Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L37/00—Couplings of the quick-acting type
  • F16L37/28—Couplings of the quick-acting type with fluid cut-off means
  • F16L37/38—Couplings of the quick-acting type with fluid cut-off means with fluid cut-off means in only one of the two pipe-end fittings
  • F16L37/40—Couplings of the quick-acting type with fluid cut-off means with fluid cut-off means in only one of the two pipe-end fittings with a lift valve being opened automatically when the coupling is applied
  • F16L37/42—Couplings of the quick-acting type with fluid cut-off means with fluid cut-off means in only one of the two pipe-end fittings with a lift valve being opened automatically when the coupling is applied the valve having an axial bore communicating with lateral apertures

Definitions

• the present invention relates to a connection unit for a fast-coupling safety joint, which can connect in a fluid-tight manner to one another two distribution pipes for a pressurised operative fluid, and in particular air or compressed gas .
• Fast-coupling joints without the safety function which substantially comprise a connection unit which can be connected to a first one of said distribution pipes, and a terminal which can be connected to a second one of said distribution pipes , and can be connected such that it can be released, inside the connection unit in a coupling position.
• the connection unit comprises a main, hollow body which can be connected to the first pipe, a slide-valve element which is mounted axially such as to slide inside the main body, a cylindrical, helical spring which is interposed between the main body and the valve element, and can exert axial thrust on the valve element itself, in order to maintain it in a first operative position, of sealed separation of the first pipe from the outer environment , and releasable stop means , in order to constrain the terminal against the connection unit in the coupling position, in which the terminal exerts on the valve element thrust, which is opposite and prevalent relative to the thrust exerted by the spring, and thus maintains the valve element itself in a second operative position of opening of the fluid connection between the first and the second pipe .
• first and second releasable stop means which are disposed axially spaced from one another.
• the first stop means can cooperate with the terminal in order to lock it in the coupling position
• the second stop means can cooperate with the terminal in order to retain it , after release of the first stop means and during the step of disconnection from the connection unit, in a withdrawn, safety position, in which the terminal itself is mechanically connected to the main body, and the valve element is disposed in the first operative position, in which it isolates the first pipe in a fluid-tight manner, and permits drawing towards the exterior of the operative fluid which is present inside the joint, beyond the first pipe, towards the second pipe.
• These stop means generally consist of mobile engagement elements, which can be deactivated manually from the exterior, project inside the main body, and can cooperate with a retention groove provided on a radially external surface of the terminal .
• connection units of the above-described type make it impossible to use the standard terminals which are available on the market, which are provided with an annular retention groove with a short axial length, and are normally used in fast-coupling joints which do not have a safety function.
• the object of the present invention is to provide a connection unit for a fast-coupling safety joint, which is suitable for being fitted with the standard terminals which are available on the market, and are normally used in fast-coupling joints which do not have a safety function.
• connection unit which can be connected to a first distribution pipe for a pressurised operative fluid, and can be connected such that it can be released, to a terminal of a second distribution pipe for said operative fluid, in order to form a fast-coupling safety joint
• said connection unit having a longitudinal axis, and comprising: a main, hollow body which can be connected to said first pipe; a slide valve element, mounted such that it can slide axially inside said main body; first resilient means, which exert axial thrust on said valve element, in order to maintain it in a first operative position, in which said valve element separates said first pipe from the external environment in a fluid- tight manner; first releasable stop means , which in use define an advanced coupling position of said terminal inside said connection unit , in which said terminal exerts on said valve element thrust, which is opposite and prevalent relative to the thrust exerted by said first resilient means, and maintains the valve element itself in a second operative position, of opening of
• connection unit can accept a great variety of terminal profiles, which must simply be provided with an annular groove with a short axial length, of the type normally fitted on the standard terminals which are available on the market, and are used in fast-coupling joints which do not have a safety function.
• Said first stop means preferably comprise first, manually actuated selection means, in order to command release of said connection means, and said second stop means comprise second, manually actuated selection means, in order to command release of said constraint means, said connection unit comprising means to inhibit actuation of said second selection means, which are active in the coupling position of said terminal, and can be deactivated after actuation of said first selection means .
• figure 1 illustrates in axial cross-section a fast- coupling safety joint, which is provided with a connection unit according to the present invention, and a terminal which is connected to the connection unit itself in a coupling position
• figure 2 is a cross-section on an enlarged scale according to line II-II in figure 1
• figure 3 illustrates in axial cross-section the connection unit and the terminal in figure 1, disconnected from one another
• figure 4 illustrates in axial cross-section the joint in figure 1, in a safety configuration
• figures 5-7 illustrate a lateral view of the joint in figure 1, during successive steps of a manoeuvre of disconnection of the terminal from the connection unit
• figure 8 illustrates a lateral view of a different embodiment of a connection unit for a fast-coupling safety joint according to the present invention, connected to a corresponding terminal in a coupling position
• figure 9 is a cross-section according to
• 1 indicates as a whole a fast-coupling safety joint for fluid-tight connection to one another of two pipes 2, 3, for distribution of a pressurised operative fluid (figure 1), in particular air or compressed gas.
• the joint 1 has a longitudinal axis A, and comprises a connection unit 4, produced according to the present invention, and suitable for being connected to the pipe 2, and a terminal 5 (which is of a known type and is not part of the present invention) , which is connected to the pipe 3 , and can be connected such that it can be released, to the connection unit 4.
• the terminal 5 has a substantially tubular shape with an axis A, and comprises a main, cylindrical portion 6, which in use is connected to the pipe 3 , and has on its exterior an annular retention groove 7, and a free end portion 8, which has a diameter which is smaller than the portion 6, and is connected to the portion 6 itself.
• connection unit 4 comprises a main, hollow body 10 which is substantially cylindrical, and can be connected at one of its own ends to the pipe 2; a slide valve element 11, which is mounted axially such that it can slide inside the body 10, and defines with the body 10 itself a substantially cylindrical chamber 12, which in use communicates with the pipe 2; a cylindrical, helical spring 13 with an axis A, which is accommodated in the chamber 12 and can exert axial thrust on the valve element 11, in order to maintain it in a first operative position (figures 3 and 4) , in which the valve element 11 itself abuts a radially inner annular projection 14 of the body 10, and separates the chamber 12 and the pipe 2 in a fluid-tight manner from the external environment; in use a first releasable stop mechanism 15 , defines an advanced, coupling position (figures 1 and 5) of the terminal 5 inside the connection unit 4, in which the terminal 5 itself exerts on the valve element 11 thrust, which is opposite and prevalent relative to the thrust
• the stop mechanism 15 comprises releasable connection means 17, between the body 10 and the valve element 11, and the stop mechanism 16 comprises releasable constraint means 18, which are supported by the valve element 11, and can cooperate with the groove 7 of the terminal 5, in order to render the terminal 5 itself integral with the valve element 11, between the withdrawn, safety position and the advanced, coupling position.
• the body 10 consists of a pair of substantially tubular elements 19, 20 with an axis A, which are screwed to one another.
• the element 19 is substantially in the shape of a beaker, and comprises two substantially cylindrical portions 21, 22 with different diameters, which are connected to one another by a substantially circular intermediate wall 23 , and can be connected respectively to the element 20 and to the pipe 2.
• the portion 21 has a diameter which is larger than the diameter of the portion 22, and is threaded internally; in addition, the wall 23 has a central through hole 24 with an axis A, in order to permit in use passage of the operative fluid from the pipe 2 to the chamber 12.
• the element 20 has a substantially cylindrical shape, an end portion 25 which is threaded externally and is engaged inside the portion 21 of the element 19, and is integral with the projection 14; in particular, the projection 14 has a cylindrical surface 26 with an axis A, which defines a sliding seat for the valve element 11, and is delimited towards the wall 23 by a frusto-conical surface 27 with an axis A, with concavity which faces the wall 23 itself, and on the opposite side is delimited by a circular surface 28, which also has an axis A.
• the chamber 12 is thus delimited by the wall 23 , by the portions 21, 25 of the body 10 screwed together, by the surface 27 of the projection 14, and by the valve element 11.
• valve element 11 has an elongate cup shape with an axis A, and is defined by a wall 29 with a substantially circular base, and by a lateral wall 30 which consists of a plurality of substantially cylindrical portions 33, 34, 35, with an outer diameter which decreases towards the wall 29 itself; the walls 29 and 30 also delimit a cavity 36.
• the wall 29 is provided externally with a sealing ring 38 with an axis A, which, in the first operative position of the valve element 11, abuts the surface 27 of the projection 14, separating the chamber 12 and the pipe 2 in a fluid-tight manner from the cavity 36, and thus from the external environment.
• the wall 29 also has an axial seat substantially in the shape of a cup, which faces towards the interior of the chamber 12, and is engaged by a corresponding end of the spring 13 , the other end of which is engaged inside a similar seat provided in the wall 23 of the element 19.
• the portion 35 is adjacent to the wall 29, and has an outer diameter which is substantially the same as the outer diameter of the wall 29 itself; in addition, the portion 35 is engaged in an axially sliding manner inside the cylindrical surface 26 of the projection 14, and has a cylindrical section 41 which is adjacent to the portion 34, and has an outer diameter which is substantially the same as the outer diameter of the wall 29, a bladed section 42 with an outer diameter which is smaller than the outer diameter of the wall 29 itself, and in the second operative position of the valve element 11 can permit fluid connection between the chamber 12 and the cavity 36, and a lowered intermediate section 43 which connects the sections 41 and 42.
• a sealing ring 44 which is engaged in a corresponding annular groove provided in the surface 26.
• the ring 44 In the first operative position of the valve element 11, the ring 44 is positioned between the projection 14 and the lowered section 43 of the portion 35, such as to permit drawing of operative fluid from the cavity 36 towards the exterior, whereas in the second operative position of the valve element 11, the ring 44 is compressed between the projection 14 and the section 41 of the portion 35, such as to ensure sealing between the body 10 and the valve element 11 itself.
• the portion 34 is disposed adjacent to the portion 35, engaged in an axially sliding manner inside an end portion 45 of the element 20 of the body 10, opposite the portion 25, and defines internally an annular shoulder 46, the function of which will be explained hereinafter.
• the portion 33 is disposed on the side opposite the portion 34, relative to the portion 35, has a length which is longer than the portions 34, 35 themselves, extends outside the body 10, and ends in a radially annular flange 47, which projects towards the exterior.
• the valve element 11 is also provided integrally with a cylindrical rod 48 with an axis A, which extends inside the cavity 36 of the wall 29, as far as the connection area of the portions 33 and 34 of the wall 30.
• the constraint means 18 comprise a plurality of spheres 50, which are accommodated in a sliding manner in respective radial through seats 51 provided in the portion 45 of the element 20 of the body 10, are regularly distributed around the axis A, and are mobile between a position of engagement with the groove 7 of the terminal 5 , in which they form a mechanical connection between the valve element 11 and the terminal 5 itself, and a position of disengagement from the groove 7.
• the stop mechanism 16 additionally comprises a manually actuated selection ferrule 52 with an axis A, which is mounted such as to slide axially along a radially outer surface of the portion 33 of the valve element 11, and can command displacement of the spheres 50 from the position of engagement to the position of disengagement, and thus can give rise to disconnection of the terminal 5 from the valve element 11, and a retention element 53, which is mounted such as to slide axially inside the portion 33 of the valve element 11, can be engaged in use by the end portion 8 of the terminal 5, and, when it is disconnected from the terminal 5 itself, can be disposed in a position of internal closure of the seats 51 of the spheres 50.
• a manually actuated selection ferrule 52 with an axis A which is mounted such as to slide axially along a radially outer surface of the portion 33 of the valve element 11, and can command displacement of the spheres 50 from the position of engagement to the position of disengagement, and thus can give rise to disconnection of the terminal 5 from the valve element 11, and a retention element
• the spheres 50 have a diameter which is larger than the radial dimension of the respective seats 51, and thus, in the engagement position, project radially inside the portion 33 of the valve element 11, and engage the groove 7 of the terminal 5, whereas in the position of disengagement, they are disposed such that they abut the retention element 53 radially, and consequently project radially outside the valve element 11 itself.
• the selection ferrule 52 has an annular groove 54 , which can be engaged by the spheres 50, when the latter are disengaged from the groove 7 of the terminal 5, and is loaded by a cylindrical helical spring 55 with an axis A, which is wound around the portion 33 itself; more specifically, the spring 55 is interposed between one end 76 of the selection ferrule 52, opposite the flange 47, and a resilient ring 56 which is fitted on the exterior of the portion 33, in the vicinity of the portion 45 of the element 20 of the body 10.
• the selection ferrule 52 In its own position of engagement with the groove 7, the selection ferrule 52 is thrust by the spring 55 against the flange 47, whereas, in their own position of disengagement from the groove 7, the spheres 50 keep the selection ferrule 52 axially spaced from the flange 47 itself .
• the retention element 53 consists of a cylindrical cup tubular portion 57, engaged in an axially sliding manner inside the portion 33 of the valve element 11, and by a rim portion 60, which extends in a projecting manner from a base wall of the portion 56 which faces the shoulder 46, and is engaged in a sliding manner along the outer surface of the rod 48.
• a sealing ring 61 which is accommodated in a corresponding annular groove provided on a radially inner surface of the portion 33 itself.
• the portion 60 comprises a pair of elongate arms 62 (figure 2) , which are disposed facing one another, and extend axially in a projecting manner on diametrically opposite parts of the base wall of the portion 57, relative to the axis A, and a connection element 63 which is transverse relative to the axis A, connecting the free ends of the arms 62 , and having a through hole 63a which is engaged in a sliding manner by the rod 48.
• the retention element 53 is loaded by a cylindrical helical spring 64 with an axis A, which extends between the portion 57 and the shoulder 46 of the portion 34 of the valve element 11; on a free end of the rod 48, there is also mounted a resilient ring 65, which is interposed between the arms 62, and cooperates with the lateral edge of the hole 63a of the connection element 63, in order to prevent extraction of the retention element 53 from the cavity 36 of the valve element 11, and thus from the connection unit 4, in the direction opposite the wall 29.
• the portion 57 of the retention element 53 can be engaged in use, by means of interposition of a sealing ring 66, by the portion 8 of the terminal 5, which, during the step of introduction inside the cavity 36 of the valve element 11, can exert on the retention element 53 axial thrust, which is opposite and prevalent relative to the thrust of the spring 64 , in order to displace the retention element itself axially towards the wall 29, and release the spheres 50, such as to permit subsequent engagement with the groove 7; more particularly, the ring 66 is accommodated in a corresponding annular groove provided on a radially inner surface of the lateral wall of the portion 57 of the retention element 53.
• connection means 17 comprise a plurality of spheres 67, which are accommodated in a sliding manner in respective radial through seats 68 provided in the portion 45 of the element 20, are regularly distributed around the axis A, and are mobile between a connection position, in which they engage an annular groove 69 provided in the radially outer surface of the portion 34 , and define the second operative position of the valve element 11, and thus the position of engagement of the terminal 5, and a release position, in which they are disconnected from the groove 69 itself.
• the stop mechanism 15 additionally comprises a manually actuated selection ferrule 70 with an axis A, which is mounted such as to slide axially along respective radially outer surfaces of the body 4 and of the selection ferrule 52, and can command displacement of the spheres 67 from the position of connection to the position of release, and thus can give rise to displacement of the valve element 11 from the second to the first operative position.
• a manually actuated selection ferrule 70 with an axis A which is mounted such as to slide axially along respective radially outer surfaces of the body 4 and of the selection ferrule 52, and can command displacement of the spheres 67 from the position of connection to the position of release, and thus can give rise to displacement of the valve element 11 from the second to the first operative position.
• the spheres 67 have a diameter which is larger than the radial dimension of the respective seats 68, and thus in the connection position, they project radially inside the element 20 of the body 10, and engage the groove 69 of the valve element 11, whereas in the disconnection position, they are disposed such that they abut radially a cylindrical section of the portion 34 of the valve element 11 adjacent to the groove 69, and thus project radially outside the element 20 itself .
• the selection ferrule 70 has an annular groove 71 which can be engaged by the spheres 67 when the latter are disconnected from the groove 69, and loaded by a cylindrical helical spring 72 with an axis A, which is wound around the element 20 of the body 10, and is interposed between a radially outer projection 73 of the element 20, and a first inner shoulder of the selection ferrule 70 itself.
• the selection ferrule 70 has an end portion 75, which, owing to the effect of the thrust of the spring 72, and in the position of coupling of the terminal 5, can be disposed such that it covers completely the selection ferrule 52, such as to prevent the latter from being actuated before the selection ferrule 70 itself is actuated, and thus by-passing the safety function of the joint 1.
• the selection ferrule 70 in the position of connection of the spheres 67 to the groove 69, the selection ferrule 70 is thrust by the spring 72, such that its own second inner shoulder abuts the end 76 of the selection ferrule 52, which in turn abuts the flanges 47, and covers the ferrule 52 itself with its own portion 75, whereas in the position of disconnection of the spheres 67 from the groove 69, the selection ferrule 70 is axially spaced from the flange 47.
• the terminal 5 is connected to the connection unit 4 by means of single manoeuvre of insertion of the terminal
• the selection ferrule 52 is thrust against the flange 47.
• the valve element 11, which continues to thrust the terminal 5 axially inside the connection unit 4 moves integrally with the terminal 5 itself from the first operative position towards the second operative position, giving rise to compression of the spring 13, and gradually moving the ring 38 away from the surface 27 of the projection 14, such as to put the chamber 12 into communication with the cavity 36, via the bladed section 42 of the valve element 11.
• the operative fluid which comes from the pipe 2 passes through the bladed section 42, which is disposed such as to project inside the chamber 12, and flows into the terminal 5 , and thus into the pipe 3 , passing through the cavity 36 and the rim portion 60 of the retention element 53.
• the rings 38, 44, 61 and 66 ensure that the joint 1 is perfectly sealed from the interior towards the exterior.
• the terminal 5 is disconnected from the connection unit 4 by acting separately and in succession on the selection ferrules 70 and 52.
• the ferrule 52 is inaccessible, since it is fully covered by the end portion 75 of the selection ferrule 70 (figures 1 and 5) .
• the selection ferrule 70 must be displaced axially towards the pipe 2, until the groove 71 is in the position of the spheres 67; at this point, owing to the effect of the thrust of the spring 13 and of the pressurised fluid, the spheres 67 slide inside the corresponding seats 68, and are thrust into engagement with the groove 71 itself, thus releasing the valve element 11, which is displaced from the second to the first operative position, in which, by means of the contact of the ring 38 with the surface 27 of the projection 14, it separates in a sealed manner the chamber 12 , and thus the pipe 2 , from the remaining part of the joint 1.
• the terminal 5 is still connected to the valve element 11, by means of the engagement of the spheres 50 in the groove 7 (figures 4 and 6) .
• the ring 44 is positioned between the lowered section 43 of the valve element 11 and the surface 26 of the projection 14 of the body 10, thus allowing the operative fluid which is contained between the projection 14 itself and the pipe 3 to be drawn towards the exterior.
• 1' indicates as a whole a fast- coupling safety joint, which comprises a connection unit 4 ' , produced according to a different embodiment of the present invention; this connection unit is described hereinafter only to the extent that it differs from the connection unit 4, and the same reference numbers indicate parts which are the same as, or correspond to, parts which have already been described.
• the connection unit 4 ' comprises a stop mechanism 15 ' , which differs from the stop mechanism 15 in that instead of the selection ferrule 70 and the spheres 67, it comprises a trigger element 80, which is supported by the element 20 of the body 10, and is mobile in the direction at right-angles to the axis A, inside a corresponding seat 81 of the element 20 itself, between a connection position (figures 8 and 9) , in which it cooperates in engagement with the groove 69 of the valve element 11, thus defining the second operative position of the latter, and therefore the position of coupling of the terminal 5, and a release position (figures 10 and 11) , in which it is disconnected from the groove 69 itself.
• the trigger element 80 comprises a ring portion 82, which is accommodated in a sliding manner in the seat 81, and is mounted with radial play on the exterior of the portion 34 of the lateral wall 30 of the valve element 11, and an actuation portion 83, which has a substantially rectangular profile, and extends in a projecting manner from the ring portion 82, which is accommodated in a recess 84 in the element 20 of the body 10, which communicates with the seat 81.
• the trigger element 80 is loaded in the direction at right-angles to the axis A by a spring 85, which is interposed between an end surface of the recess 84 and the actuation portion 83, such that the ring portion 82 is kept continually in contact with the outer surface of the portion 34 of the valve element 11, on the side which is diametrically opposite the actuation portion 83 itself .
• the stop mechanism 16 comprises a selection ferrule 86, which is similar to the ferrule 52, and differs from the latter in that it has a larger size, and comprises a first portion 87, which corresponds entirely to the ferrule 52, and cooperates in a sliding manner with an outer surface of the portion 35 of the wall 30 of the valve element 11, and a second portion 88, which cooperates in a sliding manner with an outer surface of the element 20 of the body 10.
• the portion 88 of the ferrule 86 also has a through slot 89, with a substantially rectangular profile, which can be engaged, by means of the thrust of the spring 85, by the actuation portion 83 of the trigger element 80, in the position of connection of the latter with the groove 69 of the valve element 11, corresponding to the position of coupling of the terminal 5; by this means, the selection ferrule 86 is prevented from being actuated before the trigger element 80 is displaced into the release position, by this means by-passing the safety function of the joint 1'.
• the portion 87 of the ferrule 86 is provided with the annular groove 54 , which can be engaged by the spheres 50, and is loaded by the spring 55, which, instead of the ring 56, cooperates with a projection 93, which extends integrally from the portion 35 of the wall 30 of the valve element 11.
• the ferrule 86 In its own position of engagement with the groove 7 of the terminal 5, the ferrule 86 is thrust by the spring 55 against a ring 92, which is mounted externally on a free end of the portion 35 of the valve element 11, and to all effects replaces the flange 47.
• the ring portion 82 of the trigger element 80 cooperates with the portion 34 of the wall 30 of the valve element 11, and has dimensions together with the latter, such that the outer surface of the actuation portion 83 is disposed perfectly in line with the outer surface of the element 20 of the body 10, in the vicinity of the recess 84, in order to permit axial sliding of the ferrule 86 relative to the body 10 itself.
• the element 20 of the body 10 is provided externally in a projecting manner with a radial peg 90, which cooperates in a sliding manner with a longitudinal groove 91 of the ferrule 86, and has the function of keeping the ferrule 86 itself in a pre-determined angular position relative to the axis A, such that the slot 89 is always aligned with the actuation portion 83 of the trigger element 80.
• the assembly of the joint l 1 is altogether similar to the assembly of the joint 1, and is also described on the basis of an initial configuration (figure 10) in which the terminal 5 is disconnected from the connection unit 4 ' , the valve element 11 is disposed in its own first operative position, the trigger element 80 is disposed in its own release position, and the retention element 53 is thrust by the spring 64 in the direction opposite the wall 29, and forms a radial stop for the spheres 50, which are thus disposed in the position of disengagement, and also keep the selection ferrule 86 axially spaced from the ring 92.
• the terminal 5 is connected to the connection unit 4 by means of a single manoeuvre of insertion of the terminal 5 itself inside the cavity 36 of the valve element 11.
• valve element 11 which continues to thrust the terminal 5 axially inside the connection unit 4, is displaced integrally with the terminal 5 itself, from the first operative position towards the second operative position, thus giving rise to compression of the spring 13, and gradually moving the ring 38 away from the surface 27 of the projection 14, such as to put the chamber 12 into communication with the cavity 36, via the bladed section 42 of the valve element 11. Owing to the presence of the ring 92, the ferrule 86 is also displaced integrally with the valve element 11.
• the trigger element 80 slides in the seat 81, and is thrust into the position of connection with the groove 69 itself, thus locking the valve element 11 in the second operative position, in which it opens the fluid connection between the pipes 2 and 3 , and defines the advanced position of coupling of the terminal 5 inside the connection unit 4 (figures 8 and 9) ; in this position, the actuation portion 83 of the trigger element 80 engages the slot 89.
• the terminal 5 is disconnected from the connection unit 4 ' by acting separately and in succession on the trigger element 80 and on the selection ferrule 86.
• the ferrule 86 cannot be displaced axially, since the actuation portion 83 of the trigger element 80 engages the slot 89 (figures 8 and 9) .
• the ring 44 is positioned between the lowered section 43 of the valve element 11, and the surface 26 of the projection 14 of the body 10, thus allowing the operative fluid which is contained between the projection 14 itself and the pipe 3 to be drawn towards the exterior.
• connection units , 4 ' produced according to the present invention, without departing from the scope of protection of the claims .

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Quick-Acting Or Multi-Walled Pipe Joints (AREA)

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Cited By (1)

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• 1997
  • 1997-10-10 IT IT97TO000900A patent/IT1295712B1/it active IP Right Grant
• 1998
  • 1998-10-09 AU AU96436/98A patent/AU9643698A/en not_active Abandoned
  • 1998-10-09 WO PCT/IT1998/000269 patent/WO1999019657A1/en not_active Application Discontinuation
  • 1998-10-09 EP EP98950295A patent/EP0943066A1/en not_active Withdrawn

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