GB2586527A - Pressure reducer assembly - Google Patents

Abstract

A pressure reducing assembly 10 for a water installation comprises a housing 12 with an inlet 16 and an outlet 18, and a pressure reducing valve arranged in the flow path with a first valve closing body 82, 84. A safety valve with a second valve closing body 90 has a moving direction coaxial with the moving direction of the first valve closing body 82, 84. A drain (28, Fig. 5) is provided for draining water which escapes through the opened safety valve with excess pressure. The valve closing body 90 of the safety valve is connected to a transmission element (168, Fig. 4) for venting the safety valve.

Description

Patent Application Hans Sasserath GmbH & Co. KG, Muhlenstrasse 62, D-41352 Korschenbroich Pressure reducer assembly

Background of the invention

The invention relates to a fitting assembly for a water installation, comprising: (a) a housing with an inlet and an outlet; (b) a pressure reducer valve arranged in the flow path between the inlet and the outlet with a first valve closing body, (c) a safety valve with a second valve closing body, whose moving direction is coaxial to the moving direction of the first valve closing body; and (d) a drain for draining of water which escapes through the opened safety valve upon excess pressure Pressure reducers are used for the control of the pressure in a water installation, such as a drinking water feed line in a building or in a heating system. A pressure reducer is provided with a pressure reducer valve which opens if the pressure drops at the outlet side. Water will then flow until the pressure reaches a set value. After reaching the set pressure value the valve will close. The pressure in the downstream water installation cannot the exceed the set value if the inlet pressure is increased.

Safety valves are valves in closed water installations which open if a set pressure value in the water installation is exceeded. Water and/or steam is released from the downstream water installation through the safety valve until the pressure drops below the set value. Safety valves serve to prevent excess pressure, for example in boilers of drinking water heaters.

Prior Art

Pressure reducers are known from, for example, DE 20 2009 015 673 Ul. From DE 10 2007 00 215 B3 a system disconnector is known which is provided with a pressure reducer in the form of a cartridge. A system disconnector disconnects systems by means of two backflow preventers and a pressure-controlled drain valve therebetween. It is not possible to open the drain valve upon excess pressure in the downstream system. The system disconnector is not provided in the cartridge. DE 20 2009 013 661 Ul discloses a pressure reducer which is integrated in a fitting with a filter.

DE 33 30 299 Al discloses a safety fitting with a pressure reducer, where the valve plate of the pressure reducer valve is moveably guided on a valve spindle and where it is biased by a spring to a closed position. The valve has only one valve closing body in the form of one valve plate which has both functions: the function of the pressure reducer valve and the function of the backflow preventer. If the pressure reducer is removed in order to, for example, be serviced, the adjustment and settings of the pressure reducer is lost.

There are countries where venting for testing of the safety valve is mandatory.

Disclosure of the invention

It is an object of the invention to provide a compact fitting assembly with a pressure reducer valve and a ventable safety valve.

According to the present invention this object is achieved in that (e) the valve closing body of the safety valve is connected to a transmission element for venting the safety valve which extends coaxially to the moving direction of the valve closing body of the safety valve; and (0 the drain is provided with a drain opening in the housing, which extends laterally to the moving direction of the valve closing body.

Thereby, a particularly compact assembly is achieved. The coaxial assembly of both valves requires only few components. The lateral assembly of the drain opening also allows for the coaxial assembly of a transmission element for venting the safety valve.

In a preferred modification of the invention the housing is composed of several parts and comprises a housing part with the drain opening, which is rotatably connected to the remaining housing. By rotating the housing part with the drain opening, the fitting may be adapted to the installation environment. The fitting, therefore, has minimal space requirements and does not require additional installation adapters or the like.

With an inexpensive modification of the invention, it is provided that the housing part with the drain opening can be inserted into a receptacle of the remaining housing and is secured against movement in the coaxial direction by means of a bracket. The housing then has, for example, a fitting assembly with a socket, into which a housing ring may be screwed. A housing cap can then be rotatably connected to the housing ring by means of a bracket. The bracket is inserted through lateral housing openings in the cap and the housing ring.

In particular, it can be provided that (a) the pressure reducer valve and the safety valve together form a cartridge, and (b) the cartridge with the pressure reducer valve and the safety valve is releasable from the remaining housing from the outside as a whole.

With a, for example, two-part assembly with a housing cap and a housing ring the housing ring can be securely screwed to a fitting assembly. By disconnecting the screw joint, the entire cartridge assembly can be detached and replaced or serviced Preferably, the cartridge provides a drain opening which is aligned with the drain opening of the rotatable housing part and the cartridge and/or the rotatable housing part provides a dog so that the cartridge follows a turning movement of the rotatable moveable housing part.

It can be provided therein that the cartridge is provided with a cartridge housing having a thread for sealingly screwing the cartridge into a socket of the housing which forms the receptacle. However, it is also possible to use nuts or other fixing elements which allow for rotation.

In a modification of the invention it is provided that the housing is provided with a partition wall in the flow path between the inlet and the outlet the partition wall having an opening which is controlled by the pressure reducer valve However, it is also possible to use a piston pressure reducer.

In a modification of the invention the transmission element for venting the safety valve comprises a valve spindle and a venting grip. In particular, the venting grip can be assembled within a housing cap and may be accessible by means of a sealable opening in the housing cap. The venting grip is then protected against unwanted or unintentional operation.

With a particularly convenient and flexible modification of the invention, it is provided that the housing provides a cold water connection on the side of the outlet It can further be provided that a backflow preventer is installed at the outlet.

Further modifications of the invention are subject matter of the subclaims. An embodiment is described below in greater detail with reference to the accompanying figuress.

Definitions In this description and in the accompanying claims all terms have the meaning well known to the person skilled in the art which is defined in technical literature, norms such as DIN EN 801-1 and DIN EN 1717 and the relevant internet sites and publications, in particular of the lexical kind, such as www.wikipedia.de, www.wissen.de or ww-w.techniklexikon.net, of competitors, research institutes, universities and associations, such as, for example, Deutscher Verein des Gas-und Wasserfaches e.V. or Verein Deutscher Ingenieure. In particular, the terms used here have not the opposite meaning of what the person skilled in the art will derive from the above publications.

Furthermore, the following meanings are the basis for the used terms: fitting is a component for the installation in or at a pipe, conduit or tubing or any other fluid installation for blocking, controlling or influencing of mass flows. A fitting may be designed as one portion only ore with a plurality of portions and is installed at one point in or at the pipe, conduit or tubing. Fittings are, for example and not exclusively: connection devices, connection fittings, main service valves, service fittings, throttle fittings, taps, tap installations, drain fittings, safety fittings, backflow protection devices, adjusting fittings.

fitting assembly assembly of one or more components at least one of which being a fitting, receptacle opening, socket, container or recess for matter.

outlet is an outlet side opening in a housing where a mass flow can flow out. In particular, the opening may be connected to a pipe or another fitting or freely open towards the atmosphere.

axial is the direction of the rotational axis of components which are entirely or partially rotationally symmetric, such as pipes, tubes or elongated housings. In components without rotationally symmetry it designates the main flow direction in a section of the component.

pressure reducer is a fitting for adjusting a selected pressure in downstream components.

passage is a connection enabling mass flows.

inlet is an upstream opening in a housing where a mass flow can flow into. In particular, the opening may be connected to a pipe or another fitting or open freely towards the atmosphere.

housing limitation for matter, components, instruments and measuring devices towards the outside. A housing can be one portion or be constituted of a plurality of connected portions and may be constituted of one or more materials.

releasable removable without destruction.

cartridge container or box for accommodating matter.

radial direction perpendicular to an axial direction, pipe hollow body comprised of cylindrical sections. It usually serves as a pipe line.

shoulder transition between section having different diameters or thicknesses, socket rim or transition portion at an opening valve component for blocking or controlling a fluid flow, valve closing body component which is suitable to close a valve passage.

water installation device which at least partly contains water, such as, for example, pipes, fittings, boilers, heating systems, drinking water heaters, washing machines, dishwashers, sanitary installations or drinking water supplies.

Brief description of the figuress

Fig 1 is a perspective explosive view of a fitting assembly with a pressure reducer -safety valve -cartridge.

Fig.2 is a vertical cross section through the assembly of Figure 1 along a section axis B-B with closed pressure reducer valve.

Fig.3 shows the pressure reducer valve of Figure 2 in greater detail Fig.4 shows the safety valve of Figure 2 in greater detail.

Fig.5 is a vertical section through the assembly of Figure 1 along a section axis A-A, which is rotated by an angle of 90 degrees to the section axis B-B.

Fig.6 is a horizontal section along a section plane F-F in Figure 5.

Fig.7 is a horizontal section along a section plane D-D in Figure 2.

Fig.8 is an explosive view of the assembly of Figure 1 and illustrates the detachment of the cartridge with the safety and pressure reducer valve.

Fig.9 is a vertical section analog to Figure 2 with opened pressure reducer valve.

Fig. 10 is a vertical section analog to Figure 5 with opened safety valve.

Detailed description of an embodiment

Figure 1 shows a fitting assembly generally designated with numeral 10. The fitting assembly 10 comprises a multi-part housing with a connection fitting 12 and a cartridge 14. The connection fitting 12 consists of inexpensive plastic material. It is understood, however, that the connection fitting may also be manufactured of metal, such as brass or copper. The connection fitting 12 has an inlet 16 and an outlet 18 with a backflow preventer 180. Inlet 16 and outlet 18 are push-fit connections. Thereby, it is avoided that the plastic material is damaged as it may be the case if the same forces are exerted with a tool on the plastic material as with metal. Inlet pressure is present in the inlet 16. Outlet pressure is present in the outlet 18.

The fitting assembly 10 is installed in a not-shown pipe, for example, upstream to drinking water heater. The inlet 16 is connected to a water supply. The outlet 18 leads to the boiler of the drinking water heater (not shown). In the present embodiment, the inlet 16 and the outlet 18 are coaxially arranged. It is understood, that they may also adopt different orientations to each other.

In the present embodiment, an optional cold water outlet 32 is provided at the connection fitting 12. Cold water may be made available at the cold water outlet 32. The cold water outlet 32 has a downward orientation in the present embodiment. It is understood, that the cold water outlet 32 and the fitting can also adopt a different orientation. It is ensured by means of the backfl ow preventer 180, that no water from the boiler can flow into the cold water outlet or back into the inlet 16.

The cartridge 14 described below in greater detail comprises, in particular, an inner cartridge housing 30, a safety valve with a valve closing body 90 and a pressure reducer valve with valve closing body 82. The cartridge 14 is located in a housing cap 26, which is rotatably fixed to a housing ring 36 by means of a bracket 182 The housing ring 36 is provided with an outer thread 24 at the lower end in the figures. The housing ring 36 is screwed into a socket 22 with a thread at the connection fitting 12 by means of the outer thread 24. The socket 22 is orientated upwards in the figures, but may also adopt other orientations.

The cartridge 14 provides a lateral drain opening 28. This is shown in Figures 5 and 7. The drain opening 28 can be connected to a drain pipe or a tube or it may be installed above a drain basin, which is connected to the sewerage. The housing cap 26 is inserted into the housing ring 36 and secured in axial direction by means of a bracket 182. Hence, the housing cap 26 and the housing ring 36 can be rotated against each other so that the drain 28 can be adjusted to a desired orientation. Figure 6 illustrated the position of the bracket 182 in the section F-F.

A partition wall 34, 38 is provided inside the connection fitting 12 which separates the inlet 16 from the outlet 18. The partition wall has a vertical first portion 34 and a horizontal second portion 38. A passage is provided in the horizontal second portion 38 of the partition wall 34.

The passage is controlled by a pressure reducer valve in a pressure reducer insert 40 fixed in the housing which is described below in greater detail.

A pressure reducer insert 40 is inserted from above into the socket 22. This can be well recognized in Figure 8. A lower portion 42 of the pressure reducer insert 40 has the diameter of the passage in the horizontal portion 38 of the partition wall. The low portion 42 is provided with an annular groove on its outside accommodating a lower sealing 44. The sealing seals the pressure reducer insert 40 against the partition wall 34,38. This can be well recognized in Figure 3.

The middle portion 46 of the pressure reducer insert 40 has the diameter of a receptacle 20 within the socket 22. The receptacle 20 is circular and forms an integrated portion of the housing of the connection fitting. The middle portion 46 of the pressure reducer insert 40 also has an annular groove on its outside accommodating a middle sealing 48. The sealing 48 seals the outer range between the sealings 44 and 48 downwards against the housing.

The upper portion 50 of the pressure reducer insert 40 has the diameter of the inside of the socket 22 An upper sealing 52 is accommodated in an annular groove on the outside and seals the outer range between the seal ings 48 and 52 downwards against the socket 22.

At its upper end 54 the middle range 46 of the pressure reducer insert 40 has an outwardly slightly increased diameter. The annular projection formed thereby forms a stop by which means the pressure reducer insert 40 rests on the upper rim of the receptacle 20. In such a way, the depth for inserting the pressure reducer insert 40 into the receptacle 20 is well defined. The pressure reducer insert 40 is, therefore, immobile regarding the housing.

An annular diaphragm 60 is clamped between the upper portion 50 of the pressure reducer insert 40 and the lower rim 58 of the housing ring 36. For this purpose, the annular diaphragm 60 is provided with a bulge 64. Furthermore, a sliding ring 62 is arranged between the bulge 64 and the lower rim 58 of housing ring 36. This is well recognizable in Figure 4. The inner edge of the annular diaphragm 60 is also provided with a bulge 66 and connected to an axially moveable subassembly by means of a fixing ring 74. A channel element 72 extends through a central opening provided by the annular diaphragm 60. The channel element 72 is essentially cylindrical with a continuous cavity 104. The fixing ring 74 is screwed onto a guiding sleeve 88. The inner edge of the annular diaphragm 60 is held by means of the fixing ring 74.

An axially moveable subassembly of the pressure reducer valve, well recognizable, for example, in Figure 4, comprises the fixing ring 74, a valve spindle 80, a valve plate 82 with a valve sealing 84 and a fixing ring 78. The subassembly further comprises the cartridge housing 30 and the guiding sleeve 88 with a sealing in the form of a grooved ring 86.

The mentioned components 74, 78, 80, 82, 84, 86 and 88 of the subassembly are tightly connected whereby the subassembly follows each axial movement of the annular diaphragm 60. The annular diaphragm 60 acts as a control diaphragm.

The channel element 72 and the valve closing body 90 of the safety valve are provided within the sleeve 70. The channel element 72 forms the valve seat of the safety valve. The valve closing body 90 is manufactured in a pot-shaped way and is made from a flexible sealing material, which is arranged around an equally pot-shaped leading body 92. The leading body 92 and the valve closing body 90 are fixed at the lower end of a valve spindle 76 by means of a spring plate 68. At its free end, the valve closing body 90 radially extends end outwards and is provided with a bulge 56. The bulge 56 is clamped between a shoulder 136 projecting inwardly at the inner wall of the sleeve 70 and the lower edge of a clamp sleeve 116. The clamp sleeve 116 is screwed into the sleeve 70 from above by means of a thread 152.

The spring plate is preloaded with the force of a spring 94. The other end of the spring 94 rests against a spring abutment 96. The annularly shaped spring abutment 96 has a L-shaped cross section and is screwed onto an adjusting screw 174 by means of a pipe-shaped thread part. The spring abutment 96 is secured against rotation by means of a rotation lock opposite of the inner wall of the clamp sleeve 116. The adjusting screw 174 rests against an inwardly projecting upper edge of the clamp sleeve 116 with an annular projection from below. The adusting screw 174 is rotated by rotating the clamp sleeve 116. A rotation of the adjusting screw 174 moves the spring abutment 96 in axial direction. In this way, the pressure is adjusted to such pressure where the safety valve responds. In order to facilitate the rotation, ribs 176 are preformed to the clamp sleeve 116 which are recognizable in Figure 1.

The channel element 172 rests in the sleeve 70 with a sealing. The sleeve 70 is also essentialy cylindrical and has a larger diameter than the channel element 72 and a smaller diameter than the cartridge housing 30. The sleeve 70 provides an inwardly projecting annular shoulder 118 in the central region. An outer annular projection rests on the annular shoulder 118 at the upper end of the channel element 72. The channel element is provided with a further sealing at its lower end, sealing against the guiding sleeve 88 when the pressure reducer valve is in an upper closed position.

The upper edge of the channel element 72 forms the valve seat for the safety valve. The valve seat cooperates with the valve closing body 90. The valve closing body 90 presses onto the upper edge of the channel element 72 with the safety valve closed. The spring 94 presses onto the valve plate 90 from above, viz, in the closing direction of the safety valve.

The valve spindle 76 extends upwards through the adjusting screw 174 and the annular projection of the clamp sleeve 116 in an axially moveable way. The valve spindle 76 projects upwardly through the floor 170 of a venting grip 168 with its upper end. A securing ring 172 is screwed onto the valve spindle 76 there. Thus, the valve spindle 76 and therefore also the valve closing body 90 of the safety valve, follow an axial movement of the venting grip 168. The safety valve is opened by lifting the venting grip 168. When the venting grip 168 is released, the spring 94 presses it back onto the valve plate 72. The housing cap 26 is designed in two parts and provides a removeable cover 186 at its upper end. The venting grip is readily accessible with the cover 186. At the same time, it protects against unauthorized access and changes of the settings, for example, of the pressure reducer.

The cartrige housing 30 is led between the inner wall of the housing cap 26 and a coaxial sleeve 70. A spring 148 presses onto the upper edge of the cartrifge housing 30. The spring abutment of the spring 148 is formed by a thread ring 184. The thread ring 184 is screwed into the housing cap 26 on a level with the venting grip 168 with an outer thread. The spring pressure of the spring 148 may be adjusted by rotation of the thread ring 184, for example by means of a tool. The spring pressure of the spring 148 will adjust the preload of the pressure reducer valve and thereby the outlet presure which shall be controlled by means of the pressure reducer valve. Typically, the target pressure is already pre-adjusted by the manufacturer.

The valve spindle 80 of the pressure reducer valve is led in the guiding sleeve 88 in an axially moveable way. The upper end 112 of the valve spindle 80 is broadened and forms a stop, which cooperates with an annular shoulder 110 of the guiding sleeve, whereby the valve spindle 80 cannot move further in a downwards direction. This can be well recognized in Figure 3. The guiding sleeve 88, shaped like a funnel in the cross section, extends through the hollow inside of the pressure reducer insert 40 and is sealed against the inside of the upper portion of the pressure reducer insert 40. The guiding sleeve 88 extends to the lower end of the pressure reducer insert 40.

The lower end of the valve spindle 80 extends beyond the lower edge of the guiding sleeve 88 and the lower edge of the pressure reducer insert 40. In such range the valve spindle 80 is provided with a thread 114. A valve closing body in the form of the valve plate 82 is screwed onto the thread 114. The upper side of the valve plate 82 is provided with a wide annular groove. The valve sealing 84 sits in the annular groove. The valve sealing 84 is kept in its position by a fixing ring 78 (Figure 3).

In the figures, and in particular in Figure 3, it can be recognized that a control chamber 108 is formed between the sealings 48 and 52 which is limited at the upper end by the annular diaphragm 60 and at the lower end of the pressure reducer insert 40. The control chamber 108 is connected to the space 104 inside the canal element 72 by passages 106. A side bore hole 144 is provided in the connection fitting 12. The bore hole 144 connects the outlet 18 with outlet pressure to the control chamber 108. The annular diaphragm 60 is, thereby, always exposed to outlet pressure from below. The forces exerted in an axial direction on the canal element 72 by the outlet pressure are compensated since the effective cross sections are the same.

The lower edge of the cartridge housing 30 presses onto the upper edge of the guiding sleeve 88. The spring force of the spring 148 is thereby exerted on the annular diaphragm 60 clamped by the guiding sleeve 88 in an opening direction of the pressure reducer valve in a downwards direction. In the range of the control chamber 108 the annular diaphragm 60 is exposed to outlet pressure from below and to spring power of the spring 148 from above. If the outlet pressure drops, such as upon tapping water in the downstream water installation, the spring power of the spring 148 is larger than the outlet pressure. Thereby, the annular diaphragm is moved downwards together with the entire subassembly with the valve plate 82. The pressure reducer valve will open.

The assembly operates as follows: Figures 2 to 7 show the assembly with closed pressure reducer valve and closed saftey valve. When water is tapped, the outlet pressure drops in the outlet 18 or at the cold water connection 32. Water then flows in the direction of the arrow 154 (Figure 9) into the housing 12 at the inlet 16. The water flows upwards at the wall 34 through a passage 160 in the pressure reducer insert 40. This is illustrated by the arrows 156 and158. If the subassembly with the valve plate 82 is in an upper position at high outlet pressure the pressure reducer valve is closed. This is represented in Figures 2 and 3. The flow is interrupted. No water will flow.

If, as it is the case in Figure 9, the outlet pressure drops, the moveable subassembly with the valve plate 82 described above is moved downwards due to the pressure difference between the outlet pressure and the pressure caused by the spring on the diaphragm 60. Then, the pressure reducer valve opens. Water will flow from the passage 160 through the valve in the direction of the arrows 162 and 164 and through the backflow preventer 180 to the outlet 18. The downstream water installation, such as the boiler of a hot water generator, can be refilled until the set pressure is reached again. The water is further provided at the cold water connection 32.

The outlet pressure is transferred to the control chamber 108 through the control bore hole 144. This is shown in Figure 10. The control chamber 108 is connected to the inside of the canal element 72 by the passage 106. During operation the canal element 72 is closed from above by the valve plate 92. If, however, excess pressure is generated in the water installation downstream of the outlet 18 the outlet pressure will increase. The moveable subassembly will then be in its upper position. The outlet pressure causes an upward force on the valve plate 90. With an excess pressure, illustrated in Figure 10, the force caused by the outlet pressure is larger than the force exerted in the opposite direction by the spring 94. The safety valve will open. Water flows through the inside of the sleeve 70 to the lateral drain outlet 28 until the pressure drops to the value pre-adjusted by the spring 94 at the safety valve. Figure 7 illustrates the lateral position of the drain outlet 28 with a socket 188 at the sleeve 70 which extends outwardly through the openings in the cartridge housing 30 and housind cap 26.

The safety valve with the valve seat forming canal element 72, the valve plate 90 and the spring 94 are completely accommodated inside the sleeve 70. Thereby, a particularly compact arrangement is achieved. If the cartridge or parts of the valves shall be exchanged or serviced the cartridge, as illustrated in Figure 8, it is screwed out of the socket 22 with the thread and can be removed entirely. The adjustment of the pressure reducer valve and the safety valve will remain unaffected The present assembly allows for free rotation of the drain outlet 28 and, as a result, adaptation to the installation environment. The diagram shows the assembly with a longitudinal axis and housing cap 26 directed upwards. It is understood, however, that any other orientation is also possible, achieved through easy rotation about the axis formed by the inlet 16 and outlet 18.

The embodiment described above serves to illustrate the invention claimed in the accompanying claims. Features which are disclosed here together with other features usually may be used by themselves or in combination with other features which are explicitly or implicitly disclosed in the text or in the figuress or in the embodiments. Measures and sizes are indicated by way of example only. The person skilled in the art will select suitable ranges by means of his skills and they must not, therefore, be disclosed in greater detail. The disclosure of a precise embodiment of a feature is not meant to limit the invention to this particular embodiment. The feature shall be meant to include many other variations which are known to the person skilled in the art. Therefore, the invention can be put into practice not only in the form of the embodiments described above, but also by all embodiments within the scope of the enclosed claims. For example, it is possible to change the connection fitting and its connection to the housing in many ways, without deviating from the inventive idea.

The terms "up", "down", "right" and "left" only relate to the accompanying figures. It is understood, that the claimed invention can have a different orientation. The term "comprising" and the term "including" mean, that further components which are not mentioned may be provided. The term "essentially", "mainly" and "mostly" designates all features where the property or the content is more present than others, i.e. more than all other mentioned components or properties of such feature, with two components, for example, more than 50%, unless specifically designated otherwise.

Claims (1)

1. Claims Fitting assembly (10) for a water installation, comprising: (a) a housing (12) with an inlet (16) and an outlet (18), (b) a pressure reducer valve (40, 82, 84) arranged in the flow path between the inlet and the outlet with a first valve closing body (82, 84); (c) a safety valve (72, 90, 92) with a second valve closing body (90, 92), whose moving direction is coaxial to the moving direction of the first valve closing body; and (d) a drain (28) for draining of water which escapes through the opened safety valve with excess pressure; characterized in that (e) the valve closing body (90) of the safety valve is connected to a transmission element for venting the safety valve which extends coaxially to the moving direction of the valve closing body of the safety valve; and (f) the drain provides a drain opening (28) in the housing, which is assembled laterally to the moving direction of the valve closing body (90).Fitting assembly according to claim 1, characterized in that the housing is composed of several parts and comprises a housing part (26) with the drain opening, which is rotatably connected to the remaining housing (12, 36).Fitting assembly according to claim 2, characterized in that the housing part (26) with the drain opening (28) can be inserted into a receptacle (36) of the remaining housing and is secured against movement in the coaxial direction by means of a bracket (182).Fitting assembly according to any of the preceding claims, characterized in that (a) the pressure reducer valve (40, 82, 84) and the safety valve (72, 90, 92) together form a cartridge (14), and (0 the cartridge (14) with the pressure reducer valve (40, 82, 84) and the safety valve (72, 90, 92) is releasable as a whole from the remaining housing from the outside Fitting assembly according to claim 4, characterized in that the cartridge provides a drain opening which is aligned with the drain opening (28) of the rotatable housing part (26) and the cartridge and/or the rotatable housing part provides a dog so that the cartridge follows a turning movement of the rotatable housing part Fitting assembly according to claims 4 or 5, characterized in that the cartridge is provided with a cartridge housing (26) having a thread (24) for sealingly screwing the cartridge into a socket (22) at the housing (12) which forms the receptacle.Fitting assembly according any of the preceding claims, characterized in that the housing (12) is provided with a partition wall (34) in the flow path between the inlet (16) and the outlet (18) the partition wall having an opening which is controlled by the pressure reducer valve (40, 82, 84).Fitting assembly according to claim 7, characterized in that the transmission element for venting the safety valve comprises a valve spindle (76) and a venting grip (168) Fitting assembly according to claim 8, characterized in that the venting grip (168) is assembled within a housing cap (26) and is accessible by means of a sealable opening in the housing cap (26).10. Fitting assembly according to any of the preceding claims, characterized in that the housing provides a cold water connection (32) on the side of the outlet 11 Fitting assembly according to any of the preceding claims, characterized in that a backflow preventer (180) is assembled in front of the outlet.