MKS 253B-2-2-2 - Page 43

Appendix A: Product Specifications ASA Flan
g
e S
p
ecifications
35
ASA Flange Specifications (Continued)
Valve Type Number 253B-
4-4-2
253B-
6-4-2
253B-
6-6-2
253B-
8-6-2
253B-
8-8-2
253B-
10-10-2
Inside Diameter (A)*
Inches
(mm)
3.965
(100.7)
5.781
(146.8)
5.781
(146.8)
7.501
(190.5)
7.501
(190.5)
10.000
(254.0)
Mounting Flange
ASA 4” ASA 4” ASA 6” ASA 6” ASA 8” ASA 10”
Outside Diameter (B)*
Inches
(mm)
8.90
(226.1)
8.90
(226.1)
10.90
(276.9)
10.90
(276.9)
13.19
(335.0)
16.00
(406.4)
Controllable
Conductance (l/sec)
min
max
1.50
950
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
Closed Leakage
(Torr l/sec)
N/A N/A N/A N/A N/A N/A
Flapper Seal**
None None None None None None
Thickness (C)*
Inches
(mm)
0.88
(22.4)
0.88
(22.4)
0.94
(23.9)
0.94
(23.9)
0.94
(23.9)
0.94
(23.9)
Overall Height
Inches
(mm)
13.74
(349.0)
13.74
(349.0)
15.74
(399.8)
15.74
(399.8)
18.03
(458.0)
20.84
(529.3)
No. of Bolt Holes
8888812
Bolt Hole
Diameter (D)*
Inches
(mm)
0.75
(19.1)
0.75
(19.1)
0.88
(22.4)
0.88
(22.4)
0.88
(22.4)
1.00
(25.4)
Bolt Circle Diameter
Inches
(mm)
7.500
(190.9)
7.500
(190.9)
9.500
(241.3)
9.500
(241.3)
11.750
(298.5)
14.250
(362.0)
Flange O-ring groove
ID
In
(mm)
Parker
®
No. or
Size (JIS)
5.995
(152.3)
2-258
5.995
(152.3)
2-258
8.000
(203.2)
2-266
8.000
(203.2)
2-266
9.734
(247.2)
2-273
11.938
(303.2)
2-278
*
Refer to Figure 1, page 23.
** Where Viton is used, other materials are available; consult factory.