BRPI0804168A2 - discharge valve improvement - Google Patents

Abstract

Automatic hydraulic shut-off type discharge valve enhancement is provided with a control seal (70) operating in conjunction with a seal slider (20) and a trigger seal (37) to allow the valve to release a certain volume of water in each flushing operation, regardless of the user's actuation time on a valve drive stem (30). According to the invention, the closure cap 15> of the mounting aperture 13a is internally provided with a tubular projection 50 around a firing seat (SD) and defining a control chamber (CC). which is maintained in fluid communication with the usual pressure chamber (CP) by a control seat (SC) .The control seal (70) comprises a cylindrical ring (71) mounted around the inner portion of the drive rod (30). ) and forced against an adjacent end face (20a) of the sealing slider (20) and to be moved to a closed condition, blocking any fluid communication from the pressure chamber (CP) with the control chamber (CC) and the seat of (SD) when moving the sealing slider (20) to the open position of the valve seat (14).

Description

"DISCHARGE VALVE IMPROVEMENT"

Field of the invention

The present invention relates to an improvement introduced in a hydraulic actuation discharge valve of the type provided with control means designed to enable the valve to release a certain volume of water in each discharge operation, regardless of the user's actuation time on the actuation button. valve. The invention is particularly, but not exclusively, applicable to a relief valve of the aforementioned type and further comprises a flow blocking record mounted on the valve body itself.

Prior art

Discharge valves having the usual sealing slider mounted on the inside of an internal chamber are well known in the prior art, forming with it a pressure chamber which, while kept pressurized by the proper pressure of the hydraulic network, retains the slant slider seated against a valve seat, closing it last one. When the user presses the valve actuation means, the pressure chamber depressurizes and the slider (seal inside the inner chamber) moves to a valve opening position.

In order for the valve to be automatically closed after a period of time, regardless of the user's continued engagement with the operating medium, the valve is provided with an additional control seal, disposed within the depression chamber, to automatically block the depressurization of the latter and initiate closing. the discharge valve after a predetermined time from the actuation by the user, this time so that the discharge flow is sufficient to ensure adequate discharge.

While preventing excessive and unnecessary water consumption if the user remains acting on the valve operating means, the known constructions have the disadvantage of requiring a certain minimum axial length inside the valve body, particularly for the pressure chamber, for housing and operation of the valve. additional control seal. Thus, the known constructions for the control seal do not allow external finishes to be used at a higher height, that is, with less projection out of the building wall plane into which the valve body is embedded.

In addition to the above drawback, known constructions require the provision of a structural element, making the control diameter more complex and larger in diameter, requiring lower fabrication tolerances to ensure proper operation when in a closed condition, in which the hermetic lock must occur between the chamber. valve pressure and the water output of the valve. These known conditions can be found in PI9601561-6, PI9805525-9, PI0003905-5 and PI0600980-8.

Due to the aforementioned drawbacks, it is now desirable to provide a constructive solution that allows for a constructive simplification of the control seal, with reduction of the axial extension of the tubular portion of the valve body within which the pressure chamber is defined and the hand-actuated elements mounted. the valve by the user.

Summary of the invention

In order to eliminate the above-mentioned deficiencies related to known constructions, it is an object of the present invention to provide an improved flush valve of the automatic hydraulic closure type independent of the action of the operator, after having opened the valve opening, having a simple construction control seal and which allows a substantial reduction in the length of the pressure chamber. It is a further object of the invention to provide an improved discharge valve as mentioned above and which the control seal occupies a portion of the same space in the axial direction occupied by the valve main seal slider.

As already mentioned above, the refinement in question is applied to a hydraulically acting discharge valve and in whose known depression chamber a control seal is provided which, in a closed condition, to which it is displaced by the valve's own main seal slider upon opening of the latter. , blocks any fluid communication between the pressure chamber and the water outlet, allowing pressure chamber pressure and valve closing, even if the user remains acting on the valve drive shaft.

According to the invention, there is provided a control chamber internally formed in a valve cap, around the actuation rod and a defined deflection seat between the actuation rod and the latter through-hole through the cap. The control chamber is open to the valve's water outlet by firing and to the pressure chamber by an annular shaped control housing defined around an extension of the drive stem.

The invention further provides a cylindrical, elastomeric material-shaped control seal that is mounted around the drive rod and is constantly and elastically forced against an adjacent, preferably lowered, end face of the valve sealing slider.

When the valve sealing slider is moved to a valve opening position, it moves the control sealing along the drive stem, seating it against the control seat, thereby blocking any fluid communication from the pressure chamber with the trigger seat and the leaving the valve water and allowing pressure chamber pressurization and automatic valve closure, even if the user remains standing on the drive rod and thereby keeping the trigger seal away from the trigger seat. The above construction using a control chamber with a reduced axial extension, in conjunction with a height-reduced cylindrical ring-shaped control seal and yet preferably nestable in an annular sealing slide recess, simplifies arrangement, reduces its manufacturing cost and allows its use on relief valves whose drive bit nothing protrudes outside the face of the building wall on which the valve is installed.

Brief Description of Drawings

The invention will be described below with reference to the accompanying drawings, given by way of example of a possible embodiment of the invention and in which:

Figure 1 is a longitudinal cross-sectional view of a discharge valve of the type herein, embodying the embodiment object of the invention and the valve being in the closed and ungrounded condition;

Fig. 1A is a view similar to Fig. 1, but illustrating in greater detail the firing seal in the opening position of the firing seat when actuated by the user;

Fig. 1B is a view similar to Fig. 1A, illustrating the sealing slider in the open position of the sealing web and keeping the control seal in a closing condition of the control seat;

Fig. 1C is a view similar to Fig. 1B, illustrating the sealing slider returned to the closing position of the sealing seat by repressurizing the pressure chamber;

Figures 2 to 5 represent front, rear, side and diametrical sectional views V-V, respectively, of the control seal; and

Figures 6, 7, 8 and 9 represent a rear, rear, side and diametrical sectional view IX-IX, respectively, of a complementary sleeve constituting part of the control chamber.

Detailed Description of the Invention

As illustrated in the accompanying drawing, the flush valve of the present invention is of the type comprising a tubular body 10 provided with a water inlet 11 and a water outlet 12 between which the body 10 incorporates a median projection 13, also tubular, having a water port. assembly 13a disposed downstream of a valve housing 14 defined internally to the body 10 and through which the discharge water flow is selectively established from the water inlet 11 to the water outlet 12 upon opening of the discharge valve. The mounting aperture 13a is hermetically closed by a lid 15.

In the explanatory construction illustrated here, the relief valve further comprises a pressure chamber CP, downstream of the valve seat 14, within the hub 10 and housing a sealing slider 20 hydraulically displaceable between a closing position and a valve seat opening position 14, said sealing slider 20 limiting the pressure chamber CP towards the valve seat 14, the depression chamber CP being maintained in unrestricted constant fluid communication with the water inlet 11.

In the illustrated construction, the pressure chamber CP is defined within a cylindrical liner 16, constructed of suitable material, generally plastic, but may be formed of other materials and which is removably mounted within the tubular body 10, downstream of the valve seat. 14 by opening the mounting 13a of the tubular body 10. The provision of the cylindrical sleeve 16 allows the wear-fastened elements to be easily replaced without the disassembly of the tubular body 10 from their installation position generally in a masonry wall of a building. This construction is well known in the art, being one of the possible forms of valve construction to be subjected to the improvement object of the present invention.

However, it must be applied to a discharge valve fitted with a cylindrical liner 16, that is to say a discharge valve whose pressure chamber CP is defined by portions of the inner wall of the tube itself 10.

The sealing slider 20 may be constructed of any suitable material, such as metal, plastic, etc., and is provided with an extreme sealing member 21, generally elastomeric and seated against valve seat 14 to block the flow of discharge water as illustrated in the figures. 1, IA and 1C. The sealing slider 20 is further provided with a circumferential element 22, generally of flexible material such as rubber, nylon or others and acting against the inner wall of the depression chamber CP, during the displacement of the sealing slider 20 between its closing and opening operating positions of the housing. valve seat 14.

Figure 1B illustrates the sealing slider 20 displaced for opening the valve seat 14.

The sealing slider 20 is airtight and slidably mounted around a drive rod 30 by at least one snap ring 33.

The sealing slider 20 is hermetically slidingly mounted around a cylindrical drive rod 30, which extends axially through the interior of the body 10, to an outer end 31 extending axially out of the tubular body 10 through the mounting aperture 13a and 15 through at least one sealing lip 15a attached to the lid 15 and carrying a drive button 40. The drive rod 30 has an inner end 32 which is slidably and rotatably locked to a locking element 18 generally in cup shape, disposed within the tubular body 10 and facing the valve seat 14. In the illustrated embodiment, the locking element 18 is threaded within the tubular body 10 upstream of the valve seat 14 such that, with the drive shaft 30 by the user is forced to rotate its threaded coupling to the tubular body10, axially shifting to a closed position where it is seated against a locking seat 19 mounted internally to the tubular body 10 upstream of the valve seat 14, in which position the locking element 18 interrupts the water supply to the valve seat 14. The locking element 18 is further displaceable to open position away from the locking seat 19 and in which the water supply to the valve seat 14 is released. In figures 1, IA, 1B and 1C the locking element 18 is illustrated in the open position and away from the locking seat 19, in a known constructive arrangement. As illustrated, the locking seat 19 may be threaded internally to the body 10, the latter being sealed by at least one sealing ring 19a in elastomer or any other suitable material.

As already mentioned, the improvement in question is applied to a relief valve in which the automatic hydraulic closing starts when the user opens, automatically closing the valve seat 14 after a certain time, regardless of how long the user remains depressing the actuating rod. 30

In the illustrated exemplary construction, the relief valve is of the type which has, between the sealing slider 20 and a cap 17 of the cylindrical sleeve 16, the depression chamber CP housing control means capable of ensuring automatic closure of the discharge valve after a certain amount of time has elapsed. their opening and will be described later.

Still according to the illustrated embodiment, the cylindrical sleeve 16, also known construction, is fitted inside the tubular body 10 through its mounting opening 13a and is adapted by means of at least one sealing ring 16a inside the locking seat 19, it should be understood that other inner jacket constructions 16 may be carried out whether or not operatively associated with the locking seat 19.

As shown in Fig. 1, the pressure chamber CP is previously closed by the lid 17, the latter being generally provided with an annular SD firing seat formed in conjunction with the cylindrical outer surface driving rod 30 and operating in conjunction with a sealant. 37, generally in the form of a ring loaded by the drive rod 30.

Thus, upon actuation of the valve by the user, the actuation rod 30 moves the firing seal 37 away from the SD firing seat, allowing pressure chamber CP pressurization and the consequent displacement of the sealing slider 20 away from the valve seat 14. by opening the discharge valve and allowing a discharge flow to be established from water inlet 11 to water outlet 12.

In accordance with the invention the cap 15 of the body 10 or cap 17 of the cylindrical liner 16, there is internally provided a tubular projection 50 surrounding the inner portion of the drive rod 30 and the firing seat SD and defining in it an inner chamber. DC control that is maintained in fluid communication with a CP pressure chamber by an annular-shaped SC control seat defined between drive rod 30 and tubular projection 50 and which is selectively closed by a control seal 70 mounted around the inner portion of the rod. 20 and the DC control chamber.

As illustrated, cap 15 is internally and operably associated with a closure cap 17 blocking the adjacent end of the CP pressure chamber and incorporating the tubular projection 50 defining the CC control chamber.

Preferably, the tubular projection 50 comprises a basic portion 51 incorporated in a one-piece to the closure cap 17 and into which a complementary glove 60 fitted with an annular end wall 61 whose central hole 61a is pierced with a small width through an extension is retained and retained. of the drive rod 30, central dithofore 61a defining, together with the outer surface of the drive rod 30, the control seat SC.

In the exemplary construction and illustrated in the accompanying drawings, the complementary sleeve 60 comprises a single body having an externally frusto-conical end portion 60a to be fitted within the basic portion 51 of the tubular projection 50, a reduced diameter mid portion 60b into which a rib is fitted peripheral portion 52 of the basic portion 51, and a rear end portion 60c internally embodying the annular end wall 61 and externally a flange 62 defining a spring seating seat 80 whose features will be described later. When mounting the supplemental sleeve 60 within the tubular projection 50, a seal must be obtained between said tubular sleeve 60 and the tubular projection 50 to prevent fluid communication between the pressure chamber C P and the DC control chamber, when closing the SC control network by the control seal 70, by engaging the tubular projection 51 and the complementary glove 60. According to a preferred construction, the seal between the tubular sleeve 60 and the assembly defined by tubular projection 50 is obtained by providing an annular sealing ring 90, constantly pressed between the anterior edge of the outermost conical trunk portion 60a of the tubular sleeve 60 and an annular surface region of the lid 17 of the cylindrical sleeve 16, defined around the seat of SD shooting.

In accordance with the inventive construction proposed herein, the control seal 70 comprises an elastomeric cylindrical ring 71 mounted around the inner portion of the drive shaft 30 and constantly forced against an adjacent end face 20a of the sealing slider 20, and displaced therein. its closed condition, seated against the SC control seat, blocking any fluid communication from the CP pressure chamber to the CC control chamber and with and with the SD trigger seat when sealing slider 20 moves to the valve seat opening position 14 .

As can be seen, when the user presses the drive rod away from the firing seal 37 from the SD firing seat, depressurization of the CP pressure chamber is obtained by being conventionally and restrictively connected to the water outlet 12 via the SD firing seat. and a suitable discharge channel of known construction. With pressurization of the CP pressure chamber, the hydraulic pressure upstream of the valve seat 14 causes the sealing slider 20 to move away from the valve wall 14, opening the water passage and loading the control seal 70 toward to the SC control seat, closing the latter and preventing further depression of the CP depression chamber through the SD firing seat, even if it remains open at the user's insistence on continuing to depress the drive rod 30.

In the illustrated construction, the cylindrical ring 71, defined as the control sealing 70, has an annular rear face 72 seated against adjacent end face 20a sealing scrubber 20 and provided with a plurality of water-passing radial grooves 72a extending from one another of the edges outer and inner peripheries of ring 71, and an annular front face 73 to be seated against the SC control seat to block any fluid communication from the CP pressure chamber with the DC control chamber and the SD trigger seat.

In the exemplary construction illustrated in the drawings, the cylindrical ring 71 defining control seal 70 has its central bore 74 formed by a cylindrical portion74a adjacent to the annular rear face 72 and slightly larger than the diameter of the adjacent drive shaft extension 30, and by a trunk-tapered portion74b adjacent the annular anterior face 73 and having its base having a diameter smaller than that of the adjacent extension of the drive rod 30 and connected to the trechocylindrical 74a by an annular step 74c. The largest base of the stem-tapered portion 74b is coplanar to the anterior-annular face 73 of the control seal 70, having the same diameter of the cylindrical portion 74a.

As can be seen, the sealing slider 20, illustrated in the accompanying drawings, is of the type in which its adjacent end face 20a is provided with an annular recess 23 limited to the drive rod 30. This construction is well known in the art. It turns out that the cylindrical ring 71, which defines the control seal 70 of the present invention, has its annular rear face 72 seated at the bottom of the annular recess 23. Whereas the axial length of the control seal 70 is equal to or less than the depth of the annular recess 23, of the adjacent extreme end 20a of the sealing slider 20, the latter slider remains within the full extent of the sealing slider 20 itself, not requiring any extension of the middle portion 13 of scope 10 to absorb displacement of the sealant slider of the control seal 70 as already mentioned in the objects of the invention.

In addition to the above, it should be noted that the cylindrical ring 71 defining control seal 70 is constantly forced against the sealing slider 20 by a spring 80 having an end seated on a degenerate 71a of the cylindrical ring 71 and an opposite end seated against the cap 15, the closure cap 17, the flange 62 of the complementary sleeve 60 or even against the CC control chamber defining tubular fitting 50. In the illustrated construction, the spring 80 has a conical shape, with its smaller base seated on the control seal 70, with the that the usual locking of cylindrical coil springs in this type of assembly is avoided.

Although only a possible valve construction suitable for the improvement object of the present invention has been illustrated herein, it should be understood that changes in shape and disposition of the different component parts may be made without departing from the constructive concept as defined in the accompanying claims. report.

Claims (11)

1.- Drain valve development of a type comprising a body (10) having a water inlet (11), mounting opening (13a) closed by a cap (15, 17) and internally defining a pressure chamber ( CP) maintained in restricted fluid communication with the water inlet (11) and selective with the water outlet (12) through a firing seat (SD) and housing: a sealing slider (20), to be hydraulically moved between closing positions and opening the valve seat (14); a control seal (70) movable between open and closed conditions, in which it provides and prevents, respectively, fluid communication between the depression chamber (CP) and the firing seat (SD); and a trigger seal (37) to be moved between closing and opening positions of the firing seat (SD), said valve further comprising a drive rod (30) having an outer end to the cover (15) and an inner portion to the body (10) and carrying the firing seal (37), the improvement being characterized in that the cap (15, -17) is internally provided with a tubular projection (50) surrounding the inner portion of the drive rod (30) and the seat (SD) and defining a control chamber (CC) which is maintained in fluid communication with the pressure chamber (CP) by an annular deform control seat (SC) defined between the drive rod (30) and the projection The control seal (70) comprises an elastomeric cylindrical ring (71) mounted around the inner portion of the drive rod (30) and constantly forced against an adjacent end face (20a) of the cur the seal (20) and be displaced to its closed condition, seated against the control seat (SC), blocking any fluid communication from the pressure chamber (CP) to the control chamber (CC) and the firing seat (SD), when moving the sealing slider (20) to the opening position of the valve seat (14). Improvement according to Claim 1, characterized in that the cylindrical ring (71) defining the control seal (70) has an annular rear face (72) seated against the adjacent end face (20a) of the sealing slider. (20) and provided with a plurality of water-passing radial grooves (72a) extending from one another of the outer and inner peripheral edges of the cylindrical ring (71) and an annular front (73) to be seated against the control seat (SC) ) to block any fluid pressure chamber (CP) communication with the control chamber (DC) and the trigger seat (SD). Improvement according to any one of claims 1 and 2, characterized in that the circumferential ring (71) defining the control seal (70) has its central bore (74) formed by an adjacent trechocylindric (74a) to the annular posterior face (72) and slightly larger than the diameter of the adjacent extension of the drive rod (30), and by a trunk-tapered portion (74b), adjacent to the anterior annular face (73) and having its smaller base with smaller diameter than that of the adjacent extension of the drive rod (30) and connected to the cylindrical section (74a) by a degranuelellar (74c), the largest base of the trunk-tapered portion (74b) being coplanar to the annular front face (73) of the control seal (70) and having the same diameter as the trechocylindrical (74a). 4. An improvement according to any one of claims 2 and 3, wherein said adjacent end face (20a) of the sealing slider (20) is provided with an annular recess (23) circumscribed to the drive rod (30), characterized in that that the cylindrical ring (71) defining control seal (70) has its annular rear face (72) seated at the bottom of the undercut (23). Improvement according to Claim 4, characterized in that the axial length of the control seal (70) is equal to or less than the depth of the annular recess (23) of the adjacent extreme face (20a) of the sealant (20). . Improvement according to any one of claims 1 to 5, characterized in that the cylindrical ring (71) defining the control seal (70) is constantly forced against the sealing slider (20) by a spring (80). having an end seated on a stepper (71a) of the cylindrical ring (71) and an end seated against the cap (15). Improvement according to Claim 6, characterized in that the spring (80) is conical in shape, with its smaller base resting on the control seal (70). 8. Improvement according to any one of claims 1 to 7, characterized in that the cap (15) is internally and operably associated with a closure cap (17) blocking the adjacent end of the pressure chamber (CP) and incorporating the projection. tube (50) defining the control chamber (CC). An improvement according to claim 8, characterized in that the tubular projection (50) comprises a basic portion (51) incorporated in one piece into the closure cap (17) and into which a complementary sleeve is fitted erectly. 60, in a single body, provided with an annular end wall (61) whose furocentral (61a) is pierced with a small radial clearance by an extension of the drive rod (30), said furocentral (61a) defining, in together with the outer surface of the drive rod (30), the control seat (SC). An improvement according to claim 8, characterized in that the complementary sleeve (60) comprises an externally frusto-conical end portion (60a) to be fitted within the basic portion (51) of the tubular projection (50). ), a median portion (60b) of reduced diameter, into which an inner peripheral rib (52) of the base portion (51), a rear end portion (60c) internally incorporating the annular extreme wall (61) and, externally, a flange (62) defining a spring seating seat (80). 11. An improvement according to claim 9 or 10 further comprising an annular sealing gasket (90) disposed and compressed between the anterior edge of the luvatubular (60) and a confronting annular surface portion of the cap ( 17) in order to prevent fluid communication between the pressure (CP) and control (CC) chambers by fitting between the tubular projection (51) and the complementary sleeve (60).