DE3901431A1 - Fully plastic ball valve made from PTFE or a PTFE compound - Google Patents

Fully plastic ball valve made from PTFE or a PTFE compound

Info

Publication number
DE3901431A1
DE3901431A1 DE19893901431 DE3901431A DE3901431A1 DE 3901431 A1 DE3901431 A1 DE 3901431A1 DE 19893901431 DE19893901431 DE 19893901431 DE 3901431 A DE3901431 A DE 3901431A DE 3901431 A1 DE3901431 A1 DE 3901431A1
Authority
DE
Germany
Prior art keywords
ptfe
expansion
ball
seams
cold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19893901431
Other languages
German (de)
Other versions
DE3901431C2 (en
Inventor
Heinz Battefeld
Werner Boer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PROFLON GmbH
Original Assignee
PROFLON GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PROFLON GmbH filed Critical PROFLON GmbH
Priority to DE19893901431 priority Critical patent/DE3901431A1/en
Publication of DE3901431A1 publication Critical patent/DE3901431A1/en
Application granted granted Critical
Publication of DE3901431C2 publication Critical patent/DE3901431C2/de
Granted legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0657—Particular coverings or materials

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)
  • Valve Housings (AREA)

Abstract

Due to the cold-flow and thermal-expansion values of PTFE, it has hitherto not been possible to produce fully plastic ball valves from this material and the use of PTFE has therefore been limited to the ball seat rings and the lining of a metallic ball-valve housing, although the differing cold-flow and thermal-expansion values may result in separation or destruction of the coating. In our solution to the problem, the actual PTFE ball-valve housing (2) has not only the customary screw holes but also three holes to receive pins made from special steel or, alternatively, PTFE-glass (4) and two or more expansion seams (5a and 5b) recessed in all the way round. In the process of assembly, the two flanges (1a and 1b) are tightened fully by means of screws against the pins (4) in the housing (2). The length of the pins is chosen so that, after this operation, the seams can only be compressed by about 50%. This prevents the factors of cold flow and thermal expansion, which prejudice the functioning of the valve, since they are taken up by these expansion seams. <IMAGE>

Description

1. Problematik und Stand der Technik1. Problems and state of the art

Die Herstellung von Vollkunststoff-Kugelhähnen aus PTFE ist bisher auf Grund der hohen Kaltfluß- und Wärmeausdehnungs-Werte des Werk­ stoffes PTFE nicht möglich.The production of all-plastic ball valves made of PTFE is currently due to the factory's high cold flow and thermal expansion values PTFE not possible.

Der Einsatz des fast universell chemikalienbeständigen Werkstoffes PTFE muß sich deshalb auf die Kugelsitzringe und die Auskleidung eines metallischen Kugelhahngehäuses beschränken.The use of the almost universal chemical-resistant material PTFE must therefore be on the ball seat rings and the lining of a metallic ball valve housing.

Bei mit PTFE ausgekleideten, metallischen Kugelhahngehäuse besteht jedoch durch die unterschiedlichen Kaltfluß- und Wärmeausdehnungs- Werte die Gefahr der Ablösung der Beschichtung, bzw. die Gefahr der Rißbildung in der Beschichtung, wobei dann bei aggressiven Medien eine Leckage auftreten kann.In the case of metallic ball valve housings lined with PTFE however due to the different cold flow and thermal expansion Evaluate the risk of the coating becoming detached or the risk of Cracking in the coating, whereby then with aggressive media a leak can occur.

2. Problemlösung2. Problem solving

Für uns als PTFE-Verarbeiter stellte sich das Problem, die durch den hohen Kaltfluß und den hohen Wärmeausdehdnungskoeffizienten entstehen­ den Maßveränderungen so zu kompensieren, daß die Funktion des Kugel­ hahns nicht beeinträchtigt wird.For us as a PTFE processor, the problem posed by the high cold flow and the high coefficient of thermal expansion arise to compensate for the dimensional changes so that the function of the ball hahns is not affected.

Unsere Schemazeichnung zeigt, wie wir das Problem konstruktiv gelöst haben.Our schematic drawing shows how we solved the problem constructively to have.

Das eigentliche PTFE-Kugelhahngehäuse (2) weist neben den üblichen Verschraubungsbohrungen drei im gleichschenkligen Dreieck angeordnete Bohrungen zur Aufnahme von Stiften aus Edelstahl oder alternativ PTFE- Glas (4), sowie zwei oder mehrere, umlaufend eingestochene Dehnungs­ falten (5a + 5 b) auf.The actual PTFE ball valve housing ( 2 ) has, in addition to the usual screw holes, three holes arranged in the isosceles triangle for receiving pins made of stainless steel or, alternatively, PTFE glass ( 4 ), as well as two or more circumferentially recessed expansion folds ( 5 a + 5 b) on.

Bei der Montage wirkt sich dies wie folgt aus:When installing, this has the following effects:

Die beiden Flansche (1 a + 1 b) werden mittels Verschraubungen auf Block gegen die im Gehäuse (2) befindlichen Stifte (4) gezogen. Die Stifte sind in ihrer Länge so bemessen, daß danach die Falten nur zu ca. 50% zusammengedrückt sind.The two flanges ( 1 a + 1 b) are screwed onto the block against the pins ( 4 ) located in the housing ( 2 ). The length of the pins is such that the folds are then only about 50% compressed.

Die Falten verhindern nun den für die Funktion schädlichen Kaltfluß und/oder eine schädliche Wärmeausdehnung, da beide Erscheinungen von diesen Dehnungsfalten aufgenommen werden.The folds now prevent the cold flow, which is harmful to the function and / or harmful thermal expansion since both phenomena of these expansion folds are absorbed.

Damit ist das Problem gelöst. Die Innovation besteht in den konstruk­ tiven Merkmalen Stiftblock und Dehnungsfalten im Kugelhahngehäuse.This solves the problem. The innovation consists in the construct tive features pin block and expansion folds in the ball valve housing.

Claims (1)

Wir beanspruchen Patentschutz für eine spezielle Konstruktion und Her­ stellung von Kugelhahngehäusen aus PTFE, bzw. PTFE-Compound, bei der Maßveränderungen des Werkstoffes durch Dehnungsfalten in Verbindung mit einer Dehnungsbegrenzung kompensiert werden.We claim patent protection for a special construction and manufacture position of ball valve housings made of PTFE or PTFE compound at the Dimensional changes of the material due to expansion folds in connection can be compensated with an expansion limitation.
DE19893901431 1989-01-19 1989-01-19 Fully plastic ball valve made from PTFE or a PTFE compound Granted DE3901431A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893901431 DE3901431A1 (en) 1989-01-19 1989-01-19 Fully plastic ball valve made from PTFE or a PTFE compound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893901431 DE3901431A1 (en) 1989-01-19 1989-01-19 Fully plastic ball valve made from PTFE or a PTFE compound

Publications (2)

Publication Number Publication Date
DE3901431A1 true DE3901431A1 (en) 1990-08-02
DE3901431C2 DE3901431C2 (en) 1990-12-20

Family

ID=6372363

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19893901431 Granted DE3901431A1 (en) 1989-01-19 1989-01-19 Fully plastic ball valve made from PTFE or a PTFE compound

Country Status (1)

Country Link
DE (1) DE3901431A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232082A1 (en) * 1992-09-25 1994-03-31 Ruesch Willy Ag stopcock
DE19900230A1 (en) * 1999-01-07 2000-08-10 Stuebbe Asv Gmbh Shut-off valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH382509A (en) * 1962-01-10 1964-09-30 Raybestos Manhattan Inc Internally lined rotary valve

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH382509A (en) * 1962-01-10 1964-09-30 Raybestos Manhattan Inc Internally lined rotary valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4232082A1 (en) * 1992-09-25 1994-03-31 Ruesch Willy Ag stopcock
DE19900230A1 (en) * 1999-01-07 2000-08-10 Stuebbe Asv Gmbh Shut-off valve
DE19900230C2 (en) * 1999-01-07 2001-03-22 Stuebbe Asv Gmbh Shut-off valve

Also Published As

Publication number Publication date
DE3901431C2 (en) 1990-12-20

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee