structural length and connecting flange

metal valve structure length

in China GB/T 12221 & ndash; 2005 standard for metal valve structure length changes adopted ISO 5752 & ndash; 1988 'metal valve flange pipe system structure length' international standards, with GB/T 12221 & ndash; Compared to 1989, increased the welding end clamp, internal thread, external thread length of the structure of the basic series and the length of the structure of all kinds of valves, more scientific and reasonable, can be in line with international standards, easy to use.

GB / T 12221 - 2005 version of the standard applies to the nominal pressure & le; DN3 ~ 4000 PN420, nominal size of gate valve, globe valve, ball valve, butterfly valve, plug valve, diaphragm valve, check valve and the length of the structure.

the valve structure as shown in figure 1 - length Figure 1-8 ~ 10. The structure of the valve length are shown in table 1 Table 1 73 ~ - 94.

figure 1 - Eight straight through the valve structure length

figure 1 - 9 Angle type valve structure length

figure 1 - 10 the length of the clip valve structure

in table 1 Series 73 length of flange connection valve structure basic units: mm

(1) the structure of the code series of Angle type valve length, did not note the Angle mark for straight-through

in table 1 74 straight through welding end valve structure length basic series units: mm

note: structure length limit deviation are shown in table 1 93.

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in table 1 75 Angle type welding end valve structure length basic series units: mm - in table 1 76 units connected to the clamp valve structure length basic series: mm

note: the dimension limit deviation DN≤ 900 for & plusmn; 2 mm, DN1000 ~

in table 1 77 female connection valve structure length basic series units: mm

note: 1. Suitable for straight-through type and the Angle of structure. 2. The tolerances of the structure length

in table 1 78 external thread connection Industrial Valves structure length basic series units: mm

note: the tolerances of the length of the structure for & plusmn; 1. 6 mm

in table 1 79 flange connection gate structure length units: mm

note: the boldface said in the table size is preferable. Table 1

80 the length of the clip knife gate valve structure units: mm

note: length of the structure for the tolerances of the & plusmn; 1. 6mm。 Table 1

81 welding side gate structure length units: mm

note: the structural length deviation are shown in table 1 93. Table 1

82 butterfly valve and butterfly valve structure length units: mm

note: the boldface said in the table size is preferable. Table 1

83 flange connection structure of ball valve and plug valve length units: mm

1) used for full size ball valve. (2) only applies to ball valves. Note: 1. Do not apply to the nominal

in table 1 Welding end ball valve structure length: 84 mm

- in table 1 85 welding end plug valve structure length units: mm - in table 1 86 flange connection cut-off valve, throttle valve and check valve structure length units: mm

(1) applies only to disc swing check valves. Table 1

87 welding end cut-through cut-off valve, throttle valve and check valve structure length units: mm

1. This value in different basic series, applies only to stop valve and check valve. Note: a table

in table 1 88 welding end Angle stop valve, throttle valve and check valve structure length units: mm

in table 1 89 connected to the clamp swing check valve structure length units: mm

in table 1 90 the length of the clip lift check valve structure units: mm

in table 1 91 flange connection structure of diaphragm valve length units: mm

note: the boldface said in the table size is preferable. Table 1

92 flange connection of copper alloy gate valve, globe valve and check valve structure length units: mm

in table 1 Flange connection valve structure length tolerance unit: 93 mm

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