FR2611849A1 - INTERCHANGEABLE ADJUSTING DEVICE FOR THERMOSTATIC VALVE - Google Patents

Abstract

THE INVENTION CONCERNS AN INTERCHANGEABLE ADJUSTING DEVICE ALLOWING TO ADAPT THE HYDRAULIC CHARACTERISTICS, THAT IS TO SAY THE FLOW COEFFICIENT, OF A THERMOSTATIC VALVE TO THE NOMINAL HEATING POWER OF A RADIATOR ON WHICH IT IS MOUNTED. THE ADJUSTMENT DEVICE INCLUDES A SINGLE-BLOCK HOLDER 10 CLOSED AT ONE OF ITS ENDS BY A CABLE GLAND 15, IN THE WALL OF WHICH AT LEAST ONE LIGHT 20 IS PROVIDED, AND THE OTHER END OF WHICH IS BORED BY A HOLE 29 OF WHICH THE DIAMETER IS CHOSEN TO PROVIDE A DETERMINED FLOW COEFFICIENT. SUCH A DEVICE ALLOWS A SINGLE AND SAME TYPE OF VALVE BODY TO BE GIVEN DIFFERENT FLOW COEFFICIENT VALUES BY CHANGING ONLY THE SLEEVE 10.

Description

2 61'1849

  The present invention relates to an internal adjustment device

  changeable to adapt the hydraulic characteristics, ie the flow coefficient, of a thermostatic valve to the nominal heat output of the heating radiator on which it is mounted.

  The invention relates more particularly to the thermostatic valves

  used for radiators installed in central heating installations supplied with superheated water by a network of

urban heating.

  In such central heating installations, the supply water is in most cases at a temperature between 110 and 130 C while the return water is at a temperature 5C to 60 C below that of the water. water supply. It can be seen that, with such a difference in temperature, the desired heating power of the radiators with a low flow of hot water is obtained. As a result, the thermostatic regulation of these radiators is difficult to achieve properly and can only be performed by a single model of thermostatic valve covering a wide range of flow rates. One solution would be to manufacture a series of faucets, each of them suitable for a narrow range of flows. But that would lead to too high manufacturing costs. The present invention aims to provide an interchangeable device mounting in a thermostatic roeinet body

  to adapt it to the heat transfer fluid flow therethrough.

  Thus, with only one valve body model, it will be possible to cover a wide range of flow rates by means of this interchangeable device which provides a determined flow coefficient at the thermostatic valve.

on which he climbed.

  For this purpose, the invention relates to an interchangeable adjustment device for a thermostatic valve whose body is provided with an inlet pipe, an outlet pipe and a pipe for mounting the adjustment device, said body having internally a ring-shaped annular flange, characterized in that it comprises a one-piece sheath integrally formed, of cylindrical general shape, closed by a gland, in the wall of which is formed at least one light, tooth the one end is screwed into the tubing provided for this purpose and the other end sealingly engaged in the annular flange of the body, the latter end being pierced with a hole whose diameter is chosen to

  provide a determined flow coefficient.

  The invention is explained below in detail with the aid of the attached drawing showing an embodiment, given by way of non-limiting example, drawing in which: the Figure is a sectional view of a body of thermostatic faucet

  equipped with an interchangeable adjusting device according to the invention.

  tion, shown in the closed position on the left part of the figure and in the open position on the right part of this same figure. The valve body 1 shown, intended for a central heating installation, comprises a threaded inlet pipe 2, of axis XX, where the heat transfer fluid arrives, an outlet pipe 3 towards the radiator (not shown), threaded , of axis YY perpendicular to the axis XX and a third pipe 4, of axis XX,

  provided with a tapping 5 and a thread 6, opposite the tubular

  2. The inner cavity 7 defined between the three pipes 2, 3 and 4 of the body 1 of the valve, internally present, the

  side communicating with the inlet pipe 2, an annular flange

  8 diameter of D-shaped seat.

  The adjustment device 9 which is the subject of the invention consists of a

  sleeve 10, of axis X-X, open at one of its ends, inside the

  a valve holder 11 at its end carrying a shutter valve 12, a return spring 13 concentric with the porteclapet 11, a bowl 14 into which the valve holder 11 can slide and on which one of the ends of

  spring 13. The fork 10 is closed by a gland 15.

  The sheath 10, of generally cylindrical shape X-X axis, comprises successively from top to bottom in the figure, on its outer surface: - a hexagon 16; - flange urn 17 whose lower face is a seal range; a threaded portion 18; a cylindrical portion 19 of smaller diameter than that of the threaded portion 18 in which two lumens 20 are formed;

  opposite of rectangular section. The diameter of the cylindrical part

  drique 19 is greater than that D of the flange 8 of the body 1; a cylindrical portion 21, of small thickness, whose diameter is slightly smaller than that of the flange 8 of the body 1, connected to the cylindrical portion 19 by a groove 22 in which

  is housed a ring seal 23.

  Inside the sleeve 10 are machined successively, from top to bottom in the figure: - a cylindrical bore 24 of axis X-X; a tapping 25; a bore 26, of axis X-X, of smaller diameter than that of the bore 24, whose connection with the tapping 25 forms a radial shoulder 42. This bore 26 extends to the bottom of the sleeve 10; a flange 27, pierced with a frustoconical bore 28, converging

  downwards, protruding into the bore 26, about half way

height of it.

  The end of the sheath 10 opposite the bore 24 is pierced with a hole 29 which extends towards the inside of the shovel by a conical bowl 30, flared, forming a seat for the valve 12. The diameter of the hole 29 is adapted to provide a determined flow coefficient. The valve holder 11, of cylindrical general shape of axis XX has at one of its ends a head whose connection with the body of the valve holder forms a shoulder 31 and at its other end a shoulder 32 and one or more bolting grooves 33 (one in the embodiment shown). It ends with a projecting conical part 34. The porteclapet 11 is pierced about two thirds of its length with a blind hole 35 which opens into a

bowl 36 formed in his head.

  The valve 12, made of a heat-resistant elastomeric material, has the shape of a cone truncation of small conicity, of axis X-X, the smallest of the bases is contiguous to a cone of wide angle at the top. This angle is slightly less than the angle at the apex of the conical bowl 30, forming a seat, of the sheath 10. The valve 12 is pierced with a blind hole, opening into the base of the valve, whose shape is conjugated with of the groove 33 and the conical end 34 of the valve holder. The diameter of the base of the valve 12 is

  slightly larger than the smallest diameter of the tronco-bore

  28 The gland 15, of known type, comprises a control rod 37, provided with a lock washer 38, an O-ring 39 sealing the passage of the rod 37 and a cup 40

now in place the seal 39.

  The mounting of the device 9 according to the invention operates as follows. In the first place, the assembly of the flapper subassembly 12 for the valve holder 11 is carried out. For this purpose, the spring 13 is placed around the portapplette 11, resting on the shoulder 31; it is then compressed by means of the bowl 14, then a washer 41 is put in abutment against the shoulder 32, finally the valve 12 is pressed force on the projecting end 34 of the valve holder 11, the groove 33 of this last and its conjugate form formed in the blind hole of the valve 12 providing a resistant hooking. This is the valve 12

  which locks this subset.

  The valve subassembly 12 - valve holder 11 is then introduced into the sheath 10. The valve 12 whose diameter of the base is greater than the diameter of the frustoconical bore 28 of the flange 27 passes through it by force. the elasticity of

  elastomer material that constitutes it. The valve subassembly 12 -

  The valve holder 11 is then trapped in the sheath 10, the periphery of the base of the valve 12, abutting against the underside of the

  flange 27, preventing the subset from escaping.

  The assembly of the device 9 ends with the installation of the

  gland 15, which is screwed on the sleeve 10 by the tarau-

  25, the control rod 37 being engaged in the blind hole 35

  of the valve holder ll and bearing against the end of this hole. The étan-

  The gap between the gland 15 and the sleeve 10 is ensured by

  support of the stuffing box against the shoulder 42. The valve assembly 12 -

  valve holder is held in open position by the spring 13 which is supported by its ends, on the one hand, on the shoulder 31 of porteclapet 11, on the other hand, on the bowl 14, itself in support

  on the upper face of the flange 27 of the sheath 10.

  The device 9 is then put in place in the valve body 1 by screwing the sheath 10 into the tubing 4 thanks to the

  tapping 5 and the thread 18 which cooperate. Sheath tightness-

  body is provided by the underside of the flange 17 which bears against a corresponding shoulder of the tubing 4. When the sleeve 10 is screwed completely, its end provided with the hole 29 is engaged in the annular collar 8 of the body 1, the seal enter

  this and the sheath 10 being provided by the O-ring 23.

  The assembly of the valve is completed by the establishment of the thermostatic head (not shown) on the tubing 4 by screwing on the thread 6, the thermosensitive element of said head bearing directly or via a pusher on the free end

  of the control rod 37 of the valve 12.

  The advantages presented by the device that is the subject of the invention are the following: this device makes it possible to adapt the flow coefficient of a thermostatic valve while having only one type of valve body. Indeed, the hole 29 formed at the end of the sheath 10 has a larger or smaller diameter depending on the flow of coolant that we want to pass through the radiator. For a low flow rate, there will be mounted in the valve body 1 a device 9 whose diameter of the hole 29 is small, whereas, for a large flow, the hole 29 will be of a larger diameter. The greater or lesser pressure drop created by the hole 29 makes it possible for a

  given pressure to limit the flow of heat transfer fluid.

  This device makes it possible to easily correct a calculation error that is always possible in the design of a central heating installation. For this, simply replace the adjustment device originally mounted by another device better adapted

  without having to remove the thermostatic valve.

  - This device makes it possible to adapt a central heating installation to a decrease or an increase in the temperature of the heat transfer fluid distributed by the district heating network by changing only the adjustment device 9, the valve body

  originally mounted being preserved.

  - Replacement of the gland 15 as a result, for example, of the wear of the seal ring 39 is possible without the need to isolate the radiator. Indeed, when the gland 15 is separated from the sleeve 10, the seal is obtained by the fact that the valve 12 carries by the periphery of its base against the underside of the flange 27 of the sleeve 10, which prevents the heat transfer fluid to escape outside the faucet. - Keeping in place the constituent elements of the valve subassembly 12 - valve holder ll is provided by the valve 12 itself anchored at the end of the valve holder 11 by the groove 33 and the conjugate relief formed in the hole one-eyed flap 12, which allows

  a mechanized assembly of this subset.

  - The sleeve 10, monobloc, come from material, constitutes an envelope

  extremely resistant, protecting the mechanism it contains.

26 1 1849

Claims (5)

  1.- Interchangeable adjustment device for thermostatic valve whose body (1) is provided with an inlet pipe (2), an outlet pipe (3) and a pipe (4) for mounting the adjusting device, said body (1) internally having an annular collar (8) in the form of a seat, characterized in that it comprises a sheath (10) integrally formed, integrally cylindrical, axis XX, closed by a gland (15), in the wall of which is formed at least one lumen (20), one end of which is screwed into the tubing (4) provided for this purpose and the other end engaged sealingly in the annular flange (8) of the body (1), the latter end being pierced with a hole (29) of axis XX whose diameter is chosen to provide a flow coefficient determined.   2.- Device according to claim 1 characterized in that inside the sleeve (10) are arranged a valve holder (11), axis XX, provided at one end with a valve shutter (12), a return spring (13) concentric with the valve holder (11), and a   bowl (14), of axis X-X, in which the holder can slide   valve (11), the latter bearing on a flange (27)   arranged inside the sheath (10).   3.- Device according to claims 1 and 2 characterized in that   that the valve holder (11) has at one of its ends a head   whose connection with the body of the valve holder forms a sponge.   (31) and at the other end, which ends with a   protruding cone (34), at least one groove (33) hooking.   4.- Device according to claims 1 to 3 characterized in   the valve holder (11), the return spring (13), the bowl (14) and the valve (12) form an assembly, the assembly of which is ensured by the valve (12) force-fitted on the end of the valve holder (11) having the conical portion (34) protruding, the attachment of the valve (12) on the valve holder (11) being provided by the groove (33) engaged with a conjugate relief of a blind hole in the valve (12).   5.- Device according to claims 1 to 4 characterized in   that the diameter of the base of the valve (12) is greater than the smallest diameter of the frustoconical bore (28) of the flange (27) of the sleeve (10), which ensures the rear sealing of the valve (12)   when the gland (15) is disassembled.