Hydraulic fluid power Gas-loaded accumulators with separator Selection of preferred hydraulic ports

ISO 2017 All rights reserved ISO/TC 131/SC N Date: 2017-08-18 ISO/PDTR 10946 ISO/TC 131/SC /WG 1 Secretariat: AFNOR Hydraulic fluid power Gas-loaded accumulators with separator Selection of preferred hydraulic ports Transmissions hydrauliques Accumulateurs hydropneumatiques avec séparateur Choix des orifices hydrauliques préférentiels Warning This document is not an ISO International Standard. It is distributed for review and comment. It is subject to change without notice and may not be referred to as an International Standard. Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation. Document type: Technical Report Document subtype: Document stage: (20) Preparatory Document language: E C:\Users\drockhill\AppData\Local\Microsoft\Windows\Temporary Files\Content.Outlook\XNHL1XT9\prISO_TR_10946_final.doc STD Version 2.5a Internet

Copyright notice This ISO document is a working draft or committee draft and is copyright-protected by ISO. While the reproduction of working drafts or committee drafts in any form for use by participants in the ISO standards development process is permitted without prior permission from ISO, neither this document nor any extract from it may be reproduced, stored or transmitted in any form for any other purpose without prior written permission from ISO. Requests for permission to reproduce this document for the purpose of selling it should be addressed as shown below or to ISO's member body in the country of the requester: [Indicate the full address, telephone number, fax number, telex number, and electronic mail address, as appropriate, of the Copyright Manager of the ISO member body responsible for the secretariat of the TC or SC within the framework of which the working document has been prepared.] Reproduction for sales purposes may be subject to royalty payments or a licensing agreement. Violators may be prosecuted. ii ISO 2017 All rights reserved

Contents Page Foreword... iv Introduction... v 1 Scope...5 2 Normative references...5 3 Terms and definitions...5 4 Dimensions...6 4.1 General recommendations... 6 4.2 Thread connections... 6 4.3 Recommendations for ports used with diaphragm type accumulators... 6 4.4 Recommendations for ports used with bladder or piston type accumulators... 6 4.5 Recommendations for ports used with piston type accumulators... 6 5 Identification statement (reference to this Technical Report)...6 Bibliography...5 ISO 2017 All rights reserved iii

Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. In exceptional circumstances, when a technical committee has collected data of a different kind from that which is normally published as an International Standard ( state of the art, for example), it may decide by a simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature and does not have to be reviewed until the data it provides are considered to be no longer valid or useful. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO/TR 10946 was prepared by Technical Committee ISO/TC 131, Fluid power systems. This second/third/... edition cancels and replaces the first/second/... edition (ISO 10946:1999), [clause(s) / subclause(s) / table(s) / figure(s) / annex(es)] of which [has / have] been technically revised. iv ISO 2017 All rights reserved

Introduction In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. Gas-loaded accumulators are components that are able to store and to return energy in accordance with the principle of the compressibility of gases. Hydraulic fluid enters and leaves these accumulators through ports. ISO 2017 All rights reserved v

Hydraulic fluid power Gas-loaded accumulators with separator Selection of preferred hydraulic ports 1 Scope This document specifies the types and selection of hydraulic ports of gas-loaded accumulators with separator, which are used in hydraulic fluid power systems. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5598, Fluid power systems and components Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp 3.1 bladder type accumulator gas-loaded accumulator in which the liquid and gas are separated by a flexible bag or bladder that is normally retained at one end of the shell 3.2 diaphragm type accumulator gas-loaded accumulator in which the liquid and gas are separated by a flexible membrane that is normally retained at its largest diameter to the shell 3.3 piston type accumulator gas-loaded accumulator in which the liquid and gas are separated by a rigid sliding piston ISO 2017 All rights reserved 5

4 Dimensions 4.1 General recommendations For threaded ports, those specified in ISO 6149-1 should be preferred. For flange ports, those specified in ISO 6162-1, ISO 6162-2, ISO 6164-1, ISO 6164-2 and ISO 6164-3 should be preferred. The threaded ports specified in ISO 7-1, ISO 1179-1 and ISO 11926-1 are optional and may be used for existing applications. 4.2 Thread connections Thread connection possibilities are illustrated in Figure 1, which shows ports, as indicated by the arrows. 4.3 Recommendations for ports used with diaphragm type accumulators Ports used with diaphragm type accumulators should be selected from those given in Table 1. 4.4 Recommendations for ports used with bladder or piston type accumulators Ports used with bladder type accumulators should be selected from those given in Table 2. 4.5 Recommendations for ports used with piston type accumulators Ports used with piston type accumulators should be selected from those given in Table 3. 5 Identification statement (reference to this document) The following statement should be used in test reports, catalogues, and sales literature when electing to comply with this document: Hydraulic ports for gas-loaded accumulators with separator selected in accordance with ISO/TR 10946:XXXX, Hydraulic fluid power Gas-loaded accumulators with separator Selection of preferred hydraulic ports. 6 ISO 2017 All rights reserved

Figure 1 Thread connection possibilities ISO 2017 All rights reserved 7

Table 1 Dimensions of ports for diaphragm type accumulators Preferred port in accordance with ISO 6149-1 Optional port in accordance with ISO 1179-1 for existing applications Optional port in accordance with ISO 7-1 for existing applications M14 x 1,5 M18 x 1,5 M22 x 1,5 M27 x 2 G 1/4 G 3/8 G 1/2 G 3/4 Rc 1/4 Rc 3/8 Rc 1/2 Rc 3/4 Optional port in accordance with ISO 11926-1 for existing applications Volume l 0,4 > 0,4, 1,6 > 1,6, 6,3 9/16-18 UNF- 2B 3/4-16 UNF-2B 3/4-16 UNF-2B 3/4-16 UNF-2B NOTE Shaded areas indicate preferred port sizes. ISO 2017 All rights reserved 5

Preferred port in accordance with ISO 6149-1 Optional port in accordance with ISO 1179-1 for existing applications Optional port in accordance with ISO 7-1 for existing applications Optional port in accordance with ISO 11926-1 for existing applications Flange port c in accordance with ISO 6162 or ISO 6164, DN Volume l NOTE 0,4 > 0,4, 1 > 1, 10 > 10 Table 2 Dimensions of ports for bladder or piston type accumulators M14 x 1,5 M18 x 1,5 M22 x 1,5 M27 x 2 M33 x 2 M42 x 2 M48 x 2 M60 x 2 M75 x 2 a M90 x 2 a G 1/4 G 3/8 G 1/2 G 3/4 G 1 G 1 ¼ G 1 1/2 G 2 b Rc 1/4 Rc 3/8 Rc 1/2 Rc 3/4 Rc 1 Rc 1 1/4 Rc 1 1/2 Rc 2 ½-20 UNF-2B Shaded areas indicate preferred port sizes. 9/16-18 UNF-2B ¾-16 UNF-2B 7/8-14 UN-2B 1 1/16-12 UN-2B 1 5/16-12 UN-2B 1 5/8-12 UN-2B 1 7/8-12 UN-2B 2 1/2-12 UN-2B 13 19 25 32 38 51 a b ISO 6149-1 does not specify this port for use in hydraulic applications ISO 1179-1 does not specify this port for use in hydraulic applications c Flange port series should be selected according to the allowable pressure of the accumulator (p4), i.e., the maximum permissible pressure for which the accumulator has been designed and/or qualified (see ISO 5596) 6 ISO 2017 All rights reserved

Preferred port in accordance with ISO 6149-1 Optional port in accordance with ISO 1179-1 Table 3 Dimensions of port for piston type accumulators Optional port in accordance with ISO 7-1 Optional port in accordance with ISO 11926-1 Flange port c in accordance with ISO 6162 or ISO 6164, DN Port Size Min bore I.D. Port Size Min bore I.D. Port Size Min bore I.D. Port Size Min bore I.D. Port Size Min bore I.D. M14 x1,5 50 G 1/4 40 Rc 1/4 40 1/2-20 UNF-2B 50 13 75 M18 x 1,5 50 G 3/8 50 Rc 3/8 50 9/16-18 UNF-2B 50 19 75 M22 x 1,5 50 G 1/2 50 Rc 1/2 50 3/4-16 UNF-2B 50 25 75 M27 x 2 50 G 3/4 50 Rc 3/4 50 7/8-14 UN-2B 50 32 75 M33 x 2 75 G1 75 Rc 1 75 M42 x 2 75 G1 1/4 75 Rc 1 11/4 75 1 1/16-12 UN- 2B 1 5/16-12 UN- 2B 50 38 100 75 51 150 M48 x 2 100 G1 1/2 100 Rc 1 1/2 100 1 5/8-12 UN-2B 75 64 150 M60 x 2 175 G2 b 100 Rc 2 100 1 7/8-12 UN-2B 100 M75 x 2 a 175 2 1/2-12 UN-2B 175 a b ISO 6149-1 does not specify this port for use in hydraulic applications ISO 1179-1 does not specify this port for use in hydraulic applications c Flange port series should be selected according to the allowable pressure of the accumulator (p4), i.e., the maximum permissible pressure for which the accumulator has been designed and/or qualified (see ISO 5596) ISO 2017 All rights reserved 7

Bibliography [1] ISO 7-1, Pipe threads where pressure-tight joints are made on the threads Part 1: Designation, dimensions and tolerances [2] ISO 1179-1, Connections for general use and fluid power Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing Part 1: Threaded ports [3] ISO 5596, Hydraulic fluid power Gas-loaded accumulators with separator Range of pressures and volumes and characteristic quantities [4] ISO 6149-1, Connections for fluid power and general use Ports and stud ends with ISO261 threads and O-ring sealing Part 1: Ports with truncated housing for O-ring seal [5] ISO 6162-1, Hydraulic fluid power Flange connectors with split or one-piece flange clamps and metric or inch screws Part 1: Flange connectors, ports and mounting surfaces for use at pressures of 3,5 MPa (35 bar) to 35 MPa (350 bar), DN 13 to DN 127 [6] ISO 6162-2, Hydraulic fluid power Flange connectors with split or one-piece flange clamps and metric or inch screws Part 2: Flange connectors, ports and mounting surfaces for use at a pressure of 42 MPa (420 bar), DN 13 to DN 76 [7] ISO 6164-1, Hydraulic fluid power Part 1: One-piece square-flange connections Part 1: Fourscrew square-flange connectors for use at 25 MPa (250 bar), DN 12 to DN 70 [8] ISO 11926-1, Connections for general use and fluid power - ports and stud ends with ISO 725 threads and O-ring sealing Part1: Ports with O-ring seal in truncated housing ISO 2017 All rights reserved 5