• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL2015317A
    申请号:NL2015317
    申请日:2015-08-18
    公开日:2016-07-08
    发明作者:Dirk Kolk Johan；Henricus Wilhelmus Giesen Leonardus；Jacobus Louis Nijsen Andreas
    申请人:W Kolk Beheer B V；
    IPC主号:
    专利说明:

    FIRE TAP AND METHOD FOR INSTALLING ONE
    FIRE CRANE
    The invention relates to a fire hydrant, comprising: - a standpipe with a first end and a second end, wherein the standpipe is provided at its first end with a closable water outlet opening and can be connected at its second end to a pressure pipe for water or the like; - a valve which is arranged near the second end in the standpipe and which is displaceable between a first position in which the valve closes the second end and thereby a flow-through connection with the pressure line and a second position in which the valve closes the second end and thus the releases flowable connection to the pressure line; - operating means for operating the valve between its first and second position, which operating means are arranged near the first end.
    Such a fire hydrant is known per se. Such a fire hydrant can be installed in or above the ground, the second, lower end being connected to an underground pipe system and wherein the water outlet opening at the first, upper end can be used for carrying out water in the event of a fire, for example.
    It is an object of the invention to improve the fire hydrant of the type mentioned in the preamble.
    In an embodiment of the fire hydrant according to the invention, the fire hydrant comprises a valve seat arranged near the second end in the standpipe. In the first position of the valve, the valve can rest on the valve seat and thus provide a good closure of the second end.
    According to an aspect of the invention, the valve seat has a larger outer diameter dimension than an inner diameter dimension of at least a part of the second end of the standpipe, such that the valve seat can be inserted into the standpipe only from the first end and said part of the second end of the standpipe. With the known fire hydrant, the valve seat is arranged in the standpipe from the second end, after which it is locally deformed to connect it to the standpipe. A disadvantage of this is that when the valve is moved to its first position, where much force can be used, the valve seat can be pushed away at least somewhat. As a result, it may be the case that the second end is not properly closed and used water can flow back to the piping system. Since this used water can be contaminated, this is not desirable. By giving the valve seat according to the invention a larger outer diameter dimension than an inner diameter dimension of at least said part of the second end of the standpipe, the valve seat rests on said part, and will move to the first part when moving the valve to its first a good closure of the second end can be provided, even or precisely when a great deal of force is used during the displacement.
    The fire hydrant comprises sealing means, for example one or more o-rings, which are arranged between the valve seat and the standpipe. A good seal between the valve seat and the standpipe can hereby be provided, as a result of which the water used cannot flow back via a possible space between them back to the pipe system. If the valve seat has the aforementioned larger outside diameter dimension according to the invention, when the valve is forcefully moved to its first position, the sealing means, in particular the o-ring, will be compressed further and provide an even better seal.
    In an embodiment of the fire hydrant according to the invention, at least a part of the outer surface of the valve seat is made of a material selected from the group comprising metal, for example (stainless) steel or brass, plastic, for example PE (polyethylene) or PP (polypropylene) , and rubber.
    In order to prevent used water from leaking back to the pipe system, the fire hydrant comprises a non-return valve freely movable in the second position of the valve.
    In an embodiment of the fire hydrant according to the invention, the non-return valve is provided at least over a part of its outer surface with a material adapted to said part of the outer surface of the valve seat.
    The material of the part of the outer surface of the non-return valve can, for example, be selected from the group comprising metal, for example (stainless) steel or brass, and plastic, for example PE (polyethylene) or PP (polypropylene).
    The materials of said parts of the non-return valve and the valve seat are preferably adapted to each other such that one of the materials is hard, for example metal, and the other material is somewhat flexible, for example plastic. A good seal between the non-return valve and the valve seat can hereby be provided. It is noted that said parts preferably comprise at least the abutment or contact surfaces between the non-return valve and valve seat. Due to the mutually adjustable valve seat and non-return valve, the fire hydrant according to the invention is of a modular design, whereby the user can choose which valve seat and non-return valve with which materials he wishes to use.
    In an embodiment of the fire hydrant according to the invention, at least a part of the outer surface of the non-return valve has a substantially spherical shape and at least a part of the inner surface of the valve seat has a substantially conical shape. With such shapes, a good seal can be obtained between the non-return valve and the valve seat. In particular, at least a part of the contact or contact surfaces between the non-return valve and the valve seat have such a similar shape.
    In an embodiment of the fire hydrant according to the invention, the non-return valve is provided on its outer circumference with a, preferably flexible, circumferential lip extending in the direction of the second end for sealing the non-return valve against the valve seat.
    An advantage of the circumferential lip extending from the outer circumference of the non-return valve towards the second end is that the water from the pressure line presses the circumferential lip against the valve seat and thus ensures a good seal of the non-return valve against the valve seat.
    In another embodiment of the fire hydrant according to the invention, the fire hydrant comprises flow guide means arranged in the standpipe for guiding a water flow to the water outlet opening in at least a second position of the valve.
    By guiding the water to the water outlet opening with the aid of the flow guide means, a pressure drop in the standpipe can be reduced. Due to the reduced pressure drop, a flow rate of the water outlet can be increased or an inside diameter of the fire hydrant can be made smaller to achieve the same flow rate as when no flow guide means according to the invention are provided. Being able to make the fire hydrant smaller has the advantage that a possible considerable cost saving can be achieved.
    The fire hydrant of the type mentioned in the preamble is usually practically designed such that the operating means are arranged in register with the second end and the valve, and that the water outlet opening is arranged next to it. As a result, the water at the known fire hydrant in the second position of the valve will flow substantially in the direction of the operating means, and then flow further to the water outlet opening and be carried out via this water outlet opening. This results in the above-mentioned relatively large pressure drop. In an embodiment of the fire hydrant according to the invention, the flow guide means are adapted to at least substantially close off a part of the standpipe, at least in the second position of the valve, which part is connected to the operating means, and at least substantially shut off the water flow to another part of to guide the standpipe, which other part is connected to the water outlet opening. The flow guide means according to this embodiment of the invention provide the advantage that the water is guided via the flow guide means to the other part of the standpipe, which is connected to the water outlet opening, and therefore not first against the closed part of the first end with the control means. flows. This can reduce the pressure drop.
    In another embodiment of the fire hydrant according to the invention, the flow guide means can optionally be releasably arranged at a fixed position in the standpipe. Such flow guiding means arranged at a fixed position are arranged both in the first position and in the second position of the valve in such a position that they can guide the water, which water only flows through the position pipe in the second position of the valve.
    In yet another embodiment of the fire hydrant according to the invention, the operating means comprise a valve stem arranged connected to the valve in the standpipe, which valve stem can be moved with the aid of the operating means in the standpipe for adjusting the valve between its first and second position . Because of such a valve stem it is practical, as described above, to arrange the operating means in register with, in particular straight above, the valve, so that the valve stem can be made straight.
    When using such a valve stem, in one embodiment of the fire hydrant according to the invention, it can be said that the flow guide means are possibly detachably connected to the valve stem, such that the flow guide means at least in the second position of the valve the water flow to the water outlet opening to guide. In this embodiment, the flow guide means are displaceable with the valve stem to move the valve between its first and second position and to arrange the flow guide means at a suitable position for guiding the water at least in the second position of the valve.
    It is noted that in this embodiment it is practical if the valve stem does not rotate during its movement to move the valve between its first and second position, but merely translates. As a result, the flow guide means will also only translate, as a result of which the orientation of the flow guide means during the displacement of the valve stem is not adjusted and remains suitable for guiding the water in a correct manner. For example, a rotary movement of the operating means with the aid of transfer means can be transferred into an exclusively translational movement of the valve stem.
    In yet another embodiment of the fire hydrant according to the invention, the valve stem has a substantially oval cross-sectional shape over at least a part of its length, the oval having a tapered shape substantially in the direction of the water outlet opening. Such a shape has better hydrodynamic properties than the usual round or cross-shaped cross-sectional shape, whereby the pressure drop of the water can be reduced. The shape according to the invention could also be described as egg-shaped or drop-shaped.
    The invention also relates to a method for installing a fire hydrant, comprising the steps of: (a) providing a fire hydrant according to any of claims 1 - 15, and (b) connecting the second end of the standpipe to a pressure pipe for water or the like.
    According to an embodiment of the method according to the invention, a fire hydrant according to at least claim 3 is provided in step (a), and the method comprises the step of: (c) arranging the valve seat in the standpipe from the first end until it is on said body part of the second end of the standpipe.
    As explained above, this step offers the advantage that when the valve is moved to its first position, the valve seat is just more firmly connected to the standpipe because it rests on the said part of the second end thereof, and cannot be pushed away as with the known fire hydrant may be the case.
    According to another embodiment of the method according to the invention, a fire hydrant according to at least claim 7 is provided in step (a), and the method comprises the steps of: (d) selecting a valve seat and a non-return valve such that the materials of said means parts of their surfaces are adapted to each other, and (e) arranging in the standpipe the valve seat and check valve selected in step (d).
    As described above, this offers the advantage of a modular fire hydrant, where the user can choose which valve seat and non-return valve he wants to use.
    The invention is further elucidated on the basis of figures shown in a drawing, in which: figures IA - IE show a first embodiment of the fire hydrant according to the invention with a valve located in a first position, figure IA a longitudinal section through the fire hydrant, Figures 1B and 1C show a detail of a second end of the fire hydrant of Figure 1A in two different orientations, namely as shown in Figure 1A (Figure 1B) and perpendicular thereto (Figure 1C), and Figures 1D and IE show a detail of a first end of the fire hydrant from Figure IA in two different orientations, namely as shown in Figure IA (Figure 1D) and perpendicular to it (Figure IE); figures 2A - 2E show the fire hydrant of figures IA - IE with a valve in a second position, figure 2A being a longitudinal section through the fire hydrant, figures 2B and 2C a detail of a second end of the fire hydrant figure 2A show in two different orientations, namely as shown in figure 2A (figure 2B) and perpendicular thereto (figure 2C), and figures 2D and 2E show a detail of a first end of the fire hydrant of figure 2A in two different orientations, namely, as shown in Figure 2A (Figure 2D) and perpendicular thereto (Figure 2E); figures 3A and 3B show the valve stem of figures IA - IE, 2A - 2E, wherein figure 3A shows the valve stem in perspective view and figure 3B shows a cross section of the valve stem; Figures 4A and 4B show a valve stem according to a second embodiment of the invention in two different perspective views; Figures 5A - 5C show a valve stem according to a third embodiment of the invention in two different perspective views (Figures 5A and 5B) and in mounted condition (Figure 5C); Figure 6 shows a valve seat, valve, and check valve according to a second embodiment of the invention; Figure 7 shows an aid for arranging the valve seat in the standpipe; and Figures 8A and 8B show a valve seat, valve, and check valve according to a third embodiment of the invention, wherein Figure 8B shows a detail of Figure 8A.
    In the figures, the same elements are designated with the same reference numerals.
    Figures 1A-IE and 2A-2E show a fire hydrant 1. The fire hydrant 1 comprises a standpipe 2 with a first, upper end 3 and a second, lower end 4. At its first end 3, the fire hydrant 1 comprises a closable water outlet opening 5, to which, for example during a fire, a hose can be connected for carrying out water and, for example, extinguishing the fire. At its second end 4, the fire hydrant 1 comprises a connecting piece 6 with which the fire hydrant 1 can be connected to a pressure line for water or the like. In the position pipe 2, near the second end 4 thereof, a valve 7 is arranged, which is displaceable between a first position (figures IA - IE) in which the valve closes the second end 4 and therewith a flow-through connection with the pressure line and a second position (figures 2A - 2E) in which the valve 7 releases the second end 4 and thus the flow-through connection with the pressure line. The valve 7 is connected via a valve stem 8 to operating means 9 arranged near the first end 3. For moving the valve 7 between its first and second position, the operating means 9 can be rotated, which rotating movement of the operating means 9 is converted into an exclusively translational movement of the valve stem 8 with the aid of transfer means, in this example, but not limiting for this, as described below.
    The operating means 9 comprise a body 10 which extends radially from a screw spindle 11 of the operating means 9. The body 10 is enclosed between two fixedly arranged parts 12, 13 of the fire hydrant 1, such that the body 10 at least substantially prevents translational movement of the operating means 9. At least a part of the screw spindle 11 received in the standpipe 2 is externally provided with screw thread, on which a spindle nut 14 with internal screw thread is arranged. It is noted that for the sake of simplicity the screw thread is not shown. The spindle nut 14 extends into a recess 15 of the valve stem 8 and is fixedly connected thereto. A guide part 16 of the valve stem 8 is received in an elongated, substantially vertically extending guide path 17 of the standpipe 2, with the aid of which guide part 16 and guide path 17 the valve stem 8 and thereby the spindle nut 14 translate a substantially exclusively translational displacement into vertical direction. When the operating means 9 rotate, the valve stem 8 will move over the length of the screw spindle 11 through the fixedly connected spindle nut 14, in upward or downward direction depending on the direction of rotation of the operating means 9. With an upward displacement of the valve stem 8 the valve 7 moves from its first position to its second position and upon a downward movement of the valve stem 8, the valve 7 will move from its second position to its first position.
    When using such an elongated valve stem 8, the operating means 9 are arranged directly above or in register with the valve 7. The water outlet opening 5 is arranged next to the operating means 9 and is therefore not directly above the valve 7. When water flows through the standpipe 2, the water will flow in the direction of the operating means 9. With the known fire hydrant, this results in a relatively large pressure drop, because the water flows substantially via the closed part of the first end 3 with the operating means 9 to the water outlet opening 5. It is part of the present invention to reduce this pressure drop, for which purpose a deflector 18 is provided. In this example, the deflector 18 is mounted on the valve stem 8, such that the deflector 18 can be moved with the valve stem 8 in the vertical direction. When the valve stem 8 is moved upwards, so that the valve 7 moves from its first position to its second position, the deflector 18 will be arranged from a first position to a second position in which the deflector 18 enters a part 19 connected to the operating means 9 main part. In this second position, the deflector 18 extends obliquely upwards from a wall of the standpipe 2 to the water outlet opening 5, where the deflector connects to a fixedly arranged guide element 20. In this second position of the valve 7, the deflector 18 and the guide element form Guide means for guiding the water flow to the water outlet opening 5.
    Figures 1B, 1C, 2B and 2C show the second end 4 of the standpipe 2 in more detail. From this it appears that the valve 7 comprises a non-return valve 21, which is freely movably connected to the valve 7 via a connecting member 22. When the valve 7 is in its second position shown in Figures 2B and 2C, the non-return valve 21 will move upwards due to the pressure of the water supplied from the pressure line, whereby the water through the standpipe 2 to and from the non-sealed water outlet opening 5 can flow. When the water pressure drops and / or the water wants to flow back to the pressure line, for example when the water outlet opening 5 is closed off, the non-return valve 21 will, due to the loss of water pressure and / or by exerting a downward pressure due to back-flowing water move the valve 7 downwards and thus close the second end 4 of the standpipe 2. The maximum downward displacement of the non-return valve 21 is limited by engaging means 23 which are arranged on an end of the connecting member 22 remote from the non-return valve, which, upon a downward displacement of the non-return valve 21, will engage on an edge 24 of the valve 7. Still Water present in the standpipe 2 can leave the standpipe 2 via an outlet opening 25, at least for a large part thereof, and will for instance be discharged to the sewer or groundwater. In this way it is at least substantially prevented that used and possibly contaminated water is returned to the pressure line and / or remains in the standpipe 2 for a longer period of time.
    As is also apparent from Figs. 1B, 1C, 2B and 2C, a valve seat 26 is provided in the second end 4 of the standpipe 2, on which the valve 7 and non-return valve 21 can rest to close off the second end 4. Sealing means in the form of an o-ring 27 are provided between the valve seat 26 and the standpipe 2 for sealing any space between them. In a contact area where a part 28 of the non-return valve 21 abuts a part 29 of the valve seat 26, the non-return valve 21 has a substantially spherical shape, in particular a part of a sphere, and the valve seat 26 has a substantially conical shape. In this example the valve seat 26 is made of metal and the non-return valve 21 comprises a cast-iron core which is covered with a plastic layer 30. The hard metal of the valve seat 26 and the somewhat flexible outer layer of the non-return valve 21 contribute to a good seal between them. The spherical part 28 of the non-return valve 21 is designed as a flexible lip. When water flows into a space between the flexible lip and the check valve 21, the flexible lip will be pressed against the valve seat 26 and thus provide an even better seal between them.
    As is also apparent from Figures 1B, 1C, 2B and 2C, the valve seat 26 has a larger outer diameter than an inner diameter of an edge 31 of the second end 4 of the standpipe 2. This allows the valve seat 26 to rest on the edge 31. Due to this larger dimension, the valve seat 26 can only be provided in the standpipe 2 from the first end 3, before or during the fitting of the operating means 9. After fitting the valve seat 26 in the standpipe 2, a flexible end zone 32 thereof can be second end 4 to be pressed outwards against the standpipe 2.
    Figures 3A and 3B show the valve stem 8 with valve 7 in detail. This shows that in this embodiment the deflector 18 is fixedly connected to the valve stem 8. For example, the deflector 18 and valve stem 8 can be made in one piece by casting. It also appears that in this embodiment the valve stem has a substantially oval cross-sectional shape over at least a part of its length, wherein the valve stem 8 has a substantially oval cross-sectional shape over at least a part of its length, the oval being substantially in the direction of the water outlet opening 5 has a pointed shape. The shape could also be described as egg-shaped.
    Figures 4A and 4B show a valve stem 8 with valve 7 according to a second embodiment. It is noted that only the differences with the valve stem from figures 1 - 3 will be described and that for a further description reference is made to the explanation associated with those figures. A difference with the valve stem 8 from figures 1 - 3 is that the deflector 18 is detachably connected thereto. To this end, the deflector 18 comprises two parts which can be arranged around the valve stem 8 and which can be connected to each other by mutually acting connecting elements 40, 41. To this end, one part of the deflector 18 has a number of protrusions 40 and the other part a number of recesses 41, wherein the protrusions 40 of the one part can be arranged in the recesses 41 of the other part for providing the connection. Each part of the deflector 18 and the valve stem 8 further comprise second connecting elements 42, 43 cooperating with each other for connecting the parts to the valve stem 8. For this purpose, each part of the deflector 18 has a protrusion 42 which is in a recess 43 of the valve stem 8 can be provided to provide the connection. It is clear that the connecting elements 40 - 43 can be designed differently, or that the deflector 18 just comprises recesses and the valve stem 8 has protrusions.
    Figures 5A - 5C show a valve stem 8 with valve 7 according to a third embodiment. It is noted that only the differences with the valve stem from figures 1-3 will be described and that for a further description reference is made to the explanation associated with those figures. A difference with the valve stem 8 from figures 1 to 3 is that the deflector 18 is not connected thereto but is fixedly arranged in the standpipe 2, in particular in a detachable manner. For this purpose, the deflector 18 comprises at its upper end an edge or flange 50, which can be mounted on a wall part of the standpipe 2, so that the deflector 18 is arranged more or less suspended in the standpipe 2. The deflector 18 according to this embodiment is therefore not displaceable but is arranged stationary in the standpipe 2. The deflector 18 comprises two parts which can be arranged around the valve stem 8 and which can be connected to each other by mutually acting connecting elements 51,52. To this end, one part of the deflector 18 has a number of protrusions 51 and the other part a number of recesses 52, wherein the protrusions 51 of the one part can be arranged in the recesses 52 of the other part for providing the connection. It is clear that the connecting elements 51, 52 can be designed differently and that the connection between the deflector 18 and the standpipe 2 can also be made differently.
    Figure 6 shows a second embodiment of the valve seat 26, valve 7 and non-return valve 21. It is noted that only the differences with the valve seat 26, valve 7 and non-return valve 21 from Figures 1-3 will be described and that for a further description referred to the explanation accompanying those figures. In this embodiment, the valve seat 26 comprises a metal core 60 with a rubber lining 61. At its outer circumference, the rubber lining 61 has a number of projections 62 extending radially therefrom, which extend against the standpipe 2 and thus provide a good seal therebetween. In this embodiment the non-return valve 21 does not comprise a spherical lip 28, but has a conical shape in the contact area with the valve seat 26. The valve seat 26 has a flexible lip 63 in its contact area with the non-return valve 21, which lip is firmly in contact with the non-return valve 21 and thus forms a good seal between them. When there is water between the flexible lip 63 and the standpipe 2, the lip 63 will be pressed against the non-return valve 21 even more firmly.
    It is noted that the user can choose as desired between the different embodiments of the deflector, the valve seat, valve and non-return valve, so that according to the invention a modular system is provided.
    Figure 7 shows aids 70, 71 for fitting the valve seat 26 in the standpipe 2. As has already been described above, the valve seat 26 is arranged in the standpipe 2 from the first end 3. The valve seat 26 is inserted into the standpipe 2 so far that the valve seat 26 rests on the edge 31 of the second end 4. The insertion can take place with the aid of a pressure rod 70, which presses the valve seat from the first end 3 into the standpipe 2. After the valve seat 26 has been fitted at the desired location, a second pressure rod 71 can be introduced from the second end 4 into the standpipe 2, which presses the flexible end zone 32 of the valve seat outwards against the wall of the standpipe 2.
    Figures 8A and 8B show a third embodiment of the valve seat 26, valve 7 and non-return valve 21. It is noted that only the differences with the valve seat 26, valve 7 and non-return valve 21 from Figures 1-3 will be described and that for a other description, reference is made to the explanation accompanying those figures. In this third embodiment, the valve seat 26 is provided on its outer circumference with a flexible circumferential lip 80 extending in the direction of the second end 4, in particular in the direction of the connecting piece 6. When water flows from the pressure line into a space between the flexible peripheral lip 80 and the check valve 21, the flexible peripheral lip 80 will be pressed against the valve seat 26 and thus provide a seal between them.
    It is noted that the invention is not limited to the embodiments shown, but also extends to variants within the scope of the appended claims.
    权利要求:
    Claims (19)
    [1]
    Fire hydrant, comprising: - a standpipe with a first end and a second end, wherein the standpipe is provided with a closable water outlet opening at its first end and can be connected at its second end to a pressure pipe for water or the like; - a valve which is arranged near the second end in the standpipe and which is displaceable between a first position in which the valve closes the second end and thereby a flow-through connection with the pressure line and a second position in which the valve closes the second end and thus the releases flowable connection to the pressure line; - operating means for operating the valve between its first and second position, which operating means are arranged near the first end.
    [2]
    Fire hydrant according to claim 1, comprising a valve seat arranged near the second end in the standpipe.
    [3]
    Fire hydrant according to claim 2, wherein the valve seat has a larger outer diameter dimension than an inner diameter dimension of at least a part of the second end of the standpipe, such that the valve seat can only be fitted in the standpipe from the first end and on said part rests on the second end of the standpipe.
    [4]
    Fire hydrant according to claim 3, comprising sealing means, for example one or more o-rings, which are arranged between the valve seat and the standpipe.
    [5]
    Fire hydrant according to any of claims 2-4, wherein at least a part of the outer surface of the valve seat is made of a material selected from the group comprising metal, for example (stainless) steel or brass, plastic, for example PE or PP, and rubber .
    [6]
    Fire hydrant according to one of the preceding claims, comprising a non-return valve freely movable in the second position of the valve.
    [7]
    Fire hydrant according to claims 6 and 5, wherein the non-return valve is provided at least over a part of its outer surface with a material adapted to said part of the outer surface of the valve seat.
    [8]
    Fire hydrant according to claim 7, wherein the material is selected from the group comprising metal, for example (stainless) steel or brass, and plastic, for example PE or PP.
    [9]
    Fire hydrant according to any of claims 6-8, wherein at least a part of the outer surface of the non-return valve has a substantially spherical shape and at least a part of the inner surface of the valve seat has a substantially conical shape.
    [10]
    Fire hydrant according to any one of claims 6-9, wherein the non-return valve is provided on its outer circumference with a, preferably flexible, circumferential lip extending in the direction of the second end for sealing the non-return valve against the valve seat.
    [11]
    Fire hydrant according to any one of the preceding claims, comprising flow guide means arranged in the standpipe for guiding a water flow to the water outlet opening in use in at least a second position of the valve.
    [12]
    12. Fire hydrant according to claim 11, wherein the flow guide means are adapted to at least substantially close off a part of the standpipe, at least in the second position of the valve, which part is connected to the operating means, and at least substantially close the water flow to another part of the standpipe, which other part is connected to the water outlet opening.
    [13]
    Fire hydrant according to claim 11 or 12, wherein the flow guide means can optionally be releasably arranged at a fixed position in the standpipe.
    [14]
    Fire hydrant according to any one of the preceding claims, wherein the operating means comprise a valve stem arranged in the standpipe connected to the valve, which valve stem can be moved with the aid of the operating means in the standpipe for adjusting the valve between its first and second position.
    [15]
    Fire hydrant according to claims 11 or 12 and 14, wherein the flow guide means are optionally releasably connected to the valve stem, such that the flow guide means guide the water flow to the water outlet opening at least in the second position of the valve.
    [16]
    Fire hydrant according to claim 14 or 15, wherein the valve stem has a substantially oval cross-sectional shape over at least a part of its length, wherein the oval has a pointed shape substantially in the direction of the water outlet opening.
    [17]
    A method for installing a fire hydrant, comprising the steps of: (a) providing a fire hydrant according to any of claims 1 to 15, and (b) connecting the second end of the standpipe to a water pressure line or the like .
    [18]
    A method according to claim 16, wherein a fire hydrant according to at least claim 3 is provided in step (a), and comprising the step of: (c) arranging the valve seat in the standpipe from the first end until it is positioned on said part of the second end of the standpipe.
    [19]
    A method according to claim 17 or 18, wherein a fire hydrant according to at least claim 7 is provided in step (a), and comprising the steps of: (d) selecting a valve seat and a non-return valve such that the materials of said parts of the surfaces thereof are adapted to each other, and (e) arranging in the standpipe the valve seat and check valve selected in step (d).
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE639655C|1934-03-04|1936-12-10|Polte Fa|Water post|
    DE3423806A1|1984-06-28|1986-01-16|Bopp & Reuther Gmbh, 6800 Mannheim|SURFACE HYDRANT|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NL2013336A|NL2013336B1|2014-08-18|2014-08-18|Fire hydrant and method for installing a fire hydrant.|
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