Reference Manual

1−23
Table 1-4. Control Valve Leakage Standards
ANSI
B16.104-1976
Maximum Leakage Test Medium Pressure and Temperature
Class II 0.5% valve capacity at full travel Air
Service ΔP or 50 psid (3.4 bar differential),
whichever is lower, at 50_ or 125_F (10_ to 52_C)
Class III 0.1% valve capacity at full travel Air
Service ΔP or 50 psid (3.4 bar differential),
whichever is lower, at 50_ or 125_F (10_ to 52_C)
Class IV 0.01% valve capacity at full travel Air
Service ΔP or 50 psid (3.4 bar differential),
whichever is lower, at 50_ or 125_F (10_ to 52_C)
Class V
5 x 10
-4
mL/min/psid/inch port dia. (5
x 10
-12
m
3
/sec/Δbar/mm port dia)
Water
Service ΔP at 50_ or 125_F (10_ to 52_C)
Class VI
Nominal Port
Diameter
Bubbles per
Minute
mL per Minute
Test
Medium
Pressure and Temperature
In
1
1-1/2
2
2-1/2
3
4
6
8
mm
25
38
51
64
76
102
152
203
1
2
3
4
6
11
27
45
0.15
0.30
0.45
0.60
0.90
1.70
4.00
6.75
Air
Service ΔP or 50 psid (3.4 bar
differential), whichever is lower, at 50_
or 125_F (10_ to 52_C)
Copyright 1976 Fluid Controls Institute, Inc. Reprinted with permission.