BS 7478-1991 Guide to selection and use of thermostatic radiator valves《恒温散热器阀的选择和使用指南》.pdf
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1、BRITISH STANDARD BS 7478:1991 Guide to Selection and use of thermostatic radiator valvesBS7478:1991 This British Standard, having been prepared under the directionof the Refrigeration, Heating and Air Conditioning Standards Policy Committee, waspublished under the authorityof the Standards Boardand
2、comes into effecton 20December1991 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference RHE/16 Draft for comment 89/80536 DC ISBN 0 580 19988 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the
3、Refrigeration, Heating and Air Conditioning Standards Policy Committee (RHE/-) to Technical Committee RHE/16, upon which the following bodies were represented: Association of Manufacturers of Domestic Unvented Supply Systems Equipment (MODUSSE) BEAMA Ltd. Association of Control Manufacturers (TACMA)
4、 British Gas plc British Plumbing Fittings Manufacturers Association British Valve and Actuator Manufacturers Association Building Services Research and Information Association Department of the Environment (Property Services Agency) Hevac Association Institute of Domestic Heating Engineers Institut
5、e of Refrigeration Institution of Gas Engineers Society of British Gas Industries Amendments issued since publication Amd. No. Date CommentsBS7478:1991 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii Section 1. General 1 Scope 1 2 Definitions and symbols 1 Section 2
6、. Domestic installations 3 General 3 4 Features 3 5 Valve selection 4 6 Checklist 6 7 Installation 6 8 Commissioning 7 9 User instructions 7 Section 3. Commercial installations 10 General 9 11 Valve selection 10 12 Features 10 13 Checklist 10 14 Installation 10 15 Commissioning 12 Figure 1 Typical f
7、low characteristics showing the two degree position 2 Figure 2 Typical two-pipe system installation 3 Figure 3 Principal components of thermostatic radiator valve 4 Figure 4 Valve position with respect to the radiator 5 Figure 5 Examples of radiator valve connections 6 Figure 6 Integral and remote s
8、ensor 7 Figure 7 Pipework configurations 9 Figure 8 Typical manufacturers flow capacity charts for two degree deviation 11 Figure 9 Sub-circuit pressure losses 12 Figure 10 Sub-circuit pressure losses 12 Publication(s) referred to Inside back coverBS7478:1991 ii BSI 08-1999 Foreword This guide has b
9、een prepared under the direction of the Refrigeration, Heating and Air Conditioning Standards Policy Committee to provide guidance to the user and installer of heating systems on thermostatic radiator valves. These temperature sensing valves are installed in place of manually operated radiator valve
10、s, enabling individual rooms to be controlled at different temperatures. Additionally thermostatic radiator valves (TRV) automatically compensate for heat gains from other sources, such as cooking, open fires, solar gain, additional occupancy, etc. Each TRV has its own temperature sensing actuator,
11、which enables the valve to admit more or less hot water to the radiator as the room temperature falls or rises, thereby maintaining comfort conditions and economizing on fuel. Since TRVs are entirely automatic, no manual adjustment is needed once the desired temperatures have been set. To obtain the
12、se benefits it is important that the guidelines given in this standard are adhered 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 i
13、tself 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 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will b
14、e indicated in the amendment table on the inside front cover.BS7478:1991 BSI 08-1999 1 Section 1. General 1 Scope This British Standard gives guidance on the selection, application and use of thermostatic radiator valves (TRV) manufactured in accordance with BSEN215-1for use in domestic and commerci
15、al wet central heating systems up to a water temperature of120 C. This standard covers two areas of TRV use, these are domestic installation and commercial installation. It is assumed that the installations to which the TRV is to be added are installed in accordance with BS5449, for domestic heating
16、 systems and in accordance with BS6880and CIBSE Commissioning Code Series W “Water distribution systems” for commercial installations. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions and symbols 2.1 Definitions For the purposes of th
17、is British Standard the following definitions apply. 2.1.1 two degree deviation the temperature change in kelvins which, from the closed position, results in60% of maximum flow rate through the TRV NOTE 1A TRV generally moves from a closed to a fully open position for a temperature change of6K. This
18、 magnitude of temperature change would obviously be unsuitable for controlling space temperature. For this reason a smaller deviation is normally chosen, typically2K. NOTE 2It can be seen from the graph inFigure 1 that more than60% of the maximum flow through the valve occurs with a temperature chan
19、ge of2K from the closed position. This valve characteristic has been found to give the optimum control. 2.1.2 maximum K I(K Is ) a means of identifying the maximum capacity of a TRV in the fully open position, in terms of flow (m 3 /h) at a differential pressure of1bar 1) NOTEThis enables the capaci
20、ty of one valve to be compared with another. This position is normally reached for a temperature change of 6 K. 2.1.3 differential pressure (p) the difference in pressure between the valve inlet and the valve outlet 2.1.4 static pressure the pressure existing in a central heating system when no wate
21、r is flowing 2.1.5 maximum working pressure the sum of the static and the differential pressures 2.1.6 valve authority (N) the ratio between the pressure loss across the valve when in the two degree position and the total pressure loss in the circuit NOTEThe ratio is used to determine the suitabilit
22、y of a valve for a particular purpose. Typical ratios for TRVs lie between0.3and0.5. 2.2 Symbols For the purposes of this British Standard the following symbols apply: 1) 1 bar = 10 5N/m 2= 100 kPa. a) two-port thermostatic radiator valve (straight pattern) b) two-port thermostatic radiator valve (a
23、ngle pattern) c) four-port thermostatic radiator valve d) isolation valve e) lockshield regulating valve (angle pattern) f) lockshield regulating valve (straight pattern) g) double regulation valve (regulation and isolation with adjustable regulation stop) h) isolation valve with calibrated orifice
24、and pressure tappings for flow measurements i) two-port motorized valve j) circulation pumpBS7478:1991 2 BSI 08-1999 k) radiator l) direction of flow Figure 1 Typical flow characteristics showing the two degree positionBS7478:1991 BSI 08-1999 3 Section 2. Domestic installations 3 General Figure 2 sh
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