<3.  INSTALLATION>
3-13
IM 01E30D01-01EN
3.3.4   Gaskets Size
Be sure to choose a gasket with an inner and outer 
diameter that does not protrude inside the piping.
If the inner diameter of the gasket is too large, 
orouterdiameterofthegasketistoosmall,uid
leakage may result.
Table 3.3.12  Inner Diameters of Grounding Ring, 
Outer Diameter for Effective Sealing, 
Recommended Inner Diameter of 
Gasket
Lay length code 1;  Unit: mm (in.)
Size
PFA lining
Wafer, Flange
Inner 
Diameter of 
Grounding 
Ring
[øA]
Outer  
Diameter  
for 
Effective 
Sealing
[øB]
Recommended Inner 
Diameter of Gasket
Flat  
Gasket
[øC]
PTFE-
sheathed 
Non- 
asbestos 
Gasket
[øD]
25 (1.0) 28 (1.10) 53 (2.09) 35 (1.38)
40 (1.5) 41 (1.61) 71 (2.80) 49 (1.93)
50 (2.0) 53 (2.09) 84 (3.31) 61 (2.40)
65 (2.5) 66 (2.60) 103 (4.06) 84 (3.31)
80 (3.0) 77 (3.03) 114 (4.49) 90 (3.54)
100 (4.0) 102 (4.02) 140 (5.51) 115 (4.53)
150 (6.0) 146.1 (5.75) 190 (7.48) 167 (6.57)
200 (8.0) 193.6 (7.62) 240 (9.45) 218 (8.58)
Lay length code 2;  Unit: mm (in.)
Size
PFA lining
Wafer
Inner 
Diameter of 
Grounding 
Ring
[øA]
Outer  
Diameter  
for 
Effective 
Sealing
[øB]
Recommended Inner 
Diameter of Gasket
Flat  
Gasket
[øC]
PTFE-
sheathed 
Non- 
asbestos 
Gasket
[øD]
25 (1.0) 28 (1.10) 53 (2.09) 35 (1.38)
40 (1.5) 41 (1.61) 71 (2.80) 49 (1.93)
50 (2.0) 53 (2.09) 84 (3.31) 61 (2.40)
65 (2.5) 66 (2.60) 103 (4.06) 84 (3.31)
80 (3.0) 77 (3.03) 114 (4.49) 90 (3.54)
100 (4.0) 102 (4.02) 140 (5.51) 115 (4.53)
150 (6.0) 140.7 (5.54) 190 (7.48) 167 (6.57)
200 (8.0) 188.9 (7.44) 240 (9.45) 218 (8.58)
F0311.ai
Lining
AXR
Flowtube
Grounding Ring
Flat Gasket
PTFE-sheathed Non-asbestos Gasket
Size of Inner Diameter of Grounding Ring, 
Outer Diameter for Effective Sealing and 
Recommended Inner Diameter of Gasket:
øCøD
øB
øA*1
*1: Do not have this length be smaller than the 
inner diameter of grounding ring (øA).