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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.DateComments BS 5163-2:2004 BSI 23 December 2004 i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Terms and definitions1 4Design requirements3 5Preparing for storage and transport4 Annex A (
6、normative) Test method for the resistance of stem caps to operating loads5 Bibliography7 Figure 1 Ring key and bar2 Figure 2 T key3 Figure 3 Typical stem cap4 Table 1 Dimensions of stem caps3 BS 5163-2:2004 ii BSI 23 December 2004 Foreword This part of BS 5163 has been prepared under the direction o
7、f 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 Along with BS 5163-1:2004, BS EN 1074-1:2000 and BS EN 1074-2:2000, this standard supersedes BS 5163:1986, which is withdrawn.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 gives details of stem caps not covered
8、 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 immunity from legal obligations. Sum
9、mary 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 Isolating valves and hydrants inst
10、alled 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 valve stem to convert the manufactu
11、rers 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. NOTEStem caps are also commonly used on other waterworks apparatus, e.g. penstocks (specified in BS 7775). 2 Normative referenc
12、es 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 6615:1996/ISO 8062:1994, Specification for
13、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 requirements and appropriate verification tests
14、 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. 3 Terms and definitions For the pur
15、poses 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 1A stem cap is an operating element. See also BS EN 736-2. NOTE 2The socket end of operating keys s
16、hould 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, which can then be used manually to turn th
17、e valve stem NOTEA 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 NOTEA T key is illustrated in Figure 2. BS 5163-2:2004 2 BSI 23 December 2004 3.4 mST minimu
18、m strength torque as specified in BS EN 1074-1, BS EN 1074-2 and BS EN 1074-6 NOTEThis sketch is diagrammatic only. Figure 1 Ring key and bar BS 5163-2:2004 BSI 23 December 2004 3 4 Design requirements 4.1 Materials 4.1.1 Stem cap materials shall be selected from those listed in BS EN 1503-3. 4.1.2
19、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. 4.2 Dimensions 4.2.1 Stem caps shall comp
20、ly 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 the operating key. Table 1 Dimensions o
21、f stem caps (see Figure 3) NOTEThis sketch is diagrammatic only. Figure 2 T key Nominal sizeLength of cap square, ASquare of cap, B DNmmmm 50, 65, 80, 100, 125, 150, 200, 250, 3006335 350, 400, 450, 500, 6007548 Dimensions A and B shall have casting tolerance ISO 8062-CT10 (BS 6615:1996/ISO 8062:199
22、4). NOTEFor 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 the valve manufacturer, who shall ensure they ca
23、n 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 0.8 times the mST. Failure is defined as the inab
24、ility 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 shall be securely fastened to the valve stem. NOT
25、ECare 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 damage to the valve. Key 1Taper 1 in 20 on each s
26、ide ALength of cap square (see Table 1) BSquare of cap (see Table 1) Figure 3 Typical stem cap BS 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 be performed at ambient temperature with a stem cap in it
27、s 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. NOTEThe socket used to apply the load should be dimensionall
28、y in accordance with BS 336 up to DN 300. 6 blank BS 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 Part 2: Definition of components of valves. BS 5163-2:2004
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