JIS-B-2003-1994-ENG.pdf
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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
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