Frost-proof outdoor wall tap with system separator

Description

[0001] The present invention relates to an external wall nozzle according to the preamble of claim 1.

[0002] A version of an external wall nozzle in which the valve seat is located inside the outer wall is known from document DE 101 10 585 C1. In this version, a connector is attached to the outlet pipe, into which a valve spring and a closing element are inserted as a flow valve, which act as a backflow preventer. The backflow preventer is arranged upstream of a drain-side connection and has a flow valve that allows fluid to drain from the valve body and blocks fluid from flowing from the connection into the valve body. The backflow preventer thus acts as a system separator.

[0003] DE 10 2020 134 275 A1 discloses a generic external wall nozzle with a valve body that extends into the exterior wall of a building or even through the exterior wall into the interior of the building to relocate the nozzle's valve seat to an area behind the frost line in the exterior wall. The actuating rod, which is also extended and configured as a rotating spindle in this document, extends from the rotary handle to the valve seat and moves toward or away from the valve seat depending on the direction of rotation of the rotary handle to allow water to escape or to close the valve.

[0004] When combining an external wall nozzle with a valve body located in the external wall and a backflow preventer, the problem remains that although the area around the valve seat can be kept frost-free, draining the valve body still requires additional measures. Particularly when combining an internal valve seat with a downstream backflow preventer, the water trapped between the valve seat and the backflow preventer in the valve body remains in the pipe because it cannot drain away. If the ambient outside air temperature is below zero, it can cause frost damage to the valve body, the water pipe, and / or the backflow preventer.

[0005] Document DE 10 2020 134 275 A1 proposes providing the threaded sleeve, which is used to move a valve pin, with a drainage opening through which the line section between the line closure and the valve body can be drained. To create a flow channel between the line section and the drainage opening, the valve pin and the threaded sleeve interact in such a way that, starting from a certain axial position of the valve pin in the threaded sleeve, a flow channel opens between the outer circumference of the valve pin and the inner surface of the threaded sleeve in the area of ​​a constriction, through which the water in the line section can drain.However, since the flow channel is located on the inside of the threaded sleeve and the cylindrical wall of the threaded sleeve at least partially fills the pipe cross-section of the valve housing, a residual amount of the water contained therein remains in front of the threaded sleeve when the flow channel is open, even if the pipe section is in a horizontal position.

[0006] It is the object of the present invention to provide an external wall tap valve combined with a system separator, which enables improved emptying of the valve body and the water line between the valve seat and the system separator.

[0007] The problem is solved for a generic external wall nozzle with the characterizing features of claim 1.

[0008] The inside of the pipe wall has an annular surface that reduces the pipe cross-section in the area between the internal thread and the end of the threaded sleeve pointing towards the line closure. The annular surface is arranged in an area into which the threaded sleeve extends with a first segment. The threaded sleeve is movable along this annular surface in a lifting movement corresponding to the axial direction of the line section. The lifting movement is brought about by screwing the threaded sleeve into or out of the internal thread. The threaded sleeve is moved using the rotary handle. The threaded sleeve is shaped such that its outer circumference is smaller than the inner diameter of the annular surface, at least in the area of ​​the first and second segments.

[0009] Since the annular surface has a height offset to the surrounding inside of the pipe wall which reduces the pipe cross-section, the threaded sleeve rests with its first segment closely against the annular surface when the threaded sleeve is in the first section of the stroke movement. When this description refers to the threaded sleeve being in the first section of the stroke movement, this means a spatial position in which the first segment of the threaded sleeve is in a position in which the annular surface revolves around the first segment. When the first segment of the threaded sleeve is in a position that is laterally offset from the annular surface in an axial direction of the actuating rod, the threaded sleeve is in the second section of the stroke movement.The first segment of the threaded sleeve is the part of the threaded sleeve that, in conjunction with the annular surface, seals the gap between the annular surface and the first segment when the threaded sleeve is in the first section of the stroke movement. The second segment of the threaded sleeve is a part of the threaded sleeve that follows the first segment, offset laterally in the axial direction of the stroke movement, and, when the threaded sleeve is in a drainage position, defines a flow channel between the annular surface and the second segment on one side.

[0010] Positioning the first segment in a position where its circumferential surface is close to the annular surface enables reliable sealing of the gap with a suitable seal. When the threaded sleeve has been moved into the second section of the stroke movement, the first segment of the threaded sleeve is in a position where it is no longer adjacent to the annular surface. Since the inside of the pipe wall adjacent to the annular surface has a larger cross-section than the annular surface, this results in a free gap between the circumferential surface of the first segment and the inside of the pipe wall, through which any fluid in the pipe section can flow towards the drainage opening.Since the outer circumference of the second segment is also smaller than the inner diameter of the annular surface, and the gap between the outer circumference of the second segment and the annular surface is not sealed when the threaded sleeve is in the second section of the stroke movement, fluid from the pipe section can also flow through this gap toward the drainage openings. The inner diameter of the annular surface, which reduces the pipe cross-section, the sealing of the gap between the first segment and the annular surface, the displacement of the first segment into a second position adjacent to the annular surface, and the lack of sealing of the gap between the second segment and the annular surface after the displacement of the first segment make it possible to selectively open or close a flow channel to the drainage opening near the pipe wall.

[0011] The annular surface and a circumferential surface of the threaded sleeve formed in the first segment define a gap between them which is sealed by a seal against the flow of a fluid located in the line section to a drainage opening located downstream of the seal when the threaded sleeve is in the first section. Thus, when the threaded sleeve is moved back and forth in the first section during normal operation, the line closure is opened or closed, depending on the position of the closing element. Within the first section of the stroke movement, the threaded sleeve can be moved back and forth as desired in the axial direction of the line section by rotating the rotary handle in order to open or close the line closure as required without any fluid loss through the drainage opening.

[0012] When the pipe closure is open, a fluid, especially water, can flow into the pipe section. Since the space between the annular surface and the circumferential surface in the area of ​​the first segment of the threaded sleeve is sealed by the seal, the incoming fluid can only flow into the system separator and from there into the connection.

[0013] The threaded sleeve extends with a second segment into the area of ​​the annular surface when the threaded sleeve is in the second section. The second segment is formed adjacent to the first segment on the threaded sleeve, so that when the threaded sleeve transitions from the first to the second section, the flow channel opens immediately and the screw movements for draining the line section can be reduced to a necessary minimum. The space between the annular surface and the circumferential surface of the second segment of the threaded sleeve is not sealed with a gasket and therefore forms a flow channel for a fluid located in the line section to the drainage opening.The threaded sleeve is advantageously shaped in the region of the second segment so that the gap between the circumferential surface of the second segment and the annular surface is sufficiently large to allow for reasonably rapid emptying of the line section. Since the line closure is necessarily closed when the threaded sleeve is located in the second section, no fluid can flow from the pipe network into the line section when the fluid in the line section flows out of it via the flow channel.

[0014] Since the space usable for emptying is located between the outer circumference of the threaded sleeve and the annular surface on the pipe wall, the residual amount of liquid still remaining inside the pipe section can no longer accumulate in front of the end face of the threaded sleeve. The only step that can still retain residual amounts of liquid in the pipe section is the lateral inclined surface facing towards the pipe section adjacent to the annular surface, by the extent of which the annular surface protrudes beyond the inner surface of the adjacent pipe wall into the free cross-section of the pipe wall in this area. The amount of liquid accumulating in front of this annular surface can be further reduced by installing the pipe section in a building not exactly horizontally, but with a slight gradient.This allows any residual fluid that would otherwise accumulate in front of the annular surface to drain almost completely from the pipe section and exit the valve body through the drainage opening. The shallower step created by the annular surface compared to the step formed by the front wall of the threaded sleeve, as is known from the prior art, significantly improves the drainage of the pipe section. The lower amount of residual water remaining in the pipe section also significantly reduces the risk of frost damage to the valve body after the pipe section has been drained.

[0015] When the threaded sleeve is moved from the first section to the second section of the stroke movement by rotating the rotary handle, the continued movement of the threaded sleeve in the axial direction of the line section and the inevitable standstill of the valve pin, which is blocked by the actuating rod against further movement in the axial direction, change the relative position of the valve pin to the threaded sleeve. The further the threaded sleeve is moved into the second section, the further the valve pin is immersed in the receiving chamber against the force of the spring located therein. Because the receiving chamber is closed, the immersion movement of the valve pin into the receiving chamber has no influence on the outflow of fluid from the line section.The spring tension of the compressible spring is designed to hold the actuating rod pressed firmly against the valve seat in its closed position, ensuring that the external wall nozzle remains tightly closed in this position. The restoring forces built up in the spring ensure that the line closure remains closed when the threaded sleeve is rotated back from the second section to the first section.

[0016] The rotary handle typical of a valve is supplemented by a drainage option for the valve body, which is integrated into the function of the rotary handle. The combination of the threaded sleeve, the annular surface formed on the pipe wall, the valve pin, the actuating rod serving as a stop, and the spring form a closing valve that can be easily opened to almost completely drain the interior of the valve body.

[0017] The interaction of the annular surface with the threaded sleeve and the valve pin integrated therein makes it possible to drain at least most of the fluid in the valve body, leaving an air pocket inside the valve body that can at least partially compensate for volume changes in the fluid in the valve body. With a suitable arrangement of the valve body, it is even possible to empty the valve body largely or completely. Frost-related damage to the external wall nozzle can thus be easily prevented, even though the drainage of the residual fluid in the valve body from the external wall nozzle is blocked by the system separator.

[0018] What makes this particularly user-friendly is that the operation of the external wall tap valve remains unchanged during normal use of the on / off function. Only when drainage is required is the rotary handle screwed in further, which is also easy to accomplish in itself. Visually, the faucet is very appealing overall because the special technical function does not overwhelm the visible functionality, and the faucet retains its simple basic shape.

[0019] The closing element of the line closure can be a valve cone, a sealing disc or a similar sealing element, which can have a coating made of a flexible material such as rubber in the area of ​​the sealing surface in order to increase the sealing effect.

[0020] According to one embodiment of the invention, an annular channel is formed in the circumferential surface of the threaded sleeve formed in the first segment, into which a mechanical seal is inserted to prevent the flow of a fluid located in the line section through the space between the annular surface and the first segment. The mechanical seal is held in the annular channel and is driven by the threaded sleeve whenever the threaded sleeve moves. Installation of the mechanical seal is simple, as it can be inserted into the annular channel as an O-ring before the threaded sleeve is mounted in the valve body.

[0021] According to one embodiment of the invention, the annular surface has a width in the axial direction of the stroke movement that corresponds at least to the length of the stroke of the actuating rod between a maximum open position and a closed position of the actuating rod. The correspondence of the width of the annular surface to the stroke movement ensures that no fluid escapes from the line section when the threaded sleeve is in the first section of the stroke movement. During a stroke movement of the threaded sleeve within the first section, the seal inserted into the intermediate space continuously contacts the annular surface because the width of the annular surface completely covers the stroke movement within the first section.

[0022] According to one embodiment of the invention, a driver is arranged in the receiving space of the threaded sleeve, which driver engages in a recess in the valve pin, wherein the recess has a support surface at its end facing the rotary handle, via which the driver contacts the valve pin when the threaded sleeve is in the first section of the stroke movement, and the recess extends so far in the direction of the line closure that the driver can move therein following the stroke movement of the threaded sleeve without contacting the valve pin when the threaded sleeve is in the second section of the stroke movement. When the line closure is to be opened, the threaded sleeve is in the first section of a stroke movement. To open the line closure, the threaded sleeve is rotated in a direction in which the threaded sleeve moves away from the line closure in a stroke movement.In order for the actuating rod to also be moved, the valve pin, which is firmly connected to the actuating rod, must be driven in the opening direction via the driver, thus transferring the lifting movement of the threaded sleeve to the actuating rod. During the opening movement, the valve pin is pressed onto the compressible spring, which then compresses and in which restoring forces build up. When the external wall nozzle has been opened to a desired opening position, the driver holds the valve pin and thus also the actuating rod in its current position. If the line closure is to be closed again or the inflowing amount of liquid is to be throttled, the threaded sleeve is turned in a direction in which the threaded sleeve moves in a lifting movement towards the line closure.During such an infeed movement, the valve pin is no longer driven by the driver, but rather the valve pin is moved towards the line closure by the compressible spring. The driver holds the valve pin in a position that corresponds to the current screw-in position of the threaded sleeve. This prevents the valve pin and the actuating rod from snapping back into the closed position of the line closure. When the line closure is closed, it is no longer necessary for the driver to drive the valve pin or to slow it down. However, when the threaded sleeve is rotated into the second section of the stroke movement, the driver must not block such a stroke movement of the threaded sleeve. For this reason, a recess is formed in the valve pin which has a shape and length that allows the driver to move in line with the stroke movement of the threaded sleeve without coming into contact with the valve pin.

[0023] According to one embodiment of the invention, the driver is designed as a snap ring inserted into the inward-facing surface of the receiving space of the threaded sleeve. The snap ring is easy to install in the threaded sleeve by being inserted into a groove provided for this purpose before the threaded sleeve is installed in the valve body. Because the driver is designed as a ring running circumferentially inside the receiving space, the forces acting on it are transmitted evenly over the entire circumference of the receiving space and the valve pin between the valve pin and the threaded sleeve. The risk of the valve pin becoming distributed or wearing unevenly in the receiving space due to uneven forces acting on it is thus reduced.

[0024] According to one embodiment of the invention, the support surface is designed as an annular surface in a plane oriented perpendicular to the axial direction of the stroke movement. The annular surface transmits the acting forces evenly distributed over the entire circumference of the receiving space and the valve pin between the valve pin and the threaded sleeve. The perpendicular orientation reduces the risk of the valve pin becoming jammed in the receiving space.

[0025] According to one embodiment of the invention, the threaded sleeve is screwed into a threaded insert, on the inside of which is the internal thread, and the threaded insert has an external thread with which the threaded insert is screwed into the tube of the valve body. The threaded insert facilitates the fastening of the threaded sleeve in the valve body. The threaded insert and the threaded sleeve can be more easily manufactured and machined as separate components. Through suitable material selection and a precise fit, these components remain tight over a long service life and yet always remain easily movable. Both the threaded insert and the threaded sleeve can be sealed in the connection area with each other and with the tube using separate seals.

[0026] According to one embodiment of the invention, a vent hole is incorporated into the valve body. The vent hole is located on the outlet side of the valve body in the direction of fluid flow behind the annular surface, as it is intended to assist in emptying the valve and is only needed then. Preferably, it is located in the opposite area of ​​the drain opening, depending on its position in the pipe wall, in the wall of the threaded insert and / or in the wall of the threaded sleeve, so that the fluid can drain out of the valve body via the drain opening and, at the same time, air flows into the interior of the valve body through the vent hole. This compensates for any negative pressure that would otherwise arise due to the loss of volume of the fluid in the interior of the valve body.

[0027] Further features of the invention emerge from the claims, the figures and the subject description.

[0028] The invention will now be explained in more detail using a preferred embodiment and with reference to the accompanying drawings.

[0029] They show: Fig. 1: a sectional view from the side of a closed external wall nozzle, Fig. 2: a sectional view from the side of an open external wall nozzle, Fig. 3: a sectional view through the assembly of the valve body with the threaded sleeve and the valve pin in a position in which the line closure is open, and Fig. 4: the assembly of the Fig. 3 shown valve body with the threaded sleeve and the valve pin in a position in which the line closure is closed and the flow channel from the line section to the drainage opening is open.

[0030] In the Fig. 1 und 2 Each shows a sectional view of an external wall nozzle 2. The valve body 4 of the external wall nozzle 2 has a line section 6, the inlet-side line shaft of which is considerably longer than a conventional nozzle. Deviating from the length of the line shaft in the illustrated embodiment, its length can also be shorter or longer as required. A rotary handle 8 is attached to the outward-facing side of the external wall nozzle 2, with which the external wall nozzle 2 can be opened and closed. For this purpose, the rotary handle 8 is connected to a threaded sleeve 9 in a rotationally fixed manner. In A valve pin 11 is arranged in the threaded sleeve 9, which, when screwed in, moves the actuating rod 10 in the valve body 4. A closing element 12 is mounted on the inlet end of the actuating rod 10, which is firmly connected to the actuating rod 10 and is moved in the axial direction when the actuating rod 10 moves. The closing element 12 can be mounted on a valve seat 14, as shown in Fig. 1 shown, to tightly close the external wall nozzle 2 so that no liquid flows into the pipe section 6. If water is to flow through the external wall nozzle 2 from the inlet side, the actuating rod 10 is lifted from the threaded sleeve 9 in the axial direction away from the pipe closure by turning the threaded sleeve 9 with the rotary handle 8 out of the valve body 4 in a direction away from the pipe closure 16. The closing element 12 is then lifted from the valve seat 14, as shown in Fig. 2 shown, so that the external wall nozzle 2 is opened. The closing element 12 and the valve seat 14 together form a line closure 16.

[0031] By extending pipe section 6, the pipe closure 16 is relocated so far inward into the masonry of an exterior wall of a building that it is above the frost line and cannot freeze. The pipe closure 16 of the exterior wall nozzle 2 is thus frost-proof. To achieve a sufficient relocation of the pipe closure 16 toward the interior of the building, it is advisable to position the pipe closure 16 as close as possible to the inlet end of pipe section 6. The length of pipe section 6 is selected by a specialist to ensure sufficient frost resistance of the exterior wall nozzle 2.

[0032] The valve body 4 of the external wall nozzle 2 also includes a pipe section in which a system separator 20 is arranged. The system separator 20 serves the purpose of preventing backflow of fluid from the pipe connected to the connection 21 into the valve body 4 and the inlet-side pipe network.

[0033] The Fig. 3 shows a sectional view through the assembly of the valve body 4 with the threaded sleeve 9 and the valve pin 11 in a position in which the line closure 16 is open. The enlarged view shows the receiving space 17 in the threaded sleeve 9, into which the spring 19 and the valve pin 11 are inserted and held. As indicated by the double arrow in the valve pin 11, the valve pin 11 is movable in the axial direction A in the receiving space 17.

[0034] In the Fig. 3 However, in the illustration shown, the valve pin 11 is in its outermost position, which can be seen from the fact that the seal 32 is located on the right-hand outermost edge of the annular surface 23 in the position shown. In this position of the valve pin 11, the actuating rod 10 is pulled into the outermost open position via the driving element 18, so that the closing element 12 is in the Fig. 2 shown open position. When the threaded sleeve 9 is closed with the rotary handle 8, the seal 32 moves over the annular surface 23 to its left end. The width B of the annular surface 23 is in Fig. 4 The seal 32 is held in the annular channel 33, which runs around the outer circumference of the threaded sleeve 9 in the area of ​​the first segment 24. When the seal 32 is located at the left end of the annular surface 23, the closing element 12 is placed on the valve seat 14, so that the line closure 16 is closed, as shown in the Fig. 1 shows. The part of the Fig. 3 shown lifting movement H, which the threaded sleeve 9 carries out with the valve pin 11 in order to open and close the line closure 16 in the manner described above, corresponds to the first section I of the stroke movement H. In Figur 3 The lifting movement H of the threaded sleeve 9 shown in the figure is only shown as a movement that the first segment 24 of the threaded sleeve 9 performs during a lifting movement of the threaded sleeve 9. Since the threaded sleeve 9 is designed as a single piece, when the threaded sleeve 9 is screwed in or unscrewed, it is not just its first segment 24 that moves, but the threaded sleeve 9 as a whole.

[0035] The driving element 18 can establish a rigid connection between the actuating rod 10 and the valve pin 11. In the exemplary embodiment, the driving element 18 can be designed as a screw, via which the valve pin 11 is rigidly connected to the actuating rod 10.

[0036] Normally, the flow of a liquid in the pipe section 6 of the external wall nozzle 2 is blocked by the flow valve 22. To still allow the pipe section 6 to be emptied, the threaded sleeve 9 must be moved into the second section II of the stroke movement H. The end position that can be reached by the threaded sleeve 9 is in Fig. 4 shown. The Fig. 4 shows the assembly of the Fig. 3 shown valve body 4 with the threaded sleeve 9 and the valve pin 11 in a position in which the line closure 16 is closed and the flow channel 30 from the line section 6 to the drainage opening 31 is opened. While the circumferential surface 26 of the first segment 24 of the threaded sleeve 9 is in the area of ​​the annular surface 23 when the threaded sleeve 9 is rotated into the first section I of the stroke movement H, the first segment 24 is in the Fig. 4 shown drainage position laterally offset to the width B of the annular surface 23. Due to the lifting movement of the threaded sleeve 9 towards the line closure 16, the circumferential surface 27 of the second segment 25 is now adjacent to the annular surface 23. Since the second segment 25 has a smaller outer circumference than the first segment 24, the Fig. 4 shown gap 29 between the annular surface 23 and the second segment 25 is larger than that shown in Fig. 3 shown gap 28 between the annular surface 23 and the first segment 24. While the gap 28 is additionally sealed by the seal 32, the second segment 25 lacks a separate seal that could seal the gap 29. In this way, the gap 29 forms a flow channel 30 for a liquid that is to flow out of the line section 6. The flow of the liquid from the line section 6 past the first segment 24 and the seal 32 into the flow channel 30 and from there into the drainage opening 31 and through this to the outside is in Fig. 4 represented by dashed lines. Since the annular surface 23 and the second segment 25 are each cylindrical, the liquid can flow around the first segment 24 into the intermediate space 29 and drain downward through the annular intermediate space 29 into the drainage opening 31.

[0037] In Fig. 4 The components are also shown with which the threaded sleeve 9 entrains the valve pin 11 and the actuating rod 10 firmly connected to it when the line closure 16 is opened and presses it against the compressible spring 19. On the inside of the receiving space 17 there is a driver 34 which, when the threaded sleeve 9 opens, is pressed against a support surface 36 located at the front end of the recess 35 in the valve pin 11. The driver 34 entrains the valve pin 11 via the pressure exerted on the support surface 36 when the threaded sleeve 9 rotates in the opening direction in the first section I. When the threaded sleeve 9 is rotated in the closing direction in the first section I of the stroke movement H, the spring 19 presses the valve pin 11 in the closing direction. The driver 34 acts as a stop which blocks a rapid rebound movement of the valve pin 11.When the threaded sleeve 9 is rotated into the second section II of the stroke movement H, the driver 34 can move in the recess 35 following the stroke movement of the threaded sleeve 9 without contacting the valve pin 11 because the recess 35 extends correspondingly far in the direction of the line closure 16. In the exemplary embodiment, the support surface 36 is formed as an annular surface in a plane that is oriented perpendicular to the axial direction A of the stroke movement H.

[0038] From the Figuren 3 and 4 It can also be seen that in the exemplary embodiment the threaded sleeve 9 is screwed into a threaded insert 37, on the inside of which the internal thread 15 is located, and the threaded insert 37 has an external thread 38 with which the threaded insert 37 is screwed into the tube 3 of the valve body 4.

[0039] The invention is not limited to the above embodiment. It will be readily apparent to those skilled in the art to modify the embodiment in a manner deemed appropriate to adapt it to a specific application. List of reference numbers

[0040] 2External wall nozzle 3Pipe 3aPipe wall 4Valve body 6Line section 7Sleeve section 8Turning handle 9Threaded sleeve 10Actuating rod 11Valve pin 12Closing element 13External thread 14Valve seat 15Internal thread 16Line closure 17Receiving chamber 18Drive element 19Spring 20System separator 21Connection 22Through-flow valve 23Annular surface 24First segment 25Second segment 26Circumferential surface in the first segment 27Circumferential surface in the second segment 28Space between annular surface and first segment 29Space between annular surface and second segment 30Flow channel 31Drainage opening 32Seal 33Annular channel 34Drive element 35Recess 36Support surface 37Threaded insert 38External thread Aaxial direction BWidth of the ring surface HStroke movement IFirst section of the stroke movement IISecond section of the stroke movement

Claims

1. External wall nozzle (2) with a valve body (4) having a pipe (3) with a pipe wall (3a), the inlet-side pipe shaft of which has a pipe section (6) which, in the installed state, forms a pipe section extending into the building wall, a rotary handle (8) arranged on the side of the external wall nozzle (2) facing outwards in the installed state, and a pipe closure (16) arranged in the valve body (4) in the half of the pipe section (6) facing away from the rotary handle (8), wherein the rotary handle (8) is non-rotatably connected with a threaded sleeve (9) which has an external thread (13) in a sleeve section (7), which supports the threaded sleeve (9) on an internal thread (15) so that it can rotate and is held displaceably in the valve body (4) via the rotational movement in a lifting movement (H) extending in an axial direction (A), wherein the threaded sleeve (9) cooperates with a valve pin (11) which is supported via a spring (19) compressible in an axial direction (A) of the lifting movement (H) on a base of a receiving space (17) formed in the threaded sleeve (9) and is held movably in the receiving space (17) in the axial direction (A), wherein the valve pin (11) transmits a movement of the threaded sleeve (9) in the axial direction (A) to an actuating rod (10) via a drive element (18), which is firmly connected with a closing element (12) arranged in the region of the pipe closure (16), which, together with a valve seat (14) arranged in a fixed position in the valve body (4), forms the pipe closure (16), wherein the closing element (12) is located in a first section (I) of the lifting movement (H) of the threaded sleeve (9) between a maximally open position and a position in which it is sealingly placed on the valve seat (14) and thereby closes the pipe closure (16), and the valve pin (11) is held immersed in the receiving space (17) during a lifting movement (H) of the threaded sleeve (9) in a second section (II) of the lifting movement (H) by the actuating rod (10) supported on the valve seat (14) against the force of the compressible spring (19), and a system separator (20) is arranged on the valve body (4) in front of an outflow connection (21), which has a flow-through valve (22) that allows fluid to flow out of the valve body (4) and blocks the inflow of fluid from the connection (21) into the valve body (4), characterized in that the inside of the pipe wall (3a) in the region between the internal thread (15) and the end of the threaded sleeve (9) facing in the direction of the pipe closure (16) has an annular surface (23) which reduces the cross-section of the pipe (3) and is arranged in a region into which the threaded sleeve (9) extends with a first segment (24), wherein the annular surface (23) and a circumferential surface (26) of the threaded sleeve (9) formed in the first segment (24) define a space (28) between them, which is sealed by a seal (32) against the flow of a liquid located in the pipe section (6) to a drainage opening (31) located downstream of the seal (32), when the threaded sleeve (9) is located in the first section (I), and the threaded sleeve (9) extends with a second segment (25) into the region of the annular surface (23) when the threaded sleeve (9) is located in the second section (II), and the space (29) between the annular surface (23) and the circumferential surface (27) of the second segment (25) of the threaded sleeve (9) is not sealed with a seal and forms a flow channel (30) for a liquid located in the pipe section (6) to the drainage opening (31).

2. External wall nozzle (2) according to claim 1, characterized in that an annular channel (33) is formed in the circumferential surface (26) of the threaded sleeve (9) formed in the first segment (24), in which a sliding ring seal is inserted as a seal (32) against the flow of a liquid located in the pipe section (6) through the space (28).

3. External wall nozzle (2) according to claim 1, characterized in that the annular surface (23) has a width (B) in the axial direction (A) of the lifting movement (H) which corresponds at least to the length of the lifting path of the actuating rod (10) between a maximum open position and a closed position of the actuating rod (10).

4. External wall nozzle (2) according to one of the preceding claims, characterized in that a driver (34) is arranged in the receiving space (17) of the threaded sleeve (9), which driver engages in a recess (35) in the valve pin (11), wherein the recess (35) has a bearing surface (36) at its end facing the rotary handle (8), via which the driver (34) contacts the valve pin (11) when the threaded sleeve (9) is in the first section (I) of the lifting movement (H), and the recess (35) extends so far in the direction of the pipe closure (16) that the driver (34) can move therein following the lifting movement of the threaded sleeve (9) without contacting the valve pin (11) when the threaded sleeve (9) is in the second section (II) of the lifting movement (H).

5. External wall nozzle (2) according to claim 4, characterized in that the driver (34) is designed as a snap ring inserted into the inwardly facing surface of the receiving space (17) of the threaded sleeve (9).

6. External wall nozzle (2) according to one of the preceding claims 4 or 5, characterized in that the bearing surface (36) is designed as an annular surface in a plane which is aligned at right angles to the axial direction (A) of the lifting movement (H).

7. External wall nozzle (2) according to one of the preceding claims, characterized in that the threaded sleeve (9) is screwed into a threaded insert (37) on the inside of which the internal thread (15) is located, and the threaded insert (37) has an external thread (38) with which the threaded insert (37) is screwed into the pipe (3) of the valve body (4).

8. External wall nozzle (2) according to one of the preceding claims, characterized in that a ventilation bore is provided in the valve body (4).