Expansion Joints

NK-7300・NK-7300E

Expansion joint for Exhaust gas

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Feature

This product is non welding. Production of short face-to-face can be a structure in which to flare the flange end face the bellows.
Applicable fluid: Exhaust gas Air Low pressure steam Water
Applicable bellows: iO, E
Material: SUS304 SUS316L SUS310S
*Please contact us for material.
Standard：JIS, ANSI, DIN

NK-7300

Materials

Bellows Stainless Steel
Inner Sleeve Stainless Steel
Flange Carbon steel, Stainless Steel
Shipping Bolt Carbon steel, Stainless Steel
Holder Carbon steel, Stainless Steel

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Bellows for NK-7300 iO Bellows

DN Bellows Size(mm) Production possible Convolution Spring Rate(N/mm) Expansion / contraction amount per Convolution(mm) Effective cross section(㎟)
Thickness Convolution Height Pitch ID
20 0.3 4.7 6.0 27.0 32 1352.8 0.45 819.4
25 0.3 5.5 6.3 33.5 32 1092.6 0.55 1228.5
32 0.3 6.7 7.0 42.0 32 787.9 0.75 1908.9
40 0.35 6.9 7.5 47.5 32 1255.1 0.75 2384.5
50 0.35 7.4 8.5 59.5 32 1214.4 0.90 3589.1
65 0.4 9.6 9.5 75.0 25 1130.0 1.20 5728.0
80 0.4 10.6 10.5 88.0 25 976.6 1.40 7760.0
100 0.4 10.6 10.5 113.0 25 888.5 1.60 12449.2
125 0.5 11.0 12.0 138.0 38 4941.2 1.40 17671.5
150 0.5 13.0 15.0 164.0 30 3450.5 1.80 24884.6
200 0.5 13.0 15.0 216.0 30 2216.8 1.80 41547.6
250 0.5 16.0 18.0 268.0 25 1492.2 2.70 63794.0
300 0.5 18.0 20.0 317.0 22 1243.2 3.50 88668.3
350 0.6 18.0 20.0 356.0 22 2398.9 3.00 110564.5
400 0.6 23.0 25.0 406.0 17 1333.0 4.70 145355.2
450 0.6 23.0 25.0 456.0 17 2983.2 4.70 181106.6
500 0.6 23.0 25.0 507.0 14 1645.9 5.90 225978.7
550 0.8 32.0 35.0 558.0 12 1803.9 7.80 270992.8
600 0.8 32.0 35.0 609.0 12 1747.0 7.80 320092.6
650 0.8 32.0 35.0 660.0 12 1885.6 7.80 377622.2
700 0.8 32.0 35.0 710.0 12 2021.6 7.00 434278.8
750 0.8 32.0 35.0 762.0 12 2162.9 7.00 497140.8
800 0.8 36.0 40.0 812.0 9 1609.5 8.70 566916.2
850 0.8 36.0 40.0 864.0 9 1708.0 8.70 638436.5
900 0.8 36.0 40.0 914.0 9 1802.7 8.70 711211.5
1000 0.8 40.0 45.0 1015.0 8 1450.2 10.50 876821.3
1100 0.8 40.0 45.0 1117.6 8 1590.9 10.50 1055374.6
1200 0.8 40.0 45.0 1219.2 8 1730.4 10.50 1248482.0
1350 0.8 40.0 45.0 1371.6 8 1939.6 10.50 1568545.6
1500 0.8 40.0 45.0 1524.0 8 2148.7 10.50 1925092.1

Bellows for NK-7300E E Bellows

Nominal diameter Thickness(mm) ID(mm) Convolution Height(mm) Pitch(mm) Expansion / contraction amount per Convolution(mm) Spring Rate(N/mm)
20 0.2 28.6 4.7 4.0 0.60 373.3
25 0.2 35.6 5.5 4.0 0.75 310.3
32 0.2 44.1 6.7 5.0 1.10 209.1
40 0.2 50.1 6.9 5.0 1.15 217.8
50 0.2 62.1 7.4 5.0 1.25 222.6
65 0.2 78.4 9.0 6.5 1.85 150.3
80 0.3 90.9 10.0 6.5 1.55 450.4
100 0.3 116.2 10.0 7.5 1.65 524.3
125 0.3 141.9 10.0 7.5 1.65 630.6
150 0.3 167.4 11.0 7.5 1.90 583.3
200 0.3 218.7 11.0 7.5 1.90 750.5
250 0.3 270.4 13.0 10.0 2.70 527.8
300 0.3 319.9 13.0 10.0 2.70 619.8
350 0.4 356.0 15.0 13.0 2.70 1268.0

The drawing can be downloaded from the link below.

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