1、BRITISH STANDARDBS EN 50216-8:2005Incorporating amendment no. 1Power transformer and reactor fittings Part 8: Butterfly valves for insulating liquid circuitsThe European Standard EN 50216-8:2005, incorporating amendment A1:2006, has the status of a British StandardICS 23.060.30; 29.180g49g50g3g38g50
2、g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Fri Apr 13 03:16:50 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 50216-8:2005This
3、British Standard was published under the authority of the Standards Policy and Strategy Committee on 21 February 2006 BSI 2007ISBN 0 580 47665 0National forewordThis British Standard was published by BSI. It is the UK implementation of EN 50216-8:2005, incorporating amendment A1:2006.The start and f
4、inish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“.The UK participation in its preparation was entrusted to Technical Committ
5、ee PEL/14, Power transformers.A list of organizations represented on PEL/14 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot
6、 confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date Comments16826 31 January 2007 See national forewordLicensed Copy: Wang Bin, na, Fri Apr 13 03:16:50 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN 50216-8 NORME EUROPENNE EUROPISCHE NORM May 2005
7、 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved
8、 worldwide for CENELEC members. Ref. No. EN 50216-8:2005 E ICS 23.060.30; 29.180 English version Power transformer and reactor fittings Part 8: Butterfly valves for insulating liquid circuits Accessoires pour transformateurs de puissance et bobines dinductance Partie 8: Vannes papillon pour circuits
9、 liquides isolants Zubehr fr Transformatoren und Drosselspulen Teil 8: Drosselklappen fr Rohrleitungs-kreise mit Isolierflssigkeit This European Standard was approved by CENELEC on 2004-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condition
10、s for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three
11、official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical
12、committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. + A1 October 2
13、006 Licensed Copy: Wang Bin, na, Fri Apr 13 03:16:50 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 50216-8:2005 2 Foreword This European Standard was prepared by the Technical Committee CENELEC TC 14, Power transformers. The text of the draft was submitted to the Unique Acceptance Procedure and was a
14、pproved by CENELEC as EN 50216-8 on 2004-12-01. This EN 50216-8 is to be read in conjunction with EN 50216-1. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-12-01 latest
15、 date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-12-01 _ Foreword to amendment A1This amendment to the European Standard EN 50216-8:2005 was prepared by the Technical Committee CENELEC TC 14, Power transformers. The text of the draft was submitted to the
16、Unique Acceptance Procedure and was approved by CENELEC as amendment A1 to EN 50216-8:2005 on 2006-09-01. The following dates were fixed: latest date by which the amendment has to be implementedat national level by publication of an identical national standard or by endorsement (dop) 2007-09-01 late
17、st date by which the national standards conflicting with the amendment have to be withdrawn (dow) 2009-09-01 _ Licensed Copy: Wang Bin, na, Fri Apr 13 03:16:50 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 EN 50216-8:2005 Contents 1 Scope 4 2 Normative references 4 3 Requirements and characteristics
18、.4 3.1 Description 4 3.2 Operating characteristics.4 3.3 Components characteristics4 4 Assembly arrangements and dimensions .6 4.1 Types of assembly 6 4.2 Overall dimensions6 5 Dimensions and types of gaskets, dimensions of gasket seats 6 5.1 General6 5.2 Gaskets and gasket material.6 5.3 Admissible
19、 operating conditions7 5.4 Design criteria for gasket seats Choice of flange gaskets .7 6 Performances 9 6.1 Tightness of the mounted valve 9 6.2 Tightness of the butterfly blade .9 6.3 Operating torque .9 6.4 Maximum working overpressure with the butterfly valve in open and closed position 9 7 Test
20、s10 7.1 Tightness of the mounted valve 10 7.2 Tightness of the butterfly blade .10 7.3 Operating torque .10 7.4 Maximum working overpressure with the butterfly valve in open and closed position 10 8 Supply conditions.10 Figure 1 Assembly layout of butterfly valves type A1 and A2 11 Figure 2 Assembly
21、 layout of butterfly valves type B1 and B2 12 Figure 3 Assembly layout of butterfly valves type C1 and C213 Figure 4 Dimensions of butterfly valves type A1 and A2 .14 Figure 5 Dimensions of butterfly valves type B115 Figure 6 Dimensions of butterfly valves type B216 Figure 7 Dimensions of butterfly
22、valves type C117 Table 1 Flange gasket types and dimensions mm .8 Table 2 Maximum admissible leakage value.9 Table 3 Operating torque.9 Licensed Copy: Wang Bin, na, Fri Apr 13 03:16:50 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 50216-8:2005 4 1 Scope This standard covers the butterfly valves used
23、on the pipelines, in which the insulating liquid of power transformers or reactors flows, in order to allow the replacement of components, without removing the whole or a large amount of the insulating liquid from the conservator and the tank. This standard defines the general overall dimensions and
24、 some functional and manufacturing characteristics to guarantee interchangeability. 2 Normative references Addition to EN 50216-1: EN 1092-1 2001 Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 1: Steel flanges 3 Requirements and characterist
25、ics 3.1 Description The main components of a butterfly valve are: a flanged body, which allows the mounting on the pipe according to one of the assembly layouts listed in Clause 4. The free passage in the body gives the nominal dimension of the valve, which should be preferably within the range show
26、n in the attached dimension tables. Except for the few exceptions shown in the tables, the flanged body has PN10 fixing dimensions, according to EN 1092-1; the butterfly which opens or shuts the opening of the body; the drive assembly, which allows to open or shut the butterfly and to block it in th
27、e open or closed position. 3.2 Operating characteristics The butterfly valves are intended to be mounted on the pipelines in any position and with any orientation. They shall be capable to withstand mechanically to a overpressure of 200 kPa either on the flanged body or on the butterfly in closed po
28、sition, indifferently in both directions, without any obstacle to the operation of the butterfly. The sealing of the butterfly should not be subject to ageing, so that a metal to metal design is preferable, in order to avoid components subject to ageing problems such as rubber gaskets. The operation
29、 of opening or shutting the butterfly must be done using only spanners. All the characteristics are related to valves having the butterfly in fully open or fully closed position. 3.3 Components characteristics 3.3.1 Flanged body The flanged body must be metallic, free from porosity or defoliation wh
30、ich may cause leakage; it is preferable to use forged steel bodies or bodies cut from sheet steel or big bars; cast bodies must be individually tested for tightness. Licensed Copy: Wang Bin, na, Fri Apr 13 03:16:50 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 EN 50216-8:2005 The faces of the flanged
31、 body, in contact with the flanges of the pipeline or of the component to be connected, have a seat for an O-Ring gasket. Recommended dimensions of gaskets and gasket seats are shown in the tables “Gasket Seat Dimensions“ in Clause 5; other dimensions may be used upon agreement between manufacturer
32、and purchaser. 3.3.2 Butterfly The butterfly shall be capable to perform in the long run its sealing properties within the maximum permitted leakage values and to resist mechanically to the maximum permitted overpressure. 3.3.3 Drive assembly The drive assembly shall be completely contained within t
33、he thickness of the flanged body up to the limit of the flange diameter when the butterfly is in open or closed position, assure the mechanical resistance necessary to withstand the test pressure on the closed butterfly; for ND 125 mm the butterfly should be guided also on the lower part, indicate t
34、he butterfly position with standard symbols or in writing, open the butterfly anticlockwise, shut the butterfly clockwise, have full oil tightness towards the outside of the pipeline; the gaskets of the drive assembly, if any, must be easily replaced in case of gasket failure or wear, be capable to
35、withstand, eventually with the help of an adequate mask, to all the surface protection process of the transformer tank, like sandblasting and painting, particularly for the radiator valves of the weld-on type, preferably be arranged to accept a padlock (or a lead seal) in open and closed position, t
36、o avoid unattended operations by non authorized personnel. 3.3.4 Protection against corrosion All the screws exposed to the atmosphere shall be of stainless steel or brass . The butterfly valves and their components shall be supplied adequately protected against the corrosion which may occur during
37、transport and warehousing. The body of the valves to be mounted between flanges shall be zinc-plated and passivated (cold process), with the function of protection against corrosion, and to allow an easy painting process. The bore of the valve shall be cleared of the zinc-plating before assembling.
38、The body of the welding type radiator valves shall be self colour. ! “Licensed Copy: Wang Bin, na, Fri Apr 13 03:16:50 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 50216-8:2005 6 4 Assembly arrangements and dimensions 4.1 Types of assembly The butterfly valve types differ in the way they are assembl
39、ed on the pipeline; the following layouts are foreseen: Assembly by welding: o Assembly between tank wall and flange: o Types B1 (circular flange with recessed body) and B2 (square flange with recessed body) - assembly layout according to Figure 2 b) and c); Assembly between two flanges: o Types B1
40、(circular flange with recessed body) and B2 (square flange with recessed body) - assembly layout according to Figure 2 a), o Types C1 (circular flange with full thickness body) and C2 (square flange with full thickness body) - assembly layout according to Figure 3 a). 4.2 Overall dimensions Butterfl
41、y valves dimensions are ranged by nominal diameter (ND). Standardized nominal diameters are 25 mm, 50 mm, 80 mm, 100 mm, 125 mm, 150 mm, 175 mm, 200 mm, 250 mm and 300 mm. Overall dimensions are as follows: for types B1 (circular flange with recessed body) Table 5 in Figure 5, for types B2 (square f
42、lange with recessed body) Table 6 in Figure 6, for types C1 (circular flange with full thickness body) Table 7 in Figure 7, for types C2 (square flange with full thickness body) Table 8 in Figure 8. 5 Dimensions and types of gaskets, dimensions of gasket seats 5.1 General Gaskets have to be consider
43、ed parts subjected to wear; therefore their replacement shall be made as easy as possible. The gasket material is furthermore the main responsible in complying with the admitted operating conditions. 5.2 Gaskets and gasket material Gaskets shall be wherever possible standard O-Ring gaskets. Standard
44、 gasket material is nitrile rubber (NBR); other gaskets materials for operating conditions outside the operating range of nitrile rubber may be used upon agreement between supplier and purchaser. Types A1 (short type), A2 (mid type) and A3 (long type) - assembly layout according to Figure 1; !“for t
45、ypes A1 (short type), A2 (mid type) and A3 (long type) Table 4 in Figure 4, ! “Licensed Copy: Wang Bin, na, Fri Apr 13 03:16:50 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 7 EN 50216-8:2005 Gaskets should be colour coded according to gasket material to avoid confusions; colour of gaskets of nitrile r
46、ubber is black. 5.3 Admissible operating conditions Operating conditions depend mainly from the type of the gasket material. Standard nitrile rubber gaskets (NBR) shall comply with the following operating conditions. Ambient conditions: o ambient temperature -25 C to +40 C, o relative humidity 95 %
47、at 20 C 80 % at 40 C 50 % at 50 C. Insulating liquid and its temperature: o mineral oil -25 C to +115 C, o silicone oil -25 C to +115 C. 5.4 Design criteria for gasket seats Choice of flange gaskets The gasket references and the gasket seat dimensions indicated by the following Table 1 are not compu
48、lsory; other gasket references and gasket seat dimensions can be agreed upon between manufacturer and purchaser. Following criteria have been adopted in designing the gasket seats of Table 1: gaskets are to be centred either on the internal or external diameter of the gasket seat for easier mounting
49、; internal gasket seat diameter shall allow to adopt standard slip-on flanges on pipeline; radial compression of gasket tore shall be uniformly 33 % ( 2 %) of the tore diameter; gasket seat cross section and volume shall be from a minimum of 12 % to a maximum of 17 % higher than the gasket cross section and volume. Exceptions to these criteria are indicated as notes to the table. Licensed Copy: Wang Bin, na, Fri
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