LU86714A1 - MEMBRANE TAP - Google Patents

Description

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; ; »Λ j | "J GRA \ D-ORCHÉ BY IVXSMBOUIG

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Mr. Minister:. ’U 16 oecenore 1 ^ 86 of Economy and Medium Keys r„, „EftöSq Intellectual Property Service

nireJi! llVre 1 * Sjß LUXEMBOURG

y y g 7 '""' · Application for an Invention Patent γ. AS "A." I. Request

The so-called company: CBODEUX S. A., 24 rue de Diekirch, 7505 (2)

Lintgen, represented by MM. Freylinger Ernest & Meyers "Ernest, ing. ConsT en propr. Ind. ', 46 rue“ du Cimetière ", .......... Luxëî ^ ôüf g,'“ ”'~ {a ~ acting in quality of agents________________________ ______________ deposefntjffi S§ÂZ ^. December nineteen hundred and eighty six_ ^ À) at hours, at the Ministry of the Economy and the Middle Classes, in Luxembourg: 1. this request for obtaining a patent for invention concerning: ..... ..Faucet with ..... membrane .__________________________________________________........__ i 5) 2. the description in language „French ____________________________. of the invention in triplicate; 3. _________________________________ drawing boards, in triplicate; 4. the receipt of the fees paid to the Luxembourg Registration Office, on 16 12 1986 5. the delegation of power, dated .. Lintgen .................. ............................. the . 10-12-1986: __________: 6. the successor document (authorization); declare taking responsibility for this declaration, that the inventor (s) is (are):; S M. Paul KREMER, 72 rue du Nord, 7242_Walferdange, Luxembourg claim) for the above patent application the priority of one (or more) application (s) of 7) -........_ .. .................................................. .................................................. ................................... filed in (8) ____________________________________________________________. 1.

on (9) .............................................. .................................................. .................................................. .................................................. .................................................. .. · .....-.......

under N ° (10) __.......................................... .................................................. .................................................. .................................................. ...................... ...........................

in the name of (11) ............................................ .................................................. .................................................. .................................................. ....................................... f .......... ...........................

place) domicile for him (her) and, if designated, for his representative, in Luxembourg__________________________________________________________________ .............. 46 ....... rue du Cimetière, Luxembourg_______ ________________________________________________________________________________________________________________ / 12) request (s) the grant of a patent for the invention for the subject described and represented in the abovementioned appendices, with postponement of this grant to ................... .... ........._...............................- ____________ months- (13 )

The agent ^ r ^ "^"? _ ^ ................................................ .................................................. ...............................: ........ (14) s '' * ^ Π. Deposit Minutes

The above patent application has been filed with the Ministry of the Economy and the Middle Classes, Department of Intellectual Property in Luxembourg, dated: December 16, 1986

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/% \ Pr. The Minister of Economy and the Middle Classes, at 15 °? hours f £ {f. \ 4. d.

î £: Cf .l% = l £ I Âf | 5; Y- "’ -r: \ rs I The head of the dj4a intellectual property department, X * ®. \ W "'4 /? / * / 1 / -1 U / / έ \ EXPLANATIONS RELATING TO THE FORMUZ ^ iKE fejÔÊKÿfc' '' '1 / fl) If there is a request for certificates! Addition to ^ Lgnflfipal. the main patent No ___-........ Sa ............ ”- i2i enter the name, first name, prefs ^ î! jz.

address of the applicant, when the latter is a private individual or sodal denominations, iuridial form. address of his own company, when the applicant is a legal person - (3i enter i ‘BL-3955 I“ Descriptive memorandum filed in support of a patent application for:

Diaphragm valve.

CEODEUX S.A.

24, route de Diekirch L - 7440 LINTGEN

• i r * Ί

R MEMBRRNE TAP

The present invention relates to a valve with mem ^ -brarie for compressed or liquefied gases, comprising a body enclosing a closure member with a sealing surface at the intersection of an inlet pipe and a gas outlet pipe and a piston subjected to the action of elastic means, control means connected to said closure member by means of a pusher and said piston, as well as sealing means arranged between the pusher and the piston.

There are different types of taps for pressurized gas, which differ essentially by their sealing system with respect to the atmosphere and which each have their advantages and disadvantages. This is how valves in which sealing is ensured by an O-ring or tamping have the advantage of a longer duration and that of deteriorating only gradually, that is to say that gas leaks become gradually larger. Diaphragm valves have the advantage of being able to contain high pressures and not being attacked by gases. On the other hand, the membranes have a relatively modest duration, and in the event of wear, the rupture is practically instantaneous, which means a significant gas leak in the event of rupture. These valves therefore do not offer enough safety in applications with dangerous or toxic gases.

The purpose of the present invention is to provide a

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2 new diaphragm valve which offers more safety than known valves.

This objective is achieved according to a preferred embodiment of the invention by a tap of the type described in the preamble which is essentially characterized in that said sealing means consist of a flexible membrane and a seal arranged on both sides. on the other side of a disc and of a cylindrical spacer sleeve and in that the space between the membrane and the seal is in communication through said sleeve and the valve body with external means making it possible to detect the presence of gas in said space.

The seal is preferably also constituted by a flexible membrane.

Said communication preferably consists of a radial perforation of the sleeve and a radial bore of the body of the valve.

A closure cap is designed to be tightly screwed into said hole to interrupt or release said communication.

Since only the diaphragm on the piston side is exposed to your gas pressure, we can reasonably assume that this diaphragm wears out more quickly than the diaphragm on the side of the pusher.

The valve proposed above has advantages over the existing valve. In the event of rupture of the membrane exposed to the gas, there is no uncontrolled leak “'' l 3 towards the atmosphere and the detection of the presence of gas in the space between the two membranes makes it possible to determine the moment or the membrane exposed to the gas is worn out and must be replaced. The other advantage is that the closing of the communication of the space between the membranes with the outside eliminates the need for an immediate replacement of the worn membrane since the tap can function perfectly and tightly with the other membrane.

□ other particularities and characteristics will emerge from the detailed description of a preferred embodiment, presented below, by way of illustration, with reference to the single figure which shows a general view of a tap in vertical section.

The tap shown in this figure comprises a body 10, for example made of stainless steel, the lower part of which is provided with a thread allowing it to be screwed directly onto a gas container. □ In the example shown, the body 10 of the valve comprises an axial inlet channel 12 and a radial outlet channel 14. At the intersection of these two channels 12 and 14 is a sealing member comprising a pad 16, for example made of synthetic material such as PCTFE which cooperates with a seat 1Ö to adjust, for example release or close The passage between the channels 12 and 14. The part 16 is wedged in the end of a rod 22 whose opposite end is solid *. ’T 4 daire a piston 24 with a domed head. Around your rod 22 is disposed a helical spring 26 resting on the one hand on the piston 24 and on the other hand on a ring 26 retained by an internal shoulder of the axial bore of the body 10. This spring 26 has by Consequently, there is a tendency to lift the tablet 16 from its seat 16 to open the passage between the channels 12 and 14.

An upper rod 30 with an external screw thread passes through a cable gland 32, in turn screwed into the upper part of the body 10. The rod 30 can therefore be moved axially by rotation, for example, by means of the handwheel 34.

In the bottom of the tow 32 is a pusher 36 whose lower surface is curved and whose upper surface is in contact with the lower end of the rod 30 to transfer the axial movement of the latter on the piston 24 against spring action 26.

Contrary to the state of the art according to which the sealing towards the outside is ensured by a single membrane consisting, for example, of a packet of thin stainless steel discs, disposed between the pusher 38 and the piston 24, the The present invention provides two membranes 40, 42 arranged on either side of a disc 36 with rounded faces which transmits the movements of the pusher 36 on the piston 24 and vice versa. The upper membrane 42 is stretched between the lower edge of the tow 32 and an annular sleeve Γ> Γ 5 44 around the disc 10, while the lower membrane is stretched between this sleeve 44 and an internal recess of the axial bore of the body 10 tap. Each of these membranes 40, 42 is capable, by itself, of ensuring sealing towards the outside.

A radial perforation 46 in the socket 44 establishes communication of the space between the two membranes 40, 42 and a radial bore 40 in the body 10 of the valve. This communication can however be closed by a closure plug 50 designed, for example, in the form of countersunk screws which can be screwed into the bore 46 and the conical tip of which closes this communication in a sealed manner. In the example presented, a lateral channel 52 opening into the bottom of the bore 46 makes it possible, when the plug 50 is loose to detect gas in the space between the two membranes 40, 42 that is to say the verification whether the membrane 40 is worn or not. This control can be carried out in different ways. The simplest is to directly monitor leaks through channel 52, for example, by the presence of bubbles. Another way is to monitor the increase in pressure in the space between the two membranes 40, 42, using a pressure gauge. It is also possible to provide alarm systems with optical or audible signaling. In the case of toxic or dangerous gases, it is also possible to connect the bore 46 to a station for neutralizing or washing the gases which escape through the mem-

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6 'has worn brane 40. As soon as L there is wear on this membrane 40, the passage to the outside can be closed by means of the plug 50 and the use of the tap can continue until the time of repair, the membrane 42 being able to ensure, during this time, the sealing towards the outside.

The sleeve 44 preferably has on the outside a circular groove 54, which avoids having to ensure, during assembly, that the sleeve 44 is oriented in such a way that the perforations 46 and 46 are aligned. It should be noted that the present invention is not only applicable to shut-off valves, but also to regulating valves, regulators and the like, whether it be pressurized gases, liquefied gases or simply pressurized liquids. .

It remains to be noted that it is possible, as a variant, to replace the membrane 42 by another sealing means, eg an O-ring, a packing, etc.

Claims (6)

7 • * * 1.) Diaphragm valve for compressed gas that liquefies including a body due) enclosing a closure member with a sealing surface at the intersection of an intake pipe (12) and a gas outlet (14) and a piston (24) subjected to the action of elastic means (26), control means connected to said closure member by means of a pusher C3Ö) and said piston (24), as well as sealing means arranged between the pusher (38) and the piston (24), characterized in that the said sealing means consist of a flexible membrane (40) and a seal arranged on the side and on the other side of a disc (36) and a cylindrical spacer sleeve (44) and in that the space between the membrane (40) and the seal is in communication through said sleeve (44) and the valve body (10) with the external means making it possible to detect the presence of gas in said space. 2.) Tap according to claim 1, characterized in that the seal is constituted by a flexible metal membrane (42). 3.) Tap according to claim 2, characterized in that said membranes (40,42) are metal membranes. 4.) Tap according to any one of claims 1 to 3, characterized in that said communication is constituted by a radial perforation (46) of the '* 4 a douiLLe C44) and a radial bore. C46) of body CIO) of the tap. .1 5. J Tap according to claim 4, characterized by a closure plug C50) designed to be screwed, in a sealed manner, in said hole C48) to interrupt or release said communication. 6.) Tap according to claim 1, characterized in that the opposite faces of the disc C36) are curved.