1、March 2008DEUTSCHE NORM English price group 17No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.060.40!$LXj“1415371ww
2、w.din.deDDIN EN 88-2Pressure regulators and associated safety devices for gas appliances Part 2: Pressure regulators for inlet pressures above 500 mbar up to andincluding 5 barEnglish version of DIN EN 88-2:2008-03Druckregler und zugehrige Sicherheitseinrichtungen fr Gasgerte Teil 2: Druckregler fr
3、Eingangsdrcke ber 500 mbar bis einschlielich 5 barEnglische Fassung DIN EN 88-2:2008-03www.beuth.deDocument comprises 47 pagesDIN EN 88-2:2008-03 2 Start of validity This standard is valid from 1 March 2008. National foreword This standard includes safety requirements in clauses 6 and 7. This standa
4、rd has been prepared by Technical Committee CEN/TC 58 “Safety and control devices for gas burners and gas-burning appliances” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Heiz- und Raumluft-technik (Heating and Ventilation Techno
5、logy Standards Committee), Technical Committee NA 041-03-16 AA Mechanische Sicherheits- und Regeleinrichtungen fr wrmeerzeugende Gerte und Anlagen. DIN EN 88 has been replaced by DIN EN 88-1 and supplemented by DIN EN 88-2, where Part 1 applies to inlet pressures up to and including 500 mbar. In add
6、ition, this document cites “General requirements for safety and control devices for gas burners and gas-burning appliances” according to EN 13611 and supplements or modifies the corresponding clauses of EN 13611. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 88-2November 2007ICS 23.060.40English
7、 VersionPressure regulators and associated safety devices for gasappliances - Part 2: Pressure regulators for inlet pressuresabove 500 mbar up to and including 5 barRgulateurs de pression et dispositifs de scurit associspour appareils gaz - Partie 2: Rgulateurs de pressionpour pression amont suprieu
8、re 500 mbar et infrieure ougale 5 barDruckregler und zugehrige Sicherheitseinrichtungen frGasgerte - Teil 2: Druckregler fr Eingangsdrcke ber500 mbar bis einschlielich 5 barThis European Standard was approved by CEN on 8 May 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulati
9、ons which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This Europe
10、an Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the nationa
11、l standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and Unite
12、d Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 88-2:2007: EEN 88
13、-2:2007 (E) 2 Contents Page Foreword. 4 Introduction 5 1 Scope 6 2 Normative references . 6 3 Terms and definitions. 7 3.1 Pressure regulator 7 3.2 Components 7 3.3 Safety shut-off devices. 9 3.4 Control variables. 10 3.4.1 Reference values. 10 3.4.2 Variables in the controlling process. 11 3.4.3 Po
14、ssible values of all variables . 11 3.4.4 Terms pertinent to the controlled variable. 12 3.5 Operating features in stable conditions . 12 3.6 Features pertinent to accuracy 14 3.7 Features pertinent to lock-up behaviour 15 3.8 Further functional terminology 16 3.8.1 Pressures pertinent to design of
15、gas pressure regulator. 16 4 Classification. 17 5 Units of measurement and test conditions 17 5.1 Units of measurement 17 5.2 Test conditions 17 6 Construction requirements 18 6.1 General. 18 6.2 Construction 18 6.2.1 General. 18 6.2.2 Breather holes . 18 6.2.3 External visual Indication of the posi
16、tion of the closure member. 18 6.2.4 Parts transmitting actuating forces 19 6.2.5 Pressure adjustment. 19 6.3 Materials. 19 6.3.1 General. 19 6.3.2 Springs. 19 6.3.3 Requirements for elastomers (including vulcanized rubbers). 19 6.4 Gas connections . 19 6.4.1 General. 19 6.4.2 Connection sizes. 19 6
17、.4.3 Threads 20 6.4.4 Pressure test nipples (applicable only for outlet connections operating at 7 Performance requirements 20 7.1 General. 20 7.2 Strength of housings 20 7.2.1 Requirement 20 7.2.2 Performance test. 21 7.3 External and internal leak tightness . 21 DIN EN 88-2:2008-03 3.8.2 nominal p
18、ressure 17 3.8.3 operating temperature range 17 500 mbar) 20 EN 88-2:2007 (E) 3 7.4 Torsion and bending. 21 7.5 Control classification 21 7.5.1 General. 21 7.5.2 Control classifications for pressure regulators. 21 7.5.3 Safety shut-off device accuracy group for over-pressure 22 7.6 Safety devices .
19、22 7.6.1 Over-pressure safety shut-off device . 22 7.6.2 Under-pressure safety shut-off devices . 23 7.6.3 Bypass 23 7.6.4 Response time. 23 7.7 Durability of performance 23 7.7.1 Pressure regulator 23 7.7.2 Safety slam-shut device . 23 8 Marking, installation and operating instructions. 24 8.1 Mark
20、ing 24 8.2 Installation, operating and servicing instructions. 24 8.3 Warning notice 25 regulators. 26 A.1 Main components of a pressure regulator . 26 A.2 Main components of a gas safety shut-off device. 27 6.4.3) . 29 C.1 General. 30 C.2 Apparatus and test rig 30 C.3 Performance tests under stable
21、 conditions. 32 C.3.1 General. 32 C.3.2 Determination of a performance curve. 34 C.3.3 Determination of the lock-up pressure. 35 C.3.4 Regulator accuracy class. 36 C.4 Safety shut-off device accuracy group. 37 C.4.1 General conditions and apparatus 37 C.4.2 Test at ambient temperature 39 C.4.3 Test
22、at the limit temperatures between 0 C and 60 C. 39 C.4.4 Verification of the upper limit of the highest set range 40 C.4.5 Response time. 40 C.5 Durability of performance 41 C.5.1 General. 41 C.5.2 Pressure regulator 41 C.5.3 Safety shut-off devices. 42 Requirements of EU Directive 90/396/EEC. 43 Bi
23、bliography . 45 DIN EN 88-2:2008-03 Annex A (informative) Main components for direct acting and pilot controlled pressure Annex B (informative) Use of ISO 7-1 and EN ISO 228-1 threads for gas connections (see Annex ZA (informative) Relationship between this European Standard and the Essential Annex
24、C (normative) Performance test methods 30 EN 88-2:2007 (E) 4 Foreword This document (EN 88-2:2007) has been prepared by Technical Committee CEN/TC 58 “Safety and control devices for gas-burners and gas-burning appliances”, the secretariat of which is held by BSI. This European Standard shall be give
25、n the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2008, and conflicting national standards shall be withdrawn at the latest by May 2008. This document has been prepared under a mandate given to CEN by the European Commission and t
26、he European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. EN 88 consists of the following parts under the general title “Pressure regulators and associated s
27、afety devices for gas appliances”: Part 1: Pressure regulators for inlet pressures up to and including 500 mbar; Part 2: Pressure regulators for inlet pressures above 500 mbar up to and including 5 bar. This European Standard should be used in conjunction with EN 13611 Safety and control devices for
28、 gas burners and gas burning appliances General requirements. SIL classification according to EN 61508 cannot automatically be claimed based upon compliance with this standard. Pressure regulators with SIL classification do not meet automatically the requirements of this standard. According to the C
29、EN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
30、 Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. DIN EN 88-2:2008-03 EN 88-2:2007 (E) 5 Introduction This standard is a particular standard for Pressure Regulators for gas-burners and gas-burning appliances which c
31、ites EN 13611 Safety and control devices for gas burners and gas-burning appliances - General requirements wherever possible. This standard supplements or modifies the corresponding clauses of EN 13611. The construction and performance requirements are as far as applicable in total conformity with E
32、N 13611. DIN EN 88-2:2008-03 EN 88-2:2007 (E) 6 1 Scope This European Standard specifies the safety, construction and performance requirements for pressure regulators (hereafter referred to as regulators) intended for use with gas burners and gas-burning appliances using fuel gases of the 1st, 2ndan
33、d 3rdfamilies. This European Standard covers type testing only. It also provides additional information for the purchaser and user. This European Standard is applicable to regulators that may be tested independently of gas burners and gas-burning appliances, which have a declared working pressure fr
34、om above 500 mbar up to and including 5 bar. This European Standard is also applicable to regulators incorporating safety devices. NOTE 1 For safety accessories and pressure accessories, the requirements of EN 13611:2007, Annex F also apply. NOTE 2 Regulators conforming to EN 88-2 fulfil also the re
35、quirements of EN 88-1. Regulators intended to be used on pipe work installations for third family gases are also covered by EN 13785 and EN 13786. This European Standard is not applicable to: a) pressure regulators that are connected directly to mains pipe-work or to a container that maintains a sta
36、ndard distribution pressure; b) pressure regulators which use electrical auxiliary energy. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest editio
37、n of the referenced document (including any amendments) applies. EN 88-1:2007, Pressure regulators and associated safety devices for gas appliances Part 1: Pressure regulators for inlet pressures up to and including 500 mbar EN 549, Rubber materials for seals and diaphragms for gas appliances and ga
38、s equipment EN 682, Elastomeric seals Materials requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids EN 13611:2007, Safety and control devices for gas burners and gas burning appliances General requirements EN 13787, Elastomers for gas pressure regulators and associa
39、ted safety devices for inlet pressures up to 100 bar EN 60534-1:2005, Industrial-process control valves Part 1: Control valve terminology and general considerations (IEC 60534-1:2005) EN 60534-2-3, Industrial-process control valves Part 2-3: Flow capacity Test procedures (IEC 60534-2-3:1997) DIN EN
40、88-2:2008-03 EN 88-2:2007 (E) 7 EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) EN ISO 6708, Pipework components Definition and selection of DN (nominal size) (ISO 6708:1995) ISO 7-1, Pipe threads wher
41、e pressure tight joints are made on the threads Part 1: Designation, dimensions and tolerances ISO 3419, Non-alloy and alloy steel butt-welding fittings 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13611:2007, EN 60534-1:2005 and the following appl
42、y. 3.1 Pressure regulator 3.1.1 pressure regulator device that maintains the outlet pressure constant independent of the variations in inlet pressure and/or flow rate within defined limits 3.1.2 nominal inlet diameter nominal size DN of the inlet connection in accordance with EN ISO 6708 3.1.3 nomin
43、al outlet diameter nominal size DN of the outlet connection in accordance with EN ISO 6708 3.2 Components NOTE The main components of a pressure regulator and a safety shut-off device are shown in Annex A. 3.2.1 control member movable part of the pressure regulator that is positioned in the flow pat
44、h to restrict the flow through the pressure regulator NOTE A control member may be a plug, ball, disk, vane, gate, diaphragm, etc. 3.2.2 body part of the pressure regulator that is the main pressure containing envelope 3.2.3 valve seat corresponding sealing surfaces within a pressure regulator, or S
45、SD that make full contact only when the pressure regulator or SSD is in the closed position 3.2.4 seat ring replaceable component of a regulator valve seat assembly DIN EN 88-2:2008-03 EN 88-2:2007 (E) 8 3.2.5 actuator device or mechanism which changes the signal from the controller into a correspon
46、ding movement controlling the position of the control member 3.2.6 casing of actuator housing of the actuator NOTE There may be two chambers under pressure within it. When the pressure in each chamber is different from atmospheric pressure, the chamber at the higher pressure is termed the “motorizat
47、ion chamber“ 3.2.7 controller device that controls the regulator NOTE It includes: setting element, normally a spring, to obtain the set value of the controlled variable; detector element, normally a diaphragm, for the controlled variable. 3.2.8 pilot controller device that controls the regulator NO
48、TE It includes: setting element to obtain the set value of the controlled variable; detector element for the controlled variable; unit which compares the set value of the controlled variable with its feedback value; system which provides the motorization energy for the actuator. 3.2.9 main diaphragm
49、 device that detects the controlled variable feedback pressure and provides the force to position the valve 3.2.10 pressure containing parts parts where failure would result in release of gas to the atmosphere NOTE Such parts comprise bodies, control member, bonnets, the casing of the actuator, blind flanges and pipes for process and sensing lines. 3.2.11 inner metallic partition wall metallic wall that divides internal chambers which have differing operating pressures 3.2.12 process and sensing line li
