1、BRITISH STANDARD BS 5163-2:2004 Valves for waterworks purposes Part 2: Stem caps for use on isolating valves and associated water control apparatus Specification ICS 23.060.30 BS 5163-2:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 23
2、December 2004 BSI 23 December 2004 First published October 1974 First revision October 1986 First published as Part 2 December 2004 The following BSI references relate to the work on this British Standard: Committee reference PSE/7/3 Draft for comment 04/30111467 DC ISBN 0 580 44712 X Committees res
3、ponsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee PSE/7, Industrial valves, to Subcommittee PSE/7/3, Cast iron isolating, check and hydrant valves for industrial use and valves for water industry applications, upon which the following bo
4、dies were represented: British Chemical Engineering Contractors Association BVAA British Valve and Actuator Association CMF Cast Metals Federation Ductile Iron Producers Association Energy Industries Council Institution of Mechanical Engineers Pipeline Industries Guild Society of British Water Indus
5、tries Water UK Amendments issued since publication Amd. No. Date CommentsBS 5163-2:2004 BSI 23 December 2004 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3T e r m s a n d d e f i n i t i o n s 1 4 Design requirements 3 5 Preparing for st
6、orage and transport 4 Annex A (normative) Test method for the resistance of stem caps to operating loads 5 Bibliography 7 Figure 1 Ring key and bar 2 Figure 2 T key 3 Figure 3 Typical stem cap 4 Table 1 Dimensions of stem caps 3BS 5163-2:2004 ii BSI 23 December 2004 Foreword This part of BS 5163 has
7、 been prepared under the direction of Technical Committee PSE/7 to facilitate the application of BS EN 1074-1:2000, BS EN 1074-2:2000 and BS EN 1074-6:2004. Along with BS 5163-1:2004, BS EN 1074-1:2000 and BS EN 1074-2:2000, this standard supersedes BS 5163:1986, which is withdrawn. This standard gi
8、ves details of stem caps not covered in BS EN 1074-1:2000, BS EN 1074-2:2000 or BS EN 1074-6:2004. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer
9、immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 5163-2:2004 BSI 23 December 2004 1 1 Scope
10、 Isolating valves and hydrants installed in underground pipelines primarily carrying water intended for human consumption within the United Kingdom are required to be fitted with a stem cap to enable them to be operated by a ring-key and bar or T-shaped key. The stem cap is fitted to the top of the
11、valve stem to convert the manufacturers stem configuration to mate with operating keys. Two sizes of stem cap are specified, covering respectively, valves from DN 50 through DN 300 and DN 350 through DN 600. NOTE Stem caps are also commonly used on other waterworks apparatus, e.g. penstocks (specifi
12、ed in BS 7775). 2 Normative references The following referenced documents are indispensable for the application 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. BS 6615:19
13、96/ISO 8062:1994, Specification for dimensional tolerances for metal and metal alloy castings. BS EN 1074-1, Valves for water supply Fitness for purpose requirements and appropriate verification tests Part 1: General requirements. BS EN 1074-2, Valves for water supply Fitness for purpose requirement
14、s and appropriate verification tests Part 2: Isolating valves. BS EN 1074-6, Valves for water supply Fitness for purpose requirements and appropriate verification tests Part 6: Hydrants. BS EN 1503-3, Valves Materials for bodies, bonnets and covers Part 3: Cast irons specified in European Standards.
15、 3 Terms and definitions For the purposes of this part of BS 5163, the following terms and definitions apply. 3.1 stem cap device to enable valves of different sizes and stem configurations to be operated by standard operating keys NOTE 1 A stem cap is an operating element. See also BS EN 736-2. NOT
16、E 2 The socket end of operating keys should be dimensionally in accordance with BS 336 for valves up to DN 300. 3.2 ring key and bar operating key with a socket at its lower end, which engages with the stem cap on the valve or hydrant, and a ring at the upper end to enable a bar to be inserted, whic
17、h can then be used manually to turn the valve stem NOTE A ring key and bar is illustrated in Figure 1. 3.3 T key operating key similar to a ring key and bar but having a fixed short-length upper bar attached centrally at right angles to the shaft NOTE A T key is illustrated in Figure 2.BS 5163-2:200
18、4 2 BSI 23 December 2004 3.4 mST minimum strength torque as specified in BS EN 1074-1, BS EN 1074-2 and BS EN 1074-6 NOTE This sketch is diagrammatic only. Figure 1 Ring key and barBS 5163-2:2004 BSI 23 December 2004 3 4 Design requirements 4.1 Materials 4.1.1 Stem cap materials shall be selected fr
19、om those listed in BS EN 1503-3. 4.1.2 Cast iron components shall be fully coated to provide protection against corrosion. 4.1.3 Components used to secure stem caps to valve stems shall be resistant to corrosion and ageing by the selection of materials, or shall be protected by appropriate means. 4.
20、2 Dimensions 4.2.1 Stem caps shall comply with the dimensions given in Table 1 and Figure 3. They shall be securely attached to the valve stem and be designed in such a manner that they can be removed when required. The method of attachment to the valve stem shall not interfere with the location of
21、the operating key. Table 1 Dimensions of stem caps (see Figure 3) NOTE This sketch is diagrammatic only. Figure 2 T key Nominal size Length of cap square, A Square of cap, B DN mm mm 50, 65, 80, 100, 125, 150, 200, 250, 300 63 35 350, 400, 450, 500, 600 75 48 Dimensions A and B shall have casting to
22、lerance ISO 8062-CT10 (BS 6615:1996/ISO 8062:1994). NOTE For sizes above DN 600, if a stem cap is required, dimensions should be agreed between purchaser and manufacturer.BS 5163-2:2004 4 BSI 23 December 2004 4.2.2 The design of the lower end internal parts of the stem caps is the responsibility of
23、the valve manufacturer, who shall ensure they can be secured to their design of stems and removed as required. The design shown in Figure 3 is typical only. 4.3 Resistance of stem caps to operating loads Stem caps in their delivery condition shall withstand, without failure, an operating torque of 0
24、.8 times the mST. Failure is defined as the inability of the stem cap to resist the load for the duration of the test. Testing shall be in accordance with Annex A. 5 Preparing for storage and transport Stem caps can be supplied loose for use as spares, however, when supplied fitted to valves, they s
25、hall be securely fastened to the valve stem. NOTE Care is required in handling valves on which a stem cap is fitted. In particular, valves should not be lifted by the stem cap to avoid the possibility of the valve and stem cap separating, causing both a health and safety risk and the possibility of
26、damage to the valve. Key 1 Taper 1 in 20 on each side A Length of cap square (see Table 1) B Square of cap (see Table 1) Figure 3 Typical stem cap A B 1BS 5163-2:2004 BSI 23 December 2004 5 Annex A (normative) Test method for the resistance of stem caps to operating loads A.1 General The test shall
27、be performed at ambient temperature with a stem cap in its delivery condition. A.2 Test procedure Attach and secure the stem cap on a rigidly mounted spigot having the same form and dimensions as the mating section of the valve stem. Apply a torque load as specified in 4.3 for a minimum of 15 s. NOT
28、E The socket used to apply the load should be dimensionally in accordance with BS 336 up to DN 300.6 blankBS 5163-2:2004 BSI 23 December 2004 7 Bibliography BS 336, Specification for fire hose couplings and ancillary equipment. BS 7775, Specification for penstocks. BS EN 736-2, Valves Terminology Pa
29、rt 2: Definition of components of valves.BS 5163-2:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is in
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