ISO 6182-17:2020
(Main)Fire protection — Automatic sprinkler systems — Part 17: Requirements and test methods for pressure reducing valves
Fire protection — Automatic sprinkler systems — Part 17: Requirements and test methods for pressure reducing valves
This document specifies performance requirements, methods of test and marking requirements for pressure reducing valves intended to reduce the downstream water pressure in the piping for water-based fire protection systems. Within the context of this document, pressure reducing valves include both pilot operated pressure reducing valves and direct acting pressure reducing valves. Performance and test requirements for other auxiliary components or attachments to pressure reducing valves are not within the scope of this document.
Protection contre l'incendie — Systèmes d'extinction automatiques du type sprinkler — Partie 17: Exigences et méthodes d'essai pour les détendeurs
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INTERNATIONAL ISO
STANDARD 6182-17
First edition
2020-07
Fire protection — Automatic sprinkler
systems —
Part 17:
Requirements and test methods for
pressure reducing valves
Protection contre l'incendie — Systèmes d'extinction automatiques du
type sprinkler —
Partie 17: Exigences et méthodes d'essai pour les détendeurs
Reference number
ISO 6182-17:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 6182-17:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6182-17:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Nominal sizes and tolerances . 2
4.2 Connections . 2
4.3 Rated working pressure . 3
4.4 Body and cover . 3
4.5 Strength (see 6.4) . 3
4.6 Access for maintenance . 4
4.7 Components . 4
4.8 Leakage and deformation (6.3) . 5
4.9 Non-metallic components (excluding gaskets, diaphragms, seals and other
elastomeric parts) (see 6.5 and 6.6) . 5
4.10 Sealing assembly elements (see 6.7). 5
4.11 Clearances . 5
4.12 Operation (see 6.8) . 5
4.13 Static leakage (see 6.9). 6
4.14 Durability (see 6.10) . 6
5 Production testing and quality control . 6
6 Tests . 6
6.1 Samples . 6
6.2 Spring and diaphragm . 6
6.2.1 Spring. 6
6.2.2 Diaphragm . 7
6.3 Leakage and deformation (see 4.8) . 7
6.3.1 Body leakage (see 4.8.1) . 7
6.3.2 Sealing assembly (see 4.8.2) . 7
6.3.3 Stem seal and repacking leakage (see 4.8.3) . 7
6.4 Strength (see 4.5) . 7
6.4.1 Body (see 4.5.1) . 7
6.4.2 Diaphragms (see 4.5.2) . 7
6.5 Warm-water ageing test for non-metallic components (excluding gaskets, seals
and other elastomeric components) (see 4.9) . 7
6.6 Air ageing test for non-metallic components (excluding gaskets, seals and other
elastomeric components) (see 4.9) . 8
6.7 Sealing element tests (see 4.10) . 8
6.8 Operation (see 4.12) . 9
6.9 Static leakage (90 days) (see 4.13) . 9
6.10 Durability (see 4.14) .10
7 Marking .10
8 Manufacturer’s installation instructions .10
Annex A (normative) Tolerances .12
Bibliography .13
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 6182-17:2020(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC 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 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. 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 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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 5, Fixed firefighting systems using water.
A list of all parts in the ISO 6182 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 6182-17:2020(E)
Fire protection — Automatic sprinkler systems —
Part 17:
Requirements and test methods for pressure reducing
valves
1 Scope
This document specifies performance requirements, methods of test and marking requirements for
pressure reducing valves intended to reduce the downstream water pressure in the piping for water-
based fire protection systems. Within the context of this document, pressure reducing valves include
both pilot operated pressure reducing valves and direct acting pressure reducing valves. Performance
and test requirements for other auxiliary components or attachments to pressure reducing valves are
not within the scope of this document.
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 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws
and studs with specified property classes — Coarse thread and fine pitch thread
ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts with
specified property classes — Coarse thread and fine pitch thread
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
corrosion-resistant material
®1)
bronze, brass, Monel metal, austenitic stainless steel, or equivalent, or plastic material conforming
with the requirements of this document
®
1) Monel is a trademark of Special Metals Corporation and is an example of a suitable product available
commercially. This information is given for the convenience of users of this document and does not constitute an
endorsement by ISO of this product. Equivalent products may be used if they can be shown to lead to the same
results.
© ISO 2020 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 6182-17:2020(E)
3.2
direct acting pressure reducing valve
pressure reducing valve utilizing a diaphragm or spring that responds directly to variations in
downstream pressure to provide the necessary flow and pressure to a system
Note 1 to entry: Direct acting valves are subject to reduced pressure falloff where a decrease in downstream
regulated pressure can occur when the flow increases.
3.3
main valve
part of the valve assembly that controls the flow of water
3.4
minimum opening pressure
pressure at which the valve is intended to start the flow of water
3.5
pilot valve
part of the valve assembly that controls the operating of the main valve (3.3)
3.6
pilot operated pressure reducing valve
hydraulically operated pressure reducing valve which reduces the water pressure in a fire protection
system to a constant, specific value
Note 1 to entry: A pilot operated pressure reducing valve consists of a main valve (3.3) connected to a pilot valve
(3.5) that is capable of changing the position of the closing mechanism in the valve in response to a change in the
pre-set pressure.
3.7
pressure reducing valve
valve designed for the purpose of reducing the downstream water pressure under both flowing and
nonflowing conditions
3.8
rated working pressure
maximum service pressure at which a valve is intended to operate
3.9
stuffing box
open area around the valve stem that is filled with the packing seal
4 Requirements
4.1 Nominal sizes and tolerances
4.1.1 The nominal size of a pressure reducing valve shall be the nominal diameter of the inlet and
outlet connections, i.e. the pipe size for which the connections are intended. The sizes shall be 40 mm,
50 mm, 65 mm, 80 mm, 100 mm, 125 mm, 150 mm, 200 mm, 250 mm or 300 mm.
4.1.2 Unless otherwise noted in a specific clause or subclause of this document, tolerances shall be in
accordance with Annex A.
4.2 Connections
4.2.1 All connections shall be designed for use at the rated working pressure of the valve.
2 © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 6182-17:2020(E)
4.2.2 The dimensions of all connections shall conform with the applicable requirements of relevant
international standards. If international standards are not applicable, national standards may to be used.
For example, ISO 6182-12 contains requirements for grooved-end components. Where there is not an
ISO standard developed, a national standard may be used for other connection types (i.e. threaded,
flanged, or other suitable connections).
4.3 Rated working pressure
4.3.1 The rated working pressure shall be not less than 1,2 MPa (12 bar).
4.3.2 Connections may be machined for lower working pressures to match installation equipment
provided the valve is marked with the lower working pressure, as per 7.3 f).
4.4 Body and cover
4.4.1 The body and cover shall be made of a material with corrosion resistance at least equivalent to
cast iron.
4.4.2 Cover fasteners shall be made of steel, stainless steel, titanium, or other materials with equivalent
physical and mechanical properties.
4.4.3 Non-metallic materials other than gaskets, diaphragms and seals or metals with a melting point
less than 800 °C shall not form part of the valve body or cover.
4.4.4 It shall not be possible to assemble the valve with the cover plate in a position which either
improperly indicates flow direction or prevents proper operation of the valve.
4.5 Strength (see 6.4)
4.5.1 Body (see 6.4.1)
An assembled pressure reducing valve with the sealing assembly blocked open shall withstand, without
rupture, an internal hydrostatic pressure of four times the rated working pressure for a period of 5 min
when tested as specified in 6.4.1.
If the test is not performed with standard production fasteners, the supplier shall provide documentation
showing that the calculated design load of any fastener, neglecting the force required to compress the
gasket, shall not exceed the minimum tensile strength specified in ISO 898-1 and ISO 898-2, when the
valve is pressurized to four times the rated working pressure. The area of the application of pressure
shall be calculated as follows.
a) If a full-face gasket is used, the area of application of pressure is that extending out to a line defined
by the inner edge of the bolts.
b) If an “O”-ring seal or ring gasket is used, the area of application of force is that extending out to the
centreline of the “O”-ring or gasket.
4.5.2 Diaphragm (see 6.4.2)
All diaphragms used in pressure reducing valves shall not leak, tear or rupture when tested in
accordance with 6.4.2.
© ISO 2020 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 6182-17:2020(E)
4.6 Access for maintenance
Means shall be provided to permit access to working parts and removal of the sealing assembly. Any
method adopted shall permit ready maintenance by one person.
4.7 Components
4.7.1 Any component of the pressure reducing valve and associated devices that is normally
disassembled during servicing shall be designed so that it cannot be reassembled improperly without
providing an external visual indication when the valve is returned to service. The main valve servicing
shall be possible in-line, without need of dismounting.
4.7.2 With the exception of valve seats, all parts intended for field replacement shall be capable of
being disassembled and reassembled using tools normally employed by the trade.
4.7.3 All components shall be non-detachable during normal operation of the valve.
4.7.4 Failure of the sealing assembly diaphragms or seals shall not prevent the valve from opening.
4.7.5 Springs and diaphragms shall not fracture or rupture when tested in accordance with 6.2.
4.7.6 There shall be no sign, on visual examination, of damage to the sealing assembly after testing for
the operational requirements of 4.12 in accordance with 6.8.
4.7.7 When wide open, the sealing assembly shall bear against a definite stop. The opening of the valve
or reaction of the water shall not permanently twist, bend or fracture valve parts.
4.7.8 Where rotation or sliding motion is required, the part or its bearing shall be made of a corrosion-
resistant materials. Materials lacking corrosion resistance shall be fitted with bushings, inserts or other
parts made of corrosion-resistant materials at those points where freedom of movement is required.
4.7.9 If an orifice with a diameter less than 5 mm is used in the trim or operation of a valve, a screen
or strainer with corrosion resistance equivalent to brass shall be provided. The total area of openings in
the screen or strainer shall be not less than 20 times the cross-sectional area of the opening of the screen
or strainer it is
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 6182-17
ISO/TC 21/SC 5
Fire protection — Automatic sprinkler
Secretariat: ANSI
systems —
Voting begins on:
2020-04-28
Part 17:
Voting terminates on:
Requirements and test methods for
2020-06-23
pressure reducing valves
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 6182-17:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 6182-17:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 6182-17:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 Nominal sizes and tolerances . 2
4.2 Connections . 2
4.3 Rated working pressure . 3
4.4 Body and cover . 3
4.5 Strength (see 6.4.1) . 3
4.5.1 Body (see 6.4.1) . 3
4.5.2 Diaphragm (see 6.4.2) . 3
4.6 Access for maintenance . 4
4.7 Components . 4
4.8 Leakage and deformation (6.3) . 5
4.9 Non-metallic components (excluding gaskets, diaphragms, seals and other
elastomeric parts) (see 6.5 and 6.6) . 5
4.10 Sealing assembly elements (see 6.7). 5
4.11 Clearances . 5
4.12 Operation (see 6.8) . 5
4.13 Static leakage (see 6.9). 6
4.14 Durability (see 6.10) . 6
5 Production testing and quality control . 6
6 Tests . 6
6.1 Samples . 6
6.2 Spring and diaphragm . 6
6.2.1 Spring. 6
6.2.2 Diaphragm . 7
6.3 Leakage and deformation (see 4.8) . 7
6.3.1 Body leakage (see 4.8.1) . 7
6.3.2 Sealing assembly (see 4.8.2) . 7
6.3.3 Stem seal and repacking leakage (see 4.8.3) . 7
6.4 Strength (see 4.5) . 7
6.4.1 Body (see 4.5.1) . 7
6.4.2 Diaphragms (see 4.5.2) . 7
6.5 Warm-water ageing test for non-metallic components (excluding gaskets, seals
and other elastomeric components) (see 4.9) . 7
6.6 Air ageing test for non-metallic components (excluding gaskets, seals and other
elastomeric components) (see 4.9) . 8
6.7 Sealing element tests (see 4.10) . 8
6.8 Operation (see 4.12) . 9
6.9 Static leakage (90 days) (see 4.13) . 9
6.10 Durability (see 4.14) .10
7 Marking .10
8 Manufacturer’s installation instructions .10
Annex A (normative) Tolerances .12
Bibliography .13
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 6182-17:2020(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC 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 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. 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 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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 5, Fixed firefighting systems using water.
A list of all parts in the ISO 6182 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 6182-17:2020(E)
Fire protection — Automatic sprinkler systems —
Part 17:
Requirements and test methods for pressure reducing
valves
1 Scope
This document specifies performance requirements, methods of test and marking requirements for
pressure reducing valves intended to reduce the downstream water pressure in the piping for water-
based fire protection systems. Within the context of this document, pressure reducing valves include
both pilot operated pressure reducing valves and direct acting pressure reducing valves. Performance
and test requirements for other auxiliary components or attachments to pressure reducing valves are
not within the scope of this document.
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 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws
and studs with specified property classes — Coarse thread and fine pitch thread
ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 2: Nuts with
specified property classes — Coarse thread and fine pitch thread
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
corrosion-resistant material
®1)
bronze, brass, Monel metal, austenitic stainless steel, or equivalent, or plastic material conforming
with the requirements of this document
®
1) Monel is a trademark of Special Metals Corporation and is an example of a suitable product available
commercially. This information is given for the convenience of users of this document and does not constitute an
endorsement by ISO of this product. Equivalent products may be used if they can be shown to lead to the same
results.
© ISO 2020 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO/FDIS 6182-17:2020(E)
3.2
direct acting pressure reducing valve
pressure reducing valve utilizing a diaphragm or spring that responds directly to variations in
downstream pressure to provide the necessary flow and pressure to a system
Note 1 to entry: Direct acting valves are subject to reduced pressure falloff where a decrease in downstream
regulated pressure can occur when the flow increases.
3.3
main valve
part of the valve assembly that controls the flow of water
3.4
minimum opening pressure
pressure at which the valve is intended to start the flow of water
3.5
pilot valve
part of the valve assembly that controls the operating of the main valve (3.3)
3.6
pilot operated pressure reducing valve
hydraulically operated pressure reducing valve which reduces the water pressure in a fire protection
system to a constant, specific value
Note 1 to entry: A pilot operated pressure reducing valve consists of a main valve (3.3) connected to a pilot valve
(3.5) that is capable of changing the position of the closing mechanism in the valve in response to a change in the
pre-set pressure.
3.7
pressure reducing valve
valve designed for the purpose of reducing the downstream water pressure under both flowing and
nonflowing conditions
3.8
rated working pressure
maximum service pressure at which a valve is intended to operate
3.9
stuffing box
open area around the valve stem that is filled with the packing seal
4 Requirements
4.1 Nominal sizes and tolerances
4.1.1 The nominal size of a pressure reducing valve shall be the nominal diameter of the inlet and
outlet connections, i.e. the pipe size for which the connections are intended. The sizes shall be 40 mm,
50 mm, 65 mm, 80 mm, 100 mm, 125 mm, 150 mm, 200 mm, 250 mm or 300 mm.
4.1.2 Unless otherwise noted in a specific clause or subclause of this document, tolerances shall be in
accordance with Annex A.
4.2 Connections
4.2.1 All connections shall be designed for use at the rated working pressure of the valve.
2 © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
ISO/FDIS 6182-17:2020(E)
4.2.2 The dimensions of all connections shall conform with the applicable requirements of relevant
international standards. If international standards are not applicable, national standards may to be used.
For example, ISO 6182-12 contains requirements for grooved-end components. Where there is not an
ISO standard developed, a national standard may be used for other connection types (i.e. threaded,
flanged, or other suitable connections).
4.3 Rated working pressure
4.3.1 The rated working pressure shall be not less than 1,2 MPa (12 bar).
4.3.2 Connections may be machined for lower working pressures to match installation equipment
provided the valve is marked with the lower working pressure, as per 7.3 f).
4.4 Body and cover
4.4.1 The body and cover shall be made of a material with corrosion resistance at least equivalent to
cast iron.
4.4.2 Cover fasteners shall be made of steel, stainless steel, titanium, or other materials with equivalent
physical and mechanical properties.
4.4.3 Non-metallic materials other than gaskets, diaphragms and seals or metals with a melting point
less than 800 °C shall not form part of the valve body or cover.
4.4.4 It shall not be possible to assemble the valve with the cover plate in a position which either
improperly indicates flow direction or prevents proper operation of the valve.
4.5 Strength (see 6.4.1)
4.5.1 Body (see 6.4.1)
An assembled pressure reducing valve with the sealing assembly blocked open shall withstand, without
rupture, an internal hydrostatic pressure of four times the rated working pressure for a period of 5 min
when tested as specified in 6.4.1.
If the test is not performed with standard production fasteners, the supplier shall provide documentation
showing that the calculated design load of any fastener, neglecting the force required to compress the
gasket, shall not exceed the minimum tensile strength specified in ISO 898-1 and ISO 898-2, when the
valve is pressurized to four times the rated working pressure. The area of the application of pressure
shall be calculated as follows.
a) If a full-face gasket is used, the area of application of pressure is that extending out to a line defined
by the inner edge of the bolts.
b) If an “O”-ring seal or ring gasket is used, the area of application of force is that extending out to the
centreline of the “O”-ring or gasket.
4.5.2 Diaphragm (see 6.4.2)
All diaphragms used in pressure reducing valves shall not leak, tear or rupture when tested in
accordance with 6.4.2.
© ISO 2020 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO/FDIS 6182-17:2020(E)
4.6 Access for maintenance
Means shall be provided to permit access to working parts and removal of the sealing assembly. Any
method adopted shall permit ready maintenance by one person.
4.7 Components
4.7.1 Any component of the pressure reducing valve and associated devices that is normally
disassembled during servicing shall be designed so that it cannot be reassembled improperly without
providing an external visual indication when the valve is returned to service. The main valve servicing
shall be possible in-line, without need of dismounting.
4.7.2 With the exception of valve seats, all parts intended for field replacement shall be capable of
being disassembled and reassembled using tools normally employed by the trade.
4.7.3 All components shall be non-detachable during normal operation of the valve.
4.7.4 Failure of the sealing assembly diaphragms or seals shall not prevent the valve from opening.
4.7.5 Springs and diaphragms shall not fracture or rupture when tested in accordance with 6.2.
4.7.6 There shall be no sign, on visual examination, of damage to the sealing assembly after testing for
the operational requirements of 4.12 in accordance with 6.8.
4.7.7 When wide open, the sealing assembly shall bear against a definite stop. The opening of the valve
or reaction of the water shall not permanently twist, bend or fracture valve parts.
4.7.8 Where rotation or sliding motion is required, the part or its bearing shall be made of a corrosion-
resistant materials. Materials lacking corrosion resistance shall be fitted with bushings, inserts or other
parts made of corrosion-resistant ma
...
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