1、BS ISO 5781:2016Hydraulic fluid power Pressure-reducing valves,sequence valves, unloadingvalves, throttle valves andcheck valves MountingsurfacesBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 5781:2016 BRITISH STANDARDNational forewordThis British Standard is
2、 the UK implementation of ISO 5781:2016. Itsupersedes BS ISO 5781:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18/-/5, Control components.A list of organizations represented on this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 p
3、ublication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 87176 4ICS 23.100.50Compliance with a British Standard cannot confer immuni
4、ty fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2016.Amendments issued since publicationDate Text affectedBS ISO 5781:2016 ISO 2016Hydraulic fluid power Pressure-reducing valves, sequence valves, unloading va
5、lves, throttle valves and check valves Mounting surfacesTransmissions hydrauliques Rducteurs de pression, soupapes de squence, soupapes de dcharge, soupapes dtranglement et clapets de non-retour Plan de poseINTERNATIONAL STANDARDISO5781Third edition2016-08-01Reference numberISO 5781:2016(E)BS ISO 57
6、81:2016ISO 5781:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including p
7、hotocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22
8、 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 5781:2016ISO 5781:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 15 Tolerances . 26 Dimensions . 27 Port marking . 28 Modular stack valves 39 Rated pressure 310 Identification sta
9、tement (reference to this International Standard) 3Bibliography .24 ISO 2016 All rights reserved iiiContents PageBS ISO 5781:2016ISO 5781:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of pr
10、eparing 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, i
11、n liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IE
12、C Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility t
13、hat 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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent
14、declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as informati
15、on about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 5, Control products and components.This third edition can
16、cels and replaces the second edition (ISO 5781:2000), which has been technically revised.iv ISO 2016 All rights reservedBS ISO 5781:2016ISO 5781:2016(E)IntroductionIn hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure circulating within an enclosed cir
17、cuit. The most typical components found in such systems are hydraulic valves. They control flow direction, pressure or the flow rate of liquids in the enclosed circuit. ISO 2016 All rights reserved vBS ISO 5781:2016BS ISO 5781:2016Hydraulic fluid power Pressure-reducing valves, sequence valves, unlo
18、ading valves, throttle valves and check valves Mounting surfaces1 ScopeThis International Standard specifies the dimensions and other data relating to surfaces on which hydraulic pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves are mounted in order to ens
19、ure interchangeability.It applies to mounting surfaces for hydraulic pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves, which represent current practice; they are generally applicable to industrial equipment.2 Normative referencesThe following documents, i
20、n whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1219-1, Fluid power systems an
21、d components Graphical symbols and circuit diagrams Part 1: Graphical symbols for conventional use and data-processing applicationsISO 3601-2:2008, Fluid power systems O-rings Part 2: Housing dimensions for general applicationsISO 4401, Hydraulic fluid power Four-port directional control valves Moun
22、ting surfacesISO 5598, Fluid power systems and components VocabularyISO 5783, Hydraulic fluid power Code for identification of valve mounting surfaces and cartridge valve cavities3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 5598 and the graphical s
23、ymbols given in ISO 1219-1 apply.4 Symbols4.1 For the purposes of this International Standard, the following symbols apply:a) A, B, P, T, X and Y identify ports;b) F1, F2, F3, F4, F5and F6identify threaded holes for fixing screws;c) G identifies the location of pin holes;d) D identifies the fixing s
24、crew diameter;e) rmaxidentifies the mounting surface edge radius.4.2 The graphic symbols used in Tables 2, 3, 5, 6, 8, 9, 11, 12, 14 and 15 are in conformance with the graphical symbols in ISO 1219-1.INTERNATIONAL STANDARD ISO 5781:2016(E) ISO 2016 All rights reserved 1BS ISO 5781:2016ISO 5781:2016(
25、E)4.3 The code system used in this International Standard is defined in ISO 5783.5 Tolerances5.1 The following values shall be applied to the mounting surface, i.e. the area within the dashed double-dotted lines: surface roughness: ISO 3601-2:2008, 5.1.4 and 5.2.3; surface flatness: 0,01 mm over a d
26、istance of 100 mm (see ISO 3601-2:2008, 5.1.4); tolerance on diameters of locating pin holes: H12.5.2 With respect to the point of origin, the following tolerances shall be complied with along the x and y axes: pin holes: 0,1 mm; screw holes: 0,1 mm; main ports: 0,2 mm.For the other dimensions, see
27、the figures.6 Dimensions6.1 Mounting surface dimensions for hydraulic pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves shall be selected from the figures and tables specified in 6.2 to 6.6.6.2 Mounting surface dimensions for pressure-reducing valves, sequ
28、ence valves, unloading valves, throttle valves and check valves with main ports of 4,5 mm maximum diameter (code: 5781-02-01-0-16) are given in Figure 1 and Table 1.6.3 Mounting surface dimensions for pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with
29、main ports of 7,5 mm maximum diameter (code: 5781-03-04-0-16) are given in Figure 2 and Table 4.6.4 Mounting surface dimensions for pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with main ports of 14,7 mm maximum diameter (code: 5781-06-07-0-16) are gi
30、ven in Figure 3 and Table 7.6.5 Mounting surface dimensions for pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with main ports of 23,4 mm maximum diameter (code: 5781-08-10-0-16) are given in Figure 4 and Table 10.6.6 Mounting surface dimensions for pre
31、ssure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with main ports of 32 mm maximum diameter (code: 5781-10-13-0-16) are given in Figure 5 and Table 13.7 Port marking7.1 The port symbols to be used for pressure-reducing valves, sequence valves, unloading valve
32、s, throttle valves and check valves shall be selected from the figures specified in 7.2 to 7.11.2 ISO 2016 All rights reservedBS ISO 5781:2016ISO 5781:2016(E)7.2 The symbols for directly-operated pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with main
33、ports of 4,5 mm maximum diameter (code: 5781-02-01-0-16) are given in Table 2.7.3 The symbols for pilot-operated pressure-reducing valves, sequence valves and unloading valves with main ports of 4,5 mm maximum diameter (code: 5781-02-01-0-16) are given in Table 3.7.4 The symbols for directly-operate
34、d pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with main ports of 7,5 mm maximum diameter (code: 5781-03-04-0-16) are given in Table 5.7.5 The symbols for pilot-operated pressure-reducing valves, sequence valves and unloading valves with main ports of
35、 7,5 mm maximum diameter (code: 5781-03-04-0-16) are given in Table 6.7.6 The symbols for directly-operated pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with main ports of 14,7 mm maximum diameter (code: 5781-06-07-0-16) are given in Table 8.7.7 The s
36、ymbols for pilot-operated pressure-reducing valves, sequence valves and unloading valves with main ports of 14,7 mm maximum diameter (code: 5781-06-07-0-16) are given in Table 9.7.8 The symbols for directly-operated pressure-reducing valves, sequence valves, unloading valves, throttle valves and che
37、ck valves with main ports of 23,4 mm maximum diameter (code: 5781-08-10-0-16) are given in Table 11.7.9 The symbols for pilot-operated pressure-reducing valves, sequence valves and unloading valves with main ports of 23,4 mm maximum diameter (code: 5781-08-10-0-16) are given in Table 12.7.10 The sym
38、bols for directly-operated pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with main ports of 32 mm maximum diameter (code: 5781-10-13-0-16) are given in Table 14.7.11 The symbols for pilot-operated pressure-reducing valves, sequence valves and unloading
39、 valves with main ports of 32 mm maximum diameter (code: 5781-10-13-0-16) are given in Table 15.7.12 The direction A to B should not be used in new designs. This variant will be removed when this International Standard is next revised.8 Modular stack valvesFor modular stack valves, the mounting surf
40、aces and port markings defined in ISO 4401 shall be used.9 Rated pressureFor indication of the maximum limit of the working pressure, see Note 1 in the Figures 1, 2, 3, 4 and 5.10 Identification statement (reference to this International Standard)Use the following statement in test reports, catalogu
41、es and sales literature when electing to comply with this International Standard:“Mounting surface dimensions conform to ISO 5781:2016, Hydraulic fluid power Pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves Mounting surfaces .” ISO 2016 All rights reserve
42、d 3BS ISO 5781:2016ISO 5781:2016(E)Dimensions in millimetresKeyaThe minimum thread depth is 1,5 times the screw diameter, D. The full thread depth recommended is 2 D + 6 mm, to facilitate interchangeability of valves and reduce the number of fixing screw lengths. The recommended engagement of fixing
43、 screw thread for ferrous mountings is 1,25 D.bThe dimensions specifying the area within the dashed double-dotted lines are the minimum dimensions for the mounting surface. The corners of the rectangle may be radiused to a maximum radius, rmax, equal to the thread diameter of the fixing screws.cThis
44、 dimension gives the minimum space required for a valve 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.dBlind hole in the mounting surface to accommodate the locating pin on the valves
45、; the minimum depth is 4 mm.NOTE 1 The supplier shall stipulate the maximum working pressure for subplates and manifold blocks.NOTE 2 See Tables 2 and 3 for graphical symbols.Figure 1 Mounting surface for pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves w
46、ith main ports of 4,5 mm maximum diameter (code: 5781-02-01-0-16)Table 1 Mounting surface for pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with main ports of 4,5 mm maximum diameter (code: 5781-02-01-0-16)AxisP A T B F1 F2 F3 F4 G 4,5 max. 4,5 max. 4,
47、5 max. 4,5 max. M5 M5 M5 M5 3,4x 12 4,3 12 19,7 0 24 24 0 26,5y 20,25 11,25 2,25 11,25 0 0,75 23,25 22,5 17,754 ISO 2016 All rights reservedBS ISO 5781:2016ISO 5781:2016(E)Table 2 Directly-operated pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves with mai
48、n ports of 4,5 mm maximum diameter (code: 5781-02-01-0-16)Option conforming to ISO 57830 1 2 3DescriptionExternal drain Internal drainInternal pilot External pilot Internal pilot External pilotPressure-reducing valvesPressure-reducing valves with by-pass check valveSequence valvesSequence valves wit
49、h by-pass check valveUnloading valvesUnloading valves with by-pass check valveThrottle valves ISO 2016 All rights reserved 5BS ISO 5781:2016ISO 5781:2016(E)Option conforming to ISO 57830 1 2 3DescriptionExternal drain Internal drainInternal pilot External pilot Internal pilot External pilotThrottle valves with by-pass check valveCheck valvesPilot-operated check valvesTable 2 (continued)6 ISO 2016 All rights reservedBS ISO 5781:2016ISO 5781:2016(E)Table 3 Pilot-operated pressure-reduc
