《JIS-B-2003-1994-ENG.pdf》由会员分享，可在线阅读，更多相关《JIS-B-2003-1994-ENG.pdf（10页珍藏版）》请在三一文库上搜索。
1、J I S BX2003 9Ll 4933b08 0524b05 OOb = UDC 621.646.2.001.4 + JIS JAPANESE INDUSTRIAL STANDARD General rules for inspection of valves r . Translated and Published by Japanese Standards Association Printed in Japan 6s J I S BX2003 94 4733608 0524bOb T42 In the event of any doubt arising, the original
2、Standard in Japanese is to be final authority. -,-,- J I S B*K2003 94 4933608 0524607 989 UDC 621.646.2.001.4 JAPANESE INDUSTRIAL STANDARD J I S General rules for inspection of valves B 2003-1994 1 . inspection of valves specified in JIS B (Mechanical Engineering) Division. pressure for general use.
3、 Scope This Japanese Industrial Standard specifies the general rules for c The rules are also applicable to other valves of 63 K or under in nominal Remarks 1 . c 2. 3. 4. 2 . Definitions 0100 apply. The standards cited in this Standard are given in the following: JIS B O100 Glossary of terms for va
4、lves JIS B 0253 Gauges for taper pipe threads JIS B 2001 Nominal size and bore of valves JIS B 2002 Face-to-face and end-to-end dimensions of valves JIS B 2004 General rules for marking on valves JIS B 2203 Tolerances for pipe flanges The International standard corresponding to this Standard is give
5、n in the following: IS0 5208-1982 Industrial valves-Pressure testing for valves The units and numerical values given in in this Standard are in accordance with the traditional units, and are appended for informative reference. The nominal size given in ( ) in this Standard are of nominal size series
6、 B. For the purposes of this Standard, the definitions given in JIS B 3. following: Inspection items The inspection items of the valves shall be as given in the Structural inspection Dimensional inspection Visual inspection Material inspection Pressure inspections (a) Shell test (b) Seat leakage tes
7、t (c) Back seat leakage test Other inspections Remarks: The inspections on individual valves shall be specified selecting necessary inspection items from the items mentioned below for respective standards. -,-,- JIS B*2003 94 m 4933608 0524608 815 m 2 B 2003-1994 4. out under the condition ofno load
8、 as follows: Structural inspection The structural inspection of the valves shall be carried The handle shall be capable of being operated easily and the valve stem and disc shall be securely connected. The valve shall work smoothly when operated for opening and closing. In the globe and angle valves
9、, the disc and valve seat shall be concentric, and when the valve is closed, the disc shall be seated correctly on the valve seat. The gate valve shall be so constructed that the centre of valve seat face of disc is situated higher than the centre of valve seat face of valve body when the valve is c
10、ompletely closed and that any part of the disc does not stay in the bore of valve seat when the valve is full open. In the check valve, the disc shall be opened to the stopper fitted on cover or valve body, and shall return to the closed position by its own weight. In the cock, the direction of plug
11、 bore shall coincide with the groove mark. The plug shall be so assembled as to have a clearance sufficient for the wear of grinding faces or for regrinding. Dimensional insnection The dimensional insnection shall be carried out using the surface plate, verker caliper, dial gauge, etc. ai follows: (
12、1) Flanged end valve The flanged end valve shall be as given in the following: (a) The dimensional tolerances of the flange shall be in accordance with JIS B 2203. (b) The tolerances on the parallelism and perpendicularity of the both end flanges shall be in accordance with Fig. 1 and Table 1 . (c)
13、The tolerances on the face-to-face dimension shall be in accordance with JIS B 2002. (d) The dimensional tolerances on the bore shall be in accordance with JIS B 2001. Fig. 1. Parallelism and perpendicularity of flanges of flanged end valve Parallelism of flange of straight type Perpendicularity of
14、flange of angle type 5 I -,-,- JIS 862003 94 4933b08 0524609 751 Nominal size 3 B 2003-1994 Permissible value (a = el + e21 300 or over 100 or under 1 30 15 125 or over to and incl. 250 I 20 (2) Butt welding end valve following: The butt welding end valve shall be as given in the (a) The tolerances
15、on the face-to-face dimension shall be in accordance with JIS B 2002. (b) The dimensional tolerances on groove shape shall be as agreed between the parties concerned with delivery. (c) The permissible values on parallelism and perpendicularity of the groove face of the both end butt welding part sha
16、ll be as agreed between the parties concerned with delivery. (3) Threaded end valve ing: The threaded end valve shall be as given in the follow- (a) The pipe threads shall be inspected in accordance with JIS B 0253. In this case, the position of the gauge diameter shall be on the end face. (b) The t
17、olerances on the face-to-face dimension (in the case of end face machining) shall be in accordance with Fig. 2 and Table 2. (c) The permissible value of the coaxiality or perpendicularity between the thread axial lines of both ends shall be 2 mm in respect to the distance of 300 mm from the threaded
18、 end (see Fig. 2 . ) Fig. 2. Coaxiality and perpendicularity of thread axial line of threaded end valve Unit: mm Coaxiality of straight type Perpendicularity of angle type J I S B*2003 74 4733608 0524630 473 4 B 2003-1994 Table 2. Tolerances on face-to-face dimensions of threaded end valve Unit: mm
19、Tolerances I Nominal size I Straight type I Angle type 40 (1 l/2) or under I I1.0 I 10.8 50 (2) or over to and incl. 100 (4) I k1.5 I k0.8 (4) Others The permissible values of the eccentricity of circumference in the case ofbeing as cast, at the flange coupling part of the valve body and bonnet, sha
20、ll generally be as given in Table 3. Permissible values of eccentricity of circumference of flange at coupling part of valve body and bonnet Table 3. Unit: mm Nominal size I Permissible value 100 (4) or under r- 3 .O 125 or over to and incl. 250 I 4.0 300 or over to and incl. 600 I 6.0 6. the like a
21、s follows: (1) (2) (3) (4) (5) (6) (7) Visual inspection The castings shall be free from harmful cavities, casting fins, sand seizure, sand inclusion, scales, cracks, etc. both on inside and outside surfaces. The forgings shall be free from overlaps, necking bruise, etc. The machined surfaces shall
22、be free from harmful defects and shall be uni- formly finished. The valve seat faces shall be free from harmful cavities and other defects. The corners and nooks without designation of dimensions shall be appropri- ately chamfered, rounded and the like. The portion through which the fluid passes sha
23、ll have been finished appropri- ately and cleansed. The valve shall be correctly indicated in accordance with JIS B 2004. The visual inspection shall be carried out by naked eyes or 7. carried out in accordance with the respective material standards. However, for the materials of which qualities hav
24、e been ascertained, the material test may be omit- ted. Material inspection The inspection on the materials of the valve shall be I 8. Pressure inspections() Note (l) The valve for water works and the faucet shall not be subjected to the pressure inspection specified herein, but shall be in accordan
25、ce with the prescriptions of respective standards. -,-,- J I S B*2003 94 m 4933608 05246LL 30T m Nominal size 50 (2) or under 65 (2 l/2) or over to and incl. 200 250 or over 5 B 2003-1994 Test duration 15 60 180 General The pressure inspection of the valve shall be as given in the follow- The pressu
26、re inspection shall be carried out after assembling of the valve, However, when shell test is supposed to adversely affect the internal compo- nents of the valve, it shall be as agreed between the parties concerned with delivery. As to an oval body type gate valve which is liable to be deformed when
27、 it is subjected to the test pressure, it may be supported by a press or a stay bolt for preventing the deformation of its valve body due to the pressure. In this case, the fastening force of the press or stay bolt shall be to the extent not to cause deformation to the valve body. Before the complet
28、ion of the shell test, painting of valve or coating with mate- rials for stopping up leakage shall not be performed. However, the inside lining and the chemical anticorrosive treatment of non-pressure sealing prop- erty may be processed. In the case where a reinspection is required on the valve whic
29、h has passed the shell test and finished painting, it may be inspected without removal of paint- ing. Shell test -,-,- J I S B*i2003 94 4933608 0524bL2 246 Nominal size 50 (2) or under 65 (2 l/2) or over to and incl. 200 250 or over to and incl. 450 6 B 2003-1994 Test duration 15 30 60 8 . 2 . 3 No
30、leakage, oozing and the like shall be found from the surface and the like of the valve. However. in the case of the hvdraulic Judgement of test results test, when the leakage from the gland packing part is found, it shall be j&dged as agreed between the parties concerned with delivery. 8.3 Seat leak
31、age test 8.3.1 Hydraulic test In this test, apply the test pressure of 1.1 times the maxi- mum permissible pressure(2). In this case, expel the internal air in advance. Main- tain this test pressure for the time given in Table 5, and examine the presence of the water leakage of the ground surface an
32、d interior of valve. When any leakage is found on a valve to which a small leakage volume of water is permissible, maintain the test pressure succeedingly for a time enough to carry out the measurement of leakage volume of water. with the following depending on the type of the valve. Furthermore, th
33、e method to apply the test pressure shall be in accordance 500 or over I 120 Remarks 1. The value of Table 5 indicates the minimum value of test dura- tion after the test pressure has reached the specified pressure. The duration of Table 5 applies also to the ground surface leak- age test of the coc
34、k. 2. Y -,-,- J I S B*2003 94 m Y933608 0524633 382 m Test fluid 7 . B 2003-1994 Division - Rate 1 Rate 2 Rate 3 8.3.2 the pneumatic pressure may be used instead of hydraulic pressure, and the test shall be carried out in accordance with the case of hydraulic test as appropriate. The test pressure i
35、n this case shall be 0.59 MPa (6 kgf7cm2), and the check valve shall be tested without reducing the pressure as it stands. specified testing pressure and filling water into the side opposite to the pressured side. 8.3.3 The division and permissible volume of the seat leakage shall be given in Table
36、6. The judgement of the test results shall be specified by respective product standards on the basis of Table 6. Pneumatic pressure test In the seat leakage test, if particularly required, Furthermore, the test may be performed on the condition of applying the Division and permissible volume of leak
37、age and judgement of test results Table 6. Division and permissible volume of seat leakage Water Nominal size Nominal size To be free from leakage. 0.1 mm3/s x of valve 0.01 mm% x of valve Nominal size 0.3 mm3/s x of Nominal size 30 mm% x of valve I I I I Remarks 1. 2. For nominal size of the valve,
38、 the nominal size series A shall be used. The permissible volume of the leakage only applies when discharging to the atmosphere. 8.4 leakage of its portion shall be tested as required. Its method and the judgement of the results shall be as agreed between the parties concerned with delivery. Back se
39、at leakage test For that having the back seat, the presence of 9. Other inspections Other inspections such as steam inspection, nondestruc- tive inspection(), etc. shall be carried out when particularly specified by the purchaser. between the parties concerned with delivery. The methods of inspectio
40、n and the judgement of test results shall be as agreed Note ( 9 (i) Radiographic inspection (2) Magnetic particle inspection (3) Liquid penetrant inspection (4) Ultrasonic inspection The nondestructive inspections mentioned here are as follows: B 2003-1994 Edition 1 Japanese Text Established by Mini
41、ster of International Trade and Industry Date of Establishment: 1968-03-01 Date of Revision: 1994-11-01 Date of Public Notice in Official Gazette: Investigated by: 1994-11-01 Japanese Industrial Standards Committee Divisional Council on Machine Elements This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan O JSA, 1995 Printed in Tokyo by Hohbunsha Co., Ltd.