1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 16873:2011Hydraulic fluid power Pressure switches MountingsurfacesBS ISO 16873:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO
2、16873:2011. Itsupersedes BS ISO 16873:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18/-/5, Control components.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport
3、to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 70255 6ICS 23.100.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards P
4、olicy and Strategy Committee on 30 November 2011.Amendments issued since publicationDate Text affectedBS ISO 16873:2011Hydraulic fluid power Pressure switches Mounting surfacesTransmissions hydrauliques Pressostats Plans de pose ISO 2011Reference numberISO 16873:2011(E)Second edition2011-11-01ISO168
5、73INTERNATIONAL STANDARDBS ISO 16873:2011ISO 16873:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, witho
6、ut permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in Switzerlandii ISO 2011 All rights reser
7、vedBS ISO 16873:2011ForewordISO (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 su
8、bject 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 (
9、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 committ
10、ees 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.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 h
11、eld responsible for identifying any or all such patent rights.ISO 16873 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 5, Control products and components.This second edition cancels and replaces the first edition (ISO 16873:2002), which has been technically revi
12、sed. It also incorporates the Amendment ISO 16873:2002/Amd 1:2005.The surface roughness is updated in Clause 5 according to ISO 3601-2. The modification in ISO 16873:2002/Amd.1:2005 concerning the figure footnotes is also incorporated. ISO 16873:2011(E) ISO 2011 All rights reserved iiiBS ISO 16873:2
13、011IntroductionIn hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure circulating within an enclosed circuit. Pressure switches are important components in such systems. They enable actions to be carried out with predetermined pressure values.ISO 16873:
14、2011(E)iv ISO 2011 All rights reservedBS ISO 16873:2011INTERNATIONAL STANDARD ISO 16873:2011(E)Hydraulic fluid power Pressure switches Mounting surfaces1 ScopeThis International Standard specifies the mounting surfaces for pressure switches and gives guidelines for the standardized arrangement of th
15、e connections for pressure switches and for the mounting of plates and hydraulic valves.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of
16、 the referenced document (including any amendments) applies.ISO 3601-2:2008, Fluid power systems O-rings Part 2: Housing dimensions for general applicationsISO 5598, Fluid power systems and components VocabularyISO 5783, Hydraulic fluid power Code for identification of valve mounting surfaces and ca
17、rtridge valve cavities3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 5598 apply.4 Symbols4.1 For the purpose of this International Standard, the following symbols apply:a) P and L identify ports;b) F identifies threaded holes;c) G identifies locating
18、 pin holes.4.2 The code system used in this International Standard is defined in ISO 5783.5 TolerancesThe following requirements shall be applied to the mounting surface, i.e. the area within the chain thick lines in Figures 1 and 2: surface roughness: see ISO 3601-2:2008, 5.1.4 and 5.2.3; surface f
19、latness: see ISO 3601-2:2008, 5.1.4; tolerance for diameters of locating pin holes: H12. ISO 2011 All rights reserved 1BS ISO 16873:20116 DimensionsThe mounting surface dimensions for pressure switches shall be selected from Figures 1 and 2, respectively: Mounting surface for pressure switches with
20、P-port (code: ISO 16873-01-01-0-11). Mounting surface for pressure switches with P- and L-port (code: ISO 16873-01-02-0-11).7 Identification statement (reference to this International Standard)It is strongly recommended to manufacturers who have chosen to conform to this International Standard that
21、the following statement be used in test reports, catalogues, and sales literature:“Mounting surface dimensions of pressure switches conform to ISO 16873:2011, Hydraulic fluid power Pressure switches Mounting surfaces ”.Dimensions in millimetresaThe minimum thread depth is 1,5 bolt diameters, D. The
22、recommended full thread depth shall be 2D + 6 mm to aid interchangeability of pressure switches and to reduce the number of fixing bolt lengths. The recommended engagement of fixing bolt thread for ferrous mountings is 1,25D.bThe dimensions which mark the region within the dashed line are the minimu
23、m dimensions for the mounting surface. Along each axis the fastening bores have the same distance as the edges of the mounting surface.cElectrical connector and adjustment may exceed this dimension.dReference dimensions.eOptional additional holes.fThis dimension gives the minimum space required for
24、a pressure switch with this mounting surface. The dimension is also the minimum distance from centreline to centreline of two identical mounting surfaces placed on a manifold block.Figure 1 Mounting surface for pressure switches with a P-port (Code: ISO 16873-01-01-0-11)ISO 16873:2011(E)2 ISO 2011 A
25、ll rights reservedBS ISO 16873:2011Dimensions in millimetresaThe minimum thread depth is 1,5 bolt diameters, D. The recommended full thread depth shall be 2D + 6 mm to aid interchangeability of pressure switches and to reduce the number of fixing bolt lengths. The recommended engagement of fixing bo
26、lt thread for ferrous mountings is 1,25D.bThe dimensions which mark the region within the dashed lines are the minimum dimensions for the mounting surface. Along each axis the fastening bores have the same distance as the edges of the mounting surface.cElectrical connector and adjustment may exceed
27、this dimension.dThe L-port shall have the same diameter as the P-port. The position of the L-port may be used instead for a locating pin hole; the hole diameter is then 4 mm, and its minimum depth is 4 mm.eReference dimensions.fOptional additional holes.gThis dimension gives the minimum space requir
28、ed for a pressure switch with this mounting surface. The dimension is also the minimum distance from centreline to centreline of two identical mounting surfaces placed on a manifold block.Figure 2 Mounting surface for pressure switches with a P-port and L-port (Code: ISO 16873-01-02-0-11)ISO 16873:2
29、011(E) ISO 2011 All rights reserved 3BS ISO 16873:2011Bibliography1 ISO 129-1, Technical drawings Indication of dimensions and tolerances Part 1: General principles2 ISO 286-1, Geometrical product specifications (GPS) ISO code system for tolerances on linear sizes Part 1: Basis of tolerances, deviat
30、ions and fits3 ISO 965-1, ISO general-purpose metric screw threads Tolerances Part 1: Principles and basic data4 ISO 1101, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and run-out5 ISO 1302, Geometrical Product Specifications (GPS) Indica
31、tion of suface texture in technical product documentation6 ISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parameters7 ISO 4401, Hydraulic fluid power Four-port directional control valves Mounting surfacesISO 16873:2011(E)4 IS
32、O 2011 All rights reservedBS ISO 16873:2011BS ISO 16873:2011ISO 16873:2011(E) ISO 2011 All rights reservedICS 23.100.50Price based on 4 pagesThis page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, info
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