Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New IS (2005): Hydraulic fluid power - Pressure relief valves - Mounting surfaces [PGD 16: Fluid Power]! न $ एक न' भ रत क +नम-ण Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen

2

3

4 \n N<$llc ich GwTTm 3TFa-wlwa-G Indian Standard HYDRAULIC FLUID POWER PRESSURE RELIEF VALVES MOUNTING SURFACES ( First Revision) ICS BIS 2005 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI March 2005 Price Group 8

5 Hydraulic Fluid Power Systems Sectional Committee, MGP 15 NATIONAL FOREWORD This Indian Standard (First Revision) which is identical with Hydraulic fluid power Pressure-relief valves Mounting surfaces issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendations of the Hydraulic Fluid Power Systems Sectional Committee and approval of the Medical Instruments, General and Production Engineering Division Council. This standard was first published in 1994 by adopting ISO 6264:1987 Hydraulic fluid power Pressurerelief valves Mounting surfaces under dual numbering system. The ISO Standard has since been revised as. To align the standard with international practices, the sectional committee, dealing with the subject, decided to revise IS 14150:1994 by adopting as Indian Standard under dual numbering system. In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. Hydraulic valves are typical components in such systems. These devices control the flow direction, pressure or flow rate of liquids in the enclosed circuit. The text of the ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. b) Comma (,) has been used as a decimal marker in the International Standard while in Indian Standards, the current practice is to use a point (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their places are listed below along with their degree-of equivalence for the editions indicated: International Standard Corresponding Indian Standard Degree of Equivalence ISO1101 : 1983Technical drawing Geometrical tolerancing Tolerancing of form, orientation, location and runout Generalities, definitions, symbols, indications on drawings ISO : 1991 Fluid power systems and components Graphic symbols and circuit diagrams Part 1 : Graphic symbols ISO 4401 : 1994 Hydraulic fluid power Four-port directional control valves Mounting surfaces ISO 5598 : 1985 Fluid power systems and components Vocabulary IS 8000 (Part 1) : 1985 Geometrical tolerancing on technical drawings: Part 1 Tolerances of form, orientation, location qnd run-out and appropriate geometrical definitions (first revision) IS 7513:1974 Graphical symbols for fluid power systems IS 10187:2002 Hydraulic fluid power Four-port directional control valves Mounting surfaces (first revision) IS 10416:1992 Fluid power systems and components Vocabulary (first revision) Identical Technically equivalent Identical do (Continued on third cover)

6 Indian Standard HYDRAULIC FLUID POWER PRESSURE RELIEF VALVES MOUNTING SURFACES ( First Revision) 1 Scope This international Standard specifies the dimensions and other data relating to surfaces on which hydraulic pressure-relief valves are mounted in order to ensure interchangeabilii. It is applicable to mounting surfaces for hydraulic pressure-relief generally applicable to industrial equipment. valves which represent current practice; they are 2 Normative references The following standards contain provisions which, through reference of this text, constitute provisions of ths International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 468:1982, Surface roughness Parameters, their values and general rules for speci&ing requirements. ISO 1101:1983, Technical drawing Geometrical tolerancing Tolerancing of form, orientation, location and runout Generalities, definitions, symbols, indications on drawings. ISO :1991, Fluid power systems and components Graphic symbols and circuit diagmma Part 1: Graphic symbols. ISO 1302:1992, ISO 4401:1994, ISO 5598:1985, Technical drawing Method of indicating surface texture. Hydraulic fluid power Four-potf directional control valves Mounting sutfaces. Fluid power systems and components Vocabulary. tso 5783:1995, Hydraulic fluid power Code for identification of valve mounting surfaces and cartridge valve cavities. 3 Definitions For the purposes of this International Standard, the definitions given in ISO 5598 apply. 4 Symbols 4.1 For the purposes of this international Standard, the following symbols apply a) A, B, L, P, T and X designate ports;

7 b) c) d) e) F,, F2, F3, F4, F5 and F6 designate threaded holes for fixing bolts; G designates pin holes; D designates the fixing screw diametel rmw designates mounting surface edge radius. 4.2 The graphic symbols used in figures 2, 3, 5, 6, 8, 10, 12, 14, 16 and 18 are in accordance symbols of ISO 12i9-1. with the graphic 4.3 The code system used in this International Standard is defined in ISO Tolerances The following values shall be applied to the mounting surface, i.e. the area within the chain thick lines: surface roughness: Ras 0,8pm (see ISO 468 and ISO 1302); surface flatness: 0,01 mm over a distance of 100 mm (see ISO 1101); tolerance for diameters of locating pin holes: H12. The following tolerances shall be respected along the x and y axes with respect to the origin: pin holes: + 0,1 mm; screw holes: + 0,1 mm; port holes: ~ 0,2 mm. For other dimensions, see the figures, 6 Dimensions 6.1 Mounting surface dimensions for hydraulic pressure-relief valves shall be selected from the figures specified in 6.2 to Mounting surface dimensions for pressure-relief valves with main ports of 4,5 mm maximum porl diameter (code: ) are given in figure Mounting surface dhr,ensions for pressure-relief valves with main ports of 7,5 mm maximum port diameter (code: ) are given in figure Mounting surface dimensions for pressure-relief valves with main ports of 14,7 mm maximum port diameter (code: ) are given in figure Mounting surface dimensions for pressure-relief valves with main ports of 23,4 mm maximum port diameter (code: ) are given in figure Mounting surface dimensions for pressure relief valves with main ports of 32 mm maximum port diameter (code: ) are given in figure 17. 2

8 7 Port marking 7.1 The port symbols for pressure-relief valves shall be selected from the figures specified in 7.2 to Symbols for directly-operated pressure-relief valves with main ports of 4,5 mm maximum pori diameter (code: *-97) are given in figure Symbols for pilot-operated pressure-relief valves with main ports of 4,5 mm maximum port diameter (code: *-97) are given in figure Symbols for directly-operated pressure-relief valves with main ports of 7,5 mm maximum port diameter (code: ) are given in figure Symbols for pilot-operated pressure-relief valves with main ports of 7,5 mm maximum port diameter (code: ) are given in figure Symbols for pilot-operated pressure-relief valves with main ports of 14,7 mm maximum port diameter (code: ) are given in figure Symbols for pilot-operated pressure-relief valves with main ports of 23,4 mm maximum port diameter (code: ) are given in figure Symbols for pilot-operated pressure-relief valves with main ports of 32 mm maximum port diameter (code: *-97) are given in figure Modular stack valves For modular stack valves, the mounting surfaces and ports marking defined in ISO 4401 shall be used. 9 Working pressure For indication of the maximum limit of the working pressure, see note 1 in figures 1,4, 9, 13 and Identification statement (Reference to this International Standard) It is strongly recommended that manufacturers use the following statement in test reports, catalogues and sales literature when electing to comply with this International Standard: Mounting surface dimensions conform to, Hydraulic fluid power Pressure-relief valves Mounting surfaces. 3

9 Code: Dimensions in millimetres _,._.. _.... _......fl..! 1-40 rein,z] -1 1) The minimum thread depth is 1,5 times the ~cre~ djamet~r, D. The recommended full thread depth is 2D + 6 ITlflltO facilitate interchangeability of valves and to reduce the number of fixing screw lengths. The recommended engagement of fixing screw thread forferrousmountingsis 1,25D. t 2) The dimensions speci~ln9 the area withinthe chain thick lines are the minimumdimensionsfor the mounting SiJffaCe. The corners of the rectangle may be radiusedto a maximum radius, rmax, equal to the thread diameter of the fixingscrews. Along each axes the fixing holes are at equal distances to the mounting surface edges. 3) This dimension gives the minimum space required for a valve with this mounting surface. The dimension k dso the minimum distance from centreline to centreline of two identical mounting surfaces placed on a manifold block. The valve manufacturer s attention is drawn to the fact that no part of the width of the complete valve assembly shall exceed this dimension. 4, Blind hole in the mounting surface to accommodate the locating pin on the valves. The minimum depth is 4 mm. NOTES 1 The supplier shall stipulate the maximum working pressure for subplates and manifold blocks. 2 See figures 2 and 3 for graphic symbols. Axis P A T B F, F2 F3 Fd G 04,5 max. 04,5 max. 04,5 max. 04,5 max. M5 M5 M5 M5 03,4 x 12 4, , ,5 & Y 20,25 11,25 2,25 11,25 0-0,75 23,25 22,5 4,75 Figure 1 - Mounting surface for pressure-relief valves with main ports of 4,5 mm maximum port diameter (size 02) 4

10 Option according to ISO Description External drain internal drain ressure-relief valves.--iy~,,i~~ ressure-relief valves with by-pass :heck valve ~qft, ~~f Figure 2 Directly-operated pressure-relief valves with main ports of 4,5 mm maximum port diameter (code ) Option according to ISO Description External drain ressure-relief valves,---,.=i+b.,,. L- -1 P T &A P %essure-relief valves with by-pass,---,.~i + B :heck valve.\,, ; I_- -- >: * T AA I) Port for remote-controlled pilot it maybe blocked if not needed.. Figure 3 Pilot-operated pressure-relief valves with main ports of 4,5 mm maximum port diameter (code: ) 5

11 Code: Dimensions in millimetres o o~x _ F, },, ry FL 4k- 51 rein,z) ) The minimum thread de@h is 1,5 times the screw diameter, D, The recommended full thread depth k 2D + 6 mm to facilitate interchanaeabilitv of valves and to reduce the number of fixing screw lengths. The recommended engagement of fixing screw thread-for fer;ous mountings is 1,25D. 2) The dimensions specifyin9 the area within the chain thick lines are the minimum dimensions for the ttiounting SUrfilCe. The corners of the rectangle may be radiused to a maximum radius, r~~,, equal to the thread diameter of the fixing screws. Along each axes the fixing holes are at equal distances to the mnunting surface edges. 3) This dimension gives the Minimum space required for a valve with this mounting surface. The dimension k dso the minimum distance from centreline to centreline of two identical mounting surfaces placed on a manifold block. The valve manufacturer s attention is drawn to the fact that no part of the width of the complete valve assembly shall exceed this dimension. 4, Blind hole in the mounting surface to accommodate the locating pin on the valves. The minimum depth is 4 mm. NOTES 1 The supplier shall stipulate the maximum working pressure for subplates and manifold blocks. 2 See figures 5 and 6 for graphic symbols. Axis P A T B G F, F2 F3 Fd 07,5 max. 07,5 max. 07,5 max. 07,5 max. 04 M5 M5 M5 M5 x 21,5 12,7 21,5 30, ,5 40,5 0 Y 25,9 15,5 5,1 15)5-0,75 0-0,75 31,75 31 Figure 4 Mounting surface for preaaure-relief valves with main ports of 7,5 mm maximum port diameter (size 03) 6

12 Option according to ISO Description External drain Internal drain %essure-relief valves RA 1!? ressure-relief valves with }y-pass check valve ~~~t ~~p Figure 5 Directly-operated pressure-relief valves with main porte of 7,5 mm maximum port diameter (code: ),_-T Option according to ISO 5783 \\,~ 2 Description External drain %essure-relief valves P =! -1 L--1 T LA 3ressure-relief valves with by-pass :heck valve P,--- 1.,,-~1,, ~ B ] - L- -- * T LA I) Port for remote-controlled pilot; it maybe blocked if not needed. Figure 6 Pilot-operated pressure-relief valves with main porta of 7,5 mm maximum port diameter (code: ) 7

13 Code: WARNING This mounting surface has become obsolete. It is planned to remove it from this International Standard at the next revision, in approximately five years. Do not use for new designs x Dimensions in millimetres o r Y.. ~ i , F, ) F2 ) -Q e 1.) 9.,- z r c. : -, lx -Q- -efit] I 1) The minimum thread de~th is 1,5 times the screw diameter. D. The recommended full thread dedth is 2D + 6 mm to facilitate interchangeability of valves and to reduce the number of fixing screw lengths. The recommended engagement of fixing screw thread for ferrous mountings is 1,25D. 2, The dimensions specifying the area within the chain thick lines are the minimum dimensions for the mounting surface. The corners of the rectangle maybe radiused to a maximum radius, r~,x, equal to the thread diameter of the fixing screws. Along each axes the fixing holes are at equal distances to the mounting surface edges. 3, This dimension gives the minimum space required for a valve with this mounting sudace. The dimension ia also the minimum distance from centreline to centreline of two identical mounting surfaces placed on a manifold block. The valve manufacturer s attention is drawn to the fact that no part of the width of the complete valve assembly shall exceed this dimension. 4, Blind hole in the mounting suriace to accommodate the locating pin on the valves. The minimum depth is 4 mm. NOTES 1 The supplier shall stipulate the maximum working pressure for subplates and manifold blocks. 2 See figure 8 for graphic symbols. Axis A B x L G F, F2 F3 F4 014,7 max. 014,7 max. 04,8 04,8 07,5 M1O M1O M1O M1O x 7,1 35,7 21,4 21, ,9 42,9 0 Y 33,3 33,3 58,7 7,9 14, ,7 88,7 Figure 7 Mounting surfscs for pressure-relief valves with main porta of 14,7 mm maximum port dismeter (size 05) a

14 IS 14150: mo5 Option according to ISO Description External drain Internal drain %essure-relief valves,i:f,-w ressure-relief valves with ~A ]y-pass check valve,--., # ;---.,.-=! + 0 *, / \ / t I! I t L..! B l_.l_h Bu 1: M, 1) Port for remote-controlled pilot; it maybe blocked if not needed. Figure 8 Pilot-operated pressure-relief,valves with main ports of 14,7 mm maximum port diameter (code: *-97). 9

15 ISO 6264: 1998 Code: o?-----~ _ _ Dimensions in millimetres L L 80 min.z) ) The minimum thread depth is 1,5 times the screw diameter, D. The recommended full thread depth is 2D + 6 mm to facilitate interchangeability of valves and to reduce the number of fixing screw lengths. The recommended engagement of fixing screw thread for ferrous mountings is 1,25D. 2) The dimensions specifyin9 the area within the chain thick lines are the minimum dimensions for the mounting SUlfaCe. The corners of the rectangle may be radkised to a maximum radius, r~~x,equal to the thread diameter of the fixing screws. Along each axes the fixing holes are at equal distances to the mounting surface edges. 3) This dimension gives the minimum space required for a valve with this mounting surface. The dimension k dso the minimum distance from centrelineto centreline of two identicalmountingswfaces placed on a manifoldblock. The valve manufacturers attention is drawn to the fact that no part of the width of the complete valve assembly shall exceed this dimension. 4) Blind hole in the mountin9 ~u~ace to accommodateodate the locating pin on the valves. The lllitlkllurll depth k3 4 MI1 1. 5) This optional po~ should be provided on the mounting su&ce only when required by the fullction Of the VdVe. NOTES 1 The supplier shall stipulate the maximum worldng pressure for subplates and manifold blocks. 2 See figure 10 for graphic symbols. Axis P T x Ll) G F1 F2 F3 F4 014,7 max. 014,7 max. 04,8 04,8 07,5 M12 M12 M12 M12 x 22,1 47,5 0 31,8 22,1 0 53,8 53,8 0 Y 26,9 26,9 26,9 0 53, ,8 53,8 1) For coda Figure 9 Mounting surface for pressure-relief valves with main pmte of 14,7 mm maximum port diameter (size 06) 10

16 Option according to ISO Description External drain Internal drain %essure-reiief valves w!$% %essure-relief valves with P ]y-pass check valve,---,-~1 + x ~--s,,:.,,. :,/-E, + x :!-- L- T &l y - ~M Tu I) Port for remote-controlled pilot; it maybe blocked if not needed. Pigure 10 Pilot-operated pressure-relief valve with main porte of 14,7 mm maximum port diameter (code: 62S ) 11

17 Code: l-*-97 WARNING This mounting sutface has become obsolete. It is Dlanned to remove Standard at the next revisio~ in approximately five years. Do not use \or new designs. it from this International o X _.. r- _.. _.. _......_.. _... r l-@- o! F, ) İ i yjy ma B I Dimensions in millimetres!.,. lx F31] 9.,......_.._.._.._.._.._.._ -?9mirl 1) The minimum thread depth is 1,5 times the screw diameter, D. The recommended full thread demh k 2D + 6 mm to faci~tete interchangeability of valves and to reduce the number of fixing screw lengths. The recommended engagement of fixing screw thread for ferrous mountings is 1,25D. 2, The dimensions specifyingthe area withinthe chainthick lines are the minimumdimensionsfor the mountingsurface. The comers of the rectangle may be radiusedto a maximum radius,rmm, equal to the thread diameter of the fixingscrews. Along each axes the fixingholes are at equal distancesto the mountingsurface edges. 3, This dimensiongivesthe minimumspace requiredfora valve withthismountingsurface. The dimensionis also the minimumdistancefrom centreline to centrelineof two identicalmountingsurfacesplacad on a manifoldblock. The valve manufacturers attentionis drawn to the fact hat no pan of the widthof the completevalve assemblyshall exceed this dimension. 4, Blind hole in the mountingsurface to accommodate the locatingpin on the valves. The minimumdepthis 4 mm. NOTES 1 The suppliershall stipulatethe maximumworkingpressurefor subplatesand manifoldblocks. 2 See figure 12 for graphicsymbcls. Axis A B x L G F1 F2 F3 Fd 023,4 max. 023,4 max. 04,8 04,8 07,5 MIO M1O M1O M1O x 11,1 49,2 20,6 39, ,3 60,3 0 Y 39,7 39,7 73 6,4 15, ,4 79,4 Figure 11 Mouting surface for pressure-relief valvee with main ports of 23,4 mm maximum port dismeter (size 08) 12

18 Option according to ISO Description External drain Internal drain %essure-relief valves ~-~,-pj?ressure.relief valves with A >y-pass check valve,---,-~~ + x ] ;-,,, :,,.=l + x \\,/ I : L- L. -- : * B til?:- ~ M B L_J I) Pori for remote-controlled pilot; it maybe blocked if not needed. Figure 12 Pilot-operated pressure-relief valves with main ports of-23,4 mm maximum port diameter (code: ) 13

19 Code: *-97 Dimensions in millimetres o.x t-.._.. l..._.._.._.. _.._.. 1 o t Y ~ 115min.z 1, The minimum thread depth is 1,5 times the screw diameter, D. The recommended full thread depth is 2D+6mm to facilitate interchangeability of valves and to reduce the number of fixing screw lengths. The recommended engagement of fixing screw thread for ferrous mountings is 1,25D. 2, Thedimensions sped~ng thearea within thechain thick lines aretheminimum dimensions forthemounting sutiace. The corners of therectangle may beradiused toa maximum radius, rmax,equal tothethread diameter of the fixing screws. Along each axes the fixing holes are at equal distances to the mounting suriace edges. 3, This 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. The valve manufacturer s attention is drawn to the fact that no part of the width of the complete valve assembiyshall exceed this dimension. 4, Blind hole in the mounting suriace to accommodate the locating pin on the valves. The minimum depth is 4 mm. 5, This optional port should be provided on the mounting surface only when required by the function of the valve. NOTES 1 The supplier shall stipulate the maximum working pressure for subplates and manifold blocks. 2 See figure 14 for graphic symbols. x sk+=. T x Ll) G F, F2 F3 F4 023,4 max. 06,3 06,3 07,5 M16 M16 M16 M16 55,6-23,8 43,7 33,4 0 66,7 66, t ) For code: ( -97. Figure 13 Mounting surface for pressur~relief valves with main ports of 23,4 mm maximum port diameter (size 08) 14

20 Option according to ISO Description External drain Internal drain %essure-reiief valves w ) w ) ressure-relief valves with ]y-pass check valve,--- l-- P =; -1 ;---., p.-=j -1 \\,/ \ / --, ll- m T til? - M T u ) Port for remote-controlled pilot; it maybe blocked if not needed. Figure 14 Pilot-operated pressure-relief with main ports of 23,4 mm maximum port diameter (code: ) 15

21 Code: *-97 WARNING This mounting surface has become obsolete. It is planned to remove it from this International Standard at the next revision, in approximately five years. Do not use for new designs. o or...._.._.._.._.._.._ * 2 + r _._.-,.. 41 Dimensions in millimetres -e A 0 ob..., ) The minimum thread dermh is 1,5 times the screw diameter, D. The recommended full thread depth is 2D + 6 mm to facilitate interchangeability of valves and to reduce the number of fixing screw lengths. The recommended engagement of fixing screw thread for ferrous mountings is 1,25D. 2, The dimensions specifying the area within the chain thick lines are the minimum dimensions for the mounting surface. The corners of the rectangle maybe radiused to a maximum radius, rm~x,equal to the thread diameter of the fixing screws. Along each axes the fixing holes are at equal distances to the mounting surface edges. 3) This dimension gives the minimum space required for a valve with this mounting surface. The CfimenSiOn k3 ak?o the minimum distance from centreiine to centreiine of two identical mounting surfaces placed on a manifold block. The valve manufacturer s attention is drawn to the fact that no part of the width of the complete valve assembly shall exceed this dimension. 4, Blind hole in the mounting surface to accommodate the locating pin on the valves. The minimum depth is 4 mm. NOTES 1 The supplier shall stipulate the maximum working preasure for subplates and manifold blocks. 2 See figure 16 for graphic symbols. Axis A B x L G F1 F2 F3 Fh F5 Flj 032 max. 032 max. 04,8 04,6 07,5 M1O M1O M1O M1O M1O M1O x 16,7 67,5 24,6 59, ,1 84,1 0 42,1 42,1 Y 48,4 46,4 92,9 4 21, ,8 96,8 0 96,8 i Figure 15 Mounting surface for pressure-relief valves with main ports of 32 mm maximum port diameter (size 10) 16

22 Option according to ISO Description External drain Internal drain ressure-relief valves P!?!EG +essure-relief valves with ~y-pass check valve,--< 1] ;---.,, ;,,! 1 I l 1 L-- 1 B I) Port for remote-controlled pilot; it maybe blocked if not needed. Figure 16 Pilot-operated pressure-relief valves with main ports of 32 mm maximum port diameter (code: *-97) 17

23 Code: * Dimensions in millimetres 0.. r Y 150 min.z) ~ The minimum thread depth is 1,5 times the screw diameter, D. The recommended full thread depth is 2D + 6 mm to facilitate interchangeability of valves and to reduce the number of fixing screw lengths. The recommended engagement of fixing screw thread for ferrous mountings is 1,25D. 2, The dimensions specifying the area within the chain thick 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. Along each axes the fixing holes are at equal distances to the mounting surface edges. 3, This 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. The valve manufacturer s attention is drawn to the fact that no part of the width of the complete valve assembly shall exceed this dimension. 4, Blind hole in the mounting sutiace to accommodate the locating pin on the valves. The minimum depth is 4 mm. 5, This optional port should be provided on the mounting surtace only when required by the function of the valve. NOTES 1 The supplier shall stipulate the maximum working pressure for subplates and manifold blocks., 2 See figure 18 for graphic symbols. Axis P T x Ll) G F1 F2 F3 Fq 032 max. 06,3 06,3 07,5 M18 M18 M18 M18 x 12,7 76,2-31,8 54,9 44,5 0 88,9 88,9 0 Y 41,3 41,3 41,3 0 82, ,6 82,6 1) For code: Figure 17 Mounting surface for pressure relief valves with main ports of 32 mm maximum port diameter (size 10) I 18

24 1S0 6264:1998 Option according to ISO Description External drain Internal drain ( A ressure-relief valves P -!! ) ressure-relief valves with ]y-pass check valve P,---,-~1 + X1) \\,, ;---,,, :,/.=l + I --1 T l h L ~- A T u I ) Port for remote-controlled pilot; it maybe blocked if not needed. Figure 18 Pilot-operated pressure-relief valves with main ports of 32 mm maximum port diameter (code: O-17-*-97) 19

25 (Continued from second cover) The Technical Committee responsible for the preparation of this standard has reviewed the provisions of the following ISO Standards and has decided that the same are acceptable for use in conjunction with this standard: /S0 Standard Title ISO 468:1982 Surface roughness Parameters, their values and general rules for specifying requirements ISO 5783:1995 Hydraulic fluid power Code for identification of valve mounting surfaces and cartridge valve cavities

26 Bureau of Indian Standards BIS is a statutory institution established under the Bureau of /ndian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publication), BIS. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of BIS Catalogue and Standards: Monthly Additions. This Indian Standard has been developed from Dot: No. MGP/BP 15 (0459). Amendments Issued Since Publication Amend No. Date of Issue Text Affected Headquarters: BUREAU OF INDIAN STANDARDS Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi Telephones , , website: Regional Offices: Telephones Central : Eastern : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI { /1 4 C.I.T. Scheme Vll M, V.I.P, Road, Kankurgachi , KOLKATA { , Northern : Southern : SCO , Sector 34-A, CHANDIGARH C.I.T. Campus, IV Cross Road, CHENNAI { { , , Western : Branches: Manakalaya, E9 MlDC, Marol, Andheri (East) , MUMBAI { , AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR. NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM. VISAKHAPATNAM. Printed at Simco Printing Press, Delhi