BRPI0804168B1 - discharge valve improvement - Google Patents

Abstract

automatic hydraulic shut-off type relief valve and 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) to the control chamber (cc) and the seat of (sd) when the sealing slider (20) is moved to the valve seat opening position (14).

Description

(54) Title: IMPROVEMENT IN DISCHARGE VALVE (51) Int.CI .: E03D 3/02.

(73) Holder (s): DURATEX S.A ..

(72) Inventor (s): LAÉRCIO OLIVEIRA DE FIGUEIREDO.

(57) Summary: Improvement in the discharge valve of the type of automatic hydraulic closing and provided with a control seal (70) operating together with a sealing slider (20) and a firing seal (37), to allow the valve release a certain volume of water in each discharge operation, regardless of the time the user acts on a valve actuation rod (30). According to the invention, the cover (15>, for closing the mounting opening (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 extreme face (20a) of the sealing cursor (20) and to be moved to a closed condition, blocking any fluid communication from the pressure chamber (CP) with the control chamber (CC) and with the seat of trigger (SD), when the sealing cursor (20) is moved to the opening position of the valve seat (14).

IMPROVEMENT IN DRAIN VALVE

Field of invention

The present invention refers to an improvement introduced in a hydraulic-operated discharge valve of the type provided with control means designed to allow the valve to release a certain volume of water in each discharge operation, regardless of the user's operating time over the valve activation button. The invention is particularly, but not exclusively, applicable to a discharge valve of the aforementioned type and which further comprises a flow blocking valve mounted on the valve body itself.

Prior art

Discharge valves with the usual sealing slider mounted inside an internal chamber are well known in the prior art, thereby forming a pressure chamber that, while being kept pressurized by the hydraulic network pressure itself, retains the sealing slider seated against a valve seat, closing the latter. When the user presses the valve actuation means, the pressure chamber depressurizes and the sealing cursor moves, inside the inner chamber, to a valve opening position.

In order for the valve to automatically close after a certain time, regardless of the user's continued action on the actuating means, the valve is provided with an additional control seal, arranged inside the pressure chamber, to automatically block the depressurization of the latter and start closing the discharge valve after a predetermined time has elapsed since the actuation by the user, this time being regulated so that the discharge flow is sufficient to guarantee an adequate discharge.

Despite preventing excessive and unnecessary water consumption if the user remains acting on the valve actuation means, the known constructions present the drawback of requiring a certain minimum axial extension inside the valve body, particularly for the pressure chamber, for housing and operation of the additional control seal. Thus, the known constructions for the control seal do not allow the use of external finishes of lower height, that is, with less projection outside the plane of the building wall, in which the valve body is embedded.

In addition to the above inconvenience, known constructions require the provision of a structural element, making the control seal more complex and of greater diametrical dimension, requiring lower manufacturing tolerances to guarantee its correct operation when in the closed condition, in which it must occur the hermetic lock between the pressure chamber of the valve and the water outlet of the latter. These known conditions can be found in documents 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 a constructive simplification of the control seal, with a reduction in the axial extension of the tubular portion of the valve body inside which the pressure chamber is defined and user manually operated valve elements.

Summary of the invention

In order to eliminate the deficiencies mentioned above and related to known constructions, it becomes an objective of the present invention to provide an improved discharge valve, of the type of automatic hydraulic closing and independent of the operator's action, after having activated the opening of the valve, presenting a control seal of simple construction that allows a substantial reduction in the length of the pressure chamber.

It is also an objective of the invention to provide an improved discharge valve, as mentioned above, which has the control seal occupying a portion of the same space, in the axial direction, occupied by the main valve seal cursor.

As already mentioned above, the improvement in question is applied to a discharge valve with hydraulic activation and in whose known pressure chamber a control seal is provided which, in a closed condition, to which it is moved by the main valve when opening the latter, blocks any fluid communication between the pressure chamber and the water outlet, allowing the pressure chamber to be repressurized and the valve closed, even if the user remains acting on the valve actuation stem.

According to the invention, a control chamber internally formed in a valve cover is provided, around the actuation rod and a firing seat defined between the actuation rod and the passage hole of the latter through the cover. The control chamber is opened for the water outlet of the valve through firing and for the pressure chamber through an annular control seat, defined around an extension of the actuation stem.

The invention also provides a control seal in the form of a cylindrical ring, made of elastomeric material, mounted around the actuation rod and constantly and elastically forced against an adjacent extreme face, preferably lowered, of the valve sealing slider. When the valve sealing slider is moved to an opening position of the valve, it moves the control seal along the actuation stem, settling it against the control seat, thereby blocking any fluid communication from the pressure chamber to the seat the valve and allowing water to repressurize the pressure chamber and automatically close the valve, even if the user continues to act on the actuation stem and thereby keep the firing seal away from the firing seat.

The aforementioned construction, using a fixed control chamber and of reduced axial extension, together with a control seal in the form of a cylindrical ring of low height and still preferably nesting in an annular recess of the sealing cursor, simplifies the arrangement, reduces its manufacturing cost and allows its use in discharge valves whose actuation mechanism projects little or nothing protruding from the face of the building wall in which the valve is installed.

Brief description of the drawings

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

Figure 1 is a longitudinal diametrical cross-sectional view of a discharge valve of the type considered here, incorporating the improvement object of the invention and the valve being in the closed and not operated condition;

Figure IA is a view similar to Figure 1, but illustrating, in enlarged detail, the firing seal in the opening position of the firing seat when activated by the user;

Figure IB is a view similar to Figure IA, but illustrating the sealing cursor in the opening position of the sealing seat and keeping the control seal in a condition of closing the control seat;

Figure IC is a view similar to figure IB, but illustrating the sealing cursor returned to the closed position of the sealing seat by repressurizing the pressure chamber;

Figures 2 to 5 represent views in posterior, posterior, lateral and diametrical section V-V, respectively, of the control seal; and

Figures 6, 7, 8 and 9 represent a rear, rear, side and diametrical section view IX-IX, respectively, of a complementary glove that forms part of the control chamber.

Detailed description of the invention

As shown in the attached drawing, the discharge valve of the present invention is of the type that comprises a tubular body 10 provided with a water inlet 11 and a water outlet 12 among which the body 10 incorporates a median projection 13, also tubular , having an assembly opening 13a disposed downstream of a valve seat 14 defined internally to the body 10 and through which the discharge water flow from the water inlet 11 to the water outlet 12 is selectively established, when opening the discharge valve. The mounting opening 13a is hermetically closed by a lid 15.

In the explanatory construction illustrated here, the discharge valve further comprises a pressure chamber CP, downstream of the valve seat 14, inside the tubular body 10 and housing a sealing slide 20 hydraulically displaceable between a closing position and an opening position the valve seat 14, said sealing cursor 20 limiting the pressure chamber CP towards the valve seat 14, the pressure chamber CP being maintained in constant and restricted fluid communication with the water inlet 11.

In the illustrated construction, the pressure chamber CP is defined inside a cylindrical jacket 16, constructed in suitable material, usually in plastic material, but can be formed in other materials and which is removably mounted inside the tubular body 10, downstream the valve seat 14, through the mounting opening 13a of the tubular body 10. The provision of the cylindrical sleeve 16 allows the elements subjected to wear to be easily replaced without the need to disassemble the tubular body 10 from its installation position usually 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 without the cylindrical jacket 16, that is, to a discharge valve whose pressure chamber CP is defined by portions of the inner wall of the tubular body 10.

The sealing slide 20 can be constructed of any suitable material, such as metal, plastic, etc., and is provided with an extreme sealing element 21, generally made of elastomer and settable against the valve seat 14 to block the flow of discharge water. as illustrated in figures 1, IA and IC. The sealing slider 20 is also provided with a circumferential element 22, generally made of flexible material such as rubber, nylon or others and acting against the inner wall of the CP pressure chamber, during the displacement of the sealing slider 20 between its closing operational positions. and opening the valve seat 14.

Figure IB shows the sealing slider 20 moved to the opening position of the valve seat 14.

The sealing slide 20 is airtight and slidably mounted around a driving rod 30 by means of at least one elastic ring 33.

The sealing slider 20 is airtight and slidably mounted around a cylindrical drive rod 30, which extends axially inside the body 10, to have an external end 31 projecting axially out of the tubular body 10, through the opening mounting bracket 13a and its cover 15, passing through at least one seal retainer 15a attached to cover 15 and carrying an actuation button 40. The actuation rod 30 has an internal end 32 which is mounted, axially sliding and rotating locked to a locking element 18, generally in the form of a cup, arranged inside the tubular body 10 and facing the valve seat 14. In the illustrated configuration, the locking element 18 is threaded inside the tubular body 10, upstream the valve seat 14, so that, with the turning of the actuation stem 30 by the user, it is forced to rotate its threaded coupling to the tubular body 10, moving axially to a closed position, in the which is seated against a locking seat 19 mounted internally to the tubular body 10, upstream of the valve seat 14, a position in which the blocking element 18 interrupts the water supply to the valve seat 14. The blocking element 18 is further movable to an open position, away from the lock seat 19 and in which it releases the water supply to the valve seat 14. In figures 1, IA, IB and IC the locking element 18 is shown in the open position and away from the lock seat 19 , in a constructive arrangement already known. As shown, the locking seat 19 can 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 discharge valve in which the automatic hydraulic closing starts when the user opens the valve, automatically closing the valve seat 14 after a certain time, regardless of the time the user keep pressing the drive rod 30.

In the exemplary construction illustrated, the discharge valve is of the type that features, between the sealing slider 20 and a cap 17 of the cylindrical sleeve 16, the pressure chamber CP housing control means capable of guaranteeing the automatic closing of the discharge valve after a certain time has elapsed since its opening and which will be described later.

Also according to the illustrated configuration, the cylindrical jacket 16, of construction also known, is fitted inside the tubular body 10, through its mounting opening 13a, being adapted, by means of at least one sealing ring 16a, in the inside the locking seat 19, it should be understood that other constructions of inner liner 16 may be made operatively or not associated with the locking seat 19. As shown in figure 1, the pressure chamber CP is previously closed by the lid 17, this being the latter, usually provided with an annular SD firing seat, formed in conjunction with the external cylindrical surface of the actuation rod 30 and operating in conjunction with a firing seal 37, generally in the form of an o-ring carried by the actuation rod 30 .

Thus, when the valve is actuated by the user, the actuation rod 30 moves the firing seal 37 away from the SD firing seat, allowing the pressure chamber CP to be depressurized and the resulting sealing slider 20 0 away from the seat. of valve 14, opening the discharge valve and allowing a discharge flow to settle from the water inlet 11 to the water outlet 12.

According to the invention, the cap 15 of the body 10 or the cap 17 of the cylindrical sleeve 16, is internally provided with a tubular projection 50 involving the inner portion of the driving rod 30 and the firing seat SD and defining, in its interior, a DC control chamber that is maintained in fluid communication with a CP pressure chamber by an annular-shaped SC control seat, defined between the actuation rod 30 and the tubular projection 50 and which is selectively closed by a control seal 70 mounted around the inner portion of the drive rod 20 and the CC control chamber.

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

Preferably, the tubular projection 50 comprises a basic portion 51 incorporated, in one piece, to the closing cap 17 and in which a complementary sleeve 60 is provided and retained with an annular end wall 61 whose central hole 61a is passed through, with a small gap radial, by an extension of the driving rod 30, said central hole 61a defining, together with the external surface of the driving rod 30, the control seat SC.

In the exemplary construction and illustrated in the accompanying drawings, the complementary sleeve 60 comprises a single body showing an extreme external conical trunk portion 60a, to be fitted inside the basic portion 51 of the tubular projection 50, a median portion 60b of reduced diameter, inside from which an internal peripheral rib 52 of the basic portion 51 is fitted, and a rear end portion 60c incorporating, internally, the annular end wall 61 and, externally, a flange 62 defining a spring seat 80 whose characteristics will be described further up.

As can be seen, with the assembly of the complementary sleeve 60 inside the tubular projection 50, it becomes necessary to obtain a seal between said tubular sleeve 60 and the tubular projection 50, in order to avoid fluid communication between the chamber pressure sensor CP and the CC control chamber, when the control seat SC is closed by the control seal 70, through the fitting between the tubular projection 51 and the complementary sleeve 60. According to a preferred construction, the seal between the sleeve tubular 60 and the set defined by the tubular projection 50 is obtained by the provision of a sealing ring gasket 90, constantly pressed between the anterior edge of the extreme outer conical trunk 60a of the tubular sleeve 60 and a confronting ring surface region of the cap 17 cylindrical jacket 16, defined around the SD firing seat.

According to the inventive construction proposed here, the control seal 70 comprises a cylindrical ring 71 in elastomer and mounted around the inner portion of the driving rod 30 and constantly forced against an adjacent extreme face 20a, of the sealing slider 20, and the be moved to its closed condition, seated against the SC control seat, blocking any fluid communication from the CP pressure chamber with the CC control chamber and with and with the SD trigger seat, when the sealing cursor 20 is moved to the position for opening the valve seat 14.

As can be seen, when the user presses the actuation rod, moving the firing seal 37 away from the SD firing seat, the depressurization of the CP pressure chamber is obtained, as it is conventionally and strictly connected to the water outlet 12 through the SD firing seat and a suitable discharge channel of known construction. With the depressurization of the pressure chamber CP, the pressure of the hydraulic network, upstream of the valve seat 14, causes the sealing cursor 20 to move away from the valve seat 14, opening the water passage and loading the control seal 70 towards the control seat SC, closing the latter and preventing the depressurization of the CP pressure chamber from occurring through the SD trigger seat, even if it remains open at the user's insistence on continuing to press the actuation rod 30.

In the illustrated construction, the cylindrical ring 71, defining the control seal 70, has an annular back face 72 seated against adjacent end face 20a of the sealing slide 20 and provided with a plurality of radial grooves 72a, of water passage, extended from one to the other of the outer and inner peripheral edges of the cylindrical ring 71, and also an annular front face 73 to be seated against the control seat SC to block any fluid communication from the pressure chamber CP with the control chamber CC and with the seat of control SD shooting.

In the exemplary construction illustrated in the drawings, the cylindrical ring 71, defining the control seal 70, has its central hole 74 formed by a cylindrical section

74a, adjacent to the annular posterior face 72 and with a slightly larger diameter than the diameter of the adjacent extension of the driving rod 30, and by a tapered trunk section

5- 74b adjacent to the annular anterior face 73 and having its smaller base with a smaller diameter than that of the adjacent extension of the driving rod 30 and connected to the cylindrical section 74a by an annular step 74c. The largest base of the trunk-conical section 74b is coplanar to the anterior annular face 73 of the control seal 70, having the same diameter as the cylindrical section 74a.

As can be seen, the sealing cursor 20, illustrated in the accompanying drawings, is of the type in which its adjacent end face 20a is provided with an annular recess 23 circumscribed to the driving rod 30. This construction is well known in the art. It happens that the cylindrical ring 71, which defines the control seal 70 of the present invention, has its rear annular face 72 seated at the bottom of the annular recess 23. Considering that the axial length of the control seal 70 is equal to or less than the depth of the annular undercut 23, of the extreme adjacent face 20a of the sealing cursor 20, the latter now remains embedded within the full extension of the sealing cursor 20, requiring no increase in the extension of the median portion 13 of the body 10 to absorb the displacement of the sealing cursor 20 and control seal 70, as already mentioned in the objectives of the invention.

In addition to the above, it should be noted that the cylindrical ring 71, defining the control seal 70, is constantly forced against the sealing slider 20 by a spring 80 having one end seated on a peripheral step 71a of the cylindrical ring 71 and an opposite seated end against the lid 15, the closing lid 17, on the flange 62 of the complementary sleeve 60 or against the tubular projection 50 defining the CC control chamber. In the illustrated construction, the spring 80 has a conical shape, with its smaller base seated on the control seal 70, which avoids the usual locking of cylindrical helical springs in this type of assembly. Although only one possible constructive form of a valve suitable for receiving the improvement object of the present invention has been illustrated here, it should be understood that changes in the shape and layout of the different component parts can be made without departing from the constructive concept as defined. in the claims accompanying this report.

Claims (8)

1. Improvement in a discharge valve of the type comprising a body (10) having a water inlet (11), a water outlet (12), a valve seat (14) and an opening 5 assembly (13a) closed by a cover (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 10 hydraulically displaced between closing and opening positions of the valve seat (14); a control seal (70) displaceable between open and closed conditions, in which it provides and prevents, respectively, fluid communication between the pressure chamber (CP) and the firing seat (SD); and a seal Firing valve (37) to be moved between closing and opening positions of the firing seat (SD), said valve further comprising a driving rod (30) having an end external to the cover (15) and an internal portion to the body (10) and which loads the firing seal (37), where the cap 20 (15,17) is internally provided with a tubular projection (50) involving the inner portion of the actuation rod (30) and the firing seat (SD) and defining a control chamber (CC) that is maintained in fluid communication with the pressure chamber (CP) through a control seat (SC), 25 annular, defined between the drive rod (30) and the tubular projection (50), the control seal (70) comprising a cylindrical ring (71) in elastomer and mounted around the inner portion of the drive rod ( 30) and constantly forced against an adjacent extreme face 30 (20a) of the sealing cursor (20) and to be moved to its closed condition, seated against the control seat (SC), blocking any fluid communication from the pressure chamber (CP) with the control chamber (CC) and with the firing seat Petition 870180047992, of 06/05/2018, p. 9/14 (SD), when the sealing cursor (20) is moved to the valve seat opening position (14); said improvement being characterized by the fact that the cylindrical ring (71), which defines the 5 control (70), present a rear annular face (72) seated against the adjacent extreme face (20a) of the sealing slider (20) and provided with a plurality of radial grooves (72a) for water passage, extended from one to the other the outer and inner peripheral edges of the cylindrical ring (71), 10 and an annular front face (73) to be seated against the control seat (SC) to block any fluid communication from the pressure chamber (CP) with the control chamber (CC) and with the firing seat (SD); wherein the cylindrical ring (71), which defines the seal Control 15 (70), has its central hole (74) formed by a cylindrical section (74a), adjacent to the annular posterior face (72) and with a diameter slightly larger than the diameter of the adjacent extension of the driving rod (30), and through a trunk-conical section (74b), adjacent to the anterior annular face 20 (73) and having its smaller base with a smaller diameter than that of the adjacent extension of the driving rod (30) and connected to the cylindrical section (74a) by an annular step (74c), with the largest base of the trunk-conical section (74b) coplanar to the front annular face (73) of the control seal 25 (70) and having the same diameter as the cylindrical section (74a); wherein said adjacent extreme face (20a) of the sealing slider (20) is provided with an annular recess (23) circumscribed to the drive rod (30), wherein the cylindrical ring (71), defining the control seal (70 ), has 30 its posterior annular face (72) seated at the bottom of the annular recess (23). 2. Improvement, according to the claim 1, characterized by the fact that the axial length of the control seal (70) is equal to or less than the depth of the Petition 870180047992, of 06/05/2018, p. 10/14 annular recess (23) of the extreme adjacent face (20a) of the sealing slider (20). 3. Improvement, according to any one of claims 1 to 2, characterized by the fact that the ring 5 cylindrical (71), defining the control seal (70), to be constantly forced against the sealing cursor (20) by a spring (80) having one end seated on a peripheral step (71a) of the cylindrical ring (71) and one opposite end seated against the cover (15). 10 4. Improvement, according to the claim 3, characterized by the fact that the spring (80) has a conical shape, with its smaller base seated on the control seal (70). 5. Improvement, according to any of the 15 claims 1 to 4, characterized in that the cover (15) is internally and operatively associated with a closing cover (17), blocking the adjacent end of the pressure chamber (CP) and incorporating the tubular projection (50) defining the control chamber (CC). 20 6. Improvement, according to the claim 5, characterized in that the tubular projection (50) comprises a basic portion (51) incorporated, in a single piece, in the closing cap (17) and in which a complementary sleeve (60), in a single body, is fitted and retained, provided 25 of an extreme annular wall (61) whose central hole (61a) is passed, with small radial clearance, by an extension of the actuation rod (30), said central hole (61a) defining, together with the external surface of the rod drive (30), the control seat (SC). 30 7. Improvement, according to the claim 5, characterized by the fact that the complementary glove (60) comprises an extreme externally trunk-conical portion (60a), to be fitted inside the basic portion (51) of the tubular projection (50), a median portion (60b) in diameter Petition 870180047992, of 06/05/2018, p. 11/14 reduced, inside which is inserted an internal peripheral rib (52) of the basic portion (51), and an extreme posterior portion (60c) incorporating, internally, the annular extreme wall (61) and, externally, a flange (62) 5 defining a spring seat (80). 8. Improvement according to either of claims 6 or 7, characterized by the fact that it also comprises an annular sealing gasket (90), arranged and compressed between the front edge of the tubular sleeve (60) and a 10 facing the annular portion of the cover surface (17), in order to prevent fluid communication between the pressure (CP) and control (CC) chambers, through the fit between the tubular projection (51) and the complementary sleeve (60) . Petition 870180047992, of 06/05/2018, p. 12/14 1/6