Data Sheet

A31A Cryogenic Valve
Product Bulletin
21.1:Cryogenic-Rotary
October 2010
2
Specifications
Valve Body Sizes and Ratings
NPS J 3, J 4, J 6, J 8, J 10, and J 12
CL150 and 300
J NPS 14 through 24 valves are also available in
CL150 and 300.
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 CL150 or 300
Maximum Inlet Pressure/Temperature
(1)
Consistent with CL150 and CL300
pressure/temperature ratings per ASME B16.34,
except that 38_C (100_F) rating is applicable to
254_C (425_F). NOVEX seal maximum
pressure/temperature rating is the same as the
valve body. See figure 4 for rating of CTFE seal.
Temperature Range
(1)
234 to 260_C (425 to 500_F)
Available Seal Configurations
See figure 3 and table 2
Standard Construction Materials
Valve Body and Disc: ASTM grades of S31600
stainless steel
Disc Coating:Hardcoating Standard (Chrome or
Nickel)
Shaft: J ASTM grade of S17400 H1150M SST
,
J N05500 (Optional), J N07718 (Optional)
Seal Ring: J S31600 (316 SST) NOVEX Std for
CL 150, J S21800 NOVEX Std for CL300,
J CTFE
(2)
optional, or J CTFE
(2)
with Aluminum
Back-up ring optional
Packing: J PTFE V-ring, or J graphite (optional)
Bearings: J PTFE Composition, or J bronze
(optional)
Valve Body 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 CL150 or 300 raised-face flanges
Shutoff Classification
Unidirectional Reverse flow. Per ANSI/FCI 70-2 and
IEC 60534-4 at ambient temperature
NOVEX Seal: Class VI
CTFE Seal: 1/10 of Class IV
CTFE Seal with Aluminum back-up ring:
Class VI
Flow Characteristic
Modified equal percentage
Flow Coefficients
See the section titled Coefficients in this bulletin
Noise Levels
See Catalog 12 for sound pressure level
prediction
Available Actuators
J Rack and Pinion 1035 for NPS 3 through 12,
J Bettis G Series for keyed shaft
NPS 14 through 24 or
J Rotary Diaphragm 1051 and 1052 for splined
shafts
Disc Rotation
Clockwise to close
Valve Dimensions and Approximate Weights
See figures 6, 7, 8, 9, 10, 11, 12, and 13 and
tables 1, 3, 4, 5, 6, 7, 8, 9 and 10.
1. The pressure/temperature limits in this bulletin, and any application code or standard limitation, should not be exceeded.
2. CTFE not recommended for fast cycling, less than 2 seconds.
W7449
Figure 2. Fisher A31A Cryogenic Valve, Single Flange Style