1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22194-2 SANS 1808-13:2009Edition 1.2Any reference to SABS 1808-13 is deemedto be a reference to this standard(Government Notice No. 1373 o
4、f 8 November 2002)SOUTH AFRICAN NATIONAL STANDARD Water supply and distribution system components Part 13: Diaphragm valves Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 1808-13:2009
5、Edition 1.2 Table of changes Change No. Date Scope Tech. corr.1 2001 Amended to delete a table. Amdt 2 2009 Amended to change the designation of SABS standards to SANS standards, to update referenced standards, to update the definition of “acceptable”, to update the requirements for fasteners, and t
6、o delete reference to the certification mark. Foreword This South African standard was approved by National Committee SABS SC 138E, Water and sanitation Equipment and systems Reticulation valves, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT
7、agreement. This document was published in May 2009. This document supersedes SABS 1808-16:2001 (edition 1.1). A vertical line in the margin shows where the text has been technically modified by amendment No. 2. SANS 1808 consists of the following parts, under the general title Water supply and distr
8、ibution system components: Part 2: Metallic compression type pipe couplings. Part 5: Flexible connectors. Part 9: Metering taps and valves (metallic bodies). Part 10: Copper alloy check valves (spring-loaded). Part 13: Diaphragm valves. Part 15: Mechanical back-flow prevention devices. Part 16: Drin
9、king fountain taps. Part 18: PVC-U gate valves. Part 24: Gas-operated water heaters. Part 30: Laboratory water taps. Part 31: Automatic control valves. Part 32: Float valves (equilibrium type). Part 35: Electronically operated taps and valves. Part 37: Single-control mixer taps (plastics). SANS 1808
10、-13:2009 Edition 1.2 1 Foreword (concluded) Part 44: Pipe saddles. Part 45: Pipe repair clamps. Part 53: Drain cocks for hot-water storage containers. Part 58: In-line strainers. Part 66: Demand type water taps. Part 85: Oriented polyvinyl chloride (PVC-O) pressure pipes for underground use. Annexes
11、 A and B form an integral part of this document. Annex C is for information only. SANS 1808-13:2009 Edition 1.2 2 Contents Page Foreword 1 Scope . 3 2 Normative references . 3 3 Definitions 4 4 Valve pattern 5 5 Nominal size range 6 6 Nominal pressure 6 7 Pressure/temperature ratings 6 8 Dimensions
12、and tolerances of body ends . 6 9 Design and operation 7 10 Materials (type and quality) . 9 11 Methods of test . 11 12 Test certificate . 12 13 Marking 12 14 Preparation for storage and transportation . 13 Annex A (normative) Information to be supplied by the purchaser 14 Annex B (normative) Typica
13、l diaphragm valve constructions 15 Annex C (informative) Quality verification of diaphragm valves . 17 Bibliography 17 SANS 1808-13:2009 Edition 1.2 3 Water supply and distribution system components Part 13: Diaphragm valves 1 Scope 1.1 This part of SANS 1808 specifies requirements for the size, rat
14、ing, design, materials, marking, and preparation for the transportation and storage of diaphragm valves with nominal pressures of PN 6, PN 10 and PN 16 suitable for use in waterworks at temperatures of 5 C to +80 C. 1.2 It covers the requirements for valves suitable for use in industrial application
15、s at temperatures up to 220 C and for a variety of fluids. 1.3 It covers flanged valves of nominal size (DN) in the range DN 15 to DN 400 and valves with internal screwed threads suitable for screwed pipes of size up to and including 80 mm. 1.4 It does not cover the requirements for valves with butt
16、-welded ends. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of SANS 1808. All standards are subject to revision and, since any reference to a standard is deemed to be a reference to the latest edition of th
17、at standard, parties to agreements based on this part of SANS 1808 are encouraged to take steps to ensure the use of the most recent editions of the standards indicated below. Information on currently valid national and international standards can be obtained from the SABS Standards Division. BS 156
18、0-3-3.1, Circular flanges for pipes, valves and fittings (class designated) Part 3: Steel, cast iron and copper alloy flanges Section 3.1: Specification for steel flanges. Amdt 2 BS 1560-3-3.2, Circular flanges for pipes, valves and fittings (class designated) Part 3: Steel, cast iron and copper all
19、oy flanges Section 3.2: Specification for cast iron flanges. BS 1560-3-3.3, Circular flanges for pipes, valves and fittings (class designated) Part 3: Steel, cast iron and copper alloy flanges Section 3.3: Specification for copper alloy and composite flanges. Amdt 2 SANS 1808-13:2009 Edition 1.2 4 B
20、S 4504-3-3.1, Circular flanges for pipes, valves and fittings (PN designated) Part 3: Steel, cast iron and copper alloy flanges Section 3.1: Specification for steel flanges. Amdt 2 BS EN 1092-3, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part
21、 3: Copper alloy flanges. Amdt 2 BS EN 1561, Founding Grey cast irons. BS EN 1562, Founding Malleable cast irons. BS EN 1563, Founding Spheroidal graphite cast iron. BS EN 1564, Founding Austempered ductile cast irons. BS EN 1706, Aluminium and aluminium alloys Castings Chemical composition and mech
22、anical properties. Amdt 2 BS EN 10213, Steel castings for pressure purposes. Amdt 2 BS EN 10293, Steel castings for general engineering uses. Amdt 2 EN 1759-1, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, class designated Part 1: Steel flanges. Amdt 2 EN 198
23、2, Copper and copper alloys Ingots and castings. Amdt 2 EN 10250-4, Open die steel forgings for general engineering purposes Part 4: Stainless steels. Amdt 2 EN 12163, Copper and copper alloys Rod for general purposes. Amdt 2 EN 12164, Copper and copper alloys Rod for free machining purposes. Amdt 2
24、 EN 12167, Copper and copper alloys Profiles and rectangular bar for general purposes. Amdt 2 EN 12844, Zinc and zinc alloys Castings Specifications. Amdt 2 ISO 5211, Industrial valves Part-turn actuator attachment. Amdt 2 SANS 200, Copper alloy ingots and castings. SANS 936 (SABS 936), Spheroidal g
25、raphite iron castings. SANS 1034, Grey iron castings. SANS 1109-1/ISO 7-1, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation. SANS 1123, Pipe flanges. SABS 1700, Fasteners. Amdt 2 3 Definitions For the purposes of this part of SANS 1808,
26、the following definitions apply: 3.1 acceptable acceptable to the authority administering standard, or to the parties concluding the purchase contract, as relevant Amdt 2 SANS 1808-13:2009 Edition 1.2 5 3.2 end-to-end dimension the distance, expressed in millimetres, between the extremities of the b
27、ody end ports 3.3 face-to-face dimension the distance between the two planes perpendicular to the body axis located at the extremities of the body end ports. Where a lining extends over the end faces, the face-to-face dimension is exclusive of the lining thickness 3.4 lined body a body of which the
28、wetted surface and any other sealing areas necessary for the correct functioning of the valve have a lining of a corrosion-resistant or abrasive-resistant material 3.5 nominal pressure PN a numerical designation which is a convenient round number for reference purposes and represents the pressure th
29、at the fully closed valve can stand without leakage at the seat 3.6 nominal size DN a numerical designation of size which is common to all components in a piping system other than components designated by outside diameters or by thread size. It is a convenient round number for reference purposes and
30、 is only loosely related to manufacturing dimensions NOTE 1 Nominal size is designated by the letters DN followed by a number, for example DN 100. NOTE 2 This definition is identical with that in ISO 6708, published by the International Organization for Standardization (ISO). 3.7 required as specifi
31、ed, or when relevant, as agreed upon by the purchaser 3.8 sealed bonnet valve a valve that has a seal between the spindle and the bonnet neck to withstand line pressure or vacuum without leakage in the event of diaphragm failure 3.9 tight shut-off valve a valve that allows no visible leakage past th
32、e diaphragm in the closed position under test conditions 3.10 working pressure the line pressure against which the valve can be closed by manual means 4 Valve pattern The valve pattern shall be one of the following, as specified (see annex A): a) semi-weir pattern (see figure B.1); b) weir pattern (
33、see figure B.2); c) straight through pattern (see figure B.3). SANS 1808-13:2009 Edition 1.2 6 5 Nominal size range 5.1 Flanged body ends The nominal size of a valve (DN) with flanged body ends shall be one of the following, as specified (see annex A): DN 15, DN 20, DN 25, DN 32, DN 40, DN 50, DN 65
34、, DN 80, DN 100, DN 125, DN 150, DN 200, DN 250, DN 300, DN 350 and DN 400. 5.2 Screwed body ends The nominal size of a valve with screwed body ends shall be one of the following, as specified (see annex A): 8, 10, 15, 20, 25, 32, 40, 50, 65 and 80. NOTE For end-to-end dimensions of screwed body end
35、 valves, refer to the manufacturers catalogue. 6 Nominal pressure The nominal pressure of a valve shall be one of the following, as specified (see annex A): PN 6: For working pressures not exceeding 0,6 MPa; PN 10: For working pressures not exceeding 1,0 MPa; and PN 16: For working pressures not exc
36、eeding 1,6 MPa. 7 Pressure/temperature ratings 7.1 Waterworks application Valves shall be suitable for use in a temperature range of 5 C to +80 C at the maximum nominal pressure of the valve assembly. 7.2 Industrial application The body and bonnet of the valve shall be designed to withstand pressure
37、s in accordance with the pressure/temperature ratings for the respective materials as specified for flanges in the appropriate of BS EN 1092-3, and SANS 1123, as relevant. Amdt 2 NOTE In the case of lined bodies, the pressure/temperature rating might be restricted to the manufacturers recommendation
38、s. When the valve has a flange which has a different PN rating from that of the body, then the lower of the two shall be taken as the body pressure rating. 8 Dimensions and tolerances of body ends 8.1 Flanged body ends 8.1.1 Dimensions Flange dimensions shall comply, as appropriate, with the require
39、ments of one of the following standards, except that it is permissible for flanges to be undrilled (see note): SANS 1808-13:2009 Edition 1.2 7 a) SANS 1123 for pipe flanges; b) EN 1759-1 for steel; Amdt 2 c) BS 1560-3-3.2 for cast iron; d) BS EN 1092-3 for copper alloy; and Amdt 2 e) BS EN 1092-3 fo
40、r copper alloy. Amdt 2 NOTE Flanges will be supplied drilled unless undrilled flanges are specified by the purchaser (see item (e) of annex A). 8.1.2 Face-to-face dimensions Face-to-face dimensions shall be in accordance with table 1. 8.1.3 Tolerances on face-to-face dimensions Tolerances on face-to
41、-face dimensions shall be in accordance with table 1. 8.2 Threads for screwed body ends The threads of screwed body ends shall comply with the requirements of SANS 1109-1. 9 Design and operation 9.1 Design 9.1.1 Nominal pressure rating The design of the valve shall be such that when the valve is tes
42、ted in accordance with 11.1, the valve shall shut off tight (i.e. there shall be no leakage past the seat). SANS 1808-13:2009 Edition 1.2 8 Table 1 Face-to-face dimensions for flanged body end valves 1 2 3 Nominal size Face-to-face/end-to-end dimension Tolerance DN mm mm 15 108 20 117 25 127 35 146
43、40 159 50 190 1 65 216 80 254 100 305 125 356 2 150 406 200 521 3 250 635 300 749 350 749 400 749 4 NOTE See 3.3 for a definition of the face-to-face dimension of a lined valve. 9.1.2 Test pressure rating The design of the valve shall be such that when the valve is tested in accordance with 11.2, th
44、ere shall be no leakage past any seal in the body or through the material of the body. 9.1.3 Bodies End flanges of flanged steel valves shall be cast or forged integral with the body. 9.1.4 Bonnets If sealed bonnet valves are required (see item (f) of annex A), the bonnet shall have a seal between t
45、he spindle and the bonnet neck to withstand the test pressure or line vacuum without leakage. 9.1.5 Diaphragms The diaphragm shall be capable of being replaced. 9.1.6 Fasteners The type of fastener shall be as required by the manufacturer and shall comply with an acceptable standard. Amdt 2 SANS 180
46、8-13:2009 Edition 1.2 9 9.2 Operation 9.2.1 Operational capability It is permissible for valves to be designated for operating conditions that have the differential pressure across the diaphragm limited to values less than the nominal pressure rating. In these cases, the valve bonnet shall be marked
47、 with this limiting pressure (see 13.1). All valves shall be capable of being operated by one of the appropriate devices specified in 9.2.2 and 9.2.3. 9.2.2 Manual operation Handwheels, where fitted, shall be marked with the direction of closure. Handwheels shall be securely fitted yet allow for rem
48、oval and replacement when necessary. Unless otherwise specified, valves shall be designed for clockwise closing (see item (h) of annex A). 9.2.3 Actuator operation Where actuator operation is required and the actuator is not an integral part of the valve, the valve to actuator flange or the yoke dim
49、ensions shall comply with the requirements of ISO 5211. Amdt 2 NOTE The details of the actuator and its power supply together with the design maximum pressure differential across the valve should be specified by the purchaser (see item (i) of annex A). 9.2.4 Indicators Valves shall, if so specified, be provided with an indicator (see item (j) of annex A) to show the open and closed positions. 10 Materials (type and quality) The type of material for the different components of the valve shall be as identified
