Description: Allowable leakage as agreed between Contractor and Manufacturer; A modification of any Class II, III or IV valve where design intent is the same as the basic class, but by agreement between user and supplier, no test is required.
Synonyms: CFIHOS-60001707
Class II
Description: No more leakage than 0.5 % of rated flow capacity; 0.5% of rated valve capacity
Synonyms: CFIHOS-60001708
Class III
Description: No more leakage than 0.1 % of rated flow capacity; 0.1% of rated valve capacity
Synonyms: CFIHOS-60001709
Class IV
Description: No more leakage than 0.01 % of rated flow capacity; 0.01% of rated valve capacity
Synonyms: CFIHOS-60001710
Class V
Description: No more leakage than 10.8 x 10-6 x D Nm3/h (D is the seat diameter in mm);See Table 1 of ANSI B16.104/FCI 70-2
Synonyms: CFIHOS-60001711
Class VI
Description: For values, refer to IEC 60534-4 Table 3; Leakage per Paragraph 5.4.4 of ANSI B16.104/FCI 70-2 as expressed in ml per minute versus seat diameter
Synonyms: CFIHOS-60001712
Value
Description
Synonyms
Class I
Allowable leakage as agreed between Contractor and Manufacturer; A modification of any Class II, III or IV valve where design intent is the same as the basic class, but by agreement between user and supplier, no test is required.
CFIHOS-60001707
Class II
No more leakage than 0.5 % of rated flow capacity; 0.5% of rated valve capacity
CFIHOS-60001708
Class III
No more leakage than 0.1 % of rated flow capacity; 0.1% of rated valve capacity
CFIHOS-60001709
Class IV
No more leakage than 0.01 % of rated flow capacity; 0.01% of rated valve capacity
CFIHOS-60001710
Class V
No more leakage than 10.8 x 10-6 x D Nm3/h (D is the seat diameter in mm);See Table 1 of ANSI B16.104/FCI 70-2
CFIHOS-60001711
Class VI
For values, refer to IEC 60534-4 Table 3; Leakage per Paragraph 5.4.4 of ANSI B16.104/FCI 70-2 as expressed in ml per minute versus seat diameter
Description: Is the quantity of fluid passing through a valve when the valve is in its fully closed position at a specified process design pressure differential and temperature
Is the quantity of fluid passing through a valve when the valve is in its fully closed position at a specified process design pressure differential and temperature
