Material, design and performance requirements for copper alloy globe and diaphragm valves for wet rising mains to BS Covers high and low pressure types. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents. Learn more about the cookies we use and how to change your settings.
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UDC Committees responsible for this British Standard. The following body was also represented in the drafting of the standard, through subcommittees and panels:. Page Committees responsible Inside front cover Foreword ii Section 1. General 1 Scope 1 2 Definitions 1 3 Valve types 1 4 Classification by pressure rating 1 5 Nominal inlet sizes 2 6 Temperature rating 2 7 Marking 2 Section 2. Production testing requirements and test certificate 25 Hydrostatic tests 7 26 Pressure control test high pressure valves only 7 27 Test certificate 7 Appendix A Test methods 8 Appendix B Recommendations for the information to be supplied by the purchaser to the manufacturer 9 Figure 1 — Valve types 1 Table 1 — Choice of materials for components and parts 4 Table 2 — Bolting for valves 5 Table 3 — Body test pressures and durations 8 Table 4 — Seat test pressures and durations 8 Publications referred to Inside back cover.
This revision of BS has been prepared under the direction of the Fire Standards Committee and supersedes BS , which is withdrawn.
It specifies requirements for valves suitable for use on wet risers of either high or low pressure installations. BS was restricted to copper alloy globe valves but in this revision requirements for diaphragm valves are included. The subjects of the other Parts in the BS series of general specifications for fire hydrant systems equipment are as follows. These Parts give detailed requirements for most of the other special items required for wet and dry risers described in BS In this standard metric values are given in SI units; for further information reference should be made to BS Some nominal bores and thread sizes are given in inches to accord with the standards referred to.
A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover and a back cover.
This standard has been updated see copyright date and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. The valves have screwed or flanged inlets and also delivery hose connections complying with BS NOTE 2 Information which the purchaser is recommended to supply to the manufacturer is given in Appendix B and does not form part of the specification. NOTE 3 The titles of the publications referred to in this standard are listed on the inside back cover.
Figure 1 — Valve types 4 Classification by pressure rating 4. Each valve shall be marked with the following: 5. The marking shall be visible on the assembled valve. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.
Each component or part of the valve shall be made from one of the materials given in Table 1. Table 6 of BS for PN 16 for the appropriate size of valve. The bonnet to body connection shall be bolted. The body seat shall be either integral with the body The bonnet to body connection shall be screwed or or inserted in the form of a securely fitted but union or bolted. The surfaces forming the bonnet renewable ring. The shape of the seating surface and body joint shall be machined.
They shall be formed in one piece, and shall be cast smooth and level or machined or spot shall be of sufficient length to ensure a minimum faced to ensure satisfactory bolting. Table 1 — Choice of materials for components and parts Component Material British Standard Grade or designation number.
Metric Inch The size of any square or drive on the stem shall be not less than 12 mm across flats. BS The root diameter of the thread shall be not less than the following: BS requires connectors including completely through the gland nut. The test method in A. Globe valves shall be provided with one of the The valve shall be provided with a means for It shall be possible to replace the seal or repack the attaching a strap, so that the handwheel can be gland when under pressure with the valve fully secured to counter unauthorized use.
NOTE If specified by the purchaser the following should also be provided see BS : 15 Glands on globe valves a a strap made of leather or reinforced plastics material not Glands on globe valves shall be either screwed or less than 12 mm wide or less than 2 mm thick, and with ends suitable for linking by a padlock; bolted Screwed glands shall consist of a gland and b a small non-ferrous padlock to secure the two ends of the gland nut when used as a stuffing box.
Bolted glands strap. The cap shall be provided with a pressure relief hole having a flow area of not less than 2 mm2. The valve shall be closed by turning the handwheel in a clockwise direction when facing the handwheel. The requirements in The direction. The valve when measured in accordance with A. The water flow rate through the valve shall be not less than 8.
Section 3. Production testing requirements and test certificate 25 Hydrostatic tests 27 Test certificate It shall also state the medium Each valve shall be tested in accordance with A. Appendix A Test methods A.
Where hydrostatic pressure testing is A. Render any downstream of the pressure measuring devices; pressure relief valve inoperative. With the valve in c a means of supplying water at both a suitable the open or partly open position, connect the inlet to pressure and 8. Vent any trapped air. Apply the test A. Use Mount the landing valve in the test rig fully opened.
With water flowing through the rig adjust the NOTE The test may be carried out before the connector is fitted control valves to give a flow rate of 8.
When testing high inlet pressure at the landing valve of 4. If pressure valves with integral connectors, or with screwed-on necessary, successively adjust the two control connectors fitted, additional means of retaining the outlet blanking piece may be used to prevent distortion of the release valves: opening the upstream valve will increase mechanism.
When testing low pressure valves with the connector pressure and flow while opening the downstream fitted additional means may not be used to retain the outlet valve will decrease pressure and increase flow. Measure and record the outlet pressure. Table 3 — Body test pressures and durations A. A test rig in accordance with A. High pressure 30 2 A. Render any pressure relief valve inoperative. With the outlet open to the atmosphere and the valve in the closed position, b With water flowing through the rig and at an inlet pressure of approximately 7.
Measure and record the water accordance with Table 4. Apply the test pressure flow rate and inlet and outlet pressures.
Table 4 — Seat test pressures and durations c Open the upstream control valve to increase the inlet pressure to approximately Do Valve type Minimum hydrostatic Test duration not adjust the downstream control valve unless test pressure the outlet pressure is outside the limits bar min of 4.
In that case adjust only the downstream valve and by small increments only High pressure 22 2 until the flow rate of pressure falls within the limits. Measure and record the flow rate and pressures. Adjust valve inlet, to provide a water supply at a pressure the downstream control valve only if necessary, equal to the nominal inlet pressure of 15 bar as above.
Measure and record the flow rate and low pressure valves or 20 bar high pressure inlet pressures. This pipework as low an inlet pressure as is possible without the shall be self-draining. Adjust the see clauses 23 and 26 water pressure to the value equal to the nominal A. Apparatus in accordance inlet pressure of the valve under test. Heat the oven with A. Measure the rate of any water flow from the valve at the end Since valves with a pressure regulating device do of this time.
Mount the landing valve in the test rig fully opened. Observe e if a flanged inlet is required, whether the and record whether the outlet pressure remains flange is to be supplied undrilled see Repeat the test at inlet pressures of 10 bar and 15 bar. With water flowing through the valve, adjust the control valves to give a water flow rate of 8.
Slowly close the downstream control valve. Observe and record the outlet pressure at which the pressure relief valve opens. BS 21, Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads metric dimensions. BS , Specification for fire hose couplings and ancillary equipment. BS , Method for Vickers hardness test.
BS , Testing of metals. BS , Wrought steels blooms, billets, bars and forgings. BS , Carbon and alloy spring steels for the manufacture of hot formed springs. BS , Specification for natural rubber compounds. BS , Specification for copper alloy ingots and copper alloy and high conductivity copper alloy castings. BS , Specification for grey iron castings.
BS , Aluminium and aluminium alloy ingots and castings. BS , Specification for carbon, low alloy and stainless steel bars and billets for bolting material to be used in pressure retaining applications.
Latest version of document. Material, design and performance requirements for copper alloy globe and diaphragm valves for wet rising mains to BS Covers high and low pressure types. Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards. Website: www.
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