Farris Engineering 27DA23-M20 - Appendix A; Critical Seat and Disc Dimensions

Appendix A
Critical Seat and Disc Dimensions
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Use these dimensions when lapping and/or refacing is required. Parts must be replaced if the minimum dimen-
sion is reached as indicated in the drawings.
General Notes:
1. All dimensions are in inches.
2. Minimum dimension for body applies to both metal and O-ring seat designs.
ORIFICE SIZE A B
1/2 x 1
C 3/4 x 1 0.344 0.985
1 x 1
C 1/2 x 1
(High 3/4 x 1 0.344 0.985
Pressure) 1 x 1
1/2 x 1
D 3/4 x 1 0.344 0.985
1 x 1
D 1/2 x 1
(High 3/4 x 1 0.344 0.985
Pressure) 1 x 1
E1 x 1 1/2 0.363 0.821
F 1 1/2 x 2 0.734 0.950
G 1 1/2 x 2 1/2 0.738 0.910
B
A
DISC
BODY
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Visit www.boighill.com to request a quote.