ISO 15761:2002
Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum and natural gas industries
ISO 15761 specifies the requirements for a series of compact steel gate, globe and check valves for petroleum and natural gas industry applications. It is applicable to valves of nominal sizes (DN) 8, 10, 15, 20, 25, 32, 40, 50, 65, 80 and 100, to corresponding nominal sizes, to nominal pipe sizes (NPS) of a quarter, three eighths, half, three quarters, one, one and a quarter, one and a half, two, two and a half, three and four, and to pressure designation classes 150, 300, 600, 800 and 1500. It includes provisions for a wide range of valve characteristics and is applicable to valve end flanges in accordance with ASME B16.5 and valve body ends having tapered pipe threads to ISO 7-1 or ASME B1.20.1.
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TitlePage - Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum an...
TableofContent - Contents Page
Foreword - Foreword
Introduction - Introduction
Scope - 1 Scope
NormativeReference - 2 Normative references
Clause1 - 4 Pressure/temperature ratings
Subclause2 - 4.1 Valve ratings
Subclause3 - 4.1.1 Applicability
Subclause3 - 4.1.2 Interpolated ratings
Subclause2 - 4.2 Temperature constraints
UntitledSubclause3 - 4.2.1 The temperature for a corresponding pressure rating is the maximum ...
UntitledSubclause3 - 4.2.2 Restrictions of temperature and pressure, for example those imposed...
UntitledSubclause3 - 4.2.3 For temperatures below the lowest temperature listed in the pressur...
Clause1 - 5 Design
Subclause2 - 5.1 Reference design
UntitledSubclause3 - 5.1.1 The reference design (the design to be provided when the purchaser ...
UntitledSubclause3 - 5.1.2 Other configurations and types of material may be provided when spe...
Subclause2 - 5.2 Flow passageway
UntitledSubclause3 - 5.2.1 The flow passageway includes the seat opening and the body ports le...
UntitledSubclause3 - 5.2.2 The minimum cross-sectional area requirement for the flow passagewa...
Subclause2 - 5.3 Wall thickness
UntitledSubclause3 - 5.3.1 Minimum wall thickness values for valve bodies and bonnets are give...
UntitledSubclause3 - 5.3.2 The valve-body specified minimum wall thickness, except for the val...
UntitledSubclause3 - 5.3.3 The bonnet specified minimum wall thickness for gate or globe valve...
Subclause2 - 5.4 Valve body
Subclause3 - 5.4.1 General
Subclause3 - 5.4.2 Socket-welding ends
UntitledSubclause4 - 5.4.2.1 The socket bore axis shall coincide with the end entry axis. Sock...
UntitledSubclause4 - 5.4.2.2 The minimum socket wall thickness, extending over the full socket...
UntitledSubclause4 - 5.4.2.3 End-to-end dimensions for socket welding end valves shall be esta...
Subclause3 - 5.4.3 Threaded ends
UntitledSubclause4 - 5.4.3.1 The threaded end thread axis shall coincide with the end entry ax...
UntitledSubclause4 - 5.4.3.2 The end threads shall be taper pipe threads meeting the requireme...
UntitledSubclause4 - 5.4.3.3 Threads shall be gauged in accordance with
UntitledSubclause4 - 5.4.3.4 End-to-end dimensions for threaded end valves shall be establishe...
Subclause3 - 5.4.4 Flanged ends
UntitledSubclause4 - 5.4.4.1 End flanges shall comply with the dimensional requirements of ASM...
UntitledSubclause4 - 5.4.4.2 End flanges and bonnet flanges shall be cast or forged integral w...
UntitledSubclause4 - 5.4.4.3 Face-to-face dimensions for flanged end valves, Class150, Class...
Subclause3 - 5.4.5 Butt-welding ends
UntitledSubclause4 - 5.4.5.1 Unless otherwise specified by the purchaser, butt-welding ends sh...
UntitledSubclause4 - 5.4.5.2 End-to-end dimensions for butt-welding end valves shall be establ...
Subclause3 - 5.4.6 Body seats
UntitledSubclause4 - 5.4.6.1 Integral body seats are permitted in austenitic stainless steel b...
UntitledSubclause4 - 5.4.6.2 Except as provided in
UntitledSubclause4 - 5.4.6.3 The inside diameter of the body seat flow passageway shall be in ...
Subclause2 - 5.5 Valve bonnet or cover
UntitledSubclause3 - 5.5.1 The bonnet of a gate or globe valve or the cover of a check valve s...
UntitledSubclause3 - 5.5.2 Gasketed joints shall be of a design that confines the gasket and p...
UntitledSubclause3 - 5.5.3 Bonnet flange gaskets, unless otherwise specified by the purchaser,...
UntitledSubclause3 - 5.5.4 Bonnet and body flange bolting bearing surfaces shall be parallel t...
UntitledSubclause3 - 5.5.5 A bolted bonnet or cover to the body joint shall be secured by a mi...
UntitledSubclause3 - 5.5.6 The bolting shall, as a minimum, meet the following bolt cross-sect...
UntitledSubclause3 - 5.5.7 Threaded pressure-retaining joints shall, as a minimum, meet the fo...
UntitledSubclause3 - 5.5.8 Bonnets welded directly to valve bodies shall be secured by a full ...
Subclause2 - 5.6 Obturator
Subclause3 - 5.6.1 Seating surfaces
Subclause3 - 5.6.2 Gate valve obturators
UntitledSubclause4 - 5.6.2.1 Gate valves shall be provided with a one-piece wedge gate. The in...
UntitledSubclause4 - 5.6.2.2 A slot near the top of the wedge gate shall be provided to receiv...
UntitledSubclause4 - 5.6.2.3 The wedge gate shall be designed to account for seat wear. The di...
Subclause3 - 5.6.3 Globe valve obturators
UntitledSubclause4 - 5.6.3.1 Globe valves shall be provided with disks that are non-integral w...
UntitledSubclause4 - 5.6.3.2 When assembled, the globe valve disk-to-stem retaining design sha...
Subclause3 - 5.6.4 Check valve obturators
UntitledSubclause4 - 5.6.4.1 Check valves shall be provided with either piston, ball or swing ...
UntitledSubclause4 - 5.6.4.2 Piston type and ball type check valve obturators shall be guided ...
UntitledSubclause4 - 5.6.4.3 Piston check and ball check valves shall be designed so that, whe...
UntitledSubclause4 - 5.6.4.4 Obturator-to-hinge retaining nuts shall be positively secured by ...
Subclause2 - 5.7 Stem
UntitledSubclause3 - 5.7.1 Stems are designated as either inside screw (ISRS) or outside screw...
UntitledSubclause3 - 5.7.2 The minimum stem diameter,
UntitledSubclause3 - 5.7.3 The stem shall be one-piece wrought material. Stems fabricated by w...
UntitledSubclause3 - 5.7.4 The stem threads shall be of trapezoidal form in accordance with
UntitledSubclause3 - 5.7.5 The means of stem-to-obturator attachment shall be designed so as t...
UntitledSubclause3 - 5.7.6 Valve stems, except those used in globe valves where the backseat f...
UntitledSubclause3 - 5.7.7 Gate valve stem design shall be such that, for valves with outside ...
UntitledSubclause3 - 5.7.8 The means of stem disk attachment in globe valves shall be such tha...
Subclause2 - 5.8 Stem nut or stem bushing
UntitledSubclause3 - 5.8.1 The internal thread in the stem nut (yoke sleeve or stem bushing) s...
UntitledSubclause3 - 5.8.2 The fixed stem nut used in globe valves shall be threaded or otherw...
Subclause2 - 5.9 Packing, packing chamber and gland
UntitledSubclause3 - 5.9.1 The minimum uncompressed total height of the installed packing,
UntitledSubclause3 - 5.9.2 The packing chamber bore shall have a surface finish,
UntitledSubclause3 - 5.9.3 A gland shall be provided for packing compression. The gland may be...
UntitledSubclause3 - 5.9.4 Packing in the form of a single-piece spiral shall not be used.
Subclause2 - 5.10 Packing retention
UntitledSubclause3 - 5.10.1 Packing and packing gland retention for valves with outside screw ...
UntitledSubclause3 - 5.10.2 Gland flange bolts shall be hinged eyebolts, headed bolts, stud bo...
UntitledSubclause3 - 5.10.3 The gland bolting for gate and globe valves shall not be anchored ...
UntitledSubclause3 - 5.10.4 Packing and packing gland retention for valves with inside screw s...
Subclause2 - 5.11 Hand wheel
UntitledSubclause3 - 5.11.1 Gate and globe valves shall be supplied with direct operated hand ...
UntitledSubclause3 - 5.11.2 The hand wheel shall be a spoke and rim design that makes an effec...
UntitledSubclause3 - 5.11.3 The hand wheel shall be secured to the stem or stem nut by a threa...
Clause1 - 6 Materials
Subclause2 - 6.1 Trim materials
UntitledSubclause3 - 6.1.1 Trim items include the stem, the obturator seat surfaces and the bo...
UntitledSubclause3 - 6.1.2 Trims of free machining grades of 13Cr steel (grades containing add...
UntitledSubclause3 - 6.1.3 The trim material shall be the manufacturer's standard trim materia...
Subclause2 - 6.2 Materials other than trim
UntitledSubclause3 - 6.2.1 Materials for valve parts other than trim items shall be in accorda...
UntitledSubclause3 - 6.2.2 Defects in the cast or forged valve pressure shell materials reveal...
UntitledSubclause3 - 6.2.3 Fabrication welding operations shall be performed by qualified weld...
Clause1 - 7 Marking
Subclause2 - 7.1 Legibility
Subclause2 - 7.2 Body marking
UntitledSubclause3 - 7.2.1 Valve bodies shall be marked with the following information:
UntitledSubclause3 - 7.2.2 For valves
Subclause2 - 7.3 Ring joint groove marking
Subclause2 - 7.4 Identification plate marking
Clause1 - 8 Testing and inspection
Subclause2 - 8.1 Pressure tests
Subclause3 - 8.1.1 General
UntitledSubclause4 - 8.1.1.1 Each assembled valve identified with
UntitledSubclause4 - 8.1.1.2 When water is used as the test fluid for pressure testing austeni...
Subclause3 - 8.1.2 Shell test
UntitledSubclause4 - 8.1.2.1 The shell test for each valve shall be at a pressure no less than...
UntitledSubclause4 - 8.1.2.2 Paint or other coating materials capable of concealing leakage du...
UntitledSubclause4 - 8.1.2.3 The minimum period of time that the shell test pressure is to be ...
UntitledSubclause4 - 8.1.2.4 Over the duration of the shell test there shall be no visually de...
Subclause3 - 8.1.3 Closure leakage test
UntitledSubclause4 - 8.1.3.1 For each gate valve, the closure test shall be a gas test with th...
UntitledSubclause4 - 8.1.3.2 For each check valve and globe valve the closure test shall be a ...
UntitledSubclause4 - 8.1.3.3 Gate and globe valve stem packing shall be adjusted so that there...
UntitledSubclause4 - 8.1.3.4 The minimum period of time that the test pressure is to be sustai...
UntitledSubclause4 - 8.1.3.5 Over the duration of the closure test, the maximum permitted seat...
UntitledSubclause4 - 8.1.3.6 When volumetric devices are used to measure seat leakage rates th...
UntitledSubclause4 - 8.1.3.7 Gate valves, for which only a low pressure gas test is specified,...
Subclause3 - 8.1.4 Optional closure leakage test for gate valves
Subclause3 - 8.1.5 Backseat leakage test
UntitledSubclause4 - 8.1.5.1 The backseat test for gate and globe valves shall be either a gas...
UntitledSubclause4 - 8.1.5.2 The stem backseat shall be engaged and the packing gland bolting ...
UntitledSubclause4 - 8.1.5.3 The gland bolting or packing nut shall be re-tightened following ...
Subclause2 - 8.2 Inspection
Clause1 - 9 Preparation for despatch
UntitledSubclause2 - 9.1 After testing, the test fluid shall be drained from each valve in pre...
UntitledSubclause2 - 9.2 Stem packing shall be in place and the remaining packing adjustment, ...
UntitledSubclause2 - 9.3 Except for austenitic stainless steel valves, unmachined exterior val...
UntitledSubclause2 - 9.4 Except for austenitic stainless steel valves, machined or threaded su...
UntitledSubclause2 - 9.5 Protective covers or caps of wood, wood fibre, plastic or metal shall...
UntitledSubclause2 - 9.6 Protective end plugs of wood, wood fibre, plastic or metal shall be s...
UntitledSubclause2 - 9.7 At the time of shipment, the obturator of a gate or a globe valve sha...
UntitledSubclause2 - 9.8 When special packaging is necessary, the purchaser shall specify the ...
AnnexNormative - Requirements for extended body gate valve bodies
Clause1 - A.1 Scope
Clause1 - A.2 Applicability
UntitledSubclause2 - A.2.1 Extensions with external taper pipe threads are designated only for...
UntitledSubclause2 - A.2.2 Extensions with external weld end preparations are designated only ...
UntitledSubclause2 - A.2.3 Internal socket welding ends or internal taper pipe thread ends are...
UntitledSubclause2 - A.2.4 Extended bodies covered by
Clause1 - A.3 Body configuration
Subclause2 - A.3.1 Extension length
Subclause2 - A.3.2 Extensions having threaded ends
Subclause2 - A.3.3 Extensions having welding ends
Clause1 - A.4 Materials
Clause1 - A.5 Body extension construction
UntitledSubclause2 - A.5.1 An extension shall be either cast or forged integral with the valve...
UntitledSubclause2 - A.5.2 Integral alignment rings (centring backing rings) used to facilitat...
UntitledSubclause2 - A.5.3 The final wall thickness of the extension attachment weld shall not...
UntitledSubclause2 - A.5.4 The body-to-extension weld shall be given a post-weld heat treatmen...
UntitledSubclause2 - A.5.5 The finished weld shall be free of cracks and shall show no indicat...
Clause1 - A.6 Marking
AnnexNormative - Requirements for valves with bellows stem seals
Clause1 - B.1 Scope
Clause1 - B.2 Design
UntitledSubclause2 - B.2.1 Bellows stem seals do not eliminate the need for providing the stem...
UntitledSubclause2 - B.2.2 One end of the bellows shall be attached to the stem just above the...
UntitledSubclause2 - B.2.3 Stems in bellows-equipped valves shall be provided with the means t...
UntitledSubclause2 - B.2.4 Valve-to-bellows assemblies shall be designed so that the bellows c...
Clause1 - B.3 Pressure-temperature ratings
UntitledSubclause2 - B.3.1 The bellows assembly for a bellows stem seal valve shall be designe...
UntitledSubclause2 - B.3.2 For fluid service above
UntitledSubclause2 - B.3.3 Restrictions of temperature or pressure imposed by the bellows asse...
UntitledSubclause2 - B.3.4 A bellows stem seal valve shall be limited to applications where te...
Clause1 - B.4 Extensions for bellows enclosure
UntitledSubclause2 - B.4.1 The cylindrical bonnet or body extension required to enclose a bell...
UntitledSubclause2 - B.4.2 The bonnet or body extension that envelops the bellows shall be int...
UntitledSubclause2 - B.4.3 The weld for an extension that is welded directly to the bonnet or ...
Clause1 - B.5 Type testing
UntitledSubclause2 - B.5.1 The adequacy of each design of bellows and its means of attachment,...
UntitledSubclause2 - B.5.2 A bellows assembly design change that alters cyclic life demonstrat...
UntitledSubclause2 - B.5.3 When the bellows or bellows assembly manufacturer is changed, or th...
UntitledSubclause2 - B.5.4 A change in the number of convolutions of a qualified bellows (incr...
UntitledSubclause2 - B.5.5 A bellows valve shall be designed such that the qualified extension...
Clause1 - B.6 Materials
UntitledSubclause2 - B.6.1 Some services may require special bellows materials. When specified...
UntitledSubclause2 - B.6.2 Fabrication welding operations related to bellows or bellows assemb...
UntitledSubclause2 - B.6.3 Bellows assemblies, as received from the bellows manufacturer, shal...
Clause1 - B.7 Pressure tests
UntitledSubclause2 - B.7.1 Prior to assembly, each bellows or bellows assembly shall be tested...
UntitledSubclause2 - B.7.2 Pressure tests for bellows stem seal valves, with the manufacturer ...
UntitledSubclause2 - B.7.3 When water is used as the test fluid for pressure testing valves ha...
UntitledSubclause2 - B.7.4 A backseat test is not required for a valve with a bellows stem seal.
Clause1 - B.8 Marking
UntitledSubclause2 - B.8.1 Each bellows assembly shall have a material identification marking.
UntitledSubclause2 - B.8.2 The bellows material marking shall appear on the valve identificati...
Clause1 - B.9 Preparation for despatch
AnnexNormative - Type testing of bellows stem seals
Clause1 - C.1 Scope
Clause1 - C.2 General requirements
UntitledSubclause2 - C.2.1 The bellows is the expandable metal part that acts as the initial s...
UntitledSubclause2 - C.2.2 Each bellows assembly design and each bellows material shall be qua...
UntitledSubclause2 - C.2.3 A successful qualification requires that three bellows assemblies o...
Clause1 - C.3 Test procedure
Subclause2 - C.3.1 Pre-test examination
UntitledSubclause3 - C.3.1.1 The bellows assemblies to be tested shall be clean.
UntitledSubclause3 - C.3.1.2 The unrestrained (free) height of each bellows shall be measured ...
UntitledSubclause3 - C.3.1.3 All bellows assembly welds shall be examined using a liquid dye p...
UntitledSubclause3 - C.3.1.4 Each bellows assembly shall be subjected to a helium leakage test...
Subclause2 - C.3.2 Pressure test
UntitledSubclause3 - C.3.2.1 Each bellows assembly shall be pressure tested.
UntitledSubclause3 - C.3.2.2 The pressure test fluid shall be water containing less than
UntitledSubclause3 - C.3.2.3 For the pressure test, the bellows shall be positioned at its ext...
UntitledSubclause3 - C.3.2.4 The test fluid pressure shall be applied in the same direction (e...
UntitledSubclause3 - C.3.2.5 The test fluid pressure shall be not less than 1,5times the rate...
UntitledSubclause3 - C.3.2.6 The minimum pressure test duration shall be
UntitledSubclause3 - C.3.2.7 Any visually detectable leakage over the test duration shall be c...
Subclause2 - C.3.3 Cycle test
UntitledSubclause3 - C.3.3.1 Each bellows assembly shall be cycle tested.
UntitledSubclause3 - C.3.3.2 For the cycle test, the bellows assembly shall be installed in ei...
UntitledSubclause3 - C.3.3.3 The frequency of cycling shall not exceed one cycle per second.
UntitledSubclause3 - C.3.3.4 One complete cycle is defined as movement of the bellows from the...
UntitledSubclause3 - C.3.3.5 The ambient cycle test cycling shall be carried out at ambient te...
UntitledSubclause3 - C.3.3.6 Water containing less than
UntitledSubclause3 - C.3.3.7 The minimum number of test cycles required for qualification for ...
Subclause2 - C.3.4 Post test examination
UntitledSubclause3 - C.3.4.1 Upon completion of the cycle test, repeat the liquid dye penetran...
UntitledSubclause3 - C.3.4.2 After the liquid dye penetrant examination, each bellows assembly...
UntitledSubclause3 - C.3.4.3 Any detectable leakage either from the bellows or the bellows ass...
Clause1 - C.4 Acceptability
Clause1 - C.5 Test report
AnnexInformative - Identification of valve parts
AnnexInformative - Information to be specified by the purchaser
Bibliography - Bibliography
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TitlePage - Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum an...
TableofContent - Contents Page
Foreword - Foreword
Introduction - Introduction
Scope - 1 Scope
NormativeReference - 2 Normative references
Clause1 - 4 Pressure/temperature ratings
Subclause2 - 4.1 Valve ratings
Subclause3 - 4.1.1 Applicability
Subclause3 - 4.1.2 Interpolated ratings
Subclause2 - 4.2 Temperature constraints
UntitledSubclause3 - 4.2.1 The temperature for a corresponding pressure rating is the maximum ...
UntitledSubclause3 - 4.2.2 Restrictions of temperature and pressure, for example those imposed...
UntitledSubclause3 - 4.2.3 For temperatures below the lowest temperature listed in the pressur...
Clause1 - 5 Design
Subclause2 - 5.1 Reference design
UntitledSubclause3 - 5.1.1 The reference design (the design to be provided when the purchaser ...
UntitledSubclause3 - 5.1.2 Other configurations and types of material may be provided when spe...
Subclause2 - 5.2 Flow passageway
UntitledSubclause3 - 5.2.1 The flow passageway includes the seat opening and the body ports le...
UntitledSubclause3 - 5.2.2 The minimum cross-sectional area requirement for the flow passagewa...
Subclause2 - 5.3 Wall thickness
UntitledSubclause3 - 5.3.1 Minimum wall thickness values for valve bodies and bonnets are give...
UntitledSubclause3 - 5.3.2 The valve-body specified minimum wall thickness, except for the val...
UntitledSubclause3 - 5.3.3 The bonnet specified minimum wall thickness for gate or globe valve...
Subclause2 - 5.4 Valve body
Subclause3 - 5.4.1 General
Subclause3 - 5.4.2 Socket-welding ends
UntitledSubclause4 - 5.4.2.1 The socket bore axis shall coincide with the end entry axis. Sock...
UntitledSubclause4 - 5.4.2.2 The minimum socket wall thickness, extending over the full socket...
UntitledSubclause4 - 5.4.2.3 End-to-end dimensions for socket welding end valves shall be esta...
Subclause3 - 5.4.3 Threaded ends
UntitledSubclause4 - 5.4.3.1 The threaded end thread axis shall coincide with the end entry ax...
UntitledSubclause4 - 5.4.3.2 The end threads shall be taper pipe threads meeting the requireme...
UntitledSubclause4 - 5.4.3.3 Threads shall be gauged in accordance with
UntitledSubclause4 - 5.4.3.4 End-to-end dimensions for threaded end valves shall be establishe...
Subclause3 - 5.4.4 Flanged ends
UntitledSubclause4 - 5.4.4.1 End flanges shall comply with the dimensional requirements of ASM...
UntitledSubclause4 - 5.4.4.2 End flanges and bonnet flanges shall be cast or forged integral w...
UntitledSubclause4 - 5.4.4.3 Face-to-face dimensions for flanged end valves, Class150, Class...
Subclause3 - 5.4.5 Butt-welding ends
UntitledSubclause4 - 5.4.5.1 Unless otherwise specified by the purchaser, butt-welding ends sh...
UntitledSubclause4 - 5.4.5.2 End-to-end dimensions for butt-welding end valves shall be establ...
Subclause3 - 5.4.6 Body seats
UntitledSubclause4 - 5.4.6.1 Integral body seats are permitted in austenitic stainless steel b...
UntitledSubclause4 - 5.4.6.2 Except as provided in
UntitledSubclause4 - 5.4.6.3 The inside diameter of the body seat flow passageway shall be in ...
Subclause2 - 5.5 Valve bonnet or cover
UntitledSubclause3 - 5.5.1 The bonnet of a gate or globe valve or the cover of a check valve s...
UntitledSubclause3 - 5.5.2 Gasketed joints shall be of a design that confines the gasket and p...
UntitledSubclause3 - 5.5.3 Bonnet flange gaskets, unless otherwise specified by the purchaser,...
UntitledSubclause3 - 5.5.4 Bonnet and body flange bolting bearing surfaces shall be parallel t...
UntitledSubclause3 - 5.5.5 A bolted bonnet or cover to the body joint shall be secured by a mi...
UntitledSubclause3 - 5.5.6 The bolting shall, as a minimum, meet the following bolt cross-sect...
UntitledSubclause3 - 5.5.7 Threaded pressure-retaining joints shall, as a minimum, meet the fo...
UntitledSubclause3 - 5.5.8 Bonnets welded directly to valve bodies shall be secured by a full ...
Subclause2 - 5.6 Obturator
Subclause3 - 5.6.1 Seating surfaces
Subclause3 - 5.6.2 Gate valve obturators
UntitledSubclause4 - 5.6.2.1 Gate valves shall be provided with a one-piece wedge gate. The in...
UntitledSubclause4 - 5.6.2.2 A slot near the top of the wedge gate shall be provided to receiv...
UntitledSubclause4 - 5.6.2.3 The wedge gate shall be designed to account for seat wear. The di...
Subclause3 - 5.6.3 Globe valve obturators
UntitledSubclause4 - 5.6.3.1 Globe valves shall be provided with disks that are non-integral w...
UntitledSubclause4 - 5.6.3.2 When assembled, the globe valve disk-to-stem retaining design sha...
Subclause3 - 5.6.4 Check valve obturators
UntitledSubclause4 - 5.6.4.1 Check valves shall be provided with either piston, ball or swing ...
UntitledSubclause4 - 5.6.4.2 Piston type and ball type check valve obturators shall be guided ...
UntitledSubclause4 - 5.6.4.3 Piston check and ball check valves shall be designed so that, whe...
UntitledSubclause4 - 5.6.4.4 Obturator-to-hinge retaining nuts shall be positively secured by ...
Subclause2 - 5.7 Stem
UntitledSubclause3 - 5.7.1 Stems are designated as either inside screw (ISRS) or outside screw...
UntitledSubclause3 - 5.7.2 The minimum stem diameter,
UntitledSubclause3 - 5.7.3 The stem shall be one-piece wrought material. Stems fabricated by w...
UntitledSubclause3 - 5.7.4 The stem threads shall be of trapezoidal form in accordance with
UntitledSubclause3 - 5.7.5 The means of stem-to-obturator attachment shall be designed so as t...
UntitledSubclause3 - 5.7.6 Valve stems, except those used in globe valves where the backseat f...
UntitledSubclause3 - 5.7.7 Gate valve stem design shall be such that, for valves with outside ...
UntitledSubclause3 - 5.7.8 The means of stem disk attachment in globe valves shall be such tha...
Subclause2 - 5.8 Stem nut or stem bushing
UntitledSubclause3 - 5.8.1 The internal thread in the stem nut (yoke sleeve or stem bushing) s...
UntitledSubclause3 - 5.8.2 The fixed stem nut used in globe valves shall be threaded or otherw...
Subclause2 - 5.9 Packing, packing chamber and gland
UntitledSubclause3 - 5.9.1 The minimum uncompressed total height of the installed packing,
UntitledSubclause3 - 5.9.2 The packing chamber bore shall have a surface finish,
UntitledSubclause3 - 5.9.3 A gland shall be provided for packing compression. The gland may be...
UntitledSubclause3 - 5.9.4 Packing in the form of a single-piece spiral shall not be used.
Subclause2 - 5.10 Packing retention
UntitledSubclause3 - 5.10.1 Packing and packing gland retention for valves with outside screw ...
UntitledSubclause3 - 5.10.2 Gland flange bolts shall be hinged eyebolts, headed bolts, stud bo...
UntitledSubclause3 - 5.10.3 The gland bolting for gate and globe valves shall not be anchored ...
UntitledSubclause3 - 5.10.4 Packing and packing gland retention for valves with inside screw s...
Subclause2 - 5.11 Hand wheel
UntitledSubclause3 - 5.11.1 Gate and globe valves shall be supplied with direct operated hand ...
UntitledSubclause3 - 5.11.2 The hand wheel shall be a spoke and rim design that makes an effec...
UntitledSubclause3 - 5.11.3 The hand wheel shall be secured to the stem or stem nut by a threa...
Clause1 - 6 Materials
Subclause2 - 6.1 Trim materials
UntitledSubclause3 - 6.1.1 Trim items include the stem, the obturator seat surfaces and the bo...
UntitledSubclause3 - 6.1.2 Trims of free machining grades of 13Cr steel (grades containing add...
UntitledSubclause3 - 6.1.3 The trim material shall be the manufacturer's standard trim materia...
Subclause2 - 6.2 Materials other than trim
UntitledSubclause3 - 6.2.1 Materials for valve parts other than trim items shall be in accorda...
UntitledSubclause3 - 6.2.2 Defects in the cast or forged valve pressure shell materials reveal...
UntitledSubclause3 - 6.2.3 Fabrication welding operations shall be performed by qualified weld...
Clause1 - 7 Marking
Subclause2 - 7.1 Legibility
Subclause2 - 7.2 Body marking
UntitledSubclause3 - 7.2.1 Valve bodies shall be marked with the following information:
UntitledSubclause3 - 7.2.2 For valves
Subclause2 - 7.3 Ring joint groove marking
Subclause2 - 7.4 Identification plate marking
Clause1 - 8 Testing and inspection
Subclause2 - 8.1 Pressure tests
Subclause3 - 8.1.1 General
UntitledSubclause4 - 8.1.1.1 Each assembled valve identified with
UntitledSubclause4 - 8.1.1.2 When water is used as the test fluid for pressure testing austeni...
Subclause3 - 8.1.2 Shell test
UntitledSubclause4 - 8.1.2.1 The shell test for each valve shall be at a pressure no less than...
UntitledSubclause4 - 8.1.2.2 Paint or other coating materials capable of concealing leakage du...
UntitledSubclause4 - 8.1.2.3 The minimum period of time that the shell test pressure is to be ...
UntitledSubclause4 - 8.1.2.4 Over the duration of the shell test there shall be no visually de...
Subclause3 - 8.1.3 Closure leakage test
UntitledSubclause4 - 8.1.3.1 For each gate valve, the closure test shall be a gas test with th...
UntitledSubclause4 - 8.1.3.2 For each check valve and globe valve the closure test shall be a ...
UntitledSubclause4 - 8.1.3.3 Gate and globe valve stem packing shall be adjusted so that there...
UntitledSubclause4 - 8.1.3.4 The minimum period of time that the test pressure is to be sustai...
UntitledSubclause4 - 8.1.3.5 Over the duration of the closure test, the maximum permitted seat...
UntitledSubclause4 - 8.1.3.6 When volumetric devices are used to measure seat leakage rates th...
UntitledSubclause4 - 8.1.3.7 Gate valves, for which only a low pressure gas test is specified,...
Subclause3 - 8.1.4 Optional closure leakage test for gate valves
Subclause3 - 8.1.5 Backseat leakage test
UntitledSubclause4 - 8.1.5.1 The backseat test for gate and globe valves shall be either a gas...
UntitledSubclause4 - 8.1.5.2 The stem backseat shall be engaged and the packing gland bolting ...
UntitledSubclause4 - 8.1.5.3 The gland bolting or packing nut shall be re-tightened following ...
Subclause2 - 8.2 Inspection
Clause1 - 9 Preparation for despatch
UntitledSubclause2 - 9.1 After testing, the test fluid shall be drained from each valve in pre...
UntitledSubclause2 - 9.2 Stem packing shall be in place and the remaining packing adjustment, ...
UntitledSubclause2 - 9.3 Except for austenitic stainless steel valves, unmachined exterior val...
UntitledSubclause2 - 9.4 Except for austenitic stainless steel valves, machined or threaded su...
UntitledSubclause2 - 9.5 Protective covers or caps of wood, wood fibre, plastic or metal shall...
UntitledSubclause2 - 9.6 Protective end plugs of wood, wood fibre, plastic or metal shall be s...
UntitledSubclause2 - 9.7 At the time of shipment, the obturator of a gate or a globe valve sha...
UntitledSubclause2 - 9.8 When special packaging is necessary, the purchaser shall specify the ...
AnnexNormative - Requirements for extended body gate valve bodies
Clause1 - A.1 Scope
Clause1 - A.2 Applicability
UntitledSubclause2 - A.2.1 Extensions with external taper pipe threads are designated only for...
UntitledSubclause2 - A.2.2 Extensions with external weld end preparations are designated only ...
UntitledSubclause2 - A.2.3 Internal socket welding ends or internal taper pipe thread ends are...
UntitledSubclause2 - A.2.4 Extended bodies covered by
Clause1 - A.3 Body configuration
Subclause2 - A.3.1 Extension length
Subclause2 - A.3.2 Extensions having threaded ends
Subclause2 - A.3.3 Extensions having welding ends
Clause1 - A.4 Materials
Clause1 - A.5 Body extension construction
UntitledSubclause2 - A.5.1 An extension shall be either cast or forged integral with the valve...
UntitledSubclause2 - A.5.2 Integral alignment rings (centring backing rings) used to facilitat...
UntitledSubclause2 - A.5.3 The final wall thickness of the extension attachment weld shall not...
UntitledSubclause2 - A.5.4 The body-to-extension weld shall be given a post-weld heat treatmen...
UntitledSubclause2 - A.5.5 The finished weld shall be free of cracks and shall show no indicat...
Clause1 - A.6 Marking
AnnexNormative - Requirements for valves with bellows stem seals
Clause1 - B.1 Scope
Clause1 - B.2 Design
UntitledSubclause2 - B.2.1 Bellows stem seals do not eliminate the need for providing the stem...
UntitledSubclause2 - B.2.2 One end of the bellows shall be attached to the stem just above the...
UntitledSubclause2 - B.2.3 Stems in bellows-equipped valves shall be provided with the means t...
UntitledSubclause2 - B.2.4 Valve-to-bellows assemblies shall be designed so that the bellows c...
Clause1 - B.3 Pressure-temperature ratings
UntitledSubclause2 - B.3.1 The bellows assembly for a bellows stem seal valve shall be designe...
UntitledSubclause2 - B.3.2 For fluid service above
UntitledSubclause2 - B.3.3 Restrictions of temperature or pressure imposed by the bellows asse...
UntitledSubclause2 - B.3.4 A bellows stem seal valve shall be limited to applications where te...
Clause1 - B.4 Extensions for bellows enclosure
UntitledSubclause2 - B.4.1 The cylindrical bonnet or body extension required to enclose a bell...
UntitledSubclause2 - B.4.2 The bonnet or body extension that envelops the bellows shall be int...
UntitledSubclause2 - B.4.3 The weld for an extension that is welded directly to the bonnet or ...
Clause1 - B.5 Type testing
UntitledSubclause2 - B.5.1 The adequacy of each design of bellows and its means of attachment,...
UntitledSubclause2 - B.5.2 A bellows assembly design change that alters cyclic life demonstrat...
UntitledSubclause2 - B.5.3 When the bellows or bellows assembly manufacturer is changed, or th...
UntitledSubclause2 - B.5.4 A change in the number of convolutions of a qualified bellows (incr...
UntitledSubclause2 - B.5.5 A bellows valve shall be designed such that the qualified extension...
Clause1 - B.6 Materials
UntitledSubclause2 - B.6.1 Some services may require special bellows materials. When specified...
UntitledSubclause2 - B.6.2 Fabrication welding operations related to bellows or bellows assemb...
UntitledSubclause2 - B.6.3 Bellows assemblies, as received from the bellows manufacturer, shal...
Clause1 - B.7 Pressure tests
UntitledSubclause2 - B.7.1 Prior to assembly, each bellows or bellows assembly shall be tested...
UntitledSubclause2 - B.7.2 Pressure tests for bellows stem seal valves, with the manufacturer ...
UntitledSubclause2 - B.7.3 When water is used as the test fluid for pressure testing valves ha...
UntitledSubclause2 - B.7.4 A backseat test is not required for a valve with a bellows stem seal.
Clause1 - B.8 Marking
UntitledSubclause2 - B.8.1 Each bellows assembly shall have a material identification marking.
UntitledSubclause2 - B.8.2 The bellows material marking shall appear on the valve identificati...
Clause1 - B.9 Preparation for despatch
AnnexNormative - Type testing of bellows stem seals
Clause1 - C.1 Scope
Clause1 - C.2 General requirements
UntitledSubclause2 - C.2.1 The bellows is the expandable metal part that acts as the initial s...
UntitledSubclause2 - C.2.2 Each bellows assembly design and each bellows material shall be qua...
UntitledSubclause2 - C.2.3 A successful qualification requires that three bellows assemblies o...
Clause1 - C.3 Test procedure
Subclause2 - C.3.1 Pre-test examination
UntitledSubclause3 - C.3.1.1 The bellows assemblies to be tested shall be clean.
UntitledSubclause3 - C.3.1.2 The unrestrained (free) height of each bellows shall be measured ...
UntitledSubclause3 - C.3.1.3 All bellows assembly welds shall be examined using a liquid dye p...
UntitledSubclause3 - C.3.1.4 Each bellows assembly shall be subjected to a helium leakage test...
Subclause2 - C.3.2 Pressure test
UntitledSubclause3 - C.3.2.1 Each bellows assembly shall be pressure tested.
UntitledSubclause3 - C.3.2.2 The pressure test fluid shall be water containing less than
UntitledSubclause3 - C.3.2.3 For the pressure test, the bellows shall be positioned at its ext...
UntitledSubclause3 - C.3.2.4 The test fluid pressure shall be applied in the same direction (e...
UntitledSubclause3 - C.3.2.5 The test fluid pressure shall be not less than 1,5times the rate...
UntitledSubclause3 - C.3.2.6 The minimum pressure test duration shall be
UntitledSubclause3 - C.3.2.7 Any visually detectable leakage over the test duration shall be c...
Subclause2 - C.3.3 Cycle test
UntitledSubclause3 - C.3.3.1 Each bellows assembly shall be cycle tested.
UntitledSubclause3 - C.3.3.2 For the cycle test, the bellows assembly shall be installed in ei...
UntitledSubclause3 - C.3.3.3 The frequency of cycling shall not exceed one cycle per second.
UntitledSubclause3 - C.3.3.4 One complete cycle is defined as movement of the bellows from the...
UntitledSubclause3 - C.3.3.5 The ambient cycle test cycling shall be carried out at ambient te...
UntitledSubclause3 - C.3.3.6 Water containing less than
UntitledSubclause3 - C.3.3.7 The minimum number of test cycles required for qualification for ...
Subclause2 - C.3.4 Post test examination
UntitledSubclause3 - C.3.4.1 Upon completion of the cycle test, repeat the liquid dye penetran...
UntitledSubclause3 - C.3.4.2 After the liquid dye penetrant examination, each bellows assembly...
UntitledSubclause3 - C.3.4.3 Any detectable leakage either from the bellows or the bellows ass...
Clause1 - C.4 Acceptability
Clause1 - C.5 Test report
AnnexInformative - Identification of valve parts
AnnexInformative - Information to be specified by the purchaser
Bibliography - Bibliography