6704 International Standard (ISO Automatic steam traps - Classification Purgeursautomatiquesdevapeurd'eau-Classification First edition --- 1982-01-15 Corrected and reprinted - 1983-01-15 (3) UDC 621.186.6 Ref. No. 1SO 6704-1982 (E) SO6704-1982 Descriptors : industrial valves, traps, steam, classifications. Price based on 4 pages NoreproductionornetworkingpermitedwithoutlicensefromIHS Not for Resale Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing Inter- national Standards is carried out through isoO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. International Standard ISO 6704 was developed by Technical Committee ISO/TC 153, Valves, and was circulated to the member bodies in February 1980. It has been approved by the member bodies of the following countries : Australia Finland Poland Austria France Romania Belgium Germany, F.R. South Africa, Rep. of Brazil India Sweden Canada Italy Switzerland China Korea, Rep. of United Kingdom Czechoslovakia Netherlands USA Denmark Norway USSR No member body expressed disapproval of the document. C InternationalOrganizationforStandardization,1982 Printed in Switzerland No reproduction or networking permited without icense from IHS Not fr Resale ISO 6704-1982 (E) INTERNATIONALSTANDARD Automatic steam traps - Classification 1 Scope and field of application enciosure whilst remaining tight to live steam or, if necessary, alowing steam to flow at a predetermined rate. The purpose of this International Standard is to establish a simple classification of the main types of automatic steam traps according to the mode of actuation of their obturation device and disregarding their details of conception and construction. 4 Classification 2 References The types of traps defined hereunder are classified according to their mode of actuation; other traps, combining these different Iso 6552, Automatic steam traps - Terminology. types (or of a new design) may be developed, but these traps shall not be regarded as a characteristic type of automatic Iso 6553, Automatic steam traps - Marking. steamtraps inthesenseof thisInternational Standard iso 6554,Flanged automatic steam traps- Face-to-face If oneconsidersthe modeof actuation of theobturation dimensions. device, three categories of automatic steam traps can be distinguished : 3Definition mechanical traps, actuated by the level of condensate (4.1); For this International Standard, the following definition applies : thermostatic traps, actuated by the temperature of condensate (4.2); automatic steam trap: Self-contained valve ewhich automatically drains the condensate from a steam-containing thermodynamic traps, actuated by fluid dynamics (4.3). Copyright Intemational Organization for Standardization nse from IHS Not for Resal