EP2048438A2 - Drain cock with built-in pressure regulator, particularly for wall-mounted boilers and the like - Google Patents
Drain cock with built-in pressure regulator, particularly for wall-mounted boilers and the like Download PDFInfo
- Publication number
- EP2048438A2 EP2048438A2 EP08160018A EP08160018A EP2048438A2 EP 2048438 A2 EP2048438 A2 EP 2048438A2 EP 08160018 A EP08160018 A EP 08160018A EP 08160018 A EP08160018 A EP 08160018A EP 2048438 A2 EP2048438 A2 EP 2048438A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- opening
- barrier
- closing member
- seat
- drain cock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000004888 barrier function Effects 0.000 claims abstract description 45
- 238000009434 installation Methods 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 17
- 241001274197 Scatophagus argus Species 0.000 abstract 1
- 239000004606 Fillers/Extenders Substances 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013536 elastomeric material Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves
- F22B37/446—Safety devices responsive to overpressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/50—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers for draining or expelling water
Definitions
- the present invention relates to a drain cock for a plumbed installation, particularly a wall-mounted boiler or the like.
- the invention relates to a drain cock comprising
- a drain cock of the type specified above characterized in that it comprises a moveable barrier separated from the opening and closing member and stressed by associated elastic means towards a shutoff position in which it is able, when said member is in the closed position, to prevent the passage of liquid between said pipe of the body and a discharge passage; the arrangement being such that the barrier is able to move from said shutoff position, against the action of said elastic means, when the pressure of fluid upstream of the valve seat exceeds a predetermined value, to a position in which it allows fluid to be discharged from the portion of the installation upstream of said valve seat to the aforesaid discharge passage.
- the drain cock according to the invention is also able to perform the function of a true pressure regulator.
- a drain cock 1 for a plumbed installation particularly a wall-mounted boiler in a domestic heating system, comprises a body 2.
- This body is designed to be connected, or even built into, the installation in question, or into the body of the boiler to which it is connected.
- the body 2 contains an internal liquid-carrying pipe 3 that leads to a valve seat marked 4.
- the drain cock 1 also comprises a hand-actuated opening and closing member 6 that is connected disconnectably to a matching formation of the body 2.
- the opening and closing member 6 is connected disconnectably to the body 2.
- the member 6 is of essentially tubular shape and includes an intermediate portion 6a which is externally threaded and is screwed into the correspondingly threaded portion 5b of the passage 5 of the body 2.
- the actuating member 6 has a bottom end portion 6b, likewise essentially tubular, of enlarged diameter.
- the periphery of this portion 6b of the member 6 is preferably provided with a plurality of ridges 7 to facilitate grasping it and turning it by hand.
- this fitting 8 Connected to the bottom portion 6b of the actuating member 6 by for example a snap fastening, is a tubular fitting 8.
- this fitting 8 has a top axial portion 8a of relatively larger diameter inserted into the portion 6b of the actuating member 6 with an interposed sealing ring 9.
- the fitting 8 has a reduced-diameter bottom portion 8b onto which a drain tube 10 can be engaged.
- This may for example be a flexible tube.
- the opening and closing member 6 and the associated fitting 8 may conveniently each be made as a separate single plastic moulding.
- the fitting 8 includes an integral cross-shaped configuration 11 which, without obstructing the passage of fluid through this fitting, acts as a lower reaction element for a helical spring marked 12.
- the opening and closing member 6 has a top axial portion 6c in which an external annular groove 13 is made to house an O-ring seal 14 which presses against the smooth wall of the portion 5a of the passage 5 of the body 2.
- annular stop ridge marked 6d is defined inside the opening and closing member 6, at the junction between its bottom portion 6b and its intermediate portion 6a.
- Reference 15 in Figure 1 is a general reference for a barrier assembly which in the embodiment illustrated comprises an essentially tubular body 16 mounted so as to be axially moveable in the internal passage 6e defined inside the intermediate portion 6a and inside the top end portion 6c of the opening and closing member 6.
- the tubular body 16 ends at the top in the form of a head 17 which supports, around a mushroom-shaped configuration 18, an annular seal 19, of elastomeric material for example, designed to operate as the actual barrier by acting on the valve seat 4 of the body 2.
- a plurality of openings 20 are formed in the wall of the tubular body 16 through which the region located in the portion 5a of the passage 5, above the sealing ring 14, communicates with the axial passage 16a of the aforesaid body 16.
- the helical spring 12 extends partially into the tubular element 16 of the barrier assembly 15 and reacts at its top end against an internal shoulder of this tubular element.
- Reference 21 is an external ring mounted on the lower end of the tubular element 16 to face the annular stop configuration 6d on the opening and closing member 6.
- the latter In normal operation of the plumbed installation to which the drain cock 1 is fitted, the latter is also able to perform the pressure regulating function: if the pressure of the fluid upstream of the valve seat 4 exceeds a predetermined threshold, whose value depends on the characteristics of the spring 12, the entire barrier assembly 15 moves translationally downwards against the action of said spring, allowing a partial drainage of fluid from the pipe 3 to the drain tube 10.
- Figure 2 shows a variant of the fitting 8.
- the bottom portion 8b of this fitting is inserted into a tubular extender 22.
- This extender has a top portion 22a slid leaktightly into the bottom portion of the fitting 8, and a bottom portion 22b or nipple onto which the drain tube 10 can be force fitted.
- a clip 23 or split pin prevents the extender 22 being pulled out of the fitting 8.
- the extender is however able to execute a limited axial translational stroke relative to the fitting 8.
- a spring 24 is inserted between the portion 22a of the extender 22 and an internal shoulder of the portion 8b of the fitting 8. The action of this spring is to tend to keep the extender 22 in the position illustrated in Figure 2 , where its top portion 22a is pressed against the clip 23.
- the extender 22 has a projecting intermediate configuration 22c of for example hexagonal shape for operation by a spanner or the like when the extender 22 and the tube 10 connected to it are to be turned.
- FIGS 3 to 5 show a variant of a drain cock with built-in pressure regulator according to the present invention.
- parts and components corresponding functionally to parts and components already described are given the same reference numbers as before.
- the drain cock 1 comprises a body 2 which is essentially of "male” type, and has an externally threaded intermediate portion 5b.
- the hand-actuated opening and closing member 6 is of "female" type and has an internally threaded end portion 6a for screwing onto the portion 5b of the body 2.
- the opening and closing member 6 has a bottom portion 6b, connected to the bottom end of which is an extender 8 onto which the drain tube 10 is pushed.
- Figure 3 also shows, at 14, an O-ring seal inserted between the body 2 and the opening and closing member 6.
- this ring 14 is however placed in an annular groove in the bottom part of the body 2.
- annular transverse shoulder 25 which defines a central opening or passage 26.
- annular seal 27 made for example of an elastomeric material, which looks essentially C-shaped in transverse section.
- a plurality of through openings 28 which are radially external to the sealing ring 27 are defined in the annular shoulder 25 of the member 6. The function of the openings 28 will be described below.
- a barrier assembly 15 is mounted moveably inside the opening and closing member 6 and consists, in the example illustrated, of a simple cup-shaped member 16 held in place by the helical spring 12 in engagement with the bottom portion or underside 27b of the sealing ring 27.
- a plurality of longitudinal ribs 29 are conveniently formed in the portion 6b of the member 6, beneath the annular shoulder 25, to guide the axial movement of the body 16.
- the cock 1 described above is in the condition shown in Figure 3 . If the pressure in the installation to which the cock 1 is fitted rises too high, this cock can act as a pressure regulator. What happens is that the pressure of the fluid acts on the top surface of the barrier member 16, pushing it away from the sealing ring 27, in opposition to the reaction of the spring 12, which is correspondingly compressed. A quantity of liquid can then be drained out through the passages 30 defined between the side skirt of the barrier member 16 and the guide ribs 29 ( Figure 5 ).
- the member 6 When used as a drain cock, the member 6 is unscrewed manually from the body 2 in such a way that the sealing ring 27 comes away from the valve seat 4. Consequently, although the barrier member 16 remains in engagement with the underside of the sealing ring 27, a quantity of liquid can flow from the pipe 3 to the drain tube 10, passing through the openings 28 in the shoulder 25 and the passages 30 defined between the guide ribs 29 of the member 6.
- fitting member 8 may be modified to the version shown in Figure 2 .
- Figure 6 shows another variant of a drain cock according to the present invention.
- certain parts or components corresponding to parts and components already described have again been given the same reference numbers as before.
- the drain cock 1 comprises a body 2 designed to be connected to or even built into the use installation, or into the body of the boiler to which it is fitted.
- a pipe 3 which leads to a first valve seat 4, shown by the edge of an opening formed in a side wall of the pipe 3. This pipe also leads to another valve seat, marked 33.
- the cock 1 in Figure 6 again includes a hand-actuated opening and closing member 6 connected disconnectably to a matching configuration of the body 2.
- the body 2 forms a tubular projection in which is defined a passage 5, downstream of the valve seat 4.
- This tubular portion of the body 2 has an external thread 5b on which the internally threaded opening and closing member 6 is screwed.
- An essentially cylindrical rod 34 with a peripheral sealing ring 35 which engages with the surface of the passage 5 is coaxially fixed to the member 6.
- the distal end 34a of the rod 34 carries an annular sealing ring which forms the barrier 19 acting on the valve seat 4.
- the passage 5 communicates with a chamber 36 formed in the body 2 around the valve seat 33.
- the chamber 36 communicates with the drain pipe 32 formed in a tubular projection of the body 2.
- Reference 31 in Figure 6 is a diaphragm barrier, its perimeter being clamped between the body 2 and an associated body 2' which is screwed onto the latter.
- the diaphragm barrier 31 is connected to an end portion or head 37a of a moveable body marked by the general reference 37.
- a spring 12 tends to push the body 37 down in such a way as to keep the central portion of the diaphragm barrier 31 engaged on the valve seat 33. In this condition the inlet passage 3 is disconnected from the drain passage 32 because of the closure of the valve seat 4 by the barrier 19 and because of the closure of the valve seat 33 by the diaphragm barrier 31.
- the passage 3 is able to communicate with the drain pipe 32 through the chamber 36 due to the separation of the barrier 19 from the opening or valve seat 4. In this condition, however, the diaphragm barrier 31 remains engaged on the valve seat 33.
- Figure 7 shows a variant of the drain cock of Figure 6 . Nonetheless, the same reference numbers are used in Figure 7 as before to define parts/components identical or substantially equivalent to parts/components already described.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
- Lift Valve (AREA)
- Mechanically-Actuated Valves (AREA)
- Building Environments (AREA)
Abstract
a body (2) with a pipe (3) that leads to a valve seat (4),
a hand-actuated opening and closing member (6) screwed onto a formation (5b) on the body (2),
barrier members (15, 16, 19; 15, 16, 27; 19) connected to the opening and closing member (6) and able to act on the valve seat (4), in such a way that when said member (6) is, relative to the body (2), in a closed position and in an open position, respectively, these barrier members shut off and disengage from, respectively, the seat (4), preventing and permitting, respectively, communication between an upstream portion of the installation and a region downstream of the valve scat (4).
Description
- The present invention relates to a drain cock for a plumbed installation, particularly a wall-mounted boiler or the like.
- More specifically the invention relates to a drain cock comprising
- a body designed to be connected to or built into said installation and having a plumbed pipe that leads to a valve seat;
- a hand-actuated opening and closing member connected disconnectably to a matching formation on said body, particularly by a threaded connection, and
- barrier means connected to said opening and closing member and able to act on said valve seat, in such a way that when said member is, relative to the body, in a closed position and in an open position, respectively, the barrier means shut off and disengage from, respectively, said valve seat, preventing and permitting, respectively, communication between an upstream portion of the installation and a region downstream of said valve seat.
- It is an object of the present invention to provide an improved drain cock.
- These and other objects are achieved according to the invention with a drain cock of the type specified above, characterized in that it comprises a moveable barrier separated from the opening and closing member and stressed by associated elastic means towards a shutoff position in which it is able, when said member is in the closed position, to prevent the passage of liquid between said pipe of the body and a discharge passage;
the arrangement being such that the barrier is able to move from said shutoff position, against the action of said elastic means, when the pressure of fluid upstream of the valve seat exceeds a predetermined value, to a position in which it allows fluid to be discharged from the portion of the installation upstream of said valve seat to the aforesaid discharge passage. - By means of these features, the drain cock according to the invention is also able to perform the function of a true pressure regulator.
- It therefore greatly simplifies the structure and assembly of the plumbed installation in which it is used.
- Other features and advantages of the invention will be made clear by the following detailed description, which is given purely by way of non-restrictive example, with reference to the appended drawings, in which:
-
Figure 1 is a cross section through a first drain cock according to the present invention; -
Figure 2 is a cross section through a variant of part of the drain cock according toFigure 1 ; -
Figure 3 is a cross section through a second embodiment of a drain cock according to the invention; -
Figures 4 and 5 are cross sections taken on IV-IV and V-V, respectively, as marked inFigure 3 ; -
Figure 6 is a cross section through another embodiment of a drain cock according to the invention; and -
Figure 7 is a cross section through a variant of the drain cock according toFigure 6 . - With reference to
Figure 1 , a drain cock 1 for a plumbed installation, particularly a wall-mounted boiler in a domestic heating system, comprises abody 2. This body is designed to be connected, or even built into, the installation in question, or into the body of the boiler to which it is connected. - The
body 2 contains an internal liquid-carryingpipe 3 that leads to a valve seat marked 4. - The drain cock 1 also comprises a hand-actuated opening and closing
member 6 that is connected disconnectably to a matching formation of thebody 2. - In the embodiment shown in
Figure 1 , downstream of thevalve seat 4, there is defined in the body 2 apassage 5 having a smooth-walledupper portion 5a and alower portion 5b whose wall is threaded. Thisportion 5b of thepassage 5 opens at the bottom outside thebody 2. - The opening and closing
member 6 is connected disconnectably to thebody 2. In the embodiment depicted, themember 6 is of essentially tubular shape and includes anintermediate portion 6a which is externally threaded and is screwed into the correspondingly threadedportion 5b of thepassage 5 of thebody 2. - The actuating
member 6 has abottom end portion 6b, likewise essentially tubular, of enlarged diameter. The periphery of thisportion 6b of themember 6 is preferably provided with a plurality ofridges 7 to facilitate grasping it and turning it by hand. - Connected to the
bottom portion 6b of the actuatingmember 6 by for example a snap fastening, is atubular fitting 8. In the embodiment illustrated, thisfitting 8 has a topaxial portion 8a of relatively larger diameter inserted into theportion 6b of the actuatingmember 6 with an interposedsealing ring 9. - The
fitting 8 has a reduced-diameter bottom portion 8b onto which adrain tube 10 can be engaged. This may for example be a flexible tube. - The opening and
closing member 6 and the associatedfitting 8 may conveniently each be made as a separate single plastic moulding. - In the embodiment illustrated, the
fitting 8 includes anintegral cross-shaped configuration 11 which, without obstructing the passage of fluid through this fitting, acts as a lower reaction element for a helical spring marked 12. - The opening and closing
member 6 has a topaxial portion 6c in which an externalannular groove 13 is made to house an O-ring seal 14 which presses against the smooth wall of theportion 5a of thepassage 5 of thebody 2. - Inside the opening and closing
member 6, at the junction between itsbottom portion 6b and itsintermediate portion 6a, an annular stop ridge marked 6d is defined. -
Reference 15 inFigure 1 is a general reference for a barrier assembly which in the embodiment illustrated comprises an essentiallytubular body 16 mounted so as to be axially moveable in the internal passage 6e defined inside theintermediate portion 6a and inside thetop end portion 6c of the opening and closingmember 6. - The
tubular body 16 ends at the top in the form of ahead 17 which supports, around a mushroom-shaped configuration 18, anannular seal 19, of elastomeric material for example, designed to operate as the actual barrier by acting on thevalve seat 4 of thebody 2. - Beneath the
head 17, a plurality ofopenings 20 are formed in the wall of thetubular body 16 through which the region located in theportion 5a of thepassage 5, above thesealing ring 14, communicates with theaxial passage 16a of theaforesaid body 16. - The
helical spring 12 extends partially into thetubular element 16 of thebarrier assembly 15 and reacts at its top end against an internal shoulder of this tubular element. -
Reference 21 is an external ring mounted on the lower end of thetubular element 16 to face theannular stop configuration 6d on the opening and closingmember 6. - The arrangement described above is such that when the system comprising the opening and
closing member 6, thebarrier assembly 15 and thefitting 8 is disconnected from thebody 2, thespring 12 keeps thebarrier assembly 15 in the condition of maximum retraction from theend 6c of themember 6. In this condition thering 21 of thebarrier assembly 15 is pressed against theannular stop configuration 6d of themember 6. - When the system defined above is connected to the
body 2 by screwing themember 6 into the threadedportion 5b of thepassage 5 and is screwed almost all the way home, thebarrier 19 contacts thevalve seat 4. Continued screwing of themember 6 causes the assembly to arrive at the condition illustrated inFigure 1 , in which thering 21 of thebarrier assembly 15 is off theannular stop configuration 6d, and thehelical spring 12 is slightly compressed. - In operation, in order to discharge the plumbed installation to which the cock 1 is fitted, all that is required is to unscrew the member 6: initially the
barrier 19 remains in contact with thevalve seat 4, until thering 21 reaches theannular configuration 6d of themember 6; after which, as themember 6 continues to be unscrewed, the latter draws thebarrier 19 away from thevalve seat 4. The liquid can then flow from thepipe 3 to thepassage 5, then through theopenings 20 into theinternal passage 16a of the barrier assembly, and finally through thefitting 8 into thedrain tube 10. - In normal operation of the plumbed installation to which the drain cock 1 is fitted, the latter is also able to perform the pressure regulating function: if the pressure of the fluid upstream of the
valve seat 4 exceeds a predetermined threshold, whose value depends on the characteristics of thespring 12, theentire barrier assembly 15 moves translationally downwards against the action of said spring, allowing a partial drainage of fluid from thepipe 3 to thedrain tube 10. - As soon as the pressure upstream of the
valve seat 4 drops to a predetermined level, thebarrier assembly 15 is returned to the condition shown inFigure 1 by action of thespring 12. -
Figure 2 shows a variant of thefitting 8. In this variant thebottom portion 8b of this fitting is inserted into atubular extender 22. This extender has atop portion 22a slid leaktightly into the bottom portion of thefitting 8, and abottom portion 22b or nipple onto which thedrain tube 10 can be force fitted. - A
clip 23 or split pin prevents theextender 22 being pulled out of thefitting 8. The extender is however able to execute a limited axial translational stroke relative to thefitting 8. - A
spring 24 is inserted between theportion 22a of theextender 22 and an internal shoulder of theportion 8b of thefitting 8. The action of this spring is to tend to keep theextender 22 in the position illustrated inFigure 2 , where itstop portion 22a is pressed against theclip 23. - Conveniently but not necessarily the
extender 22 has a projectingintermediate configuration 22c of for example hexagonal shape for operation by a spanner or the like when theextender 22 and thetube 10 connected to it are to be turned. -
Figures 3 to 5 show a variant of a drain cock with built-in pressure regulator according to the present invention. In these figures, parts and components corresponding functionally to parts and components already described are given the same reference numbers as before. - In the embodiment shown in
Figures 3 to 5 the drain cock 1 comprises abody 2 which is essentially of "male" type, and has an externally threadedintermediate portion 5b. - Correspondingly, the hand-actuated opening and closing
member 6 is of "female" type and has an internally threadedend portion 6a for screwing onto theportion 5b of thebody 2. - The opening and closing
member 6 has abottom portion 6b, connected to the bottom end of which is anextender 8 onto which thedrain tube 10 is pushed. -
Figure 3 also shows, at 14, an O-ring seal inserted between thebody 2 and the opening andclosing member 6. In the embodiment shown inFigures 3 to 5 thisring 14 is however placed in an annular groove in the bottom part of thebody 2. - As can be seen in
Figures 3 and4 , beneath thevalve seat 4 theportion 6b of themember 6 forms an annulartransverse shoulder 25, which defines a central opening orpassage 26. Around the edge of this opening 26 is anannular seal 27, made for example of an elastomeric material, which looks essentially C-shaped in transverse section. - As can be seen in
Figure 3 , in the operating condition of the cock 1 thetop portion 27a of sealingring 27 presses against thevalve seat 4 of thebody 2. - A plurality of through
openings 28 which are radially external to the sealingring 27 are defined in theannular shoulder 25 of themember 6. The function of theopenings 28 will be described below. - In the embodiment shown in
Figures 3 to 5 abarrier assembly 15 is mounted moveably inside the opening and closingmember 6 and consists, in the example illustrated, of a simple cup-shapedmember 16 held in place by thehelical spring 12 in engagement with the bottom portion orunderside 27b of the sealingring 27. - As seen in
Figures 3 and5 , a plurality oflongitudinal ribs 29 are conveniently formed in theportion 6b of themember 6, beneath theannular shoulder 25, to guide the axial movement of thebody 16. - In the condition of use the cock 1 described above is in the condition shown in
Figure 3 . If the pressure in the installation to which the cock 1 is fitted rises too high, this cock can act as a pressure regulator. What happens is that the pressure of the fluid acts on the top surface of thebarrier member 16, pushing it away from the sealingring 27, in opposition to the reaction of thespring 12, which is correspondingly compressed. A quantity of liquid can then be drained out through thepassages 30 defined between the side skirt of thebarrier member 16 and the guide ribs 29 (Figure 5 ). - When used as a drain cock, the
member 6 is unscrewed manually from thebody 2 in such a way that the sealingring 27 comes away from thevalve seat 4. Consequently, although thebarrier member 16 remains in engagement with the underside of the sealingring 27, a quantity of liquid can flow from thepipe 3 to thedrain tube 10, passing through theopenings 28 in theshoulder 25 and thepassages 30 defined between theguide ribs 29 of themember 6. - The version described above with reference to
Figures 3 to 5 has the advantage that the pressure threshold at which the cock 1 acts as a pressure regulator does not depend on how tightly themember 6 is screwed onto thebody 2. - Also in the version shown in
Figure 3 thefitting member 8 may be modified to the version shown inFigure 2 . -
Figure 6 shows another variant of a drain cock according to the present invention. In this figure, once again, certain parts or components corresponding to parts and components already described have again been given the same reference numbers as before. - In the embodiment shown in
Figure 6 the drain cock 1 comprises abody 2 designed to be connected to or even built into the use installation, or into the body of the boiler to which it is fitted. - Defined within the
body 2 is apipe 3 which leads to afirst valve seat 4, shown by the edge of an opening formed in a side wall of thepipe 3. This pipe also leads to another valve seat, marked 33. - The cock 1 in
Figure 6 again includes a hand-actuated opening and closingmember 6 connected disconnectably to a matching configuration of thebody 2. In particular, thebody 2 forms a tubular projection in which is defined apassage 5, downstream of thevalve seat 4. This tubular portion of thebody 2 has anexternal thread 5b on which the internally threaded opening and closingmember 6 is screwed. - An essentially
cylindrical rod 34 with aperipheral sealing ring 35 which engages with the surface of thepassage 5 is coaxially fixed to themember 6. Thedistal end 34a of therod 34 carries an annular sealing ring which forms thebarrier 19 acting on thevalve seat 4. - The
passage 5 communicates with achamber 36 formed in thebody 2 around thevalve seat 33. On the opposite side from thepassage 5, thechamber 36 communicates with thedrain pipe 32 formed in a tubular projection of thebody 2. -
Reference 31 inFigure 6 is a diaphragm barrier, its perimeter being clamped between thebody 2 and an associated body 2' which is screwed onto the latter. Thediaphragm barrier 31 is connected to an end portion orhead 37a of a moveable body marked by thegeneral reference 37. Aspring 12 tends to push thebody 37 down in such a way as to keep the central portion of thediaphragm barrier 31 engaged on thevalve seat 33. In this condition theinlet passage 3 is disconnected from thedrain passage 32 because of the closure of thevalve seat 4 by thebarrier 19 and because of the closure of thevalve seat 33 by thediaphragm barrier 31. - In use, when the
member 6 is manually unscrewed from thebody 2, thepassage 3 is able to communicate with thedrain pipe 32 through thechamber 36 due to the separation of thebarrier 19 from the opening orvalve seat 4. In this condition, however, thediaphragm barrier 31 remains engaged on thevalve seat 33. - However, when the
cock 6 is screwed onto thebody 2, as shown inFigure 6 , if the pressure of the liquid in theinlet passage 3 rises above a predetermined threshold, thebarrier 31 moves off theseat 33, against the action of thespring 12, allowing communication between theinlet passage 3 and thedrain pipe 32. Thebarrier 31 moves back onto theseat 33 as soon as the pressure of the liquid in theinlet passage 3 drops back below a predetermined level. - The embodiments shown in
Figure 3 and6 have the advantage that the drain cock function and the pressure regulating function are performed using separate liquid seals. Consequently, when the boiler or installation is drained following unscrewing of the opening and closingmember 6, the seal which performs the pressure regulating function is not handled and this makes it possible to keep it clean because it is not contaminated with impurities carried by the liquid drained from the installation. The sealing action of the pressure regulating part is therefore reliably maintained. - In the embodiment shown in
Figure 6 there is no need to adopt a solution of the type illustrated inFigure 2 , because the fitting in which thedrain pipe 32 is formed is fixed. -
Figure 7 shows a variant of the drain cock ofFigure 6 . Nonetheless, the same reference numbers are used inFigure 7 as before to define parts/components identical or substantially equivalent to parts/components already described. - Summarizing very briefly, in the variant shown in
Figure 7 thedrain pipe 32 has been made coaxially through the opening and closingknob 6. Thebody 2 is correspondingly simplified by the elimination of a fitting. - Clearly, without affecting the principle of the innovation, the specific embodiments may be considerably varied with respect to those described and illustrated purely by way of non-restrictive example, without thereby departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
- Drain cock (1) for a plumbed installation, particularly a wall-mounted boiler, comprisinga body (2) designed to be connected to or built into said installation and having a pipe (3) that leads to a valve seat (4),a hand-actuated opening and closing member (6) connected disconnectably to a matching formation (5b) on said body (2), particularly by a threaded connection,barrier means (15, 16, 19; 15, 16, 27; 19) connected to said opening and closing member (6) and able to act on said valve seat (4), in such a way that when said member (6) is, relative to the body (2), in a closed position and in an open position, respectively, said barrier means shut off and disengage from, respectively, said seat (4), preventing and permitting, respectively, communication between an upstream portion of the installation and a region downstream of said valve seat (4);characterized in thatit comprises a moveable barrier (19; 16; 31) separated from the opening and closing member (6) and stressed by associated elastic means (12) towards a shutoff position in which it is able, when said member (6) is in the closed position, to prevent the passage of liquid between the pipe (3) of the body (2) and a discharge passage (8b; 32);the arrangement being such that said barrier (19; 16; 31) is able to move from said shutoff position, against the action of the elastic means (12), when the pressure of the fluid upstream of said seat (4) exceeds a predetermined value, to a position in which it allows fluid to be discharged from the portion of the installation upstream of said seat (4) to the aforesaid discharge passage (8b; 32).
- Drain cock (1) according to Claim 1,
characterized in thatthe opening and closing member (6) defines in its interior, downstream of said valve seat (4), at least one passage (16a; 30) for a flow of liquid, and said barrier means comprise a barrier (19; 16) which is moveable inside the opening and closing member (6) and stressed by associated elastic means (12) towards a shutoff position in which it is able, when said member (6) is in the closed position, to shut off the communication between the pipe (3) of the body (2) and the internal passage (16a; 30) of said member (6);the arrangement being such that said barrier (19; 16) is able to move from said shutoff position, against the action of the elastic means (12), when the pressure of the fluid upstream of said seat (4) exceeds a predetermined value, to a position in which it allows fluid to be discharged from the portion of the installation upstream of said seat (4) to the aforesaid region downstream of the seat (4). - Drain cock according to Claim 2, in which the barrier (16, 19) extends partially outside of the opening and closing member (6) and has a seal (19) able to act on said valve seat (4).
- Drain cock according to Claim 3, in which the opening and closing member (6) is of male general configuration, and is mounted removably in a female seat (5b) in said body (2).
- Drain cock according to Claim 2, in which said barrier means (15, 16, 27) comprise a sealing ring (27) fixed to the opening and closing member (6) and able to push against said valve seat (4) when this member (6) is in the closed position, and a barrier body (16) which is moveable in said member (6), on the opposite side of said sealing ring (27) from the seat (4), under the action of the elastic means (12) which tend to push it against said sealing ring (27); in which opening and closing body (6) is defined at least one passage (28) that bypasses said sealing ring (27) to allow fluid to be discharged from the pipe (3) of the body (2) when the opening and closing member (6) is moved to an open position.
- Drain cock according to Claim 5, in which the opening and closing member (6) is of female general configuration and is mounted removably on a male configuration (5b) of the aforesaid body (2).
- Drain cock according to any one of the preceding claims, in which there is connected to the opening and closing member (6) a fitting (8) to which a drain tube (10) may be rotatably connected (Figure 2).
- Drain cock according to Claim 1 or 5, comprising first and second liquidtight sealing means (27a, 27b; 19, 31) capable of engaging with corresponding valve elements (4, 16; 4, 33) for controlling, independently of each other, communication between said pipe (3) of the body (2) and the discharge passage (8b; 32).
- Drain cock according to Claim 8, in which the first (19) and second liquidtight sealing means (31) engage with corresponding openings or valve seats (4, 33) that are separate from each other and located between said pipe (3) and the discharge passage (32).
- Drain cock according to Claim 9, in which the discharge passage (32) is formed through the opening and closing member (6).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000513A ITTO20070513A1 (en) | 2007-07-12 | 2007-07-12 | DRAIN VALVE WITH INCORPORATED PRESSURE LIMITER, PARTICULARLY FOR WALL-MOUNTED AND SIMILAR BOILERS |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2048438A2 true EP2048438A2 (en) | 2009-04-15 |
EP2048438A3 EP2048438A3 (en) | 2013-11-13 |
EP2048438B1 EP2048438B1 (en) | 2018-09-12 |
Family
ID=40300607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08160018.1A Active EP2048438B1 (en) | 2007-07-12 | 2008-07-09 | Pressure limiter, particularly for wall-mounted boilers and the like |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2048438B1 (en) |
ES (1) | ES2700840T3 (en) |
IT (1) | ITTO20070513A1 (en) |
TR (1) | TR201818652T4 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE556415A (en) * | ||||
US1429296A (en) * | 1920-01-27 | 1922-09-19 | Casin W Obert | Auxiliary pressure-relief device for steam boilers |
US2906289A (en) * | 1956-12-14 | 1959-09-29 | Kunkle Valve Company | Relief valve |
US20050072156A1 (en) * | 2003-10-02 | 2005-04-07 | Toshihiro Tsutsui | Rankine cycle apparatus |
-
2007
- 2007-07-12 IT IT000513A patent/ITTO20070513A1/en unknown
-
2008
- 2008-07-09 ES ES08160018T patent/ES2700840T3/en active Active
- 2008-07-09 TR TR2018/18652T patent/TR201818652T4/en unknown
- 2008-07-09 EP EP08160018.1A patent/EP2048438B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE556415A (en) * | ||||
US1429296A (en) * | 1920-01-27 | 1922-09-19 | Casin W Obert | Auxiliary pressure-relief device for steam boilers |
US2906289A (en) * | 1956-12-14 | 1959-09-29 | Kunkle Valve Company | Relief valve |
US20050072156A1 (en) * | 2003-10-02 | 2005-04-07 | Toshihiro Tsutsui | Rankine cycle apparatus |
Non-Patent Citations (1)
Title |
---|
PERKO H-D ET AL: "SICHERHEITSEINRICHTUNGE FUER VERSCHIEDENE AUFGABEN IN KRAFTWERKEN", VGB KRAFTWERKSTECHNIK, VGB KRAFTWERKSTECHNIK GMBH. ESSEN, DE, vol. 75, no. 7, 1 July 1995 (1995-07-01), pages 597-602, XP000516390, ISSN: 0372-5715 * |
Also Published As
Publication number | Publication date |
---|---|
ES2700840T3 (en) | 2019-02-19 |
ITTO20070513A1 (en) | 2009-01-13 |
TR201818652T4 (en) | 2019-01-21 |
EP2048438B1 (en) | 2018-09-12 |
EP2048438A3 (en) | 2013-11-13 |
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