# US 5,341,843 A · Plumbing and heating pipe system for water supply purposes, made either completely or mainly of plastic material, especially of polypropylene

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- Number: US 5,341,843 A
- Document ID: US5341843A
- Status: Granted
- Kind: A
- Application number: 08/089,718
- Filed: 1993-07-09
- Granted: 1994-08-30
- Earliest claimed: 1990-11-15
- Assignees: Rafeld Kunststofftechnik GmbH u. Co. KG.
- Inventors: Karl Rafeld
- Web page: https://patentgrep.com/patent/US5341843A

## CPC

- F16K 27/02: of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06)
- B29C 37/0082: {Mechanical anchoring (B29C66/303 takes precedence)}
- B29C 65/7802: {Positioning the parts to be joined, e.g. aligning, indexing or centring}
- B29C 66/522: {Joining tubular articles (B29C66/53241 takes precedence)}
- B29C 66/5229: {involving the use of a socket}
- B29C 66/5344: {said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends (B29C66/5346 takes precedence)}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 70/682: {Preformed parts characterised by their structure, e.g. form}
- F16L 47/24: for joints between metal and plastics pipes
- F24D 3/1058: {disposition of pipes and pipe connections}
- F24D 19/0009: {In a two pipe system}
- B29C 66/1122: {Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence)}
- B29C 66/5223: {for forming corner connections or elbows, e.g. for making V-shaped pieces}
- B29C 66/52241: {with two right angles, e.g. for making T-shaped pieces}
- B29K 2023/12: {PP, i.e. polypropylene}
- Y10T 137/6851: With casing, support, protector or static constructional installations
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F24D: DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR (using steam or condensate extracted or exhausted from steam engine plants for heating purposes F01K17/02)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A plumbing and heating pipe system for water supply purposes, made either completely or mainly of plastic material, especially of polypropylene, said system being provided with metallic connecting sleeves as well as reducers for connecting the plastic pipes to fittings of metallic materials, and being provided with shut-off valves made of plastic material and having a plastic-encased metallic valve seat for mounting in pipe lines, and being provided with pressure-type screw connections for the pipes to be joined to each other and with reducers for connection to radiators, wherein a welding device having an arrangement for equalizing the lengths of the plastic pipes is used to weld parallel plastic pipes.

## Claims

### Claim 1

Plumbing and heating pipe system for water supply purposes, made substantially of plastic material, including shut-off valves of plastic material having a plastic-sheathed metallic valve seat for installation in pipelines, and including two serially disposed pipe connecting sleeve pieces and an internally threaded valve body receptacle therebetween to form said valve seat, the valve body adapted to be screwed into the internal screw thread of said valve body receptacle, the improvement comprising that the metallic valve body receptacle is a rotary body of cylindrical contour which is provided on a portion of its cylindrical outer surface with flow bores which extend transversely to its longitudinal axis and can be closed by means of the valve body, while on other portions of its cylindrical outer surface it is provided with anti-twist means and with sealing members against leakage of fluid from the pipe connecting sleeve pieces.

### Claim 2 (depends on 1)

The system claimed in claim 1, characterized in that the valve body receptacle is provided on its cylindrical outer surface in the vicinity of its opening with continuous seal grooves into which the plastic material penetrates when the valve body receptacle is plastic-encased.

### Claim 3 (depends on 1)

The system claimed in claim 1, characterized in that the receptacle bottom which is opposite the opening of the valve body receptacle is provided on the outside thereof with recesses in the form of slots and cut-outs into which the plastic material penetrates to form anti-twist means.

### Claim 4 (depends on 1)

The system claimed in claim 1, characterized in that in the vicinity of the bottom of the valve body receptacle an annular groove is formed on the cylindrical outer surface of said receptacle into which the plastic material penetrates to provide a connection of high tensile strength between the plastic material and the valve body receptacle.

### Claim 5 (depends on 2)

The system claimed in claim 2, characterized in that the cross-section of the seal grooves are V-shaped.

### Claim 6

Plumbing and heating pipe system for water supply purposes, made substantially of plastic material, including pressure-type screw connections especially for hot water and aggressive liquids, the improvement comprising an internally threaded union nut with a bottom-side annular flange provided with a central opening for the passage of one or two liquid pipes therethrough and intended to receive an end flange of said one liquid pipe, and comprising an externally threaded nut which surrounds the other one of said liquid pipes and is adapted to be screw-connected with said union nut and the lower end of which is adapted to be screwed against an end flange of said other liquid pipe, said end flange of said other liquid pipe engaging the end flange of said one liquid pipe.

### Claim 7 (depends on 6)

The system claimed in claim 6, characterized in that an O-ring seal is provided in at least one of said two end flanges to ensure the tightly sealed connection between the two liquid pipes.

### Claim 8 (depends on 6)

The system claimed in claim 6, characterized in that the outer circumference of the end flange of said one liquid pipe together with the outer circumference of the end flange of said other liquid pipe engages the inner circumferential surface of the union nut when the two nuts are screwed together.

### Claim 9 (depends on 6)

The system claimed in claim 6, characterized in that the outer diameter of said union nut corresponds to the outer diameter of said nut.

### Claim 10

Plumping and heating pipe system for water supply purposes, made substantially of plastic material, including reducers for connecting radiators in rooms, especially for installation of the heating pipes so as to be concealed by a skirting board, consisting of two interconnected pipe pieces having ends and which follow the extension of the skirting board and of which one pipe piece is connectable to the heating water flow while the other one is connectable to the heating water return, the improvement comprising that the two interconnected pipe pieces are disposed one above the other and the upper pipe piece includes the two pipe unions for the heating water flow and return, respectively, of which the one pipe union bridges the cross-section of the upper pipe piece inside the contour of said pipe piece by means of a bridging passageway which opens into the lower pipe piece inside the contour thereof.

### Claim 11 (depends on 10)

The system claimed in claim 10, characterized in that the two inter-connected pipe pieces extend parallel to each other and are provided at their ends with connecting sleeves for the heating pipes.

### Claim 12 (depends on 10)

The system claimed in claim 10, characterized in that the clear width of the bridging passageway occupies approximately half the flow cross-section of the upper pipe piece.

### Claim 13 (depends on 10)

The system claimed in claim 10, characterized in that the outer wall of the bridging passageway which faces away from the cross-sectional centres of the pipe pieces extends approximately tangentially to the cross-section of the lower pipe piece and opens into the same.

### Claim 14 (depends on 10)

The system claimed in claim 10, characterized in that the pipe unions for the heating water flow and return are adapted to be welded to straight connecting members the free ends of which carry a union nut for connection to a valve.

### Claim 15

Plumping and heating pipe system for water supply purposes, made substantially of plastic material, including an arrangement for a welding device for welding parallel plastic pipes having ends and by means of which arrangement the ends of the plastic pipes can be equalized as to their lengths, the improvement comprising a straddling body adapted to be disposed on the parallel plastic pipes and having an upwardly pivotable bracket member which in its upwardly pivoted position can be pivoted downwards transversely to the longitudinal pipe axis across the pipe ends and is provided with an end plate for abutment of the pipe ends thereat.

### Claim 16 (depends on 15)

The system claimed in claim 15, characterized in that the straddling body is formed with approximately semi-circular recesses which extend in longitudinal direction of the pipes at the spacing of the parallel pipes, said recesses having a diameter which is matched with the outer diameter of the pipes and having the pipes to be welded seated therein.

### Claim 17 (depends on 15)

The system claimed in claim 15, characterized in that the straddling body is a parallelepiped the underside and the two opposed side faces of which include said recesses and to the smaller end faces thereof, which limit the two side faces, the bracket member is pivotally mounted by means of pivots and is adapted to be pivoted by about 90.degree..

### Claim 18 (depends on 17)

The system claimed in claim 17, characterized in that the bracket member is an L-section member the short leg of which forms the end plate and the long leg of which is formed with a central recess which is limited by two lateral arms supported by said pivots.

### Claim 19 (depends on 18)

The system claimed in claim 18, characterized in that the support of the lateral arms relative to the end faces of the straddling body is arranged so that the surface of the long leg of the U-section of the bracket member in the downwardly pivoted state lies in the plane of the top of the straddling body.

### Claim 20 (depends on 15)

The system claimed in claim 15, characterized in that a screw member is passed perpendicularly through the top of the straddling body and exits between the two parallel pipe from the underside of the straddling body where it carries a transverse piece which is adapted to be urged by the screw member against the pipes to clamp the straddling body to the pipes by means of a nut.