User's Manual

Component Descriptions
September 2013 2-44 P/N 81-CO2MAN-001
Figure 2-49. Check Valves (1-1/2-inch to 2-inch)
2-4.3 Check Valves (2 1/2-inch through 3-inch)
The 3-inch check valve, Part No. 81-870100-000 (Figure 2-50) is similar in construction and
operation to the 1 1/2-inch and 2-inch check valves.
This valve has flanged inlet and outlet ports and requires two appropriately sized welding neck
flanges and gaskets for connection to either 2 1/2-inch or 3-inch distribution piping.
Table 2-19. Check Valve Dimensions (1-1/2-inch through 2-inch)
Part Number Valve Size
Pipe Thread
“D”
“A” “B” “C”
in. mm in. mm in. mm
81-870152-000 1-1/2 in. 1-1/2 in. - 11.5 NPT 7.50 151 6.28 160 4.75 121
81-870151-000 2 in. 2 in. - 11.5 NPT 7.50 151 6.28 160 4.75 121
A
C
D
B
VALVE MUST BE
INSTALLED WITH
ARROW POINTING IN
DIRECTION OF FLOW