EP1950354B1 - System separator - Google Patents

Description

Technical area

1. (a) der Systemtrenner einen stromaufwärtigen Rückflussverhinderer, einen stromabwärtigen Rückflussverhinderer und einen als Kolben ausgebildeten, federbeaufschlagten Ablassventilkörper aufweist, der strömungsmäßig zwischen den Rückflussverhinderern angeordnet ist,
2. (b) das Gehäuse mit einer Gehäusebohrung und mit einer mit der Gehäusebohrung fluchtenden, verschließbaren Gehäuseöffnung versehen ist,
3. (c) innerhalb der Gehäusebohrung ein als Patrone ausgebildeter Druckminderer vorgesehen ist, der als Ganzes aus dem Gehäuse herauslösbar ist, und
4. (d) die Druckmindererpatrone, die Rückflussverhinderer und der Ablassventilkörper koaxial innerhalb der Gehäusebohrung angeordnet sind.

The invention relates to a system separator for physically separating an upstream fluid system from a downstream fluid system by means of a drain valve provided in a housing in response to the pressure differential between the upstream and downstream fluid systems

1. (a) the system separator comprises an upstream backflow preventer, a downstream backflow preventer and a piston-formed, spring-loaded dump valve body fluidly disposed between the backflow preventers;
2. (B) the housing is provided with a housing bore and with a housing bore aligned, closable housing opening,
3. (C) within the housing bore designed as a cartridge pressure reducer is provided, which is liberable as a whole from the housing, and
4. (D) the pressure reducer cartridge, the backflow preventer and the drain valve body are arranged coaxially within the housing bore.

System separators or pipe dividers serve to safely prevent backflow of liquid from a downstream liquid system into an upstream liquid system. The upstream fluid system may be a drinking water system. The downstream fluid system may be, for example, a heating system. It must be absolutely prevented that contaminated water from the heating system when refilling or refilling the heating system flows back into the drinking water system, for example, the fact that the pressure in the drinking water system collapses for some reason. There are so-called. Backflow preventer. These are spring-loaded valves which allow fluid flow in only one direction, namely from the upstream to the downstream system. However, such backflow preventers can become leaky. Therefore, for example, is a drinking water and heating water Separation of the fluid systems alone by backflow preventer not allowed. There must be a physical separation of the fluid systems, so that in case of failure between the systems a connection to a drain and to the atmosphere is made.

State of the art

System or pipe separators usually include an upstream backflow preventer connected to the upstream liquid system and a downstream backflow preventer connected to the downstream system. Between the backflow preventers is disposed a pressure controlled dump valve which establishes a passage from the upstream liquid system to the downstream liquid system when there is a sufficient pressure differential between the two liquid systems so that the liquid can safely flow only from the upstream to the downstream liquid system. If this pressure drop does not exist, the drain valve establishes a connection of the space between the backflow preventers with the atmosphere and a drain.

A system separator is for example in the DE 10 2005 031 422.8 or in the DE 10 2005 049 110.3 described. In the local arrangement, the drain valve is a spring-loaded, displaceable in a Arniaturengehäuse piston. This piston has a central passage and at its downstream end face an annular valve seat, which comes to a valve-tight ring seal axially to the plant. The passage then establishes an atmosphere-closed connection between the upstream and downstream fluid systems. The upstream backflow preventer sits in the passageway. As a result, the pressure difference between the inlet pressure in the upstream fluid system and a mean pressure acting in a medium pressure space between the piston and the downstream non-return valve acts on the piston against an opening-acting spring. For a flow to the downstream system can take place, even this pressure difference must exceed a predetermined, determined by the spring force measure.

If, for example, a low-pressure heating system from a drinking water system is to be filled via the system separator, the inlet pressure in the drinking water system initially forces the piston of the discharge valve against the action of the spring acting on it into its operating position in which it connects to the drinking water system Atmosphere and interrupts the process and establishes a connection between drinking water system and heating system. Then, the upstream and downstream backflow preventers are pressed. It streams drinking water to the heating system and fill it up or down. The heating system is then filled to an outlet pressure that is below the inlet pressure. In normal operation, the difference between inlet pressure and outlet pressure is determined by the pressure drop across the backflow preventers, that is, by the strength of the return valve springs. The intermediate pressure is in accordance with the pressure drop across the upstream backflow preventer and the pressure drop across the upstream backflow preventer. The pressure difference between the inlet pressure and the mean pressure must be greater than a limit determined by the loading spring of the valve body of the drain valve.

System separators must be of type "BA" depending on the area of application. This means that they must be provided with test connections, which allow a review of the pressure conditions. This is particularly the case when particularly contaminated water to be separated from the drinking water supply.

The filling of heating systems takes place with the correspondingly reduced by the system separator inlet pressure, which occurs when an upstream barrier is opened. Such inlet pressure is typically in the range of 4 bar and corresponds to the pressure that is set behind the drinking water supply with about a pressure reducer for the building. There are applications where filling or refilling with lower pressure is desirable. In these applications, the system separator can be followed by a pressure reducer. The downstream pressure reducer is then adjusted to a lower pressure. Such a pressure reducer prevents in particular that water flows after when the desired heating pressure has set, that is, when the filling or Refilling process is completed. The arrangement with a downstream pressure reducer is bulky, requires a particularly large number of components and is correspondingly expensive to produce. The installation is also expensive.

EP 1681520 A2 The applicant discloses an arrangement with a pressure reducer and a system separator arrangement. The arrangement has a housing with a housing bore. The housing bore has two openings. An opening forms a housing socket, in which a pressure reducer is inserted. The pressure reducer is not provided as a whole in the housing bore, but sits on the neck. Another opening is provided at the opposite end of the housing bore. Through this opening, the components of the system separator are accessible. The use of two openings requires that both housing ends be spaced from the pipeline. This makes the arrangement voluminous and heavy. It requires a lot of space for transport and storage. The use of two openings in particular requires a high assembly cost. Two steps must be carried out: first, the pressure reducer becomes "from the left", and second, the backflow preventer and other components of the system separator are inserted "from the right". Also, two different drilling steps must be performed to make the housing bore.

EP 928023 A1 Applicant discloses a system separator with a pressure reducer. The pressure reducer is located between the backflow preventer of the system separator. The arrangement is very voluminous and complicated in manufacture and assembly. Each component practically has its own housing opening, through which it is accessible.

EP 1 452 652 A2 teaches that a system separator and a pressure reducer can be used in one arrangement. Here, the system separator sits in an elongated housing, which is arranged at an angle to the tube axis. The pressure reducer is arranged perpendicular to the tube axis and is located outside the housing bore, in which the system separator is arranged.

Disclosure of the invention

It is an object of the invention to provide a compact system separator of the type mentioned with effective pressure control.

According to the invention the object is achieved in that the pressure reducer cartridge, the backflow preventer and the drain valve body are accessible through the same housing opening. In other words, the system separator and the pressure reducer arrangement are arranged in the same housing bore. As a result, the arrangement is particularly compact. It only needs a component to be installed. For the required maintenance, the housing opening is opened and the components of the system separator and the pressure reducer cartridge are easily accessible.

The system separator includes an upstream backflow preventer, a downstream backflow preventer, and a piston-formed, spring-loaded dump valve body fluidly disposed between the backflow preventers, the pressure reducer cartridge, the backflow preventer, and the dump valve body being coaxially disposed within the housing bore. As a result, a particularly compact, coaxial arrangement is achieved. All components are made accessible through the same housing opening.

In one embodiment of the invention, the pressure reducer on a cooperating with a fixed valve disc valve seat body, which is adjustable by an acted upon by the output pressure in the closing direction of the lifting member against the action of a helical spring preload. The valve seat body with the valve seat forms the movable part. The valve plate is fixed. The valve seat body is guided displaceably in this embodiment on a valve spindle connected to the valve spindle with an axial bore. The outlet of the downstream non-return valve opens into the axial bore in the valve stem and the bore is connected to the space upstream of the valve seat. The downstream backflow preventer is thus integrated directly into the pressure reducer cartridge.

In a particularly preferred embodiment of the invention, the valve spindle is integrated into a cartridge case, which is insertable into the housing bore up to a stop, wherein the downstream backflow preventer can be inserted into the cartridge case. The valve stem and the backflow preventer can therefore be pulled together with the cartridge case from the housing bore. In this case, the valve spindle at the downstream end may comprise the valve plate, which projects into an interior of the cup-shaped valve seat body, wherein the valve spindle in the region of the interior of the valve seat body in the radial direction has a thickening which acts as a driver for the valve seat body when detaching the cartridge case from the housing bore , Then, the valve seat body is pulled out of the housing bore together with the cartridge case.

Preferably test ports are provided which allow a pressure measurement in the inlet, in the outlet and in the medium pressure space between the backflow preventer of the system separator. These BA system separators may also be used for separation of particularly contaminated water.

Embodiments of the invention are the subject of the dependent claims. An embodiment is explained below with reference to the accompanying drawings.

Brief description of the drawings

Fig.1

is a perspective view of a system separator with pressure reducer.

Fig.2

shows the system separator Fig. 1 with internal components in exploded view.

Figure 3

is a cross section through the system separator with pressure reducer Fig. 1 and Fig.2 ,

Figure 4

shows the valve seat body of the pressure reducer in detail.

Description of the embodiment

Fig.1 shows a system separator designated generally by 10 type BA. The system separator 10 has an inlet 12 and an outlet 14. The inlet 12 is connected to the water supply line (not shown) during installation. On the outlet side, the device to be filled, for example a heating system, is provided.

Between inlet 12 and outlet 14 a generally designated 16 housing is provided. On the underside of the housing, a discharge hopper 18 is provided for a drain valve described below. At the top of the housing three lockable test ports 20, 22 and 24 are provided for pressure measurements.

The housing longitudinal axis of the housing 16 is not coaxial between inlet 12 and outlet 14, but at an angle. This allows an opening at the housing end, which is closable with a cover 26.

Fig.2 shows an exploded view with the provided within a housing bore 28 components. On the inlet side, a drain valve body 30 is provided. The drain valve body is exposed to the spring force of a spring 32. Upon opening the lid 26, the spring 32 pushes the drain valve body with the associated components described below out of the housing bore. This makes it easily accessible. Behind the spring, a cartridge case 34 is shown, which surrounds the spring in the assembled state. The cartridge case includes a pressure reducer assembly. Together with the cartridge case 34 is a belonging to the pressure reducer valve seat body 36 of the housing bore 28 can be removed. It can be seen that all components can be inserted and released in alignment with the housing bore. In this case, the cartridge case 34 is formed such that it can be easily pulled out of the opening 28 with a suitable tool.

Figure 3 shows a cross section of the system separator 10 with integrated pressure reducer. It can be seen that the test port 20 is connected to the inlet region of the inlet 12. The test port 24 is connected to the outlet portion of the outlet 14. The test port 22 is connected to the medium pressure chamber 38 of the system separator.

The intermediate pressure chamber 38 is disposed between an upstream backflow preventer 40 and a downstream backflow preventer 42 (not shown in section). The upstream non-return valve 40 is seated in a drain valve body 44, similar to known system separators. The drain valve body, together with a seat seal 46, forms the drain valve 48. The drain valve 48 operates with a compensation piston and a sealing force boost as shown in FIG DE 10 2005 031 422.8 and in the DE 10 2005 049 110.3 are described. The backflow preventer 40 and 42 and the discharge valve 48 form a compact system separator, which is arranged coaxially with the housing bore 28.

The seat seal 46 of the drain valve 48 is disposed in a shoulder 50 in the inner wall of the cartridge case 34. The cartridge case 34 is an elongate member and abuts with the outer wall on the inside of the housing bore 28. It is sealed with seals 54 and 56. The cartridge case 34 is inserted into the housing bore 28 up to a stop 52.

The cartridge case 34 forms a downstream open collar 58. In the collar, a spring 60 is disposed. The inside of the collar 58 forms the spring abutment for the spring 60. The spring 60 acts on a two-part valve seat body 36th

The pot-shaped valve seat body 36 is movably guided with its inside on a valve spindle 62. The valve spindle 62 is provided with an axial bore 64. The valve spindle 62 is integrally formed on the collar inside 58 of the cartridge case 34. In this manner, the spring 60 surrounds the valve stem 62. On the inlet side, the downstream non-return valve 42 is seated in the flared end of the bore 64 in the valve stem 62. At the outlet end of the valve stem 62, a valve disc 66 is disposed with a seal 70. The seal 70 is seated in a surround body 72, the one opposite the valve stem has increased diameter. The valve disk 66 closes or opens an opening 68 in the plane side of the valve seat body 36. A connection with the outlet 14 is established via the opening 68. The valve disk 66 and the valve seat body 36 form a pressure reducing valve.

In the outlet region, a cavity 74 is formed between the valve stem and the valve seat body. When the pressure reducing valve is open, the outlet pressure prevails in this cavity. A connecting channel 76 connects the bore 64 in the valve spindle 62 with an annular space 78 in the shell of the valve seat body 36. Figure 4 shows the valve seat body 36 with connecting channel separately. When filling or refilling prevails in the bore 64 in the connecting channel 76 and in the annular space 78 of the system separator slightly reduced input pressure. When the output pressure is higher than this input pressure, the valve seat body 36 is against the spring pressure of the spring 60 to the left in Figure 3 pushed onto the valve plate. Then the pressure reducing valve is closed. As the outlet pressure in the outlet 14 decreases, the spring and inlet pressure push the valve seat body 36 to the right Figure 3 , The valve opens until the outlet pressure returns to the set value.

The valve seat body 36 is formed in two parts so that it can be mounted around the widened end of the valve spindle 62 around. When pulling out this end remains hanging in the valve seat body 36 and takes this out of the housing bore 28.

Claims (5)

1. System disconnector (10) for physical disconnecting an upstream liquid system from a downstream liquid system by means of an outlet valve (48) provided in a housing (16) the disconnecting being effected depending on the pressure drop between the upstream and the downstream liquid system wherein

   (a) the system disconnector is provided with an upstream backflow preventer (40), a downstream backflow preventer (42) and an outlet valve body in the form of a piston (44) biased by a spring, said outlet valve body disposed between said backflow preventers,

   (b) the housing (16) is provided with a bore (28) and an opening (26) in alignment with said bore (28), said opening adapted to be closed, and

   (c) in that a pressure reducer (66, 36) in the form of a cartridge is provided in said bore (28), which is adapted to be removed in one piece from the housing (16), and

   (d) and wherein the pressure reducer cartridge (34, 36) the backflow preveters (40, 42) and the outlet valve body (44) are disposed in alignment inside the bore (28),

   (e) the pressure reducer cartridge (34, 36), the backflow preventers (40, 42) and the outlet valve body (44) are accessible through the same opening in the housing,

   characterized in that
   the pressure reducer cartridge (34, 36), the backflow preventers (40, 42) and the outlet valve body (44) are adapted to be inserted into the housing opening (28) and removed from the housing opening in alignment from the same side.
2. System disconnector according to claim 1, characterized in that

   (a) the pressure reducer is provided with a valve seat body (36) cooperating with a fixed valve disc (66), said valve seat body being adjustable by a lifting member exposed to the outlet pressure in the closing direction against the effect of a helical spring (60),

   (b) the valve seat body (36) is slidably guided on a valve spindle (62) connected to the valve disc (66) with an axial bore (64), and

   (c) the outlet of the downstream backflow preventer (42) ends in the axial bore (64) in the valve spindle (62) and the bore (64) is connected to the space upstream of the valve seat.
3. System disconnector (10) according to claim 2, characterized in that the valve spindle (10) is integrated in a cartridge housing (34) which is adapted to be inserted into the bore (28) up to a stop (52) and said downstream backflow preventer (42) is adapted to be inserted into the cartridge housing (34).
4. System disconnector (10) according to claim 3, characterized in that the valve spindle (62) is provided with a valve disc (66) at its downstream end, said valve disc extending into the inner space of the pot-shaped valve seat body (36), and wherein the valve spindle (62) is provided with a thickened portion (72) in a radial direction in the range of the inner space (74) of the valve seat body (36), said thickened portion (36) serving as a dog for removing the cartridge housing (34) from the bore (28).
5. System disconnector (10) according to any of the previous claims, characterized in that test sockets (20, 22, 24) are provided enabling a pressure control at the inlet (12), at the outlet (14) and in the medium pressure chamber (38) between the backflow preventers (40, 42) of the system disconnector.

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