ANSI FCI 70-2
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 ANSI FCI 70-2

ANSI FCI 70-2 supercedes ANSI B16.104 and specifies six different seat leakage classifications, Class I through Class VI.

Leakage Class Designation Maximum Leakage Allowable Test Medium Test Pressure & Temperature
Class I - Dust Tight x x x
Class II 0.5% of rated capacity at full travel Air / Water 50 psig or maximum differential pressure, whichever is lower. Temperature between 50-125°F (10-52°C)
Class III 0.1% of rated capacity of full travel Air / Water 50 psig or maximum differential pressure, whichever is lower. Temperature between 50-125°F (10-52°C)
Class IV - Metal to Metal 0.01% of rated capacity of full travel Air / Water 50 psig or maximum differential pressure, whichever is lower. Temperature between 50-125°F (10-52°C)
Class V 0.0005 ml per minute per inch of port diameter per psi differential Water Service DP at 50° to 125°F (10° to 52°C) As long as the maximum service pressure across valve does not exceed the ANSI body rating
Class VI - Bubble Tight Not to exceed amounts shown in the table below Air or Nitrogen Service DP at 50° to 125°F (10° to 52°C) As long as the maximum service pressure across valve does not exceed the ANSI body rating

Class VI Bubble Tight Leakage Rates

Port Size

(Inches)

Port Size

(mm)

Bubbles per Minute ml per Minute
1 25 1 0.15
1.5 38 2 0.3
2 51 3 0.45
2.5 64 4 0.6
3 76 6 0.9
4 102 11 1.7
6 152 27 4
8 203 45 6.75




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