Instruction Manual
D103302X012
A81 Valve
January 2011
2
Table 1. Fisher A81 Valve Specifications
Specifications EN ASME
Valve Body Size DN 50, 80, 100, 150, 200, 250, and 300 NPS 2, 3, 4, 6, 8, 10, and 12
Pressure Rating PN 10 to 40 per EN 12516‐1 CL150 and 300 per ASME B16.34
Valve Body Materials
EN 1.0619 steel WCC steel
EN 1.4409 stainless steel CF3M (316L) stainless steel
CW2M
(1)
CW2M
(1)
M35‐2
(1)
M35‐2
(1)
Disk Materials
PTFE Seal
EN 1.4409 stainless steel CF3M stainless steel
CW2M CW2M
M35‐2 M35‐2
Metal or UHMWPE
Seal
Chrome‐plated EN 1.4409 Stainless Steel Chrome‐plated CF3M Stainless Steel
End Connections
Mates with raised‐face flanges
per EN 1092‐1
Mates with raised‐face flanges
per ASME B16.5
Valve Body Style Wafer (flangeless) and single flange with tapped holes
Face‐to‐Face Dimensions Meets MSS SP68, API 609, and EN 558 standards
Shutoff
PTFE or UHMWPE seal ring ‐ No visible leakage per MSS SP‐61
S31600 (316 SST) seal ring - 0.1 scfh per unit of NPS (NPS 6 valve = 0.6 scfh)
per MSS SP-61
Flow Direction
Standard (forward flow) is with the seal retainer facing upstream; reverse flow is permissible within specified
pressure drop limitations
Flow Characteristic Approximately linear
Disk Rotation
Counterclockwise to open (when viewed from actuator side of valve body) through 90 degrees of disk
rotation
1. This material is not listed in EN 12516-1 or ASME B16.34. See table 4 for pressure/temperature ratings.
Table 2. Valve Size, Shaft Diameter, and Approximate Weight
VALVE SIZE PRESSURE RATING SHAFT DIAMETER
APPROXIMATE WEIGHT
Wafer‐Style Single‐Flange
DN NPS EN ASME mm Inches kg Pounds kg Pounds
50 2 PN10‐40 CL150/300 12.7 1/2 4.7 10 6.7 15
80 3 PN10‐40 CL150/300 15.9 5/8 7.5 17 11.2 25
100 4 PN10‐40 CL150/300 19.1 3/4 12.5 28 17.6 39
150 6 PN10‐40 CL150/300 25.4 1 15.7 35 26.5 58
200 8
PN10‐16 CL150 31.8 1‐1/4 30.2 67 40.2 89
PN25‐40 CL300 31.8 1‐1/4 33.9 75 46.0 102
250 10
PN10‐16 CL150 31.8 1‐1/4 38.9 86 50.5 111
PN25‐40 CL300 31.8 1‐1/4 51.8 114 79.2 175
300 12
PN10‐16 CL150 38.1 1‐1/2 68.7 151 98.3 217
PN25‐40 CL300 38.1 1‐1/2 76.6 169 104.6 231
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