North American Control Valves Data on Leakage
Sheet 1000-3
The table below lists leak rates through various models and sizes of Adjustable Port Valves in the overlap closed position and Butterfly and Wafer Valves in the full closed position.
Wide variations in observed leak rates are due to machining tolerances and amount of lubricant (where used) on valve internals. Curtain position of Adjustable Port Valves dœs not affect leakage. Because leakage varies from one valve to another, exercise caution when using this data to determine leakage for valve sizes and pressure drops other than those shown.
Valve Designation
Pressure,
and Pipe Size
Fluid
osi
Leak Rate, cfh
1008A or 1010A-1 (1") 1008A or 1010A-3 (1 ½ ") 1008A or 1010A-7 (4") 1008A or 1010A-01 ( ½ ") 1008A or 1010A-01 ( ½ ")
nat’l gas nat’l gas nat’l gas nat’l gas comp. air
8 8 8 8
6.5-14
19
less than 4 less than 4 less than 30
320 (20 psi)
1004-3-B (1 ½ ")
air
20
140 past shaft only 405 past port only 90-115 past shaft only 145-475 past port only 20-25 past shaft only 370-900 past port only 10 past shaft only 1910 past port only 50 past shaft only 3520 past port only
1004-6-C (3")
air
28
1004-6-D (3")
air
27
1004-8-E (6")
air
20
1004-9-F (8")
air
20
1122 or 1124-4 (2")
air air air air air
24 24 24 24 24 26
25
1126-1 (1") 1126-3 (1 ½ ") 1126-4 (2") 1126-7 (4")
160 334
564-670 1125-1565 213-236
1136-7 (4")
air
24
645
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