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Instruction Manual

D103302X012

A81 Valve

May 2011

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

(4)

M35‐2

Disk Materials

PTFE or RPTFE

Seal

(3)

EN 1.4409 stainless steel CF3M stainless steel

CW2M CW2M

M35‐2 M35‐2

Metal or

UHMWPE

(2)

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 or through holes

Face‐to‐Face Dimensions Meets MSS SP68, API 609, and EN 558 standards

Shutoff

PTFE, RPTFE, 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.

2. UHMWPE stands for ultra high molecular weight polyethylene.

3. RPTFE is a reinforced PTFE seal.

4. This material is not listed in EN 12516-1. 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

Description

The A81 rotary valve with FieldQ rack‐and‐pinion actuator offers automated on‐off, quarter‐turn performance. FieldQ

is available in spring‐return and double‐acting piston designs.

The valve body meets PN 10 through PN 40, CL150, and CL300 ratings. Face‐to‐face dimensions meet EN 558, API

609, and MSS‐SP68 standards. Retainer clips provide for versatility to mount and align the same wafer style valve body

in different piping configurations (ASME and EN ratings).

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