1、 STD.BS1 BS EN 12756-ENGL 2001 M Lb24bb9 0893234 343 BRITISH STANDARD Mechanical seals - Principal dimensions, designation and material codes The European Standard EN 127562000 has the status of a British Standard ICs 21.140 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PEBMITTED BY COPYRIGHT LAW 3s E
2、N 12 756200 1 STDOBSI ES EN 1275b-ENGL 2001 Lb2Ybb7 0873235 28T BS EN 127562001 been prepared under the direction of the Engineering AmdNo. Date Sector Committee, was published under the authority of the Standards Commiaee and comes into effect on 16 February 2001 8 BSI 02-2001 ISBN O 580 35768 6 Na
3、tional foreword Comments This British Standard is the officd English language version of EN 127562000. The UK participation in its preparation was enWted by Technical Committee MCW6, Pumps and pump testing, to Subcommittee MCE/6/2, Dimensions and technical specifications, which has the responsibilit
4、y to: - aid enquirers to understand the te* - present to the responsible European committee any enquiries on the - monitor related intemational and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A list of organization
5、s represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI StanE I 1 1 130 I 135 1 I 90 1 I 95 I 100 I 119 I 124 135 140 65 rYPe B 1
6、0,5 10,5 40 - 18 1,5 42,5 45 - 1201 I 2 III I I I 295 III 3 1) In order to provide a safe clearance between the mechanical seal and the seal housing, the dimensions ds are recommended as thi maximum dimensions. I 2) The manufacturer of the mechanical seal may supply a shorter seal than that which co
7、rresponds to dimension 1,. In this case, thl difference in lenghts should be compensated by use of a spacer, which should be supplied by the seal manufacturer. For materiais sel Position 5 of material key (see clause 5). 3) Those dimensions are not defined. They may vary, depending on the manufactur
8、er of the mechanical seal and should therefore b obtained from the relevant suppliers literature. STD*BSI BS EN L275b-ENGL 2001 E Lb24bb9 0893243 356 Page 8 prEN 12756:2000 3.4 Surface condition Surface conditions shall comply to the values given in Table 2. Table 2 - Surface condition I Secondary s
9、eal material I Elastomersi) I Ra2,5 1 Ra0,8 I Non-elastomers or optional use of Ra 1,6 Ra 0,20 rubbers and latices, refer to IS0 1629. I I Figure 4 - Surface location STD-BSI BS EN 12756-ENGL 2OOL lib24bb9 0893244 292 Page 9 prEN 12756:2000 4 Standard designation This section sets out a coding syste
10、m for use in designating single and multiple seals by seal type, by nominal dimension, by orientation, and by the classes of materials used. The system is intended to be typical of those in current use and will help in the transfer of information between suppliers and users. It is not intended to fu
11、lly and unambiguously identify facets of a seal assembly. It is intended to help to identify and group seals for recording purposes and for subsequent analysis. NOTE It is not a requirement of this European Standard that seals are marked with a designation derived from this system. 4.1 Schematic rep
12、resentation of a designation for single mechanical seals Term Standard Characteristics Abbreviations Material key - uuuuuuu- UUUUU Mechanical seal EN 12756 or for short: GLRD I I- N=N I I K=K Version Type u=u B=B Nominal diameter Nominal diameter d of the mechanical seal (A three-digit number on pri
13、nciple, for two-digit numbers for d a preceded zero is to be inserted) Direction of rotation of the mechanical seal t I I R Right hand rotation the seat L Left hand rotation from the seat S Capability of rotation in either direction Retention against rotation of the seat O without retention 1 with r
14、etention = clockwise rotation of the seal unit when viewed from = anticlockwise rotation of the seal unit when viewed 4.2 Example of designation for a single mechanical seal Designation of a single mechanical seal of normal design (N) in form U with nominal diameter d, = -3 mm (04 ), right hand rota
15、tion (R), with securing of the atmospheric side seat against rotation (l), material of the seal face Chromium cast steel S, material of the seat Carbon, resin-impregnated B, material of flexible elements Fluorocarbon rubber V, material of the spring CrNiMo steel G and material of other components Cr
16、NiMo steel G: Mechanical seal EN 12756-NU043R1-SBVGG or for short: GLRD EN 12756-NU043Rl-SBVGG STD-BSI BS EN 1275b-ENGL 2001 3624669 0693245 129 Page 10 prEN 12756:2000 4.3 Schematic representation of designation for multiple mechanical seals (D1 Back-to-back arrangement)4) Term Standard Characteris
17、tics I Abbreviation Material key -u u u u u u u u- u u u u u u u u EN Mechanical seal %:sphereside B=B Nominal diameter Nominal diameter d, of the mechanical seal (A three digtnumber on principle, for Wo-digit numbers for d a preceded zero is to be inserted) Direction of rotation of the mechanical s
18、eal R Right hand rotation L Left hand rotation S Capability of rotation in either direction = clockwise rotation of the seal unit at the atmosphere = anticlockwise rotation of the seal unit at the atmosphere side when viewed from the seat side when viewed from the seat Retention against rotation of
19、the seat on atmosphere side andlor the seat on product side O without retention 1 with retention of the seat on the abnosphere side 2 with retention of the seat on the product side 3 with retention of the seat on the atmosphere side and of the seat on the product side Retention of the seat on the pr
20、oduct rida against axial movement O without retention D with retention t (see clause 5) Positions 1 to 5 for product side Positions 1 to 3 for atmosphere side 4.4 Example of designation for a multiple mechanical seal (Dl) Designation of a multiple mechanical seal (Dl) type UU (UU) with nominal diame
21、ter d, = 43 mm (043), capability of rotation in either direction (S), with retention against rotation of the seat on atmosphere side (l), with retention against axial movement of the seat on the product side (D) and with the material key in accordance with clause 5 (VBVG GSBV) : Mechanical seal EN 1
22、275-UUO43Sl D-VBVGGSBV or for short: GLRD EN 1275-UUO43Sl D-VBVGGSBV NOTE multiple mechanical seals (Dl) with shorter length the total length is not standardized. Multiple mechanical seals (D1 Back-to-back arrangement) consist of single mechanical seals, version K. For 4, see IS0 9905 and IS0 9908 S
23、TDoBSI BS EN L275b-ENGL 2001, Lb24bb9 089324b Ob5 Page 11 prEN 12756:2000 5 Material key Pos. 4 Pos. 5 Material of seal face Material of seat Material of flexible elements Material of springs Material of other components (excluding cover and shaft sleeve) Table 3 - Explanation of symbols for materia
24、l versions I Position l/Position 2 Material) for rubbing surfaces Seai face2)/seat A Carbon, metal-impregnated 3 Carbon, resin-impregnated 2 Othercarbons Metals 3 Carbon steel E Cr steel F CrNi steel G CrNiMo steel H Metals with carbide coatings K Hard-coating, metallic M High-nickel alloy N Bronze
25、P Grey cast iron R Alloyed grey cast iron S Cr cast steel T Other metals Carbide (Tungsten carbides U, silicon carbides Q, other carbides J) U1 Tungsten carbides, Co-bonded U2 Tungsten carbides, Ni-bonded U3 Tungsten carbides, CrNiMo-bonded Ql Sic Q2 Sic-Si Q3 Sic-C-Si, composite Q4 C-Sic, surface-s
26、iliconised J Other carbides Metal oxides V Aluminium oxide W Chromium oxide X Other metal oxides Plastics (PTFE, reinforced Y, other plastics Z) Y1 PTFE, glass-fibre reinforced Y2 PTFE, carbon reinforced Z Other plastics 1) For more detailed data refer to mechanic; Position 3 daterial for flexible e
27、lements3) ilastomers, not sheathed4) b Butyl rubber (IIR) I Ethylene propylene rubber (EPPM) C Perfluoro rubber 4 Chloroprene rubber (CR) 3 Nitrile rubber (NBR) Silicon rubber (MVQ) I Fluoro rubber (FPM) ( Other elastomers :lastomers, sheathed d ElastomerdPTFE sheathed Jon-elastomers Graphite I Othe
28、r non-elastomers r PTFE Jarious materials J various materials for flexible elements ;cals manufacturers literature Position 4/Position 5 laterials) for other components, such as ,rings, metal bellows5) bxcludinp covers and shaft sleeves) Carbon steel Cr steel CrNi steel CrNiMo steel High-nickel allo
29、y Copper-tin alloy (Bronze) Other materials 2) Seal face = spring loaded axially sliding ring of the mechanical seal 3) Flexible elements are seals which seal the rotating components on the shafshafl sleeve and the stationary components in the seal housingend cover, including a bellows when applicab
30、le 4) Refer to table 2, footnote) 5) For bellows seals any component missing should be designated with a dash -a STDOBSI BS EN Ii275b-ENGL 2001 Lb24bb9 0893247 TTIi BS EN 12756:2001 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body resp
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