Type A31A
2
Table 1. Specifications
Available Valve Configurations
J
Flangeless, wafer-style or
J
single-flange
(lugged) control valve with a one-piece valve body
and a two-component seal/backup O-ring, and a
keyed drive shaft
Valve Sizes
J
3,
J
4,
J
6,
J
8,
J
10,
J
12-inch
End Connection Style
J
Flangeless, wafer-style or
J
single flange valve
body designed to fit between raised-face mating
flanges per ASME B16.5 Class 150 or 300
Maximum Inlet Pressure/Temperature
(4)
Consistent with ANSI Class
J
150 and
J
300 pres-
sure/temperature ratings per ASME B16.34. Also,
see figure 2 for additional information.
Available Seal Configurations
J
Standard soft seal ring (PTFE) with fluoroelas-
tomer or EPR backup ring,
J
NOVEX
t
seal ring,
Class 150, (S31600, 316 SST)
(1)
J
NOVEX seal
ring, Class 300, standard pressure rating (S31600,
316 SST)
(1)
J
NOVEX seal ring, Class 300, high
pressure rating (S21800, Nitronic 60),
J
Phoenix
R
III fire-tested seal ring (S31600, 316 SST) with resil-
ient insert (PTFE) and backup ring (fluoroelastom-
er), or
J
cryogenic seal ring (Kel-F) with optional
backup ring (aluminum)
Valve Classification
Face-to-face dimensions are in compliance with
MSS SP68 and API 609 standards; valve bodies
are designed for installation between ASME B16.5
Class 150 or 300 raised-face flanges
Shutoff Classification. Per ANSI/FCI 70-2
Standard Soft Seal: Bidirectional bubble-tight shut-
off
NOVEX Seal: Unidirectional shutoff Class V (re-
verse flow direction only)
Phoenix III Seal: Bidirectional bubble-tight shutoff
Phoenix III Seal for Fire-Tested Applications:
Consult your Fisher Controls sales office or repre-
sentative for fire tested performance
Cryogenic seal applications: Consult your Fisher
Controls sales office or sales representative
Installed Valve Orientation
See figure 3 for orientation guidelines for optimum
seal performance
Valve In-Line Position
Shaft horizontal. See figure 5
Available Actuators
J
Handlever,
J
handwheel,
J
spring-and-dia-
phragm, or
J
pneumatic piston
Disk Rotation
Clockwise to close
1. For specific information about materials of construction, contact your nearest Fisher Controls sales office or representative.
2. The pressure/temperature limits in this manual, and any applicable code or standard limitation, should not be exceeded.
The Type A31A is available in either a flangeless (wa-
fer) or a single-flange (lugged) valve design, with a
variety of seal, valve body, and internal components.
The Type A31A valve features a patented, dynamic
sealing design that is used in a variety of demanding
applications. With the appropriate seal configuration
and materials of construction, the pressure-assisted
seal provides shutoff against the full ANSI class pres-
sure range for the specific valve type.
Installation
WARNING
To avoid personal injury or property
damage resulting from the sudden re-
lease of pressure, do not install the
valve assembly where service condi-
tions could exceed the limits given in
this manual or on appropriate name-
plates. Use pressure-relieving devices
as required by government or accepted
industry codes and good engineering
practices.
