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1、JIS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Pressure reducing valves for water works ICs 23.060.40; 91.140.65 Reference number : JIS B 8410 : 2004 (E) PROTECTED BY COPYRIGHT 9s B 8410 : 2004 Foreword This translation has been made based on L e origina
2、Japanese Industrial Standard revised by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial Standard submitted by Japan Heating Industrial Association (HA) with the draft being
3、 attached, based on the provision of Article 12 Clause 1 of the Industrial Standard- ization Law applicable to the case of revision by the provision of Article 14. Consequently JIS B 8410 : 1999 is replaced with this Standard. Date of Establishment: 1979-10-01 Date of Revision: 2004-03-20 Date of Pu
4、blic Notice in Official Gazette: 2004-03-22 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Industrial Machinery JIS B 8410 : 2004, First English edition published in 2004-05 Translated and published by: Japanese Standards Association 4-1 -24, Akasaka,
5、 Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mech
6、anical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT -,-,- B 8410 : 2004 Contents Page Introduction . 1 2 3 4 5 6 6.1 6.2 6.3 6.4 7 8 9 10 Scope Normative references Definitions Classification and symbols Performance
7、Construction . General Pressure regulating mechanism . Back current prevention device Cold district adaptation device . Shape and dimensions . Appearance . Materials . Test methods 10.1 Apparatus 10.2 Set pressure test 10.3 Open flow rate test . 10.4 Pressure characteristic test . 10.5 Back current
8、prevention test . 10.6 Pressure resistance test . 10.7 Low temperature resistance test 10.8 Durability test 10.9 Leaching test 11 Inspection method . 11.2 Delivery inspection 11. i Type inspection (i) PROTECTED BY COPYRIGHT 1 1 1 2 2 3 4 4 4 4 4 4 5 5 5 5 6 6 6 6 7 7 8 8 9 9 9 -,-,- B 8410 : 2004 12
9、 Packing 9 13 Designation . 9 14 Marking . 9 15 Precautions of handling . 10 (ii) PROTECTED BY COPYRIGHT -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 8410 : 2004 Pressure reducing valves for water works Introduction This Japanese Industrial Standard has been established in 1979 as JIS B 8410 for the pur
10、pose of ensuring safety and reliability of pressure reducing valves for water works intended for use in water feeding of boilers for hot-water supply or for space heating purposes (hereafter referred to as “hot water heat exchanger”) which does not conform to the provisions of the Ordinance on Safet
11、y of Boilers and Pressure vessels (Ministerial Ordinance No. 33 of the Ministry of Labour, 1972) based on the Industrial Safety and Health Law (Law No. 57, 1972). This revision, based on the Ministerial Ordinance which partially amends the Or- dinance concerning Standards for Structure and Material
12、of Water Supply Systems (Ordinance No. 6 of the Ministry of Health, Labour and Welfare, issued on Jan. 26, 2004, enforced on Apr. 1, 20041, conforms this Standard to the regulation for effect to water quality, which has been modified in the Ordinance. 1 This Standard specifies pressure reducing valv
13、es for water works with built-in back current prevention mechanism and with a maximum valve-inlet work- ing pressure not exceeding 750 kPa to be used mainly in water feeding of hot water heat exchanger (hereafter referred to as “pressure reducing valves”). Scope Remarks : In this Standard, all the p
14、ressures refer to gauge pressure. 2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied. JIS B 0203 Taper p
15、ipe threads JIS B 7505 Bourdon tube pressure gauges JIS B 8414 Relief valves for hot water appliances JIS H 3300 Copper and copper alloy seamless pipes and tubes JIS H 3320 Copper and copper alloy welded pipes and tubes JIS S 3200-1 Equipment for water supply service-lest methods of hydrostatic pres
16、sure JIS S 3200-2 Equipment for water supply service-Test method of low tempera- ture resistant JIS S 3200-4 Equipment for water supply service-Test method of prevention from back current JIS S 3200-6 Equipment for water supply service-Test methods of durability JIS S 3200-7 Equipment for water supp
17、ly service-Test methods of effect to toa- ter quality PROTECTED BY COPYRIGHT -,-,- 2 B 8410 : 2004 3 Definitions 65 80 valve-inlet pressure Pressure acting to valve body at the inlet or to a piping internal close to the valve body inlet side. valve-outlet pressure Pressure acting to valve body at th
18、e outlet, or to a piping internal close to the valve body outlet side. set pressure The valve-outlet pressure when it is closed while applying a specific pressure to the valve inlet. open flow rate The flow rate when valve-inlet pressure is kept at a specified level while releasing the valve outlet.
19、 pressure characteristic Valve-outlet pressure relating to fluctuation of the valve-inlet pressure when closing the valve outlet. general use Those equipped with no draining device to prevent such occur- rence as fracture by freezing. cold district use Those equipped with draining device to prevent
20、fracture of freezing and the like. 65 100 80 4 Classification and symbols Pressure reducing valves shall be classified and symbolized according to the set pressure, nominal bore size and use, as follows. 120 150 170 a) Division by set pressures Table 1 gives the division by the set pressure. 120 200
21、 150 170 Table 1 Division by set pressures Unit : kPa Pressure reducing valve (symbol) 65 I Symbol Set pressure Maximum working pressure of hot water heat exchanger Relief valve for hot water appliances (symbol) 95, 97 85 85 80 85 97 190 170 PROTECTED BY COPYRIGHT -,-,- 3 B 8410 : 2004 20 25 b) Divi
22、sion by nominal bore sizes Table 2 gives the division by the nominal bore size. 20 25 Table 2 Division by nominal bore sizes Unit: mm Item Tolerance on set pressure Open flow rate Symbol I Nominal bore size I I Performance Test method Symbol 65,80,85 rt6 Wa 10.2 120,150, 170 r+7 kPa Nominal bore siz
23、e 15 15 Umin min. 10.3 Nominal bore size 20 Nominal bore size 25 30 Umin min. 50 Umin min. 15 Back current prevention Pressure resistance Low temperature resistance 15 Not to cause leakage. 10.5 To be free from deformation and leakage outward. 10.6 To be within the set pressure tolerance after water
24、 re-flowing. 10.7 Remarks : For the copper pipe connecting part of the valves to be integrated into a hot water heat exchanger, the nominal size or preferred size of JIS H 3300 or JIS H 3320 may apply. c) Division by use Table 3 gives the division by the use. Table 3 Division by use Symbol 5 Perform
25、ance The performance of pressure reducing valves, when tested by the methods in clause 10, shall meet the requirements given in table 4. Table 4 Performance Pressure characteristic I To be within the tolerance on set pressure. I 10.4 Durability I To meet all the above items after operations of lo5 t
26、imes. I 10.8 Effect to water quality I To meet the criteria given in attached table 1. I 10.9 PROTECTED BY COPYRIGHT -,-,- 4 B 8410 : 2004 6 Construction 6.1 Pressure reducing valves shall be constructed as shown in figure 1, function securely, have pressure resistance and durability and shall not c
27、ause frac- ture, deformation or leakage easily. General Adjusting screw Valve shell Adjusting spring Valve element Diaphragm Check valve Figure 1 Structural drawing of pressure reducing valves for water works (example) 6.2 Pressure regulating mechanism The pressure regulating mechanism, which consis
28、ts of adjusting spring, diaphragm, valve element, etc., shall be capable of keeping the valve-outlet pressure stable even if the valve-inlet pressure has fluctuated. The adjusting screw shall be sealed by means of labelling, fix-painting and the like to prevent easy access to pressure regulation. 6.
29、3 Back current prevention device The back current prevention device shall be capable of checking the back current securely when the valve-inlet pressure low- ered below the valve-outlet pressure. 6.4 Cold district adaptation device The cold district adaptation device shall be constructed so that it
30、will not fracture or check re-flowing when the residual wa- ter in the valve has frozen after completion of draining operation. Where a draining tap is equipped, simple draining shall be possible without ne- cessitating use of any tool. 7 Shape and dimensions The shape of fitting and the mounting di
31、mensions shall be as follows: PROTECTED BY COPYRIGHT 5 B 8410 : 2004 Symbol 15 20 25 a b) 8 Face-to-face dimension mm Nominal thread size 80, 90, 105, 115 Rc 112 90, 115 Rc 314 110, 150 Rc 1 Shape of fitting The fitting shall be shaped so that tools can be applied eas- ily for mounting/dismounting o
32、f the valve. Mounting dimensions Table 5 shows the mounting dimensions for the case of using taper pipe threads. Those intended to be built into a hot water heat exchanger, where using other fitting than taper pipe thread, need not comply with table 5. For the purpose of this table, the face-to-face
33、 dimension refers to that given in figure 2, Table 5 Mounting dimensions Remarks: The screw threads shall be internal taper pipe threads of JIS B 0203. Face-to-face dimension 4 Figure 2 Face-to-face dimension Appearance As to the appearance, pressure reducing valves shall be well-finished, free :rim
34、 such detrimental defects as flaws, rust and burrs. rust proofing. Materials used which may rust as detrimental to use shall be treated with a suitable 9 Materials The materials of a pressure reducing valve shall have sufficient strength to bear ordinary use and installation, and those to be used fo
35、r the part being in contact with water shall meet the requirements in 10.9. 10 Test methods 10.1 Apparatus The test apparatus shall be as follows: PROTECTED BY COPYRIGHT -,-,- 6 B 8410 : 2004 source (water) a) The pressure gauge used shall be that specified in JIS B 7505. Inlet side Outlet side b) T
36、he nominal diameter of the piping shall correspond to the nominal bore size of the specimen valve. 10.2 Set pressure test The set pressure test shall be carried out by using an apparatus shown in figure 3. With the outlet side of specimen valve closed, after applying a pressure of 350 kPa from the i
37、nlet side for a duration of 1 min, examine the valve-outlet pressure. I Sucking device Q Specimen valve I Outlet side stop valve Figure 3 An example of test apparatus for set pressure and pressure characteristic 10.3 Open flow rate test The open flow rate shall be tested by using an appara- tus show
38、n in figure 4 . Keeping the valve-inlet pressure at 100 kPa, release the out- let side to determine the flow rate by using a vessel. Where there may be no doubt, use of a calibrated flow meter is permissible for the determination. 1 Pressure I Specimen valve 9- valve L r Vessel Figure 4 An example o
39、f open flow rate testing apparatus 10.4 Pressure characteristic test The pressure characteristic test shall be made by using the test apparatus shown in figure 3. With the specimen valve closed in the outlet side, determine the valve-outlet pressure when changing the valve-inlet pressure gradually f
40、rom 200 kPa up to 750 kPa. 10.5 Back current prevention test The back current prevention test shall be made either according to JIS Z 3200-4 or by the following procedure: By using an apparatus shown in Figure 5, with the specimen valve installed in the mounting state designated, apply a pressure of
41、 3 kPa and the set pressure for relevant pressure re- ducing valve from the outlet side for a duration of 1 min to examine the presence of leakage toward the inlet side. PROTECTED BY COPYRIGHT -,-,- 7 B 8410 : 2004 I Figure 5 An example of back current test apparatus 10.6 Pressure resistance test Th
42、e pressure resistance test shall be made either in accordance with JIS S 3200-1, or by the following: Using an apparatus shown in figure 3, with the outlet side of the specimen valve closed, apply a water pressure of 1.75 kPa from inlet side for a duration of 1 min to examine, under keeping that sta
43、te, the presence of deformation and leakage outward. 10.7 Low temperature resistance test The low temperature resistance test shall be made in accordance either with the following procedure by using the apparatus shown in figure 6, or with JIS S 3200-2. Setting the specimen valve in the designated s
44、tate of horizontal piping, vertical piping or the like, flow water. Stop the flow to allow to stand for 10 min under the drained condition. Lowering the apparatus internal temperature from plus side gradually, after keeping at -20 “C f 2 “C for 1 h, re-flow water. After the re-flowing, which shall b
45、e made from inlet side at the normal tem- perature and 200 kPa in pressure, examine the valve-outlet pressure. The out- let side may either be released or circulated. PROTECTED BY COPYRIGHT -,-,- 8 B 8410 : 2004 Unit: mm For setting in horizontal piping For setting in vertical piping A 500 500 c; 50
46、0 : specimen valve, O : joining outlet. Figure 6 An example of low temperature test apparatus Remarks : The horizontal part of piping shall rise ahead with a gradi- ent not less than 1/100. 10.8 Durability test The durability test shall be made either in accordance with JIS S 3200-6 or according to
47、the following: With the valve set in an apparatus as shown in figure 7, apply a water pressure of 350 kPa from the valve inlet side. After repeating opedclose operation to the valve at a rate of 4 cpm to 15 cpm for 105 cycles by means of solenoid valve and the like, examine the performance defined i
48、n clause 5. The operation of one opening and closing are to be counted as one cycle. Specimen valve Solenoid n valve Figure 7 An example of durability test apparatus 10.9 Leaching test according to JIS S 3200-7. of attached table 1. The leaching test of pressure reducing valves shall be made For identification of the material of water contact part to be tested, see note (1) PROTECTED BY COPYRIGHT 9 B 8410 : 2004 11 Inspection method 11.1 the following items. eral use. Type inspection Typ