (19). 2.) Shark according to claim 1, characterized in that that the thickening of the actuation axis is coated with a self-lubricating sealant, e.g. polytetrafluoroethylene or polytrifluoroethylene. 3.) Hahn. after. Claim 1, characterized in that the thickening of the actuating axis (1) is a second with respect to the body (21) on the other side of the first contact surface (15) lying contact surface (13), and that the clamping device an annular puddle attached to the body (21) and supported on this second contact surface (13) (4) has .. 4 ·) Tap according to claim 1, characterized in that the seat formed in the body (21) (19) supporting contact surface (15) of the thickening has a conical surface. 5.) Faucet according to claim 1, daduroh characterized, daa, a - the. _; aich on the clamping flange (4) supporting 009842/0 412 ORIGINAL BATHROOM surface (13) of the thickening has a spherical surface. 6.) Tap according to claim 1, characterized in that that the two contact surfaces (13 »15) are separated by a flattened part (14) which is between the body (21) and the annular clamping flange (4) is freely rotatable and its angular stroke is limited by stops (6). 7.) Tap according to claim 6, characterized in that the stops (6) of the flattened part (14) through pins screwed into the body (21) of the tap are formed, which the annular clamping flange (4) on the spherical Hold the contact surface (13), 8 ·) Tap according to claim 1, characterized in that the seat formed in the body (21) (t9) supporting contact surface (15) of the thickening an annular groove connected to the outer space for the purpose of locating Having licking. BAD ORIGINAL 0 0 9 B 4 2 / IH 1 2 . ■■■ '* Le e rs e ι te